Electric vehicle battery fires are very rare. Research by Australian company EV FireSafe has been able to verify approximately 511 EV battery fires globally since 2010 (as of June 2024).
Data from Sweden suggests the likelihood of an EV fire is around 20 times less likely than a petrol/diesel vehicle fire, after accounting for the differences in the market share of each vehicle type.
Here in Australia, there are only six verified EV battery fires in road-registered passenger vehicles; one was caused by arson, three were due to an external fire consequently setting the cars alight, one because it was involved in a crash, and one down to hitting road debris which penetrated the battery.