Abstract: The present invention provides a novel integrated valve system for a fuel cell stack, in which an air shut-off valve for preventing the inflow of air when a fuel cell shuts down and a dry gas purge valve for improving cold startability are coaxially coupled to each other so that the air shut-off valve and the dry gas purge valve simultaneously open or close.

Abstract: A clamping device includes an oblique device and a unidirectional load control plate disposed on the outside of the fuel cell stack, not on the inside of the fuel cell stack. The device can automatically compensating the surface pressure in the fuel cell stack to be maintained constant, and provide a large clamping load with a small force using the load of the fuel cell stack.

Abstract: The method of activating a vehicle fuel cell for ensuring maximum performance, improves performance of a polymer electrolyte membrane fuel cell, reduces a hydrogen usage, and has stable performance after manufactured. The method includes: placing a fuel cell in an activation device so as to be activated; changing a humidification state of a humidifier which supplies vapor to the fuel cell and a state of a cooling water; supplying a reactant gas to the fuel cell and maintaining a no-load state; maintaining a load state while changing a flow rate of the vapor and gas supplied to the fuel cell; changing the sate of the fuel cell to the no-load state, and re-supplying the reactant gas to the fuel cell; and comparing data measured when the fuel cell operates in the no-load state and data measured when the fuel cell operates in the load state respectively with a reference value.

Abstract: A system for activating a fuel cell includes a flow meter for measuring the amount of water discharged from an outlet of the air electrode and an outlet of the fuel electrode; a pressure sensor for measuring the pressure at the respective outlets; and a back pressure regulator receiving flow values measured by the flow meters and pressure values measured by the pressure sensors, which are fed back from a controller, and regulating a pressure difference (?P=PCathode?PAnode) to be a value greater than 0. With the system, the activation time of a fuel cell and the amount of hydrogen used for the activation can be reduced, thus improving the productivity and manufacturing cost.

Abstract: The present invention provides a method of forming a nanostructured surface (NSS) on a polymer electrolyte membrane (PEM) of a membrane electrode assembly (MEA) for a fuel cell, in which a nanostructured surface is suitably formed on a polymer electrolyte membrane by plasma treatment by plasma-assisted chemical vapor deposition (PACVD), where catalyst particles or a catalyst layer are directly deposited on the surface of the polymer electrolyte membrane having the nanostructured surface.

Abstract: The present invention provides an apparatus and method for manufacturing a metal separator for a fuel cell, which can manufacture large-sized metal separators in large quantities using metal plates such as stainless steel by thermoplastic deformation using an incremental and synchronized rubber molding process.

Abstract: The present invention provides an apparatus and method for determining deterioration of a fuel cell, the method including measuring in real time fluoride ion concentration or pH value of outflow water from a fuel cell stack during operation in a fuel cell vehicle, calculating a fluoride emission rate from the measured value and, if the calculated fluoride emission rate is out of a predetermined normal range, determining deterioration of an electrolyte membrane of the fuel cell stack.

Abstract: The present invention provides a method for bonding a membrane electrode assembly (MEA) and a gas diffusion layer (GDL) of a fuel cell stack, which facilitates stacking of an electrode catalyst layer of the MEA and the GDL and, at the same time, facilitates the keeping of the stacked layers for mass production of the fuel cell stack. For this purpose, the present invention provides a method for bonding a membrane electrode assembly and a gas diffusion layer of a fuel cell stack, the method including: coating a catalyst layer on a surface of a polymer electrolyte membrane; attaching a sub-gasket on the circumference of the polymer electrolyte membrane; and stacking a gas diffusion layer onto an outer surface of the catalyst layer by bonding all or a portion of an outer surface of the sub-gasket and the circumference of the gas diffusion layer with a bonding means.

