JP2000164235A - Solid polymeric fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the freedom in piping for reducing the danger of explosion following hydrogen-oxygen mixture and freely controlling a cooled area with cooling medium. SOLUTION: This system includes a solid polymeric fuel cell stack 29 using a solid polymeric electrolytic film as an electrolyte, a temperature/humidity convertion part 11 for putting oxidant gas after passing through a cell reaction part in contact with oxidant gas before passing through the cell reaction part via a water retentive porous material to accomplish heat exchange and humidity exchange and a plate having at least one type of communication through passage for fuel gas, oxidant gas and cooling medium, the solid polymeric fuel cell stack 29 and the temperature/humidity conversion part 11 being formed in one unit via the plate. A supply pipe 31 and a discharge pipe 38 for oxidant gas and supply pipes 33, 34 and discharge pipes 37, 39 for fuel gas and cooling medium are provided on the end face of the temperature/humidity conversion part 11 opposite to a plate contact face and on the end face of the solid polymeric fuel cell stack 29 opposite to the plate contact face, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer electrolyte fuel cell using a solid polymer electrolyte membrane as an electrolyte, and more particularly to a temperature and humidity for transferring heat and water vapor contained in a reacted gas to an unreacted gas. The present invention relates to a polymer electrolyte fuel cell system having an exchange (hereinafter, referred to as temperature and humidity exchange) structure.

[0002]

2. Description of the Related Art A fuel cell electrochemically reacts a fuel gas such as hydrogen with an oxidizing gas such as air to produce a fuel cell.
This is a device that directly converts the chemical energy of fuel into electric energy.

[0003] This type of fuel cell is classified into various types depending on the difference in electrolyte and the like. One of them is a solid polymer fuel cell using a solid polymer electrolyte membrane as an electrolyte. ing.

FIG. 17 is a cross-sectional view showing a configuration example of this type of polymer electrolyte fuel cell stack.

In FIG. 17, a polymer electrolyte fuel cell stack includes a pair of gas diffusion electrodes including a fuel electrode (hereinafter, referred to as an anode electrode) 1 and an oxidant electrode (hereinafter, referred to as a cathode electrode) 2. In order to supply a reaction gas to a unit cell 5 having a solid polymer electrolyte membrane 4 having ion conductivity and a gas separation function interposed therebetween through a catalyst layer 3 made of Pt or the like, and to each of the electrodes 1 and 2. And a gas-impermeable separator 6 having a groove.

When a fuel gas such as hydrogen is supplied to the anode electrode 1 and an oxidizing gas such as air is supplied to the cathode electrode 2, an electromotive force is generated in the cell 5 by an electrochemical reaction. Since the electromotive force of the unit cell 5 is as low as about 1 V at most, it is usually used as a unit cell stack 7 in which a plurality of unit cells 5 are stacked. Since this electrochemical reaction is an exothermic reaction, in order to remove excess heat, a cooling plate through which a cooling medium (a refrigerant) flows is provided for each unit cell stack 7 in which a plurality of unit cells 5 are stacked via a separator 6. 8 has been inserted.

[0007] Gas leakage to the outside of the system causes a reduction in gas utilization rate and a risk of explosion due to a combustible gas such as hydrogen, so that the space between the solid polymer electrolyte membrane 4 and the separator 6 is reduced.
Gas sealing is performed using a sealing material 9.

In the cathode electrode 2, water is generated along with the electrode reaction. However, if water condenses in the electrode reaction part, gas diffusivity deteriorates. Therefore, this water is discharged out of the battery together with unreacted gas. It has become so.

As the solid polymer electrolyte membrane 4, for example, a perfluorosulfonic acid membrane which is a fluorine-based ion exchange membrane is known. These solid polymer electrolyte membranes have a hydrogen ion exchange group in the molecule. It functions as an ion conductive substance by being saturated with water.

However, conversely, the solid polymer electrolyte membrane 4
When, is dried, the ionic conductivity is deteriorated, and the battery performance is significantly reduced. Therefore, means for preventing the drying of the solid polymer electrolyte membrane 4 is required. There is known a method for moving contained water vapor to an unreacted gas.

In this method, a low-temperature unreacted gas and a high-temperature reacted gas are permeated through a mesh-shaped flow path to allow water to permeate, and other gases are difficult to permeate. The contact through the body causes condensation of the water contained in the reacted gas in the porous body, and the porous body is wetted by the condensed water. In addition, since the heat exchange is also performed at the same time, the temperature of the unreacted gas increases, and moisture evaporates from the porous body, so that the unreacted gas is humidified. That is, it is possible to humidify without using liquid water.

FIG. 18 is an exploded perspective view showing a configuration example of a conventional polymer electrolyte fuel cell system.

In FIG. 18, the polymer electrolyte fuel cell system includes a battery unit 10 comprising the above-described polymer electrolyte fuel cell stack and a temperature / humidity exchange unit 11 for performing heat exchange and humidity exchange with a fuel gas, The structure is integrated via an end plate 12 having a through flow passage for communication of an oxidizing gas and a cooling medium.

At one end face of the temperature / humidity exchange section 11 side, inlets 13, 14, 15 for oxidizing gas, fuel gas and cooling medium, and outlets 16 and 1 for oxidizing gas, fuel gas and cooling medium.
7, 18 are provided as shown,
An unreacted gas inlet manifold 19 and a reacted gas outlet manifold 20 are provided as shown.

On the other end of the temperature / humidity exchange unit 11 side,
A reacted gas inlet manifold 21 and an unreacted gas outlet manifold 22 are respectively provided as shown.

On the other hand, on the opposite end face of the end plate 12 of the battery section 10, inlets 23, 24, 25 for oxidizing gas, fuel gas and cooling medium, and outlets 26 for oxidizing gas, fuel gas and cooling medium, 27 and 28 are provided as shown.

