JP2010040250A - Fuel cell system and starting method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to speedily and efficiently carry out substitution of anode gas at start-up in a simple control. <P>SOLUTION: The fuel cell system 10 includes a fuel cell stack 12; an anode gas supply mechanism 16 supplying fuel gas to the fuel cell stack 12; an anode gas supply valve 54, fitted to the anode gas supply mechanism 16 for controlling supply of the fuel gas to an anode gas flow channel 34; an anode purge valve 64 for exhausting residue gas guided out of the anode gas flow channel 34; and a controller 18 for making the anode purge valve 64 open before opening of the anode gas supply valve 54, when gas pressure of the anode gas flow channel 34 detected by a pressure detector 66 is determined as being positive, with the anode gas supply valve 54 in an opened state at the start of the fuel cell system 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel cell system including a fuel cell that supplies an anode gas to an anode gas flow channel and supplies a cathode gas to a cathode gas flow channel to generate electric power, and a starting method thereof.

  A fuel cell supplies a fuel gas (a gas mainly containing hydrogen, for example, hydrogen gas) and an oxidant gas (a gas mainly containing oxygen, for example, air) to an anode side electrode and a cathode side electrode for electricity. It is a system that obtains direct-current electrical energy through chemical reaction.

  For example, a polymer electrolyte fuel cell includes a power generation cell in which an electrolyte membrane / electrode structure provided with an anode side electrode and a cathode side electrode is sandwiched between separators on both sides of an electrolyte membrane made of a polymer ion exchange membrane. ing. This type of power generation cell is normally used as a fuel cell stack by alternately laminating a predetermined number of electrolyte membrane / electrode structures and separators.

  In this type of fuel cell, when power generation (operation) is stopped, an impure gas such as an oxidant gas enters the anode side electrode as the stop time elapses, and the hydrogen concentration on the anode side electrode side decreases. There is a problem.

  Therefore, for example, as disclosed in Patent Document 1, before starting the power generation in the fuel cell system, the impure gas staying inside the system while it is left is efficiently removed and replaced with high-concentration hydrogen. Thus, there is known a hydrogen purge method at the time of starting the fuel cell system that can smoothly start the fuel cell system.

  The hydrogen purge method includes a step of detecting a fuel cell start signal, and a step of detecting a pressure of the hydrogen electrode before being supplied from the hydrogen tank to the hydrogen electrode of the fuel cell after detecting the fuel cell start signal. And the opening start time from the opening of the hydrogen shutoff valve disposed between the hydrogen tank and the hydrogen electrode of the fuel cell to the opening of the hydrogen purge valve, and the detected pressure of the hydrogen electrode A step of opening the hydrogen cutoff valve, a step of determining whether or not the valve opening start time has elapsed after opening the hydrogen cutoff valve, and the valve opening start time. And after maintaining that the hydrogen purge valve is kept open for a predetermined time.

  Further, the hydrogen purging method includes a step of detecting a start signal of the fuel cell and, after detecting the start signal of the fuel cell, opening a hydrogen shut-off valve disposed between the hydrogen tank and the hydrogen electrode of the fuel cell. A step of detecting, a step of detecting a pressure of the hydrogen electrode, a step of determining whether or not the detected pressure of the hydrogen electrode is equal to or higher than a predetermined value, and a pressure of the detected hydrogen electrode being equal to or higher than a predetermined value And a step of holding the hydrogen purge valve in a valve open state for a predetermined time after the determination.

JP 2007-128902 A

  By the way, in the above Patent Document 1, when the fuel cell is started, the hydrogen shut-off valve is opened to supply hydrogen to the hydrogen electrode (anode side electrode), and after the set valve opening start time has elapsed, After the electrode pressure is increased to a predetermined value or higher, the hydrogen purge valve is opened. For this reason, the hydrogen electrode contains a relatively large amount of mixed gas of hydrogen and residual gas, and when the hydrogen purge valve is opened and gas replacement is performed, the time required for hydrogen replacement is long. There is a risk.

