Quantitative evaluation system for battery pack equalization model

doi:10.19799/j.cnki.2095-4239.2020.0260

Abstract

Abstract:

Various equalization models can be used to balance a battery pack, but their equalization performance is different. In previous reports, a qualitative analysis was the primary method used to evaluate balancing technologies. To clarify the advantages and disadvantages of various models and to find a better equalization model, this paper presents a quantitative evaluation system for a battery pack equalization model. The equalization structure cost, equalization time, available state of charge (SOC), and average thermal power are used as evaluation indexes. The equalization model is composed of an equalization structure and an equalization strategy, and the battery pack model consists of 96 lithium-ion batteries in series, with an initial SOC of the battery pack set to conform to a normal distribution. The value of the evaluation index is obtained through simulation and is normalized. The advantages and disadvantages of different models are compared using a radar chart and the comprehensive performance value is calculated to compare the performance of different models. Four typical flying equalization models are used as examples, and analysis with the quantitative evaluation system indicate that the four equalization models are able to effectively equalize the battery pack. The balance time of the flying inductance model was the shortest, the balancing structure cost of the flying resistance model was the lowest, the comprehensive performance of the flying winding model was the worst, and the comprehensive performance of the flying capacitor model was the best. In summary, the quantitative evaluation system can quickly and effectively evaluate the multi-dimensional and comprehensive performance of multiple battery pack equalization models.

Key words: quantitative, equalization model, flying form

CLC Number:

TM 912

Minwang WANG, Huawei WU, Zhen LIU. Quantitative evaluation system for battery pack equalization model[J]. Energy Storage Science and Technology, 2021, 10(1): 271-279.

Figures/Tables 18

Table 1

Parameters of battery pack model"

电池组电池数量	成组形式	单体电池额定电压	单体电池额定容量	电池组初始SOC
96	串联	3.7 V	2.6 A·h	以均值 $μ = 95$ 标准差 $σ = 1$ 生成96个符合正态分布的SOC值

Table 1

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Table 2

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Table 5

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结构形式	开关数量N_S	电阻数量N_R	电容数量N_C	电感数量N_L	绕组数量N_W	二极管数量N_D	成本C
飞渡电阻	2n	1	0	0	0	0	385
飞渡电容	2n	0	1	0	0	0	385
飞渡电感	2n+2	0	0	1	0	0	389
飞渡绕组	2n+1	0	0	0	2	1	389

结构形式	均衡时间T/s	可用SOC/%	平均热功率P/W	均衡结构成本C
飞渡电阻	2343	92.67	0.1034	385
飞渡电容	5830	94.06	0.002451	385
飞渡电感	1187	93.97	0.03901	389
飞渡绕组	7269	94.77	0.05873	389

结构形式	均衡时间T/s	可用SOC	平均热功率P/W	均衡结构成本C
飞渡电阻	0.242	0.083	0.917	0.083
飞渡电容	0.720	0.635	0.083	0.083
飞渡电感	0.083	0.599	0.385	0.917
飞渡绕组	0.917	0.917	0.548	0.917

结构形式	综合性能K	排名
飞渡电阻	4.5	3
飞渡电容	127.1	1
飞渡电感	20.4	2
飞渡绕组	2.0	4

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