关键词: 新能源汽车；动力电池；继电器；电容泄放

Abstract: The high-voltage relay in the power battery is responsible for closing and opening the high-voltage circuit, directly affecting whether the vehicle can operate normally. Therefore, establishing a comprehensive relay adhesion diagnostic strategy is crucial for vehicle safety. Taking a certain new energy vehicle as an example, based on the high-voltage electrical architecture of its power battery and combined with previous engineering development experience, this paper designs a relay adhesion strategy for real-time diagnosis, and validates it through simulation using MATLAB/ Simulink. The results show that the improved strategy can diagnose relay adhesion faults in real-time during power battery operation, preventing false alarms caused by failure of active discharge of vehicle capacitors, and the strategy is safe and reliable. The solution adopted in this research enables rapid and accurate diagnosis of relay faults, demonstrating strong application value for ensuring the safe operation of new energy vehicles and serving as a valuable reference for simplifying the maintenance of power battery relay failures.

Key words: new energy vehicles; power battery; relay; capacitor discharge