  An object of the present invention is to solve this kind of problem, and to provide a fuel cell system capable of quickly and efficiently replacing an anode gas at start-up with simple control, and a start-up method thereof. And

  The fuel cell system according to the present invention supplies an anode gas to the anode gas flow channel, supplies a cathode gas to the cathode gas flow channel to generate power, and supplies the anode gas to the anode gas flow channel. An anode gas supply mechanism, an anode gas supply valve which is provided in the anode gas supply mechanism and controls the supply of the anode gas to the anode gas flow path, and the anode gas derived from the anode gas flow path An anode purge valve that discharges outside the anode gas path, an anode gas pressure detection mechanism that directly or indirectly detects the gas pressure in the anode gas flow path, and the anode gas supply valve is closed when the fuel cell system is started. In this state, the gas pressure in the anode gas flow path detected by the anode gas pressure detection mechanism is a positive pressure. When it is determined that, and a control mechanism for opening the anode purge valve before opening of the anode gas supply valve.

  In addition, the control mechanism opens the anode gas supply valve when the gas pressure in the anode gas flow path detected by the anode gas pressure detection mechanism is negative, and opens the gas pressure in the anode gas flow path. The anode purge valve is preferably opened after the pressure becomes positive.

  The fuel cell system further includes an anode scavenging mechanism, and the control mechanism opens the anode gas supply valve when the fuel cell system is started when scavenging by the anode scavenging mechanism is performed while the fuel cell system is stopped. It is preferable to open the anode purge valve before the valve.

  Furthermore, the fuel cell system activation method according to the present invention includes a step of detecting the gas pressure in the anode gas flow path by the anode gas pressure detection mechanism with the anode gas supply valve closed when the fuel cell system is activated. And a step of opening the anode purge valve before opening the anode gas supply valve when it is determined that the detected gas pressure in the anode gas flow path is a positive pressure.

  The starting method includes a step of opening an anode gas supply valve when the gas pressure in the anode gas flow path detected by the anode gas pressure detection mechanism is negative, and the anode gas flow path It is preferable to include a step of opening the anode purge valve after the gas pressure in the anode gas flow path becomes positive by supplying the anode gas.

  The fuel cell system further includes an anode scavenging mechanism. When scavenging by the anode scavenging mechanism is performed while the fuel cell system is stopped, an anode purge is performed before the anode gas supply valve is opened when the fuel cell system is started. It is preferable to open the valve.

  In the present invention, when it is determined that the gas pressure in the anode gas flow path is positive when the fuel cell system is started, the anode purge valve is opened before the anode gas supply valve is opened. Residual gas in the flow path can be purged. This is because the atmosphere in the anode gas flow path does not flow backward even when the anode purge valve is opened because the anode gas flow path has a positive pressure.

  Therefore, after the residual gas in the anode gas channel is discharged under the opening action of the anode purge valve, the anode gas supply valve is opened and the anode gas is supplied to the anode gas channel. As a result, the anode gas concentration in the anode gas flow path quickly increases, so that the anode gas can be replaced quickly and efficiently at start-up with simple control, and the start-up time can be easily reduced. It becomes possible to plan.

  FIG. 1 is a schematic configuration diagram of a fuel cell system 10 to which a startup method according to the first embodiment of the present invention is applied.

  The fuel cell system 10 includes a fuel cell stack 12, a cathode gas supply mechanism 14 for supplying an oxidant gas to the fuel cell stack 12, an anode gas supply mechanism 16 for supplying a fuel gas to the fuel cell stack 12, And a controller (control mechanism) 18 that controls the entire fuel cell system 10.

  The fuel cell stack 12 is configured by stacking a plurality of fuel cells 20. Each fuel cell 20 includes, for example, an electrolyte membrane / electrode structure 28 in which a solid polymer electrolyte membrane 22 in which a perfluorosulfonic acid thin film is impregnated with water is sandwiched between a cathode side electrode 24 and an anode side electrode 26. The electrolyte membrane / electrode structure 28 is sandwiched between a pair of separators 30a and 30b.

  The cathode side electrode 24 and the anode side electrode 26 are uniformly coated on the surface of the gas diffusion layer with a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying platinum alloy on the surface. An electrode catalyst layer (not shown). The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 22.

  Between the electrolyte membrane / electrode structure 28 and the separator 30a, a cathode gas channel 32 for supplying an oxidant gas to the cathode electrode 24 is formed, and the electrolyte membrane / electrode structure 28 and the separator 30b In the meantime, an anode gas flow path 34 for supplying fuel gas to the anode electrode 26 is formed.

