Abstract:

High voltage safety is a key technology in the development of electric vehicles driving with high voltage power. A risk model of electric shock and thermal runaway was constructed with a top priority of users’ safety. The necessary conditions were investigated for interrupting the risk model by using the model system to identify the safety characteristic parameters. The high voltage safety system was designed and real vehicle test verification in 3 dimensions including setting safety characteristic parameters, detecting feature parameter functions, and having a strategy for abnormal state protection. The results show that the reasonable operation of the safety parameters can ensure the vehicle safety while the abnormal state can detect and disconnect the high voltage output in time and avoid the risk of electric shock when the low insulation resistance, the disconnected connector, the collision and other abnormal states occur. Therefore, the hazard model can assist the design of the vehicle high voltage safety system to improve the vehicle safety performance.

Key words: electric vehicle, high voltage safety, thermal runaway, hazard model, electric shock