Title of Invention: METHOD FOR QUICKLY SUPPLYING ELECTRIC ENERGY TO ELECTRIC VEHICLE AND POWER SUPPLY DEVICE THEREOF Abstract: A method of quickly supplying electric energy to electric vehicles and the power supply device thereof are provided. The method includes providing a rechargeable battery pack on an electric vehicle and providing a battery replacement device, a charging room and a battery storeroom in a power exchange station. The rechargeable battery pack includes a battery box and standardized standard battery units. The standard battery units are located in the battery box during operation, and are capable of being smoothly loaded into and unloaded from the battery box along the guiding rails. The rechargeable battery pack is pre-installed in the electric vehicle; and the drained standard battery units within the battery box are replaced with fully-charged standard battery units upon payment when the electric vehicle in need of electric power supply is driven into the power exchanging station. Detailed Description: TECHNICAL FIELD The invention belongs to transportation area and relates to energy supply to electric vehicles, in particular to a method for quickly supplying electric energy to electric vehicle and power supply device thereof. BACKGROUND With the progress of science and technology as well as development of economies, living and working spaces of human-beings are constantly expanding, making various vehicles indispensable to daily commutes. In the past, energy sources of vehicles mainly compose of petroleum products and all kinds of gases. However, with diminishing petroleum and gas resources and worsening of noise contaminations, atmosphere contaminations as well as global warming, it becomes a consensus to people to develop and utilize eco-friendly alternative energy resources and decrease CO2 emissions. In this context, electric energy is widely used in power supply of vehicles as an eco-friendly, highly efficient and reliable energy. Electrical vehicles such as various electric bicycles, electric cars and buses, and trolleys are increasingly popular in future development of transportation vehicles. A common problem for electric-only vehicles powered by rechargeable batteries is that, unlike various petroleum/gas products that may be quickly supplied in fuel stations, it usually takes a few hours to recharge a typical battery for vehicle use, which significantly limits the popularization of electric vehicles. In order to solve the above problem, a method of quickly replacing large size storage battery packs and the device thereof are disclosed in the application No. 200810006771.6. According to this disclosure, so-called high voltage battery packs or full-voltage battery packs are typically used as replacement units. The battery packs are of large weights and volumes in order to facilitate replacement. The inner spaces of the electric vehicles vary greatly from one to another as of the different geometries of electric vehicles of different models or brands. It is since difficult to standardize the models and specifications of the batteries when employing high voltage storage batteries of large sizes. Consequently, it is impossible to cover most of the vehicle models available in the market with a limited number of battery models. Furthermore, the storage battery packs of different geometries and sizes increases the difficulty of building electric energy supplement stations similar to fuel stations. It then becomes extremely difficult to quickly supply electric energy to various electric vehicles by replacing storage batteries, which in turn limits the popularization of the electric vehicles by a further step. Currently, researches on related technologies still focus on how to recharge the large size storage batteries quickly, but a charging time of around 10-20 minutes is expected even in a quick charge mode. As a result, a large amount of spaces are needed to charge a large number of vehicles simultaneously, which obviously hurdles the construction of energy supply stations similar to fuel stations in a broader scale that is required for popularization of electric vehicles. In addition, safety cautions in aspects such as storage, applications and the like are required at a high level for employing storage batteries of high voltage and large capacity, which to some extent increases the operation costs. There are urban wired electric vehicles equipped with supporting pantograph systems to supply electric energy, however, as the construction of pantograph systems not only takes a significant amount of urban spaces, but also bring in various problems including defacing urban views and increasing operation costs, the outlook of such systems is thus not optimistic. SUMMARY The object of the present invention is to overcome the above mentioned disadvantages by providing a method of quickly supplying electric energy to electric vehicles applicable to quick replacement of rechargeable batteries of battery packs of various electric vehicles available in the market without supporting pantograph systems. The method of quickly supplying electric energy to electric vehicles according to the present invention comprises the following steps: providing a rechargeable battery pack on an electric vehicle; providing a battery replacement device, a charging room and a battery storeroom in a power exchange station; wherein the rechargeable battery pack comprises a battery box and standardized standard battery units, with the model, size and shape of the standard battery units being applicable to the differently-shaped battery boxes of most of the electric vehicles available in market, and the only differences between the standard battery units of the battery boxes of the electric vehicles of different models being in models, and/or number and/or battery arrangements of the standard battery units, and/or serial and/or parallel connections between the battery units; at least one battery chamber accommodating standard battery units is provided in the battery box, guiding rails being provided in the battery chamber along the battery loading direction, multiple docks for accommodating standard battery units are provided in the battery chamber along the battery loading direction; the standard battery units are located in the battery box during operation, and may be smoothly loaded into and unloaded