Abstract: A structure of a fuel cell system and a controlling method thereof are provided. The structure of the fuel cell system includes a flow sensor that is configured to detect a flow of air introduced into the fuel cell system and an air compressor that is configured to compress the introduced air and has an air foil bearing to maintain minimum driving revolutions per minute or greater. Additionally, the system includes a flow adjuster that is connected to the fuel cell system. Accordingly, since an amount of air corresponding to a required amount of air of the fuel cell system is supplied by limiting or recirculating an excessive air supply while securing durability and durability of abrasion of the air compressor to which the air foil bearing is applied, a dry phenomenon of the fuel cell system including a stack due to the excessive supply of air is prevented.

Abstract: Disclosed is a method and device for producing a membrane module used in a membrane humidifier for humidifying air in a polymer fuel cell, in which a small amount of hollow fiber membranes are disposed in the center of the membrane module and a larger amount of hollow fiber membranes are disposed toward the edge based on the design of a potting cap. Dry air introduced from an air blower into the membrane can be distributed to the edge where the larger amount of hollow fiber membranes are disposed, thereby maintaining uniform humidification performance over the entire hollow fiber membranes.

Abstract: A humidification apparatus for a fuel cell system is provided herein. A membrane humidifier includes humid air inlets, through which humid air discharged from a cathode of a fuel cell stack is introduced, and air outlets, through which air humidifying dry air in hollow fiber membranes is discharged, an air line connected from a cathode outlet of the fuel cell stack to the humid air inlets of the membrane humidifier to supply humid air. Exhaust lines are connected to the air outlets. A flow control valve is provided in the air line and controls the introduction of humid air into the humid air inlets, respectively. An exhaust valve is also provided to open and close flow paths of the exhaust lines. A controller controls the opening and closing of the flow control valve and the exhaust valve based on operating conditions of the fuel cell stack.

Abstract: Disclosed is a device for adjusting humidification gas of a membrane humidification device of a fuel cell. In particular, the device is adapted to induce changes in differential pressure and velocity of the wet air for each division module and to improve the humidification efficiency by sequentially mounting the division modules divided into various numbers to the interior of a housing of the membrane humidification device, thereby adjusting the density of the hollow fiber membrane filled in each division module.

Abstract: A humidification apparatus for a fuel cell system is provided herein. A membrane humidifier includes humid air inlets, through which humid air discharged from a cathode of a fuel cell stack is introduced, and air outlets, through which air humidifying dry air in hollow fiber membranes is discharged, an air line connected from a cathode outlet of the fuel cell stack to the humid air inlets of the membrane humidifier to supply humid air. Exhaust lines are connected to the air outlets. A flow control valve is provided in the air line and controls the introduction of humid air into the humid air inlets, respectively. An exhaust valve is also provided to open and close flow paths of the exhaust lines. A controller controls the opening and closing of the flow control valve and the exhaust valve based on operating conditions of the fuel cell stack.

Abstract: A humidifier for a fuel cell system is provided to improve humidification efficiency of a hollow fiber improving a gas flow inside a membrane module into which tube side air and moist air are introduced. The humidifier includes a membrane module in which hollow fibers are fixed inside a case in a bundle form and a first manifold and a second manifold each assembled at both ends of the case. An inside of the membrane module includes a tube side air supply tube which forms a gas flow in the same direction as the hollow fiber and one side of the tube side air supply tube includes at least one moist air pumping part configured to suction moist air flowing in an exterior of the tube side air supply tube by a flow velocity and a flow pressure of tube side air.

Abstract: Provided are air humidification device and method for a fuel cell. The air humidification device and method for the fuel cell may cool an air compressor and air compressed by the air compressor and easily humidify air supplied to the fuel cell by mixing water with air and injecting the mixture into an inlet of the air compressor. In particular, the air humidification device and method may easily humidify air supplied to a cathode of the fuel cell by bypassing a portion of the compressed air from an outlet of an air compressor supplying air to the cathode of the fuel cell and simultaneously by injecting condensed water discharged from a fuel cell system into an inlet of the air compressor using the bypassed compressed air.

Abstract: A membrane humidifier is provided for a fuel cell. The membrane humidifier of the present invention includes a hollow housing, a joint member, a plurality of internal partition modules, and a plurality of hollow fiber membrane bundles. The hollow housing has a humid air inlet formed at one end thereof and a humid air outlet formed at the other end thereof. The joint member is formed integrally with an inner circumferential surface of the hollow housing. The plurality of internal partition modules are coupled to the joint member and arranged adjacent to each other in the hollow housing, and have a plurality of humid air guiding apertures passing therethrough. The plurality of hollow fiber membrane bundles are disposed in the plurality of internal partition modules, respectively.

Abstract: Disclosed is a membrane humidifier for a fuel cell, which uniformly humidifies entire hollow fiber membranes from an outer side to a central portion of an interior of the membrane humidifier to improve the distribution of wet air and dry air, thereby improving a humidification performance. The membrane humidifier for the fuel cell includes a hollow upper case including first wet air inlet apertures and first wet air outlet apertures and a membrane module assembly including a plurality of unit membrane modules received lengthwise within the upper case along the flow direction of dry air.

