Abstract:

The response mechanism of the geometrical shape, properties and arrangement form under impact load was clarified for the special parts of electric vehicle (EV) such as high voltage battery module and power battery pack to provide reference for electric vehicle design and development. In combination with the results of the collision test of electric vehicle, the probability statistics of collision accident and the typical traffic accident conditions, a high-voltage collision safety protection design scheme was designed based on collision poweroff protection and real-time insulation monitoring. By using computer aided engineering (CAE) simulation calculation, the space layout of high voltage components was optimized to solve more than 90% of medium-speed and low-speed traffic accident problems. The corresponding collision safety boundary under the high speed collision condition was developed, and the response signal of power of protection was extracted. The result shows that double protection, including monitor the insulation resistance of electric vehicle in real time and
performing power of function by the electric relay, can avoid the failure of electrical safety protection caused by a single factor failure, by which the actual high voltage protection of electric vehicle is realized.

Key words: electric vehicle (EV), safety design and protection, computer aided engineering (CAE) simulation, collision interruption, insulation protection