Seal for fuel cell and forming method therefor
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsToshihiko Suenaga, Masajirou Inoue, Nobuaki Kimura
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Abstract
A seal in a fuel cell for sealing a membrane electrode assembly comprises a pair of catalytic electrode layers, a polymerized electrolytic membrane held between the catalytic layers, and a gas diffusion layer layered on the outer surface of the catalytic electrode layer. The seal is integrally formed with the polymerized electrolytic membrane. The height thereof is greater than that of the gas diffusion layer. The difference between the heights of the polymerized electrolytic membrane and the gas diffusion layer is constant.
Claims8
A seal in a fuel cell for sealing a membrane electrode assembly comprising:
- a pair of catalytic electrode layers,
- a polymerized electrolytic membrane held between the catalytic layers, and
- a gas diffusion layer layered on the outer surface of the catalytic electrode layer;
- wherein the seal is integrally formed with the polymerized electrolytic membrane, the height thereof is greater than that of the gas diffusion layer, and the difference between the heights of the polymerized electrolytic membrane and the gas diffusion layer is constant.
A method for forming a seal in a fuel cell for sealing a membrane electrode assembly comprising:
- a pair of catalytic electrode layers,
- a polymerized electrolytic membrane held between the catalytic layers, and
- a gas diffusion layer layered on the outer surface of the catalytic electrode layer;
- wherein the membrane electrode assembly is set in a forming die having a cavity in which the seal is integrally formed with the polymerized electrolytic membrane;
- the die is clamped so as to load predetermined pressure on the membrane electrode assembly;
- and
- a material for the seal is charged into the cavity.
Dependencies are inferred from the claim text.