Preprint Article Version 1 This version is not peer-reviewed

Analysis and Application of a Novel Layered Bidirectional Equalizer for Series Connected Battery Strings

Version 1 : Received: 27 March 2017 / Approved: 27 March 2017 / Online: 27 March 2017 (10:41:03 CEST)

How to cite: Wang, S.; Kang, L.; Li, W.; Guo, X.; Wang, Z.; Liu, M. Analysis and Application of a Novel Layered Bidirectional Equalizer for Series Connected Battery Strings. Preprints 2017, 2017030198 (doi: 10.20944/preprints201703.0198.v1). Wang, S.; Kang, L.; Li, W.; Guo, X.; Wang, Z.; Liu, M. Analysis and Application of a Novel Layered Bidirectional Equalizer for Series Connected Battery Strings. Preprints 2017, 2017030198 (doi: 10.20944/preprints201703.0198.v1).

Abstract

To eliminate the influence of the inconsistency on the cycle life and the available capacity of the battery pack, and improve the balancing speed, a novel inductor-based layered bidirectional equalizer (IBLBE) is proposed. The equalizer is composed of the bottom balancing circuits and the upper balancing circuits, and the two layer circuits both consist of a plurality of balancing sub-circuits, which allow the dynamic adjustment of equalization path and equalization threshold. The battery string is modularized by layered balancing circuits to realize fast active equalization, especially for long battery strings. By controlling the bottom balancing circuits, the individual cells can be balanced in each module. At the same time, the equalization between battery modules can be realized by controlling the upper balancing circuits. Simulation and experimental results demonstrate that the proposed equalizer can achieve fast active equalization for a long battery string, and has the characteristics of multi balancing path, large balancing current and high accuracy. The advantages of the proposed equalizer are further verified by a comparison with existing active equalizer.

Subject Areas

series connected battery string; layered bidirectional equalizer; power inductor; dynamic adjustment of equalization path

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