基于等效电路模型的动力电池SOC估计方法综述

Review of SOC Estimation Methods for Power Battery Based on Equivalent Circuit Model

动力电池的准确建模及荷电状态(State of charge,SOC)的精准估计对提高电池的利用效率、延长使用寿命具有重要意义。各类SOC估计方法中,基于电池等效电路模型估计法的精准性和鲁棒性好,且电池模型结构简单、计算量小,在电池管理系统(Batter management system,BMS)中具有较好应用前景。聚焦基于等效电路模型的SOC估计方法,首先简要归纳了常见的电池等效电路模型,重点对基于等效电路模型的SOC估计方法进行了系统梳理和优缺点比较,对目前影响SOC估计精度的主要症结及应对策略进行了分析和总结。最后,对未来SOC估计方法的研究动向进行了讨论与展望。

Accurate modeling and estimation of state of charge(SOC) of power battery are of great significance for improving the utilization efficiency of battery and prolonging its service life. Among all kinds of SOC estimation methods, the one based on the battery equivalent circuit model has good accuracy and robustness, and the battery model has simple structure and small calculation amount. Therefore, its application prospect in the battery management system(BMS) is bright. Focusing on the SOC estimation methods based on the equivalent circuit model, the common battery equivalent circuit models at home and abroad are summarized, and then the existed SOC estimation methods are compared. The factors affecting the estimation accuracy of SOC and the countermeasures are also analyzed in detail. Finally, the research trend of SOC estimation in the future is discussed and prospected.