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Double-Layer E-Structure Equalization Circuit for Series Connected Battery Strings

Author

Listed:
  • Shungang Xu

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Kai Gao

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Xiaobing Zhang

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Kangle Li

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

Abstract

In order to eliminate the voltage imbalance among battery cells when they are connected in series, the paper proposes a double-layer E-structure (DLE) equalizer based on bidirectional buck–boost converters, which has the advantage of quick equalization speed and can be applied to arbitrary number batteries. Furthermore, a novel two-stage equalization control strategy is proposed for the DLE equalizer to decrease maximum voltage gap between the maximum and minimum voltage cells. The paper analyses the working principle of proposed equalizer in detail and describes the detailed design of the control strategy and implement process. Simulation and experiment results show that the proposed equalizer can improve equalization performance of battery cells compared with adjacent cell-to-cell (AC2C) equalizer.

Suggested Citation

  • Shungang Xu & Kai Gao & Xiaobing Zhang & Kangle Li, 2019. "Double-Layer E-Structure Equalization Circuit for Series Connected Battery Strings," Energies, MDPI, vol. 12(22), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4252-:d:284833
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    References listed on IDEAS

    as
    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.
    2. Xiangwei Guo & Longyun Kang & Zhizhen Huang & Yuan Yao & Huizhou Yang, 2015. "Research on a Novel Power Inductor-Based Bidirectional Lossless Equalization Circuit for Series-Connected Battery Packs," Energies, MDPI, vol. 8(6), pages 1-22, June.
    3. Yuanmao Ye & Ka Wai Eric Cheng, 2016. "An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings," Energies, MDPI, vol. 9(3), pages 1-15, February.
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    Cited by:

    1. E, Jiaqiang & Zhang, Bin & Zeng, Yan & Wen, Ming & Wei, Kexiang & Huang, Zhonghua & Chen, Jingwei & Zhu, Hao & Deng, Yuanwang, 2022. "Effects analysis on active equalization control of lithium-ion batteries based on intelligent estimation of the state-of-charge," Energy, Elsevier, vol. 238(PB).

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