Ford had some fire-related recalls recently[1]. Interestingly one of them was for hybrids, but not due to the battery. It was due to the heat shielding placement and that there was a decent chance of fire in the event of an engine failure from combustible fluids hitting hot parts.

Also I wouldn't say the car being in motion is a convenient time to have a fire. You're often not just standing there with a fire extinguisher handy.

1. https://www.reuters.com/business/autos-transportation/ford-i...