基于模糊控制磁化能量锂离子电池智能均衡法

Li-ion battery equalization based on fuzzy control and magnetization energy

针对动力锂离子电池组在串联模块化使用时单体电池之间电压存在不一致的问题,提出基于模糊控制和磁化能量的锂离子电池组智能均衡方法。采用模糊控制策略,选取荷电状态(SOC)和电压作为控制参量,利用磁化能量对多电池组间的电压进行智能均衡,通过分析磁化能量原理,结合智能控制算法,对两组18650型锂离子电池串联系统进行实验测试,实验前最高电压与最低电压之间相差28. 4%,SOC最大相差91. 3%;通过智能均衡系统,进行自动均衡后,各单体电池之间最高电压与最低电压之间相差1. 98%,SOC最大相差3. 90%,在误差允许范围内,达到预期均衡效果。

To solve the problem of inconsistent voltage between single battery when the power Li-ion battery pack used in series modularization, an intelligent equalization method based on fuzzy control and magnetization energy for Li-ion battery pack was proposed. With fuzzy control strategy, state of charge ( SOC ) and voltage as control parameter, used magnetic energy intelligent equilibrium of the voltage between the battery pack, analyzed the principle of magnetic energy, combined with the intelligent control algorithm, the two groups of 18650 type Li-ion battery series were tested. Before the experiment, the difference between the highest voltage and the lowest voltage was 28.4%,and the maximum difference of SOC was 91. 3%. After automatic equalization through the intelligent equalization system, the difference between the highest voltage and the lowest voltage of each single battery was 1. 98%, and the maximum difference of SOC was 3. 90%. The expected equalization effect was achieved within the allowable range of error.