Air-cooled fuel cell system

Abstract

To provide a fuel cell system that can prevent the occurrence of an abnormal electric potential of a fuel cell.SOLUTION: An air-cooled fuel cell system is provided. The fuel cell system comprises a fuel cell, a hydrogen system that supplies hydrogen to the fuel cell, a reaction air system that supplies reaction air to the fuel cell, and a cooling air system that supplies cooling air to the fuel cell. The fuel cell has a reaction air channel and a cooling air channel having independent channel structures of the reaction air and the cooling air. During stop of the fuel cell system, the system cuts off a cathode and an anode of the fuel cell from the outside of the fuel cell system. At the start-up of the fuel cell system, the system starts supply of the hydrogen to the fuel cell and supply of the cooling air to the fuel cell, while stopping supply of the reaction air to the fuel cell. After the lapse of predetermined time from the start-up of the fuel cell system, the system starts supply of the reaction air to the fuel cell.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to air-cooled fuel cell systems. [Background technology]

[0002] Various technologies have been proposed regarding fuel cells (FCs), such as those disclosed in Patent Documents 1 to 3. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-216783 A [Patent Document 2] JP 2009-158203 A [Patent Document 3] JP 2022-185247 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of an open-type air-cooled fuel cell, the cathode remains open between the time the system was shut down and the time it is started up again, so air is present at the cathode. During this time, an abnormal voltage is generated in the fuel cell, causing it to deteriorate.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and has as its main object to provide an air-cooled fuel cell system that can suppress the occurrence of abnormal potential in the fuel cell. [Means for solving the problem]

[0006] In a first embodiment of the present disclosure, there is provided an air-cooled fuel cell system, the fuel cell system includes a fuel cell, a hydrogen system that supplies hydrogen to the fuel cell, a reaction air system that supplies reaction air to the fuel cell, and a cooling air system that supplies cooling air to the fuel cell; the fuel cell has a reaction air flow path and a cooling air flow path having an independent flow path structure for the reaction air and the cooling air, the fuel cell system isolates the cathode and the anode of the fuel cell from the outside of the fuel cell system when the system is stopped; the fuel cell system, when starting up the system, stops the supply of the reaction air to the fuel cell, while starting the supply of the hydrogen to the fuel cell and the supply of the cooling air to the fuel cell; The fuel cell system is characterized in that the supply of the reaction air to the fuel cell is started after a predetermined time has elapsed since the start-up of the system.

[0007] In the second embodiment of the present disclosure, in the first embodiment, the reaction air system has a reaction air blowing means, The cooling air system includes a cooling air blowing means, A hydrogen discharge passage of the hydrogen system may merge with a cooling air discharge passage of the cooling air system.

[0008] In a third embodiment of the present disclosure, the fuel cell system in the first embodiment further comprises an electrical system, The fuel cell system may connect the fuel cell to a power line of the electrical system when the system is started up.

[0009] In a fourth embodiment of the present disclosure, in the first embodiment, the hydrogen system may have a hydrogen pump. Effect of the Invention

[0010] The fuel cell system of the present disclosure can suppress the occurrence of abnormal potential in the fuel cell. [Brief description of the drawings]

[0011] [Figure 1] 1 is an exploded perspective view showing an example of a single cell of a fuel cell provided in a fuel cell system according to the present disclosure; [Diagram 2]1 is a schematic perspective view showing an example of a fuel cell stack provided in a fuel cell system according to the present disclosure. [Diagram 3] 1 is a system configuration diagram showing an example of a fuel cell system according to the present disclosure. [Figure 4] 2 is a circuit diagram showing an example of an electrical system provided in the fuel cell system of the present disclosure. FIG. [Diagram 5] 4 is a flowchart showing an example of control of the fuel cell system of the present disclosure. [Figure 6] 6 is a flowchart showing another example of the control of the fuel cell system according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present disclosure will be described. Note that matters other than those specifically mentioned in this specification and necessary for implementing the present disclosure (for example, the general configuration and manufacturing process of a fuel cell system that does not characterize the present disclosure) can be understood as design matters of a person skilled in the art based on the prior art in the field. The present disclosure can be implemented based on the contents disclosed in this specification and the technical common sense in the field. Furthermore, the dimensional relationships (length, width, thickness, etc.) in the drawings do not reflect the actual dimensional relationships. In the present disclosure, the gas supplied to the anode of the fuel cell is a fuel gas (anode gas), and the gas supplied to the cathode of the fuel cell is an oxidant gas (cathode gas). The fuel gas is a gas that mainly contains hydrogen and may be hydrogen. The oxidant gas is a gas that contains oxygen and may be oxygen, air, etc. In the present disclosure, air as the oxidant gas is referred to as reaction air, and air as the cooling gas is referred to as cooling air.

