Abstract: A method of operating a fuel cell system includes the steps of temporarily supplying a raw fuel to an electrode surface of an anode at the time of starting operation of the fuel cell system, supplying water vapor to the electrode surface of the anode at least based on any of the temperature of a fuel cell stack and the temperature of an evaporator after stopping the supply of the raw fuel, and supplying a fuel gas to the electrode surface of the anode by supplying the raw fuel and the water to the evaporator at least based on any of detection results of the pressure of the water supplied to the evaporator, the flow rate of the water supplied to the evaporator), the pressure of the water vapor discharged from the evaporator, and the flow rate of the water vapor discharged from the evaporator.

Abstract: A water recovery assembly for use in a fuel cell system having an anode and a cathode, the anode being adapted to receive fuel and output anode exhaust, the water recovery assembly comprising a first cooling assembly adapted to receive and quench cool the anode exhaust and to recover a first portion of water including electrolyte from the anode exhaust, and to output quenched anode exhaust and the first portion of water, and a second cooling assembly adapted to receive the quenched anode exhaust and to recover a second portion of water from the quenched anode exhaust, the second portion of water being suitable for humidifying the fuel supplied to the anode.

Abstract: A fuel cell includes an electrolyte membrane, an anode which is disposed on one surface of the electrolyte membrane and includes an anode catalyst layer, a cathode which is disposed on the other surface of the electrolyte membrane and includes a cathode catalyst layer, and an adjustment unit which allows at least one of a relative humidity of a gas which is in contact with the anode catalyst layer and a relative humidity of a gas which is in contact with the cathode catalyst layer to be decreased down to less than 100% before a fuel is supplied at the time of starting.

Abstract: A three-way diverter assembly with a movable member is provided. The three-way diverter assembly includes a housing having a first inlet, a second inlet, a first outlet, and a second outlet. The first inlet and the second inlet are adapted to receive a fluid. The movable member, disposed in the housing adjacent the first inlet, is rotatable about an axis from a first positional limit to a second positional limit, and selectively positional therebetween. Fuel cell systems having the three-way diverter assembly for regulating temperature and humidity of a fuel cell stack are also provided.

Abstract: Disclosed is an apparatus and method for activating a fuel cell stack, which significantly reduces the time required for activation and the amount of hydrogen used for the activation by employing a vacuum wetting process in a shutdown operation. In particular, a high humidity open circuit voltage operation humidifies the fuel cell stack and operates the fuel cell stack at an open circuit voltage, and a vacuum wetting operation wets the surface of a polymer electrolyte membrane by creating a vacuum atmosphere in the fuel cell stack. The high humidity open circuit voltage operation and the vacuum wetting operation are performed alternately and repeatedly.

Abstract: A device and a method for controlling the air humidity in a fuel cell detect a step response in the output voltage of a fuel cell when the supply to electrical loads is interrupted, and determine parameters of the dynamic time characteristic from the detected step response, and thus calculate a capacitance of the fuel cell. As a function of any deviation from a predetermined capacitance, a humidity control unit is caused to increase or decrease the humidity. This makes in situ detection of the humidity balance of a fuel cell possible, and this can keep the electrical power thereof constant for a relatively long period, and this can increase the intervals between maintenance.

Abstract: An electrochemical fuel cell having an anode, an ion transfer membrane and a cathode has liquid water delivered to the fluid flow channels within the cathode so as to maintain a relative humidity of 100% throughout the fluid flow channels. A calibration method and apparatus is described for determining an optimum quantity or range of quantities of liquid water to be delivered to the cathode fluid flow channels under varying operating conditions. An operating method and apparatus is described that ensures an optimum quantity of liquid water is delivered to the cathode fluid flow channels under varying operating conditions.

Abstract: In a proton exchange membrane fuel cell power plant (9) in which each fuel cell (11) employs reactant gas flow field channels (51) extending inwardly from a surface of a conductive, hydrophilic reactant gas flow field plate (50), for at least one of the reactants of the fuel cell, a region (63) of the reactant gas flow field channels is substantially shallower than the remaining portion (60) of the flow field channels thereby decreasing resistance to a gas phase mass transfer from the wetted walls of the flow field plate to the gas in the region (63); the resulting increase in thickness of the web (58) adjacent the region (63) reduces the resistance to liquid water transport from the first coolant channel (52) to the inlet edge (55) of the plate (50) providing a higher evaporation rate into the reactant gas in the shallow region (63).