from the battery box along the guiding rails; the electrodes of the standard battery units are provided on the sides of the loading direction and contact the electrode contact rails when the standard battery units are mounted in the proper position; the electrode contact rails are connected via fixed serial and/or parallel circuits; the battery pack may reach the nominal voltage of the battery pack and the capacity of the battery pack as needed upon properly mounting of all the fully charged standard battery units; the said rechargeable battery pack is pre-installed in the electric vehicle, and the drained standard battery units within the battery box are replaced with fully-charged standard battery units upon payment when the electric vehicle in need of electric power supply is driven into the power exchanging station. Typically, the method of quickly supplying electric energy to electric vehicles according to the present invention comprises the following steps: 1) the electric vehicle is driven into the power exchange dock of the power exchange station; the driver orders standard battery units to be replaced according to model and number of the standard battery units needed. The battery box is switched to a replacement state, releasing the positional locking of the standard battery units within the battery box; 2) the drained standard battery units within the battery box of the electric vehicles needed to be replaced are replaced with fully-charged standard battery units using the battery replacement device, according to the ordered number of the batteries; 3) the model, number and price of the standard battery units being loaded are displayed on the battery replacement device synchronously; 4) after replacement of the drained standard battery units within the battery box, the battery replacement device is moved away, and the standard battery units in the battery pack are locked again, the electric power supply to the electric vehicle is since completed; 5) the standard battery units are in proper contact with the electrode contact rails upon entering and positioning of all the standard battery units in the battery box, and a battery pack nominal voltage and a battery pack capacity required are achieved through serial and/or parallel combinations fixedly provided between the electrode contact rails; 6) during the above period, the driver pays for the batteries according to the ordered number of the batteries to be replaced or the driver pays according to the actual number of the replaced batteries displayed; 7) the drained standard battery units replaced are transferred to the charging room for recharging, and the fully-charged standard battery units are transferred to the battery storeroom for further use. When the method of quickly supplying electric energy to electric vehicles according to the present invention is used, a battery replacement device is employed to replace the drained standard battery units required to be replaced within the battery box of the electric vehicle with fully charged standard battery units. The process may be conducted specifically as described below depending on the different structures of the battery box: (1) In case that an inlet for standard battery units is provided on one end of the battery chamber within the battery box, and an outlet for standard battery units is provided on the other end of the battery chamber: the feeding port of the battery replacement device is docked to the inlet of the battery chamber of the electric vehicles after releasing of the positional locking of the standard battery units within the battery box; the battery replacement device is started to load the fully-charged standard battery units one by one through the inlet of the battery chamber according to the ordered model and number of the standard battery units meanwhile unloading the drained standard battery units within the battery chamber through the outlet of the battery chamber one by one; for the battery box with multiple battery chambers, standard battery units in these battery chambers may be loaded and unloaded simultaneously to increase the efficiency; (2) in case that only one common inlet and outlet port for loading and unloading the standard battery units is provided in one and the same battery chamber of the battery box, the recovery port of the battery replacement device is docked to the inlet and outlet port of the battery chamber of the battery box after releasing of the positional locking of the standard battery units within the battery box; the standard battery units within the battery chamber are unloaded through the inlet and outlet port of the battery chamber one by one; and then, the feeding port of the battery replacement device is docked to the inlet and outlet port of the battery chamber, the fully-charged standard battery units are loaded one by one through the inlet and outlet port of the battery chamber according to the ordered model and number of the standard battery units; similarly, standard battery units in multiple battery chambers may be loaded and unloaded simultaneously to increase the efficiency when the battery box is provided with multiple battery chambers. According to the method of the present invention, various available batteries including lead-acid storage battery, lead acid gel battery, metal hydride/nickel battery, lithium-ion battery or iron oxide lithium battery etc. may be used to provide power to electric vehicles, therefore, the said standard battery units may be any of the above mentioned rechargeable elementary battery unit. When used herein, the term “elementary battery unit” refers to individual battery units that may not be disassembled any further. Preferentially, shapes of the elementary battery units may be rectangular or cylindrical to facilitate manufacturing and arrangement in combination, of course it may be of any other shape. In addition to use the standardized available rechargeable batteries as standard battery units directly, in order to maintain effective contacts between the electrodes of the standard battery units and the electrode contact rails during operation, the second object of the present invention is to provide a standard battery unit applicable to the method of quickly supplying electric energy to electric vehicles according to the present invention, the standard battery unit comprising an elementary