[0013] The present disclosure provides an air-cooled fuel cell system, comprising: the fuel cell system includes a fuel cell, a hydrogen system that supplies hydrogen to the fuel cell, a reaction air system that supplies reaction air to the fuel cell, and a cooling air system that supplies cooling air to the fuel cell; the fuel cell has a reaction air flow path and a cooling air flow path having an independent flow path structure for the reaction air and the cooling air, the fuel cell system isolates the cathode and the anode of the fuel cell from the outside of the fuel cell system when the system is stopped; the fuel cell system, when starting up the system, stops the supply of the reaction air to the fuel cell, while starting the supply of the hydrogen to the fuel cell and the supply of the cooling air to the fuel cell; The fuel cell system is characterized in that the supply of the reaction air to the fuel cell is started after a predetermined time has elapsed since the start-up of the system.

[0014] When air is put into the cathode and hydrogen into the anode without current flow, the potential of the fuel cell becomes high (about 0.95 to 1.05 V). In this state, the fuel cell begins to deteriorate, albeit slowly. In addition, an oxide film forms on the Pt catalyst, causing a decrease in the performance of the catalyst. To avoid this, the potential of the fuel cell may be kept constant at 0.85 V or less. In typical open-type air-cooled fuel cells, the openings in the air system are large and it is difficult to seal the air system, so when the system is started up, oxygen is present at both electrodes, making it impossible to avoid the occurrence of a high potential state in the fuel cell. Even if the cathode is sealed, it is necessary to dilute the exhaust hydrogen by replacing the nitrogen, oxygen, moisture, etc. of the hydrogen system with hydrogen when the system is started. If the reaction air blower or other reaction air blowing means is turned on to let reaction air into the cathode before hydrogen is introduced for dilution, the above-mentioned high potential state or abnormal potential will occur.

[0015] This disclosure relates to improving the performance of air-cooled fuel cells, and proposes a configuration and method for smoothly starting up the system while preventing the occurrence of abnormal potential and deterioration of the fuel cell. A fuel cell having a flow path structure in which reaction air and cooling air are independent is started up in a specified procedure. When the system is started up, the supply of reaction air is stopped and hydrogen-based nitrogen, oxygen, moisture, etc. are quickly purged while replacing the anode with hydrogen, thereby suppressing the occurrence of abnormal potential in the fuel cell. The hydrogen exhausted to the outside of the fuel cell system when the system is started up can be diluted with cooling air.

[0016] The fuel cell system includes a fuel cell that generates electricity by reacting hydrogen with air, a hydrogen system that supplies the hydrogen needed to generate electricity to the fuel cell, a reaction air system that supplies reaction air to the fuel cell, and a cooling air system that supplies cooling air to the fuel cell to cool the heat generated by power generation.

[0017] The fuel cell may have only one unit cell (cell) of the fuel cell, or may be a fuel cell stack (stack) which is a laminate of a plurality of cells. In this disclosure, both cells and fuel cell stacks may be referred to as fuel cells. The number of cells stacked in the fuel cell stack is not particularly limited, and may be, for example, from 2 to several hundred. The fuel cell stack may have wavy cooling fins on each cell to provide cooling air flow paths. The fuel cell stack may have current collector plates, pressure plates, etc. at the ends in the stacking direction.

[0018] A fuel cell has a reactant air flow path (oxidant gas flow path) and a cooling air flow path (cooling gas flow path) with independent flow path structures for the reactant air and the cooling air, and may further have a hydrogen gas flow path (fuel gas flow path). A flow path structure in which the reaction air and the cooling air are separate means that there is no sharing of air between the flow paths from the supply of air to the fuel cell to the exhaust of air from the fuel cell. Note that the flow path for exhausting the air exhausted from the fuel cell to the outside of the fuel cell system may or may not be separate.

