Discharge scheduling for voltage balancing in reconfigurable battery systems. Issue 7 (2nd March 2017)

• Record Type: Journal Article
• Authors: Kim, Dongwan; Lee, Jinkyu
• Is Part Of: Electronics letters. Volume 53:Issue 7(2017)
• Page Start: 496
• Page End: 498
• Publication Date: 2017-03-02
• Subjects: battery management systems -- secondary cells -- scheduling -- life testing; discharge scheduling -- voltage balancing -- reconfigurable battery systems -- battery cell management -- switches -- connectivity control -- operation‐time maximisation -- life‐time maximisation -- battery system safety -- battery system efficiency -- system load distribution; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2016.4625
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : To manage thousands of battery cells effectively, a reconfigurable battery system has emerged where each battery cell is equipped with a set of switches for controlling connectivity (i.e. series, parallel, bypass or combinations thereof). While most studies have focused on maximising operation‐time or life‐time of a reconfigurable battery system, few studies have addressed how to quickly balance voltage of cells, which affects both efficiency and safety of a battery system. A new discharge scheduling policy for battery cell voltage balancing for a reconfigurable battery system is proposed. Based on the analysis why existing naive approaches are not effective for voltage balancing, a new approach consisting of three steps is designed: determination of a set of battery cells to be discharged, calculation of a target voltage, and distribution of the system load to each battery. The present simulation results show that the proposed approach outperforms three alternative ones up to 45.6% in terms of voltage balancing.