The invention discloses a new energy vehicle, a vehicle power supply system and a control method thereof. The vehicle power supply system comprises a power battery, a main switch, a first DCDC converter and a second DCDC converter. The control method comprises the following steps: when the main switch is switched off, controlling the second DCDC converter to obtain the electricity consumption of the low-voltage electric equipment connected with the second DCDC converter; and when the main switch is turned on, the power consumption acquired by the second DCDC converter is received, so that the remaining power of the power battery is updated according to the power consumption. According to the technical scheme, due to the fact that the second DCDC converter is adopted to replace a low-voltage storage battery, the weight is light, the weight of the whole vehicle is reduced, meanwhile, the electricity consumption of the vehicle in the parking state is obtained through the second DCDC converter, the current SOC value of the power battery is recorded and updated when the vehicle is restarted, the situation that SOC calculation of the power battery is inaccurate can be avoided, and the reliability of the vehicle is improved. Therefore, the safety and the reliability of the vehicle are improved.

    本发明公开一种新能源车辆、车辆供电系统及其控制方法,车辆供电系统包括动力电池、主开关、第一DCDC变换器、第二DCDC变换器;控制方法包括:当主开关断开时,控制第二DCDC变换器获取与其连接的低压用电设备的用电量;当主开关导通时,接收第二DCDC变换器获取的用电量,以根据用电量更新动力电池的剩余电量。本技术方案由于采用第二DCDC变换器替换低压蓄电池,重量较轻,进而降低整车的重量,同时通过第二DCDC变换器获取车辆驻车状态的用电量,当车辆重新启动时记录并更新当前动力电池SOC值,可以避免动力电池SOC计算不准确的情况发生,从而提高车辆的安全性和可靠性。


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    Title :

    New energy vehicle, vehicle power supply system and control method thereof


    Additional title:

    新能源车辆、车辆供电系统及其控制方法


    Contributors:
    MAO TAOYUE (author) / LI WEICHENG (author) / GUAN ZONGYUN (author) / SHI LEI (author) / XUE PENGHUI (author)

    Publication date :

    2024-07-26


    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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