摘要
为研究锂离子电池在局部高温下的热失控特征,在COMSOL软件中,建立了锂离子电池热-化学耦合模型。该模型包含5种副反应:固体电解质界面膜分解反应、负极活性物质与电解液之间的反应、正极活性物质与电解液之间的反应、电解液分解反应、粘接剂分解反应。利用该模型,分析了局部高温对锂离子电池各副反应的产热情况和隔膜温度分布的影响规律。结果表明:仅对单个极耳加热时,不会引起电池内部的热失控;当对锂离子电池两端极耳同时加热时,5种副反应均产生热量,这导致触发电池热失控现象;热失控在锂离子电池内部先沿水平方向传播,然后沿垂直方向传播。
A thermal-chemical coupling model of lithium-ion batteries was established in a COMSOL software to investigate the thermal runaway characteristics of lithium-ion batteries at local high temperatures.The model contains five side reactions:the solid electrolyte interface membrane decomposition reaction,the reaction between negative electrode active material and electrolyte,the reaction between positive electrode active material and electrolyte,the electrolyte decomposition reaction,and the binder decomposition reaction.By using this model analyzed the influence of local high temperature on the heat generation of the side reactions of the lithium-ion battery and the temperature distribution of the diaphragm.The results show that heating only a single tab does not cause thermal runaway inside battery;All the five side-reactions generates heat when heating simultaneously both ends of lithium-ion battery tabs,this phenomenon will lead to trigger battery thermal runaway;Thermal-runaway inside lithium-ion battery propagates firstly in the horizontal direction and then in the vertical direction.
作者
徐晓明
袁秋奇
张扬军
胡昊
XU Xiaoming;YUAN Qiuqi;ZHANG Yangjun;HU Hao(School of Automobile and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China;School of Vehicle and Delivery,Tsinghua University,Beijing 100083,China)
出处
《汽车安全与节能学报》
CAS
CSCD
2020年第3期388-396,共9页
Journal of Automotive Safety and Energy
基金
国家自然科学基金面上项目(51875259)
国家重点研发计划(2018YFC0810504)
汽车仿真与控制国家重点实验室开放基金(20180103)
清华大学实验室开放基金项目(KF1819)。
关键词
动力电池
锂离子电池
极耳
热失控
局部加热
副反应
固体电解质界面(SEI)膜
power batteries
lithium-ion batteries
electrode tab
thermal runaway
local heating
side reactions
solid electrolyte interface(SEI)film
