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Article

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

Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 790-783, Korea
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Energies 2019, 12(12), 2290; https://doi.org/10.3390/en12122290
Received: 1 May 2019 / Revised: 11 June 2019 / Accepted: 12 June 2019 / Published: 15 June 2019
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 2n + 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. View Full-Text
Keywords: lithium-ion battery; charge equalizer; cell balancing circuit; battery management system lithium-ion battery; charge equalizer; cell balancing circuit; battery management system
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MDPI and ACS Style

Lee, S.-W.; Choi, Y.-G.; Kang, B. Active Charge Equalizer of Li-Ion Battery Cells Using Double Energy Carriers. Energies 2019, 12, 2290. https://doi.org/10.3390/en12122290

AMA Style

Lee S-W, Choi Y-G, Kang B. Active Charge Equalizer of Li-Ion Battery Cells Using Double Energy Carriers. Energies. 2019; 12(12):2290. https://doi.org/10.3390/en12122290

Chicago/Turabian Style

Lee, Sang-Won, Yoon-Geol Choi, and Bongkoo Kang. 2019. "Active Charge Equalizer of Li-Ion Battery Cells Using Double Energy Carriers" Energies 12, no. 12: 2290. https://doi.org/10.3390/en12122290

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