Protective device, energy storage apparatus, and method for reducing contact resistance of relay
A protective device includes a relay having a contact that opens and closes a current path of a cell, and a control device that controls the relay. The control device executes a reduction processing of reducing a contact resistance of the relay.
1. A protective device comprising:
a relay including a contact that opens and closes a current path of a cell;
a bypass circuit connected in parallel to the relay; and
a control device that controls the relay and the bypass circuit,
wherein the control device executes a reduction processing of reducing a contact resistance of the relay, and
wherein the control device executes the reduction processing when a current of the cell is equal to or less than a predetermined value and a CLOSE state of the contact continues for a predetermined period.
2. The protective device according to claim 1 , wherein the control device detects a failure of the relay using the bypass circuit.
3. The protective device according to claim 1 , wherein the reduction processing comprises a processing of successively opening and closing the contact a plurality of times or a processing of energizing the relay.
4. The protective device according to claim 1 , wherein
the cell is used for a vehicle, and
the control device executes the reduction processing during parking.
5. The protective device according to claim 4 , wherein the cell is used for engine startup.
6. An energy storage apparatus comprising:
a cell; and
the protective device according to claim 1 .
7. The protective device according to claim 1 , wherein when a parking of a vehicle is determined to continue for the predetermined period of time or more, the reduction processing is executed.
8. The protective device according to claim 1 , wherein after the reduction processing is executed, the contact is controlled to the CLOSE state, and when the predetermined period elapses again after the contact is in the CLOSE state, the processing proceeds to repeat the reduction processing.
9. A method for reducing a contact resistance of a relay, the method comprising:
detecting a failure of the relay using a bypass circuit connected in parallel to the relay located in a current path of a cell;
opening and closing, or energizing the relay; and
executing a reduction processing to reduce a contact resistance of the relay when a current of the cell is equal to or less than a predetermined value and a CLOSE state of the contact continues for a predetermined period.
10. The method according to claim 9 , wherein the reduction processing comprises opening and closing the contact a plurality of times or energizing the relay.
11. The method according to claim 9 , wherein the reduction processing is executed during parking of a vehicle.
12. The method according to claim 9 , wherein the executing of the reduction processing is performed during engine startup of a vehicle.
13. A computer readable medium storing instructions comprising the method according to claim 9 .
14. A protective device comprising:
a relay including a contact that opens and closes a current path of a cell; and
a control device that controls the relay,
wherein the control device executes a reduction processing of reducing a contact resistance of the relay,
wherein the control device executes the reduction processing when a current of the cell is equal to or less than a predetermined value.
15. The protective device according to claim 14 , wherein the control device executes the reduction processing when the current of the cell is equal to or less than the predetermined value and a CLOSE state of the contact continues for a predetermined period.
16. The protective device according to claim 14 , further comprising
a bypass circuit connected in parallel to the relay, and
wherein the control device controls the relay and the bypass circuit.
17. The protective device according to claim 16 , wherein the control device detects a failure of the relay using the bypass circuit.
18. The protective device according to claim 14 , wherein the reduction processing comprises a processing of successively opening and closing the contact a plurality of times or a processing of energizing the relay.
19. The protective device according to claim 14 , wherein
the cell is used for a vehicle, and
the control device executes the reduction processing during parking.
20. An energy storage apparatus comprising:
a cell; and
the protective device according to claim 14 .