Research on multi-threshold adaptive clustering group equalization control of energy storage battery pack

doi:10.19799/j.cnki.2095-4239.2022.0616

Abstract

Abstract:

A multi-threshold adaptive clustering group equalization control method is suggested to lessen the inevitable consistency discrepancy between the cells in the energy storage battery pack. First, a single-inductor energy storage equalization topology with a simple structure, simple control, and perfect balancing function is presented and its design process of equalization principle and control signal duty cycle is examined. Second, a multi-threshold adaptive clustering cluster equalization control method is proposed. To implement the transmission of equalization energy across battery groups with various numbers of neighboring cells, the concept of cluster equalization is introduced, and a control technique for group equalization is devised based on nearby cells with minor consistency discrepancies. Finally, through the simulation experiment, it is confirmed that compared with the "single to single" equalization control method based on range or average, the proposed adaptive clustering group equalization control method enhances the equalization speed by 40.4%, 24.6%, and 17.5% respectively under the condition that the initial state of charge(SOC) distribution is high in the middle, low in both sides, high in both sides, low in the middle, and uniform distribution, while ensuring the equalization efficiency. Additionally, following equalization, each SOC's discrete degree is lower than the battery pack's average SOC. To improve the consistency difference between each cell within the storage battery pack, increase its energy utilization and cycle life, and encourage the use of energy storage battery packs, this study offers a novel equalization idea for a battery pack made up of many cells used for energy storage

Key words: multi-threshold, adaptive clustering, group equalization, adjacent cells, equalization speed, discrete degree

CLC Number:

TM 912

Xiangwei GUO, Qi WU, Chen WANG, Xiaozhuo XU, Liangjun Zhao. Research on multi-threshold adaptive clustering group equalization control of energy storage battery pack[J]. Energy Storage Science and Technology, 2023, 12(3): 889-898.

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参数	数值
电池数量/节	12
电池额定容量/Ah	2.6
电池额定电压/V	3.7
电感L/μH	47
二极管导通压降/V	0.4
均衡启动阈值 φ /%	3
开关频率/kHz	10

参数名称	数值
均衡前单体SOC/%	56.1, 56.8, 57.5, 58.3, 59, 60, 59.2, 58, 57.2, 56.5, 55.5, 55
均衡前SOC极差/%	5
均衡后单体SOC/%	55.17, 55.87, 56.57, 57.37, 57.36, 57.96, 57.36, 57.04, 56.24, 55.57, 55.47, 54.97
均衡后SOC极差/%	2.99

单体电量中间高，两边低(B₁～B₁₂)	56.1, 56.8, 57.5, 58.3, 59, 60, 59.2, 58, 57.2, 56.5, 55.5, 55
单体电量两边高，中间低(B₁～B₁₂)	60, 59.2, 58, 57.2, 56.5, 55.5, 55, 56.1, 56.8, 57.5, 58.3, 59
单体电量均匀分布(B₁～B₁₂)	57.2, 59.2, 58, 55, 56.1, 57.5, 59, 60, 56.8, 58.3, 55.5, 56.5

控制方法	单体电量分布情况	均衡后各单体(B₁～B₁₂)SOC/%	均衡效率/%	标准差
“单对单” 均衡	单体电量中间高，两边低	56.10, 56.80, 57.50, 58.30, 58.72, 58.72, 58.72, 57.94, 57.14, 56.44, 55.73, 55.73	99.816	1.1135
	单体电量两边高，中间低	58.72, 58.72, 57.95, 57.15, 56.45, 55.73, 55.73, 56.09, 56.79, 57.49, 58.29, 58.72	99.817	1.1136
	单体电量均匀分布	57.20, 58.74, 57.99, 55.74, 56.07, 57.47, 58.73, 58.73, 56.78, 58.28, 55.74, 56.50	99.836	1.1150
聚类群组控制	单体电量中间高，两边低	56.10, 56.80, 57.50, 58.30, 58.30, 58.90, 58.30, 57.98, 57.18, 56.50, 56.40, 55.90	99.860	0.9640
	单体电量两边高，中间低	58.75, 58.15, 57.97, 57.17, 56.47, 56.25, 55.76, 56.35, 56.79, 57.49, 58.15, 58.75	99.852	0.9773
	单体电量均匀分布	57.20, 58.78, 57.99, 55.79, 56.39, 57.47, 58.19, 58.79, 56.78, 58.28, 55.79, 56.50	99.834	1.0395

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