Fuzzy Controlled Individual Cell Equalizers for Lithium-Ion Batteries

Yuang-Shung LEE  Ming-Wang CHENG  Shun-Ching YANG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B   No.7   pp.2380-2392
Publication Date: 2008/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.7.2380
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Energy in Electronics Communications
Keyword: 
fuzzy logic control,  bi-directional Cuk converter,  discontinuous capacitor voltage mode,  battery equalization,  lithium-ion battery,  

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Summary: 
A fuzzy logic control battery equalizing controller (FLC-BEC) is adopted to control the cell voltage balancing process for a series connected Li-ion battery string. The proposed individual cell equalizer (ICE) is based on the bidirectional Cuk converter operated in the discontinuous capacitor voltage mode (DCVM) to reduce the switching loss and improve equalization efficiency. The ICE with the proposed FLC-BEC can reduce the equalizing time, maintain safe operations during the charge/discharge state and increase the battery string capacity.