DaveInAvl wrote:Apologies if this has been discussed already. Might it be possible that the battery temperature sensor module fails in a way that always indicates that the battery is too cold? This would turn the battery heater on, and leave it on no matter how hot the battery got. Could this induce thermal runaway?
I suppose anything is possible, but in my opinion, the separator in the battery is getting compromised (probably from dendrite growth) which causes a short. Then the energy stored in the battery is "dumped" through that small area which causes a fast temperature rise and leads to a fire.
I'm sure GM is vigorously pursuing a solution but they are hampered because the "evidence" was burned in the fire. My guess is they'll wind up replacing the batteries, like Kona did, or offer a new car with a battery made in the US.
Edit: If the sensor is a thermocouple and fails, it will read a high temp, which should turn on battery cooling.