JP2008190699A - Fuel cell system and fuel gas tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the discharge of a hydrogen gas with high concentration from a fuel gas tank of double layer structure including a resin layer. <P>SOLUTION: This fuel gas tank filled with a fuel gas comprises the resin layer 111 formed of a material having a permeability against the fuel gas and a reinforcement layer 112 formed, outside the resin layer 111, of a material with a permeability against the fuel gas lower than that of the resin layer. Openings 13 penetrating in the thickness direction are formed in the reinforcement layer 112. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell system that generates power by an electrochemical reaction between a fuel gas and an oxidizing gas, and a fuel gas tank filled with hydrogen gas as a fuel gas in the fuel cell system.

  In recent years, as an energy generation system, for example, a fuel cell system using a fuel cell that generates power by an electrochemical reaction between a fuel gas and an oxidizing gas (hereinafter referred to as a reaction gas) has attracted attention. For example, hydrogen gas is used as the fuel gas, and air is used as the oxidizing gas, for example. In addition, development of a fuel cell vehicle in which such a fuel cell system is mounted on a vehicle is also in progress.

  In a vehicle fuel cell system, it is important to reduce the weight of the system. Therefore, various measures for reducing the weight of the fuel gas tank filled with hydrogen gas used as the fuel gas, such as using a resin material, have been made.

  Recently, a gas tank having a multilayer structure in which a liner (inner container) is molded from a resin material and a metal material is disposed around the liner to improve the strength has been manufactured. Alternatively, the strength may be improved by winding a fiber reinforced resin obtained by impregnating carbon fiber or glass fiber with a resin around the liner.

  Such a fuel gas tank is usually mounted with a plurality of relatively small ones instead of mounting one large-capacity tank due to restrictions on the mounting space on the vehicle. Further, in order to extend the cruising distance of the vehicle, the fuel gas tank is increased in pressure (for example, the pressure is set to 70 MPa).

  By the way, in general, gas permeates various materials, but hydrogen has very high permeability among them. Therefore, when hydrogen gas is filled in the gas tank, the hydrogen gas that has permeated through the wall of the tank body is constantly released in a small amount. In particular, in a high-pressure gas tank, hydrogen gas is more easily transmitted.

  However, in a gas tank having a multi-layer structure, the resin layer as the liner portion is relatively easy to permeate hydrogen gas, whereas the surrounding metal layer and fiber reinforced resin layer are difficult to permeate hydrogen gas. Therefore, the hydrogen gas filled in the gas tank permeates the resin layer and stays at the boundary between the resin layer and the metal layer. As a result, such hydrogen gas concentrates in a small gap such as a valve mounting portion, and the hydrogen gas having a high concentration leaks from there. Such hydrogen release increases with the size (especially the surface area) of the gas tank.

  On the other hand, since the gas tank is a source of high-pressure gas, in order to ensure safety, a gas leak inspection around it is essential. Further, when a plurality of gas tanks are mounted, the joint portion of the pipe connected to the gas tank is also subject to gas leak inspection. Therefore, when the fuel cell system is in operation, the presence or absence of gas leakage is monitored by a hydrogen detector installed around the gas tank, and a gas leakage inspection using a handy detector is also performed as needed.

  However, in such a gas leak test, hydrogen gas that is naturally released by passing through the wall of the gas tank may be detected. However, once hydrogen gas is detected, whether the hydrogen gas is a leak due to a malfunction of a component (for example, a valve or a joint of a pipe) or a natural permeation. It cannot be determined. For this reason, the result of the gas leak inspection becomes ambiguous and the reliability is lowered. Even if the detected amount of hydrogen gas does not reach the alarm level, if there is any change in the detection result, it may be subject to inspection, which may hinder the operation of the fuel cell system. is there.

As a related technique, Patent Document 1 discloses that a roof cover that forms a tank storage space is provided with a ventilation port, and hydrogen gas leaked from a hydrogen cylinder flows out. Patent Document 2 discloses that an upper outside air inlet is provided in the roof cover to dilute hydrogen gas leaked from the hydrogen tank. Furthermore, Patent Document 3 describes that hydrogen that has permeated through a hydrogen tank is stored in the tank, and the hydrogen gas stored in the tank is used as fuel.
JP 2006-188166 A JP 2006-188167 A JP 2004-168151 A

  However, any of the inventions described in Patent Documents 1 to 3 above treats hydrogen gas that oozes out from the gas tank and stays in the gas tank storage space, and oozes out from a part of the gas tank having a multilayer structure. There is no mention of high-concentration hydrogen gas treatment.