[0019] The cell may have a flow path structure for passing the reaction air and the cooling air such that the flow of the cooling air and the flow of the reaction air cross each other in a plan view. The flow of the cooling air and the flow of the reaction air may cross each other or be perpendicular to each other. The cell may have a power generation portion. The power generating section may have a rectangular shape in a plan view. The power generating section may be a membrane electrode assembly (MEA) including an electrolyte membrane and two electrodes. The electrolyte membrane may be a solid polymer electrolyte membrane. Examples of the solid polymer electrolyte membrane include a fluorine-based electrolyte membrane such as a thin film of perfluorosulfonic acid containing water, and a hydrocarbon-based electrolyte membrane. The electrolyte membrane may be, for example, a Nafion membrane (manufactured by DuPont). The two electrodes are the anode (fuel electrode or hydrogen electrode) and the cathode (oxygen electrode or air electrode). The electrodes include a catalyst layer and may include a gas diffusion layer as necessary, and the power generating portion may be a membrane electrode gas diffusion layer assembly (MEGA). The catalyst layer includes a catalyst, and the catalyst may include a catalytic metal that promotes an electrochemical reaction, an electrolyte having proton conductivity, and a carrier having electron conductivity. Examples of the catalytic metal that can be used include platinum (Pt) and alloys of Pt with other metals (e.g., Pt alloys mixed with cobalt and nickel, etc.) The catalytic metal used as the cathode catalyst and the catalytic metal used as the anode catalyst may be the same or different. The electrolyte may be a fluorine-based resin, etc. As the fluorine-based resin, for example, a Nafion solution, etc. may be used. The catalytic metal is supported on a carrier, and in each catalyst layer, the carrier supporting the catalytic metal (catalyst-supporting carrier) and the electrolyte may be mixed. The support for supporting the catalytic metal may be, for example, a carbon material such as carbon that is generally available commercially. The gas diffusion layer may be a conductive member having air holes. Examples of the conductive member include porous carbon materials such as carbon cloth and carbon paper, and porous metal members such as metal mesh and foamed metal. A cell of the fuel cell may include a separator. The separators collect the electric current generated by power generation and function as partition walls. In a fuel cell, the separators are usually arranged on both sides of the power generation section in the stacking direction so that the power generation section is sandwiched between a pair of separators. One of the pair of separators is an anode separator and the other is a cathode separator. The anode separator may have grooves that serve as hydrogen gas flow paths on the surface facing the power generation section. The cathode separator may have grooves that serve as reaction air channels on the surface facing the power generation section. The separator may have holes forming a manifold such as supply holes and discharge holes for circulating a fluid in the stacking direction of the cells. The separator may be made of, for example, dense carbon obtained by compressing carbon to make it gas impermeable, or a press-molded metal (for example, iron, titanium, stainless steel, etc.). The cell may include an insulating resin frame disposed on the outer side (periphery) of the membrane electrode assembly in the planar direction between the anode separator and the cathode separator. The resin frame is molded into a plate-like and frame-like shape using a thermoplastic resin, and seals the gap between the anode separator and the cathode separator while holding the membrane electrode assembly in its central region. For the resin frame, for example, a resin such as PE, PP, PET, or PEN can be used. The resin frame may be a three-layer sheet composed of three layers with an adhesive layer disposed on the surface layer.

[0020] The fuel cell system may include a control device. The control device may control the reaction air system, the hydrogen system, the cooling air system, etc., and may control the entire fuel cell system. The control device physically has, for example, a processing device such as a CPU (central processing unit), a ROM (read-only memory) that stores control programs and control data processed by the CPU, a storage device such as a RAM (random access memory) that is mainly used as various working areas for control processing, and an input / output interface, and may be an ECU (electronic control unit), etc.

[0021] The reaction air system supplies reaction air to the fuel cell as an oxidant gas, and adjusts the flow rate of the reaction air. The hydrogen system supplies hydrogen as a fuel gas to the fuel cell and adjusts the flow rate of the hydrogen, and may include a hydrogen tank, a hydrogen inlet valve, an injector, a gas-liquid separator, a hydrogen purge valve, an ejector for hydrogen circulation, a hydrogen pump for hydrogen circulation, and hydrogen piping. The cooling air system supplies cooling air as a cooling gas to the fuel cell, and adjusts the flow rate of the cooling air.

[0022] The reaction air system may have an inlet-side sealing valve at the reaction air inlet of the fuel cell, and an outlet-side sealing valve at the reaction air outlet of the fuel cell. In the present disclosure, the fuel cell has an independent flow path structure for the reaction air and the cooling air, and valves (an inlet side sealing valve and an outlet side sealing valve) are installed at the inlet and outlet of the reaction air of the fuel cell in the reaction air system, making it possible to seal the cathode of the fuel cell with a smaller volume than when the fuel cell has a flow path structure in which the reaction air and the cooling air are common.

