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A Charge-Equalization Circuit with an Intermediate Resonant Energy Tank

Author

Listed:
  • Yao-Ching Hsieh

    (Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan)

  • You-Chun Huang

    (Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan)

  • Po-Chun Chuang

    (Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan)

Abstract

In this paper, we propose a novel charge-equalization circuit for series-connected batteries. The circuit is composed of an intermediate resonant energy tank, formed by an inductor and a capacitor, and selection switches connected to each battery. The advantage of the proposed circuit is that an exchange of unbalanced charge can be established between any two batteries via the intermediate energy tank. In addition, more than one adjacent battery can serve as a charge-transference party on either side through proper activation of the associated selection switches. Moreover, by virtue of the resonant tank, zero-current switching can be achieved to significantly reduce the transference losses. A laboratory circuit with a control unit was designed for eight 2.5 Ah lithium iron phosphate (LiFePO 4 ) batteries in series. The test results demonstrate that the proposed charge-equalization circuit can realize charge balance effectively. With the charge-equalization circuit, the worst open-circuit voltage difference can be reduced to less than 20 mV under offline conditions, which helps the batteries operate more efficiently.

Suggested Citation

  • Yao-Ching Hsieh & You-Chun Huang & Po-Chun Chuang, 2020. "A Charge-Equalization Circuit with an Intermediate Resonant Energy Tank," Energies, MDPI, vol. 13(24), pages 1-14, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6566-:d:461261
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    References listed on IDEAS

    as
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    3. Mahammad A. Hannan & Mohammad M. Hoque & Pin J. Ker & Rawshan A. Begum & Azah Mohamed, 2017. "Charge Equalization Controller Algorithm for Series-Connected Lithium-Ion Battery Storage Systems: Modeling and Applications," Energies, MDPI, vol. 10(9), pages 1-20, September.
    4. Bizhong Xia & Wenhui Zheng & Ruifeng Zhang & Zizhou Lao & Zhen Sun, 2017. "A Novel Observer for Lithium-Ion Battery State of Charge Estimation in Electric Vehicles Based on a Second-Order Equivalent Circuit Model," Energies, MDPI, vol. 10(8), pages 1-20, August.
    5. Xiudong Cui & Weixiang Shen & Yunlei Zhang & Cungang Hu, 2017. "A Novel Active Online State of Charge Based Balancing Approach for Lithium-Ion Battery Packs during Fast Charging Process in Electric Vehicles," Energies, MDPI, vol. 10(11), pages 1-17, November.
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