Polymer electrolyte membrane fuel cell stack
A fuel cell includes a stack of electrolyte membranes joined to one another to form an interior space and an exterior space. Fuel, such as hydrogen, is provided to the interior space. The electrolyte membranes are circular and joined to adjacent membranes at the outer perimeters to enclose the interior space. A stack of such membrane assemblies is provided on a shaft and is rotated within a housing to drive off byproduct water. The water is collected and recirculated by spraying over the fuel cell stack for cooling and hydration.
1. A fuel cell for converting a fuel gas and an oxidant gas to electrical power, comprising:
a fuel cell membrane assembly including a support structure and a plurality of fuel cell membrane portions mounted on said support structure to define an interior space, said fuel cell membrane portions each comprise a pair of disk shaped membranes mounted spaced from one another at a central portion and angled toward one another at a perimeter thereof,
an edge clip joining the perimeters of said pairs of said disk shaped membranes to one another,
a plurality of elongated support members extending substantially radially inward from said edge clip to between said pairs of said membranes;
a connection to feed the fuel gas to said interior space;
a housing in which said fuel cell membrane assembly is mounted; and
a drive connected to move said fuel cell membrane assembly so as to drive off byproduct water produced during operation of said fuel cell.
2. A fuel cell as claimed in claim 1 , wherein said housing includes a water collection sump.
3. A fuel cell as claimed in claim 1 , further comprising:
a water recirculating system connected to said sump, said water recirculating system connected to supply water collected in said sump to said fuel cell membrane assembly.
4. A fuel cell as claimed in claim 1 , further comprising:
a purge apparatus connected to said water recirculating system.