An electrochemical cell having two or more diffusion bonded layers, which demonstrates a high degree of ruggedness, reliability, efficiency and attitude insensitiveness, is provided. The novel cell structure simplifies construction and operation of these cells. Also provided is a method for passive
An electrochemical cell having two or more diffusion bonded layers, which demonstrates a high degree of ruggedness, reliability, efficiency and attitude insensitiveness, is provided. The novel cell structure simplifies construction and operation of these cells. Also provided is a method for passive water removal from these cells. The inventive cell, as well as stacks made using these cells, is suitable for use in applications such as commercial space power systems, long endurance aircraft, undersea power systems, remote backup power systems, and regenerative fuel cells.
대표청구항▼
1. An electrochemical cell that comprises a membrane electrode assembly having a cathode side and an anode side, and a diffusion bonded bipolar plate assembly, the bipolar plate assembly comprising: a water flowfield;an oxygen screen/frame assembly having a screen mesh including a plurality of openi
1. An electrochemical cell that comprises a membrane electrode assembly having a cathode side and an anode side, and a diffusion bonded bipolar plate assembly, the bipolar plate assembly comprising: a water flowfield;an oxygen screen/frame assembly having a screen mesh including a plurality of openings forming fluid-flow spaces; anda hydrophilic porous plate comprising a sintered metallic porous membrane for water-gas separation, which allows water to pass and resists gas intrusion, wherein the hydrophilic porous plate is located between and diffusion bonded to the water flowfield and the oxygen screen/frame assembly,wherein, the oxygen screen/frame assembly is located on the cathode side of the membrane electrode assembly. 2. The electrochemical cell of claim 1, wherein the bipolar plate assembly further comprises the following layers: a divider plate, and a hydrogen flowfield, wherein the hydrogen flowfield is located on the anode side of the membrane electrode assembly. 3. The electrochemical cell of claim 2, wherein the bipolar plate assembly comprises: first and second divider plates and a coolant chamber between the divider plates. 4. The electrochemical cell of claim 1, wherein the sintered metallic porous membrane is a hydrophilic sintered metallic porous membrane. 5. The electrochemical cell of claim 4, which is a passive water removal PEM H2/O2 fuel cell. 6. An arranged group or stack of the electrochemical cells of claim 1. 7. The arranged group or stack of electrochemical cells of claim 6, wherein the sintered metallic porous membrane is a hydrophilic sintered metallic porous membrane. 8. The arranged group or stack of electrochemical cells of claim 6, wherein each cell has an active area, the active areas of the cells being in overlying arrangement, wherein the cell stack has internal manifolds positioned within the active areas of the cells, the internal manifolds communicating directly with these active areas. 9. The arranged group or stack of electrochemical cells of claim 8, wherein the sintered metallic porous membrane is a hydrophilic sintered metallic porous membrane. 10. The arranged group or stack of electrochemical cells of claim 6, wherein each cell has an active area, the active areas of the cells being in overlying arrangement, wherein the cell stack has external manifolds which communicate with these active areas by way of continuous flow channels located between the external manifolds and the active areas. 11. The electrochemical cell of claim 1, in which the diffusion bonded bipolar plate assembly is a fully diffusion bonded assembly. 12. The electrochemical cell of claim 1, wherein diffusion bonding of the sintered metallic porous membrane to the water flowfield and the oxygen screen/frame assembly takes place under pressure at temperatures equal to 50-90% of the sintered metallic porous membrane's melting temperature.
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이 특허에 인용된 특허 (9)
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