JP5755552B2 - FUEL CELL SYSTEM AND CONTROL METHOD FOR FUEL CELL SYSTEM - Google Patents

Description

  The present invention relates to a fuel cell system that supplies fuel gas and an oxidizing gas to a fuel cell, and generates electricity by causing an electrochemical reaction between the fuel gas and the oxidizing gas, and a control method for the fuel cell system.

  For example, a so-called fuel cell vehicle is equipped with a fuel cell system having a fuel cell. In this fuel cell system, a fuel gas and an oxidizing gas are supplied from a gas supply source to the fuel cell, and the fuel gas and the oxidizing gas are electrochemically reacted in the fuel cell to generate electric power. The fuel cell vehicle uses the electric power as power. The fuel cell has a stack of cells, and supplies fuel gas to the anode flow channel of each cell, supplies oxidizing gas to the cathode flow channel, and generates electricity by reacting these gases through the electrolyte.

  In the fuel cell vehicle, for the purpose of improving fuel efficiency, an operation (intermittent operation) is performed in which the supply of gas to the fuel cell is stopped and power generation is temporarily stopped while the vehicle is stopped such as waiting for a signal (Patent Literature). 1 and 2). When power generation is temporarily stopped, the cell voltage of each cell of the fuel cell decreases. If the cell voltage drops significantly, it becomes difficult to quickly return from intermittent operation to normal operation. Therefore, even during intermittent operation, the fuel cell is maintained so that each cell voltage is maintained at a predetermined value (standby voltage) or higher. A fuel gas and an oxidizing gas are supplied to the tank.

JP 2009-181809 A JP 2007-123020 A

  However, when the power generation is temporarily stopped as described above, the fuel gas concentration distribution is formed along the anode flow path. Specifically, the concentration in the vicinity of the center is lower than that in the vicinity of the inlet and the outlet of the anode channel. In this concentration distribution state, when the supply of the fuel gas and the oxidizing gas to the fuel cell is started to maintain the standby voltage of the cell voltage as described above, the cell voltage recovers, but the hydrogen concentration in the anode flow path In a low position, the catalyst-supported carbon such as platinum for the electrochemical reaction may be exposed to a high cell voltage potential to cause an irreversible carbon oxidation reaction. As a result, the electrochemical reaction catalyst deteriorates, and the performance of the fuel cell decreases.

  The present invention has been made in view of the above points, and an object of the present invention is to suppress deterioration of the performance of the fuel cell by suppressing deterioration of the catalyst of the electrochemical reaction when the power generation is temporarily stopped in the fuel cell. .

To achieve the above object, the present invention provides:
A fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when to supply the fuel gas and the oxidizing gas to the fuel cell, the cell voltage of the cell is lower than the threshold V1, which is set in advance, When the supply of the fuel gas to the fuel cell is started before the supply of the oxidizing gas and the supply of the fuel gas is started, when the cell voltage becomes lower than a preset threshold value V2 (V2 <V1), A fuel cell system having a gas supply control device for starting supply of oxidizing gas to a fuel cell

  According to the present invention, when the power generation of the fuel cell is temporarily stopped, the supply of the fuel gas is started before the supply of the oxidizing gas. The gas inside is agitated, and the concentration of the fuel gas in the anode channel can be made uniform. As a result, even if an oxidizing gas is supplied later to recover the cell voltage, the oxidation reaction of the catalyst-supported carbon does not occur. As a result, the deterioration of the electrochemical reaction catalyst is suppressed, and the performance of the fuel cell is reduced. Is suppressed.

  The fuel gas supply by the gas supply control device may be performed intermittently.

According to another aspect, the present invention provides:
A fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when raising the inlet pressure of the inlet pressure and cathode channel of the anode flow channel of the fuel cell, the cell voltage of the cell is set in advance a threshold value When it becomes lower than V1, the increase of the inlet pressure of the anode flow path is started before the increase of the inlet pressure of the cathode flow path, and after the increase of the inlet pressure of the anode flow path is started, the cell voltage is increased in advance. A fuel cell system comprising an inlet pressure control device that starts increasing the inlet pressure of the cathode flow path when the threshold voltage V2 (V2 <V1) becomes lower .

