Lithium explosion DIY powerwall incident

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While assembling a DIY power wall he had an incident when his friend accidentally drove a screw through a lithium module, resulting in explosive failure.

With lithium cells, the danger isn't with the lithium itself, but the energy they store. When you puncture a cell it results in very high current flow that evaporates the flammable electrolyte and then ignites it with sparks from the short circuit. When working with them it's a good idea to discharge them as low as possible, so there is less energy to dissipate if you have an incident.

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