考虑蠕变影响的锂离子电池电流中断装置的失效行为研究,International Journal of Energy Research

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考虑蠕变影响的锂离子电池电流中断装置的失效行为研究
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-08-11 , DOI: 10.1002/er.5689
Fen Lin ₁ , Jianlei Li ₁ , Xuteng Hu ₁ , Minghong Sun ₁

Affiliation

CID（电流中断设备）的工作状态对方形锂离子电池的安全性具有重要影响。导致棱柱形动力电池故障的重要因素之一是由于材料蠕变引起的CID翻转。设计了CID材料MFX2铝合金的拉伸和蠕变试验。根据实验数据，建立了电池工作温度下的各向同性硬化多线性弹塑性结构和蠕变结构。缺口检验也验证了组成。建立了CID和瓶盖的有限元模型，以分析蠕变对CID整个寿命中失效行为的影响。设计了在恒定温度和恒定负载下CID的仿真测试。仿真结果表明，该结构合理地表征了CID的基本力学性能。在CID的生命周期中，蠕变行为将首先经历快速阶段，然后进入缓慢的稳态阶段。材料的蠕变效应会导致CID提前翻倒，翻倒压力会降低，动力电池的使用寿命也会缩短。

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Study on the failure behavior of the current interrupt device of lithium‐ion battery considering the effect of creep

The working condition of the CID (current interrupt device) has an important impact on the safety of the prismatic lithium‐ion batteries. One of the important factors that causes the failure of the prismatic power battery is the overturning of CID due to material creep. The tensile and creep tests of the MFX2 aluminum alloy which is the material of CID were designed. Based on the experimental data the isotropic hardening multilinear elastic‐plastic constitution and creep constitution at the battery working temperature were established. The constitutions were also verified by the notch test. The finite element model of the CID and the cap was established to analyze the effect of creep on the failure behavior of the CID throughout life. The simulation tests in the constant temperature and constant load of CID is designed. The simulation results showed that the constitution characterizes the basic mechanical properties of the CID reasonably. During the life of the CID, the creep behavior would go through the fast stage firstly and then fall into the slow steady‐state stage. The creep effect of the material would cause the CID to overturn in advance, overturning pressure would be reduced, the life of the power battery would also be reduced.

更新日期：2020-10-16

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