圆柱形锂离子动力电池卷绕过程中的应力分析  

Stress Analysis of Cylindrical Lithium Ion Power Battery during Winding Process

作　　者：陈敬宜[1,2] 王根伟 宋辉[1,2] 雷建银[1,2] 吴桂英 CHEN Jingyi;WANG Genwei;SONG Hui;LEI Jianyin;WU Guiying(Shanxi Key Laboratory of Material Strength and Structure Impact,Taiyuan University of Technology,Taiyuan 030024,China;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;College of Aeronautics and Astronautics,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]太原理工大学山西省材料强度与结构冲击重点实验室,太原030024 [2]太原理工大学机械与运载工程学院,太原030024 [3]太原理工大学航空航天学院,山西晋中030600

出　　处：《太原理工大学学报》2023年第2期280-289,共10页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(11872265);山西省自然科学基金资助项目(201901D111087)。

摘　　要：在锂离子动力电池的制造过程中,卷绕是极为关键的一道工序。为了保证电池的安全稳定,卷绕过程中不能产生弯折、褶皱,甚至断裂。电池型号不同,适合的卷绕方式不同,最适合的卷绕方式可以根据卷芯成品外半径来确定。首先,把电池卷绕层作为薄膜材料,在卷绕张力的约束下对卷芯的本构方程进行分析,得到平面应变状态下卷芯内r处的环向应力分布函数和径向应力分布函数;进而得到卷绕n圈完成后,卷芯内任意r处的环向应力和径向应力。根据卷绕张力的类型,对不同卷芯外半径下的环向应力进行算例分析,从而得到适合不同卷绕外半径的卷绕方式。随着卷绕外半径的不断增大,恒卷绕张力和锥度卷绕张力逐渐不适合电池卷芯的卷绕,因此提出了全新的抛物线型卷绕张力和复合型卷绕张力。动力电池卷绕完成后,电池卷芯经卷绕产生的应力相当于对电池施加的预应力,从而对动力电池的使用产生影响。In the manufacturing process of lithium-ion power battery, winding is a very critical process. In order to ensure the safety and stability of the battery, no buckling, wrinkling, and even fracture is allowed in the process of winding. Different battery models lead to different winding methods for the jellyroll. The most suitable winding method is determined by the external radius of the jellyroll. First, the winding layer is treated as a thin-film material, the constitutive equation of jellyroll is established by considering the constraint of winding tension to obtain hoop stress and radial stress distribution function at the place of r under plane strain state. The hoop stress and the radial stress at any place of r inside the jellyroll are obtained at the end of n coils. Moreover, the hoop stresses of the jellyrolls with different external radius are analyzed by calculating examples according to the type of winding tension, and the suitable winding methods for different external radius are suggested. With the increase of the external radius of jellyroll, the constant winding tension and taper winding tension are gradually no longer suitable, and the parabolic winding tension and compound winding tension are proposed. After the winding of the power battery is completed, the stress generated by the winding tension of jellyroll is equivalent to the prestress applied to the battery, which will affect the use of the power battery.

关 键 词：锂离子动力电池 平面应变状态 应力分布 卷绕张力 环向应力 

分 类 号：O39[理学—工程力学]