The invention provides a control method for disconnecting a relay and a system thereof. The method comprises the steps that a vehicle control unit sends a direct-current preheating power-on instruction to a battery management system; the battery management system responds to the direct current preheating power-on instruction, and the smaller current value in the obtained bus current value and the charging pile output current value serves as the smaller current value; the battery management system judges whether the minimum current value is smaller than a set current value or not; if the battery management system judges that the minimum current value is smaller than the set current value, a relay disconnection request is sent to the vehicle control unit; the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system; and the battery management system disconnects the main positive relay and the main negative relay in response to the disconnect permission request. In the technical scheme provided by the embodiment of the invention, when the battery pack is preheated, the battery management system disconnects the main positive relay and the main negative relay, no current flows into the battery pack, and the service life of the battery is prolonged.

    本发明实施例提供了一种断开继电器的控制方法和系统。该方法包括:整车控制器向电池管理系统发送直流预热上电指令;电池管理系统响应于直流预热上电指令,将获取的母线电流值和充电桩输出电流值中电流值较小的作为取小电流值;电池管理系统判断取小电流值是否小于设定电流值;电池管理系统若判断出取小电流值小于设定电流值,向整车控制器发送继电器断开请求;整车控制器响应于继电器断开请求,向电池管理系统发送允许断开请求;电池管理系统响应于允许断开请求,断开主正继电器和主负继电器。本发明实施例提供的技术方案中,电池包预热时,电池管理系统断开主正继电器和主负继电器,不会有电流流进电池包中,提高了电池的使用寿命。


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    Title :

    Control method for disconnecting relay and system thereof


    Additional title:

    一种断开继电器的控制方法和系统


    Contributors:
    SHI LEI (author) / CAO QIANG (author) / LI CHAO (author) / XU WEIPING (author)

    Publication date :

    2021-07-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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