HitchHiker71
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Am I wrong thinking that when the battery pack is damaged is usually when the battery pack can experience a thermal runaway resulting in a fire or explosion hazard regarding an LFP EV battery ? Am I wrong thinking it's the amount of lithium in the battery pack that is the cause a larger fire because the thermal runaway reaction is larger ?
I have read that EV battery fire isn't covered under many home owner or auto insurance policies. This would be a concern for me.
Bill
No - that is not correct. Thermal runaway occurs due to overheating of the pack - hence the term thermal runaway. This is very rare with a good BMS like Tesla has. Sure it happens but by the numbers it’s 25 times less likely to occur than a ICE vehicle catching fire. Thermal runaway can occur due to overcharging - such as wrapping the L3 charger handle with a cold rag - which some people are known to do to cut down on charge times - but this causes overheating to occur. Thermal runaway can also occur due to a puncture or pack exposure to excessive heat - like a very hot fire adjacent to the vehicle itself.
It’s not the actual lithium that catches fire - it’s the liquid electrolytes that are part of the jelly roll that, when damaged, can leak the liquid electrolytes, which then causes combustion. This can occur due to puncture, contact with water, or exposure to extremely high temperatures.
Without the electrolytes in the battery packs - there’s really no risk of fire. This is why Tesla has been working on dry battery electrolytes for both the anode and cathode in their 4680 batteries. The Cybercell has a dry anode but still has a wet cathode. Work is complete on bringing dry cathode to the 4680 packs and this will ramp into production later this year and on into 2025. Once done, even NMC/NCM/NCA 4680 packs will have much lower fire risk than they already do today.
LFP packs, due to irons inherent stable chemical structure, are much safer and have much better thermal stability, and are therefore much less prone to thermal runaway, even when damaged or subjected to water or high temps.
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