Abstract: An apparatus for preventing deformation of a fuel cell stack is provided. The apparatus includes a support unit, respective ends of which are connected to first endplates of a pair of stacked fuel cell stacks. The apparatus further includes a support protrusion that protrudes from a surface of the support unit and extends through a gap between the pair of fuel cell stacks.

Abstract: Disclosed is a manifold block for a fuel cell, which provides excellent electrical insulation for a coolant flow channel in an internal flow channel. More specifically, a manifold block for a fuel cell stack, includes a coolant interface formed of a polymer insulating material and coolant flow channels; and a reactant gas interface formed of a metal material and including reactant gas flow channels. In particular, the reactant and coolant interfaces are mounted to a stack module and, at the same time, are integrally bonded to each other.

Abstract: A fuel cell stack is provided that includes a fuel cell stack module and an enclosure. The fuel cell stack module includes end plates and coupling bars coupled to the end plates. The enclosure includes an upper enclosure covering a front surface, an upper surface, and a back surface of the fuel cell stack module, a lower enclosure covering the front surface, a lower surface, and the back surface of the fuel stack module, a left enclosure fixed to one of the end plates, and a right enclosure fixed to the other of the end plates. The upper enclosure and the lower enclosure are coupled to protruding portions of the left enclosure and the right enclosure and bent toward the surfaces of the fuel cell stack module so as to be in surface contact with the surfaces of the fuel cell stack module.

Abstract: An apparatus for preventing moisture condensation includes a fuel cell stack and an enclosure in which the fuel cell stack is disposed. A heater and a temperature sensor are provided in the enclosure. A controller is configured to control the heater to be turned on when an insulation resistance between the fuel cell stack and the enclosure is less than a preset resistance value. The controller controls the heater not to be turned on when a surface temperature of the enclosure measured by the temperature sensor exceeds a preset temperature.

Abstract: An air processing system of a fuel cell vehicle mounted with an integrated valve includes: the integrated valve attached to an air inlet and an air outlet formed integrally with a fuel cell stack and adjusting amounts of air introduced into and discharged from the fuel cell stack. The integrated valve is positioned at the shortest distance from the fuel cell stack, such that an amount of remaining oxygen that is to be consumed at the time of stopping start of a fuel cell vehicle is minimized. Therefore, corrosion of cathode carbon is decreased as compared with the related art, such that durability of the fuel cell vehicle is improved.

Abstract: A manifold block assembly for a fuel cell vehicle mounted on a fuel cell stack and supplying air and hydrogen to the stack, includes a manifold block in which a hydrogen discharge path connected to a hydrogen line formed in the stack, an air discharge path connected to an air line formed in the stack, and a watertight bulkhead are integrally formed with each other. The manifold block assembly further includes a hydrogen inflow pipe configured to be attached to the manifold block and connected to the hydrogen line formed in the stack. The manifold block assembly also includes an air inflow pipe configured to be attached to the manifold block and connected to the air line formed in the stack.

Abstract: The present invention provides a manifold block for a fuel cell stack, coupled to a fuel cell stack module and having a gas passage and a cooling water passage. The manifold block includes an insulating member and an insulating cover. The insulating member is inserted into the cooling water passage and contacts an inner surface of the cooling water passage. The insulating member has a tube-like shape and electrically insulates the inner surface of the cooling water passage. The insulating cover is inserted into the cooling water passage and contacts an inner surface of the insulating member. The insulating cover fixes and protects the insulating member.

Abstract: A ventilation apparatus includes: a controller that determines whether insulation resistance between a fuel cell stack and an enclosure including the fuel cell stack is equal to or smaller than a preset value, and varies a degree of opening of a valve provided between an inlet provided on one side of the enclosure and an air blower injecting air to an interior of the enclosure through the inlet based on the determination.

Abstract: Disclosed herein is a fuel cell stack. The fuel cell stack includes: at least one unit stack comprising an assembly of unit cells and an enclosure protecting the unit stack. In particular, reaction gas inlet/outlet channels for supplying reaction gas to the unit stack are formed on a first side surface of the enclosure, and coolant inlet/outlet channels for supplying coolant to the unit stack are formed on a second side surface of the enclosure.

Abstract: An apparatus for preventing a bolt release includes: a nut hole formed in a body; and an insulating part formed integrally with a bolt coupled to the nut hole and contacting the body, where a plurality of protruded slopes are formed along a circumference of a bonding surface among a plurality of bonding surfaces between the body and the insulating part according to a relative magnitude of hardness or friction coefficient between the body and the insulating part when the bolt is coupled.

Abstract: An end plate for a fuel cell is provided in which a main block is configured to form a body and support a fuel cell at a predetermined pressure and a subplate is configured to include a material having reducibility higher than that of the main block and to adhere to one side of the main block. Additionally, an insulating part encloses the main block and the subplate.

