Electronics > Projects, Designs, and Technical Stuff

Deliberate Lithium cell overcharging

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james_s:
There's no need to abuse the cells prior, lithium battery fires occur when cells are overcharged, or when they short circuit internally which is also what happens when they are overcharged. Worn out or abused packs tend to be more vulnerable because they can get out of balance but it's the overcharging that makes them burn.

That said, I don't really see what the point is here. The best way to fight a lithium battery fire is plain old fashioned water and lots of it. Take away the heat and the fire goes out.

Zero999:
Be careful. Lithium batteries are highly explosive. Photonicinduction did a couple of videos of them being abused.

Poking one with a skewer causes an explostion.


Fast forward to 6:00 for the lithium part. A small cell burns quite well when connected to AC.

james_s:
They are not "highly explosive", or even moderately explosive, they contain flammable materials and a lot of stored energy so they can burn vigorously. That is not an explosion, it is a fire.

High explosives are things like nitroglycerine, dynamite, TNT, RDX, etc. No lithium battery behaves anything like this.

Zero999:

--- Quote from: james_s on May 11, 2019, 09:32:44 pm ---They are not "highly explosive", or even moderately explosive, they contain flammable materials and a lot of stored energy so they can burn vigorously. That is not an explosion, it is a fire.

High explosives are things like nitroglycerine, dynamite, TNT, RDX, etc. No lithium battery behaves anything like this.

--- End quote ---
The first video certainly does look like an explosion, rather than a fire, as there are no flames.

Where it actually is an explosion or not, the effect is the same: a big bang, along with lots of heat is produced.

amyk:
That was definitely not an explosion, there wasn't even a "big bang". If it was an explosion there would be a shockwave and shrapnel everywhere.

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