Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1995-09-01
1996-05-07
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
429 31, 429 34, H01M 810
Patent
active
055144861
ABSTRACT:
A stack of polymer electrolyte fuel cells is formed from a plurality of unit cells where each unit cell includes fuel cell components defining a periphery and distributed along a common axis, where the fuel cell components include a polymer electrolyte membrane, an anode and a cathode contacting opposite sides of the membrane, and fuel and oxygen flow fields contacting the anode and the cathode, respectively, wherein the components define an annular region therethrough along the axis. A fuel distribution manifold within the annular region is connected to deliver fuel to the fuel flow field in each of the unit cells. In a particular embodiment, a single bolt through the annular region clamps the unit cells together. In another embodiment, separator plates between individual unit cells have an extended radial dimension to function as cooling fins for maintaining the operating temperature of the fuel cell stack.
REFERENCES:
patent: 4824742 (1989-04-01), Parry
patent: 5158837 (1992-10-01), Misawa et al.
patent: 5176967 (1993-01-01), Ishihara et al.
patent: 5185219 (1993-02-01), Ishihara et al.
patent: 5186806 (1993-02-01), Clark et al.
Neutzler et al., Development of a Portable Air-Breathing Polymer Electrolyte Fuel Cell Stack, Extended Abstracts vol. 94-2, p. 961, Oct. 1994.
K. Prater "Solid polymer fuel cell developments at Ballard", Journal of Power Sourcer, 37, 181-188 (1992) month not avail.
Skapars Anthony
The Regents of the University of California, Office of Technolog
Wilson Ray G.
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