  At one end of the fuel cell stack 12 in the stacking direction, an oxidant gas inlet communication hole 36a for supplying an oxidant gas such as air (oxygen-containing gas) to the cathode gas flow path 32, and the oxidant gas is supplied to the cathode. An oxidant gas outlet communication hole 36b for discharging from the gas flow path 32 is provided. At the other end of the fuel cell stack 12 in the stacking direction, a fuel gas inlet communication hole 38 a for supplying a fuel gas such as a hydrogen-containing gas to the anode gas flow path 34 and the fuel gas from the anode gas flow path 34 are provided. A fuel gas outlet communication hole 38b for discharging is formed. In the fuel cell stack 12, a cooling medium flow path (not shown) is provided for flowing a cooling medium between the fuel cells 20 or for each of the plurality of fuel cells 20.

  The cathode gas supply mechanism 14 includes an air compressor 40 that compresses and supplies air from the atmosphere, and the air compressor 40 is disposed in the air supply flow path 42. The air supply channel 42 communicates with the oxidant gas inlet communication hole 36 a of the fuel cell stack 12.

  The cathode gas supply mechanism 14 includes an air discharge channel 44 that communicates with the oxidant gas outlet communication hole 36b. The air discharge passage 44 has a valve (back pressure control valve) 46 with an adjustable opening for adjusting the pressure of air supplied from the air compressor 40 through the air supply passage 42 to the fuel cell stack 12. Is provided. The air discharge channel 44 is connected to the dilution box 48.

  The anode gas supply mechanism 16 includes a hydrogen tank 50 that stores high-pressure hydrogen (hydrogen-containing gas). The hydrogen tank 50 communicates with the fuel gas inlet communication hole 38 a of the fuel cell stack 12 via the hydrogen supply flow path 52. To do. The hydrogen supply channel 52 is provided with an anode gas supply valve (shutoff valve) 54 and an ejector 56.

  An off gas passage 58 communicates with the fuel gas outlet communication hole 38b. A hydrogen circulation path 60 and a purge flow path 62 communicate with the off-gas flow path 58, and the hydrogen circulation path 60 communicates with an ejector 56. The purge flow path 62 is connected to the dilution box 48 via the anode purge valve 64.

  The ejector 56 supplies the hydrogen gas supplied from the hydrogen tank 50 to the fuel cell stack 12 through the hydrogen supply flow path 52, and exhaust gas containing unused hydrogen gas that has not been used in the fuel cell stack 12. Then, the gas is sucked from the hydrogen circulation path 60 and supplied again as fuel gas to the fuel cell stack 12. The off-gas channel 58 is provided with an anode gas pressure detection mechanism that directly detects the gas pressure in the anode gas channel 34, for example, a pressure detector 66.

  The operation of the fuel cell system 10 configured as described above will be described below along the flowchart shown in FIG. 2 in relation to the activation method according to the first embodiment of the present invention.

  First, when an ignition (not shown) is turned on to start the fuel cell system 10 (step S1), the process proceeds to step S2, and the anode gas pressure in the anode gas flow path 34 is changed to a pressure detector 66. Detected directly. In the controller 18, the detected anode gas pressure in the anode gas flow path 34 is compared with the atmospheric pressure (step S3).

  When it is determined that the detected anode gas pressure is higher than atmospheric pressure, that is, positive pressure (more preferably, positive pressure + predetermined value α) (YES in step S3), FIG. 3 shows. The processing after step S4 is performed along the timing chart. The predetermined value α is preferably set to a pressure that can prevent air from being sucked in from the atmosphere as much as possible when the anode purge is performed.

  Therefore, the anode purge valve 64 is opened with the anode gas supply valve 54 closed (step S4). For this reason, in the fuel cell stack 12, residual gas (hydrogen, air, etc.) remaining in each anode gas flow channel 34 flows from the off gas flow channel 58 to the anode gas due to a pressure difference between the anode gas flow channel 34 and atmospheric pressure. It is discharged to the dilution box 48 via the purge flow path 62 that is outside the path.