[0017]

In the means described above, the amount of water vapor in the reaction gas supplied in a non-humidifying operation or the like is reduced by circulating the water generated at the cathode electrode 2 in the battery. Even in this case, the solid polymer electrolyte membrane 4 is prevented from drying, and high-performance, excellent in compactness, and can be reliably started in a short time even at a low temperature where the ambient temperature is 0 ° C. or less. A solid polymer fuel cell system can be obtained.

However, on the end face on the temperature and humidity exchange part side,
Since the supply ports for the oxidizing gas, the fuel gas and the cooling medium are required, not only the pipes are concentrated on the same end face, which complicates the operation, but also the oxygen as the oxidizing gas and the hydrogen as the fuel gas become hot. There is a danger of explosion due to the hydrogen-oxygen mixture because they are present simultaneously inside the humidity exchange section.

Further, it is necessary to secure a flow path for the cooling medium inside the temperature / humidity exchange section, and the cooling medium passes through the temperature / humidity exchange section where cooling is not preferable, and the cooling is performed semi-forcibly. become.

It is an object of the present invention to dissipate each supply port in a state where the characteristics of the temperature / humidity exchange section are secured, thereby increasing the freedom of piping and reducing the risk of explosion accompanying hydrogen-oxygen mixing. Another object of the present invention is to provide a polymer electrolyte fuel cell system capable of freely controlling a cooling region by a cooling medium.

[0021]

In order to achieve the above object, according to the first aspect of the present invention, a solid polymer electrolyte membrane is provided between a pair of gas diffusion electrodes comprising a fuel electrode and an oxidizer electrode via a catalyst layer. A cell which generates electric power by generating electricity by an electrochemical reaction of the fuel gas and the oxidizing gas in the battery reaction section, and supplies the fuel gas and the oxidizing gas to the fuel electrode and the oxidizing electrode. A gas-impermeable separator having a groove for supplying, a polymer electrolyte fuel cell stack formed by stacking a plurality of layers via a cooling plate through which a cooling medium flows, and an oxidizing gas and a battery that have passed through a cell reaction section A temperature-humidity exchange unit for exchanging heat and humidity by contacting an oxidizing gas before passing through the reaction unit via a water-retentive porous body, and at least one of a fuel gas, an oxidizing gas, and a cooling medium For contact And a plate having a through passage,
The polymer electrolyte fuel cell stack and the temperature / humidity exchange unit are integrated via a plate, and an oxidant gas supply pipe and an exhaust pipe are provided on the end face of the temperature / humidity exchange section opposite to the plate contact surface. A supply pipe and a discharge pipe for the fuel gas and the cooling medium are provided on the end face opposite to the plate contact face of the molecular fuel cell stack.

Therefore, in the polymer electrolyte fuel cell system according to the first aspect of the present invention, a supply pipe and a discharge pipe for the oxidizing gas are provided on the opposite end faces of the temperature and humidity exchange section to the plate contact face, By providing a supply pipe and a discharge pipe for the fuel gas and the cooling medium on the end surface opposite to the plate contact surface of the fuel cell stack, it is possible to dissipate each supply port, thereby improving the flexibility of piping and improving hydrogen The risk of explosions associated with oxygen mixing can be reduced.

According to the second aspect of the present invention, the first aspect is provided.
In the polymer electrolyte fuel cell system of the invention, the plate is made of a metal plate such as stainless steel or aluminum coated with a corrosion-resistant coating.

Therefore, in the polymer electrolyte fuel cell system according to the second aspect of the present invention, the plate between the polymer electrolyte fuel cell stack and the temperature / humidity exchange unit is made of stainless steel or aluminum coated with a corrosion resistant coating. By using the metal plate described above, the fuel cell as a whole can be made compact and the strength can be improved by reducing the thickness of the plate, and since it has electrical conductivity, it can also serve as a current collector plate.

Further, according to the invention of claim 3, in the polymer electrolyte fuel cell system of the invention of claim 1, the plate is constituted by a plate made of a nonmetal such as resin.

Therefore, in the polymer electrolyte fuel cell system according to the third aspect of the present invention, the plate interposed between the polymer electrolyte fuel cell stack and the temperature / humidity exchange unit is made of a plate made of a nonmetal such as resin. With this configuration, it is possible to reduce the weight of the entire fuel cell.

On the other hand, according to the invention of claim 4, the above-mentioned claim 1 is provided.
In the polymer electrolyte fuel cell system according to the invention, the plate is formed by integrating a metal plate such as stainless steel or aluminum with a corrosion-resistant coating on at least the cell side end surface of a plate made of a nonmetal such as resin. It consists of multiple plates.

Therefore, in the polymer electrolyte fuel cell system according to the fourth aspect of the present invention, the plate interposed between the polymer electrolyte fuel cell stack and the temperature / humidity exchange unit is replaced with a plate made of a nonmetal such as resin. At least on the battery end face,
By constructing a multi-layered plate with a sandwich structure in which metal plates such as stainless steel or aluminum with a corrosion-resistant coating are integrated, the weight of the fuel cell can be reduced without impairing the strength of the plate. It can also serve as a current collector.

According to the invention of claim 5, the above-mentioned claim 1 is provided.
In the polymer electrolyte fuel cell system according to the invention, the plate is made of a material having a thermal conductivity of less than 10 W / mK.

Therefore, in the polymer electrolyte fuel cell system according to the fifth aspect of the present invention, the plate interposed between the polymer electrolyte fuel cell stack and the temperature / humidity exchange unit is made of a material having a thermal conductivity of less than 10 W / mK. In addition to minimizing heat transfer to the temperature / humidity exchange section through the plates, the temperature of the plate-side end of the polymer electrolyte fuel cell stack is prevented from lowering, and the cell performance is degraded. Can be prevented.

