Consistency Detection Approach for Lithium-ion Battery Pack Based on Current Characteristics of Bridging Capacitors

被引：0
|
作者：
Guo Z. [1 ]
Xiong Q. [1 ]
Liang B. [1 ]
Zhang C. [1 ]
Zhu L. [1 ]
Ji S. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Bridging capacitor currents; Consistency detection; Inconsistent cell location; Internal resistance; Lithium-ion battery; Thevenin equivalent circuit;
D O I：
10.13336/j.1003-6520.hve.20201504
中图分类号：
学科分类号：
摘要：
To meet the demands of power and energy, lithium-ion batteries in electric vehicles and energy storage systems are composed of battery cells in series and parallel. The consistency of each cell in the battery is decisive to the performance of the battery pack. It is of great significance to detect the consistency of the battery pack accurately and replace the inconsistent cell in time to improve the performance and safety of the lithium-ion battery pack. In this paper, the internal resistance is chosen as the parameter to detect the consistency of the battery pack. By bridging capacitors in battery pack, an approach to detect the consistency of the internal resistance of the battery pack is proposed based on the current characteristics of the bridging capacitors in the battery pack. The first-order Thevenin equivalent circuit of lithium-ion cell is selected to build the battery pack bridging capacitors. The characteristics of the current transmitting through the capacitors when the internal resistance of the cells at different positions are inconsistent to various degrees are simulated. Experiments are conducted to verify the effectiveness of the detecting approach. The results show that, after the bridging capacitor current characteristics in the lithium-ion battery pack are utilized, the consistency of the internal resistance of the battery pack can be accurately detected, and the location of the inconsistent cell can be located. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1933 / 1942
页数：9
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