Abstract: The gas liquid separator comprises a gas liquid separator-forming portion formed in an end plate of a fuel cell to have an opening at an end face of the end plate and that constitutes part of the gas liquid separator; and a cover member located to cover the opening and is combined with the gas liquid separator-forming portion to constitute the gas liquid separator. The gas liquid separator-forming portion includes a first inner wall portion provided to serve as a flow path of the off-gas and form part of a reservoir and that is configured to include an off-gas outlet, to be connected with the opening and to be formed concave in a thickness direction of the end plate; and a surrounding portion protruded from the first inner wall portion along a first direction from the gas liquid separator-forming portion toward the cover member to surround the off-gas outlet.

Abstract: A fuel cell system, includes: a fuel cell stack that is formed by stacking fuel cells for causing electrochemical reaction of a fuel gas and an oxidizing gas; a fuel gas supply system that is configured to supply the fuel gas to the fuel cell stack from a supply source of the fuel gas; a fuel gas recirculating system that is configured to resupply to the fuel cell stack the fuel gas discharged from the fuel cell stack; and a piping member is configured to connect a junction between the fuel gas supply system and the fuel gas recirculating system with the supply source, the piping member having a bent portion that is curved such that a supply direction of the fuel gas from the supply source is reverse to a flowing direction of the fuel gas toward the junction.

Abstract: A gas-liquid separator includes a gas-liquid separator forming portion that is provided in an end plate, and a cover member. The gas-liquid separator forming portion includes a first inner wall portion that serves as a flow path for an off-gas and forms a part of an accumulating portion, the first inner wall portion having a shape recessed in a thickness direction of the end plate. The cover member includes a second inner wall portion that has a shape recessed in a thickness direction of the cover member, the second inner wall portion being disposed to face the first inner wall portion in a stack direction and forming the accumulating portion together with the first inner wall portion.

Abstract: To reduce a manufacturing cost on anodization in an aluminum-type fuel cell case, a method of manufacturing a fuel cell case made of one of aluminum and aluminum alloy and for accommodating a fuel cell is provided, which includes forming, in a fuel cell case, through-holes for receiving pins when the fuel cell case is mounted on a vehicle, and forming alumite on a surface of the fuel cell case by anodizing the surface using the through-hole as a contact.

Abstract: A fuel cell system to be mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle. Cooling water is supplied from a cooling water inlet of a stack manifold, flows through a fuel cell stack, and returns to the stack manifold. A groove is formed on the rear surface side of the stack manifold, constituting, together with a terminal, a cooling water channel. The cooling water flows through the cooling water channel, and is discharged to the outside from a cooling water outlet. The cooling water channel is formed extending from the rear side to the front side of the vehicle, and warms an end plate. A pipe length of the cooling water channel to a radiator mounted in a front part of the vehicle is reduced.

Abstract: A fuel cell system includes a fuel cell stack that generates electricity by an electrochemical reaction using a fuel gas; an insulating first passage member through which produced water that is produced by the electrochemical reaction in the fuel cell stack and off-gas that is discharged from the fuel cell stack pass; a conductive second passage member that is connected to the first passage member; and a produced water flow disrupting portion that is provided on the first passage member and breaks up or stops the flow of the produced water that is introduced from an inside wall of the first passage member to the second passage member.

Abstract: A fuel cell system according to the present invention comprises a fuel gas supply system that supplies a fuel gas from a fuel supply source to a fuel cell that includes a stack including a plurality of cells, and a fuel off-gas circulation system that resupplies fuel off-gas to the stack. The fuel off-gas circulation system includes: a mixed fuel gas flow path formed such that a mixed fuel gas containing the fuel off-gas and the fuel gas flows in a direction along an inner surface of a manifold installed in the stack; and a point of merger where the fuel off-gas and the fuel gas merge with each other to produce the mixed fuel gas, the point of merger being arranged on one surface side of the manifold. With such configuration, the heat exchange efficiency of the fuel off-gas and the fuel gas can be increased, and ice resulting from water in the fuel off-gas can be prevented from flowing into the fuel cell stack.

Abstract: A fuel cell system includes a fuel cell; a circulating system that circulates and supplies fuel off-gas discharged from the fuel cell to the fuel cell; a pump that pumps a fluid in the circulating system; a discharge valve through which the fluid in the circulating system is discharged to the outside; and a control device that controls the pump and the discharge valve. If operation of the fuel cell is started in a cold environment, the control device executes a control to start power generation in the fuel cell for a first period before activating the pump and executes a control to drive the pump while the discharge valve is closed for a second period.

Abstract: A fuel cell system to be mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle. Cooling water is supplied from a cooling water inlet of a stack manifold, flows through a fuel cell stack, and returns to the stack manifold. A groove is formed on the rear surface side of the stack manifold, constituting, together with a terminal, a cooling water channel. The cooling water flows through the cooling water channel, and is discharged to the outside from a cooling water outlet. The cooling water channel is formed extending from the rear side to the front side of the vehicle, and warms an end plate. A pipe length of the cooling water channel to a radiator mounted in a front part of the vehicle is reduced.

Abstract: A fuel cell system includes a fuel cell; a circulating system that circulates and supplies fuel off-gas discharged from the fuel cell to the fuel cell; a pump that pumps a fluid in the circulating system; a discharge valve through which the fluid in the circulating system is discharged to the outside; and a control device that controls the pump and the discharge valve. If operation of the fuel cell is started in a cold environment, the control device executes a control to start power generation in the fuel cell for a first period before activating the pump and executes a control to drive the pump while the discharge valve is closed for a second period.

Abstract: A fuel cell system includes a fuel cell stack that generates electricity by an electrochemical reaction using a fuel gas; an insulating first passage member through which produced water that is produced by the electrochemical reaction in the fuel cell stack and off-gas that is discharged from the fuel cell stack pass; a conductive second passage member that is connected to the first passage member; and a produced water flow disrupting portion that is provided on the first passage member and breaks up or stops the flow of the produced water that is introduced from an inside wall of the first passage member to the second passage member.