Further, according to the invention of claim 6, in the polymer electrolyte fuel cell system according to the invention of claim 1, the plate is made of the same material as the separator constituting the polymer electrolyte fuel cell stack, and at least the same material is used. It has an outer shape.

Therefore, in the polymer electrolyte fuel cell system according to the sixth aspect of the present invention, the plate interposed between the polymer electrolyte fuel cell stack and the temperature / humidity exchange unit is a separator constituting the polymer electrolyte fuel cell stack. By using the same material and having at least the same outer shape, cost can be reduced by reducing the number of parts and the number of processing steps, and can also serve as a current collector plate.

On the other hand, in the invention of claim 7, a solid polymer electrolyte membrane is sandwiched between a pair of gas diffusion electrodes composed of a fuel electrode and an oxidizer electrode via a catalyst layer, so that the fuel gas in the battery reaction section is A cell that generates electric power by generating electricity by an electrochemical reaction of an oxidizing gas and a gas-impermeable separator having a groove for supplying the fuel gas and the oxidizing gas to the fuel electrode and the oxidizing electrode. And a polymer electrolyte fuel cell stack composed of a plurality of stacked fuel plates via a cooling plate through which a cooling medium flows, and an oxidant gas that has passed through the cell reaction section and an oxidant gas that has not passed through the cell reaction section. A temperature-humidity exchange unit that performs heat exchange and humidity exchange, and a plate having at least one kind of through-flow passage for communication of a fuel gas, an oxidizing gas, and a cooling medium, solid The molecular fuel cell stack and the temperature / humidity exchange unit are integrated via a plate, wherein the plate has a fuel gas supply pipe on an end surface opposite to the plate contact surface of the polymer electrolyte fuel cell stack, and It has a discharge pipe on the side of the part.

Therefore, in the polymer electrolyte fuel cell system according to the present invention, the plate has a fuel gas supply pipe on an end surface opposite to the plate contact surface of the polymer electrolyte fuel cell stack, and By having the discharge pipe on the side surface of the plate portion, each supply port can be dissipated, so that the degree of freedom of the pipe can be improved and the danger of explosion due to the hydrogen-oxygen mixture can be reduced.

According to the present invention, a solid polymer electrolyte membrane is sandwiched between a pair of gas diffusion electrodes composed of a fuel electrode and an oxidant electrode via a catalyst layer, so that the fuel gas in a battery reaction section is formed. A cell that generates electric power by generating electricity by an electrochemical reaction of an oxidizing gas and a gas-impermeable separator having a groove for supplying the fuel gas and the oxidizing gas to the fuel electrode and the oxidizing electrode. And a polymer electrolyte fuel cell stack composed of a plurality of stacked fuel plates via a cooling plate through which a cooling medium flows, and an oxidant gas that has passed through the cell reaction section and an oxidant gas that has not passed through the cell reaction section. And a temperature and humidity exchange unit for performing heat exchange and humidity exchange through contact with each other through a porous body, and a fuel gas, an oxidizing gas,
Two plates each having at least one kind of through-flow passage for communication of a cooling medium, and a temperature / humidity exchange unit is integrated on both sides of the polymer electrolyte fuel cell stack one by one through the plates, On the side that is not the plate contact surface of the humidity exchange unit, there is a supply pipe and an exhaust pipe for the oxidizing gas, and on the other side that is not the plate contact surface of the temperature and humidity exchange unit, there are supply pipes for the fuel gas and the cooling medium. Has a discharge pipe.

Therefore, in the polymer electrolyte fuel cell system according to the present invention, the supply and discharge pipes for the oxidizing gas are provided on the side of the one temperature / humidity exchange part which is not the plate contact surface, and the other. Since the temperature and humidity of the fuel gas are exchanged by providing the supply and exhaust pipes for the fuel gas and the cooling medium on the side of the temperature / humidity exchange unit that is not the plate contact surface, pure hydrogen is used for the fuel gas. And high security can be ensured.

Further, according to the ninth aspect of the present invention, in the polymer electrolyte fuel cell system according to the eighth aspect of the present invention, a supply pipe for a cooling medium is provided on a fuel gas supply pipe side, and a fuel gas supply pipe is provided. The far plate has an outlet tube.

Therefore, in the polymer electrolyte fuel cell system according to the ninth aspect of the present invention, the cooling medium supply pipe is provided on the fuel gas supply pipe side, and the discharge pipe is provided on the plate remote from the fuel gas supply pipe. , It is possible to exempt the cooling of the temperature / humidity exchanging unit which is not desired to be cooled.

On the other hand, according to the invention of claim 10, a solid polymer electrolyte membrane is sandwiched between a pair of gas diffusion electrodes composed of a fuel electrode and an oxidant electrode via a catalyst layer, and the A cell that generates electric power by generating electricity by an electrochemical reaction of an oxidizing gas and a gas-impermeable separator having a groove for supplying the fuel gas and the oxidizing gas to the fuel electrode and the oxidizing electrode. And two polymer electrolyte fuel cell stacks formed by laminating a plurality of cooling mediums through a cooling plate through which the cooling medium flows, an oxidizing gas passing through the battery reaction section, and an oxidizing gas before passing through the cell reaction section. Plate having a temperature-humidity exchange unit for exchanging heat and humidity and contacting at least one kind of through-flow channel for fuel gas, oxidizing gas, and cooling medium by bringing the two into contact with each other via a water-retentive porous body. The solid polymer fuel cell stacks are integrated on both sides of the temperature and humidity exchange unit one by one via a plate, and the supply and discharge pipes of the oxidant are provided on the side of the temperature and humidity exchange unit that is not the plate contact surface. And a fuel gas supply pipe and a discharge pipe at the end face opposite to the plate contact face of the polymer electrolyte fuel cell stack.

