A Novel Layered Bidirectional Equalizer Based on a Buck-Boost Converter for Series-Connected Battery Strings

Shubiao Wang, Longyun Kang, Xiangwei Guo, Zefeng Wang and Ming Liu
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Shubiao Wang: New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
Longyun Kang: New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
Xiangwei Guo: College of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Zefeng Wang: New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
Ming Liu: New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2017, vol. 10, issue 7, 1-15

Abstract: To eliminate the influence of the inconsistency on the cycle life and the available capacity of battery packs, and improve the balancing speed, a novel inductor-based layered bidirectional equalizer (IBLBE) is proposed. The equalizer is composed of two layers of balancing circuits connected in parallel. Each layer contains multiple balancing sub-circuits based on buck-boost converters. These balancing sub-circuits can equalize the corresponding cells simultaneously, and allow the dynamic adjustment of equalization path and equalization threshold. Analysis and simulation results demonstrate the IBLBE has a higher level balancing speed than other equalizers based on switched-capacitor or switched-inductor converters, and reduces the balancing time by 30% compared to existing inductor-based parallel architecture equalizers (PAEs). Experimental results are presented to validate the analysis and effectiveness of the proposed equalizer.

Keywords: battery string; layered bidirectional equalizer; buck-boost converter; balancing speed (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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