A control method for a fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when to supply the fuel gas and the oxidizing gas to the fuel cell, the cell voltage of the cell is lower than the threshold V1, which is set in advance, When the supply of the fuel gas to the fuel cell is started before the supply of the oxidizing gas and the supply of the fuel gas is started, when the cell voltage becomes lower than a preset threshold value V2 (V2 <V1), A control method for a fuel cell system, which starts supplying an oxidizing gas to a fuel cell.

A control method for a fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when raising the inlet pressure of the inlet pressure and cathode channel of the anode flow channel of the fuel cell, the cell voltage of the cell is set in advance a threshold value When it becomes lower than V1, the increase of the inlet pressure of the anode flow path is started before the increase of the inlet pressure of the cathode flow path, and after the increase of the inlet pressure of the anode flow path is started, the cell voltage is increased in advance. A control method for a fuel cell system , wherein when the pressure becomes lower than a set threshold value V2 (V2 <V1), an increase in the inlet pressure of the cathode channel is started .

  ADVANTAGE OF THE INVENTION According to this invention, degradation of the catalyst of the electrochemical reaction at the time of the electric power generation temporary stop in a fuel cell can be suppressed, and the fall of the performance of a fuel cell can be suppressed.

It is a schematic diagram which shows the structure of a fuel cell system. It is a perspective view of a fuel cell. It is a figure which shows the internal structure of a fuel cell. It is sectional drawing which shows the structure of a cell. It is a top view of a separator. It is a flowchart of the control method of a fuel cell system. It is a graph which shows the fluctuation | variation of the cell voltage at the time of intermittent operation, and the operation timing of a hydrogen gas pump and an air compressor. It is explanatory drawing which shows the dispersion | variation in the hydrogen gas concentration of an anode flow path. It is explanatory drawing which shows the hydrogen gas concentration of the anode flow path before and after supplying hydrogen gas. It is a graph which shows the operation timing of a hydrogen gas pump and an air compressor in the case of operating a hydrogen gas pump intermittently. It is a graph which shows the operation timing of a hydrogen gas pump and an air compressor in the case of operating a hydrogen gas pump from the time of an intermittent operation start. It is a graph which shows the inlet pressure timing of the anode flow path at the time of intermittent operation, and a cathode flow path. It is explanatory drawing which shows the hydrogen gas density | concentration of the anode flow path before raising the inlet pressure of an anode flow path, and after.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The fuel cell system 1 in the present embodiment is mounted on, for example, an automobile.

  For example, as shown in FIG. 1, the fuel cell system 1 includes a fuel cell 10 that generates power upon receiving supply of reaction gas (oxidizing gas and fuel gas), and an air pipe that supplies and exhausts air as oxidizing gas to the fuel cell 10 A system 11, a hydrogen gas piping system 12 for supplying and exhausting hydrogen gas as fuel gas to the fuel cell 10, a control device 13, and the like are included.

  The air piping system 11 has an air supply flow path 30 for supplying air to the fuel cell 10 and an air discharge flow path 31 for discharging the air that has passed through the fuel cell 10. The air supply flow path 30 is provided with an air compressor 40 that takes in air in the atmosphere and pumps it, a humidifier 41, and the like. The air discharge channel 31 is provided with a humidifier 41, a hydrogen diluter 42, and the like. By this air piping system 11, the air pressurized by the compressor 40 is sent to the humidifier 41, and the air humidified by the humidifier 41 is supplied to the fuel cell 10. The air that has passed through the fuel cell 10 is sent to the humidifier 41, then sent to the hydrogen diluter 42, and then discharged outside the system.

  The hydrogen gas piping system 12 includes a hydrogen tank 50 as a fuel supply source that stores high-pressure (for example, 70 MPa) hydrogen gas, and a hydrogen gas supply channel 51 for supplying the hydrogen gas in the hydrogen tank 50 to the fuel cell 10. A circulation channel 52 for returning the hydrogen off-gas discharged from the fuel cell 10 to the hydrogen gas supply channel 51 is provided.

