The invention provides a relay detection device. A relay control circuit comprises a negative electrode relay, a positive electrode relay, a pre-charging relay, a pre-charging resistor and a motor. The detection device comprises a detection circuit and a controller, wherein the detection circuit comprises a first resistor whose first end is connected with the second end of the negative electrode relay, a first switch whose first end is connected with the second end of the first resistor, and a first current sensor whose first end is connected with the second end of the first switch and second end is connected with the first end of the negative electrode relay; and the controller is used for controlling the first switch to be closed when the negative electrode relay is closed or opened and judging whether the state of the negative electrode relay is normal according to current acquired by the first current sensor. According to the relay detection device of the embodiment, failure of the relay can be timely found out, a battery management system or an overall vehicle management system can timely make a decision according to the failure, safety of the power battery can be ensured, and the purpose of protecting person safety can be achieved.
Relay detection device
2015-08-12
Patent
Elektronische Ressource
Englisch
Europäisches Patentamt | 2021
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