In the current electric vehicle (EV) market, cylindrical lithium‐ion batteries (LIBs) have played an indispensable role due to their high capacity and stability. However, LIBs are generally recognized as fragile and may cause fires or explosions when broken. Upon this issue, most studies focus on revealing the detailed reaction and interior change in the LIB during using or abuse conditions. However, in this study, we would like to provide a highly accessible model for automotive cylindrical LIBs that is practical in engineering application and can reduce computational effort in the entire EV crash simulation. In order to achieve this goal, the LIB model is built and meshed as a whole and a specific anisotropic material model is set so as the model can apply to multidirectional mechanical loading. Considering various operating condition of LIBs, state of charge (SOC) dependence and dynamic effect is termed as factors worth noticing when establishing this model. Furthermore, to predict the electrochemical responses and failures of LIBs, two optional short‐circuit criteria are defined. The proposed modeling method provides a powerful tool for analyzing the safety of batteries and battery packs with less computational and analytic effort than previous approaches.

中文翻译：

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圆柱型锂离子电池多方向机械载荷下快速验证的计算模型

在当前的电动汽车（EV）市场中，圆柱形锂离子电池（LIB）由于其高容量和稳定性而起着不可或缺的作用。但是，LIB通常被认为是易碎的，断裂时可能引起火灾或爆炸。针对此问题，大多数研究都集中于揭示LIB在使用或滥用条件下的详细反应和内部变化。但是，在这项研究中，我们希望提供一种高度可访问的汽车圆柱形LIB模型，该模型在工程应用中很实用，并且可以减少整个EV碰撞仿真中的计算量。为了实现此目标，需要构建LIB模型并将其作为一个整体进行网格化，并设置特定的各向异性材料模型，以便该模型可以应用于多方向机械载荷。考虑到LIB的各种运行状况，建立此模型时，电荷状态（SOC）的依赖性和动态效果被称为值得注意的因素。此外，为了预测LIB的电化学响应和失效，定义了两个可选的短路判据。所提出的建模方法为分析电池和电池组的安全性提供了强大的工具，与以前的方法相比，其计算和分析工作量更少。