  The hydrogen gas supply channel 51 has a regulator 60 for reducing the pressure of the hydrogen gas in the hydrogen tank 50 to a preset secondary pressure, and the flow rate and gas pressure of the hydrogen gas supplied to the fuel cell 10 are adjusted with high accuracy. An injector 61 or the like is provided.

  The circulation channel 52 includes, for example, a gas-liquid separator 70 that removes water and impurities from the hydrogen off-gas, a hydrogen gas pump 71 that pressurizes the hydrogen off-gas in the circulation channel 52 and pumps it to the hydrogen gas supply channel 51 side. Is provided. For example, the gas-liquid separator 70 is connected to a discharge flow path 72 that sends separated water and a part of the hydrogen off-gas to the hydrogen diluter 42. The discharge flow path 72 is provided with a discharge control valve 73 that controls the discharge of water and part of the hydrogen off-gas from the gas-liquid separator 70.

  Next, the fuel cell 10 will be described. As shown in FIGS. 2 and 3, the fuel cell 10 has a cell stack 81 formed by stacking a plurality of solid polymer electrolyte type single cells 80. On both ends of the cell stack 81, current collecting plates 82a and 82b, insulating plates 83a and 83b, and end plates 84a and 84b are arranged, respectively. The upper and lower tension plates 85 are bridged between the end plates 84a and 84b and fixed with bolts 86. An elastic module 87 is provided between the end plate 84b and the insulating plate 83b.

  In the cell stack 81, a plurality of manifolds 90 are formed so as to penetrate the single cells 80 in the stacking direction. The air manifold 90 is connected to the air supply channel 30 and the air discharge channel 31 through the supply port 91a and the exhaust port 91b of the end plate 84a. Further, the manifold 90 for hydrogen gas is connected to the hydrogen gas supply channel 51 and the circulation channel 52 through the supply port 92a and the exhaust port 92b of the end plate 84a. Further, the refrigerant manifold 90 is connected to a refrigerant supply passage and a refrigerant discharge passage (not shown) through the supply port 93a and the exhaust port 93b of the end plate 84a.

  As shown in FIG. 4, the single cell 80 includes an MEA 100 and a pair of separators 101A and 101B. The MEA 100 (membrane-electrode assembly) includes an electrolyte membrane 102 made of an ion exchange membrane, and an anode electrode 103 and a cathode electrode 104 sandwiching the electrolyte membrane 102. The anode electrode 103 faces the anode flow path 105 through which the hydrogen gas of the separator 101A flows, and the cathode electrode 104 faces the cathode flow path 106 through which the air of the separator 101B flows. Further, a coolant channel 107 is formed between the separators 101A and 101B of the adjacent single cells 80. Further, for example, the single cell 80 is provided with a voltmeter 108 for detecting the generated voltage of the cell 80.

  FIG. 5 is a plan view of the separator 101A. The separator 101 </ b> A is formed in a rectangular plate shape, and an inlet 110 and an outlet 111 of hydrogen gas constituting a part of the manifold 90 are formed at the diagonal. In the separator 101A, a groove-like cathode channel 105 leading from the inlet 110 to the outlet 111 is formed in a zigzag shape. As with the separator 101A, the separator 101B also has an air inlet and outlet that constitute a part of the manifold 90, and a cathode channel 106 that leads from the inlet to the outlet is formed in a zigzag shape.