battery unit, wherein an elastic extension structure made of a metal spring or an elastic material is provided on the electrode of the elementary battery unit, the elastic material including rubber or elastic polyurethane material etc. Furthermore, in addition to application using elementary battery units directly, in order to increase the efficiency and facilitate replacement and application, the third object of the present invention is to provide another standard battery unit applicable to the method of quickly supplying electric energy to electric vehicles according to the present invention, the said standard battery unit comprising a plurality of elementary battery units connected in series or in parallel and disposed in a standard enclosure not to be disassembled during operation, wherein electrodes are provided on the standard enclosure. In order to facilitate connecting with external circuits, the electrode of said standard battery unit may also be provided with an elastic extension structure made of a metal spring or an elastic material, wherein the elastic material includes rubber or elastic polyurethane material etc. The shape of the standard enclosure may be preferentially provided as rectangular or cylindrical. In addition, the application procedure is within the life span of the battery under typical operation. The technical solution employing the standard enclosure facilitates ease battery replacement and may be more practical considering the voltage, capacity as well as weight and size of the battery. It may be easier to be disposed in a complex-shaped battery box compared to the full voltage large size batteries, thereby fully utilizing the spaces available in the electric vehicles; it may also be beneficial to further decrease the electric energy charging time of the electric vehicles compared to the elementary battery unit. The electrode of the standard battery unit according to the present invention is provided on the side of the loading direction of the standard battery unit. Other than providing the electrodes of the standard battery unit on one and the same end, the positive and the negative electrodes of the standard battery unit may be provided on two ends of the standard battery unit respectively, making the positive and the negative electrodes protrude from the respective end faces of the standard battery unit, which furthermore facilitates the effective connection between the standard battery unit and the external power supplying circuit. In addition, in order to prevent the accidental damages by external impacts, an elastic cushion pad layer may be provided on the corner or protrusion of the standard battery unit according to the present invention. In addition, a wear-resistant pad layer is provided at the position of the standard battery unit according to the present invention corresponding to the guiding rails of the battery box in order to be used in the method of quickly supplying electric energy to electric vehicles according to the present invention, such that the direct wear applied to the standard battery unit by the guide rails is mitigated, preventing the standard battery unit from being damaged due to excess wear during repeated loading and unloading procedures, thereby increasing the life span of the products. The fourth object of the present invention is to provide a battery box applicable to the method of quickly supplying electric energy to electric vehicles and various standard battery units according to the present invention, comprising a battery box body, at least one battery chamber capable of accommodating a plurality of standard battery units being arranged in the battery box body, with guiding rails provided in the battery chamber along the battery loading direction and a plurality of docks for standard battery units provided in the battery chamber along the battery loading direction. A battery locating mechanism is provided in the battery box, and electrode contact rails directly contacting electrodes of the standard battery units are provided in the battery chamber on the sides of battery loading direction, with the electrode contact rails comprising an anode contact rail and a cathode contact rail, and at least one anode contact rail and at least one cathode contact rail being provided with or connected to an output port for connecting with the external circuit respectively. The output port may be of various forms, such as a plug socket, a plug or a wire etc. In the case with the provision of a plurality of anode contact rails and/or cathode contact rails, the rails may be connected with each other via fixed serial and/or parallel circuits. It has to be pointed out that the serial and/or parallel circuit refers to any of a serial circuit, a parallel circuit or a serial and parallel circuit. It also has to be explained that, despite the fact that various currently available batteries may be directly used as standard battery units in the battery box of the present invention, standard battery units mentioned above in connection with the second and the third objects of the present invention may also be used. Therefore, unless otherwise stated, the standard battery units herein is a general term covering both the standard battery units comprising the currently available batteries and the standard battery units of the second and the third objects of the present invention. For the purpose of simplicity, in the following description, sometimes “batteries” are used to describe the standard battery units comprising the currently available batteries and those of the second and the third objects of the present invention collectively. Based on actual needs, an inlet for standard battery units may be provided on one end of each of the battery chambers of the battery box of the present invention, and an output for standard battery units may be provided on the other end; or, only one common inlet and outlet port for both loading and unloading the standard battery units may be provided for one and the same battery chamber within the battery box. In addition, in order to prevent for accidental dropping of the batteries during operation or invasion of water or other foreign matters, an openable protection cover may be provided at the inlet, the outlet or the inlet and outlet port of the battery chamber. The protection cover and the battery box body may be connected