Er... Here are some Tesla cells being crushed.
I was a bit surprised how quickly they ignited. At the point when they ignited, the crushing had only just split the can. Given that the 2170 cells are bigger and contain more energy I expect them to be rather more fragile.
Incidentally, I estimated how much force you'd have to apply to a half ton of battery (500kg) whizzing along at 30 meters a second (A bit less then 70mph) in order to stop it in 100 milliseconds. This is a deceleration of 300 m/s squared - about 30 g - and the force required to do it is 150,000 Newtons.
What does a force of 150,000 Newtons imply in terms of everyday experience? Well, it is pretty near a fifteen-ton weight applied to the battery for that tenth of a second of deceleration.
If this is distributed over all the batteries equally, they might well stand it OK, but it is more likely that the cells at the front of the pack will stop much faster and the ones behind will carry on. In other words, you'll get a wave of crushing moving from front to back until all the kinetic energy is dissipated.