Investigation on the explosion dynamics of large-format lithium-ion pouch cells

被引:7
|
作者
Shan, Tongxin [1 ]
Zhu, Xiaoqing [1 ]
Wang, Zhenpo [1 ]
Wang, Hsin [2 ]
Gao, Yanfei [3 ]
Li, Lei [1 ]
机构
[1] Beijing Inst Technol, Natl Engn Res Ctr Elect Vehicles, Beijing 100081, Peoples R China
[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Lithium-ion battery safety; Thermal runaway; Shockwave; Explosion dynamics; Detonation model; CHAPMAN-JOUGUET DETONATION; THERMAL-RUNAWAY; NUMERICAL-SIMULATION; ELECTRIC VEHICLES; LI(NI0.6CO0.2MN0.2)O-2 CATHODE; SAFETY ASSESSMENT; COMBUSTION WAVES; DEFLAGRATION; PROPAGATION; TRANSITION;
D O I
10.1016/j.applthermaleng.2023.120426
中图分类号
O414.1 [热力学];
学科分类号
摘要
Explosion is the most extreme case of thermal runaway of lithium-ion (Li-ion) batteries. In this study, explosion dynamics of large-format Li-ion cells are investigated experimentally and numerically. Overcharge-to-explosion tests are conducted on 40 Ah Li-ion cells with Li[Ni0.8Co0.1Mn0.1]O2 cathode. Based on the explosion physics, shockwave and detonation models are used to characterize the shock effect of the cell explosion and evaluate the explosion equivalent. Von Neumann peak is observed on the pressure curves, and the shockwave velocity is supersonic at this time; the unwrinkled spherical flame phenomenon observed in the experiment indicates that it is detonation. Additionally, a geometric model is established based on the real testing scenario, and the explosion behavior is numerically studied. The characteristics of the explosion dynamics process are interpreted and the propagation mechanism of the shockwave are revealed; the deflagration to detonation transition (DDT) phe-nomenon in this process is caused by the formation of "hot spots", and the explosion of the cells eventually turns into stable combustion. This study fills the gap in the research on thermal runaway of Li-ion cells, especially in the extreme cases of fire and explosion, and provide useful guidance for battery safety.
引用
收藏
页数:15
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