AXA Insurance Company aimed to prove that electric car batteries could catch fire during a crash, which is true, though not very common. At any rate, in order to show people exactly how that could happen, the company staged a crash of a Tesla Model S.
As you'll see when you watch the brief video, the Model S undergoes a real crash test, though it was carefully calculated and staged by AXA. The Tesla sedan is launched up over a ramp, it scrapes its battery pack and then flips over and lands upside down. Not long after it comes to a stop, the underside of the car bursts into flames.