  Proceeding to step S5, it is determined whether or not a predetermined amount of anode purge has been completed based on the elapsed time since the anode purge valve 64 was opened, the flow rate of the exhaust gas flowing through the purge passage 62, and the like (step S5). S5). When the predetermined amount of anode purge is completed (YES in step S5), the process proceeds to step S6, and the anode purge valve 64 is closed.

  Next, in step S7, it is determined that the anode gas supply valve 54 is closed (YES in step S7), the process proceeds to step S8, and the anode gas supply valve 54 is opened. Therefore, in the fuel cell stack 12, hydrogen is supplied from the hydrogen tank 50 to each anode gas flow path 34, and hydrogen gas replacement is performed. Thereafter, the process proceeds to step S9, and the OCV check of the fuel cell stack 12 is performed.

  On the other hand, when it is determined in step S3 that the anode gas pressure in the anode gas flow path 34 is less than atmospheric pressure (NO in step S3), the steps after step S10 are performed in accordance with the timing chart shown in FIG. Processing is performed.

  In step S10, the anode gas supply valve 54 is opened before the anode purge valve 64 is opened. Therefore, hydrogen gas is supplied from the hydrogen tank 50 to the anode gas flow path 34 in the fuel cell stack 12 via the hydrogen supply flow path 52, and the gas pressure in the anode gas flow path 34 is increased.

  When it is determined that the anode gas pressure in the anode gas flow path 34 is higher than the atmospheric pressure (YES in step S11), the process proceeds to step S4, and the anode purge valve 64 is opened. Therefore, the anode gas flow path 34 can prevent the backflow of air from the atmosphere, and the residual gas in the anode gas flow path 34 is reliably discharged to the dilution box 48 via the purge flow path 62. .

  In this case, in the first embodiment, when it is determined that the gas pressure in the anode gas flow path 34 is positive at the time of starting the fuel cell system 10 (step S3), before the anode gas supply valve 54 is opened. In addition, the anode purge valve 64 is opened. For this reason, before the supply of hydrogen gas to the fuel cell stack 12 is started, the residual gas in the anode gas flow path 34 can be reliably and rapidly discharged.

  Therefore, when the pressure in the anode gas flow path 34 is not negative, that is, when there is no back flow of the atmosphere, first, the residual gas in the anode gas flow path 34 is discharged under the opening action of the anode purge valve 64. After that, the anode gas supply valve 54 is opened. As a result, the anode gas concentration in the anode gas flow path 34 can be quickly increased, and hydrogen gas replacement at start-up can be performed quickly and efficiently with simple control, thereby shortening the start-up time. It is possible to easily achieve the effect.

  On the other hand, when it is determined in step S3 that the anode gas pressure in the anode gas flow path 34 is negative, first, the anode gas supply valve 54 is opened and the anode gas pressure becomes positive. Thereafter, the anode purge valve 64 is opened. For this reason, when the inside of the anode gas flow path 34 has a negative pressure, it is possible to reliably prevent the air in the atmosphere from flowing backward through the anode gas flow path 34.

  FIG. 5 is a schematic configuration diagram of a fuel cell system 70 to which the activation method according to the second embodiment of the present invention is applied. The same components as those of the fuel cell system 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The fuel cell system 70 includes a timer 72 as an anode gas pressure detection mechanism that indirectly detects the anode gas pressure in the anode gas flow path 34, and this timer 72 is connected to the controller 18. The timer 72 measures the time during which the fuel cell system 70 is stopped.

  That is, as time elapses after the fuel cell system 70 is stopped, for example, residual hydrogen in the anode gas channel 34 permeates through the solid polymer electrolyte membrane 22 and leaks into the cathode gas channel 32 to react. As a result, the gas pressure in the anode gas flow path 34 decreases. For this reason, the gas pressure in the anode gas flow path 34 falls below the atmospheric pressure depending on the elapsed time after the stop, and the elapsed time in which the anode gas flow path 34 becomes negative is set as the set time.

  In the second embodiment, the fuel cell system 70 is activated according to the flowchart shown in FIG. Specifically, in the fuel cell system 70, after an ignition (not shown) is turned on (step S21), the process proceeds to step S22, and an elapsed time after the fuel cell system 70 is stopped (hereinafter referred to as a stop time). ) Is detected via the timer 72.