Abstract: An apparatus that efficiently supplies air to a fuel cell within a vehicle. In particular, a compressor compresses air and supplies a first portion of the compressed air to an evaporator and a second portion to a heat exchanger. A drain valve also discharges condensate water from a fuel cell to the evaporator so that the evaporator receives some of both the compressed air and the condensate water and supplies air humidified by evaporation of the condensate water directly to the fuel cell. A heat exchanger also receives some of the compressed air, transfers heat from the received compressed air to the evaporator, and discharges cooled air to a humidifier. The humidifier receives and humidifies the cooled air and supplies the humidified air to the fuel cell.

Abstract: Acrylic fine particles formed by polymerization of a (meth)acrylate containing monomer with a cross-linking agent are disclosed. The cross-linking agent includes a first cross-linking agent having at least three (meth)acryloyloxy groups and at least one functional group —OH, —COOH, or a combination thereof, and the acrylic fine particles can have a coefficient of variation (C.V.) of about 20 to about 60%. The acrylic fine particles can have high heat resistance and solvent resistance and also enhanced compatibility with a binder and a solvent. Accordingly, the acrylic fine particles can exhibit remarkably increased dispersibility when used in a diffusing film or the like, and thus are suitable for use as a diffusing agent.

Abstract: Disclosed is a humidifier for a fuel cell system including a separator plate which is corrugated to provide an alternating concave-convex surface, and humidifying films provided at an upper end and a lower end of the separator plate, respectively. More specifically, the separator plate and the humidifying films form a series of drift spaces in which a width of an upper end portion is different from a width of a lower end portion which is contact with the humidifying film.

Abstract: A humidification apparatus for a fuel cell system is provided herein. A membrane humidifier includes humid air inlets, through which humid air discharged from a cathode of a fuel cell stack is introduced, and air outlets, through which air humidifying dry air in hollow fiber membranes is discharged, an air line connected from a cathode outlet of the fuel cell stack to the humid air inlets of the membrane humidifier to supply humid air. Exhaust lines are connected to the air outlets. A flow control valve is provided in the air line and controls the introduction of humid air into the humid air inlets, respectively. An exhaust valve is also provided to open and close flow paths of the exhaust lines. A controller controls the opening and closing of the flow control valve and the exhaust valve based on operating conditions of the fuel cell stack.

Abstract: An apparatus that efficiently supplies air to a fuel cell within a vehicle. In particular, a compressor compresses air and supplies a first portion of the compressed air to an evaporator and a second portion to a heat exchanger. A drain valve also discharges condensate water from a fuel cell to the evaporator so that the evaporator receives some of both the compressed air and the condensate water and supplies air humidified by evaporation of the condensate water directly to the fuel cell. A heat exchanger also receives some of the compressed air, transfers heat from the received compressed air to the evaporator, and discharges cooled air to a humidifier. The humidifier receives and humidifies the cooled air and supplies the humidified air to the fuel cell.

Abstract: Disclosed is a method and device for producing a membrane module used in a membrane humidifier for humidifying air in a polymer fuel cell, in which a small amount of hollow fiber membranes are disposed in the center of the membrane module and a larger amount of hollow fiber membranes are disposed toward the edge based on the design of a potting cap. Dry air introduced from an air blower into the membrane can be distributed to the edge where the larger amount of hollow fiber membranes are disposed, thereby maintaining uniform humidification performance over the entire hollow fiber membranes.

Abstract: Disclosed is a membrane humidifier for a fuel cell, which uniformly humidifies entire hollow fiber membranes from an outer side to a central portion of an interior of the membrane humidifier to improve the distribution of wet air and dry air, thereby improving a humidification performance. The membrane humidifier for the fuel cell includes a hollow upper case including first wet air inlet apertures and first wet air outlet apertures and a membrane module assembly including a plurality of unit membrane modules received lengthwise within the upper case along the flow direction of dry air.

Abstract: The present invention provides a humidifier for a fuel cell, in which a plurality of hollow fiber membranes having different diameters are appropriately arranged to control the flow direction of dry air introduced into the humidifier, thus uniformly humidifying the dry air.

Abstract: A membrane humidifier is provided for a fuel cell. The membrane humidifier of the present invention includes a hollow housing, a joint member, a plurality of internal partition modules, and a plurality of hollow fiber membrane bundles. The hollow housing has a humid air inlet formed at one end thereof and a humid air outlet formed at the other end thereof. The joint member is formed integrally with an inner circumferential surface of the hollow housing. The plurality of internal partition modules are coupled to the joint member and arranged adjacent to each other in the hollow housing, and have a plurality of humid air guiding apertures passing therethrough. The plurality of hollow fiber membrane bundles are disposed in the plurality of internal partition modules, respectively.

Abstract: Acrylic fine particles formed by polymerization of a (meth)acrylate containing monomer with a cross-linking agent are disclosed. The cross-linking agent includes a first cross-linking agent having at least three (meth)acryloyloxy groups and at least one functional group —OH, —COOH, or a combination thereof, and the acrylic fine particles can have a coefficient of variation (C.V.) of about 20 to about 60%. The acrylic fine particles can have high heat resistance and solvent resistance and also enhanced compatibility with a binder and a solvent. Accordingly, the acrylic fine particles can exhibit remarkably increased dispersibility when used in a diffusing film or the like, and thus are suitable for use as a diffusing agent.

Abstract: The present invention provides a humidifier for a fuel cell, in which a plurality of hollow fiber membranes having different diameters are appropriately arranged to control the flow direction of dry air introduced into the humidifier, thus uniformly humidifying the dry air.