Therefore, in the polymer electrolyte fuel cell system according to the tenth aspect of the present invention, the supply and discharge pipes for the oxidizing agent are provided on the side of the temperature / humidity exchange unit which is not the plate contact surface. By providing a fuel gas supply pipe and a discharge pipe on the end surface opposite to the plate contact surface of the fuel cell stack, the length of the polymer electrolyte fuel cell stack is reduced by half, so that the reacted oxidant gas is heated again. The time required to reach the humidity exchanging unit is less than half, and a rapid response change of the output can be made with a good response.

According to the eleventh aspect of the present invention, in the polymer electrolyte fuel cell system according to the tenth aspect,
The polymer electrolyte fuel cell stack has a fuel gas supply pipe on the end face opposite to the plate contact face, and a discharge pipe on the side face on the plate contact face side.

Therefore, in the polymer electrolyte fuel cell system according to the eleventh aspect of the present invention, the solid polymer fuel cell stack has a fuel gas supply pipe on the end face opposite to the plate contact face, and has a fuel gas supply pipe. Since the length of the polymer electrolyte fuel cell stack is halved by having the exhaust pipe on the side of the, the time required for the reacted oxidant gas to reach the temperature and humidity exchange section again becomes less than half, Not only can the reaction be performed with good response even during a transient change in output, but also the number of pipes on the end surface of the polymer electrolyte fuel cell stack can be reduced, and the degree of freedom of the entire pipes can be improved.

[0043]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment: Corresponding to Claims 1 to 6) FIG. 1 is a bird's-eye view showing a configuration example of a polymer electrolyte fuel cell system according to this embodiment, and FIG. It is a longitudinal sectional view showing a configuration example of a fuel cell system,
17 and 18 are denoted by the same reference numerals.

This embodiment is characterized by a flow path configuration of air as an oxidizing gas, hydrogen as a fuel gas, and antifreeze as a coolant (medium). And the unit are integrated via a plate having at least one type of through-flow passage for communication of fuel gas, oxidizing gas, and coolant, and the end surface of the temperature / humidity exchange unit opposite to the plate contact surface is provided with an oxidizing gas. A supply pipe and a discharge pipe are provided, and a supply pipe and a discharge pipe for the fuel gas and the coolant are provided on an end surface opposite to the plate contact surface of the polymer electrolyte fuel cell stack.

That is, as shown in FIG. 1, the polymer electrolyte fuel cell system has a structure in which the battery section comprising the above-described polymer electrolyte fuel cell stack 29 and the temperature / humidity exchange section 11 are integrated. The unreacted air, which is an oxidant gas, is guided to the temperature / humidity exchange unit 11 through the oxidant supply port 31 provided in the end plate 30 on the temperature / humidity exchange unit 11 side.

Hydrogen as a fuel gas and antifreeze as a coolant pass through a fuel gas supply port 33 and a coolant supply port 34, respectively, which are piped to the end plate 32 on the side of the polymer electrolyte fuel cell stack 29. To the battery section.

The supplied unreacted air is distributed to each temperature / humidity exchange cell 11 a of the temperature / humidity exchange section 11, and then passes through an unreacted gas outlet manifold 22 provided in the intermediate plate 35 to pass through the battery section. Flows into. The unreacted air passes through the end plate 32 on the side of the polymer electrolyte fuel cell stack 29 and causes an electrochemical reaction in each fuel cell stack cell with the unreacted fuel gas flowing into the cell section. Oxidant reflux port 36 on the intermediate plate 35 side
Refluxes to the temperature / humidity exchange unit 11 from.

On the other hand, the fuel gas after the reaction is discharged through the fuel gas outlet 37 of the end plate 32 on the polymer electrolyte fuel cell stack 29 side. The high-temperature, high-humidity reacted air that has completed the reaction in the battery unit and returns to the temperature-humidity exchange unit 11 passes through the already-reacted gas inlet manifold 21 provided in the intermediate plate 35 and enters the temperature-humidity exchange unit 11. After being guided and distributed to each temperature / humidity exchange cell 11a, it is discharged through the already reacted gas outlet manifold 20.

At this time, the temperature and the humidity are exchanged with the unreacted air existing in the temperature and humidity exchange section 11 through the water-retentive porous body, and the unreacted air is removed from the gas outlet manifold 22 as described above. The reacted air is discharged to the battery section through the oxidant discharge port 38 provided in the temperature and humidity exchange section 11.

The antifreeze as a coolant is supplied from a coolant supply port 34 provided in the end plate 32 on the hydrogen supply side, passes through an inlet manifold provided in the end plate 32, and passes through the solid polymer type fuel. Battery stack 2
It is guided to 9 parts, flows between the battery cells, and cools each cell. After circulating in the battery unit, the antifreeze is discharged from the coolant outlet 39 through an outlet manifold provided on the end plate 32 side, which is a coolant supply side.

The polymer electrolyte fuel cell stack 29
Includes an oxidant inlet 40, a fuel gas inlet 41, a coolant inlet 42, an oxidant recirculation port 36, a fuel gas recirculation port 43,
Coolant recirculation ports 44 are provided as shown.

The intermediate plate 35 is made of, for example, stainless steel or corrosion-resistant aluminum as shown in FIG. 3, and is gas-sealed with the temperature / humidity exchange unit 11 by a packing 45. ing.

When a metal having a thermal conductivity similar to that of aluminum is used, the packing 45 and the temperature / humidity exchange 1
It is preferable that the heat insulating material 46 is interposed between one part and the other part.

