锂离子电池冲击挤压后安全特性研究综述

从实验和仿真两个角度综述了近年来国内外针对冲击挤压后锂离子电池安全特性的相关研究，从冲头形状、机械加载方式、机械加载位置、SOC 状态4 个影响因素进行分析总结。分析结果表明，锂离子电池内短路面积越大、冲击挤压位置越边缘、SOC 越高，则其失效时温度越高、电压突降越快、越易热失控；而锂离子电池应变量越大，内阻越小。根据冲击挤压热失控前锂电池的电压、温度、内阻等多种安全特性参数变化规律，建立锂电池安全状态的早期预警识别方法，对于防范新能源汽车因冲击挤压造成的热失控安全事故极为必要。

A review of the safety characteristics of lithiumion batteries after impact extrusion#br#

The relevant research on the safety characteristics of lithium- ion batteries after impact extrusion was summarized from both experimental and simulation perspectives at home and abroad in recent years, and the four influencing factors as punch shape, mechanical loading method, mechanical loading position, and SOC state was analyzed. The analysis results showed that the larger the internal short-circuit area of the lithium-ion battery, the more marginal the impact extrusion position and the higher the SOC, the higher the temperature at failure, the faster the voltage drop and the easier the thermal runaway; and the larger the strain of the lithium- ion battery, the smaller the internal resistance. According to the change law of the voltage, temperature, internal resistance and other safety characteristics parameters of lithium battery before thermal runaway by impact extrusion, an early warning identification method of lithium battery safety status is established, which is extremely necessary to prevent thermal runaway safety accidents caused by impact extrusion of new energy vehicles.