Multiple staggered symmetric equalization scheme based on Cuk circuits

doi:10.19799/j.cnki.2095-4239.2021.0049

Abstract

Abstract:

Equalization control, as an effective way to improve inconsistencies in electric vehicle battery packs, has been developed as one of the key technologies in automobile power batteries. In order to solve the problems of long time and slow balancing speed of inductive topological equalization, this study proposes a multi-staggered symmetric equalization scheme based on Cuk circuits. Taking a single battery for the investigation, the stop parameters were introduced to complete the design and optimization of the equalization strategy, and equalization control was achieved. This equalization scheme, which has the advantages of simple topology and fast balancing speed, overcomes the disadvantages of the long energy transfer path of traditional inductive equalization and achieves the adaptive adjustment of control signal duty cycles of the balancing module. Finally, in order to verify the results, an equalization simulation model of ten batteries was built. The simulation results show that the equalization scheme can improve the equalization speed and the inconsistency of battery packs.

Key words: series battery, cuk circuit, active equalization, state of charge

CLC Number:

TM 911

Bin LI, Lei XU, Zheng ZHENG, Dandan HU, Guobin ZHANG. Multiple staggered symmetric equalization scheme based on Cuk circuits[J]. Energy Storage Science and Technology, 2021, 10(4): 1400-1406.

Figures/Tables 10

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References 18

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参数名称	数值
标称电压/V	3.7
开关频率/kHz	10
均衡精度	0.5%
电感/μH	200
电容/μF	150
二极管导通压降V	0.7
库仑效率	1
阙值θ	0.07%

状态	均衡方案	电池SOC值/%
状态	均衡方案	1	2	3	4	5	6	7	8	9	10
均衡前		58	57.6	56.4	56.3	57.3	57.1	56	55.9	56.5	55.5
均衡后	本文方案	56.38	56.28	56.19	56.12	56.38	56.31	56.18	56.11	56.17	55.88
	文献[15]	56.84	56.74	56.53	56.43	56.34	56.75	56.65	56.55	56.45	56.35
	文献[16]	56.51	56.3	56.17	56.14	56.19	56.15	56.1	56.1	56.21	56.01

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