In FIG. 3, reference numeral 47 denotes a collecting electrode.

Further, other metal materials can also be applied if air containing water vapor is subjected to a surface treatment for preventing corrosion.

On the other hand, the present invention is not limited to this. For example, as shown in FIG. 4, the intermediate plate 35 may be made of a non-metal such as resin, in which case the current collector plate 4
8 is preferably arranged.

As shown in FIG. 5, a sandwich structure may be adopted in which a thin metal plate 50 is attached to at least the end face on the battery unit side on a non-metallic plate 49 made of resin or the like.

Further, an intermediate plate 35 made of a material having a thermal conductivity smaller than 10 W / mK may be used, or, as shown in FIG.
It is also possible to substitute the separator 51 of the same material as the separator 6 constituting the above.

Next, in the polymer electrolyte fuel cell system according to the present embodiment configured as described above, the supply pipe for the air as the oxidant is connected to the temperature / humidity exchange unit 11 side to supply the hydrogen as the fuel gas. By arranging the supply pipe and the discharge pipe on the battery part side, the piping group that had conventionally concentrated on the end plate on the temperature and humidity exchange part side is dissipated, which not only increases the flexibility of piping, but also increases the temperature. The danger of oxygen-hydrogen mixing inside the humidity exchange unit 11 is completely eliminated.

Further, it is not necessary to provide an extra hydrogen flow path in the temperature / humidity exchange cell 11a, so that not only the number of processing steps but also the temperature / humidity exchange area of the entire cell area can be increased. That is, when trying to obtain the same temperature / humidity exchange capability, it is possible to achieve compactness.

Further, by arranging the supply pipe and the discharge pipe for the coolant on the battery side, the number of processing steps, the power generation area, and the temperature and humidity exchange area can be increased as in the case of the hydrogen pipe. This effect not only doubles the effect, but also inherently has a temperature dependency in performance.
It is also possible to avoid cooling of the temperature / humidity exchange unit 11 having a performance peak around the temperature.

On the other hand, when the material of the intermediate plate 35 is made of metal such as stainless steel or aluminum coated with corrosion resistance, the strength is required for the polymer electrolyte fuel cell system itself such as when mounted on a vehicle. In addition to being particularly effective, even when strength is not required, it is possible to achieve compactness by reducing the thickness, and since it has electrical conductivity, it can also serve as a current collector plate. It is also possible to omit the plate.

The polymer electrolyte fuel cell stack 29
When the material of the intermediate plate 35 connecting the unit and the temperature and humidity exchange unit 11 is made of a nonmetal such as resin, it leads to weight reduction of the entire polymer electrolyte fuel cell system and good workability. The manufacture of the inlet and outlet manifolds for the oxidant constituted by 35 is facilitated.

Further, since the plate 35 has a sandwich structure in which a thin metal plate 50 is attached to at least the end face of the non-metallic plate 49 made of resin or the like on the side of the battery unit, the above two effects are superimposed. It is possible to reduce the weight, increase the plate strength, omit the current collector plate, and have the respective advantages.

On the other hand, since the material of the intermediate plate 35 is made of a material having a thermal conductivity of less than 10 W / mK, the heat insulation from the 29 parts of the polymer electrolyte fuel cell stack to the temperature / humidity exchange part 11 is achieved. The effect is further increased, and the cell temperature decrease at the end of the stack adjacent to the intermediate plate 35 is minimized, and the temperature distribution in the stacking direction of the polymer electrolyte fuel cell stack cell is uniformized. , And the life can be extended by making the cell load uniform.

The material of the intermediate plate 35 is the separator 51 of the same material as the separator 6 constituting the polymer electrolyte fuel cell stack 29 and has at least the same outer diameter, so that the material and the number of parts can be reduced. It is possible to reduce the number of processes and the number of processing steps, thereby achieving cost reduction.

Further, since it is a separator material, it is electrically conductive, so that the current collector plate can be omitted here. In addition, depending on the separator material such as expanded graphite,
The heat insulating layer may be omitted, and the size can be further reduced.

(Second Embodiment: Claims 7 and 2)
FIG. 7 is a bird's-eye view showing a configuration example of the polymer electrolyte fuel cell system according to the present embodiment, and FIG. 8 is a longitudinal sectional view showing a configuration example of the polymer electrolyte fuel cell system. 1 and 2 are denoted by the same reference numerals.

The present embodiment is characterized by a flow path configuration of air as an oxidant gas, hydrogen as a fuel gas, and antifreeze as a coolant (medium). And a unit having at least one type of connecting through-flow channel for fuel gas, oxidizing gas, and coolant through a plate having an end face opposite to a plate contact surface of the polymer electrolyte fuel cell stack. Has a fuel gas supply pipe and a discharge pipe on the side surface of the plate portion.

That is, as shown in FIG. 7, the polymer electrolyte fuel cell system has a structure in which the battery section comprising the above-described polymer electrolyte fuel cell stack 29 and the temperature / humidity exchange section 11 are integrated. The unreacted air, which is an oxidant gas, is guided to the temperature / humidity exchange unit 11 through the oxidant supply port 31 provided in the end plate 30 on the temperature / humidity exchange unit 11 side.

The hydrogen as the fuel gas and the antifreeze as the coolant pass through the fuel gas supply port 33 and the coolant supply port 34, which are piped to the end plate 32 on the side of the polymer electrolyte fuel cell stack 29, respectively. To the battery section.

The supplied unreacted air is distributed to each temperature / humidity exchange cell 11 a of the temperature / humidity exchange section 11, passes through an unreacted gas outlet manifold 22 provided in the intermediate plate 35, and passes through the battery section. Flows into. The unreacted air passes through the end plate 32 on the side of the polymer electrolyte fuel cell stack 29 and causes an electrochemical reaction in each fuel cell stack cell with the unreacted fuel gas flowing into the cell section. Oxidant reflux port 36 on the intermediate plate 35 side
Refluxes to the temperature / humidity exchange unit 11 from.

