基于差分热伏安法的锂离子电池SOH诊断  

State of health diagnosis for lithiumion batteries based on differential thermal voltammetry

作　　者：杨胜杰 罗冰洋[1] 王菁[1] 康健强[2] 朱国荣[1] YANG Shengjie;LUO Bingyang;WANG Jing;KANG Jianqiang;ZHU Guorong(Power Electronics Technology Research Institute,Wuhan University of Technology,Wuhan Hubei 430070,China;Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan Hubei 430070,China)

机构地区：[1]武汉理工大学电力电子技术研究所,湖北武汉430070 [2]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《电源技术》2021年第11期1427-1430,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51777146,51977163)。

摘　　要：当前基于容量、端电压和内阻等电特性参数的健康状态(state of health,SOH)估算模型在实际使用过程中难以真实反映电池老化状态。老化前后电池产生的热量必然存在差异,而温度也是反映SOH的关键特性参数。采用考虑电池温度的差分热伏安(differential thermal voltammetry,DTV)作为锂离子电池SOH诊断方法。分析和比较了6种电流倍率下电池DTV曲线,选取2 C和4 C倍率研究电池老化过程中的DTV特性,提取DTV峰特征参数分析电池衰退特性。接着分析峰特征参数与SOH的关联性。结果表明,4 C峰峰容量与SOH的线性关系最好,可以用于估算SOH。At present,the model of evaluating the state of health(SOH)based on electricity characteristic parameter such as capacity,terminal voltage and internal resistance,hardly reflects the real aging state of battery in the online application.The heat generated by the battery before and after aging must be different,and the temperature is also the key characteristic parameter reflecting SOH.Differential thermal voltammetry(DTV)is used as SOH diagnosis method.In the degradation,the DTV characteristic under 2 C and 4 C rates are analyzed,respectively.The feature parameters in DTV peaksare extracted to analyze battery the degradation behavior.Then,the correlation of peak feature parameters and SOH is established.Results show that 4 C peak-peak capacity has the best linear relationship with SOH,and can be used to estimate SOH.

关 键 词：锂离子电池 差分热伏安 电池健康状态 相关性分析 

分 类 号：TM912[电气工程—电力电子与电力传动]