Quick identification of internal resistance components for lithium ion battery with LiFePO<sub>4</sub> cathode

doi:10.3785/j.issn.1008-973X.2021.01.022

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (1): 189-194 DOI: 10.3785/j.issn.1008-973X.2021.01.022

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

Bin PAN1(

),Dong DONG2,Dong-pei QIAN2,Shu-qiang NIU1,Shuang-yu LIU2,Yin-zhu JIANG1,*(

)

1. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China
2. Zhejiang Huayun Imformation Technology Limited Company, Hangzhou 310008, China

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Abstract

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%.

Key words： lithium ion battery (LIB) state of health internal resistance equivalent circuit time constant

Received: 10 June 2020 Published: 27 January 2021

CLC:

TM 912

Corresponding Authors: Yin-zhu JIANG E-mail: panbinsp@zju.edu.cn;yzjiang@zju.edu.cn

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	Bin PAN
	Dong DONG
	Dong-pei QIAN
	Shu-qiang NIU
	Shuang-yu LIU
	Yin-zhu JIANG

Cite this article:

Bin PAN,Dong DONG,Dong-pei QIAN,Shu-qiang NIU,Shuang-yu LIU,Yin-zhu JIANG. Quick identification of internal resistance components for lithium ion battery with LiFePO₄ cathode. Journal of ZheJiang University (Engineering Science), 2021, 55(1): 189-194.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.01.022 OR http://www.zjujournals.com/eng/Y2021/V55/I1/189

磷酸铁锂电池内阻分量快速检测方法

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%.

关键词： 锂离子电池（LIB）, 健康状态, 内阻, 等效电路, 时间常数

Fig.1 Schematic of current and voltage profile in direct current pulse

Fig.2 Corresponding relationship between EIS and internal resistance of lithium ion battery

Fig.3 EIS of cell with different SOC

Tab.1 EIS parameters of cell with different SOC

Fig.4 Current change in charge transfer process

Fig.5 Equivalent circuit model of lithium ion battery

Fig.6 Measurement results of DCR at different SOC

Fig.7 Fitting results of voltage relaxation process in DCR test

Tab.2 Calculation results of concentration polarization resistance by second order RC models

Fig.8 Ohmic resistance obtained by AC resistance tester and EIS

Fig.9 Activation polarization resistance identified by proposed method


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