Calibration and finite element simulation of pouch lithium-ion batteries for mechanical integrity
Calibration and finite element simulation of pouch lithium-ion batteries for mechanical integrity
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DOI：
10.1016/j.jpowsour.2011.10.094
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发表时间：
2012-03-01
影响因子：
9.2
通讯作者：
Wierzbicki, Tomasz
中科院分区：
文献类型：
--
作者：
Sahraei, Elham;Hill, Rich;Wierzbicki, Tomasz
在五种负载条件下对袋装和裸锂离子电池进行机械测试。这些方法包括全厚度压缩、面内无侧限压缩、面内有侧限压缩、半球形冲压压痕和三点弯曲。根据测得的载荷-位移数据，计算隔膜、活性阳极和阴极材料的各个压缩应力-应变曲线。开发了FE模型，其由代表Al和Cu箔的壳单元和用于活性材料的固体单元组成，所述活性材料具有与分离器集中在一起的粘合剂。LS-Dyna数值模拟结果与试验结果在全厚度压缩、冲压压痕和侧限压缩方面具有很好的相关性。封闭形式的解决方案，也得到了揭示潜在的物理和识别重要的参数组。还证明了薄包装袋外壳提供了相当大的增强，并且在某些情况下改变了变形和失效机制。单个电池的当前计算模型提供了用于跨不同长度尺度对电池模块和电池组进行建模的基本构建块。本测试程序与行业执行的钉子压痕或冲头挤压加载有很大不同，并为开发锂离子电池强度/重量优化和安全评估所需的高级本构模型提供了数据。(C)2011 Elsevier B. V.保留所有权利。
Mechanical tests were performed on pouched and bare lithium-ion cells under five loading conditions. These included through-thickness compression, in-plane unconfined compression, in-plane confined compression, hemispherical punch indentation and three-point bending. From the measured load-displacement data, the individual compression stress-strain curves were calculated for the separator, the active anode and cathode materials. The FE model was developed, composed of shell elements, representing the Al and Cu foil, and solid elements for the active material with a binder lumped together with the separator. Very good correlation was obtained between LS Dyna numerical simulation and test results for the through-thickness compression, punch indentation and confined compression. Closed form solutions were also derived to reveal the underlying physics and identify important groups of parameters. It was also demonstrated that a thin pouch enclosure provided considerable reinforcement and in some cases changed the deformation and failure mechanism. The present computational model of an individual cell provides a fundamental building block for modeling battery modules and battery packs across different length scales. The present test program differs substantially from the nail indentation or punch crush loading performed by the industry, and provides data for the development of an advanced constitutive model needed for strength/weight optimization and safety assessments of Li-ion batteries. (C) 2011 Elsevier B.V. All rights reserved.