锂离子动力电池外部短路测试平台开发与试验分析

Battery safety, as a key factor, restricts the development of electric vehicles (EVs). Safety incidents caused by batteries have attracted much public attention in recent years. External short circuit (ESC) is one of the reasons of safety incidents in EVs, and it is also one of the reasons that trigger the thermal runaway of batteries. ESC test platforms for commercialized lithium-ion battery cells and packs are developed. Under different initial state of charge, ambient temperature, short-circuit resistance values, short-circuit durations, and aging conditions, systematic ESC experiments on battery cells and packs are conducted. The influence of initial conditions on battery electro-thermal characteristics is studied and the failure principle of ESC batteries is revealed. The research in this paper will provide data support for the establishment of the ESC fault database, and study of modeling, fault diagnosis and temperature prediction of ESC, which will further lay the foundation for the safety management of lithium-ion batteries for EVs.