Abstract: A fuel cell system includes a water vapor transport device having a wet flow field layer having a coarse microtruss structure disposed between a pair of fine microtruss structures. The coarse and fine microtruss structures of the wet flow field layer are formed from a radiation-sensitive material. A dry flow field layer has a coarse microtruss structure disposed between a pair of fine microtruss structures. The coarse and fine microtruss structures of the dry flow field layer are also formed from a radiation-sensitive material. A membrane is disposed between the wet flow field layer and the dry flow field layer and adapted to permit a transfer of water vapor therethrough from the wet fluid to the dry fluid to form a humidified fluid.

Abstract: A fuel cell system includes a water vapor transfer unit and a fluid flow distribution feature, the water vapor transfer unit including a first plate having a plurality of first flow channels for receiving a flow of a first fluid therein, and a second plate having a plurality of second flow channels for receiving a flow of a second fluid therein. The fluid flow distribution feature is configured to control at least one of a volume of flow of the first fluid through the first flow channels and a volume of flow of the second fluid through the second flow channels, wherein at least one of a flow distribution of the first fluid across the first plate and a flow distribution of the second fluid across the second plate is varied.

Abstract: A fuel cell system includes a fuel cell formed by stacking a plurality of power generation cells, and an oxygen-containing gas supply apparatus for supplying an oxygen-containing gas to the fuel cell. The oxygen-containing gas supply apparatus includes an oxygen-containing gas supply channel connected to an oxygen-containing gas inlet of the fuel cell for allowing the oxygen-containing gas to flow from an air pump into the oxygen-containing gas inlet, a branch supply channel branched from the oxygen-containing gas supply channel and which is opened to the inside of a fuel cell chamber, an oxygen-containing gas discharge channel for discharging an oxygen-containing off gas from the fuel cell, and an oxygen-containing off gas circulation channel one end of which is connected to the oxygen-containing gas discharge channel, and another end of which is connected to the oxygen-containing gas supply channel at a position upstream from the air pump.

Abstract: A water vapor transfer assembly for a fuel cell system includes at least one water vapor transfer device. The water vapor transfer device permits a transfer of water from a wet stream to a dry stream. The water vapor transfer device is disposed between a pair of end plates. The end plates each have a plurality of outwardly extending ribs. The water vapor transfer device and the end plates are disposed within a housing having a pair of wet stream apertures and a pair of dry stream apertures formed therein. The housing further includes a plurality of channels formed adjacent the dry stream apertures. The channels are in fluid communication with the wet stream apertures. The outwardly extending ribs of the end plates cooperate with the channels to define a tortuous bypass flow path between the wet stream apertures of the housing.

Abstract: A fuel cell system includes a fuel cell stack for generating power and power generation control means. The fuel cell stack has at least one cell that includes a cathode to which an oxidant is supplied, an anode to which a fuel is supplied, and a polymer electrolyte membrane sandwiched between the cathode and the anode. The power generation control means has dryness degree determination means for determining the degree of dryness of the fuel cell stack based on shut-down period. When the shut-down period is shorter than a predetermined period of time, the power generation control means supplies a gas for drying to the cathode for a predetermined period of time, to remove water remaining in the cathode. When the shut-down period is equal to or longer than the predetermined period of time, such a drying operation is not performed.

Abstract: In a device for humidifying a gas flow, an atomized liquid is combined with a gas flow in a spray chamber, and passed through a generally U-shaped gas flow passage having a first generally vertical part 3 through which the atomized liquid and gas passes to a lower part 4. From there, the gas passes generally vertically upwardly to an outlet 9. The lower part of the passage incorporates an opening 6 to a water separator 7. The opening 6 is closable by a float device 10, or includes a flow restricting control valve 13.

Abstract: Disclosed is a humidifier for fuel cell which is capable of realizing high humidifying efficiency owing to the maximum contact area of hollow fiber membranes with reaction gas to be supplied to the fuel cell by enabling the uniform humidifying level in all the hollow fiber membranes provided inside the humidifier.

Abstract: A fuel cell system is provided that is capable of operating at high temperatures and near-ambient pressure with partial humidification of air supplied to the fuel cell stack. The fuel cells of the stack incorporate gas diffusion barrier layers at the cathode side thereof. The system includes a cooling loop for circulating a liquid coolant through the stack. In some embodiments, an incoming air stream is partially humidified with water vapor transferred from a cathode exhaust stream in a gas-exchange humidifier or enthalpy wheel. In other embodiments, a cathode recycle is employed to partially humidify the incoming air. The humidity of the air and cathode exhaust streams is maintained below a stack saturation point. Methods of operating the fuel cell system are also provided.

