电磁脉冲焊接锂离子电池叠层极耳电磁力分布及运动特性  

Electromagnetic Parameters Distribution and Tabs Motion Characteristic of Electromagnetic Pulse Welding for Lithium-ion Battery Laminated Tabs

作　　者：李成祥 陈丹 周言 沈婷 米彦[1] LI Chengxiang;CHEN Dan;ZHOU Yan;SHEN Ting;MI Yan(State Key Laboratory of Power Transmission Equipment Technology,Chongqing University,Chongqing 400044,China;Chongqing College of Electronic Engineering,Chongqing 401331,China;State Grid Chongqing Bishan Power Supply Company,Chongqing 402760,China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学电气工程学院),重庆400044 [2]重庆电子工程职业学院,重庆401331 [3]国网重庆璧山供电公司,重庆402760

出　　处：《高电压技术》2025年第1期412-422,共11页High Voltage Engineering

基　　金：重庆市自然科学基金(CSTB2022NSCQ-MSX1238;CSTB2022NSCQ-MSX1504);国家自然科学基金(52207148)。

摘　　要：电磁脉冲焊接技术在锂离子电池叠层极耳连接中具有效率高、不掉粉等优势而备受关注。相较于双层工件,叠层工件电磁脉冲焊接电磁力分布与极耳运动特性更加复杂,且相互作用机制尚不明晰。为此,基于碰撞点偏移联合夹层空气分割的方法构建了叠层极耳电磁脉冲焊接过程电-磁-力多物理场耦合仿真模型,搭建了综合实验平台并开展叠层极耳焊接实验,逐层分析了电磁力分布规律和极耳运动特性。结果表明:靠近焊接线圈的极耳所受电磁力最大,且其屏蔽作用将减小其余极耳所受电磁力;各层极耳运动过程中会发生多次碰撞和反弹,仅当相邻极耳对撞焊接时才可实现焊接,且越靠近电池盖板的极耳越易对撞焊接;放电电压不会改变极耳运动特性,但会影响焊接效果。该研究可为锂离子电池叠层极耳电磁脉冲焊接效果调控与工程应用提供科学依据和实验基础。The electromagnetic pulse welding(EMPW)technology has been paid much attention in connecting lithi-um-ion battery(LIB)laminated tabs due to its advantages of high efficiency and no powder lose.Compared to double-layer workpieces,the EMPW of laminated workpieces involves a more complex electromagnetic force distribution and motion characteristics,and the interaction mechanism is not yet clear.Therefore,based on a method of collision point offset combined with interlayer air segmentation,an electric-magnetic-mechanic multi-physics field coupling simulation model of laminated tabs EMPW process was built.A comprehensive experimental platform was established to carry out EMPW experiments.The electromagnetic force distribution and the motion characteristic of tabs were analyzed layer by layer.The results showed that the electromagnetic force was the largest in the tab closest to the coil,and the shielding ef-fect reduced electromagnetic forces in other tabs.In the motion of tabs,collisions and rebounds occurred many times,and welding could only be achieved when tabs collided with each other.Moreover,tabs closer to the battery cover plate were easier to be welded.The discharge voltages did not change the motion characteristic of tabs but affect the welding effect.This study can provide a scientific basis and experimental foundation for the effect regulation and engineering applica-tions of the EMPW LIB laminated tabs.

关 键 词：电磁脉冲焊接 锂离子电池 叠层极耳 电磁力 运动特性 放电电压 

分 类 号：TM912[电气工程—电力电子与电力传动] O441.4[理学—电磁学]