with fasteners, or with bayonet means, hinge means, locking means or threads. In order to prevent invasion of water or foreign matters into the battery chamber causing failures such as shorts or openings of circuits, sealing elements or sealing structures may be provided between the protection cover and the battery chamber body if necessary, with the sealing elements comprising sealing covers, sealing pads, sealing rings or sealing strips etc. and the sealing structures comprising bayonet structures etc. The electrode contact rail of the battery box of the present invention is provided on the side of the battery loading direction, at the positions corresponding to the battery electrodes. The battery electrodes are in proper connection with the electrode contact rails when the standard battery units are disposed in position, the serial connection and/or parallel connection of the electrode contact rails are pre-determined and fixed and ready for the battery units, the desired battery pack voltage and the battery pack capacity may be achieved when the batteries are disposed in position properly. The electrode contact rail within the battery box of the present invention is provided in various forms, by way of example, at least one electrode contact rail within each of the battery chambers may be made of a good conductor with flexural resilience in the direction of contacting with the battery electrodes, and connected to the battery box body with an elastic material even more softer than that of the good conductor, an insulate material layer may also be provided between the electrode contact rail and the battery box body when desired; or, at least one electrode contact rail within each of the battery chambers is made of a relatively rigid good conductor and an elastic element is provided between the electrode contact rail and the battery box body, an insulate material layer may also be additionally provided between the electrode contact rail and the battery box body when desired; otherwise, the electrode contact rail may move or rotate relative to the battery electrode, i.e., the electrode contact rail is not arranged fixedly, but maintained in contact or separate with the battery electrodes as desired. A proper voltage or total electric energy capacity may be achieved by controlling the number of the batteries provided in the battery box or serial or parallel connections and the combination thereof between the batteries, depending on the different models and loads of the electric vehicles. In order to achieve this goal, the anode contacts and the cathode contacts within the battery box may be provided in segments correspondingly, the serial connection and/or parallel connection between various batteries may be achieved by arranging the connections of the segments of the electrode contacts differently. In such way, the anode contacts and the cathode contacts in segments may form battery sub-packs, a proper voltage and electric energy capacity may be achieved by the combination of the serial and/or the parallel connections between the battery sub-packs. The guiding rail of the present invention may be a slide guiding rail or a rolling guiding rail. A typical rolling guiding rail comprises rollers, or comprises rollers and a guiding conveyor belt, or of course any other type of rolling guiding rails. The slide guiding rail is also of various types, it may be a guiding strip fixed within the battery chamber, or concave-convex guiding structures provided on the side wall of the battery box body. Same functions may be realized as long as position limiting and guiding of the batteries are enabled. In order to prevent shocks to batteries due to bumping in vehicle traveling, thus causing loosening arcs or damages to batteries, an elastic cushion vibration-absorption pad layer may be provided between the guiding rail and the battery box body, the pad layer may be made of elastic materials such as rubber, elastic foaming material or elastic polyurethane material. Without affecting the function of absorbing vibrations, adverse effects on the heat dissipation of the batteries when applying such technical solution can be avoided if the elastic cushion pad layers are not arranged on corners or other protrusions of the standard battery units of the present invention. In order to facilitate battery loading into or unloading from the battery box, a driving mechanism for loading and unloading the battery is provided in the battery box of the present invention. The loading and unloading driving mechanism may comprise a control system, a driving motor, a deceleration device and a transmission device, the transmission device being in form of a belt drive mechanism, a sprocket drive mechanism, a rack-pinion drive mechanism, a worm-gear drive mechanism or a ball screw drive mechanism; the loading and unloading driving mechanism may also comprise a control system, a control valve and a cylinder or hydraulic tank. In order to easily locate the batteries within the battery box and prevent the batteries within the battery box from moving or displacing unintentionally, a battery locating mechanism is provided in the battery box of the present invention. The battery locating mechanism is a mobile stop that may protrude into and retract from the battery chamber. The mobile stop may be controlled to protrude into or retract from the battery chamber at any time to positionally lock or unlock the standard battery units within the battery chamber. In such way, locking the battery position within the battery box may be enabled in cooperation with other structures such as the guiding rails. In addition, in order to prevent the adverse effects of reversing the anode and the cathode of the standard battery units during loading, an automatic identification error-proof device of the electrodes of the standard battery units is provided in the battery chamber within the battery box. The automatic identification error-proof device may be in various forms, including a different sized chamber structure design of battery box body for different sized electrodes, a protrusion or pin structure operated in cooperation with recesses on the standard battery units and fixed within the battery chamber, or a baffle with holes shaped to fit the specific appearances of the electrodes and provided at the inlet or the inlet and outlet port of the battery