Discharge scheduling for voltage balancing in reconfigurable battery systems

作者：Kim Dongwan; Lee Jinkyu^*

来源：Electronics Letters, 2017, 53(7): 496-498.

DOI：10.1049/el.2016.4625

• 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

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.

• 出版日期2017-3-30