RESIN-FRAMED MEMBRANE-ELECTRODE ASSEMBLY FOR FUEL CELL AND METHOD FOR MANUFACTURING THE SAME

摘要

A resin-framed membrane-electrode assembly for a fuel cell includes a stepped membrane-electrode assembly, a resin frame, and a water-impermeable layer. The stepped membrane-electrode assembly includes a solid polymer electrolyte membrane having a first surface and a second surface opposite to the first surface, a first electrode provided on the first surface, and a second electrode provided on the second surface. The second surface has an exposed surface on an area outside of an outer periphery of the second electrode. The water-impermeable layer is disposed on the exposed surface of the solid polymer electrolyte membrane so that the exposed surface is bonded to an inner protruding portion of the resin frame via the water-impermeable layer and an adhesive and so that a region of the exposed surface where the water-impermeable layer is disposed is larger than a region of the water-impermeable layer where the adhesive is applied.

主权项

1. A resin-framed membrane-electrode assembly for a fuel cell, comprising:
a stepped MEA that includes
a solid polymer electrolyte membrane having a first surface and a second surface,a first electrode on the first surface, anda second electrode on the second surface, the first electrode having a planar dimension larger than a planar dimension of the second electrode; and a resin frame member that surrounds an outer perimeter of the solid polymer electrolyte membrane, and includes a thin inner protruding portion that protrudes from an inner perimeter base end and lies on a second electrode side, wherein: the second surface of the solid polymer electrolyte membrane includes an exposed surface exposed on an outer side of the second electrode, and the exposed surface is bonded to the inner protruding portion with an adhesive, a water-impermeable layer having a frame shape is disposed on the exposed surface of the solid polymer electrolyte membrane, the water-impermeable layer occupying a region larger than a region where the adhesive is applied, and the resin frame member and the solid polymer electrolyte membrane are bonded to each other with the water-impermeable layer therebetween by using the adhesive.