Patent ID: 8703353

Claim:
A separator for a fuel cell, comprising: a flow field plate having a porous plate structure and bonded to an outer surface of a gas diffusion layer to form a reaction gas flow field; and a main body plate bonded to an outer surface of the flow field plate to seal the reaction gas flow field, wherein the flow field plate has protrusions that protrude from both surfaces of the flow field plate in a repetitive pattern while forming an uneven structure, and the flow field plate has a land portion bonded to the gas diffusion layer at a sharp tip of a protrusion thereof protruding from one surface of the flow field plate and a bonding portion bonded to the main body plate at an opposite sharp tip of a protrusion thereof protruding from the other surface of the flow field plate, wherein the flow field plate is made of a single metal plate having a plurality of apertures, and the protrusions are depressions pressed into the metal plate and formed in a repetitive embossing pattern, and wherein each aperture in said plurality of apertures is located on a flat face on the protrusion's surface, and said each aperture is shaped as a circular opening, and wherein the outer perimeter of said flat face has a hexagonal shape.