Patent ID: 6783883
Filing Date: 2004-08-31
Classification: C25B,H01M,Y02E,Y10T

Abstract:
Assembly composed of a membrane-electrode unit â€œMEAâ€  (8, 4a, 4b) and a bipolar plate (1) of a fuel cell as component of a fuel cell stack, wherein the MEA comprises a polymer electrolyte membrane (8) and a gas diffusion layer (4a, 4b) resting in the assembly on the membrane with the exception of the membrane periphery, with the bipolar plate (1) resting against the side of the gas diffusion layer opposite the membrane and protruding over the periphery of the gas diffusion layer while forming a circumferential marginal volume zone that is defined at the top, inner and bottom sides by the bipolar plate (1), the gas diffusion layer (4a, 4b) and the membrane (8), characterized in that the circumferential volume zone is filled with a cured adhesive (7) all the way to its defining faces in a gap-free and gas-tight manner.