Patent ID: 8067128

Claim:
A method for manufacturing a multi-layered sealing structure for a fuel cell forming a step shape, the structure of the fuel cell having a first gas separator plate ( 1 ) and a first diffusion layer ( 2 ) disposed on one side of a two-sided proton exchange membrane ( 3 ) which has catalyst coated on each side thereof and a second gas separator plate ( 6 ), a second gas diffusion layer ( 4 ) and circular sealing gaskets ( 7 ) disposed on the opposite side of the proton exchange membrane( 3 ), comprising: preparing the first gas separator plate ( 1 ) and the first gas diffusion layer ( 2 ) on one side of the proton exchange membrane ( 3 ) and the second gas diffusion layer ( 4 ) on the other side of the proton exchange membrane ( 3 ), and disposing at least a pair of through-holes ( 10 ) as hydrogen channels through each plate and layer, wherein the first gas diffusion layer ( 2 ) and the proton exchange membrane ( 3 ) have the same area and shape which is smaller than that of the first gas separator plate ( 1 ), but larger than that of the second gas diffusion layer ( 4 ); piling the proton exchange membrane ( 3 ) and the gas diffusion layers ( 2 , 4 ) with the different areas described above in size-decreasing order on top of the first gas separator plate ( 1 ) to form a step-shaped stack structure; infusing sealing material ( 8 , 9 ) into the resulting sealing area formed with a reverse step shape; placing a non-adhesive flat plate or sheet having an area and shape not smaller than that of the first gas separator plate ( 1 ) on the second gas diffusion layer ( 4 ), so that it covers the area of the first gas separator plate ( 1 ), and applying compressing force in a longitudinal direction to bond both the upper ends and the lower ends thereof, which have been dispensed and spread with adhesive respectively, with the surfaces of the adjacent plates and diffusion layers; curing the plates and layers bonded together for 10-24 hours; removing the non-adhesive flat plate or sheet; and placing a second gas separator plate ( 6 ) on top of the bonded second gas diffusion layer ( 4 ), and applying a compressing force in a longitudinal direction to form a single cell.