Exploding a Lithium Ion Battery-From Royal Institution CHRISTMAS LECTURES 2016
Saiful Islam drops a nail through a lithium battery, and explains what it is that causes mobile phones to explode
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It is not necessarily always be the nail to short circuit and overheating eventually. It may be some other means which can overheat a bad battery and it can explode as happened in the recent explosions of Samsung batteries.
this is just to demonstrate that short circuit can cause overheating.Nail is not important