Abstract: A separator for a fuel cell includes a metal plate which defines a passage and a manifold, frames having gaskets which are integrated therewith using injection, and a bonding unit for bonding the frames to the metal plate. The gaskets may be differently formed. This resolves process interference problems between conductive surface treatment and gasket cross-linking, obviates deburring of the gasket, and preventes poor injection of the gaskets, which ensures stable quality of the separator, increases productivity and decreases the manufacturing cost.

Abstract: The present invention provides an improved metal separator for a fuel cell and a method for preparing same. More particularly, the invention provides a metal separator for a fuel cell, whereby the separator has a surface structure that imparts reduced contact resistance, improved corrosion resistance, and stable electrical conductivity. The invention further provides a surface treatment method for making the metal separator of the invention. The inventive method comprises sintering Fe—Cr—B—V-based powder on the surface of a metal foam to form an alloy layer; and forming a nitride layer of a (Cr—V—B)N-based material while supplying nitrogen gas on the surface of the alloy layer.

Abstract: The present invention provides a fuel cell separator having an airtight gasket, in which a gasket is integrally injection-molded in a region that requires airtightness of a fuel cell separator to maintain airtightness of each flow field of the separator and to smoothly guide the fluid flow in each flow field. For this purpose, the present invention provides a fuel cell separator having an airtight gasket, which is integrally injection-molded on both surfaces of the separator to form a closed curve.

Abstract: Disclosed herein is a fuel cell stack structure, including: metallic bipolar plates having cooling surfaces facing each other, wherein film-removed portions are provided at portions of the cooling surfaces. The fuel cell stack structure is advantageous in that electrical conductivity can be achieved by the contact portion of two metallic bipolar plates without having to apply a conductive material onto the contact site of the cooling surfaces of the metallic bipolar plates, so that the manufacturing cost of the metallic bipolar plate can be reduced, thereby reducing the manufacturing cost a fuel cell stack.

Abstract: The present invention preferably provides a separator for a fuel cell, in which a strength reinforcing means is integrally formed in a region, which is not supported by a gasket, over the region from manifolds, through which reactant gases and coolant are supplied, to a reaction flow field, in which a reaction takes place, thus suitably preventing local deformation of the separator.

Abstract: The present invention provides a fuel cell separator with a gasket manufactured by integrally forming a gasket on one side of a separator; independently injection molding a frame gasket on a frame such that a first airtight portion covers the entire surface of the frame to maintain the shape of the frame gasket and a second airtight portion projects upward and downward from both ends of the first airtight portion; and bringing the first airtight portion of the frame gasket into contact with the other side of the separator with the gasket formed on one side thereof. To create a fuel cell stack in certain embodiments, the invention stacks the second airtight portion of the frame gasket on another second airtight portion of an adjacent unit cell with a membrane-electrode assembly interposed therebetween.

Abstract: The present invention provides a fuel cell stack with a water drainage structure, which can effectively drain condensed water and prevent water from flowing into unit cells by combining an end anode plate (EAP) and an end cathode plate (ECP), which are formed by modifying an anode plate (AP) and cathode plate (CP) respectively.

Abstract: The present invention provides an improved metal separator for a fuel cell and a method for preparing same. More particularly, the invention provides a metal separator for a fuel cell, whereby the separator has a surface structure that imparts reduced contact resistance, improved corrosion resistance, and stable electrical conductivity. The invention further provides a surface treatment method for making the metal separator of the invention. The inventive method comprises sintering Fe—Cr—B—V-based powder on the surface of a metal foam to form an alloy layer; and forming a nitride layer of a (Cr—V—B)N-based material while supplying nitrogen gas on the surface of the alloy layer.

Abstract: The present invention provides a fuel cell separator with a gasket and a method for manufacturing the same, which can prevent corrosion of the separator and improve corrosion resistance of the separator. In particular, the present invention provides a fuel cell separator with a gasket and a method for manufacturing the same, in which an adhesive is coated on the entire or partial surface of the separator, preferably by screen printing. A process of integrally molding a gasket to the separator is then performed such that the edges of the separator are not exposed to the outside after the injection molding process but, rather, are coated with the resin adhesive. The present invention thereby prevents corrosion of the separator, improves corrosion resistance of the separator, and prevents formation of burrs during the injection molding process.

Abstract: The present invention provides a metal separator for a fuel cell, which is surface-treated to have high electrical conductivity and electrochemical corrosion resistance, and a method for treating the surface of the same. The metal separator may include an amorphous carbon film formed on the surface of a separator substrate, the amorphous carbon film being carbonized by heat treatment to increase the proportion of sp2. The surface treatment method may include: forming an amorphous carbon film on the surface of a separator substrate; and carbonizing the amorphous carbon film by heat treatment. Fuel cells having the metal separator can show excellent performance.

Abstract: The present invention preferably provides a separator for a fuel cell, in which a strength reinforcing means is integrally formed in a region, which is not supported by a gasket, over the region from manifolds, through which reactant gases and coolant are supplied, to a reaction flow field, in which a reaction takes place, thus suitably preventing local deformation of the separator.

Abstract: The present invention provides a fuel cell separator having an airtight gasket, in which a gasket is integrally injection-molded in a region that requires airtightness of a fuel cell separator to maintain airtightness of each flow field of the separator and to smoothly guide the fluid flow in each flow field. For this purpose, the present invention provides a fuel cell separator having an airtight gasket, which is integrally injection-molded on both surfaces of the separator to form a closed curve.