基于锂电池等效电路模型的阻抗曲线拟合算法  

A novel impedance curve fitting algorithm for lithium batteries

作　　者：黄海宏[1] 汪宇航 王海欣[1] Huang Haihong;Wang Yuhang;Wang Haixin(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《仪器仪表学报》2021年第8期70-77,共8页Chinese Journal of Scientific Instrument

基　　金：安徽省科技重大专项项目(18030901064)资助。

摘　　要：近些年利用电池阻抗谱(EIS)估算锂电池状态的研究取得了较大进展。本文提出了一种EIS等效电路模型参数提取算法,用于分析提取不同状态下的电池等效电路参数,具有简单、不易发散的优点。首先通过结合模型的物理意义计算获得等效电路模型参数初值,然后利用等效电路与EIS之间的映射关系进行迭代,从而实现了参数的提取。对比理论参考值,提取的关键参数的误差低于4.4%。为了获得锂电池在不同荷电状态下的EIS数据,利用电化学工作站在恒温状态下测量选用的磷酸铁锂电池,利用算法编写的软件实现等效电路参数的提取。通过对比不同荷电状态下的等效模型参数,在一定程度上验证了利用EIS快速估计锂电池状态的可行性。In recent years,the great progress has been achieved in the estimation of lithium battery state using the electrochemical impedance spectroscopy(EIS).In this paper,an EIS equivalent circuit model parameter extraction algorithm is proposed to analyze the battery equivalent circuit parameters in different states,which has advantages of simplicity and good convergence.Firstly,the initial values of equivalent circuit model parameters are obtained by combining the physical meaning of the model.The mapping relationship between the equivalent circuit and EIS is used for iteration to extract parameters.Compared with the theoretical reference value,the error of the key parameter is less than 4.4%.To obtain the EIS data of lithium-ion battery under different states of charge,the electrochemical workstation is used to measure the EIS data of lithium-ion phosphate battery under constant temperature.Finally,by comparing the equivalent model parameters under different states of charge,the feasibility of using EIS to quickly estimate the state of lithium battery is verified to a certain degree.

关 键 词：磷酸铁锂电池 曲线拟合 阻抗谱 等效电路 

分 类 号：TH89[机械工程—仪器科学与技术] TM93[机械工程—精密仪器及机械]