The fuel cell system determines whether or not condensation is occurring in the anode gas and the cathode gas on the basis of the humidity of the cathode gas detected by a first humidity sensor provided in the power generation cells and the humidity of the anode gas detected by a second humidity sensor provided in the power generation cells, and adjusts the water content in the cathode gas and/or the anode gas in which condensation is occurring.

A fuel cell cooling system may include a fuel cell module including a fuel cell stack, a cooling module that includes a cooling tower in which cooling fluid is accommodated and adjusts a temperature of the fuel cell module, a heat exchanger that exchanges heat between first circulation cooling water circulating in the fuel cell module and second circulation cooling water circulating in the cooling tower, and a condensate supply line connected to the cooling tower to supply, to the cooling tower, water generated in a power generation process of the fuel cell module.

A humidifier has a plurality of humidifier modules that are clamped between end plates by tie rods and have a membrane that is permeable to water vapor, in which on both sides of the membrane there is respectively arranged a flow field frame having a multiplicity of webs defining a flow field. The tie rods are configured as hollow rods forming coolant tubes for a coolant to be led through. A fuel cell device and a motor vehicle having such a humidifier are also provided.

A fuel cell single unit including: a fuel cell element in which an anode layer and a cathode layer are formed so as to sandwich an electrolyte layer; a reducing gas supply path for supplying a gas containing hydrogen to the anode layer; an oxidizing gas supply path for supplying a gas containing oxygen to the cathode layer; and an internal reforming catalyst layer, which has a reforming catalyst for steam-reforming a fuel gas, in at least a part of the reducing gas supply path is provided. An external reformer, which has a reforming catalyst for steam-reforming the fuel gas, is provided upstream of the reducing gas supply path, and the fuel gas partially reformed by the external reformer is supplied to the reducing gas supply path.

The present disclosure relates to a fuel cell system including: an air supply line configured to supply air to a fuel cell stack; a discharge line connected to the fuel cell stack and configured to guide exhaust gas discharged from the fuel cell stack; a discharge adapter connected to the discharge line and configured to discharge the exhaust gas to the outside; and a bypass line having one end connected to the air supply line and the other end connected to the discharge adapter, the bypass line being configured to selectively allow the air to flow from the air supply line to the discharge adapter, thereby effectively reducing a hydrogen concentration in exhaust gas discharged from the fuel cell stack.

A method of operating a fuel cell system includes providing an anode exhaust from a fuel cell stack to a water injector, supplying water to the water injector, and injecting the water from the water injector into the anode exhaust to vaporize the water and generate a humidified anode exhaust.

The present invention relates to a fuel cell membrane humidifier and a fuel cell system comprising same, wherein exhaust gas discharged from a fuel cell stack is introduced into a fuel cell membrane humidifier in both directions, whereby the humidification efficiency can be improved. The fuel cell system according to an embodiment of the present invention comprises: a blower which supplies dry gas; a fuel cell stack; and a fuel cell membrane humidifier which includes a mid-case, a first exhaust gas inlet formed at one surface of the mid-case, a second exhaust gas inlet formed at the other surface of the mid-case, and one exhaust gas outlet formed at the other surface of the mid-case.

The present invention relates to a membrane humidifier for a fuel cell capable of simplifying a fuel cell system and miniaturizing the fuel cell system by performing humidification by moisture exchange and cooling by heat exchange in one membrane humidifier, and a fuel cell system comprising same. The membrane humidifier for a fuel cell of the present invention comprises both a humidification module and a heat exchange module in a housing part, and distributes a first fluid to the humidification module and the heat exchange module at a variable distribution ratio.

A humidifier that can maintain high sealing performance between a separator and a water exchange membrane without applying an excessive external force to the separator even in the event of temperature change is provided. Humidifying modules each include plate-shaped separators each including a dry gas-side water exchange portion formed on one side and a water-containing gas-side water exchange portion formed on the other side. The humidifying module is structured by stacking a plurality of the separators in a state in which a water exchange membrane is disposed between the dry gas-side water exchange portion and the water-containing gas-side water exchange portion facing each other. A loop-shaped partition member that forms a pressurization space between the adjacent humidifying modules is provided in a state in which the humidifying modules are stacked to guide a fluid into the pressurization space.

A membrane humidifier has multiple stacking units mounted one on top of the other, where an individual stacking unit includes a flow plate and diffusion unit, where a circumference of the diffusion unit is formed by two oppositely situated first edge sides and two oppositely situated second edge sides. The diffusion unit includes: a top layer on a top side of the diffusion unit, a bottom layer on a bottom side of the diffusion unit, a moisture-permeable membrane, two oppositely situated upper receiving elements at the two first edge sides, on the top side of the diffusion unit, and two oppositely situated lower receiving elements at the two second edge sides, on the bottom side of the diffusion unit, where the flow plate of the stacking unit is inserted into the two lower receiving elements, and where the next stacking unit is inserted into the two upper receiving elements.