方形锂离子电池内芯层集式模型方法及细观变形失效分析

doi:10.3901/JME.2021.18.229

机械工程学报 ›› 2021, Vol. 57 ›› Issue (18): 229-239.doi: 10.3901/JME.2021.18.229

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方形锂离子电池内芯层集式模型方法及细观变形失效分析

李志杰^1,2, 陈吉清^1,2, 兰凤崇^1,2, 周云郊^1,2

1. 华南理工大学机械与汽车工程学院广州 510640;
2. 广东省汽车工程重点实验室广州 510640

收稿日期:2020-11-30 修回日期:2021-03-25 出版日期:2021-09-20 发布日期:2021-11-30
通讯作者: 周云郊(通信作者),男,1982年出生,博士,讲师。主要研究方向为车身结构轻量化、新能源汽车动力电池、汽车产业经济与政策等。E-mail:mezhouyj@scut.edu.cn
作者简介:李志杰,男,1986年出生,博士研究生。主要研究方向为新能源汽车锂电池安全。E-mail:heaton_lzj@163.com
基金资助:
国家重点研发计划资助项目（2018YFB0104100）。

Internal Layer-stacking Model Method of Prismatic Lithium-ion Batteries and Mesoscale Failure Analysis

LI Zhijie^1,2, CHEN Jiqing^1,2, LAN Fengchong^1,2, ZHOU Yunjiao^1,2

1. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640;
2. Guangdong Provincial Key Laboratory of Automotive, Guangzhou 510640

Received:2020-11-30 Revised:2021-03-25 Online:2021-09-20 Published:2021-11-30

摘要/Abstract

摘要： 方形锂电池内芯的变形失效是引发内部短路和热失控的主要因素。根据方形锂电池内部组分材料的力学试验，构建隔膜-正极-隔膜-负极相互堆叠的细观芯层单元模型。通过不同载荷条件下的模拟结果可知，芯层单元模型能够有效地表征宏观力学响应和细观变形失效。进一步构建芯层单元模型连接均质化模型的层集式耦合模型，并且定义了模型的计算架构。通过方形锂电池实例模拟的结果表明，层集式模型能较好地预测局部载荷下的力-位移曲线和内部短路位置。此外，层集式模型在不同的隔膜材料模型下出现了不同的峰值载荷。该建模方法不仅提升了精细化模型75%的计算效率，还增加了机械内部失效方面的深入理解，对于提高方形锂电池安全性设计有指导意义。

关键词: 方形锂电池, 力学响应, 变形失效, 细观芯层单元, 层集式模型

Abstract: The deformation failure of the interior of the prismatic lithium-ion cell is the main factor leading to internal short circuit and thermal runaway. Based on the mechanical tests of the internal components of prismatic lithium-ion cell, a mesoscale layered element model of separator, cathode, separator, anode stacking was constructed. The simulation results under different loading conditions show that the layered element model can effectively characterize the macroscale mechanical response and mesoscale deformation failure. Furthermore, a layer-stacking coupling model is constructed by connecting the layered element model with the homogenization model, and the computing architecture of the model is defined. The simulation results of the prismatic lithium-ion cell show that the layer-stacking model can predict the force-displacement curve and internal short circuit under local load. In addition, different peak loads appear in the layer-stacking model with different separator material models. This modeling method not only improves the calculation efficiency of the refined model by 75%, but also increases the in-depth understanding of the mechanical internal failure, which has guiding significance for improving the safety design of prismatic lithium-ion cell.

Key words: prismatic lithium-ion cell, mechanical response, deformation failure, mesoscale layered element, layer-stacking model

中图分类号:

TG156

李志杰, 陈吉清, 兰凤崇, 周云郊. 方形锂离子电池内芯层集式模型方法及细观变形失效分析[J]. 机械工程学报, 2021, 57(18): 229-239.

LI Zhijie, CHEN Jiqing, LAN Fengchong, ZHOU Yunjiao. Internal Layer-stacking Model Method of Prismatic Lithium-ion Batteries and Mesoscale Failure Analysis[J]. Journal of Mechanical Engineering, 2021, 57(18): 229-239.

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方形锂离子电池内芯层集式模型方法及细观变形失效分析

Internal Layer-stacking Model Method of Prismatic Lithium-ion Batteries and Mesoscale Failure Analysis

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