基于电化学阻抗谱的锂离子电池荷电状态估计  

State of charge evaluation for lithium-ion battery via electrochemical impedance spectroscopy

作　　者：李超凡 杨林[1] LI Chaofan;YANG Lin(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《电源技术》2024年第12期2404-2409,共6页Chinese Journal of Power Sources

基　　金：上海汽车工业科技发展基金会资助项目(2308);山东省重点研发计划项目(2023CXGC010210)。

摘　　要：锂离子电池的电化学阻抗谱包含了丰富的电池内部信息,相较于常用的电流、电压和温度等电池参数具有更大的应用潜力。因此,提出了一种基于电化学阻抗谱对电池的荷电状态进行估计的方法。首先,通过实验并借助更具实用价值的阻抗测量板获得了三元锂电池在不同荷电状态下的阻抗数据;其次,在现有锂离子电池等效电路模型的基础上,提出了新的拟合精度更高的等效电路模型;最后,利用电池的阻抗谱数据对提出的等效电路模型进行参数辨识,从中找到了与电池荷电状态高度相关的参数,成功实现了对其荷电状态的准确估计。The electrochemical impedance spectroscopy(EIS)of Li-ion battery(LIB)contains abundant internal information of the LIB,which has greater application potential than the commonly used battery parameters such as current,voltage and temperature.Therefore,a method based on EIS to estimate the LIB's state of charge(SOC)was proposed in this paper.Firstly,the EIS data of ternary LIBs under different SOC were obtained through experiments,using a more practical impedance measuring board.Secondly,based on the existing LIB’s equivalent circuit models(ECMs),a new ECM with higher fitting accuracy was proposed.Finally,the parameters of the improved ECMwere identified by using the EIS data of the LIBs and the parameter highly related to the SOC was found.By using this parameter,the accurate estimation of the state of charge was successfully realized.

关 键 词：电化学阻抗谱 等效电路模型 荷电状态估计 阻抗测量板 

分 类 号：TM912[电气工程—电力电子与电力传动]