chamber. A cooling system is provided around the battery box or within the battery box, to ensure timely dissipation of heat generated by batteries within the battery box during operation, preventing damages to the batteries, battery box or other related devices due to high temperature. The cooling system may be an air cooling channel with an air inlet and an air outlet, an replaceable or cleanable filter is provided on the air inlet, and ventilation sub-channels are provided around the batteries and connected to the external air via the air cooling channel, an air blower may be provided in the air cooling channel to obtain a forcible ventilation, or a dynamic pressure air collecting port using pneumatic pressure from vehicle traveling as the air flow driving force may be provided at the air inlet of the air cooling channel. The cooling system may also be a circulating heat dissipation pipeline, comprising a heat absorption part, a heat dissipation part, a circulating link conduit and a power circulating pump, wherein a cooling medium is filled within the circulating heat dissipation pipeline, the heat absorption part is disposed around the batteries or in contact with the outer walls of the batteries, and the heat dissipation part contacts the external flowing air or the heat dissipation enclosure. The cooling system may also be a gravity heat-pipe comprising an evaporation part, a condensation part, an ascending conduit and a descending conduit, wherein at least one of the evaporation part and the condensation part comprises a plurality of rack conduits in communication with each other. A low boiling point medium is filled within the rack conduits. The evaporation part is in close contact with the batteries, or in contact with the batteries via a good conductor, or provided around the batteries. The condensation part is provided above the evaporation part and in communication with the evaporation part via the ascending conduit and the descending conduit, the condensation part is located in the external flowing air or contacts with the heat dissipation enclosure comprising at least a portion of the enclosure of the electric vehicle body or at least a portion of the enclosure of the battery box body contacting with the external flowing air. When the rechargeable standard battery units according to the present invention are loaded into the battery box of the present invention, a rechargeable battery pack is formed that is applicable to the method of quickly supplying electric energy to electric vehicles according to the present invention. As the size of the standardized elementary battery unit used is relatively small and may be adapted to a variety of applications, the rechargeable battery pack may be applied to various electric vehicles including electric bicycles, electric cars, electric buses, railed electric buses etc. After that, construction of such electric energy supply stations similar to fuel stations would be widely realized. Then, electric energy to electric vehicles may be conducted quickly according to the method of quickly supplying electric energy to electric vehicles of the present invention, providing a good condition for popularizing electric vehicles. Of course, the existing fuel stations may be updated by adding related equipment to provide battery replacement and power supply services to electric vehicles, meanwhile, the fuel stations may recharge the replaced batteries for cycling use; similarly, urban electric vehicles with pantograph system (wired) may park at designated stations for battery replacement and electric power supply based on the actual consumption of electric energy, thus not requiring the pantograph system. As such, the problem of long charging time of electric vehicles preventing the popularizing of such vehicles in a wide range may be solved. A slow charge port and a corresponding transforming device may be provided on the battery box for self-charge, such that the electric vehicles may be recharged during idle time such as parking in the garage, using trough power preferentially, or using wind power or photovoltaic power. A quick charge port and a corresponding transforming device may also be provided on the battery box for quickly recharging in case of a charging station without interchangeable batteries in stock. In the method of quickly supplying electric energy to electric vehicle according to the present invention, electric power is provided through standard battery units comprising standardized small elementary battery units, such standard battery units provided in the battery box of the electric vehicles are quickly loaded and unloaded for quickly supplying electric energy to electric vehicles. After normalization of standard battery units depending on the different models of electric vehicles, the existing fuel stations or vehicle parking spots may be used to provide battery replacement and electric power supply services to electric vehicles, making electric power supply to electric vehicles as convenient as existing gas supply to vehicles. The replaced batteries are recharged at the fuel stations or vehicle parking spots for cycling use. Otherwise power supply stations similar to fuel stations may be widely constructed to achieve this goal. The problem of long charging time of electric vehicles makes drivers reluctant to wait and lead to large occupying space of charging stations thereby hurdling electric vehicles from being popularized; and such problem may be completely solved using the method of quickly supplying electric energy to electric vehicles according to the present invention, while on the other side, the said method may also bring in other environmental benefits including energy saving, emission reduction and noise reduction. The standard battery unit according to the present invention is easy to use and reliable in performance, and particularly applicable to the method of quickly supplying electric energy to electric vehicles according to the present invention. The standard battery unit of the present invention is of small size, light weight, easy to operate, with strong applicability such that it may be used with most of the current available vehicle models, with a larger overall surface area, and easy to dissipate heat; the standard battery unit of the present invention is successfully applied to low-to-medium voltage batteries in