  Therefore, an object of the present invention is to suppress leakage of hydrogen gas having a high concentration in a fuel gas tank having a multilayer structure including a resin layer. Moreover, an object of this invention is to provide a fuel cell system provided with such a fuel gas tank.

In order to achieve the above object, a fuel gas tank according to a first aspect of the present invention is a fuel gas tank filled with fuel gas, and is a first layer formed of a material that is permeable to fuel gas. And a second layer formed of a material that is less permeable to the fuel gas than the first layer outside the first layer, and the second layer includes the second layer. An opening that penetrates the layer in the thickness direction is formed.
With such a configuration, the hydrogen gas that has permeated the first layer from the inside of the fuel gas tank can be discharged to the outside while being diluted from the opening of the second layer.

  Here, a space may be formed in at least a part between the first layer and the second layer. Thereby, the hydrogen gas which permeate | transmitted the 1st layer can be discharge | released outside more easily.

A fuel gas tank according to a second aspect of the present invention is a fuel gas tank filled with fuel gas, the first layer formed of a material having permeability to the fuel gas, and the first layer. A catalyst layer formed by a catalyst material that promotes the oxidation of the fuel gas, and a material formed by a material that is less permeable to the fuel gas than the first layer outside the catalyst layer. Two layers.
With such a configuration, the hydrogen gas that has passed through the first layer from the inside of the fuel gas tank can be burned and consumed by the action of the catalyst.

  Here, the catalyst layer may be formed by mixing the catalyst material into a solid polymer material. Thereby, since the combustion reaction of hydrogen gas by the action of the catalyst occurs in the solid polymer material, the influence on the adjacent first and second layers can be suppressed.

A fuel gas tank according to a third aspect of the present invention is a fuel gas tank filled with fuel gas, the first layer formed of a material having permeability to the fuel gas, and the first layer. A fuel cell layer disposed outside the fuel cell layer; and a second layer formed of a material that is less permeable to the fuel gas than the first layer outside the fuel cell layer, The layer includes an electrolyte, a fuel electrode disposed on the first layer side of the electrolyte, and an oxygen electrode disposed on the second layer side of the electrolyte.
With such a configuration, hydrogen gas that has passed through the first layer from the inside of the fuel gas tank can be consumed in the fuel cell.

  Here, by further providing a current collecting layer connected to the fuel cell layer, it becomes easy to release or use the electricity generated in the fuel cell to the outside.

A fuel cell system according to a first aspect of the present invention includes a fuel cell that generates electric power by an electrochemical reaction between a fuel gas and an oxidizing gas, and the fuel gas tank according to the first to third aspects.
With such a configuration, hydrogen gas leakage due to natural permeation in the fuel gas tank can be suppressed. Therefore, when a gas leak is detected in a normal gas leak inspection of the fuel cell system, the cause of the leak is reduced. It becomes easy to discriminate.

A fuel cell system according to a second aspect of the present invention includes a fuel cell that generates electric power by an electrochemical reaction between a fuel gas and an oxidizing gas, a fuel gas tank according to the third aspect, and the fuel cell layer of the fuel gas tank. Power storage means for storing the electrical energy generated in step.
With such a configuration, it is possible to effectively use the hydrogen gas that has permeated through the first layer, and to improve the energy efficiency of the entire fuel cell system.

A fuel cell system according to a third aspect of the present invention includes a fuel cell that generates electricity by an electrochemical reaction between a fuel gas and an oxidizing gas, a fuel gas tank according to the third aspect, and the fuel cell layer of the fuel gas tank. On the basis of an ammeter for measuring the value of the current generated in the step, a temperature measuring means for measuring a value corresponding to the temperature in the fuel gas tank, a measured value by the ammeter and a measured value by the temperature measuring means, Pressure calculating means for determining the pressure in the fuel gas tank.
By setting it as such a structure, the pressure in a fuel gas tank can be calculated | required accurately in real time.

  According to the present invention, the hydrogen gas that has permeated through the first layer is released or consumed outside, so that the hydrogen gas stays between the first layer and the second layer, or the staying gas concentrates. Thus, it is possible to suppress the hydrogen gas having a high concentration from leaking out of the fuel gas tank. Therefore, in the fuel cell system including such a fuel gas tank, it is possible to improve the reliability of the gas leak inspection.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same reference number is attached | subjected to the same component and description is abbreviate | omitted.
FIG. 1 is a cross-sectional view showing a fuel gas tank according to a first embodiment of the present invention.
As shown in FIG. 1, the fuel gas tank 110 according to the present embodiment is a tank filled with hydrogen as a fuel gas, and is provided with a main stop valve H100 that supplies or stops supplying hydrogen gas.