On the other hand, the fuel gas that has completed the reaction merges inside the battery unit, and is discharged through a fuel gas outlet 37 provided on any side of the intermediate plate 35. The high-temperature, high-humidity reacted air that has completed the reaction in the battery unit and returns to the temperature-humidity exchange unit 11 passes through the already-reacted gas inlet manifold 21 provided in the intermediate plate 35 and enters the temperature-humidity exchange unit 11. After being guided and distributed to each temperature / humidity exchange cell 11a, it is discharged through the already reacted gas outlet manifold 20.

At this time, the temperature and humidity are exchanged with the unreacted air existing in the temperature and humidity exchange section 11 through the water-retentive porous body, and the unreacted air is removed from the gas outlet manifold 22 as described above. The reacted air is discharged to the battery section through the oxidant discharge port 38 provided in the temperature and humidity exchange section 11.

The antifreeze liquid, which is a coolant, is supplied from a coolant supply port 34 provided in the end plate 32 on the hydrogen supply side, passes through an inlet manifold provided inside the end plate 32, and flows through the solid polymer type fuel. Battery stack 2
It is guided to 9 parts, flows between the battery cells, and cools each cell. After circulating in the battery unit, the antifreeze is discharged from the coolant outlet 39 through an outlet manifold provided on the end plate 32 side, which is a coolant supply side.

The polymer electrolyte fuel cell stack 29
Includes an oxidant inlet 40, a fuel gas inlet 41, a coolant inlet 42, an oxidant recirculation port 36, a fuel gas recirculation port 43,
Coolant recirculation ports 44 are provided as shown.

The material of the intermediate plate 35 is the same as that of the first embodiment described above, and the description is omitted here.

Next, in the polymer electrolyte fuel cell system of the present embodiment configured as described above, the supply pipe and the discharge pipe of the air as the oxidant are connected to the temperature / humidity exchange unit 11 side by the fuel gas. By arranging certain hydrogen supply pipes on the battery side, the piping group that had previously concentrated on the end plate on the temperature and humidity exchange section is dissipated, which not only increases the flexibility of the piping, but also increases the temperature. The danger of oxygen-hydrogen mixing inside the humidity exchange unit 11 is completely eliminated.

Further, it is not necessary to provide an extra hydrogen flow path in the temperature / humidity exchange cell 11a, and it is possible to reduce the number of processing steps and to increase the temperature / humidity exchange area of the entire cell area. That is, when trying to obtain the same temperature / humidity exchange capability, it is possible to achieve compactness.

Further, since the hydrogen discharge pipe is provided at an arbitrary position of the intermediate plate, the degree of freedom of piping and the degree of freedom of installation of peripheral equipment for the hydrogen supply system, circulation system and processing system are further increased, and the compactness is improved. Can be achieved.

Further, by arranging the supply pipe and the discharge pipe for the coolant on the battery side, the number of processing steps can be reduced and the temperature and humidity exchange area can be increased as in the case of the hydrogen pipe. This effect not only doubles the effect, but also makes it possible to avoid cooling of the temperature / humidity exchange unit 11 which does not want to be cooled much due to the temperature dependence of its performance.

(Third Embodiment: Corresponding to Claims 8 and 9) FIG. 9 is a bird's-eye view showing a configuration example of a polymer electrolyte fuel cell system according to this embodiment, and FIG. FIG. 3 is a vertical cross-sectional view showing a configuration example of a fuel cell system in which the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In the present embodiment, the cell section comprising the above-mentioned polymer electrolyte fuel cell stack 29 and the temperature / humidity exchange section 1
1 and the flow path of air as an oxidant gas, hydrogen as a fuel gas, and antifreeze as a coolant (medium). Parts are integrated one by one through a plate having at least one type of through-flow passage for communication of fuel gas, oxidizing gas, and coolant, and one side of the temperature / humidity exchange section that is not the plate contact surface is oxidized. A supply pipe and a discharge pipe for the agent gas are provided, and a supply pipe and a discharge pipe for the fuel gas and the coolant are provided on the other side of the temperature / humidity exchange unit which is not the plate contact surface.

That is, as shown in FIG. 9, the polymer electrolyte fuel cell system has a structure in which the cell section is sandwiched between the two temperature / humidity exchange sections 11 with an intermediate plate 35 interposed therebetween to form an integrated structure. The unreacted air, which is the agent gas,
The end plate 30 of one of the temperature and humidity exchange units 11
Is led to the temperature / humidity exchange unit 11 through the oxidant supply port 31 provided in the pipe.

Hydrogen as a fuel gas and antifreeze as a coolant are supplied to a fuel gas supply port 33, which is provided on an end plate 30 opposite to the end plate 30 provided with an oxidant gas supply port 31, respectively. The cooling water is supplied to the other temperature / humidity exchange unit 11 through the coolant supply port 34.

The supplied unreacted air is supplied to an unreacted gas outlet manifold 2 provided inside the end plate 30.
2 to the temperature / humidity exchange unit 11, and further to the intermediate plate 3.
5 through the unreacted gas oxidant inflow port 40 to the battery section, and is distributed to each cell of the polymer electrolyte fuel cell stack 29.

The reacted high-temperature, high-humidity air that has passed through the cells in the battery section and has completed the reaction merges in the battery section, and flows through the oxidant reflux port 36 at the end of the polymer electrolyte fuel cell stack 29 through the intermediate plate. 35, and further led to the temperature / humidity exchange unit 11 through the already reacted gas inlet manifold 21 provided in the intermediate plate 35, distributed to the temperature and humidity exchange cell 11a, and Go through,
Discharge.

