Fluid consuming battery with fluid regulating system
View Patent ↗The invention is an electrochemical battery cell with a fluid consuming electrode, such as an oxygen reduction electrode, and a fluid regulating system. The fluid regulating system includes a valve for adjusting the rate of passage of the fluid to the fluid consuming electrode. It is operated by an actuator that responds (e.g., by deforming) to changes in a potential applied across the actuator to open or close the valve. The applied potential can be the cell potential or an adjusted potential. The potential applied across the actuator can vary according to the need for more or less fluid in the fluid consuming electrode. The valve can be contained within the cell housing, for example between the fluid consuming electrode and one or more fluid entry ports in the cell housing, or it can be located outside the cell housing.
1. An electrochemical battery cell comprising a first fluid consuming electrode, a second electrode, a housing comprising one or more fluid entry ports for the passage of a fluid into the cell and a fluid regulating system, wherein the fluid regulating system comprises: a valve for adjusting the rate of passage of the fluid into the fluid consuming electrode; and an actuator that is capable of a dimensional change with a change in a potential applied across the actuator to operate the valve; wherein the actuator comprises at least a portion of the fluid consuming electrode.
2. The cell defined in claim 1 , wherein the potential applied across the actuator is equal to a potential between the fluid consuming electrode and the second electrode.
3. The cell defined in claim 1 , wherein the fluid regulating system further comprises a control circuit for monitoring a fluid need within the housing and applying the potential across the actuator.
4. The cell defined in claim 3 , wherein the control circuit monitors a fluid content within the housing.
5. The cell defined in claim 3 , wherein the control circuit monitors a potential between the fluid consuming electrode and the second electrode.
6. The cell defined in claim 5 , wherein the potential applied across the actuator is greater than the potential between the fluid consuming electrode and the second electrode.
7. The cell defined in claim 3 , wherein the control circuit monitors a potential between the fluid consuming electrode and a reference electrode.
8. The cell defined in claim 3 , wherein the control circuit is disposed within the cell housing.
9. The cell defined in claim 4 , wherein at least a portion of the control circuit is disposed outside the cell housing.
10. The cell defined in claim 1 , wherein the cell is a sole source of power to operate the valve.
11. The cell defined in claim 1 , wherein the valve is a non-flow inducing valve.
12. The cell defined in claim 1 , wherein the actuator is capable of bending and straightening in response to a nonuniform volumetric change within the actuator, induced by a movement of ions when the potential applied across the actuator changes.
13. The cell defined in claim 1 , wherein the actuator is capable of elongating and shortening in response to a nonuniform volumetric change within the actuator, induced by a movement of ions when the cell potential applied across the actuator changes.
14. The cell defined in claim 1 , wherein the dimensional change is responsive to a faradaic reaction within the actuator.
15. The cell defined in claim 1 , wherein the dimensional change is responsive to a capacitive charge on the actuator.
16. The cell defined in claim 1 , wherein the valve comprises a passageway and a flap, the flap comprising at least a portion of the actuator.
17. The cell defined in claim 16 , wherein the actuator comprises a single sheet with a plurality of flaps.
18. The cell defined in claim 17 , wherein the valve comprises a plurality of passageways, each having a corresponding flap.
19. The cell defined in claim 16 , wherein the valve comprises a plurality of passageways and a single flap.
20. The cell defined in claim 1 , wherein the valve comprises at least one passageway, formed by at least a partial alignment of at least one orifice in each of at least two adjacent plates, and the response of the actuator changes the relative position of the plates, thereby changing the size of the at least one passageway.
21. The cell defined in claim 20 , wherein the adjacent plates are discs that are rotated about a mutual axis by the actuator.
22. The cell defined in claim 1 , wherein the valve comprises a passageway and a plug.
23. The cell defined in claim 1 , wherein the valve comprises at least one area of high permeability surrounded by an area of low permeability to the fluid.
24. The cell defined in claim 1 , wherein the valve comprises at least one aperture defined by a surrounding area of low permeability to the fluid.
25. The cell defined in claim 1 , wherein the valve can be reversibly moved by the actuator in the open and closed directions.
26. The cell defined in claim 1 , wherein the valve and actuator are disposed within the cell housing.
27. The cell defined in claim 1 , wherein the valve is disposed between the fluid consuming electrode and the one or more fluid entry ports in the housing.
28. The cell defined in claim 1 , wherein the fluid is a gas.
29. The cell defined in claim 28 , wherein the gas comprises oxygen and the fluid consuming electrode is a gas reduction electrode.
30. The cell defined in claim 29 , wherein the cell is an air depolarized cell.
31. The cell defined in claim 29 , wherein the cell is an air assisted cell.
32. The cell defined in claim 1 , wherein the cell is fuel cell.
33. The cell defined in claim 1 , wherein the cell is a button cell.
34. The cell defined in claim 1 , wherein the cell is a cylindrical cell.
35. The cell defined in claim 1 , wherein the cell is a prismatic cell.
36. A multiple cell battery comprising at least one cell as defined in claim 1 .