Abstract: The present invention provides a separating plate for a fuel cell stack and method of manufacturing the same, and more particularly, to a separating plate for a fuel cell stack and method of manufacturing the same, in which the separating plate constituting the fuel cell stack is formed in such a fashion as to interpose an array of metal pipes between two sheets of composite material, and a gasket abutting against the separating plate is formed in such a fashion as to define hydrogen and air flow channels, thereby removing a contact resistance between two adjoining separating plates constituting unit cells to improve the efficiency of the fuel cell.

Abstract: The present invention provides an end plate for fuel cell stack and a method for manufacturing an end plate, which can increase flexural rigidity per weight, and improve strain at break, and reduce heat transmission by applying hybrid core element having honeycomb and form structures to an end plate having sandwich structure combined to both end portions of a fuel cell stack.

Abstract: The present invention provides a fuel cell separator formed of a continuous carbon-fiber composite, and a method for manufacturing the same.

Abstract: The present invention provides a device and method for recovering a catalyst for a fuel cell, in which a carbon nanotube filter is provided in an air circulation loop of the fuel cell to recover catalyst particles washed away from a catalyst layer of an air electrode during operation of the fuel cell.

Abstract: A clamping device includes an oblique device and a unidirectional load control plate disposed on the outside of the fuel cell stack, not on the inside of the fuel cell stack. The device can automatically compensating the surface pressure in the fuel cell stack to be maintained constant, and provide a large clamping load with a small force using the load of the fuel cell stack.

Abstract: The present invention provides a method of assembling a fuel cell stack, in which a fixing block and a fixing pin are used to assemble the fuel cell stack instead of a bolt, thereby reducing the time and process required for assembly of the fuel cell stack, enabling an assembly process using an automated device to be realized, and facilitating mass production.

Abstract: Disclosed is a structure for improving a laminating efficiency of a metal-separator for a fuel cell stack, the metal-separator comprising an embossed structure that has an indentation and a projection alternately formed along at least one edge thereof so as to enable a plurality of the metal-separators to be stably laminated in a honeycomb shape.

Abstract: The present invention provides a gasket for reducing stress concentration in a fuel cell stack, which prevents damage or deformation of a separator and further prevents a position shift of the gasket by reducing stress concentration formed at a specific region by deformation of the gasket due to a compression force. Accordingly, the present invention provides a gasket including a T-shaped or cross-shaped gasket joint to form hydrogen, air and coolant manifolds, and the gasket joint has a structure in which two joint branches forming an angle of 180° in the opposite direction to each other are joined at one point with a particular angles so as to reduce stress concentration formed due to compression force by deformation of the gasket.

Abstract: The present invention provides a metal separator for a fuel cell, which is formed by stamping molding a first metal thin plate and a second metal thin plate, the metal separator comprising: at least one cooling flow field enclosed by inner surfaces of the first and second metal thin plates; first and second main flow fields enclosed by outer surfaces of the first and second thin plates, respectively; and first and second auxiliary flow fields formed on a top surface of the first main flow field and a bottom surface of the second main flow field, respectively.

Abstract: The present invention provides a ventilation apparatus for a fuel cell vehicle, which can rapidly remove high-temperature air generated in the inside of a stack case by moving the same to an air cleaner using a suction pressure of air supplied for the operation of the fuel cell vehicle, reduce the risk incurred due to hydrogen leakage by moving leaking hydrogen to the air cleaner, and maintain the temperature of a fuel cell stack constant.

Abstract: The present invention provides an intelligent MEA for fuel cell including means for easily measuring the voltage of unit cells and means for preventing heat transfer from an outside low-temperature heat source to a catalyst layer of the MEA during operation of the fuel cell stack at low temperature.

Abstract: The present invention relates to a gasket structure for use in a fuel cell having a separator which defines at each of the both ends thereof a hydrogen manifold, an air manifold, an antifreezing solution manifold between the hydrogen manifold and the air manifold, the structure comprising a plurality of gasket parts a portion of which is open toward the outside of the separator so as to prevent antifreezing solution leaked from the antifreezing solution manifold from flowing into the hydrogen manifold and the air manifold.