On the other hand, hydrogen as a fuel gas passes through an unreacted gas inlet manifold 19 provided inside the end plate 30 on the opposite side of the oxidant supply port 31 and has a different temperature and humidity from the oxidant side. To the exchange part 11, furthermore, the intermediate plate 3
5 through the unreacted fuel gas inlet 41 to the cell section, and is distributed to each cell of the polymer electrolyte fuel cell stack 29. The high-temperature and high-humidity reacted hydrogen that has passed through the cell in the battery unit and reacted with the oxidant has been combined in the battery unit, and the reacted fuel gas recirculation port 43 at the end of the polymer electrolyte fuel cell stack 29. Further, the gas flows into the intermediate plate 35, is further led to the temperature / humidity exchange unit 11 through the already reacted gas inlet manifold 21 provided inside the intermediate plate 35, is distributed to the temperature / humidity exchange cell 11a, and has the already reacted gas outlet. Manifold 2
Discharge through 0.

The antifreeze as a coolant is supplied from a coolant supply port 34 provided in the end plate 30 on the side of the fuel gas supply port 33, passes through an inlet manifold provided inside the intermediate plate 35, and flows through the solid polymer. Of the fuel cell stack 29 to cool each cell. And
The antifreeze circulated in the battery unit is discharged through the outlet manifold and the coolant discharge port 39.

On the other hand, the present invention is not limited to this. For example, as shown in FIGS. 11 and 12, the antifreeze is supplied from a coolant supply port 34 provided in one intermediate plate 35, and is supplied through an inlet manifold. After leading to the polymer fuel cell stack 29 and cooling the cells, the cells may be discharged through the outlet manifold and the coolant discharge port 39 provided on the other intermediate plate 35.

The numbers of the temperature and humidity exchange cells 11a of the left and right temperature and humidity exchange units 11 do not necessarily have to match.
In particular, the temperature / humidity exchange unit 11 on the side of the fuel gas supply port 33 may increase or decrease the number of cells according to the initial humidity of the fuel gas used. That is, for example, when using pure hydrogen, the number of cells is substantially the same as that on the oxidant side, and when using hydrogen supplied from the reformer, the number of cells can be several.

The material of the intermediate plate 35 is the same as that of the first embodiment, and the description is omitted here.

Next, in the polymer electrolyte fuel cell system of the present embodiment configured as described above, the temperature and humidity exchange units 11 are provided on both sides of the polymer electrolyte fuel cell stack 29. It is possible to arrange the supply pipe and discharge pipe of the air as the oxidant and the supply pipe and the discharge pipe of the hydrogen as the fuel gas and the antifreeze as the coolant in the temperature and humidity exchange unit 11 located on the opposite sides. As a result, the piping group concentrated on the end plate on the side of the temperature-humidity exchange unit 11 which has been conventionally one is dissipated, and not only the degree of freedom of the piping is increased, but also the oxygen-hydrogen mixture inside the temperature-humidity exchange unit 11 is increased. The danger of is completely eliminated.

Further, it is only necessary to provide only one of the oxygen flow path and the hydrogen flow path in each temperature / humidity exchange cell 11a. In addition to the reduction in the number of processing steps, the temperature / humidity exchange area of the total cell area is reduced. It is possible to take large. That is,
When trying to obtain the same temperature / humidity exchange capacity, it is possible to reduce the size.

Furthermore, by providing the antifreeze supply pipe at an arbitrary position on one intermediate plate 35 and the discharge pipe at an arbitrary position on the other intermediate plate 35, the degree of freedom of piping at the end plate 30 is increased. The degree of freedom of installation of peripheral devices for the supply system, circulation system, and processing system of each fluid further increases, and the temperature / humidity exchange unit cell 11a can reduce the number of processing steps and increase the temperature / humidity exchange area. In addition to the compactness, it is possible to avoid cooling of the temperature / humidity exchange unit 11 that does not want to be cooled much because of the temperature dependence of the performance.

Further, the fuel gas is also supplied to the temperature / humidity exchange section 11.
In addition to the fact that pure hydrogen can be used as a fuel gas, high-density power is used so that the amount of humidification on the oxygen side is near the limit when hydrogen that has been humidified in advance is used. However, it can be used as a supplement.

(Fourth Embodiment: Corresponding to Claims 10 and 11) FIG. 13 is a bird's-eye view showing a configuration example of a polymer electrolyte fuel cell system according to this embodiment, and FIG. FIG. 3 is a vertical cross-sectional view showing a configuration example of a fuel cell system in which the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In the present embodiment, the cell section comprising the above-mentioned polymer electrolyte fuel cell stack 29 and the temperature / humidity exchange section 1
1 and a flow path configuration of air as an oxidizing gas, hydrogen as a fuel gas, and an antifreeze as a coolant (medium), and a polymer electrolyte fuel cell on both sides of the temperature / humidity exchange unit. The stacks are integrated one by one via two plates having at least one type of through-flow passage for communication of fuel gas, oxidizing gas, and coolant, and oxidized on the side of the temperature / humidity exchange unit that is not the plate contact surface. Having a supply pipe and a discharge pipe for the agent,
The polymer electrolyte fuel cell stack has a fuel gas supply pipe and a discharge pipe on the end face opposite to the plate contact face.

That is, as shown in FIG. 13, the polymer electrolyte fuel cell system is configured such that one battery unit is disposed on each side via the intermediate plate 35 at both ends of the temperature / humidity exchange unit 11 and integrated. And The temperature / humidity exchange unit 11 here has an oxidizing agent distribution plate 52 having a configuration as shown in FIG. 14 at a central portion in the cell stacking direction.

