An electrochemical cell or cell system includes an air mover, such as a fan, and one or more pressure-sensitive mechanisms, such as a slit valve, that allow air to enter or to exit the cell or system.
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What is claimed is: 1. An electrochemical cell system, comprising: a housing having a first end including an air access opening and a second end having an air access opening; a metal-air cell in the housing; a plenum between the housing and the metal air cell that allows air to flow from the first
What is claimed is: 1. An electrochemical cell system, comprising: a housing having a first end including an air access opening and a second end having an air access opening; a metal-air cell in the housing; a plenum between the housing and the metal air cell that allows air to flow from the first end of the housing to the second end of the housing; fan in fluid communication with the metal-air cell and positioned near the first end of the housing; a first pressure-sensitive valve, positioned near the first end of the housing and the fan, in fluid communication with and responsive to the fan; and a second pressure sensitive valve, positioned near the second end of the housing, in fluid communication with and responsive to the fan, wherein the first valve, the second valve, and the fan are capable of regulating air flow to the metal air cell, and wherein when the fan is activated air is drawn into the system through the air access opening in the first end of the housing, then passes through the first valve, then passes through the plenum and contacts the metal-air cell, then passes through the second valve, and then passes through the air access opening in the second end of the housing and out of the system. 2. The system of claim 1, wherein the valve comprises a movable portion capable of moving in a first direction and a second direction opposite to the first direction. 3. The system of claim 1, wherein the valve comprises a movable portion capable of moving in only one direction. 4. The system of claim 1, wherein the first valve and the second valve are impermeable to water and carbon dioxide. 5. The system of claim 1, wherein the first valve comprises a metal. 6. The system of claim 1, wherein the fan is upstream of the first valve along an air flow path into the housing. 7. The system of claim 1, wherein the fan is downstream of the first valve along an air flow path into the housing. 8. The system of claim 1, wherein the housing comprises an elongate, hollow structure extending along the housing and the metal-air cell is within the elongate hollow structure. 9. The system of claim 1, comprising a plurality of metal-air cells in the housing. 10. The system of claim 1, wherein the housing is cylindrical. 11. The system of claim 1, wherein the housing is prismatic. 12. The system of claim 1, wherein the metal-air cell comprises a material having a gas permeability across a first portion of the material that is different than gas permeability across a second portion of the material. 13. The system of claim 1, wherein the first pressure-sensitive valve comprises a stationary portion and a movable portion responsive to the air mover, the movable portion capable of moving relative to the stationary portion to define a variable gap between the portions. 14. A metal-air cell having a first end and a second end and further, comprising: a cathode; fan in fluid communication with the cathode and positioned near the first end of the metal-air cell; and a first pressure-sensitive valve, positioned near the first end of the metal-air cell and in fluid communication with and responsive to the fan; and a second pressure sensitive valve positioned near the second end of the metal-air cell in fluid communication with and responsive to the fan, wherein the first valve, the second valve, and the fan are capable of regulating air flow to the metal-air cell, and wherein when the fan is activated air is drawn through the first valve and into the metal-air cell to contact the cathode, and then passes out of the metal-air cell and through the second valve. 15. The cell of claim 14 wherein the first valve comprises a movable portion capable of opening in only one direction. 16. The cell of claim 14, wherein the first valve and the second valve are impermeable to water and carbon dioxide. 17. The cell of claim 14, wherein the first valve comprises a metal. 18. The cell of claim 14, wherein the fan is upstream of the first valve along an air flow path to the cathode. 19. The cell of claim 14, wherein the fan is downstream of the first valve along an air flow path to the cathode. 20. The cell of claim 14, further comprising a housing, wherein the cathode, the fan, and the second valve are in the housing. 21. The cell of claim 14, wherein the first pressure-sensitive valve comprises a stationary portion and a movable portion responsive to the air mover, the movable portion capable of moving relative to the stationary portion to define a variable gap between the portions.
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