基于膜力因子法的方形锂离子电池冲击动力响应研究  

Impact Responses of Prismatic Lithium-Ion Battery Based on the Membrane Factor Method

作　　者：张新春[1] 王俊瑜 汪玉林 黄子轩 王凯[2] 覃江毅 ZHANG Xinchun;WANG Junyu;WANG Yulin;HUANG Zixuan;WANG Kai;QIN Jiangyi(Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding,Hebei 071003,P.R.China;Unmanned Systems Research Center,National Innovation Institute of Defense Technology,Academy of Military Sciences,Beijing 100010,P.R.China)

机构地区：[1]华北电力大学河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003 [2]军事科学院国防科技创新研究院无人系统技术研究中心,北京100010

出　　处：《应用数学和力学》2022年第11期1203-1213,共11页Applied Mathematics and Mechanics

基　　金：河北省自然科学基金(A2020502005);中央高校基本科研业务费(2020MS113)。

摘　　要：针对锂离子电池在冲击载荷下的大变形短路问题,首先建立了方形电池的简化模型,基于膜力因子法推导出电池在冲击载荷下的速度和位移运动方程.考虑到外壳厚度和芯材密度的因素,具体研究了方形锂离子电池的冲击动力响应特性.研究表明,通过引入膜力因子法改进的运动方程能够反映电池在冲击载荷下的动态响应机制,预测高速冲击下方形电池的大挠度变形.锂离子电池下部外壳的变形随电池外壳厚度的增加而减小,而电池芯材密实区域随外壳厚度的增加而增加.电池下部外壳的变形和密实区域均随电池内芯密度增加而增大.该文所提出的冲击模型可为方形锂离子电池的动力学性能多功能一体化设计提供理论参考.Aimed at the internal short circuit problem due to large deformation of the prismatic lithium-ion battery cell under impact loadings,a simplified battery model was first established.Then the motion equations of velocity and displacement based on the membrane factor method were proposed.With the effects of the face-sheet thickness and the densification region on the normalized final deflection,impact response characteristics of prismatic battery cells were investigated in detail.The results show that,the improved motion equations involving the membrane factor can reflect the dynamic response mechanisms of the prismatic battery cell under impact loadings,and the large deflection under high-speed impact can be predicted.With the increase of the face-sheet thickness,the deflection of the battery cell’s lower part decreases obviously.However,the densification region expands with the face-sheet thickness.The deflection and the densification region of the cell’s lower part both increase with the inner core density of the battery.This proposed impact model provides a theoretical guidance for the multi-functional integrated dynamic design of prismatic battery cells.

关 键 词：方形锂离子电池 冲击响应 膜力因子法 运动方程 

分 类 号：U469.72[机械工程—车辆工程]