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.
RELAY DIAGNOSIS DEVICE, RELAY DIAGNOSIS METHOD, BATTERY SYSTEM, AND ELECTRIC VEHICLE
RELAISDIAGNOSEVORRICHTUNG, RELAISDIAGNOSEVERFAHREN, BATTERIESYSTEM UND ELEKTRISCHES FAHRZEUG
DISPOSITIF DE DIAGNOSTIC DE RELAIS, PROCÉDÉ DE DIAGNOSTIC DE RELAIS, SYSTÈME DE BATTERIE ET VÉHICULE ÉLECTRIQUE
2023-10-11
Patent
Electronic Resource
English
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