软包锂电池在挤压工况下热失控的实验研究OA

The short circuit failure caused by local squeeze of soft-pack batteries is a typical operating condition in a car crash,and it is also the most dangerous loading form.The experiment took a domestic commercial soft-pack battery as the research object,and conducted an extrusion experiment under the mechanical abuse experimental platform.By observing and recording the parameters of stress,temperature and voltage during the experiment,the characteristics of thermal runaway occur in the battery are analyzed.The results show that in the extrusion experiment,the process of thermal runaway in the battery can be divided into different stages at different angles,and each stage has its own characteristics;the state of charge has little impact on the mechanics,thermal and electrical aspects of the soft-pack battery under the extrusion conditions;with the increase of the loading speed,the battery limit load becomes smaller,the battery temperature changes faster,and the voltage short-circuit time becomes shorter;with the change of the loading angle of the head,the limit load and temperature both increase with the increase of the extrusion angle,and the battery short-circuit time is not much different;the larger the radius of the cylindrical head,the greater the battery limit load,and the temperature and the short-circuit time are not correlated with the size of the head.