The fuel gas tank 110 includes a resin layer 111 that forms a liner (inner container), and a reinforcing layer 112 disposed on the outer side thereof.
The resin layer 111 is made of, for example, a resin material such as high density polyethylene (HDPE) or polyamide (PA) resin.

  On the other hand, the reinforcing layer 112 is made of, for example, a fiber reinforced resin (a material obtained by impregnating carbon fiber or glass fiber with a resin) or a metal material (for example, stainless steel or aluminum alloy). Further, at least one opening 113 penetrating in the thickness direction is formed in the reinforcing layer 112. In FIG. 1, a plurality of openings 113 are shown. The diameter of the opening 113 is, for example, several tens of μm, preferably about 50 μm.

  By providing such an opening 113 in the reinforcing layer 112, the hydrogen gas that has permeated the resin layer 111 from the inside of the fuel gas tank 110 passes through the opening 113 and is released to the outside in a diluted state. In addition, when outside air is introduced to the boundary between the resin layer 111 and the reinforcing layer 112 through the opening 113, the hydrogen gas staying there is discharged from the opening 113 while being diluted. Thereby, it is possible to prevent hydrogen gas having a high concentration from leaking out from a part of the fuel gas tank 110 (for example, a slight gap such as the attachment portion 114 of the main stop valve H100).

Next, a fuel gas tank according to a second embodiment of the present invention will be described with reference to FIG.
The fuel gas tank 120 shown in FIG. 2 includes a resin layer 111 that forms a liner, and a reinforcing layer 121 disposed on the outside thereof.

  On the side surface 1 a of the fuel gas tank 120, a space 122 having a width of, for example, several tens of μm, preferably around 50 μm is formed over the entire circumference between the resin layer 111 and the reinforcing layer 121. The space 122 communicates with the outside air through the four vent holes 123 that open to the upper surface 1b and the lower surface 1c of the fuel gas tank 120, so that the space 122 is always ventilated.

  By disposing the reinforcing layer 121 in this way, the hydrogen gas that has permeated the resin layer 111 from the inside of the fuel gas tank 120 is diluted in the space 122 and released to the outside through the vent hole 123. Thereby, it is possible to suppress hydrogen gas having a high concentration from leaking from a part of the fuel gas tank 120 to the outside.

  In FIG. 2, the vent 123 is disposed so as to open to the upper surface 1 b and the lower surface 1 c of the fuel gas tank 120, but the position of the vent 123 is not particularly limited, and for example, the side surface 1 a of the fuel gas tank 120. You may form so that it may open to. Further, the number of the vent holes 123 is not limited to four, and at least two may be provided in order to distribute the outside air. Furthermore, the position of the space 122 formed between the resin layer 111 and the reinforcing layer 121 is not limited to the side surface 1 a, and may be formed on the upper surface 1 b side and the lower surface 1 c side, or the entire periphery of the resin layer 111. You may form in.

Next, a fuel gas tank according to a third embodiment of the present invention will be described with reference to FIG.
A fuel gas tank 130 shown in FIG. 3 includes a resin layer 111 that forms a liner, a catalyst layer 131 disposed on the outside thereof, and a reinforcing layer 112 disposed on the outside thereof. As described above, the reinforcing layer 112 has a plurality of openings 113 formed therein.

  The catalyst layer 131 is formed of a catalyst (so-called combustion catalyst) material that promotes oxidation of hydrogen gas. Examples of the catalyst material include palladium (Pd), platinum (Pt), ruthenium (Ru), silver (Ag), cobalt (Co), gold (Au), nickel (Ni), copper (Cu), manganese (Mn ), Iron (Fe), chromium (Cr), vanadium (V) and the like, and alloys containing at least one of them.

  By providing such a catalyst layer 131, the hydrogen gas that has permeated the resin layer 111 from the inside of the fuel gas tank 130 reacts with the oxygen in the air flowing from the openings 113 of the reinforcing layer 112 and burns by the action of the catalyst. To do. Thereby, hydrogen gas can be consumed and it can suppress that hydrogen gas with high concentration leaks from a fuel gas tank.

