Electric vehicle battery fires are very rare. Research by Australian company EV FireSafe has been able to verify approximately 400 EV battery fires globally since 2010.
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 five verified EV battery fires in road-registered passenger vehicles; one caused by arson, three where the EV was parked in a private residential garage that caught fire due to other causes, and one in a battery that had been removed from an EV in a private car park.