An Active Cascaded Battery Voltage Balancing Circuit Based on Multi-Winding Transformer with Small Magnetizing Inductance

Young-Hwa Park, Rae-Young Kim and Yeong-Jun Choi
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Young-Hwa Park: Hyundai & Kia Motors Namyang Institute, Hwaseong 18280, Korea
Rae-Young Kim: The Department of Electrical and Biomedical Engineering, Hanyang University, Seoul 04763, Korea
Yeong-Jun Choi: The Department of Electrical Engineering, Jeju National University, Jeju 63243, Korea

Energies, 2021, vol. 14, issue 5, 1-17

Abstract: This paper covers the active voltage balancing method of secondary batteries. The number of applications using secondary batteries is increasing, and the batteries are normally connected in series/parallel to increase discharge cycle and power. The problem is that when there is a voltage imbalance between the cells or modules of a battery, there is a risk of an accident in the near-sighted way, shortening the life of the battery cells. Although this risk was prevented through passive balancing, this approach has limitations, including heat generation, long balancing time, and in the case of a battery that needs to be balanced between modules (or between stacks), its effectiveness decreases. Therefore, in this paper, an active cell balancing method that can overcome the limitations mentioned before is proposed. The proposed method uses a multi-winding transformer, and to increase the power density, the magnetizing inductance is decreased, and an auxiliary circuit is added. The validity of the proposed circuit was verified through mode analysis and simulation. In addition, waveforms showing the balancing performance under various conditions and the comparison results between conventional and proposed methods are given.

Keywords: active battery voltage balancing; battery management system; lithium-ion battery; multi-winding transformer (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: 2021
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