The internal short circuit of the battery is a complicated and difficult to determine the cause of thermal runaway. It is a problem in the current battery safety field and can lead to catastrophic consequences. The internal short circuit of the battery cannot be fundamentally eliminated. At present, it is generally observed through a long period of time (more than 2 weeks) that the problem is found in an early stage.

In terms of battery internal short circuit identification, Jingwei Hengrun has more than 10 patents and patent licenses worldwide. Using symmetrical loop circuit topology (SLCT) and related algorithms, it is possible to perform batch internal short circuit detection on multiple battery cells in a very short time (within 5 minutes), and can identify internal short circuits of the order of 0~100kΩ and accurately estimate them Internal short resistance value. This method can significantly reduce the operating costs of battery cell manufacturers or module assembly manufacturers, and improve the safety of the battery production and use process.