[0023] The reaction air system may have a reaction air blowing means, the cooling air system may have a cooling air blowing means, and the hydrogen exhaust flow path of the hydrogen system may merge with the cooling air exhaust flow path of the cooling air system. The hydrogen exhaust flow path of the hydrogen system may further have a junction part that can merge with the reaction air exhaust flow path of the reaction air system. By having independent blowing means for the reaction air system and the cooling air system, and by having the hydrogen exhaust flow path merge with the cooling air exhaust flow path, when replacing hydrogen in the hydrogen system at system startup, the fuel cell system can stop the reaction air blowing means and drive the cooling air blowing means, thereby diluting the exhausted hydrogen with cooling air and discharging it outside the fuel cell system. The reaction air blowing means and the cooling air blowing means may be an air compressor, an air pump, an air blower, an air fan, or the like, respectively. The reaction air system may have a reaction air intake port for taking in reaction air from outside the fuel cell system, and the reaction air intake port may be provided with a pressure loss body such as an air filter. The cooling air system may have a cooling air intake port through which cooling air is taken in from outside the fuel cell system, and the cooling air intake port may be provided with a pressure loss body such as an air filter.

[0024] The fuel cell system isolates the cathode and anode of the fuel cell from the outside of the fuel cell system when the system is shut down. When the fuel cell system starts up, it stops the supply of reaction air to the fuel cell and starts the supply of hydrogen and cooling air to the fuel cell. The fuel cell system starts the supply of reaction air to the fuel cell a predetermined time after the system is started up. The cathode may be isolated from the outside of the fuel cell system by closing the reaction air inlet side sealing valve and the reaction air outlet side sealing valve. The anode may be isolated from the outside of the fuel cell system by closing the hydrogen inlet valve and the hydrogen purge valve.

[0025] Deterioration of the fuel cell can be prevented by starting up the fuel cell system according to the startup sequence below. (1) Startup sequence 1 With the reaction air inlet sealing valve, reaction air outlet sealing valve, hydrogen inlet valve, and hydrogen purge valve all sealed and the cathode and anode isolated from the outside of the fuel cell system, hydrogen replacement of the hydrogen system is performed with the fuel cell system stopped. When opening and closing the hydrogen purge valve to purge the hydrogen system, the blowing means of the reaction air system may be stopped to keep the cathode sealed, and the cooling fan of only the cooling air system may be turned on to introduce cooling air into the fuel cell and perform hydrogen dilution. (2) Startup sequence 2 After a predetermined time has elapsed since the system was started, the reaction air inlet side sealing valve and the reaction air outlet side sealing valve are opened, the air blower of the reaction air system is turned on, reaction air is introduced into the fuel cell, and power generation of the fuel cell is started. The predetermined time can be set appropriately or may be set in advance.

[0026] By using a fuel cell with an independent flow path structure for the reactive air and the cooling air, providing a reactive air inlet side sealing valve and a reactive air outlet side sealing valve in the reactive air system, and making the cathode a sealed structure, oxygen is prevented from entering the fuel cell when the system is stopped. Unlike conventional air-cooled fuel cells, the anode can be made oxygen-free at startup. From this state, hydrogen replacement is performed at the anode before introducing reactive air into the cathode in (1) startup sequence 1. In order to purge the hydrogen system, dilution and exhaust with air are required. At this time, by providing an independent blowing means in the cooling air system, hydrogen exhaust can be safely performed while keeping the cathode sealed by operating only the cooling fan of the cooling air system without operating the blowing means of the reactive air system. After hydrogen replacement of the anode is completed, reactive air is introduced into the cathode in (2) startup sequence 2, and power generation of the fuel cell can be started without generating abnormal potential.

