빠른 전하 균일화를 위한 새로운 구조의 셀 밸런싱 회로A Novel Cell Balancing Circuit for Fast Charge Equalization
- Other Titles
- A Novel Cell Balancing Circuit for Fast Charge Equalization
- Authors
- 박동진; 최시영; 김용욱; 김래영
- Issue Date
- Apr-2015
- Publisher
- 전력전자학회
- Keywords
- Lithium-ion battery; SOC(State of Charge); Balancing current; Symmetrical multi-winding transformer
- Citation
- 전력전자학회 논문지, v.20, no.2, pp.160 - 166
- Indexed
- KCI
- Journal Title
- 전력전자학회 논문지
- Volume
- 20
- Number
- 2
- Start Page
- 160
- End Page
- 166
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143539
- DOI
- 10.6113/TKPE.2015.20.2.160
- ISSN
- 1229-2214
- Abstract
- This study proposes an improved cell balancing circuit for fast equalization among lithium-ion (Li-ion) batteries. A simple voltage sensorless charge balancing circuit has been proposed in the past [1]. This cell balancing circuit automatically transfers energy from high-to low-voltage battery cells. However, the circuit requires a switch with low on-resistance because the balancing speed is limited by the on-resistance of the switch. Balancing speed decreases as the voltage difference among the battery cells decrease. In this study, the balancing speed of the cell balancing circuit is enhanced by using the auxiliary circuit, which boosts the balancing current. The charging current is determined by the nominal battery cell voltage and thus, the balancing speed is almost constant despite the very small voltage differences among the batteries. Simulation results are provided to verify the validity of the proposed cell balancing circuit.
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