基于平均电压快速识别锂离子电池老化模式  

In-operation diagnosis method for degradation modes of lithium-ion battery based on average voltage

作　　者：刘秀兰 张倩 王瑾瑜 陈熙 陈慧敏 关宇 LIU Xiulan;ZHANG Qian;WANG Jinyu;CHEN Xi;CHEN Huimin;GUAN Yu(State Grid Beijing Electric Power Research Institute,Beijing 100075,China;School of Electrical and Electronic Engineering,North China Electric Power University(Beijing),Beijing 102206,China;School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100075 [2]华北电力大学(北京)电气与电子工程学院,北京102206 [3]北京交通大学电气工程学院,北京100044

出　　处：《电源技术》2024年第2期263-268,共6页Chinese Journal of Power Sources

基　　金：充放电设备性能及器件互换性检测关键技术研究及装置开发(5400-202211163A-1-1-ZN)。

摘　　要：锂离子电池在老化过程中表现为非线性衰退,这会危及新能源汽车或储能系统的安全。提出了一种基于实车使用或储能系统使用的原位快速识别老化模式的方法,该方法仅需要80%放电深度(DOD)区间的电压、电流数据。通过建立的老化模型模拟了27种老化模式,该模型可通过扩展平均电压与容量衰退的轨迹快速识别非线性衰退的老化模式。证明了电池的非线性衰退与负极材料损失或锂离子损失增加有关,并且扩展平均电压的轨迹可判断正极材料损失是否加速衰退。采用正负极匹配的无损老化模式诊断验证了方法的准确性。Li-ion batteries exhibit nonlinear degradation during aging,which can endanger the safety of new energy vehicles or energy storage systems.An in-operation diagnosis method for degradation modes was proposed for vehicle or energy storage systems,which only required voltage and current within 80%DOD.27 aging modes were simulated by the established aging model,which could quickly identify the non-linearly degradation aging mode by the extended average voltage and capacity degradation trajectory under the condition of linear increase of internal resistance.It's demonstrated that the nonlinear degradation of the battery is related to the increase of anode material loss or lithium ion loss,and that the trajectory of the extended average voltage can determine whether the cathode material loss accelerates the degradation.The accuracy of the method was verified by the undamaged daging mode diagnosis with cathode and anode matching.

关 键 词：锂离子电池 平均电压 非线性衰退 老化机理 

分 类 号：TM912.9[电气工程—电力电子与电力传动]