[0027] The fuel cell system may include an electrical system. The electrical system may include a diode on the power line to the fuel cell, and may further include a relay for the fuel cell. By including the diode, it is possible to prevent the occurrence of a reverse current from the power line to the fuel cell. In the fuel cell system, the fuel cell may be connected to a power line of an electrical system at the time of system startup, with a power consumption absorbing means such as a secondary cell (battery) or a capacitor being connected to the power line. In the case of a configuration in which a diode and a relay are installed in the power line of the electrical system, the fuel cell and the power line are connected by a relay before the above (1) start-up sequence 1 is performed or before the above (2) start-up sequence 2 is performed. When hydrogen or reaction air is introduced, a high potential can be prevented and V1≦V2 can be set. If the fuel cell and the power line are not connected by a relay and reaction air is introduced to the fuel cell while the fuel cell is in an open circuit state, the cell voltage of the fuel cell will be a high potential (over 0.9 V) of the open circuit voltage (OCV), and the deterioration of the fuel cell will progress. By connecting the power line and the fuel cell via a diode before introducing reaction air to the fuel cell, the generation of a reverse current can be avoided and the potential of the fuel cell can be maintained below V2. V2 may be adjusted by a power consumption absorbing means such as a connected battery or capacitor so that the cell voltage is in an operating range below 0.85 V.

[0028] The hydrogen system may have a hydrogen pump for circulation. By providing a hydrogen pump, hydrogen replacement and drainage can be performed efficiently with a small amount of hydrogen. The hydrogen concentration in the fuel cell can be quickly equalized, and deterioration due to localized hydrogen deficiency can be prevented. During start-up sequence 2, a hydrogen pump may be used to circulate the hydrogen system to make the hydrogen concentration in the hydrogen system uniform.

[0029] FIG. 1 is an exploded perspective view showing an example of a single cell of a fuel cell provided in a fuel cell system of the present disclosure. 1 includes cooling fins (cooling air flow paths) 2 that serve as flow paths for cooling air (cooling gas) 7, a reaction air inlet 3, a reaction air outlet 4, a hydrogen gas inlet 5, a hydrogen gas outlet 6, two separators 11, and an MEA and a resin frame 12 sandwiched between the two separators 11. As shown in FIG. 1, the fuel cell 1 has a flow path structure in which the reaction air 9 and the cooling air 7 are independent of each other.

[0030] FIG. 2 is a schematic perspective view showing an example of a fuel cell stack included in the fuel cell system of the present disclosure. The fuel cell stack shown in FIG. 2 is a laminate in which a plurality of cells 1 are stacked, and includes a current collector plate 13 and a pressure plate 14 on both ends in the stacking direction.

[0031] FIG. 3 is a system configuration diagram showing an example of a fuel cell system according to the present disclosure. The fuel cell system shown in Fig. 3 includes a fuel cell stack 10, a reaction air system 20, a cooling air system 30, and a hydrogen system 40. The reaction air system 20 includes a reaction air intake port 21, an air blower 22, an inlet side sealing valve 23, and an outlet side sealing valve 24. The cooling air system 30 includes a cooling fan 31. The hydrogen system 40 includes a hydrogen tank 41, a hydrogen inlet valve 42, a gas-liquid separator 43, a hydrogen purge valve 44, and a hydrogen pump 45. The fuel cell system shown in Fig. 3 includes sealing valves 23, 24 at the inlet and outlet of the reaction air system 20, and includes independent blowing means 22, 31 for the reaction air system 20 and the cooling air system 30.

[0032] FIG. 4 is a circuit diagram showing an example of an electrical system included in the fuel cell system of the present disclosure. The electrical system 50 shown in FIG. 4 includes a power line 51, a diode 52, a relay 53, a power consumption absorbing means 54 such as a battery / capacitor, auxiliary equipment 55, and a power consumption device 56. By installing a diode 52 on the power line 51 and connecting the fuel cell stack 10 to the power line 51 during recovery control, it is possible to shorten the recovery control time while avoiding the occurrence of reverse current from the power line 51 to the fuel cell stack 10.

