| CPC H01M 8/0258 (2013.01) [H01M 8/0232 (2013.01); H01M 8/0254 (2013.01); H01M 8/0273 (2013.01); H01M 8/04089 (2013.01); H01M 8/0494 (2013.01); H01M 8/1004 (2013.01); H01M 8/026 (2013.01)] | 14 Claims |
|
1. A power generation cell comprising:
a resin frame equipped membrane electrode assembly; and
a pair of metal separators provided on both sides of the resin frame equipped membrane electrode assembly, a compression load being applied to the power generation cell in a separator thickness direction,
the resin frame equipped membrane electrode assembly comprising:
a membrane electrode assembly formed by holding an electrolyte membrane between a first electrode and a second electrode; and
a resin frame member fixed to the membrane electrode assembly on an outer peripheral side of a power generation area of the membrane electrode assembly,
wherein the resin frame equipped membrane electrode assembly includes an overlap part where an internal peripheral portion of the resin frame member is held between an outer peripheral portion of the first electrode and an outer peripheral portion of the second electrode;
each of the pair of metal separators includes a separator body in a form of a plate;
the separator body is provided with
a support part protruding from a reference surface of the separator body toward the overlap part and configured to contact the overlap part to support the overlap part;
a flow field forming protrusion protruding from the support part toward the power generation area and configured to contact the power generation area and form a reactant gas flow field as a passage of a reactant gas;
and
a seal part configured to contact the resin frame member and prevent leakage of the reactant gas or a coolant as fluid;
the seal part comprises a metal bead;
each of the flow field forming protrusion, the support part, and the metal bead is formed integrally with, and protrudes from the separator body in a manner that the flow field forming protrusion, the support part, and the metal bead are configured to be deformed elastically by application of the compression load;
the second electrode includes an inclined part inclined from the power generation area toward the overlap part, opposite to the first electrode,
the separator body forming a metal separator adjacent to the second electrode, among the pair of metal separators, is provided with a step connecting the flow field forming protrusion to the support part directly and configured to position a protruding end surface of the support part toward a side opposite to the electrolyte membrane, beyond a protruding end surface of the flow field forming protrusion,
the step comprises an inclined surface inclined from the flow field forming protrusion toward the support part, opposite to the second electrode, and
a relationship of P1>P2>P3 is satisfied,
where P1 indicates a first surface pressure applied from the seal part to the resin frame member, P2 indicates a second surface pressure applied from the support part to the overlap part, and P3 indicates a third surface pressure applied from the flow field forming protrusion to the power generation area.
|