Relay examination device and battery management system
The present disclosure relates to a relay examination device and a battery management system including the same, the relay examination device includes a first resistor unit having one end connected to one end of a relay, a second resistor unit having one end connected to the other end of the first resistor unit, a power unit connected to the other end of the second resistor unit and configured to supply power, and a control unit configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to examine whether the relay is open or closed or whether the relay has malfunctioned.
1. A battery management system which examines whether a relay, coupled to an electrode of a battery in which a plurality of battery cells are coupled to each other, is open or closed or whether the relay has malfunctioned, the battery management system comprising:
a relay examination device coupled to one end of the relay,
wherein the relay examination device includes:
a power unit configured to supply a current to the one end of the relay;
a voltage detection unit configured to detect a voltage from the one end of the relay; and
a control unit configured to examine whether the relay is open or closed or whether the relay has malfunctioned based on the voltage.
2. The battery management system of claim 1 , wherein the voltage detection unit includes:
a first resistor unit having a first end coupled to the one end of the relay; and
a second resistor unit having a first end coupled to a second end of the first resistor unit and a second end coupled to the power unit,
wherein the voltage detection unit detects a voltage signal applied between the first resistor unit and the second resistor unit.
3. The battery management system of claim 2 , further comprising:
a circuit protection unit having a first end coupled to the one end of the relay and a second end coupled to the first end of the first resistor unit.
4. The battery management system of claim 2 , further comprising:
a switch unit coupling the second end of the second resistor unit to the power unit,
wherein the switch unit is in a first state, among first and second states, when the switch unit receives a control signal from the control unit, and is in the second state when no control signal is received from the control unit.
5. The battery management system of claim 2 , further comprising:
an analog-digital converter configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to convert the voltage signal into a digital signal,
wherein the control unit receives the digital signal and examines whether the relay is open or closed or whether the relay has malfunctioned.
6. A relay examination device, which examines a relay coupled to an electrode of a battery for supplying a power to a system, comprising:
a first resistor unit having a first end coupled to one end of the relay;
a second resistor unit having first end coupled to a second end of the first resistor unit;
a power unit coupled to a second end of the second resistor unit and configured to supply power; and
a control unit configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to examine whether the relay is open or closed or whether the relay has malfunctioned,
wherein the power unit, the first resistor, the second resistor and the relay constitute a circuit loop excluding the battery and the system.
7. The relay examination device of claim 6 , further comprising:
an analog-digital converter configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to convert the voltage signal into a digital signal,
wherein the control unit examines whether the relay is open or closed or whether the relay has malfunctioned in response to receiving the digital signal.
8. The relay examination device of claim 6 , further comprising:
a switch unit coupling the second end of the second resistor unit to the power unit.
9. The relay examination device of claim 8 , wherein the switch unit is in a first state, among first and second states, when the switch unit receives a control signal from the control unit, and is in the second state when no control signal is received from the control unit.
10. The relay examination device of claim 6 , further comprising:
a circuit protection unit having a first end coupled to the one end of the relay and a second end coupled to the first end of the first resistor unit.
11. A relay examination device, comprising:
a power source;
a voltage divider having two resistive elements and coupled to the power source, the voltage divider being configured to be coupled to an end of a relay in a battery system to determine a state of the relay; and
a controller configured to receive an output voltage from a node between the two resistive elements of the voltage divider to determine a state of the relay,
wherein the value of the output voltage is in accordance with the values of the two resistive elements of the voltage divider and an input voltage of the power source when the switch is closed, and
wherein the value of the output voltage is in accordance with the values of the two resistive elements of the voltage divider, another resistance value, and the input voltage of the power source when the switch malfunctions.