  From the above configuration, the hydrogen gas supplied to the fuel cell 10 through the hydrogen gas supply flow channel 51 flows through the manifold 90 and flows into the anode flow channel 105 from the inlet 110 of the separator 101A of each cell 80 of the manifold 90 to the anode electrode. 103. The hydrogen off-gas that has passed through the anode channel 105 is discharged from the outlet 111 to the circulation channel 52 through the manifold 90. On the other hand, the air supplied to the fuel cell 10 through the air supply channel 30 flows through the manifold 90, flows into the cathode channel 106 from the inlet of the separator 101 </ b> B of each cell 80 of the manifold 90, and is supplied to the cathode electrode 104. . The air that has passed through the cathode channel 106 is discharged from the outlet of the cathode channel 106 to the air discharge channel 31 through the manifold 90. The hydrogen gas supplied to the anode electrode 103 and the air supplied to the cathode electrode 104 react electrochemically to generate electricity.

  The control device 13 is constituted by a CPU, a ROM, a RAM, and the like, and integrally controls each part of the system based on each sensor signal input. Specifically, the control device 13 calculates the required output power of the fuel cell 10 based on each sensor signal sent from a rotation speed detection sensor of an automobile, an accelerator pedal sensor that detects an accelerator pedal opening degree, or the like. Then, the control device 13 controls the air compressor 40 and the hydrogen gas pump 71 of the air piping system 11 and the hydrogen gas piping system 12 so as to generate output power corresponding to the output required power, and the output of the fuel cell 10. Controls voltage and output current.

  The control device 13 switches between the normal operation mode and the intermittent operation mode. The normal operation mode means an operation mode in which the fuel cell 10 continuously generates power for supplying power to a load device such as an automobile traction motor. The intermittent operation mode is, for example, temporarily stopping the power generation of the fuel cell 10 during low load operation such as idling, low speed running, regenerative braking, etc., and supplying power from the battery to the load device, The fuel cell 10 means an operation mode in which hydrogen gas and air that can maintain an open-ended voltage are intermittently supplied. The intermittent operation mode corresponds to “when the power generation of the fuel cell is temporarily stopped” in the present invention.

  Further, in the intermittent operation mode, the control device 13 can measure the voltage of the cell 80 with the voltmeter 108 and supply hydrogen gas and air to the fuel cell 10 based on the measured voltage. The control device 13 functions as a gas supply control device in the present invention.

  Next, a control method of the fuel cell system 1 configured as described above will be described. In the present embodiment, when supplying hydrogen gas and air to the fuel cell 10 in the intermittent operation mode, the supply of hydrogen gas is started before the supply of air. FIG. 6 is a flowchart showing an example of a control method of the fuel cell system 1.

  First, when a predetermined condition such as the vehicle accelerator is in an OFF state is satisfied, the normal operation mode is shifted to the intermittent operation mode, and the intermittent operation is started. At this time, the hydrogen gas pump 71 for supplying hydrogen gas to the fuel cell 10 and the air compressor 40 for supplying air are stopped. Thereafter, it is confirmed whether or not the successive intermittent operation is continued. For example, when the accelerator is turned on, the intermittent operation is stopped, and when the accelerator is kept off, the intermittent operation is continued. . When the intermittent operation is continued, for example, as shown in FIG. 7, the cell voltage Vc of the cell 80 of the fuel cell 10 decreases. Even during the intermittent operation, the cell voltage Vc needs to be maintained at the standby voltage V0 or higher so that the normal operation can be quickly returned. Further, when the power generation stop state continues in the intermittent operation, as shown in FIG. 8, the hydrogen concentration in the central portion of the anode flow path 105 of the anode electrode 103 decreases, and the hydrogen concentration in the anode flow path 105 varies.

  When the intermittent operation continues and the cell voltage Vc shown in FIG. 7 becomes lower than a preset threshold value V1 (V1 <standby voltage V0), the hydrogen gas pump 71 is operated, and the supply of hydrogen gas to the fuel cell 10 is performed. Be started. As a result, as shown in FIG. 9, there is no variation in the hydrogen concentration in the anode channel 105 of the anode electrode 103. Specifically, the concentration of hydrogen gas that has been reduced near the center of the anode channel 105 is recovered. On the other hand, while the cell voltage Vc exceeds the threshold value V1, the supply of hydrogen gas is not started, and the process returns to the determination as to whether or not the intermittent operation is continued as shown in FIG. The cell voltage Vc measured by the voltmeter 108 is used.

