三元锂离子电池中的异物金属颗粒研究  

Research on metal particles in ternary lithium-ion batteries

作　　者：徐亚杰 郑永光 郭江南 李强 袁园 苏树发 XU Yajie;ZHENG Yongguang;GUO Jiangnan;LI Qiang;YUAN Yuan;SU Shufa(SVOLT Energy Technology(Wuxi)Co.,Ltd.,Wuxi Jiangsu 214000,China)

机构地区：[1]蜂巢能源科技(无锡)有限公司,江苏无锡214000

出　　处：《电源技术》2024年第10期1985-1990,共6页Chinese Journal of Power Sources

基　　金：国家重点研发计划“新能源汽车”专项(2021YFB2501500)。

摘　　要：通过在三元体系锂离子电池中准确地植入Cu、不锈钢(SUS304)、Cr、Fe、Zn、Al颗粒,探究金属颗粒在锂电池内部的变化和差异。并对含金属颗粒锂电池长时间静置过程中的电压进行测量和分析,推测出金属颗粒可能引起电池自放电异常的临界尺寸。相对其他金属颗粒,Cu颗粒在更小的尺寸范围能够引起锂电池更高的异常自放电,需要重点关注。研究锂电池内部的金属颗粒对锂离子电池生产过程管控,评估锂离子电池性能稳定性以及应用安全性具有重要的指导意义。By accurately implanting Cu,stainless steel(SUS304),Cr,Fe,Zn and Al particles into the ternary lithium-ion battery,the changes and differences of the metal particles inside the lithium battery were studied.The voltage of the lithium batteries containing the metal particles during longterm resting was measured and analyzed,and the critical size at which the metal particles caused abnormal self-discharge of the battery was inferred.Compared with other metal particles,Cu particles in a smaller size range can cause more highly abnormal self-discharge of lithium batteries and require special attention during the battery production process.The research on the metal particles inside lithium-ion battery has important guiding significance for the management and control of lithium-ion battery production process and the evaluation of lithium-ion battery performance stability and application safety.

关 键 词：金属颗粒 短路 金属枝晶 自放电 

分 类 号：TM912.9[电气工程—电力电子与电力传动]