间歇-正负脉冲蓄电池快速充电方法的研究

Research on Intermittent-Positive and Negative Pulse Fast Charging of Lithiumion Battery

目前影响锂离子电池充电速度的关键问题之一是如何消除或减小充电过程中的极化现象。传统的快速充电法中使用比较广泛的是多阶恒流脉冲充电法,主要采用正脉冲、停充等方式来减小或消除极化效应,在一定程度上提高了充电速度,但效果不够理想。提出的间歇-正负脉冲充电法,首先依据析气点电压和极化电压监测蓄电池极化状况,然后采用两种模糊控制器,分别确定间歇-正负脉冲充电法中的正负脉冲宽度,采用交替充电和放电减少或消除充电过程中的极化现象。实验证明,间歇-正负脉冲充电方法比传统的采用停充方式的多阶恒流脉冲充电法充电速度提高了33.3%,充电效率提高了5.1%,温升降低了57%。

One of the key issues currently affecting charging speed of lithium ion battery is how to eliminate or reduce the polarization in the charging process. More widely using in fast charge battery of traditional fast charging method is the multi-stage constant current pulse charging method which takes method of positive pulse,stop charging and other ways to reduce or eliminate the polarization effect to improve the charging speed in a certain extent,but the result is not satisfied. This paper proposes the intermittent-positive and negative pulse charging method using alternately charge and discharge to reduce or eliminate the polarization phenomenon. Gassing point voltage and polarization voltage are used to monitor the polarization status of storage battery. And then,two fuzzy controllers identify the positive and negative pulsed width for the intermittent positive and negative pulse method. According to the experimental results,comparing with traditional multi-stage constant current pulse charging method using stop charging mode,the charging time,charging efficiency and average temperature rise,are improved by about 33. 3%,5. 1%,57. 1%,respectively.