  If it is determined that the stop time is shorter than the set time (YES in step S23), it is estimated that the anode gas pressure in the anode gas flow path 34 is equal to or higher than atmospheric pressure, that is, a positive pressure, and step S24. Then, the anode purge valve 64 is opened. Hereinafter, the processing of step S25 to step S29 is performed similarly to step S5 to step S9 in the first embodiment.

  On the other hand, if it is determined in step S23 that the stop time of the fuel cell system 70 exceeds the set time (NO in step S23), the process proceeds to step S30, and prior to opening the anode purge valve 64. The anode gas supply valve 54 is opened. Accordingly, the hydrogen gas in the hydrogen tank 50 is supplied to the anode gas channel 34 and the anode gas pressure in the anode gas channel 34 is increased. When it is determined that hydrogen gas has been supplied for a predetermined time (the anode gas pressure in the anode gas passage 34 has reached atmospheric pressure or higher) (YES in step S31), the process proceeds to step S24. Processing similar to the above is performed.

  As described above, in the second embodiment, when it is determined that the anode gas flow path 34 is at a positive pressure based on the stop time of the fuel cell system 70, the anode gas supply valve 54 is opened before the valve is opened. The anode purge valve 64 is opened. As a result, the anode gas concentration in the anode gas flow path 34 can be quickly increased, and the start-up time can be shortened. For example, the same effects as in the first embodiment can be obtained. .

  FIG. 7 is a schematic configuration diagram of a fuel cell system 80 to which the startup method according to the third embodiment of the present invention is applied.

  The fuel cell system 80 includes an anode scavenging mechanism 82. The anode scavenging mechanism 82 includes an anode scavenging flow path 84 that is connected at both ends to the air supply flow path 42 and the hydrogen supply flow path 52 and bypasses the fuel cell stack 12. A valve 86 is provided.

  In the third embodiment configured as described above, the activation process is performed according to the flowchart shown in FIG.

  In the fuel cell system 80, after the ignition is turned on (step S41), the anode gas pressure in the anode gas flow path 34 is detected (step S42). Then, the process proceeds to step S43, and it is determined whether anode scavenging has been performed while the fuel cell system 80 is stopped.

  In the anode scavenging, air is introduced into the anode scavenging flow path 84 by driving the air compressor 40 in a state where the on-off valve 86 constituting the anode scavenging mechanism 82 is opened. The anode scavenging flow path 84 is connected to the hydrogen supply flow path 52, and when the air is supplied from the hydrogen supply flow path 52 to the anode gas flow path 34, the anode gas flow path 34 is made of scavenging gas. Replaced with some air.

  Therefore, when it is determined in step S43 that the stopped anode scavenging is not performed in the fuel cell system 80 (YES in step S43), the process proceeds to step S44, and the anode gas in the anode gas flow path 34 is obtained. It is determined whether or not the pressure is positive. Subsequently, the process of step S45-step S50 is performed similarly to step S4-step S9 in 1st Embodiment.

  On the other hand, if it is determined in step S43 that the anode scavenging has been performed while the fuel cell system 80 is stopped (NO in step S43), the anode gas flow path 34 is at a positive pressure because it is replaced with air. It is judged. Thereby, the anode purge valve 64 is opened (step S45), and the hydrogen gas replacement process of the anode gas flow path 34 is performed quickly and satisfactorily.

  Further, when it is determined in step S44 that the anode gas pressure in the anode gas flow path 34 is negative (NO in step S44), the process proceeds to step S51 and subsequent steps, and then step S10 and subsequent steps of the first embodiment. The same processing is performed.

  As described above, in the third embodiment, when it is determined that the anode gas flow path 34 is subjected to the anode scavenging process while the fuel cell system 80 is stopped, the inside of the anode gas flow path 34 is positively pressurized. As a result, the anode purge valve 64 is opened before the anode gas supply valve 54 is opened. Therefore, in the third embodiment, the same effect as in the first and second embodiments can be obtained.

