电极表面不平整性对锂电池短路触发行为的影响

贾亦楷 刘子敬 黄庆丹 王璐冰

贾亦楷, 刘子敬, 黄庆丹, 王璐冰. 电极表面不平整性对锂电池短路触发行为的影响[J]. 爆炸与冲击. doi: 10.11883/bzycj-2024-0339
引用本文: 贾亦楷, 刘子敬, 黄庆丹, 王璐冰. 电极表面不平整性对锂电池短路触发行为的影响[J]. 爆炸与冲击. doi: 10.11883/bzycj-2024-0339
JIA Yikai, LIU Zijing, HUANG Qingdan, WANG Lubing. Effect of surface roughness of lithium-ion battery electrodes on short-circuit triggering behaviors[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0339
Citation: JIA Yikai, LIU Zijing, HUANG Qingdan, WANG Lubing. Effect of surface roughness of lithium-ion battery electrodes on short-circuit triggering behaviors[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0339

电极表面不平整性对锂电池短路触发行为的影响

doi: 10.11883/bzycj-2024-0339
基金项目: 国家自然科学基金(12402463);冲击与安全工程教育重点实验室(宁波大学)开放课题(CJ202402)
详细信息
    作者简介:

    贾亦楷(1994- ),男,博士,教授,yjia3@nwpu.edu.cn

  • 中图分类号: O383

Effect of surface roughness of lithium-ion battery electrodes on short-circuit triggering behaviors

  • 摘要: 锂离子电池遭受外部冲击时内部隔膜的形变和失效是引发内部短路的关键因素之一。电池电极表面通常并不平整,易造成隔膜应力集中,影响电池的机械稳定性。因此,本研究基于数值模拟和理论分析,针对电池隔膜在非平整表面压缩条件下的力学行为及其短路安全边界进行了深入探讨。选取包括一段宽度为50 μm的隔膜及其附近的正负极涂层区域作为代表性单胞进行二维有限元建模与数值计算。通过分析隔膜等效应力-应变曲线发现受到不平整表面压缩的隔膜相比于理想平面压缩表现出“软化现象”,随着加载的进行,加载面和隔膜之间的空隙逐渐被填充,非平整面和平整面压缩的载荷差异逐渐减小。通过对隔膜失效应力的参数化分析,发现随着颗粒直径的增加、隔膜厚度的减小或一定范围内的加载速率增加,隔膜表现出平均应力降低、屈服点后移等行为,短路失效应力也随之减小。进一步的,通过建立隔膜在非平整表面压缩下的等效压缩本构模型,从理论上解释了粗糙度对失效应力的影响,并推导出了二者的定量关系。
  • 图  1  锂电池的碰撞短路失效问题

    Figure  1.  The collision-induced internal short-circuit in lithium-ion batteries

    图  2  隔膜压缩加载工况建模方法

    Figure  2.  Modeling methods for separator compression loading conditions

    图  3  边界条件设置

    Figure  3.  Boundary condition setups

    图  4  不同加载条件下隔膜的等效应力-应变曲线及应变分布

    Figure  4.  Equivalent stress-strain curves and strain distribution of the separator under different loading conditions

    图  5  不同颗粒尺寸下隔膜的力学行为及短路失效应力

    Figure  5.  The mechanical behavior and short-circuit failure stress of the separator under different particle sizes

    图  6  不同厚度隔膜的力学行为及短路失效应力

    Figure  6.  The mechanical behavior and short-circuit failure stress of the separator under different separator thickness

    图  7  不同加载速率下隔膜的力学行为及短路失效应力

    Figure  7.  The mechanical behavior and short-circuit failure stress of the separator under different loading rates

    图  8  考虑电极表面粗糙度的隔膜压缩本构模型的建立

    Figure  8.  Establishment of the constitutive model for the separator compression considering the roughness of the electrode surface

    图  9  理论曲线与数值模拟曲线比对

    Figure  9.  Comparison between theoretical curves and numerical simulation curves.

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出版历程
  • 收稿日期:  2024-09-13
  • 修回日期:  2024-11-05
  • 网络出版日期:  2024-11-07

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