Fuel cell assembly with structural film
An assembly for use in a fuel cell comprising a first membrane having an inner portion and an outer peripheral portion; a second membrane having a corresponding inner portion to the inner portion of the first membrane, and a corresponding outer peripheral portion to the outer peripheral portion of the first membrane; a structural film layer disposed between at least part of the outer peripheral portion of first membrane and the corresponding outer peripheral portion of the second membrane; and the inner portion of the first membrane contacting the corresponding inner portion of the second membrane to provide ionic communication between the first membrane and the second membrane. The structural film provides added strength and stability to the assembly.
1 . An assembly for use in a fuel cell comprising:
(a) a first membrane having an inner portion and an outer peripheral portion;
(b) a second membrane having a corresponding inner portion to said inner portion of said first membrane, and a corresponding outer peripheral portion to said outer peripheral portion of said first membrane;
(c) a structural film layer disposed between at least part of said outer peripheral portion of said first membrane and said corresponding outer peripheral portion of said second membrane; and
(d) said inner portion of said first membrane contacting said corresponding inner portion of said second membrane to provide ionic communication between said first membrane and said second membrane.
2 . An assembly as defined in claim 1 further comprising a cathode on said first membrane and an anode on said second membrane.
3 . An assembly as defined in claim 1 wherein said structural film layer is less than about 0.003 inches thick.
4 . An assembly as defined in claim 1 wherein said outer peripheral portion of said first membrane and said corresponding outer peripheral portion of said second membrane each has an edge, each of said edges extending substantially coextensively, and wherein said structural film layer is flush with said edges.
5 . An assembly as defined in claim 1 wherein said outer peripheral portion of said first membrane and said corresponding outer peripheral portion of said second membrane each has an edge, each of said edges extending substantially coextensively, and wherein said structural film layer extends beyond said edge and optionally has a sealing gasket disposed on at least one side thereof.
6 . An assembly as defined in claim 1 wherein said outer peripheral portion of said first membrane and said corresponding outer peripheral portion of said second membrane and said structural film layer each has an edge, each of said edges extending substantially coextensively, and wherein a sealing gasket is disposed on at least one edge of said assembly and is integrally attached to said first membrane, said second membrane, and said structural film layer.
7 . An assembly as defined in claim 1 wherein said structural film layer is disposed between the entirety of said outer peripheral portion of said first membrane and said corresponding outer peripheral portion of second membrane.
8 . An assembly as defined in claim 2 further comprising a first gas diffusion medium disposed over said cathode and a second gas diffusion medium disposed over said anode.
9 . An assembly as defined in claim 8 wherein said outer peripheral portion of said first membrane, said corresponding outer peripheral portion of said second membrane, said structural film layer, said first gas diffusion medium, and said second gas diffusion medium each has an edge, each said edge extending substantially coextensively, and wherein a sealing gasket is integrally attached at said edge to said first membrane, said second membrane, said structural film layer, said first gas diffusion medium, and said second gas diffusion medium.