Next, a fuel gas tank according to a fourth embodiment of the present invention will be described with reference to FIG.
A fuel gas tank 140 shown in FIG. 4 includes a resin layer 111 that forms a liner, a catalyst-containing polymer layer 141 disposed outside the liner, and a reinforcing layer 112 disposed outside the layer. As described above, the reinforcing layer 112 has a plurality of openings 113 formed therein.

  The catalyst-containing polymer layer 141 includes, for example, palladium (Pd), platinum (Pt), ruthenium (Ru), silver (Ag), cobalt (Co), gold (Au), nickel (Ni), copper (Cu), A catalyst material that promotes oxidation of hydrogen gas, such as manganese (Mn), iron (Fe), chromium (Cr), vanadium (V), or an alloy containing at least one of them, It is mixed in a solid polymer material. As this solid polymer material, a material used as an electrolyte in a general polymer electrolyte fuel cell, that is, a main chain of a solid polymer such as a fluorine-based resin has a side chain such as a sulfone group or a carboxylic acid group. The attached conductive material having an ion exchange function is used.

  By providing such a catalyst-containing polymer layer 141, the hydrogen gas that has permeated the resin layer 111 from the inside of the fuel gas tank 140 is caused by the action of the catalyst in the layer of the catalyst-containing polymer layer 141. It reacts with oxygen in the air flowing in from the opening 113 and burns. Thereby, hydrogen gas can be consumed.

  According to this embodiment, the combustion reaction of hydrogen gas is caused in the layer of the catalyst-containing polymer layer 141, so that the influence on other members (for example, the adjacent resin layer 111 and the reinforcing layer 112) can be suppressed. It becomes possible.

Next, a fuel gas tank according to a fifth embodiment of the present invention will be described with reference to FIG.
The fuel gas tank 150 shown in FIG. 5 includes a resin layer 111 that forms a liner, a fuel cell layer 151 disposed on the outer side thereof, a current collecting layer 152 disposed on the periphery thereof, and a reinforcing layer disposed on the outer side. 112. As described above, the reinforcing layer 112 has a plurality of openings 113 formed therein.

  The fuel cell layer 151 has a solid polymer fuel cell structure including an electrolyte layer, a fuel electrode formed on one side of the electrolyte layer, and an oxygen electrode formed on the other side of the electrolyte layer. is doing. In the present embodiment, the fuel cell layer 151 is disposed so that the fuel electrode side faces the resin layer 111. The current collecting layer 152 is made of a conductive material such as a metal net, or preferably a metal film with a vent hole.

  The hydrogen gas that has passed through the resin layer 111 from the inside of the fuel gas tank 150 is supplied to the fuel electrode of the fuel cell layer 151. On the other hand, air (outside air) that has entered from the opening 113 of the reinforcing layer 112 is supplied to the oxygen electrode. Thereby, an electrochemical reaction occurs in the fuel cell layer 151, and electricity is generated and collected by the current collecting layer 152. At that time, for example, when the fuel gas tank 150 is incorporated in a fuel cell system to be described later and mounted in a vehicle, the generated electricity can be released through the current collecting layer 152 and the vehicle body (so-called vehicle body grounding).

  Thus, according to the present embodiment, the hydrogen gas that has permeated through the resin layer 111 can be consumed by power generation in the fuel cell layer 151. In the present embodiment, the current collecting layer 152 is provided only on the outer side (oxygen electrode side) of the fuel cell layer 151. However, the current collecting layer may be provided on the inner side (air electrode side).

  In the above 1st-5th embodiment, the liner was formed with the resin material, and the case where the reinforcement layer which protects and strengthens a liner was formed with fiber reinforced resin or a metal material was demonstrated. However, the material of the liner and the reinforcing layer is not limited thereto, and the present invention can be applied when hydrogen gas permeability in the reinforcing layer is lower than that of the liner.

FIG. 6 schematically shows a fuel cell system to which the hydrogen gas cylinder according to the first to fifth embodiments of the present invention is applied.
Hereinafter, the case where this fuel cell system is applied to an in-vehicle fuel cell system of a fuel cell vehicle will be described. However, the present invention is not limited to such an application example, and can be applied to any moving body such as a ship, an aircraft, a train, and a walking robot. And, for example, a stationary power generation system in which a fuel cell is used as a power generation facility for a building (house, building, etc.) is also possible. 6 shows an example in which the fuel gas tank 110 shown in FIG. 1 is applied to a fuel cell system. However, the fuel gas tanks 120 to 150 shown in FIGS. .