Abstract: A method for manufacturing a manifold for a fuel cell with a multilayer structure by injection-molding individual manifolds, each having welding projections and welding guides, and bonding the injection-molded individual manifolds by vibration welding includes arranging welding projections of an upper individual manifold and welding guides of a lower individual manifold to be engaged with each other while maintaining a uniform gap between each other to bond a plurality of individual manifolds in an up and down stacking structure, pressing the lower individual manifold upward, and applying vibration to the upper individual manifold in the left and right direction, thus bonding the upper and lower individual manifolds. Among the welding projections of the upper individual manifold, a non-horizontal welding projection whose longitudinal direction does not coincide with the vibration direction of the individual manifold has a variable height.

Abstract: A fuel cell stack manifold having an ejector function of which the manufacturing cost and the weight can be reduced by optimizing hydrogen supply and recirculation channels and removing other members. hardware without a separate ejector structure for additionally attaching an ejector, of which the productivity can be improved by removing from an ejector assembly process. The fuel cell system minimizes joints through which hydrogen may leak, by implementing a new structure of a manifold added with an ejector function by integrally forming/manufacturing a stack manifold having a venturi and diffuser structure and adding a nozzle thereto.

Abstract: A fuel cell stack enclosure is provided that includes side covers configured to be joined with each of end of a stack module respectively. A lower cover is also configured to be provided under the stack module and formed to partially cover a lower portion and a first side portion of an outer surface of the side cove. An upper cover may be provided over the stack module, and be formed to partially cover an upper portion and a second side portion of the outer surface of the side cover to enclose the stack module along with the lower cover while joining with the side covers.

Abstract: A fuel cell stack is provided that includes a fuel cell stack module and an enclosure. The fuel cell stack module includes end plates and coupling bars coupled to the end plates. The enclosure includes an upper enclosure covering a front surface, an upper surface, and a back surface of the fuel cell stack module, a lower enclosure covering the front surface, a lower surface, and the back surface of the fuel stack module, a left enclosure fixed to one of the end plates, and a right enclosure fixed to the other of the end plates. The upper enclosure and the lower enclosure are coupled to protruding portions of the left enclosure and the right enclosure and bent toward the surfaces of the fuel cell stack module so as to be in surface contact with the surfaces of the fuel cell stack module.

Abstract: A fuel cell for a vehicle includes seats disposed on a side of a separation plate and having a recessed bottom and inclined sides connecting the edges of the bottom and the separation plate at an angle. Gaskets are projected along the seats on the side of the separation plate. Fastening bars are seated in the seats with the gaskets projected thereon, in the shape of a strip fastening the fuel cell and have a body being in close contact with the bottom and flanges being in close contact with an inclined side.

Abstract: A technique is described herein for monitoring the operational state of a fuel cell stack by the detection of nonlinearity in such a manner that an external test signal for frequency response is generated and applied to the fuel cell stack during operation, the resulting signal output from the fuel cell stack is measured, and the harmonic content of the measured signal is analyzed, the method including: applying a multiple frequency test signal comprising at least two sinusoidal waves as the test signal for frequency response to the fuel cell stack; and analyzing the resulting current or voltage signal output from the fuel cell stack.

Abstract: Disclosed is an apparatus and method for forming an oxidation layer on a manifold block for a fuel cell stack, which forms an oxidation layer uniformly over the entire surface of a long and complicated internal flow field of a manifold block. In particular, the apparatus for forming an oxidation layer on a manifold block for a fuel cell stack includes: an electrolyte bath which contains an electrolyte required for the formation of the oxidation layer, an electrode for supplying a required electron flow for the formation of the oxidation layer from a power supply to the manifold block immersed in the electrolyte of the electrolyte bath and to the electrolyte, and an air supply for supplying oxygen to the electrolyte. Even more particularly, the electrode connected to the electrolyte is inserted into each internal flow field of the manifold block to provide an effective electron flow therein.

Abstract: The present invention features a fuel cell stack that preferably includes an electricity generating assembly having a plurality of unit cells that are suitably disposed one after another; a pair of end plates pressedly disposed respectively at upper and lower ends of the electricity generating assembly; and a joining device suitably engaging the end plates by a rope, where pressure is applied to the electricity generating assembly by means of tension of the rope, and the length and tension of the rope is suitably controlled.

Abstract: A method for manufacturing a manifold for a fuel cell with a multilayer structure by injection-molding individual manifolds, each having welding projections and welding guides, and bonding the injection-molded individual manifolds by vibration welding includes arranging welding projections of an upper individual manifold and welding guides of a lower individual manifold to be engaged with each other while maintaining a uniform gap between each other to bond a plurality of individual manifolds in an up and down stacking structure, pressing the lower individual manifold upward, and applying vibration to the upper individual manifold in the left and right direction, thus bonding the upper and lower individual manifolds. Among the welding projections of the upper individual manifold, a non-horizontal welding projection whose longitudinal direction does not coincide with the vibration direction of the individual manifold has a variable height.