electric vehicles, making it safer to use during charging and operation. In addition, the battery box of the present invention is of a simple structure and reliable in operation, enabling convenient battery replacement; it is also provided with a cooling system and safe, applicable to various electric vehicles, thus of great market potential. After equipping the electrical vehicles with the rechargeable battery pack formed by loading the standard battery units of the present invention into the battery box of the present invention, the standard battery units in the battery box may be quickly replaced as desired, making electric power supply more convenient and rapid. To summarize, the method of quickly supplying electric power to electric vehicle and the power supply device thereof according to the present invention may be applied to various electric vehicles including electric bicycles, electric cars, electric buses, railed electric vehicles, wired electric vehicles etc. as well as dual mode electric vehicles or electric watercrafts. It is since of great market potential, and may bring in huge economical benefits as well as social benefits. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is the first structural schematic view of a standard battery unit according to the present invention. FIG. 50 is the left view of FIG. 1. FIG. 2 is the second structural schematic view of a standard battery unit according to the present invention. FIG. 51 is the left view of FIG. 2. FIG. 3 is the third structural schematic view of a standard battery unit according to the present invention. FIG. 52 is the left view of FIG. 3. FIG. 4 is the fourth structural schematic view of a standard battery unit according to the present invention. FIG. 53 is the left view of FIG. 4. FIG. 5 is the fifth structural schematic view of a standard battery unit according to the present invention. FIG. 54 is the left view of FIG. 5. FIG. 55 is the sixth structural schematic view of a standard battery unit according to the present invention. FIG. 6 is the seventh structural schematic view of a standard battery unit according to the present invention. FIG. 7 is the eighth structural schematic view of a standard battery unit according to the present invention. FIG. 8 is the left view of FIG. 7. FIG. 9 is the ninth structural schematic view of a standard battery unit according to the present invention. FIG. 56 is the left view of FIG. 9. FIG. 57 is the second schematic drawing of the geometry of the standard battery unit according to the present invention of FIG. 9. FIG. 58 is the third schematic drawing of the geometry of the standard battery unit according to the present invention of FIG. 9. FIG. 10 is the first structural schematic view of a battery box according to the present invention. FIG. 11 is a sectional view of FIG. 10 along line A-A. FIG. 12 is the schematic view of the application of the battery box according to the present invention of FIG. 11. FIG. 13 is a sectional view of FIG. 12 along line B-B. FIG. 14 is the second structural schematic view of the battery box according to the present invention. FIG. 15 is the third structural schematic view of the battery box according to the present invention. FIG. 16 is the fourth structural schematic view of the battery box according to the present invention. FIG. 59 is the view illustrating the principle of the connection of the electrode contact rails within the battery box of FIG. 16. FIG. 17 is a sectional view of FIG. 16 along line C-C. FIG. 18 is the schematic view of the application of the battery box according to the present invention of FIG. 16. FIG. 19 is the schematic drawing of FIG. 18 along E direction. FIG. 20 is the fifth structural schematic view of the battery box according to the present invention. FIG. 21 is the schematic drawing of FIG. 20 along F direction. FIG. 22 is the schematic view of the application of the battery box according to the present invention of FIG. 20. FIG. 23 is the schematic view of the application of the battery boxes according to the present invention of FIG. 16 and FIG. 20. FIG. 24 is the sixth structural schematic view of the battery box according to the present invention. FIG. 25 is the schematic drawing of FIG. 24 along K direction. FIG. 61 is the structural schematic view of the electrode contact rails within the battery box of FIG. 24. FIG. 26 is the schematic view of the wire connections between the electrode contact rails and the standard battery unit of FIG. 24. FIG. 27 is the schematic view of the application of the battery box according to the present invention of FIG. 24. FIG. 28 is the seventh structural schematic view of the battery box according to the present invention. FIG. 29 is the structural schematic view of the standard battery unit according to the present invention. FIG. 30 is the left view of FIG. 29. FIG. 31 is the eighth structural schematic view of the battery box according to the present invention. FIG. 32 is the top view of FIG. 31. FIG. 33 is the schematic view of the application of the battery box according to the present invention of FIG. 31. FIG. 34 is the ninth structural schematic view of the battery box according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment As shown in FIG. 1 and FIG. 50, the standard battery unit of the present invention comprises an elementary battery unit 87 with an elastic extension structure 17 provided on the anode, the elastic extension structure 17 being composed of a spring made of a metallic good conductor material. An electrode cap 16 made of a metallic good conductor material is provided on the front end of the spring 17 to prevent foreign matters from falling into the spring 17. The electrode cap may slide relative to the anode while all the time maintaining a good contact with the anode due to the connection by the spring 17. The cathode of the elementary battery unit of the present embodiment is of a typical flat end structure. The elementary battery unit 87 of the present embodiment may be any of batteries including a lead-acid storage battery, a lead acid gel battery, a metal hydride/nickel battery, a lithium-ion battery, or an iron oxide-lithium battery, and can not be further disassembled as an individual battery. The extension value of the electrode may be adjusted during operation as of the elastic extension structure provided at the electrode, thereby