Separator for fuel cell and separator assembly and fuel cell stack including the same

A separator assembly for a fuel cell, the separator assembly comprising:

• a first separator having a plate shape, the first separator comprising:
• a plurality of first manifolds through which reaction gas or cooling water is introduced or discharged;
• and
• a first molding gasket surrounding an inner edge of at least one first manifold selected from among the plurality of first manifolds, the first molding gasket being configured to prevent corrosion, wherein the first molding gasket integrally surrounds upper, side, and bottom surfaces of the inner edge of the at least one first manifold selected from among the plurality of first manifolds and wherein the first molding gasket surrounds all of the inner edges of the selected manifold to define a closed loop;
• and
• a second separator having the plate shape and bonded to the first separator, the second separator comprising:
• a plurality of second manifolds in communication with the plurality of first manifolds through which the reaction gas or the cooling water is introduced or discharged;
• and
• a second molding gasket surrounding an inner edge of at least one second manifold selected from among the plurality of second manifolds, the second molding gasket being configured to prevent corrosion.

A fuel cell stack comprising:

• a plurality of unit cells provided in a stack, each unit cell comprising a membrane electrode assembly, a pair of gas diffusion layers, a first separator, and a second separator;
• wherein the first separator and the second separator facing each other in adjacent unit cells are bonded to each other and integrated;
• wherein the first separator has a plate shape and comprises:
• a plurality of first manifolds through which reaction gas or cooling water is introduced or discharged;
• and
• a first molding gasket surrounding an inner edge of at least one first manifold selected from among the plurality of first manifolds, the first molding gasket being configured to prevent corrosion, wherein the first molding gasket integrally surrounds upper, side, and bottom surfaces of the inner edge of the at least one first manifold selected from among the plurality of first manifolds and wherein the first molding gasket surrounds all of the inner edges of the selected manifold to define a closed loop;
• and
• wherein the second separator has the plate shape and is bonded to the first separator, the second separator comprising:
• a plurality of second manifolds in communication with the plurality of first manifolds through which the reaction gas or the cooling water is introduced or discharged;
• and
• a second molding gasket surrounding an inner edge of at least one second manifold selected from among the plurality of second manifolds.