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Control Strategy for Active Hierarchical Equalization Circuits of Series Battery Packs

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  • Xiaogang Wu

    (School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)

  • Zhihao Cui

    (School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China)

  • Xuefeng Li

    (School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China)

  • Jiuyu Du

    (State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)

  • Ye Liu

    (School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China)

Abstract

Most series battery active equalization circuits implement the equalization first within the series and then between the series, which restricts the equilibrium speed. A hierarchical equalization circuit topology based on the Buck-Boost module is applied in this paper. The equalization is divided into two different equalization processes according to the equilibrium energy flow. The two equalization processes can be performed simultaneously, and the currents in the different hierarchical circuits do not affect each other, thus achieving simultaneous equalizations within the series and between the series. An equalization condition of the terminal voltage is applied and simulations and experiments on charge, discharge, and static equalizations in the four series-connected ternary lithium-ion batteries are performed.

Suggested Citation

  • Xiaogang Wu & Zhihao Cui & Xuefeng Li & Jiuyu Du & Ye Liu, 2019. "Control Strategy for Active Hierarchical Equalization Circuits of Series Battery Packs," Energies, MDPI, vol. 12(11), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2071-:d:235722
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    References listed on IDEAS

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    1. Shubiao Wang & Longyun Kang & Xiangwei Guo & Zefeng Wang & Ming Liu, 2017. "A Novel Layered Bidirectional Equalizer Based on a Buck-Boost Converter for Series-Connected Battery Strings," Energies, MDPI, vol. 10(7), pages 1-15, July.
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    Cited by:

    1. Shengyi Luo & Dongchen Qin & Hongxia Wu & Tingting Wang & Jiangyi Chen, 2022. "Multi-Cell-to-Multi-Cell Battery Equalization in Series Battery Packs Based on Variable Duty Cycle," Energies, MDPI, vol. 15(9), pages 1-21, April.
    2. Jianwen Cao & Bizhong Xia & Jie Zhou, 2021. "An Active Equalization Method for Lithium-ion Batteries Based on Flyback Transformer and Variable Step Size Generalized Predictive Control," Energies, MDPI, vol. 14(1), pages 1-25, January.

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