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Study on Electrical Characteristics Analysis and Electrical Circuit Model Design of Vanadium Redox Flow Battery Systems Based on Current and Flow Rate Conditions

Author

Listed:
  • Seongjun Lee

    (Department of Mechanical Engineering, Chosun University, Gwangju 61452, Republic of Korea)

  • Hyeonhong Jung

    (Mobase Electronics, Suwon 16648, Republic of Korea)

  • Yoon-Gyung Sung

    (Department of Mechanical Engineering, Chosun University, Gwangju 61452, Republic of Korea)

Abstract

Recent research has focused on vanadium redox flow batteries (VRFBs) to address the short lifetimes and fire risks associated with lithium battery systems. While VRFBs offer advantages in safety, they suffer from low energy density and efficiency compared with lithium batteries. To improve VRFB performance, studies are exploring improvements in materials such as anodes, cathodes, and separators and optimizing operations by controlling electrolyte flow rates. However, the impact of current magnitude on VRFB efficiency has been less studied, with few analyses addressing both current and flow rate effects. This research proposes an experimental procedure to evaluate charge/discharge efficiency, energy efficiency, and system efficiency across varying current magnitudes and electrolyte flow rates, using a 40 W VRFB stack composed of four 10 W cells in series. In addition, we introduce a design method for an electrical equivalent circuit model that simulates the VRFB stack, reflecting experimental findings. The model’s accuracy was validated by comparing it with data from 11 full charge/full discharge cycle tests, which varied current and electrolyte amounts.

Suggested Citation

  • Seongjun Lee & Hyeonhong Jung & Yoon-Gyung Sung, 2024. "Study on Electrical Characteristics Analysis and Electrical Circuit Model Design of Vanadium Redox Flow Battery Systems Based on Current and Flow Rate Conditions," Energies, MDPI, vol. 17(23), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:23:p:5841-:d:1526588
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    References listed on IDEAS

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    1. Hyeonhong Jung & Seongjun Lee, 2023. "A Study on Capacity and State of Charge Estimation of VRFB Systems Using Cumulated Charge and Electrolyte Volume under Rebalancing Conditions," Energies, MDPI, vol. 16(5), pages 1-14, March.
    2. Kim, Jungmyung & Park, Heesung, 2017. "Experimental analysis of discharge characteristics in vanadium redox flow battery," Applied Energy, Elsevier, vol. 206(C), pages 451-457.
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