I understand the spontaneous fires are much smaller . . .
Electric vehicle fires are rare—the risk for petrol and diesel vehicles is at least 20 times higher, says researcher
Australian firm EV FireSafe tracks passenger electric vehicle battery fires worldwide. From 2010 to June 2023, its database records only 393 verified fires globally, out of some 30 million electric vehicles on the road.
Australia recorded only four electric vehicle battery fires over the same period. One was linked to arson. The other three vehicles were parked in structures that burned down and destroyed the vehicles. So it appears these fires didn’t start in the batteries.
https://techxplore.com/news/2023-09-electric-vehicle-rarethe-petrol-diesel.html