动力电池轻度电滥用积累造成的性能和安全性劣化研究  

Investigation of the performance and safety degradation caused by slight accumulation of electricity in traction batteries

作　　者：马天翼 王芳[1] 徐大鹏 林春景[1] 刘仕强[1] 陈立铎 MA Tianyi;WANG Fang;XU Dapeng;LIN Chunjing;LIU Shiqiang;CHEN Liduo(China Automotive Technology and Research Center Co.,Ltd.,Tianjin Key Laboratory of Evaluation Technology for Electric Vehicles,Tianjin 300300,China)

机构地区：[1]中国汽车技术研究中心有限公司,天津市电动汽车评价技术企业重点实验室,天津300300

出　　处：《储能科学与技术》2020年第2期400-408,共9页Energy Storage Science and Technology

基　　金：国家重点研发计划(2018YFB0104400);天津市科技项目(18YFZCGX00240);中国汽车技术研究中心有限公司科技项目(18200116)。

摘　　要：随着车用和储能用锂离子电池能量密度的不断提高,锂离子电池在其整个生命周期的安全性已成为这项技术持续发展的关键问题。电池在使用中出现的电滥用行为对其性能和安全性具有严重影响,然而轻度电滥用积累造成的影响常常由于短时间内反馈不显著而被忽略。本文针对锂电池在电动汽车和电网储能实际使用中最可能遇到的轻度过放电现象,结合电化学测试、断层扫描分析和材料表征技术进行了"材料-电池-性能"多层级分析,并基于中子成像技术深入分析了轻度过放电积累对电池锂元素状态造成的影响。Because the energy density of lithium-ion(Li-ion) batteries for vehicles and grid storage continues to increase, the safety of Li-ion batteries throughout their life cycle has become the key issue for the continuous development of this technology. Electrical abuse behavior considerably affects the performance and safety of batteries;however, the impact of the slight accumulation of electricity is often ignored because the feedback is not considerable in the short term. This study aimed to investigate the slight over-discharge abuse, which is most likely to be encountered in the practical use of electric vehicles and grid storage, by conducting a"material-battery-performance"multi-level analysis by combining electrochemical testing, tomography analysis, and material characterization technologies. In addition, the effect of mild over-discharge accumulation on the lithium state of the battery was analyzed using neutron imaging technology.

关 键 词：锂离子电池 电滥用 轻度过放电 中子成像 电池安全性 

分 类 号：TM912[电气工程—电力电子与电力传动]