Abstract:
PURPOSE: A bipolar plate for a fuel cell stack is provided to easily seal or separate a channel flowing hydrogen, air, and cooling water by forming proper unevenness on a bipolarplate and to implement process reduction and cost saving. CONSTITUTION: A bipolar plate for a fuel cell stack enables the sealing of a flow path of a bipolar plate without a gasket by forming uneveness(102a,102b,202a,202b) capable of being inserted to each other at the edge of the bipolar plate. The unevenness of the bipolar plate gets narrow from the top and wider to the bottom, or the bipolar plate is formed in a dual unevenness structure.
Abstract:
PURPOSE: A separator for a fuel cell stack is provided to improve the efficiency of a fuel cell, to remove constant resistance of separators which are contacted with each other, and to enable mass production by manufacturing a channel part, induction part, and manifold part by a single process using a composite material. CONSTITUTION: A separator for a fuel cell stack comprises a channel part where a plurality of coolant channels(28) are penetrated thereinside and a hydrogen channel(20) and air channel(22) are formed at the position crossing one outer surface and the other surface; an induction part which is integrated at both ends of the channels and has one inside space communicated with each coolant flow path; and a manifold part which is formed at both ends of the induction part.
Abstract:
PURPOSE: A manufacturing method of prepreg is provided to solve existing various problems like graphite-residues remained in a mold, a problem not able to control a thickness of a graphite layer, etc. CONSTITUTION: A manufacturing method of prepreg comprises: a step of providing carbon long fiber-reinforced prepreg in a semi-cured sheet state which is reinforced by using a polymer resin as a base, and by a carbon material; a step of laminating a release film in which a graphite foil is coated on the prepreg; and a step of manufacturing final prepreg coated with the graphite foil by transferring the graphite foil on a surface of the prepreg through a high-temperature pressing process passing the prepreg through a hot roller(107).
Abstract:
본 발명에 의한 액화천연가스 저장탱크의 용접불량 검출방법은, 액화천연가스가 저장된 저장공간을 기밀시키기 위해 저장공간을 단열시키기 위한 단열층에 결합된 방벽의 용접 부위에서 용접불량을 검출하기 위한 것으로, a) 단열층과 방벽의 사이에 검출용 기체를 주입하는 단계와, b) 검출용 기체를 감지하여 감지신호를 발생할 수 있는 기체 감지장치를 용접 부위에 접근시켜서 용접 부위 주위의 공기 중에 누출된 검출용 기체가 존재하는지 용접 부위 주위의 공기를 감시(Monitoring)하는 단계를 포함한다. 본 발명에 의하면, 검출용 기체와 이를 감지할 수 있는 기체 감지장치를 이용함으로써 1차 방벽의 넓은 용접 부위에 대해 용접불량을 쉽고 효율적으로 검출할 수 있다.
Abstract:
PURPOSE: A separator for a polymer electrolyte membrane fuel cell is provided to lower electricity contact resistance and to reduce energy loss by smoothening water circulation through reaction by increasing a hydrophilic property of the separator surface. CONSTITUTION: A method for manufacturing a separator for a polymer electrolyte membrane fuel cell comprises the steps of: supplying prepreg(10) and graphite foil(11); cutting the prepreg and graphite foil in a longitudinal direction of the separator to be manufactured; compressing the cut prepreg and graphite foil; heating and pressurizing the prepreg in which graphite foil is laminated in one body to form hydrogen, air, and cooling water channels through high temperature press(22), or passing through a hot roll press to prepare a separator(30); cutting unnecessary parts from a heated and pressurized separator; and performing post-curing treatment of the manufactured separator.
Abstract:
PURPOSE: A joint device is provided to reduce a dead volume of an end plate and to pressurize and join the end plate through predetermined virtual pressure regardless of the length of a stack. CONSTITUTION: A fuel cell stack(100) includes: an electricity generating assembly(10) in which a plurality of unit cells(11) are consecutively arranged; end plates(30,40) which are closely arranged at both sides of the electricity generating assembly; and a joint device(200) which joins the end plates by a steel rope(111), pressurizes the electricity generating assembly by the tension of the steel rope, and enables the control of the length and tension of the steel rope.
Abstract:
개시된 본 발명에 의한 연료전지 스택용 엔드플레이트는 일렬로 적층된 복수의 단위셀을 지지하기 위한 것으로, 중앙부가 일측 방향으로 융기되도록 굽은 형상으로 이루어진다. 본 발명에 의한 엔드플레이트는 복수의 단위셀을 지지하기 위해 그 외곽부가 복수의 단위셀 쪽으로 가압될 때 복수의 단위셀에 고른 면압을 가하도록 펴진다. 따라서, 연료전지 스택 내의 수소 및/또는 공기의 누출을 방지하고, 단위셀 간의 전기 접촉저항을 감소시키는 등 연료전지 스택의 성능을 최적으로 유지시킬 수 있다.
Abstract:
PURPOSE: An end plate for a fuel cell stack is provided to ensure light weight and low heat loss, to maintain uniform plane pressure, and to prevent leakage of fluid and the increase of intercell electric contact resistance. CONSTITUTION: An end plate for a sandwich type fuel cell stack comprises a side(10) made of fiber-reinforcing composite materials and maintains a plane after tightening by applying curvature to the side. The side is manufactured by the steps of: symmetrically laminating reinforced fiber within the composite; and molding the laminate by any one method selected from vacuum bag molding, pressure molding and resin transfer molding.
Abstract:
PURPOSE: A separation plate for a polymer electrolyte membrane fuel cell and a method for manufacturing the same are provided to prepare a separation plate using a hot press or hot roll with relieve and intaglio fluid path pattern for forming hydrogen, air, and cooling water. CONSTITUTION: A method for manufacturing a separation plate for a polymer electrolyte membrane fuel cell comprises the steps of: preparing a raw material(10) of a long fiber reinforced composite in a semi-hardened state; forming the raw material in length and shape of the separation plate(30); attaching single or plural raw materials cut as the length of the separation plate by lamination; heating/pressing the laminate in a hot press(22); cutting unnecessary part from the heated and pressurized separation plate; and postcuring the separation plate.