Abstract: A fuel cell system includes an electricity generator for generating electric energy through a reaction of hydrogen and oxygen, a reformer for generating a reforming gas containing the hydrogen from a fuel through a catalytic reaction using thermal energy and for supplying the reforming gas to the electricity generator, a burner for generating the thermal energy and for supplying the thermal energy to the reformer, a fuel supply unit for supplying the fuel to the reformer, and an air supply unit for supplying air to the electricity generator. The fuel supply unit includes a main fuel tank for storing the fuel, at least one auxiliary fuel tank connected with the main fuel tank and the reformer, and a heating unit disposed in connection with the auxiliary fuel tank to heat the fuel stored in the auxiliary fuel tank.

Abstract: A reformer includes a burner that generates thermal energy, and a reforming reaction unit that is supplied with thermal energy from the burner to generate a hydrogen-rich gas from a fuel, wherein the burner includes a burner main body having first and second portions that are constructed by bending the burner main body to form bended portions and coupling the bended portions together, wherein the burner main body is disposed in an inner portion of the reforming reaction unit, and wherein a first catalyst is filled in an inner portion of the burner main body.

Abstract: A carbon monoxide remover includes a reactor body having an inner space, and a catalyst provided in the inner space of the reactor body to react with the reforming gas. A diffusion unit is installed at an inlet portion of the reactor body for introducing the reforming gas to diffuse the reforming gas over the entire area of the catalyst.

Abstract: A reformer for a fuel cell including: at least one reaction plate in which a channel is formed on a surface thereof; a cover plate disposed on the surface of the reaction plate; a bonding part which is formed between the reaction plate and the cover plate and which integrally fixes the reaction plate and the cover plate to each other; and a heat processing part which is formed outside the channel and which reduces a contact area between the reaction plate and the cover plate and controls thermal energy supplied to the reaction plate.

Abstract: A stack for a fuel cell system including at least one electricity generating unit having a membrane electrode assembly and separators respectively disposed on both surfaces of the membrane electrode assembly, wherein gaskets are interposed on edges between the membrane electrode assembly and both of the separators, and wherein sealing members are disposed between the respective gaskets and the respective separators to maintain a seal between the membrane electrode assembly and the separators.

Abstract: A fuel cell stack that includes at least one electricity generator generating electric energy through an electrochemical reaction between hydrogen and oxygen and a cooling system are provided. The electricity generator includes a membrane-electrode assembly, separators on both sides of the membrane-electrode assembly, and cooling channels placed approximately parallel to a first direction of the membrane-electrode assembly, where a coolant flows through the cooling channels, and where the cooling channels have different distribution densities in a direction perpendicular to the first direction of the membrane-electrode assembly.

Abstract: A cooling system for a fuel cell stack is provided. The fuel cell stack includes electricity generators generating electric energy through an electrochemical reaction between hydrogen and oxygen, and separators between the electricity generators. It may also contain cooling plates between the electricity generators. Cooling channels including main channels and branch channels coupling the main channels together are formed in the separators or the cooling plates. The intersection of the main and branch cooling channels forms grid-shaped areas with pillars in between that are rectangular, triangular, circular, shaped like a parallelogram, or formed in a combination of these shapes. The cooling channels increase the contact area between the coolant and the separators or the cooling plates and therefore the cooling efficiency of a stack.