一种均衡考虑锂电池内部能量损耗和充电速度的多段恒流充电方法

锂电池快速充电方法应该均衡考虑电池的安全、寿命和充电时间。为此,应该控制锂电池的温度或能量损耗。提出一种均衡考虑锂电池能量损耗和充电时间的多段恒电流充电方法。首先,通过测试不同电流的恒流工况充电电压曲线,建立锂电池直流内阻随荷电状态(SOC)和电流I变化的函数关系式。其次,简化恒流段内能量损耗计算表达式,并设计用于均衡充电时间和能量损耗的充电目标方程。最后,设计一条权重变化曲线以确定各个恒流段的充电电流。此方法实验过程简单,充电电流的计算过程简单。通过与恒流充电方法的实验比较,验证了该方法的优点。

A Multistage Current Charging Method for Li-Ion Battery Considering Balance of Internal Consumption and Charging Speed

A fast charging method should make a balance between battery's safety/cycle life and charging time.For that the battery's temperature or energy loss should be controlled in the method.This paper proposed a charging method of Li-ion battery to balancing internal consumption and charging speed.Firstly,based on the constant current charging voltage curves of the Li-ion battery,the method gave a procedure to get the relationship of the internal resistances with stage of charge (SOC) and charge currents.Then the energy loss function was simplified and an objective function was designed for balancing charging time and the loss.Finally,for real time implementation,a multistage current charging curve is designed with different balance weight factors in each stage.Experiment shows the advantages.