Diode for 200v charging of ev battery module
DO NOT DO THIS.

You cannot simply attach a DC power supply to an automotive battery like this to charge it. Doing so is exceedingly dangerous and you could start a serious fire that cannot be easily put out with a conventional fire extinguisher. 200V is also more than enough to do you some serious harm, either in terms of electric shock or burns from a short.

These batteries are intended to be charged by a proper charge controller that regulates the charge voltage and current while monitoring the battery voltage and internal temperature. The proper chargers also include a heap of safety features that a simple DC power supply will not have.

If the battery voltage has dropped below the safe minimum level for charging, take the battery to an EV specialist. They can advise you on how to proceed with your specific model, and will likely have the correct equipment to safely restore the battery (or test if it is indeed safely restorable).