The well known legal requirements out of the vehicle safety point of view are the ECE-R100 and the FMSS 305 respective SAEJ 1766.
The ECE-R 100 describes the requirements according to the approval of electric vehicles in Europe, but it doesn’t include any crash requirements. For the crash the vehicles have to meet the crash requirements of the conventional vehicles. Most of the OEM’s have special internal requirements, for example the there has to be a protection according to short cuts or fire after a crash test.