磷酸铁锂电池内阻分量快速检测方法  

Quick identification of internal resistance components for lithium ion battery with LiFePO4 cathode

作　　者：潘斌[1] 董栋 钱东培 钮树强 刘双宇 姜银珠[1] PAN Bin;DONG Dong;QIAN Dong-pei;NIU Shu-qiang;LIU Shuang-yu;JIANG Yin-zhu(School of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,China;Zhejiang Huayun Imformation Technology Limited Company,Hangzhou 310008,China)

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310058 [2]浙江华云信息科技有限公司,浙江杭州310008

出　　处：《浙江大学学报（工学版）》2021年第1期189-194,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51722105).

摘　　要：为了实现锂离子电池(LIB)内阻分量快速检测,提出通过直流内阻(DCR)测试及交流内阻测试,辨识各内阻分量的方法.以磷酸铁锂电池为研究对象,分别采用Bulter-Volmer方程和二阶等效电路模型,模拟研究表征界面电荷转移、浓差极化过程等效电路的时间常数.由于电荷转移速度足够快,采用直流脉冲测试获得的瞬时响应内阻通常由欧姆内阻和电化学极化内阻组成,结合交流内阻测试仪内阻检测结果,可以计算得到电化学极化内阻分量.实验结果显示,该内阻分量测试方法不仅操作简便且具有较高的可靠性,电化学极化内阻辨识结果与电化学阻抗测试结果的最小误差小于5%.A resistance identification method was proposed by measuring direct current resistance(DCR)and alternating current(AC)resistance in order to quickly test internal resistance components of lithium ion battery(LIB).The characteristics and time constants of each resistance component were analyzed in a case study of LiFePO4(LFP)battery based on Bulter-Volmer equation and the second order equivalent circuit model.Since the charge transfer process is fast enough,the resistance corresponding to the instantaneous voltage change in DCR test generally includes Ohmic resistance and charge transfer resistance.Then the charge transfer resistance can be distinguished combined with AC internal resistance test results.Results show that the proposed method with simple operations is effective and reliable.The minimum error of the charge transfer resistance is no larger than 5%.

关 键 词：锂离子电池(LIB) 健康状态 内阻 等效电路 时间常数 

分 类 号：TM912[电气工程—电力电子与电力传动]