Abstract: A fixed terminal voltage threshold simply took as power battery equalization control indicators, which might lead to equalization judgment errors and equalization circuit on-off frequently. To solve above problems, based on the impact analyses of lithium battery polarization voltages, Ohm internal resistance, charge-discharge current on the terminal voltage characteristics, a dynamic fuzzy threshold equilibrium method was proposed. First of all, based on the fuzzy algorithm, terminal voltage thresholds were dynamically setted, then equalization control operations were carried out. Experimental results show that compared with the threshold voltage of the traditional equilibrium strategies, this method may effectively reduce monomer battery terminal voltage differences,obviously shorten the equilibrium time.

Key words: battery equalization, terminal voltage, dynamic threshold, fuzzy algorithm

摘要： 简单地以固定的端电压阈值作为动力电池组均衡控制指标，可能会导致均衡判断失误和均衡电路频繁启动等问题，针对此，在分析锂电池极化电压、欧姆内阻、充放电电流对端电压影响特性的基础上，提出基于动态模糊阈值的均衡方法，首先基于模糊算法对端电压阈值进行动态设置，然后据此进行均衡控制操作。实验表明，与传统端电压阈值均衡策略相比，该方法能够有效缩小单体电池之间端电压差异，明显缩短均衡时间。

关键词: 电池均衡, 端电压, 动态阈值, 模糊算法