摘要
由锂离子电池热失控引发的各类安全问题是目前电动汽车和大规模储能电站继续推广的一大瓶颈。电、热滥用是引发电池热失控的关键原因,研究锂离子电池的热失控现象对保证锂离子电池安全运行意义重大。基于锂离子电池热失控模型,系统研究了充电倍率、环境温度和散热条件等因素对锂离子电池热失控过程中电、热响应特性的影响。结果表明,相较于常温下的过充热失控过程,在过充-过热耦合作用下,电池热失控SOC会有所降低,当处于极端高温环境时,热失控在电池未充满阶段即可发生。在过热及低表面换热环境下,充电倍率对电池热失控SOC影响不大;在过热及自然对流环境下,随着充电倍率增加,电池热失控SOC提高,热失控时间提前。本研究为可靠的电池安全预警技术开发提供了支持。
At present,the safety problem caused by thermal runaway(TR)of lithium-ion batteries(LIBs)has been the bottleneck for the promotion of electric vehicles and large-scale energy storage stations.To tackle this problem,great efforts have been made to study the TR characteristics of LIBs.The electrical abuse and the thermal abuse are two key reasons that induce the TR.In this paper,based on the TR model,the electrical and thermal response of LIB are systematically studied under different abuse conditions.Three influencing impacts are comprehensively investigated,including charging rate,ambient temperature and heat dissipation.These results show that compared with the TR induced by the overcharge,the TR would occur at lower SOC under the combined overcharge and overheating condition.In the face of extreme high temperature environment,the TR could even occur at the early charge stage.Moreover,under the overheat condition with low surface heat transfer coefficient,the charging rate has little effect on trigger SOC of thermal runaway;While under the overheat condition with natural convection condition,the thermal runaway would occur at higher SOC with the increase of charging rate,but the thermal runaway time would be reduced.This study provides support for the development of reliable battery safety early warning technology.
作者
许金龙
沈佳妮
王乾坤
贺益君
马紫峰
谈文
杨庆亨
XU Jinlong;SHEN Jiani;WANG Qiankun;HE Yijun;MA Zifeng;TAN Wen;YANG Qingheng(Department of Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Pylontech Energy Technology Co.Ltd.,Shanghai 201203,China)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2021年第4期1344-1352,共9页
Energy Storage Science and Technology
基金
国家自然科学基金项目(21978166)。
关键词
锂离子电池
过充
过温
热失控模型
电热耦合滥用
lithium-ion battery
overcharge
overheat
thermal runaway model
electrothermal coupling abuse
作者简介
第一作者:许金龙(1993-),男,硕士研究生,研究方向为电池安全性,E-mail:jinlongxu1@163.com;通信作者:贺益君,博士,教授,研究方向为电化学能源系统、石油化工过程等复杂系统的建模、优化与控制,E-mail:heyijun@sjtu.edu.cn。
