Two-mode cell balancing circuit with adjustable balancing threshold

被引：0
作者：
Xu P. [1 ]
Kang L. [1 ]
Wan L. [1 ]
Xie D. [2 ]
机构：
[1] Electric Power College, South China University of Technology, Guangzhou
[2] Guangdong Hynn Technology Co., Ltd, Dongguan
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2023年 / 27卷 / 10期
关键词：
balancing speed; balancing threshold; cell balancing circuit; control strategy; two-mode; zero-current switching;
D O I：
10.15938/j.emc.2023.10.010
中图分类号：
学科分类号：
摘要：
Cell balancing circuit plays an important role in improving internal consistency, capacity utilization and life span of series battery pack. In view of the limitations of the existing single-mode balancing circuit, this paper proposes a two-mode cell balancing circuit based on quasi-resonant switching capacitor and complementary three-resonant- state LC converter. The circuit can switch between any cell to any cell (AC2AC) mode and direct cell to cell (DC2C) mode according to the voltage distribution, and the two modes can both realize zero-current switching, and circuit loss reduction. To obtain the optimal balancing speed, a balancing circuit control strategy with double thresholds is proposed. This paper analyzed the operating states, balancing power, and balancing efficiency of two balancing modes, and the experimental prototype of four cells was built to conduct balancing experiments under different balancing thresholds. The experimental results show that the adjustment of the balancing threshold allows the two-mode balancing circuit to obtain the best balancing speed and the experiment proves the effectiveness of the two-mode cell balancing circuit. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：96 / 107
页数：11
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