keeping an effective contact with a connecting port of a related circuit all the time to make the working performance even more consistent and reliable. The present embodiment is explained in conjunction with the example of the cylindrical elementary battery unit 87, in practical applications, the elementary battery unit in rectangular or any other shapes may be adopted, falling within the scope of the present invention. Unless otherwise stated, this applies to all standard battery units of the present invention, and would not be repeated in the following embodiments. Second Embodiment As shown in FIG. 2 and FIG. 51, the difference between the standard battery unit of the present embodiment and that of the first embodiment is that, electrodes are provided protruding from the respective end face at the two ends of the elementary battery unit 87 respectively, with elastic extension structures 17 and 19 provided on the anode and the cathode respectively, wherein the elastic extension structures 17 and 19 in the present embodiment are made of elastic rubber material. Wherein an electrode cap 16 made of a metallic good conductor material is provided on the elastic extension structure 17 and connected with the anode of the elementary battery unit 87 via a wire 28; an electrode cap 18 made of a metallic good conductor material is provided on the elastic extension structure 19 and connected with the cathode of the elementary battery unit 87 via a wire 29. Attention should be paid to the strength of the connection between the electrode caps and the electrodes, to prevent adverse effects due to accidental falling off of the electrode caps. The present embodiment is explained in conjunction with an example of the rectangular elementary battery unit 87, and the profile of the cross section of the electrode cap 16 is circular. Likewise, the profile of the cross section of the electrode cap 18 is also circular. No drawings other than descriptions are provided as they belong to simple shapes being adopted in the art. In addition, the size of the electrode cap 16 is larger than that of the electrode cap 18 to distinguish the anode and the cathode. It needs to be noted that in practical applications, the shapes of the electrode caps may also be provided as other shapes such as square or triangular etc., and the electrode caps 16 and 18 may also be distinguished by other features such as colors, shapes, and sizes etc., wherein the size difference is the easiest to enable automatic identification, thereby preventing from mistaking the directions of electrodes during mounting. In addition, other than metal springs and rubber materials mentioned above, the elastic extension structure may also be made of materials such as elastic polyurethane etc., with a same effect. Third Embodiment As shown in FIG. 3 and FIG. 52, the difference between the standard battery unit of the present embodiment and that of the second embodiment is that, the present embodiment is explained in conjunction with an example of a cylindrical elementary battery unit 87, elastic extension structures 17 and 19 are both made of metal springs, and the profiles of the cross sections of the electrode caps 16 and 18 are square. In addition, in order to prevent damages from excessive wear of the standard batteries in repeated loading and unloading procedures, wear-resistant pad layers 15 are provided on the elementary battery unit 87. In the present embodiment, the wear-resistant pad layers 15 are made of a wear-resistant and heat-resistant engineering plastic. As of the wear-resistant pad layers 15 included in the standard battery unit of the present embodiment, effective protection to the standard battery unit itself is established, mitigating wear to the enclosure of the standard battery unit during operation, thereby the life span of the product is increased significantly. It has to be noted that, preferentially, the wear-resistant pad layers are only properly provided locally in certain positions in contact with the external structure during operation of the standard battery unit, in order to facilitate heat dissipation of the standard battery unit. Of course, for the wear-resistant pad layers made of materials with excellent heat dissipation capability, it may not exclude the use of the pad layer all over the surface of the standard battery unit other than at the electrodes. However, from the heat dissipation and cost saving perspectives, it is preferential to provide the pad layer locally. Other than engineering plastics mentioned above, materials such as foam materials or polyurethane etc. may also be used to make the wear-resistant pad layer, at the same time with shock absorption and cushioning functions. Fourth Embodiment Other than the anode and the cathode provided on two ends of the elementary battery unit 87 respectively, the present invention may also be applicable to that with the anode and the cathode provided on one and the same end of the elementary battery unit 87. As shown in FIG. 4 and FIG. 53, the difference between the standard battery unit of the present embodiment and that of the third embodiment is that, the external shape of the elementary battery unit 87 of the present embodiment is rectangular, with the anode and the cathode thereof provided on one and the same end face. In order to distinguish the anode and the cathode, the electrode cap 16 connected with the anode is provided as red, while the electrode cap 18 connected with the cathode is provided as green. It has to be pointed out that the above colors are not shown in the drawings rather than merely being described herein. In addition, in order to prevent the accidental damages by external impacts, elastic cushion pad layers 80 are provided on the standard battery unit of the present invention. In consideration of heat dissipation, in the present embodiment, the elastic cushion pad layers 80 are also provided locally and made of rubber materials. As of the elastic cushion pad layers provided, the standard battery unit is much more resistant to accidental damages, thereby beneficial to life span increase of the products. Furthermore, the elastic cushion pad layers are also provided on the surface of the standard battery unit contacting with the external structure, thereby establishing an effective protection to the standard battery unit to prevent excessive wear. As