A battery pack including first and second battery contactors respectively having first ends electrically connected to positive and negative electrode terminals of a battery; first and second charging contactors respectively having first ends electrically connected to second ends of the first and second battery contactors; a second power connector of a charger having first and second output terminals respectively electrically connected to the first and second input terminals being connected to the first power connector; and a control unit configured to, when a second power connector of a charger is electrically connected to the first power connector, receive a charging end request signal from the charger, control changes of the first and second charging contactors between turn-on and turn-off states, and diagnose a fault of each of the first and second charging contactors based on first, second or third measured voltages across the first, second or third resistors, respectively.
1. A battery pack, comprising:
a first battery contactor, wherein a first end of the first battery connector is configured to be electrically connected to a positive electrode terminal of a battery;
a second battery contactor, wherein a first end of the second battery connector is configured to be electrically connected to a negative electrode terminal of the battery;
a first charging contactor, wherein a first end of the first charging contactor is electrically connected to a second end of the first battery contactor;
a second charging contactor, wherein a first end of the second charging contactor is electrically connected to a second end of the second battery contactor;
a first measurement resistor electrically connected between a first node located at the first end of the second charging contactor and a second node located at the first end of the first charging contactor;
a second measurement resistor electrically connected between the first node and a third node located at a second end of the first charging contactors;
a third measurement resistor electrically connected between the first node and a fourth node located at a second end of the second charging contactor;
a first power connector having:
a first input terminal electrically connected to the second end of the first charging contactor; and
a second input terminal electrically connected to the second end of the second charging contactor; and
a control unit configured to, when first and second output terminals of a second power connector of a charger are electrically connected to the first input terminal and the second input terminal of the first power connector, respectively:
receive a charging end request signal from the charger;
control changes of the first charging contactor and the second charging contactor between a turn-on state and a turn-off state in order; and
diagnose a fault of each of the first charging contactor and the second charging contactor based on at least one of a first measured voltage measured across the first measurement resistor, a second measured voltage measured across the second measurement resistor, or a third measured voltage measured across the third measurement resistor.
2. The battery pack according to claim 1 ,
wherein the control unit is configured to:
control the second charging contactor to change from the turn-on state to the turn-off state; and
determine a turn-off fault of the second charging contactor based on the third measured voltage that is measured while the second charging contactor is in the turn-off state.
3. The battery pack according to claim 2 ,
wherein when the third measured voltage is less than a second reference voltage, the control unit is configured to determine that a turn-off fault occurs at the second charging contactor.
4. The battery pack according to claim 1 ,
wherein the control unit is configured to:
diagnose a fault of the second charging contactor based on the third measured voltage;
control the first charging contactor to change from the turn-on state to the turn-off state; and
determine a turn-off fault of the first charging contactor based on a measured voltage difference between the first measured voltage and the second measured voltage that are measured while the first charging contactor is in the turn-off state.
5. The battery pack according to claim 4 ,
wherein when the measured voltage difference between the first measured voltage and the second measured voltage is smaller than a first reference voltage, the control unit is configured to determine that a turn-off fault occurs at the first charging contactor.
6. The battery pack according to claim 1 ,
wherein when it is determined that a fault occurs in at least one of the first charging contactor and the second charging contactor, the control unit is configured to output a fault signal.
7. A vehicle, comprising a battery pack according to claim 1 .