三元锂电池的过放电诱发内短路实验研究  

Experimental study on overdischarge induced internal short circuit of NCM batteries

作　　者：孙林[1] 郑岳久[1] 周龙[1] 李相俊[2] 周萍[1] SUN Lin;ZHENG Yue-jiu;ZHOU Long;LI Xiang-jun;ZHOU Ping(College of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;China Electric Power Research Institute(CEPRI),Beijing 100192,China)

机构地区：[1]上海理工大学机械工程学院,上海200093 [2]中国电力科学研究院,北京100192

出　　处：《电源技术》2018年第10期1454-1457,1566,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金青年基金资助课题(51507102);汽车安全与节能国家重点实验室开放基金资助(KF16022);国家电网公司科技项目(DG71-14-032)

摘　　要：设计了针对电池过放电特性的测试方法,并研究在不同的过放电程度下电池的内短路程度变化规律。结果表明:对于本实验所采用的三元锂电池,其过放电特性具有较好的一致性,其中SOC一致性比电压一致性更好;内短路的严重程度与过放电深度呈现非线性增长的关系。当本实验所采用三元锂电池过放电至-18%至-20%的SOC时,将发生不可逆的严重内短路现象,电池将表现成为一个线性电阻;而在发生严重内短路前,充电后的电池存在一个自修复的过程。A method was presented to reveal the characteristics of the overdischarged batteries.Different levels of the internal short circuit were compared at the different degrees of overdischarge.The experimental results indicate that for the same batch of the NCM batteries,the overdischarge characteristics of different battery cells are almost the same.The overdischarge characteristics of SOC consistency is better than that of voltage consistency.The relationship between the levels of overdischarge and the severity of the internal short circuit exhibits a nonlinear growth.The irreversible critical internal short circuit would happen when the NCM lithium batteries were overdischarge between-18%to-20%of the SOC,and the severe irreversible internal short circuit would occur,and the batteries would behave as a resistance.The NCM batteries would have self-healing process during charging before the serious internal short circuit.

关 键 词：三元锂电池 过放电特性 内短路 内短路电阻 实验研究 

分 类 号：TM912[电气工程—电力电子与电力传动]