[0033] FIG. 5 is a flowchart showing an example of the control of the fuel cell system of the present disclosure. FIG. 5 shows a fuel cell system configuration including a hydrogen pump, a relay, and a diode, and performs a startup sequence. The fuel cell system is started from a state where it has been left unattended and the fuel cell voltage V1 ≒ 0V. Connect the relay of the fuel cell. Since the fuel cell voltage V1 < V2 and there is a diode, no current flows. Perform hydrogen replacement of the hydrogen system. Open the hydrogen inlet valve and introduce hydrogen into the anode. The hydrogen inlet valve may be appropriately opened and closed, for example, to create a pulsed air flow. If oxygen has entered the cathode during a long-term stop, and the relay is not connected, the cell may become at a high potential (OCV ≒ 1.0V) here, and the deterioration of the fuel cell may progress. To dilute the exhaust hydrogen, turn on the cooling fan of the cooling air system in advance. When the reaction air and the cooling air have an independent flow path structure and the reaction air system and the cooling air system do not have independent blowing means, the reaction air will pass through the cathode here, and the cathode will become at a high potential or an abnormal potential. In order to avoid a high potential or an abnormal potential, a device such as a three-way valve for bypassing the cathode and flowing air is additionally required. Since the hydrogen only needs to be diluted until it reaches the exhaust port in contact with the outside of the fuel cell system, the ON-OFF timing of the cooling air fan may be slightly before or after the opening and closing of the hydrogen purge valve. Open the hydrogen purge valve to discharge nitrogen, oxygen, moisture, etc. that have accumulated during system shutdown. Turn on the hydrogen pump to equalize the hydrogen concentration in the anode. If liquid water has accumulated during system shutdown, etc., the hydrogen purge valve is opened and closed while the hydrogen pump is on to perform exhaust drainage. When the exhaust drainage is completed and the anode is filled with high-concentration hydrogen, the hydrogen replacement is completed. Open the inlet / outlet sealing valve of the reaction air system and introduce air into the cathode. If the relay is not connected at this time, the cell will be at a high potential (OCV ≒ 1.0 V), which may accelerate the deterioration of the fuel cell. Although the cell will be at a high potential temporarily, the relay can be connected after the reaction air is supplied. A predetermined amount of reaction air required for power generation is sent to the cathode by an air blower in the reaction air system, and power generation in the fuel cell begins.

[0034] FIG. 6 is a flowchart showing another example of the control of the fuel cell system of the present disclosure. FIG. 6 shows a fuel cell system configuration that does not include a hydrogen pump and performs hydrogen replacement. After being left alone for a while, the fuel cell system is started up from a state in which the fuel cell voltage V1 is approximately 0V. Replace the hydrogen in the hydrogen system by opening the hydrogen inlet valve and introducing hydrogen into the anode. To dilute the exhaust hydrogen, turn on the cooling fan of the cooling air system in advance. The hydrogen purge valve is opened and closed to discharge nitrogen, oxygen, moisture, etc. that had accumulated while the system was shut down. When exhaust drainage is complete and the anode is filled with high-concentration hydrogen, hydrogen replacement is considered to be complete. [Explanation of symbols]

[0035] 1. Cell 2. Cooling fins (cooling air flow path) 3.Reaction air inlet 4.Reaction air outlet 5. Hydrogen gas inlet 6. Hydrogen gas outlet 7. Cooling air (cooling gas) 8. Hydrogen gas 9.Reaction air 10. Fuel Cell Stack 11. Separator 12.MEA, resin frame 13. Current collector plate 14. Pressure plate 20.Reaction air system 21.Reaction air intake 22. Air Blower 23. Inlet side sealing valve 24.Outlet side sealing valve 30. Cooling air system 31. Cooling fan 40. Hydrogen 41. Hydrogen tank 42. Hydrogen inlet valve 43. Gas-liquid separator 44. Hydrogen purge valve 45. Hydrogen pump 50. Electrical system 51. Power Lines 52. Diode 53. Relay 54. Means of absorbing power consumption 55. Auxiliary equipment 56.Power consumption equipment

Claims

1. An air-cooled fuel cell system, the fuel cell system includes a fuel cell, a hydrogen system that supplies hydrogen to the fuel cell, a reaction air system that supplies reaction air to the fuel cell, and a cooling air system that supplies cooling air to the fuel cell; the fuel cell has a reaction air flow path and a cooling air flow path having an independent flow path structure for the reaction air and the cooling air, the fuel cell system isolates the cathode and the anode of the fuel cell from the outside of the fuel cell system when the system is stopped; the fuel cell system, when starting up the system, stops the supply of the reaction air to the fuel cell, while starting the supply of the hydrogen to the fuel cell and the supply of the cooling air to the fuel cell; The fuel cell system is characterized in that the supply of the reaction air to the fuel cell is started after a predetermined time has elapsed since the start-up of the fuel cell system.

2. The reaction air system has a reaction air blowing means, The cooling air system includes a cooling air blowing means, 2. The fuel cell system according to claim 1, wherein the hydrogen discharge flow passage of the hydrogen system merges with a cooling air discharge flow passage of the cooling air system.

3. The fuel cell system includes an electrical system; 2. The fuel cell system according to claim 1, wherein the fuel cell is connected to a power line of the electrical system when the system is started up.

4. The fuel cell system according to claim 1 , wherein the hydrogen system comprises a hydrogen pump.

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