Abstract: The present invention relates to a manufacturing method a membrane electrode assembly which has a low proton conduction resistance at a boundary of an electrolyte membrane and a catalyst layer. Catalyst ink including solvent, electrolyte 23 having proton permeability, and a carbon 26 supporting platinum is applied on both sides of an electrolyte membrane 4 having proton permeability. The solvent is evaporated for forming catalyst layers 10, 14. Voltage is applied between the catalyst layers 10, 14 under hydrogen atmosphere for forming proton conduction paths at boundaries between the catalyst layers 10, 14 and the electrolyte membrane 4.

Abstract: There are provided a drive unit, a lens module, an image pickup unit, a fuel cell, and an ion exchange resin, in which a characteristic deterioration depending on an ambient environment may be suppressed. The drive unit includes one or more polymer actuator devices. The polymer actuator device is configured using an ion exchange resin containing a moisturizing agent.

Abstract: A humidifier for humidifying a fuel cell composed of an anode side humidifier and a cathode side humidifier each possessing a plurality of hollow fiber membrane modules for migrating moisture between a supply gas, which is supplied to a fuel cell, and an exhaust gas, which is exhausted from the fuel cell to thereby humidify the supply gas, the humidifier comprising: a pair of heads which hold both ends of the hollow fiber membrane modules, a connecting member which connects each of heads, and a device for warming the supply gas composed of conduits through which a cooling medium exhausted from the fuel cell is passed. The device for warming the supply gas is configured so that first warms a humidifier at an outlet side of the supply gas, and then warms a humidifier at an inlet side of the supply gas.

Abstract: Disclosed is a humidifier for fuel cell, which facilitates to maximize humidifying performance and reducing the maintenance cost through the uniform humidification among all the hollow fiber membranes by preventing high-humidity unreacted gas introduced to the inside of membrane housing from flowing concentratedly toward a specific region in the membrane housing, wherein the humidifier comprises a membrane housing; a partition plate for dividing an inner space of the membrane housing into plural unit spaces; plural hollow fiber membranes in each of the unit spaces; and a cover mounted on an end of the membrane housing, the cover including an inlet for introducing unreacted gas of high-humidity discharged from a stack into the membrane housing, wherein plural distribution holes are provided in the membrane housing, the distribution holes corresponding to the unit spaces respectively.

Abstract: A hydrogen generation apparatus 100 of the present invention includes: a reformer 4 for generating a hydrogen-containing gas through a reforming reaction using a raw material gas; a raw material gas supplier 13 for supplying the raw material gas to the reformer 4; a methanator 6 for reducing carbon monoxide contained in the hydrogen-containing gas through a methanation reaction; and a controller for controlling the raw material gas supplier 13 to decrease an amount of the raw material gas supplied to the reformer 4 so as to decrease an amount of generation of the hydrogen-containing gas when a temperature of the methanator 6 increases.

Abstract: A fuel cell system having an apparatus for gas drying that includes, but is not limited to at least one cooling element with at least one first surface and at least one detachment device. The cooling element is designed to be thermally connected to a heat sink and to come into contact with gas flowing past. The detachment device is movably held relative to the first surface and is designed to detach frozen water from the first surface.

Abstract: A glass fiber-based paper diffusion medium, as well as a membrane humidifier for a fuel cell and method for humidifying a fuel cell using the provided glass fiber-based paper diffusion medium. The diffusion medium is a flexible, resin-bonded glass fiber paper impregnated with 26-55% cured liquid phenolic resin and having a thickness of 100-110 ?m and a Gurley permeability of at least 100 cfm.

Abstract: An oxygen-containing gas supply device of a fuel cell system is equipped with an oxygen-containing gas supply flow passage that communicates with an oxygen-containing gas inlet of a fuel cell. An oxygen-containing gas discharge flow passage communicates with an oxygen-containing gas outlet of the fuel cell. A compressor is disposed in the oxygen-containing gas supply flow passage and a supply flow passage sealing valve is disposed downstream from the compressor in the oxygen-containing gas supply flow passage. A discharge flow passage sealing valve is disposed in the oxygen-containing gas discharge flow passage, and a discharge fluid circulation flow passage that communicates with the oxygen-containing gas discharge flow passage is disposed at a location upstream from the discharge flow passage sealing valve, while also communicating with the oxygen-containing gas supply flow passage at a location upstream from the compressor.

