Has a Toyota Hybrid Battery ever caught fire on it's own.

[bigblock]

Alot of ev's around the world are catching fire on there own, even when parked up. Has a hybrid Battery ever done this. I can't recall this happening to a Toyota not even in the early days of the Prius many years ago now.

[TonyHSD]

Well a quick searching shows some cases but generally speaking not a usual thing. 
https://www.edhat.com/news/hybrid-vehicle-catches-fire-in-los-alamos#:~:text=They suspect the first vehicle,hotel and no reported injuries.

Anything that has Battery has a risk of fire. Phone, tablet, scooter, bike, car , anything and the bigger the Battery the worse fire can be. 
 

 

[AisinW]

The NiMh Battery has much less problems with fire because chemically is more stable, withstand extreme heat and cold better, but less energy density or heavier for the same kWh.  It is less prone to thermal runaway. 

The newer Toyota use Lithium Ion Battery. However, the choise of suppier (Panasonic) and Battery management in Toyota are generally more concervative than other brands especially Chinese or Korean BEV.