Micro Short Circuit Diagnosis Method of Battery Pack Based on Capacity Increment Curve and Charge Capacity Difference

被引：0
|
作者：
Zhang J. [1 ]
Gao X. [1 ]
Zhang L. [1 ]
机构：
[1] College of Electrical Engineering, Dalian University of Technology, Dalian
来源：
Qiche Gongcheng/Automotive Engineering | 2023年 / 45卷 / 02期
关键词：
charge capacity difference（DCC）; charge capacity increment（IC）; lithium-ion battery; micro-short-circuit diagnosis;
D O I：
10.19562/j.chinasae.qcgc.2023.02.004
中图分类号：
学科分类号：
摘要：
At present，there is no effective method to identify and detect the micro short circuit of lithium-ion battery in the early evolution stage. Therefore，this paper proposes a micro short circuit diagnosis method based on the change law of battery charge capacity increment（IC）curve and charge capacity difference（DCC）. Firstly，the relationship between lithium battery short circuit fault and charge capacity increment is established. The IC curves are denoised by using wavelet transform，and the unique correspondence between the peak value of IC curve （ICPV）and the state of charge（SOC）of battery is obtained under different current rates and temperature. Then，DCC is proposed to be used to describe the SOC difference between the faulty battery with internal short circuit and the normal battery，and the quantitative method of lithium battery micro short circuit is obtained. Finally，simulation analysis and experiments show that the quantitative information of battery micro short circuit can be obtained under different cycling conditions，and the maximum errors of fault diagnosis are less than 8.12%. © 2023 SAE-China. All rights reserved.
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页码：191 / 198and230
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