Separator module for fuel cells and unit cell for fuel cells including the same

A unit cell for fuel cells, comprising:

• a membrane-electrode assembly (MEA);
• a pair of gas diffusion layers (GDLs) disposed at both surfaces of the MEA;
• and
• a pair of separators disposed at an outside of the pair of GDLs,
• wherein at least one separator of the pair of separators is provided as a porous separator module;
• and
• wherein the porous separator module comprises:
• a separator main body comprising (i) a pair of manifold parts disposed at both ends of the separator main body and (ii) a plurality of manifolds configured to receive or discharge reaction gas;
• a main body reaction part disposed between the pair of manifold parts and configured to receive the reaction gas;
• a pair of main body diffusion parts disposed between the main body reaction part and the pair of manifold parts, and configured to diffuse the reaction gas;
• and
• a porous body disposed at a surface of the separator main body in a region corresponding to the main body reaction part and the pair of main body diffusion parts,
• wherein the porous body comprises:
• a porous body reaction part disposed at a region corresponding to the main body reaction part, and having a plurality of flow holes configured to pass the reaction gas therethrough;
• and
• a pair of porous body diffusion parts extending from both ends of the porous body reaction part up to regions corresponding to the main body diffusion parts,
• wherein a plurality of diffusion channels and a plurality of diffusion lands are alternately disposed at the main body diffusion parts,
• wherein the plurality of diffusion channels are configured to diffuse the reaction gas in a direction toward the main body reaction part and the plurality of diffusion lands are configured to support the pair of porous body diffusion parts,
• wherein the unit cell further comprises a pair of sub-gaskets that surround and support an edge of the MEA and that are provided in regions corresponding to the pair of main body diffusion parts,
• wherein each of the pair of porous body diffusion parts is disposed between one of the pair of main body diffusion parts and one of the pair of sub-gaskets, and
• wherein one surface of each of the pair of porous body diffusion parts comes into surface contact with a corresponding one of the pair of sub-gaskets throughout all areas of the one surface while facing the corresponding one of the pair of sub-gaskets.