摘要
为研究锂离子电池温升所产生的热应力和形变分布,建立了快充条件下18650锂离子电池的热模型,仿真得到不同环境温度下电池的温度场分布,并在此基础上建立顺序热-力耦合模型,进一步分析电池的热应力和形变分布。结果表明:随着环境温度增加,电池最高温度增大,温差减小,充电末期电池温度稍有下降且降幅随环境温度增加而减小;最大应力值出现在电池柱面外边中间部分,最小应力分布在轴向两端;最大形变分布在电池轴向两端,最小形变出现在电池中心区域;电池的应力和形变随环境温度增加分别呈减小和增大趋势。
To study the thermal stress and deformation distribution generated by temperature rise in Li-ion batteries,the thermal model of the battery under fast charging condition was established,and the temperature field distribution of the battery under different ambient temperature was simulated.A sequential thermo-mechanical coupling model was set up to analyze the distribution of thermal stress and total deformation of the battery.Results show that with the increase of ambient temperature,the maximum temperature of the battery increase,and the temperature difference decrease.The battery temperature drop slightly at the end of charging,and the amount of drop decrease with the increase of ambient temperature.The maximum stress value appears in the middle of the outer edge of the battery cylinder,and the minimum at both ends of the axial direction of the battery.The maximum deformation occurred at both ends of the axial direction of the battery,and the minimum in the central area of the battery.The stress and total deformation of the battery decrease and increase,respectively,with the increase of ambient temperature.
作者
田晟
肖佳将
TIAN Sheng;XIAO Jia-jiang(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)
出处
《科学技术与工程》
北大核心
2021年第7期2725-2729,共5页
Science Technology and Engineering
基金
广东省自然科学基金(2020A1515010382)
国家留学基金(201706155003)
广东省科技计划(2015A080803001)。
关键词
锂离子电池
热-力耦合
温度场
热应力
形变
Li-ion battery
thermo-mechanical coupling
temperature field
thermal stress
deformation
作者简介
第一作者:田晟(1969-),男,汉族,江西九江人,博士,副教授。研究方向:新能源汽车技术。E-mail:shitian1@scut.edu.cn。