1 is a schematic configuration diagram of a fuel cell system to which a startup method according to a first embodiment of the present invention is applied. It is a flowchart explaining the said starting method. It is a timing chart when an anode gas channel is positive pressure. It is a timing chart when an anode gas channel is negative pressure. It is a schematic block diagram of the fuel cell system with which the starting method which concerns on the 2nd Embodiment of this invention is applied. It is a flowchart explaining the said starting method. It is a schematic block diagram of the fuel cell system with which the starting method which concerns on the 3rd Embodiment of this invention is applied. It is a flowchart explaining the said starting method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 70, 80 ... Fuel cell system 12 ... Fuel cell stack 14 ... Cathode gas supply mechanism 16 ... Anode gas supply mechanism 18 ... Controller 20 ... Fuel cell 22 ... Solid polymer electrolyte membrane 24 ... Cathode side electrode 26 ... Anode side electrode 28 ... Electrolyte membrane / electrode structure 30a, 30b ... Separator 32 ... Cathode gas channel 34 ... Anode gas channel 40 ... Air compressor 42 ... Air supply channel 44 ... Air discharge channel 46 ... Valve 48 ... Dilution box 50 ... Hydrogen tank 52 ... Hydrogen supply flow path 54 ... Anode gas supply valve 56 ... Ejector 58 ... Off gas flow path 60 ... Hydrogen circulation path 62 ... Purge flow path 64 ... Anode purge valve 72 ... Timer 82 ... Anode scavenging mechanism

Claims (6)

A fuel cell that supplies an anode gas to the anode gas flow path and supplies a cathode gas to the cathode gas flow path to generate power;
An anode gas supply mechanism for supplying the anode gas to the anode gas flow path;
An anode gas supply valve that is provided in the anode gas supply mechanism and controls the supply of the anode gas to the anode gas flow path;
An anode purge valve for discharging the anode gas derived from the anode gas flow path out of the anode gas path;
An anode gas pressure detection mechanism for directly or indirectly detecting the gas pressure of the anode gas flow path;
When it is determined that the gas pressure in the anode gas flow path detected by the anode gas pressure detection mechanism is positive while the anode gas supply valve is closed at the time of starting the fuel cell system, the anode A control mechanism for opening the anode purge valve before opening the gas supply valve;
A fuel cell system comprising:   2. The fuel cell system according to claim 1, wherein when the control mechanism determines that the gas pressure in the anode gas flow path detected by the anode gas pressure detection mechanism is negative, the control mechanism controls the anode gas supply valve. A fuel cell system, wherein the anode purge valve is opened after the valve is opened and the gas pressure in the anode gas passage becomes positive. The fuel cell system according to claim 1 or 2, further comprising an anode scavenging mechanism,
The control mechanism opens the anode purge valve before opening the anode gas supply valve when the fuel cell system is started when scavenging by the anode scavenging mechanism is performed while the fuel cell system is stopped. A fuel cell system. A fuel cell that supplies an anode gas to the anode gas flow path and supplies a cathode gas to the cathode gas flow path to generate power;
An anode gas supply mechanism for supplying the anode gas to the anode gas flow path;
An anode gas supply valve that is provided in the anode gas supply mechanism and controls the supply of the anode gas to the anode gas flow path;
An anode purge valve for discharging the anode gas derived from the anode gas flow path out of the anode gas path;
An anode gas pressure detection mechanism for directly or indirectly detecting the gas pressure in the anode gas flow path;
A method for starting a fuel cell system comprising:
Detecting the gas pressure in the anode gas flow path by the anode gas pressure detection mechanism with the anode gas supply valve closed at the time of starting the fuel cell system;
Opening the anode purge valve before opening the anode gas supply valve when it is determined that the detected gas pressure in the anode gas flow path is a positive pressure; and
A starting method for a fuel cell system, comprising: The starting method according to claim 4, wherein when the gas pressure in the anode gas flow path detected by the anode gas pressure detection mechanism is determined to be negative, the anode gas supply valve is opened.
A step of opening the anode purge valve after the gas pressure in the anode gas channel becomes positive by supplying the anode gas to the anode gas channel;
A starting method for a fuel cell system, comprising: 6. The startup method according to claim 4, wherein the fuel cell system includes an anode scavenging mechanism,
When scavenging by the anode scavenging mechanism is performed while the fuel cell system is stopped, the anode purge valve is opened before the anode gas supply valve is opened when the fuel cell system is started. How to start the battery system.

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