The invention provides a relay circuit of a power battery pack and a relay fault identification method, a VCU outside the power battery pack is not directly connected to a control end of an emergency power-off relay, but a BMS controller is connected to the emergency power-off relay through a first diode. After an emergency power-off signal of the whole vehicle is received, a VCU outside the power battery pack does not directly control the control end of the emergency power-off relay, but sends an emergency power-off instruction to the BMS controller, the BMS controller disconnects the main positive relay according to the emergency power-off instruction, then the emergency power-off relay is disconnected after waiting for a period of time, and the power battery pack is powered off. In addition, the control end of the emergency power-off relay is connected in parallel with an anti-reverse diode, so that uncontrolled opening and closing of the emergency power-off relay caused by frequent voltage jump of the control end of the emergency power-off relay are avoided, and the probability of damage of the relay is reduced.

    本申请提供一种动力电池包的继电器电路及继电器故障识别方法,动力电池包外部的VCU不直接连接到紧急断电继电器的控制端,而是,将BMS控制器通过第一二极管连接到紧急断电继电器。在接收到整车的紧急断电信号后,动力电池包外部的VCU不直接控制紧急断电继电器的控制端,而是先发送紧急断电指令给BMS控制器,BMS控制器根据紧急断电指令断开主正继电器,然后等待一段时间后断开紧急断电继电器,防止带载荷拉开紧急断电继电器可能造成继电器的损坏,并且,在紧急断电继电器的控制端并联了一个防反二极管,来避免紧急断电继电器控制端电压的频繁跳变造成紧急断电继电器不受控制的断开和闭合,减少继电器损坏的概率。


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    Title :

    Relay circuit of power battery pack and relay fault identification method


    Additional title:

    一种动力电池包的继电器电路及继电器故障识别方法


    Contributors:
    FU XINGFENG (author) / YAO WEIHAO (author) / GAO ZHENYU (author) / YU XIANGSONG (author) / HE GUOXIN (author) / WANG MANLI (author) / KE HUABO (author)

    Publication date :

    2023-08-04


    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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