An Experimental Study on Influencing Factors of Internal Resistance in Lithium Power Battery

被引：0

作者：

Kou Z. ^{[1
,2
]}

Hua M. ^{[1
,2
]}

Ji H. ^{[1
,2
]}

Pan X. ^{[1
,2
]}

机构：

[1] College of Safety Science and Engineering, Nanjing Tech University, Nanjing

[2] Jiangsu Key Laboratory of Urban and Industrial Safety, Nanjing

来源：

Qiche Gongcheng/Automotive Engineering | 2017年 / 39卷 / 05期

关键词：

Battery internal resistance; Depth of discharge; Discharge rate; Lithium-ion power battery;

D O I：

10.19562/j.chinasae.qcgc.2017.05.003

中图分类号：

学科分类号：

摘要：

The internal resistance of lithium-ion power battery is one of the important parameters in evaluating the performance of batteries for electric vehicles. In this paper, the law of the change of battery internal resistance with the changes of ambient temperature, discharge rate and the depth of discharge are studied. The results show that the relationship between battery internal resistance and cycle number follows power index function, while that between the changing rate (with cycle number) of battery internal resistance and ambient temperature is close to quadratic function. When temperature is 20℃, both battery internal resistance and its changing rate reaches minimum. The changing rate of battery internal resistance increases with the rise of discharge rate, and it hardly changes with cycle number at a discharge rate of 1C, while apparently increases with the rise of cycle number when discharge rate is 1.5C or 2C. The curves of the changing rate of battery internal resistance versus cycle number are rather close to each other for discharge depth of 25% and 50%, but the curve rapidly rise when discharge depth reaches 100%. In single cycle discharge, the change of battery internal resistance with discharge depth is relatively small when the depth of discharge is below 80%, and it rapidly increases when the depth of discharge exceeds 80%. © 2017, Society of Automotive Engineers of China. All right reserved.

引用

页码：503 / 508and516

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