전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제20권2호
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  • Pages.160-166
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  • 2015
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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빠른 전하 균일화를 위한 새로운 구조의 셀 밸런싱 회로

A Novel Cell Balancing Circuit for Fast Charge Equalization

  • Park, Dong-Jin (Dept. of Electrical Eng., EECS lab., Hanyang University) ;
  • Choi, See-Young (Dept. of Electrical Eng., EECS lab., Hanyang University) ;
  • Kim, Yong-Wook (Dept. of Electrical Eng., EECS lab., Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical and Biomedical Eng., Hanyang University)
  • 투고 : 2014.10.07
  • 심사 : 2015.03.02
  • 발행 : 2015.04.20
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초록

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. 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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참고문헌

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