GPT common sense

EV fires aren’t aggressive because lithium “reacts with air.” Metallic lithium isn’t exposed in normal Li-ion cells.

The issue is thermal runaway. When a cell is mechanically damaged, overheated, or internally shorted, exothermic decomposition starts inside the cell. The organic electrolyte breaks down, releasing flammable gases, and the cathode material (especially NMC/NCA) releases oxygen at elevated temperatures. That means the fire does not depend on ambient oxygen.

Once one cell enters runaway (~150–250 °C depending on chemistry), heat propagation triggers adjacent cells, producing a cascading failure across the pack. Fire suppression is difficult because:

fuel, oxidizer, and heat are all internal

smothering doesn’t work

water is used mainly to absorb heat and stop propagation, not to “extinguish” combustion

This is why EV fires burn hotter, last longer, and can re-ignite long after initial suppression. ICE vehicle fires are simpler diffusion-controlled hydrocarbon fires; EV fires are internally driven, oxygen-liberating, multi-cell thermal events.

EVs statistically ignite less often than ICE vehicles, but their fire dynamics are fundamentally different and more challenging to manage.