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Active Charge Equalizer of Li-Ion Battery Cells Using Double Energy Carriers

Author

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  • Sang-Won Lee

    (Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 790-783, Korea)

  • Yoon-Geol Choi

    (Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 790-783, Korea)

  • Bongkoo Kang

    (Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 790-783, Korea)

Abstract

In this work, a new active balancing circuit is proposed. This circuit consists of a cell-access network and an energy-transfer network. The cell-access network requires 2 n + 6 switches, where n is the number of cells, and creates an energy-transfer path between unbalanced cells and the energy-transfer network. The energy-transfer network has double energy carriers and simultaneously implements cell-to-pack and pack-to-cell balancing operations without overlapping. As a result, a high power rate and fast balancing operation can be achieved by using two energy carriers in a single balancing circuit. The prototype of a proposed balancing circuit was built for six cells and then tested under various conditions; all cells in the state of charge (SOC) region of 70% to 80% were equalized after 93 min, and one charging/discharging period in the SOC region of 10% to 90% was increased by 8.58% compared to the non-balancing operation. These results show that the proposed circuit is a good way to balance charges among batteries in a battery pack.

Suggested Citation

  • Sang-Won Lee & Yoon-Geol Choi & Bongkoo Kang, 2019. "Active Charge Equalizer of Li-Ion Battery Cells Using Double Energy Carriers," Energies, MDPI, vol. 12(12), pages 1-13, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2290-:d:240096
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    References listed on IDEAS

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    1. Daehyun Kim & Keunhwi Koo & Jae Jin Jeong & Taedong Goh & Sang Woo Kim, 2013. "Second-Order Discrete-Time Sliding Mode Observer for State of Charge Determination Based on a Dynamic Resistance Li-Ion Battery Model," Energies, MDPI, vol. 6(10), pages 1-14, October.
    2. Yunlong Shang & Qi Zhang & Naxin Cui & Chenghui Zhang, 2017. "A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings," Energies, MDPI, vol. 10(2), pages 1-15, February.
    3. Jaw-Kuen Shiau & Chien-Wei Ma, 2013. "Li-Ion Battery Charging with a Buck-Boost Power Converter for a Solar Powered Battery Management System," Energies, MDPI, vol. 6(3), pages 1-31, March.
    4. Kotub Uddin & Alessandro Picarelli & Christopher Lyness & Nigel Taylor & James Marco, 2014. "An Acausal Li-Ion Battery Pack Model for Automotive Applications," Energies, MDPI, vol. 7(9), pages 1-26, August.
    5. 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. Mattia Ricco & Jinhao Meng & Tudor Gherman & Gabriele Grandi & Remus Teodorescu, 2019. "Smart Battery Pack for Electric Vehicles Based on Active Balancing with Wireless Communication Feedback," Energies, MDPI, vol. 12(20), pages 1-15, October.

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