基于恒定温升曲线的多段恒流充电方法

Multi-stage galvanostatic charging method based on constant temperature rising curve

充电过程中温升过高,会影响锂离子电池的充电效率、缩短寿命。建立直流内阻随荷电状态(SOC)和电流变化的关系;确定随SOC变化的电池充电电流可接受能力曲线,并依据各个阶段的充电可接受能力,分配对应的温升量,得到充电优化温升曲线。用设计的模糊控制器调整充电电流,使电池温度跟随优化温升曲线,控制电池温度,缩短充电时间。与传统多段恒流充电方法相比,该方法的充电时间缩短了13.4%,同时将温升控制在设定的范围内。

The high temperature rise during charging would affect the charging efficiency and shorten the life of Li-ion battery.The relation between direct current internal resistance with the change of state of charge(SOC)and current was established.The battery charging current acceptability curve with the change of SOC was determined,the corresponding temperature rise amount according to the charging acceptability at each stage to get the charging optimized temperature rise curve was assigned.The charging current through designed fuzzy controller to made the battery temperature follow the optimized temperature rise curve was adjusted,the battery temperature was controlled and the charging time was shortened.Compared with traditional multi-stage galvanostatic charging method,the charging time of this method was shortened by 13.4%,the temperature rise was controlled within the set range.