  When the supply of hydrogen gas is started and the cell voltage Vc becomes lower than a preset threshold value V2 (V2 <V1) as shown in FIG. 7, the air compressor 40 operates and the supply of air to the fuel cell 10 is performed. Is started. Thereby, the cell voltage Vc is recovered. On the other hand, while the cell voltage Vc exceeds the threshold value V2, the supply of air is not started, and the process returns to the determination of whether or not the intermittent operation is continued.

  When the cell voltage Vc recovers and becomes higher than the standby voltage V0, the hydrogen gas pump 71 and the air compressor 40 are stopped, and the supply of hydrogen gas and air is stopped. When the supply of hydrogen gas and air is stopped, the process returns to the determination of whether or not the intermittent operation is continued. Also, when the cell voltage Vc is not higher than the standby voltage V0, the process returns to the determination of whether or not the intermittent operation is continued.

  According to the present embodiment, in the intermittent operation, when supplying hydrogen gas and air to the fuel cell 10 in order to maintain the cell voltage Vc at the standby voltage V0 or higher, the supply of the hydrogen gas is performed before the supply of air. Has started. Thereby, the gas in the anode flow path 105 of the anode electrode 103 is stirred first, and the hydrogen gas concentration in the anode flow path 105 can be made uniform. As a result, even if air is supplied later to recover the cell voltage Vc, the oxidation reaction of the catalyst-supporting carbon does not occur, and as a result, the deterioration of the catalyst of the electrochemical reaction is suppressed, and the performance of the fuel cell 10 is reduced. Is suppressed.

  In the present embodiment, the supply of hydrogen gas and air during the intermittent operation is performed when the cell voltage Vc of the fuel cell 10 is maintained at the standby voltage V0 or higher, so that the switching from the intermittent operation to the normal operation can be performed quickly and Can be done appropriately.

  In the above-described embodiment, as shown in FIG. 10, the supply of hydrogen gas during intermittent operation may be intermittently performed. In such a case, the hydrogen gas pump 71 is turned on and off at a predetermined duty ratio. Thereby, the power loss of the hydrogen gas pump 71 can be suppressed.

  Further, in the above embodiment, the supply of hydrogen gas is started after the cell voltage Vc is lowered from the predetermined threshold value V1, but it may be performed from the start of the intermittent operation. In this case, for example, as shown in FIG. 11, the hydrogen gas pump 71 may be turned on and off at a predetermined duty ratio to supply the hydrogen gas, or the hydrogen gas may be continuously supplied.

  In the above embodiment, hydrogen gas and air are supplied in order to maintain the cell voltage Vc at the standby voltage V0 or higher, but instead, the anode channel 105 on the anode electrode 103 side of the fuel cell 10 is supplied. The inlet pressure and the inlet pressure of the cathode channel 106 on the cathode electrode 104 side may be increased. In this case, the control device 13 increases the inlet pressure of the anode channel 105 to increase the inlet pressure of the cathode channel 106. You may make it start earlier. At this time, the control device 13 functions as an inlet pressure control device in the present invention.

  For example, when the cell voltage Vc shown in FIG. 12 becomes lower than a preset threshold value V1 'during intermittent operation, the inlet pressure of the anode flow path 105 on the anode electrode 103 side is increased. Thereby, as shown in FIG. 13, the variation in the hydrogen concentration in the anode channel 105 is reduced. Further, when the cell voltage Vc becomes lower than a preset threshold value V2 ', the inlet pressure of the cathode channel 106 of the cathode electrode 104 is increased. Thereby, the cell voltage Vc is recovered. When the cell voltage Vc becomes higher than the standby voltage V0, the increase in the inlet pressure of the anode channel 105 and the inlet pressure of the cathode channel 106 is stopped.