  In the fuel cell system shown in FIG. 6, hydrogen gas as fuel gas is supplied from the fuel gas tank 110 to the hydrogen supply port of the fuel cell 20 via the hydrogen supply path 74. In the hydrogen supply path 74, a main stop valve H100 that supplies or stops supplying hydrogen from the fuel gas tank 110, a hydrogen pressure regulating valve H9 that adjusts the supply pressure of hydrogen gas to the fuel cell 20 by reducing the pressure, and the fuel cell 20 A shutoff valve H21 for opening and closing between the hydrogen supply port and the hydrogen supply path 74 is provided. Although one fuel gas tank 110 is shown in FIG. 6, a desired number of fuel gas tanks 110 may be mounted according to the mounting space, the required cruising distance, and the like.

  The hydrogen gas that has not been consumed in the fuel cell 20 is discharged as hydrogen offgas (fuel gas offgas) to the hydrogen circulation path 75 and returned to the downstream side of the hydrogen pressure regulating valve H9 in the hydrogen supply path 74. The hydrogen circulation path 75 includes a gas-liquid separator H42 that recovers moisture from the hydrogen off-gas, a drain valve H41 that recovers the recovered product water in a tank (not shown) outside the hydrogen circulation path 75, and a hydrogen pump that pressurizes the hydrogen off-gas. H50 is provided.

The shut-off valve H21 closes the anode side of the fuel cell 20. The hydrogen off-gas merges with the hydrogen gas in the hydrogen supply path 74 and is supplied to the fuel cell 20 for reuse.
The hydrogen circulation path 75 is connected to the exhaust path 72 by the purge flow path 76 via the discharge control valve H51.

  On the other hand, air (outside air) as the oxidizing gas is supplied to the air supply port of the fuel cell 20 via the air supply path 71. The air supply path 71 is provided with an air filter A1 that removes particulates from the air, a compressor A3 that pressurizes the air, and a humidifier A21 that adds required moisture to the air. The compressor A3 is driven by a motor.

  Air off-gas (oxidation off-gas, humidified gas) discharged from the fuel cell 20 is discharged to the outside through the exhaust path 72. The exhaust path 72 is provided with a pressure adjustment valve A4 and a humidifier A21. The pressure adjustment valve A4 functions as a pressure regulator (pressure reduction) that sets the air pressure supplied to the fuel cell 20. The supply air pressure and the supply air flow rate to the fuel cell 20 are set by adjusting the rotation speed of the motor that drives the compressor A3 and the opening area of the pressure adjustment valve A4.

  The fuel cell 20 is configured as a fuel cell stack in which a required number of single cells that receive supply of hydrogen gas and air and generate electric power through an electrochemical reaction are stacked. The electric power generated by the fuel cell 20 is supplied to a power control unit (not shown). The power control unit consists of an inverter that supplies electric power to the drive motor of the vehicle, an inverter that supplies electric power to various auxiliary devices such as a compressor motor and a hydrogen pump motor, A DC-DC converter or the like that supplies power to the motors from the power storage means is provided.

FIG. 7 schematically shows a fuel cell system according to another embodiment of the present invention.
The fuel cell system shown in FIG. 7 includes a fuel gas tank 150 having a fuel cell layer 151 as a fuel gas supply source to the fuel cell 20, and a power storage means 200.

  The power storage means 200 includes an inverter that supplies power to a vehicle drive motor, auxiliary equipment (for example, a compressor, a hydrogen pump, a cooling pump motor, etc.), and various devices (transmissions, wheel control devices, etc.) that are involved in vehicle travel. , An actuator used in a steering device, a suspension device, etc.), an air conditioner (air conditioner) for passenger space, a means for accumulating electricity supplied to a power consuming device including lighting, audio, and the like. The power storage means 200 may be a so-called rechargeable battery or a capacitor.

  The fuel cell layer 151 disposed in the fuel gas tank 150 is connected to the power storage means 200. The electricity storage means 200 is charged by electricity generated in the fuel cell layer 151. Thereby, the effective use of electricity can be achieved and the energy efficiency of the entire fuel cell system can be improved.

FIG. 8 schematically shows a fuel cell system according to another embodiment of the present invention.
The fuel cell system shown in FIG. 7 includes a fuel gas tank 150 having a fuel cell layer 151 as a fuel gas supply source to the fuel cell 20, an ammeter 300, a temperature measurement unit 310, and a pressure calculation unit 320. .

