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Research on Active Balancing Method for Battery Pack Based on Improved Buck Converter
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Mingxi SHAO1, Hao ZHANG1, 2, Xiang CHEN3, Shaojiu YAN2, 3, Xiaojuan WANG1, Wei ZHANG1
Journal of Power Supply | 2025, 23(8) : 254 - 261
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Journal of Power Supply | 2025, 23(8): 254-261
• Battery and Energy Storage •
Research on Active Balancing Method for Battery Pack Based on Improved Buck Converter
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Mingxi SHAO1, Hao ZHANG1, 2, Xiang CHEN3, Shaojiu YAN2, 3, Xiaojuan WANG1, Wei ZHANG1
Affiliations
  • 1.College of Mechanical Engineering, Qinghai University, Xining 810016, China
  • 2.Beijing Graphene Technology Research Institute Co., Ltd., Beijing 100094, China
  • 3.Graphene Energy Materials Research Center, Beijing Institute of Aeronautical Materials, Beijing 100095, China
Published: 2025-12-30 doi: 10.13234/j.issn.2095-2805.2025.8.254
Outline
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The balancing technology is important for battery management systems. However, the widely used passive balancing technology has disadvantages such as a low efficiency and a long balancing time, while the active balancing technology which is more efficient has problems such as complex control and high cost. In response to the status quo, a double-layer balancing topology circuit based on an improved Buck converter is proposed. Its circuit parameters and balancing strategy are designed by taking into account the issue of matching, its working principle is analyzed in detail, and its economic cost is compared and analyzed, so as to verify the feasibility and economy of the proposed scheme. The simulation analysis of a model based on MATLAB/Simulink shows that the balancing time of the proposed scheme is reduced by 40.4% compared with that of the traditional adjacent cell balancing system. The results of a battery pack balancing test show that this scheme has advantages of a simple structure and simple control. It can quickly realize the balancing of 26650 lithium iron phosphate battery, and it only took 20.4 min to reduce the maximum differential voltage of four battery packs in series from 141 mV to within 50 mV.

Lithium-ion battery pack  /  active balancing  /  improved Buck circuit  /  balancing time
邵明玺, 张浩, 陈翔, 燕绍九, 王晓娟, 张薇. 基于改进型Buck变换器的电池组主动均衡方法研究. 电源学报, 2025 , 23 (8) : 254 -261 . DOI: 10.13234/j.issn.2095-2805.2025.8.254
Mingxi SHAO, Hao ZHANG, Xiang CHEN, Shaojiu YAN, Xiaojuan WANG, Wei ZHANG. Research on Active Balancing Method for Battery Pack Based on Improved Buck Converter[J]. Journal of Power Supply, 2025 , 23 (8) : 254 -261 . DOI: 10.13234/j.issn.2095-2805.2025.8.254
Funding
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  • Foundation of Beijing Institute of Aeronautical Materials(KJSC240307)
Appendix
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Year 2025 volume 23 Issue 8
54
6
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.8.254
  • Receive Date：2024-06-06
  • Online Date：2026-10-26
  • Published：2025-12-30
Article Data
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History
  • Received：2024-06-06
  • Accepted：2024-08-12
Funding
Foundation of Beijing Institute of Aeronautical Materials(KJSC240307)
Affiliations
    1.College of Mechanical Engineering, Qinghai University, Xining 810016, China
    2.Beijing Graphene Technology Research Institute Co., Ltd., Beijing 100094, China
    3.Graphene Energy Materials Research Center, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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