三元锂离子动力电池过充行为特性实验研究*

doi:10.19562/j.chinasae.qcgc.2019.05.015

汽车工程 ›› 2019, Vol. 41 ›› Issue (5): 582-589.doi: 10.19562/j.chinasae.qcgc.2019.05.015

三元锂离子动力电池过充行为特性实验研究^*

朱晓庆^1,2, 王震坡^1,2, 王聪^1,2, 易密³

1.北京理工大学,电动车辆国家工程实验室,北京 100081;
2.北京电动车辆协同创新中心,北京 100081;
3.广州汽车集团股份有限公司汽车工程研究院,广州 511400

收稿日期:2018-04-27 发布日期:2019-06-05
通讯作者: 王震坡,教授,博士生导师,E-mail:wangzhenpo@bit.edu.cn
基金资助:
国家自然科学基金(U1564206);国家留学基金管理委员会(201806030115)资助

An Experimental Study on Overcharge Behaviors of Lithium-ionPower Battery with LiNi_0.6Co_0.2Mn_0.2O₂ Cathode

Zhu Xiaoqing^1,2, Wang Zhenpo^1,2, Wang Cong^1,2, Yi Mi³

1.Beijing Institute of Technology, National Engineering Laboratory for Electric Vehicles, Beijing 100081;
2.Collaborative Innovation Center for Electric Vehicles in Beijing, Beijing 100081;
3.GAC Group Automotive Engineering Research Institute, Guangzhou 511400

Received:2018-04-27 Published:2019-06-05

摘要/Abstract

摘要： 本文中以电动车用额定容量为30 A·h的三元软包LiNi_0.6Co_0.2Mn_0.2O₂(NCM622)锂离子动力电池单体为研究对象,研究其在不同充电倍率条件下的行为特性。结果表明,锂离子电池过充过程可分为4个阶段;电池表面最高温度位置不是固定不变的;在大部分测试时间内,最大温差(MTD)都小于1 ℃;充电倍率对锂离子电池过充行为特性影响较大,随着充电倍率的增加,热失控最高温度和峰值电压升高,而过充测试时间和测试结束时的荷电状态(SOC)随着充电倍率的升高而降低。本研究为富镍锂离子动力电池的安全性设计和电池管理系统(BMS)对过充故障的安全管理提供了参考。

关键词: 锂离子动力电池, 过充行为, 热失控, 充电倍率

Abstract: In this paper, the overcharge behaviors of 30 A·h pouch lithium-ion battery with LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) cathode for electric vehicles are studied under different overcharge current rates (C-rates). The results indicate that the overcharge process can be divided into four stages. The highest surface temperature position of the cell is not fixed. In most test time, the maximum temperature difference (MTD) is less than 1 °C. It's worth noting that the C-rate has a great influence on the overcharge behaviors of Li-ion batteries. As C-rate increases, so do the maximum temperature and crest voltage, while the overcharge time and state of charge (SOC) value at the end of the test decrease as the C-rate increases. The study can provide a reference for the safety design of nickel-rich lithium-ion batteries and the safety management of the battery management system (BMS) for overcharge fault.

Key words: lithium-ion power battery, overcharge behaviors, thermal runaway, charging rate

朱晓庆, 王震坡, 王聪, 易密. 三元锂离子动力电池过充行为特性实验研究^*[J]. 汽车工程, 2019, 41(5): 582-589.

Zhu Xiaoqing, Wang Zhenpo, Wang Cong, Yi Mi. An Experimental Study on Overcharge Behaviors of Lithium-ionPower Battery with LiNi_0.6Co_0.2Mn_0.2O₂ Cathode[J]. Automotive Engineering, 2019, 41(5): 582-589.

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三元锂离子动力电池过充行为特性实验研究^*

An Experimental Study on Overcharge Behaviors of Lithium-ionPower Battery with LiNi_0.6Co_0.2Mn_0.2O₂ Cathode

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An Experimental Study on Overcharge Behaviors of Lithium-ionPower Battery with LiNi0.6Co0.2Mn0.2O2 Cathode

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三元锂离子动力电池过充行为特性实验研究^*

An Experimental Study on Overcharge Behaviors of Lithium-ionPower Battery with LiNi_0.6Co_0.2Mn_0.2O₂ Cathode