Abstract: A fuel cell system includes at least one electricity generating unit for generating electric energy through an electrochemical reaction between oxygen and hydrogen, a reformer for reforming fuel to generate hydrogen gas to be supplied to the electricity generating unit, a fuel supply apparatus for absorbing a liquid fuel stored in a fuel reservoir and supplying the fuel to the reformer and an oxygen supply source for supplying oxygen to the electricity generating unit. The fuel supply apparatus employs an absorber with capillary channels in which osmotic pressure is produced due to a concentration differential caused by thermal energy. The osmotic pressure allows the fuel to flow.

Abstract: A self-humidifying fuel cell is made by preparing a porous substrate, coating the substrate with a zeolitic material and filling the pores with a proton-conducting material. The coating of the substrate includes selecting a zeolitic material, and applying coating on the pore walls and surface of the porous substrate, to form zeolitic material-coated pores. The resulting composite material is used as a self-humidifying proton-conducting membrane in a fuel cell.

Abstract: A fuel cell system is equipped with an expander which is driven by an off-gas exhausted from an oxidant eject path, and which transmits motive power to a compressor, a bypass route in the oxidant eject path which bypasses a humidifier, a flow control valve which changes an opening degree of the bypass route, a voltage sensor which detects an output voltage of the fuel cell stack, a current sensor which detects an output current of the fuel cell stack, and a bypass controlling member which changes a bypass ratio which is a ratio of a magnitude of a flow rate of the off-gas circulating the bypass route with respect to an overall flow rate of the off-gas ejected from the fuel cell stack to the oxidant eject path by the flow control valve according to the output power of the fuel cell stack.

Abstract: A fuel cell system (1), especially for motor vehicles, is provided with at least one fuel cell (2), which has at least two electrodes (3), to which at least one electric user (4) can be connected. The electrodes (3), especially the anode (4), are protected if a temperature-measuring device (8) measures the electrode temperature of at least one of the electrodes (3) and if a control (24) sets the water fed into the fuel cell (2) by a water feed device (11), preferably before the reformate gas enters the fuel cell (2), as a function of the measured electrode temperature.

Abstract: A fuel cell module includes: in a casing, a fuel cell stack that is formed by stacking a plurality of unit cells; and an oxidant gas distributing member that is disposed at a side surface, that extends in a stack direction, of the fuel cell stack, that extends in a direction from one end to another end of each of the unit cells, and that supplies the oxidant gas along the oxidant gas distributing member from the one end to the another end to supply the oxidant gas to the another end of each unit cell. The oxidant gas distributing member includes a heat exchange restraint portion that restrains heat exchange between the unit cells and the oxidant gas in at least one of end portions of the fuel cell stack in the stack direction, in comparison with the heat exchange thereof in other portion in the fuel cell stack.

Abstract: A fuel cell system (1), especially for motor vehicles, is provided with at least one fuel cell (2), which has at least two electrodes (3), to which at least one electric user (4) can be connected. The fuel cell system (1) has, furthermore, a reformer (9) as well as a fuel feed (13) for supplying the reformer (9) with fuel and/or an oxidant gas feed for supplying the reformer (9) with oxidant gas. The fuel cell (2), especially the electrodes (3), is/are protected if a temperature-measuring device (8) measures the electrode temperature of at least one of the electrodes (3) and if a control (24) sets a quantity of fuel fed to reformer (9) and/or a quantity of oxidant gas fed to reformer (9) depending on the measured electrode temperature.

Abstract: An anode reactant recycling system for a fuel cell is disclosed, the system including a hollow main body, a bleed conduit, an injector, a water separator, and a hydrophilic porous media. The anode reactant recycling system for a fuel cell is adapted to minimize a required number of components, eliminate the need for the anode heat exchanger, use a single valve for removal of condensate and reactant byproducts from the anode reactant recycling system, and provide an upstream volume for startup pressurization.

Abstract: A fuel cell system includes: a fuel cell stack configured to have a plurality of unit fuel cells arranged on an identical plane; a chassis configured to cover at least one side of said fuel cell stack via an air flow space; and a condensation water holding member configured to be provided in at least a part between said fuel cell stack and said chassis, have a mesh shape and have a function for keeping moisture.

