Abstract: The present invention relates to a fuel cell stack, and according to one aspect of the present invention, there is provided a fuel cell stack comprising a plurality of fuel cells, wherein the fuel cell comprises a membrane-electrode assembly having an anode electrode and a cathode electrode, gas diffusion layers each disposed on both sides of the membrane-electrode assembly, a first separating plate having a first surface facing the anode electrode side so as to be in contact with the gas diffusion layer and a second surface opposite to the first surface, and a second separating plate having a first surface facing the cathode electrode side so as to be in contact with the gas diffusion layer and a second surface opposite to the first surface, and at least one of the second surface of the first separating plate and the second surface of the second separating plate is provided with one or more protrusions protruding to the outside.

Abstract: A compact antenna apparatus for a mobile communication system includes: a radome having at least one frequency band radiating element provided therein; at least one phase shifter portion which is provided in an inner side of the radome and which is connected to the radiating element to adjust a tilting angle of the radiating element; and a rotary knob portion which is provided so as to be exposed to the outside of the radome and which is directly coupled to the phase shifter portion to drive a phase shifter.

Abstract: A separator and a fuel cell stack, the separator including a plurality of convex portions and a plurality of concave portions which are sequentially provided along a first direction, the convex portions having first openings on top surfaces at predetermined intervals along a second direction orthogonal to the first direction and the first openings of two adjacent convex portions are each provided so as not to be positioned coaxially based on a virtual first line parallel to the first direction.

Abstract: The present invention relates to an apparatus and a method for manufacturing a channel plate, and according to one aspect of the present invention, there is provided an apparatus for manufacturing a channel plate, which is a manufacturing apparatus for forming a channel for transferring a substance to a plate, comprising a slitting unit provided to have a predetermined pattern for forming a plurality of openings on the plate in a transport process of the plate and a pressing unit provided to form a channel on the plate by pressurizing the opening region of the plate passing through the punching unit to bend it in a predetermined angle and direction.

Abstract: The present invention relates to a separator and a fuel cell stack comprising the same, and according to one aspect of the present invention, there is provided a separator comprising: a plurality of riblet elements arranged to be spaced apart at a predetermined interval; and a plurality of connecting bars connecting two adjacent riblet elements, wherein each of the riblet elements comprises a contact portion having a predetermined area, and a first partition wall and a second partition wall each extended from both sides of the contact portion, the space formed by the first partition wall, the contact portion and the second partition wall is opened along the connection direction of the connecting bar, and at least two riblet elements are provided such that each of the contact portions has a different area.

Abstract: The present invention relates to a separation plate, a manufacturing method therefor, and a fuel cell stack comprising the same, and according to one aspect of the present invention, provided is a separation plate having: a first surface and a second surface in a direction opposite to that of the first surface; a plurality of channel elements protruding from the second surface toward the first surface, wherein each of the channel elements is arranged to have an inlet port and an outlet port along the flowing direction of a fluid flowing on the first surface; and a rib having a height varying along the circumferential direction of a virtual axis connecting the inlet port and the outlet port, wherein at least a partial region of an outer surface of the rib is formed into a cycloid curved surface along the circumferential direction of the virtual axis.

Abstract: The present invention relates to a separating plate and a fuel cell stack including same. According to an embodiment of the present invention, a separating plate is provided defining a coolant passage capable of uniform coolant supply and heat recovery across all areas of a reaction region, the separating plate can easily regulate the temperature of a reaction surface, and a reduction in performance and durability due to thermal load can be prevented.

Abstract: The present invention relates to a separating plate, a method for manufacturing the same, and a fuel cell stack comprising the same. An aspect of the present invention provides a separating plate comprising: a plurality of channels extending in elongated shapes along a first direction, respectively; and a plurality of riblet elements provided to connect side walls of two adjacent channels along a second direction, which is perpendicular to the first direction, wherein the plurality of riblet elements, which connect side walls of two adjacent channels, are spaced by a predetermined interval along the first direction, and a separating plate, which is provided with a first opening, is provided between two riblet elements, which are adjacent to each other along the first direction.

Abstract: A compact antenna apparatus for a mobile communication system includes: a radome having at least one frequency band radiating element provided therein; at least one phase shifter portion which is provided in an inner side of the radome and which is connected to the radiating element to adjust a tilting angle of the radiating element; and a rotary knob portion which is provided so as to be exposed to the outside of the radome and which is directly coupled to the phase shifter portion to drive a phase shifter.

Abstract: A terminal and a call providing method may be provided in which a calling terminal transmits both a video call and a voice call to a called terminal. A controller may generate a message for transmitting both a video call and a voice call to a selected contact information and a wireless communication unit may transmit the message generated by the controller to a called terminal that matches the selected contact information.

Abstract: The present invention provides a fuel cell bipolar plate and a method for manufacturing the same, in which a carbon or metal fuel cell bipolar plate is surface-treated with a complex transition metal oxide, which is a main component of a variable resistance heating element having a negative temperature characteristic, so that the bipolar plate can ensure a sufficient amount of heat, required to prevent product water from freezing, by itself in a short time without any external energy, thus improving cold start performance of a fuel cell vehicle at a temperature below zero.

Abstract: A terminal and a call providing method may be provided in which a calling terminal transmits both a video call and a voice call to a called terminal. A controller may generate a message for transmitting both a video call and a voice call to a selected contact information and a wireless communication unit may transmit the message generated by the controller to a called terminal that matches the selected contact information.

Abstract: The present invention provides a fuel cell bipolar plate and a method for manufacturing the same, in which a carbon or metal fuel cell bipolar plate is surface-treated with a complex transition metal oxide, which is a main component of a variable resistance heating element having a negative temperature characteristic, so that the bipolar plate can ensure a sufficient amount of heat, required to prevent product water from freezing, by itself in a short time without any external energy, thus improving cold start performance of a fuel cell vehicle at a temperature below zero.

Abstract: The present invention relates to a method of manufacturing a proton-conducting reinforced composite membrane, and more particularly, to a reinforced composite membrane which is manufactured by introducing an additive into a sulfonated hydrocarbon-based polymer as a proton-conducting material, and impregnating the additive-introduced polymer into a porous polymer having excellent dimensional stability.