Patent ID: 7294426

Claim:
A sealing structure for sealing a single fuel cell, comprising: a membrane electrode assembly, including an anode side with an anode gas diffusion layer, a cathode side with a cathode gas diffusion layer, and a proton exchange membrane mounted between the anode gas diffusion layer and the cathode gas diffusion layer; an anode plate mounted to the anode gas diffusion layer of the membrane electrode assembly, which comprises a first surface facing to the anode gas diffusion layer of the membrane electrode assembly, a second surface, a central portion, a circumferential portion and a plurality of ports formed at the circumferential portion, in which the first surface is formed with a plurality of anode gas channels at the central portion, a peripheral groove at the circumferential portion and an extended groove around the ports in communication with the peripheral groove; and a cathode plate mounted to the cathode gas diffusion layer of the membrane electrode assembly, which comprises a first surface, a second surface facing to the cathode gas diffusion layer of the membrane electrode assembly, a central portion, a circumferential portion and a plurality of ports formed at the circumferential portion, in which the second surface is formed with a plurality of cathode gas channels at the central portion, a peripheral groove at the circumferential portion and an extended groove around the ports in communication with the peripheral groove; wherein in assembly of the single fuel cell, a silicone rubber is respectively applied to the peripheral groove and the extended groove at the first surface of the anode plate and the peripheral groove and the extended groove at the second surface of the cathode plate, and before the silicone rubbers have cured, the anode plate, the membrane electrode assembly and the cathode plate are stacked and compressed with a predetermined compression pressure, such that the silicone rubber at the peripheral groove of the anode plate binds correspondingly to the silicone rubber at the peripheral groove of the cathode plate to form a tight seal at the circumferential portions between the anode plate and the cathode plate, and the proton exchange membrane of the membrane electrode assembly has an entire periphery thereof tightly sandwiched between and surrounded by the silicone rubber at the extended groove of the anode plate and the silicone rubber at the extended groove of the cathode plate to form a tight seal around the ports between the anode plate and cathode plate.