纯电动汽车动力锂电池SOC估计策略综述

电池管理系统(BMS)采用了防止电池过放电和过充,提供电池均衡控制,能够实现新能源汽车动力锂电池的最佳利用和保护。电池管理系统实时精准估算电池电荷状态(SOC)是提高电动汽车续航里程和延长寿命的关键。然而,SOC不能直接测量,动力电池的充、放电又是一个复杂过程,导致目前现有的SOC估算策略很难精确地估算出实时在线SOC值。因此,如何提高SOC估算精度是当下BMS领域的研究热点。本文通过对各种SOC估算方法进行文献综述,分析和总结各个SOC估算方法的原理及优缺点,提出SOC估计策略未来发展趋势。

Overview of SOC Estimation Strategies for Pure Electric Vehicle Power Lithium Batteries

In order to realize the optimal utilization and protection of lithium batteries in new energy vehicles,a battery management system(BMS)is adopted to prevent over discharge and over charge of batteries and provide battery balance.Accurate real-time estimation of battery charge SOC by battery management system is a necessary condition to improve the driving range of EVs and prolong EVs’life.However,SOC cannot be measured directly,and the process of charging and discharging of power battery is complex,which makes it difficult for the existing SOC estimation strategy to accurately estimate the value of online real-time battery SOC.Therefore,how to improve the accuracy of online SOC estimation is one of the main research focuses in the BMS field.Through literature review of various SOC estimation methods,this paper analyzes and summarizes the principles,advantages and disadvantages of each SOC estimation method,and proposes the future development trend of SOC estimation strategy.