How can I use all of AA battery's energy in an instant?
There is no practical way to dump "all of the energy" in a flash. But you can discharge it slowly into an expensive UltraCap with many Farads of capacity and a few mΩ ESR and then dump the ultraCap in a flash enough to weld copper. 

This is how electronic flash cameras work today, except you get many flashes per battery charge using just normal low ESR caps not "UltraCaps".

Is this for Sir Guy Fox day or just for a lark to raise some eyebrows in airport security and end up in Gitmo or are you competing with the Swiss in generating a Higgs Boson particle?