After an EV accident, gases from a damaged battery may reach a level that could ignite due to what condition?

• A. Ambient humidity
• B. Fresh air intake
• C. Overheated damaged cell
• D. Rapid cooling

Answer: (C)

Flammable gases are released when a damaged EV battery overheats and cells begin to vent or undergo thermal decomposition. The overheating creates enough heat and energy in the damaged cell to both generate and release gases such as hydrogen, which can accumulate in the surrounding area. If these gases reach a flammable mixture in air and there is an ignition source, ignition can occur. So the condition that leads to this ignition risk is the overheating of a damaged cell, which drives both gas production and the heat needed to ignite the mixture. Ambient humidity doesn’t drive ignition of vaporized battery gases, fresh air intake mainly helps dilute flammable gases, and rapid cooling would reduce gas generation and lower the risk.