The invention relates to a charging pile charging current optimization strategy based on the health state of a power lithium ion battery of an electric vehicle, which solves the problem that the service life of the battery is seriously reduced by using a constant-voltage constant-current charging mode in the current market. The method mainly comprises the following steps of 1, establishing a simplified model of a battery health state and a charging current to obtain a relationship between a battery capacity fading speed and the charging current, 2, dynamically optimizing the charging current through a direct search method and a genetic algorithm to obtain corresponding optimal charging current databases of the battery in different life stages, 3, obtaining an optimized charging current Ioptimize according to the SOHbeform, and taking the optimized charging current Ioptimize as a charging current in a constant current stage, and 4, after the charging is finished, correcting the SOHbeform and the Ioptimize to serve as parameters of a local data updating model database, so as to improve the matching precision of the method and improve the convergence rate of the method. The charging current in the constant-current stage can be optimized according to the health state of the battery, accumulated damage to the battery caused by using a single charging current is reduced, and therefore the service life of the battery is prolonged.
本发明涉及了一种基于电动汽车动力锂离子电池健康状态的充电桩充电电流优化策略,解决目前市场上用恒压恒流充电方式电池寿命严重衰退的问题。主要步骤如下:1.建立电池健康状态与充电电流的简化模型,得到电池容量衰退速度与充电电流的关系;2.通过直接搜索法和遗传算法动态优化充电电流,得到电池不同寿命阶段下对应最佳充电电流数据库;3.根据SOHbefore得到优化充电电流Ioptimize,将其作为恒流阶段的充电电流;4.充电结束后,将SOHbefore和Ioptimize修正后作为本地数据更新模型数据库的参数,用于提高该方法的匹配精度和提升其收敛速度。本发明可以根据电池的健康状态来优化恒流阶段的充电电流,减少使用单一充电电流对电池的累加损害,从而延长电池的使用寿命。
Charging pile charging optimization strategy based on battery health state
一种基于电池健康状态的充电桩充电优化策略
2021-02-02
Patent
Electronic Resource
Chinese
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