The invention provides an electric vehicle battery charging and discharging control method. The method comprises the steps of obtaining the required charging and discharging voltage of an electric vehicle from a battery management system by a charging and discharging pile; acquiring initial working required current by a main control unit of the charging and discharging pile according to the required voltage; calculating an initial power set value according to the required voltage and the initial working required current value, calculating the initial electric energy conversion efficiency eta 1 of the charging and discharging pile, and taking the initial electric energy conversion efficiency eta 1 as a maximum efficiency value; and adjusting the working current of charging and discharging according to a preset stepping value, obtaining the actual electric energy conversion efficiency of the current working point, and determining the working current of charging and discharging according to the change direction of the actual electric energy conversion efficiency. The energy conversion efficiency of the charging and discharging pile is monitored in real time, the battery demand power and the charging and discharging pile power grid end power conversion rate are monitored on the electric vehicle side to adjust the working voltage of the charging and discharging module, and the overall efficiency of the system is improved.

    本发明提供一种电动汽车电池充放电控制方法,所述方法包括:充放电桩从电池管理系统取得电动汽车充放电的需求电压;充放电桩的主控单元根据所述需求电压,获取初始工作需求电流;根据所述需求电压和初始工作需求电流值计算初始功率设置值,计算充放电桩初始电能转换效率,将所述初始电能转换效率η1作为最大效率值;按照预设的步进值调整充放电的工作电流,并获取当前工作点的实际电能转换效率,根据实际电能转换效率的变化方向,确定充放电的工作电流。通过实时监控充放电桩的能量转化效率,在电动汽车侧监测电池需求功率、充放电桩电网端功率转化率来实现充放电模块工作电压的调整,提高系统整体效能。


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    Title :

    Electric vehicle battery charging and discharging control system and control method


    Additional title:

    一种电动汽车电池充放电控制系统及控制方法


    Contributors:
    XIA YANSONG (author) / CHAI JIN (author) / LAO YONGJIAN (author) / XU ZHENTAO (author) / ZHANG XIAODONG (author) / LAN JING (author)

    Publication date :

    2021-04-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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