Internal Short Circuit Fault Diagnosis for Lithiumion Battery Based on Voltage and Temperature

The internal short circuit is one of the main causes of fire and explosion of electric vehicle power battery. It is of great importance to detect the internal short circuit fault of lithium battery early for the safe operation of electric vehicles. This paper presents an internal short circuit fault diagnosis method based on the voltage and temperature. The method uses directly measured cell voltages and temperatures without the need of additional hardware. The fault diagnosis of the internal short circuit is realized by analyzing the difference of the voltages and temperatures between the fault battery and the normal battery. In the experiment, three resistors with different resistance values are connected to the battery in parallel to simulate different levels of failure. Experimental results show that this method can effectively diagnose the internal short circuit of the battery.