such, the elastic cushion pad layer may also act as the wear-resistant pad layer. Other than rubber materials, the elastic cushion pad layer may also be made of elastic polyurethane or an elastic foam material etc. The electrodes may be distinguished by colors, however, in order to enable automatic identification and error correction of battery electrodes, preferentially, the anode cap and the cathode cap are provided with different shapes or sizes. Fifth Embodiment As shown in FIG. 5 and FIG. 54, the difference between the standard battery unit of the present embodiment and that of the first embodiment is that, the standard battery unit is formed by connecting four cylindrical elementary battery units 87 two by two in series and then connecting the serially-connected elementary battery units in parallel via wires 82, and is disposed into a standard enclosure 58 not to be disassembled during application procedure. Electrodes including an anode 81 connected to the battery pack comprising the elementary battery units 87 via the wires 82 and a cathode 83 made of a good conductor metallic plate are provided on the standard enclosure 58. The application procedure refers to that during normal life span of the standard battery units, the standard enclosure 58 of the present embodiment is made of insulating engineering plastic materials. In order to facilitate heat dissipation, a plurality of through holes 62 in communication with the external environment is provided on the standard enclosure 58. Channels for the elementary battery units to dissipate the heat generated during operation are provided by the gaps between the elementary battery units and the standard enclosure as well as the through holes 62. In order to ease the explanation of the technical theory of the present embodiment, an example with only four elementary battery units provided in the standard enclosure is provided, however, in practical applications, the number of the elementary battery units may be increased or decreased as desired. In addition, based on the technical theory of the present embodiment, the connecting relationships between the elementary battery units in the standard enclosure may not be limited to the case of connecting the elementary battery units two by two in series followed by connecting the serially-connected elementary battery units in parallel as mentioned, various connections including serial connection, parallel connection, or a combination of serial connection and parallel connection may be provided based on actual needs. The basic theory is that the nominal voltage of the standard battery unit is increased by serial connections between the elementary battery units and the capacity of the standard battery unit is increased by parallel connections between the elementary battery units. In addition, connections may be performed not only by wires, but also by metallic plates and strips etc. made of good conductors, with the same effects. Sixth Embodiment As shown in FIG. 5 and FIG. 55, the difference between the standard battery unit of the present embodiment and that of the fifth embodiment is that, eight elementary battery units 87 are provided in the standard enclosure 58, the elementary battery units being divided into groups of four elementary battery units and disposed in the standard enclosure 58 by two rows in parallel. The two groups of elementary battery units are finally connected with the anode 81 after being connected in parallel via wires 82. The specific wire connections of the present embodiment belong to conventional techniques in the art, thus would not be described with additional drawings. Based on the technical theory of the present embodiment and in conjunction with that of the fifth embodiment, the number and the arrangement of the elementary battery units within the standard enclosure of the standard battery unit of the present invention may be provided according to actual needs, without departing the scope of the present invention. Seventh Embodiment As shown in FIG. 6, the difference between the standard battery unit of the present embodiment and that of the fifth embodiment is that, an elastic extension structure 17 composed of a spring made of a metallic good conductor material is provided on the anode of the standard battery unit, an electrode cap 16 made of a metallic good conductor material is provided on the front end of the spring in order to prevent foreign matters from falling into the spring. It has to be additionally pointed out that, as of the good conductivity of the metal spring, the electrode cap 16 and the anode 81 of the standard battery unit are connected by the spring directly, without providing an additional wire. Of course the elastic extension structure of the electrode of the standard battery unit of the type of the present embodiment may be made of a rubber material or an elastic polyurethane material. Eighth Embodiment As shown in FIG. 7 and FIG. 8, the difference between the standard battery unit of the present embodiment and that of the seventh embodiment is that, elementary battery units 87 whose external shape is rectangular are used, with elastic cushion pad layers 80 made of elastic polyurethane material provided thereon. In addition, the electrode cap 16 of the standard battery unit anode is connected to the anodes of the elementary battery unit 87 via wires 84. An electrode protruding from the end face of the standard enclosure 58 is also provided at the cathode of the standard battery unit, an elastic extension structure composed of a metal spring 19 made of a good conductor and an electrode cap 18 being provided on the electrode; and the electrode cap 18 is connected to the cathode of the elementary battery units 87 via wires 85. The standard battery unit of such structure may be more resistant to external impacts as of the elastic cushion pad layers provided on the internal elementary battery units, and the performance is more consistent and reliable as of the elastic extension structures provided respectively on the anode and the cathode. Ninth Embodiment As shown in FIG. 9 and FIG. 56, the difference between the standard battery unit of the present embodiment and that of the eighth embodiment is that, the anode and the cathode of the standard battery unit are provided on one and the same end of the
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