Wang Genwei, Zhang Shu, Li Meng, Wu Juanjuan, Wang Bin, Song Hui
College of Aeronautics and Astronautics, Taiyuan University of Technology, Jinzhong 030600, China.
Shanxi Key Laboratory of Material Strength and Structure Impact, Taiyuan 030024, China.
Materials (Basel). 2021 Dec 18;14(24):7844. doi: 10.3390/ma14247844.
To explore the failure modes of high-Ni batteries under different axial loads, quasi-static compression and dynamic impact tests were carried out. The characteristics of voltage, load, and temperature of a battery cell with different states of charge (SOCs) were investigated in quasi-static tests. The mechanical response and safety performance of lithium-ion batteries subjected to axial shock wave impact load were also investigated by using a split Hopkinson pressure bar (SHPB) system. Different failure modes of the battery were identified. Under quasi-static axial compression, the intensity of thermal runaway becomes more severe with the increase in SOC and loading speed, and the time for lithium-ion batteries to reach complete failure decreases with the increase in SOC. In comparison, under dynamic SHPB experiments, an internal short circuit occurred after impact, but no violent thermal runaway was observed.
为探究高镍电池在不同轴向载荷下的失效模式，进行了准静态压缩和动态冲击试验。在准静态试验中研究了处于不同荷电状态（SOC）的电池的电压、载荷和温度特性。还利用分离式霍普金森压杆（SHPB）系统研究了锂离子电池在轴向冲击波冲击载荷作用下的力学响应和安全性能。识别出了电池的不同失效模式。在准静态轴向压缩下，热失控强度随SOC和加载速度的增加而变得更严重，锂离子电池达到完全失效的时间随SOC的增加而减少。相比之下，在动态SHPB实验中，冲击后发生了内部短路，但未观察到剧烈的热失控现象。