  Also in this example, in the intermittent operation, the inlet pressure of the anode channel 105 on the anode electrode 103 side of the fuel cell 10 and the inlet of the cathode channel 106 on the cathode electrode 104 side in order to maintain the cell voltage Vc at the standby voltage V0 or higher. In the case of increasing the pressure, the increase in the inlet pressure of the anode channel 105 is started before the increase in the inlet pressure of the cathode channel 106. Thereby, first, the concentration of the hydrogen gas in the anode flow path 105 of the anode electrode 103 can be made uniform. Therefore, even if the inlet pressure of the cathode channel 106 is increased later for recovery of the cell voltage Vc, the oxidation reaction of the catalyst-supporting carbon does not occur, and as a result, the deterioration of the catalyst of the electrochemical reaction is suppressed, and the fuel The performance degradation of the battery 10 is suppressed.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the fuel cell system according to the present invention can be mounted on various moving bodies such as vehicles, ships, airplanes, and robots, and can also be applied to stationary power sources. Further, the fuel gas and the oxidizing gas used in the fuel cell are not limited to hydrogen gas and air, and may be other gases. In the above embodiment, the supply of hydrogen gas and air during the intermittent operation is performed when the cell voltage Vc of the fuel cell 10 is maintained at the standby voltage V0 or higher. The present invention can also be applied when air is supplied.

  INDUSTRIAL APPLICABILITY The present invention is useful in suppressing deterioration of the performance of a fuel cell by suppressing deterioration of a catalyst for an electrochemical reaction when power generation is temporarily stopped in the fuel cell.

DESCRIPTION OF SYMBOLS 1 Fuel cell system 10 Fuel cell 13 Control apparatus 40 Air compressor 71 Hydrogen gas pump 80 Cell 103 Anode electrode 104 Cathode electrode 105 Anode flow path 106 Cathode flow path

Claims (5)

A fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when to supply the fuel gas and the oxidizing gas to the fuel cell, the cell voltage of the cell is lower than the threshold V1, which is set in advance, When the supply of the fuel gas to the fuel cell is started before the supply of the oxidizing gas and the supply of the fuel gas is started, when the cell voltage becomes lower than a preset threshold value V2 (V2 <V1), A fuel cell system having a gas supply control device for starting supply of oxidizing gas to a fuel cell. The fuel cell system according to claim 1, wherein the supply of the fuel gas by the gas supply control device is performed intermittently. A fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when raising the inlet pressure of the inlet pressure and cathode channel of the anode flow channel of the fuel cell, the cell voltage of the cell is set in advance a threshold value When it becomes lower than V1, the increase of the inlet pressure of the anode flow path is started before the increase of the inlet pressure of the cathode flow path, and after the increase of the inlet pressure of the anode flow path is started, the cell voltage is increased in advance. A fuel cell system comprising an inlet pressure control device that starts increasing the inlet pressure of the cathode flow path when the threshold voltage V2 (V2 <V1) becomes lower . A control method for a fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when to supply the fuel gas and the oxidizing gas to the fuel cell, the cell voltage of the cell is lower than the threshold V1, which is set in advance, When the supply of the fuel gas to the fuel cell is started before the supply of the oxidizing gas and the supply of the fuel gas is started, when the cell voltage becomes lower than a preset threshold value V2 (V2 <V1), A control method for a fuel cell system, which starts supplying an oxidizing gas to a fuel cell. A control method for a fuel cell system for generating power by supplying a fuel gas and an oxidizing gas to a fuel cell comprising a plurality of cells and causing an electrochemical reaction between the fuel gas and the oxidizing gas,
When you are temporarily stopped power generation of the fuel cell, when raising the inlet pressure of the inlet pressure and cathode channel of the anode flow channel of the fuel cell, the cell voltage of the cell is set in advance a threshold value When it becomes lower than V1, the increase of the inlet pressure of the anode flow path is started before the increase of the inlet pressure of the cathode flow path, and after the increase of the inlet pressure of the anode flow path is started, the cell voltage is increased in advance. A control method for a fuel cell system , wherein when the pressure becomes lower than a set threshold value V2 (V2 <V1), an increase in the inlet pressure of the cathode channel is started .

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