一种提高锂电池脉冲充电能量利用率的方法

Amethod to improve energy utilization of lithium battery pulse charging

极化是影响锂离子电池快速充电的重要因素,而正负脉冲法是一种常见的去极化方法。目前使用正负脉冲法对锂离子电池充电时,普遍使用电阻放电法消耗充电过程中放出的高能负脉冲,这种方法存在能量利用率低的问题。提出使用超级电容吸收并存储正负脉冲充电过程中放出的高能负脉冲的方法,当超级电容存储的电量达到设定值时,再将这部分电量用于对锂离子电池恒压充电。通过理论分析及仿真实验验证,提出的方法与传统的正负脉冲法相比,能量利用率提高了19%。

Polarization of lithium-ion batteries charging process is one of the most significant factors affecting the fast charging of lithium-ion batteries.And the positive and negative pulse method is a common depolarization method.At present,when a positive-negative pulse method is used to charge a lithium-ion battery,a resistance discharge method is generally used to consume negative pulses released during charging.This method has a problem of low energy utilization rate.In view of the above problems,this article proposed a method of using supercapacitors to absorb and store high-energy negative pulses during charging of positive and negative pulses.When the amount of electricity stored in the supercapacitor reached a set value,this part of the electricity was used to charge the voltage charging.Through theoretical analysis and simulation experiment verification,compared with the traditional positive and negative pulse method,the proposed method improves the energy utilization rate by 19%.