Double-Layer E-Structure Equalization Circuit for Series Connected Battery Strings

Shungang Xu, Kai Gao, Xiaobing Zhang and Kangle Li
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Shungang Xu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Kai Gao: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Xiaobing Zhang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Kangle Li: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China

Energies, 2019, vol. 12, issue 22, 1-16

Abstract: In order to eliminate the voltage imbalance among battery cells when they are connected in series, the paper proposes a double-layer E-structure (DLE) equalizer based on bidirectional buck–boost converters, which has the advantage of quick equalization speed and can be applied to arbitrary number batteries. Furthermore, a novel two-stage equalization control strategy is proposed for the DLE equalizer to decrease maximum voltage gap between the maximum and minimum voltage cells. The paper analyses the working principle of proposed equalizer in detail and describes the detailed design of the control strategy and implement process. Simulation and experiment results show that the proposed equalizer can improve equalization performance of battery cells compared with adjacent cell-to-cell (AC2C) equalizer.

Keywords: series-connected battery string; buck–boost converter; voltage gap; equalizers (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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