Abstract: A separator for use in a humidifying device includes: main surfaces contacting steam permeable membranes (2), respectively; a fluid channel (3, 4) formed by concave portions (66, 81) of a convex-concave portion formed on each of the main surfaces; and an elastic layer (1a, 1c) formed up to at least a certain depth from tip ends of convex portions (67, 82) of the convex-concave portion.

Abstract: Included are: a power generation unit configured to generate electric power by consuming a raw material gas that has passed through a gas meter, the gas meter being configured to, if a state where continuously stopping a flow of the raw material gas for a reset period or longer is not performed has continued for a first upper limit period or longer, exert at least one of a function of outputting an abnormality indication signal and a function of blocking the flow of the raw material gas; a raw material gas supply device configured to supply the raw material gas to the power generation unit; and a controller.

Abstract: In a reforming apparatus, for use in a fuel cell, for reforming a raw fuel into a hydrogen-rich reformed gas, a reformer generates the reformed gas from the raw fuel. A shift reactor reduces carbon monoxide contained in the reformed gas through a shift reaction. A selective oxidation unit reduces the carbon monoxide contained in the reformed gas that has passed through the shift reactor by performing selective oxidation on the carbon monoxide. A reforming reaction tube houses linearly the reformer, the shift reactor and the selective oxidation unit in this order.

Abstract: A gas diffusion layer, a manufacturing apparatus and a manufacturing method thereof are provided. The gas diffusion layer having different hydrophilic/hydrophobic structure and channel therein can be manufactured quickly and easily by using a coating mask. The gas diffusion layer is used in various fuel cells to enhance the ability of water management and to solve the problem of flooding at the cathode, the problem of water deficit at the anode, and the problem of gas transfer. The gas diffusion layer includes a gas diffusion medium having a first property and a micro porous layer having a second property. The micro porous layer is formed on one surface of the gas diffusion medium. The micro porous layer has a plurality of channel layers penetrating the gas diffusion medium. One of the first property and the second property is hydrophilic, and the other is hydrophobic.

Abstract: The present invention relates to a process for operating a fuel cell, especially for operating a fuel cell in which the electrolyte responsible for the proton conduction is volatile. By means of the process according to the invention, better operation of such a fuel cell is possible, and they exhibit an improved lifetime.

Abstract: In a fuel cell system, a humidifier is attached to an end plate. A pipe connector of a fluid pipe provided at the end plate such as an oxygen-containing gas inlet manifold and a pipe connector of a fluid pipe of the humidifier such as a humidified air supply pipe are connected through a substantially ring-shaped intermediate pipe. O-rings are attached to annular grooves in the outer circumferential portions of the intermediate pipe. One of the O-rings tightly contacts the inner circumferential surface of the pipe connector of the oxygen-containing gas inlet manifold, and the other of the O-rings tightly contacts the inner circumferential surface of the pipe connector of the humidified air supply pipe.

Abstract: A method of operating a fuel cell power generator, and a fuel cell power generator to be operated by the method, which method enables feeding of a diluted fuel having an optimum concentration to a power generation unit even without measuring an absolute concentration typically using a sensor are provided. Specifically, how an output voltage of the power generation unit varies depending on a flow rate of a diluted fuel is monitored. Thus, the diluted fuel may be adjusted to have an optimum concentration always, even without measuring an absolute concentration typically using a sensor. According to this operation method, output characteristics and electrical efficiencies can be maximized according to a load and conditions of a fuel cell power generator.

Abstract: A fuel cell system includes: a polymer electrolyte fuel cell; a resistance sensor that detects the internal resistance of the fuel cell; a dew point sensor that detects the dew point of anode off gas from the fuel cell; and a controller that executes an electrolyte membrane hydration control according to the relationship between the internal resistance and the dew point. According to this configuration, it is possible to define, based on the relationship between the internal resistance and the dew point, the conditions under which the decreased power generation performance of the cell may be quickly recovered.

Abstract: A fuel cell system comprises a fuel gas supply conduit which supplies fuel gas to a fuel cell, a circulation conduit which returns discharged fuel gas discharged from the fuel cell to the fuel gas supply conduit, and a control device. When the control device determines that freezing may occur, the control device releases the discharged fuel gas from a water discharge valve of a gas-liquid separator provided in the circulation conduit to the outside, and reduces the flow volume of the discharged fuel gas returned to the fuel gas supply conduit in order to reduce moisture contained in the gas. Consequently, freezing can be prevented using a simple structure.

