商用钴酸锂电池过充电安全性研究  

Study on overcharge safety of commercial lithium cobalt oxide battery

作　　者：张青松[1] 赵启臣 ZHANG Qingsong;ZHAO Qichen(Aircraft Fire and Emergency Research Institute,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学飞机防火与应急研究所,天津300300

出　　处：《电源技术》2021年第3期286-288,316,共4页Chinese Journal of Power Sources

基　　金：民航安全能力建设项目资助(TRSA-20600726);中央高校基本科研业务费中国民航大学专项资助(3122018D043)。

摘　　要：过充电是锂离子电池最常见和最危险的失效方式之一,探究锂电池过充电过程中的行为特性与安全性变化至关重要。从充电速率与截止电压两个方面,研究了不同实验条件下商用钴酸锂电池的过充电安全性。结果表明:充电速率对钴酸锂电池过充测试中电池表面温度的峰值影响较大。随着充电速率的增加,锂离子电池的温升更严重,电池故障所需时间更短;随着过充截止电压的升高,钴酸锂电池内部会发生副反应,导致电池表面温度出现第二次峰值,进而对电池造成不可逆损伤。在高速率充电(3 C)时截止电压对电池峰值温度影响较大,而在中低速率(2 C及以下)时不易受截止电压影响。可为钴酸锂电池的安全性设计和电池管理系统中过充故障的安全管理提供理论依据与技术参考。Overcharge is one of the most common and dangerous failure modes of lithium ion batteries.The overcharge safety of commercial lithium cobalt oxide batteries under different experimental conditions was studied from two aspects of charging rate and cut-off voltage.The results show that the charging rate has a great influence on the peak of surface temperature of lithium cobalt oxide battery in the overcharge test.With the increase of charging rate,the temperature rise of li-ion battery was more serious and the time for battery failure was shorter.With the increase of overcharge cut-off voltage,side reactions would occur in lithium cobalt oxide batteries,leading to the second peak of battery surface temperature,and thus causing irreversible damage to the battery.When charging at a high rate(3 C),the cut-off voltage had a great influence on the peak temperature of the battery,while when charging at a low rate(2 C or below),the cut-off voltage was not easily affected.Theoretical basis and technical reference for safety design of lithium cobalt oxide battery and safety management of overcharge fault in battery management system could be provided by this study.

关 键 词：锂离子电池 过充电 安全性 充电速率 截止电压 

分 类 号：TM912[电气工程—电力电子与电力传动]