Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

• Main Authors: Dong-Hua Zhang, Guo-Rong Zhu, Shao-Jia He, Shi Qiu, Yan Ma, Qin-Mu Wu, Wei Chen
• Format: Article
• Language: English
• Published: MDPI AG 2015-03-01
• Series: Energies
• Subjects: EV; Li-ion battery; dynamic balanced point; control strategy; non-dissipative equalizer; series connected batteries
• Online Access: http://www.mdpi.com/1996-1073/8/3/1830

The Li-ion battery is becoming the optimal choice for the Electric Vehicle’s (EV) power supply. In order to protect the Li-ion battery from charging damage and to prolong the battery’s life, a special control strategy based on the dynamic balanced point along with a non-dissipative equalizer is presented. The main focus of the proposed control strategy is to insure that the individual cell of a battery pack will be rapidly, efficiently and simultaneously balanced, by adjusting equalizing current of each cell dynamically. In this paper, a model of a four series connected Li-ion batteries pack has been established to evaluate the proposed control strategy. Superior performance is demonstrated by the simulation and experiment.