Research on fault diagnosis system of electric vehicle power battery based on OBD technology

In this paper, according to the severity of the fault of the battery system and the impact of different faults on the vehicle and the driver, the generation of battery system fault code based on OBD fault diagnosis protocol is completed, and the transmission of the fault code based on CAN bus and the application of OBD protocol in electric vehicle is realized. Experimental results show that the battery fault diagnosis expert system can run correctly in the battery management system hardware platform. It can keep the battery voltage, current, temperature and SOC parameters in a reasonable range. Timely and accurate diagnosis of the fault of the power battery ensure the safety and reliability of the battery system's operation.