Thanks for the info & link. Reading thru the link, the 'fire' happened approx 3 weeks after a side impact controlled NHTSA crash test. As there are no details, I would assume the 'fire' was internal to the battery pack, as they said there was damage to it from the side impact.
One would think that in a real world situation, the battery pack is isolated from the 'load', usually by the first responders to an accident. And, one would think that the battery pack would be 'pulled' from the car IF it showed any damages.