大容量锂电池模组过充热失控分析
Analysis of Large Capacity Power Battery Module Overcharge Thermal Runaway
宋毓聪 1郭跃 1崔佳斌 1宋冬冬 1杨洪宇1
作者信息
- 1. 中汽研汽车检验中心(常州)有限公司 江苏省常州市 213000
- 折叠
摘要
为提高动力电池的安全性,降低热失控的风险,以某款标称容量为 166Ah的大容量锂电池模组作为研究对象,在常温25℃试验环境下,利用充放电测试系统以1/5C恒流对电池模组进行过充电热失控试验,研究其过充电热失控的反应特点和行为特性.结果表明:在常温 25℃试验环境下,该电池模组充电至154%SOC,发生热失控行为.过充热失控反应存在明显的演变过程,热失控发生前电芯一致性变差,内部电压的下降时间超前于模组的热失控异常升温时间,对热失控进行预警.
Abstract
In order to improve the safety of power batteries and reduce the risk of thermal runaway,a large-capacity lithium battery module with a nominal capacity of 166Ah was taken as the research object,in the normal temperature test environment,the overcharge thermal runaway test was carried out on the battery module with a constant current of 1/5C using a charge-discharge test system to study the characteristics of charge thermal runaway reaction and behavior.The results show that thermal runaway occurs when the battery module is charged to 154%SOC at ambient temperature.There is an obvious evolution process of overcharge thermal runaway reaction.The consistency of cells become worse before the thermal runaway occurs,and the decline time of the internal voltage is ahead of the abnormal temperature rise time of the thermal runaway of the module,so as to give an early warning of the thermal runaway.
关键词
锂电池模组/过充电/反应特点/行为特性Key words
Lithium battery module/Overcharge/Reaction characteristic/Behavior characteristics引用本文复制引用
基金项目
常州市科技支撑计划(CE20220020)
出版年
2024
NETL
NSTL
万方数据