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In terms of fighting a fire in a HV lithium ion battery, the answer is water, and lots of it.
You don't have to worry about shorting a 400v battery, because the water will be shorting each 3.7v cell directly, so long as you flood it properly. The water needs to keep flowing for a long time to make sure that every cell drops to ambient temperature, otherwise the hot cell will heat its neighbours again.
Emyr-
Aren't most of the battery packs sealed units and water would only short the parts that it comes into contact with, whatever potential difference that's across them. Be that 400v or 3v or something in between.
Even if a pack badly ruptured, getting a meaningful amount of water onto the cells would be hopeless trying to cool it without full Imersion.
user69121
So when they become more mainstream, they should have a solution to disposal? I understand they have a certain amount of ‘recyclability’, but I still have my doubts long term.... as to the container thing, I have no knowledge of that plannof attack! That’s the trouble though..... it’s a secretive industry, that lots of money is being ploughed into, so nobody wants to share info......