A relay diagnosis apparatus according to the present disclosure includes a first voltage detection circuit to generate a first diagnosis voltage at a voltage between a positive electrode terminal of a battery assembly and a chassis; a second voltage detection circuit to generate a second diagnosis voltage at a voltage between a negative electrode terminal of the battery assembly and the chassis; and a controller to determine a first insulation resistance between the positive electrode terminal and the chassis and a second insulation resistance between the negative electrode terminal and the chassis based on the first diagnosis voltage at a first time point and the second diagnosis voltage at a second time point while the first relay and the second relay are being controlled into an off-state. The controller determines a third insulation resistance between the positive electrode terminal and the chassis and a fourth insulation resistance between the negative electrode terminal and the chassis based on the first diagnosis voltage at a third time point and the second diagnosis voltage at a fourth time point while the first relay and the second relay are being controlled into an on-state. The controller detects a fault of at least one of the first relay or the second relay based on the first to fourth insulation resistances.


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    Title :

    RELAY DIAGNOSIS DEVICE, RELAY DIAGNOSIS METHOD, BATTERY SYSTEM, AND ELECTRIC VEHICLE


    Additional title:

    RELAISDIAGNOSEVORRICHTUNG, RELAISDIAGNOSEVERFAHREN, BATTERIESYSTEM UND ELEKTRISCHES FAHRZEUG
    DISPOSITIF DE DIAGNOSTIC DE RELAIS, PROCÉDÉ DE DIAGNOSTIC DE RELAIS, SYSTÈME DE BATTERIE ET VÉHICULE ÉLECTRIQUE


    Contributors:

    Publication date :

    2023-10-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen