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

Sang-Won Lee, Yoon-Geol Choi and Bongkoo Kang
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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

Energies, 2019, vol. 12, issue 12, 1-13

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.

Keywords: lithium-ion battery; charge equalizer; cell balancing circuit; battery management system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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