Abstract: A flow shifting fuel cell with water separator. The water separator is used to control the amount of moisture that passes through the anode flowpath of one or more fuel cells in one or more fuel cell stacks. The water separator is made up of a housing to direct the flow of a moisture-bearing fluid as well as act as a collection and container for separated moisture. Fluid that is cyclically passing through the fuel cell stack as part of its flow shifting mode of operation oscillates back and forth across a separation chamber formed within the water separator, thereby allowing bidirectional control of the moisture content within the fluid. A drain is formed in the separation chamber to allow removal of condensed water.

Abstract: Various hot box fuel cell system components are provided, such as heat exchangers, steam generator and other components.

Abstract: Various hot box fuel cell system components are provided, such as heat exchangers, steam generator and other components.

Abstract: One aspect of the invention includes the discovery that pinholes in the membrane of the membrane electrode assembly may be caused by hygroexpansive ratcheting. In one embodiment of the invention, a fuel cell stack including a plurality of cells each having a membrane electrode assembly each including a membrane manufactured by an extrusion method and operated so that the rate of drying during humidity cycling is sufficiently low to reduce or eliminate build up stresses in the membrane electrode assembly.

Abstract: The invention pertains to a process for operating a polymer electrolyte membrane fuel cell (PEMFC), said PEMFC comprising: (a) a membrane comprising at least one fluorinated ionomer [polymer (I)] comprising recurring units derived from tetrafluoroethylene (TFE) and from at least one monomer of formula (M): wherein m is an integer between 1 and 6 and X? is chosen among halogens (Cl, F, Br, I), —O?M+, wherein M+ is a cation selected among H+, NH4+, K+, Li+, Na+, or mixtures thereof, said polymer (I) having an equivalent weight (EW) of from 700 to 850 g/eq.; (b) a cathode; (c) an anode; said process comprising: (i) feeding gaseous reactants at the electrodes at a relative humidity of at most 66%; (ii) maintaining an average current density between 0.05 and 1.5 A/cm2; and (iii) maintaining an average temperature of more than 65° C.

Abstract: To mitigate bubble blockage in water passageways (78, 85), in or near reactant gas flow field plates (74, 81) of fuel cells (38), passageways are configured with (a) intersecting polygons, obtuse angles including triangles, trapezoids, or (b) hydrophobic surfaces (111), or (c) differing adjacent channels (127, 128), or (d) water permeable layers (93, 115, 116, 119) adjacent to water channels or hydrophobic/hydrophilic layers (114, 120).

Abstract: A polymer electrolyte fuel cell includes a cathode, an anode, and an electrolyte membrane sandwiched between the cathode and the anode. A plurality of projections each having a height of 5 to 15 ?m or a plurality of depressions each having a depth of 5 to 15 ?m are formed on a surface of the electrolyte membrane, the surface being opposed to the cathode. The cathode is constituted by a catalyst layer formed to tightly contact the surface of the electrolyte membrane and having a maximum thickness that is one to three times the height of the projection or the depth of the depression. An oxygen-containing gas having a relative humidity of 10% or less is supplied to the cathode, and electric power is generated by using the polymer electrolyte fuel cell.

Abstract: In a fuel cell system a specific connection and a valve arrangement make it possible for a compressor to supply precompressed air to a fuel cell stack via a waste gas line, said air then leaving the fuel cell stack via a line which is otherwise an air feed line. In this way, a humidifier may be bypassed. This is sensible in particular during a start phase at low ambient temperatures, during which the fuel cell system is intended to warm up without moisture in the fuel cell stack having a negative effect, for instance by freezing. The compressor may be operated both in the start phase or stop phase and during conventional operation by the same mode of operation.

Abstract: A fuel cell system provided with a fuel cell module, a water supply device for supplying water to the fuel cell module, a water container for supplying water to the water supply device, and a condenser for condensing water vapor in the exhaust gas which is discharged from the fuel cell module and supplying the condensed water to the water container. The water container contains therein an ion exchange device for removing impurities which are contained in the water supplied from the condenser. The water supply device is provided below and downstream of the water container. A pressure regulating device for absorbing a pulsation of the water supply device and absorbing the variation in the pressure in the fuel cell module is provided between the water supply device and the fuel cell module.