  The ammeter 300 is connected to the fuel cell layer 151 of the fuel gas tank 150, measures the intensity of the current generated in the fuel cell layer 151, and outputs the measured current value. The temperature measurement unit 310 includes, for example, a thermocouple, and outputs a measurement value (specifically, a voltage value) corresponding to the temperature in the fuel gas tank 150 to the pressure calculation unit 320.

  The pressure calculation unit 320 calculates the pressure value in the fuel gas tank 150 based on the current value output from the ammeter 300 and the measurement value output from the temperature measurement unit 310. Here, as the pressure in the fuel gas tank 150 increases, the amount of hydrogen gas that permeates from the resin layer 111 also increases, so that the current generated in the fuel cell layer 151 also increases. Therefore, the pressure can be estimated by measuring the current value and taking the correlation with the temperature in the fuel gas tank 150. The pressure value thus calculated is output to the control unit 330, for example, and used for controlling various valves and devices.

It is sectional drawing which shows the fuel gas tank which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the fuel gas tank which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the fuel gas tank which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the fuel gas tank which concerns on the 4th Embodiment of this invention. It is sectional drawing which shows the fuel gas tank which concerns on the 5th Embodiment of this invention. 1 is a system configuration diagram schematically showing a fuel cell system to which a fuel gas tank according to first to fifth embodiments of the present invention is applied. It is a system block diagram which shows roughly the fuel cell system with which the fuel gas tank which concerns on the 5th Embodiment of this invention is applied. FIG. 9 is a system configuration diagram schematically showing another fuel cell system in which a fuel gas tank according to a fifth embodiment of the present invention is used.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1a Side surface, 1b ... Upper surface, 1c ... Lower surface, 20 ... Fuel cell, 110, 120, 130, 140, 150 ... Fuel gas tank, 111 ... Resin layer, 112, 121 ... Reinforcement layer, 113 ... Opening, 122 ... Space, 123 DESCRIPTION OF SYMBOLS ... Vent, 131 ... Catalyst layer, 141 ... Catalyst containing polymer layer, 151 ... Fuel cell layer, 152 ... Current collecting layer, 200 ... Power storage means, 300 ... Ammeter, 310 ... Temperature measuring part, 320 ... Pressure calculating part , 330 ... control unit

Claims (9)

A fuel gas tank filled with fuel gas,
A first layer formed of a material that is permeable to fuel gas;
A second layer formed of a material having a lower permeability to the fuel gas than the first layer outside the first layer;
With
The fuel gas tank, wherein an opening penetrating in the thickness direction of the second layer is formed in the second layer.   The fuel gas tank according to claim 1, wherein a space is formed in at least a part between the first layer and the second layer. A fuel gas tank filled with fuel gas,
A first layer formed of a material that is permeable to fuel gas;
A catalyst layer formed by a catalyst material that promotes oxidation of the fuel gas outside the first layer;
A second layer formed of a material having a lower permeability to the fuel gas than the first layer outside the catalyst layer;
A fuel gas tank.   The fuel gas tank according to claim 3, wherein the catalyst layer is formed by mixing the catalyst material into a solid polymer material. A fuel gas tank filled with fuel gas,
A first layer formed of a material that is permeable to fuel gas;
A fuel cell layer disposed outside the first layer;
A second layer formed of a material having a lower permeability to the fuel gas than the first layer outside the fuel cell layer;
With
The fuel cell layer includes an electrolyte, a fuel electrode disposed on the first layer side of the electrolyte, and an oxygen electrode disposed on the second layer side of the electrolyte.   The fuel gas tank according to claim 5, further comprising a current collecting layer connected to the fuel cell layer. A fuel cell that generates electricity by an electrochemical reaction between a fuel gas and an oxidizing gas;
The fuel gas tank according to any one of claims 1 to 6,
A fuel cell system comprising: A fuel cell that generates electricity by an electrochemical reaction between a fuel gas and an oxidizing gas;
A fuel gas tank according to claim 5;
Power storage means for storing electrical energy generated in the fuel cell layer of the fuel gas tank;
A fuel cell system comprising: A fuel cell that generates electricity by an electrochemical reaction between a fuel gas and an oxidizing gas;
A fuel gas tank according to claim 5;
An ammeter for measuring a value of current generated in the fuel cell layer of the fuel gas tank;
Temperature measuring means for measuring a value corresponding to the temperature in the fuel gas tank;
Pressure calculating means for determining the pressure in the fuel gas tank based on the measured value by the ammeter and the measured value by the temperature measuring means;
A fuel cell system comprising:

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