Sorry to hear. I have a couple of questions that may shed some light on any damage to the EV drive system.
1. Was the body itself damaged? The plastic bumper cover is a replaceable part, but if the metal where the charge ports are was crumpled, then definite body work is needed.
2. How far was the bumper pushed in? Did it damage the rear hatch?
There is a decent amount of crumple space behind the bumper before any drive components are affected. However, if it pushed the inner fenders into the tires, then it may have damaged structure under the car, but it depends where the bumper was hit (high or low). If you have any pictures you'd like to share, the link below will put them in my Dropbox, at which point I can re-share to the forum.https://dbinbox.com/pv1
However, what really makes me worry is the difficulty others have had in sourcing replacement parts. For example, a fender bender a couple of years ago nearly totaled an i-MiEV simply because parts couldn't be found. Luckily, a forum member here had the remains of a salvage car and was able to supply the parts needed. That car is still on the road today.