An Balancing Strategy Based on SOC for Lithium-Ion Battery Pack

[摘要] According to the two kinds of working state of a battery pack, we designed a balancing strategy based on SOC, and expounds the working principle of balanced control strategy: the battery is charging, the battery charged state of the highest monomer battery is balanced discharge, strong single battery charging current decreases, while the other single cell in the same group is not affected; the battery is in a discharge or static state, single cell battery is the weakest balanced charge, while the other single cell in the same group are not affected. In this paper, we design a kind of lithium ion battery charging and discharging equalizer based on Buck chopper circuit and Boost-Buck chopper circuit. The equalizer is balanced charging and discharging experiments of series four lithium iron phosphate battery, the experimental results show that this equalizer has not only improved the degree not equilibrium between single cells, and improve the battery charge and discharge capacity.

[发布机构] Tongji Zhejiang College, Zhejiang; 314006, China^1

[效力级别] 机械制造

[关键词] Balanced control;Balancing strategy;Battery charge and discharge;Charged state;Chopper circuits;Lithium iron phosphates;Static state;Working state