The oxidizing agent distribution plate 52 has an oxidizing agent supply port 31, and allows the unreacted oxidizing agent supplied into the plate to exchange the temperature and humidity exchange cells 11a disposed on the left and right sides of the plate.
Lead to.

Further, hydrogen as a fuel gas agent is supplied from the unreacted fuel gas supply port 33 provided in the end plate 30 or end plate 32 of the polymer electrolyte fuel cell stack 29 to the end plate 30 or end plate 32. It is guided into the polymer electrolyte fuel cell stack 29 through a fuel gas inlet manifold provided inside.

The supplied unreacted air is guided to the temperature / humidity exchange section 11 through the oxidizing agent distribution plate 52, and further to the battery section through the oxidizing agent inlet 40 of the intermediate plate 35, where the solid polymer is supplied. Of the fuel cell stack 29.

The reacted high-temperature, high-humidity air that has passed through the cells in the battery section and has completed the reaction merges in the battery section, and enters the intermediate plate 35 disposed at the end of the polymer electrolyte fuel cell stack 29. It is led from the oxidant reflux port 30 to the temperature / humidity exchange unit 11 through the already-reacted gas inlet manifold provided,
It is distributed to the temperature / humidity exchange cell 11a, and is discharged from the oxidant discharge port provided in the oxidant distribution plate 52.

Further, hydrogen as a fuel gas is supplied from an unreacted fuel gas supply port 33 provided inside the end plate 30 or the end plate 32 at the end of the battery section, and passes through the unreacted gas inlet manifold 19. It is led to the battery section and distributed to each cell of the polymer electrolyte fuel cell stack 29. The high-temperature, high-humidity reacted hydrogen that has passed through the cell in the battery unit and has completed the reaction with the oxidant merges in the battery unit, passes through the reacted gas outlet manifold 20, and passes through the reacted fuel gas outlet 37. And discharge.

On the other hand, the present invention is not limited to this. For example, as shown in FIGS. 15 and 16, the fuel gas is supplied to the unreacted fuel provided on the end plate 30 or the end plate 32 of the polymer electrolyte fuel cell stack 29. The gas is supplied from the gas supply port 33, is guided to the polymer electrolyte fuel cell stack 29 through the unreacted gas inlet manifold, and after passing through each cell, the reacted gas outlet manifold 20 provided on the intermediate plate 35, The discharge may be performed through the reacted fuel gas discharge port 37.

Further, the number of the polymer electrolyte fuel cell stacks 29 in the left and right cell sections does not necessarily have to be the same, and the left and right may be intentionally unbalanced.

The material of the intermediate plate 35 is the same as that of the first embodiment, and the description is omitted here.

Next, in the polymer electrolyte fuel cell system of the present embodiment configured as described above, the polymer electrolyte fuel cell stack 29 as a power generation unit is provided on both sides of the temperature / humidity exchange unit 11. With this arrangement, the supply pipe and the discharge pipe of the air as the oxidizing agent are connected to an arbitrary surface different from the contact surface of the intermediate plate 35 of the temperature / humidity exchange unit 11 with hydrogen as the fuel gas and antifreeze as the coolant. The supply pipe and the discharge pipe can be arranged on the end plate of the fuel cell stack 29, and the group of pipes that has been concentrated on the end plate on the side of the temperature / humidity exchange unit 11 which is conventionally only one is dissipated, and the Not only the degree of freedom is increased, but also the danger of oxygen-hydrogen mixing inside the temperature / humidity exchange unit is completely eliminated.

Further, the temperature and humidity exchange cell only needs to be provided with the oxygen passage channel alone, and in addition to reducing the number of processing steps, it is possible to increase the temperature and humidity exchange area of the entire cell area. . That is, when trying to obtain the same temperature / humidity exchange capability, it is possible to achieve compactness.

Furthermore, since the polymer electrolyte fuel cell stack 29 is divided into two parts on the left and right sides of the conventional fuel cell having the same output, unreacted oxidant gas flows into the temperature / humidity exchange unit 11. After passing through the battery unit and returning to the temperature exchanging unit 11 again, the time is about half. Therefore, even when the transient response of the output is required, the response is better than that of the related art. It will be possible to respond in less time.

Further, when it is not preferable that the supply port and the discharge port of the hydrogen and the coolant are concentrated on the same surface, the discharge port of the hydrogen or the coolant is provided on the intermediate plate 3.
By providing it in 5, the concentration of piping can be avoided, and the degree of freedom in piping and the degree of freedom in installing peripheral devices for the supply system, circulation system, and processing system of each fluid can be increased.

[0113]

As described above, in the polymer electrolyte fuel cell system of the present invention, the supply port and the discharge port of the oxidizing gas are on the temperature and humidity exchange section side, and the supply port and the discharge port of the fuel gas are solid. Since it is provided on the polymer battery stack side, concentration of piping can be avoided, piping flexibility can be improved, and the danger of oxygen-hydrogen mixing in the temperature and humidity exchange unit can be avoided. In addition to increasing the exchange area or reducing the size, the temperature / humidity exchange unit can be released from cooling, and the temperature / humidity exchange efficiency can be improved.

The material of the intermediate plate interposed between the temperature / humidity exchange unit and the polymer electrolyte fuel cell stack unit can be appropriately selected depending on which of weight saving, workability, strength, performance, cost reduction, etc. is emphasized. Thus, a polymer electrolyte fuel cell system suitable for each purpose can be obtained.

Further, since there are two temperature / humidity exchange units, pure hydrogen can be used as a fuel gas, and it is possible to obtain a polymer electrolyte fuel cell system having no reformer. Become.

Further, since the temperature / humidity exchange section is sandwiched by the battery section, in addition to the above effects,
A polymer electrolyte fuel cell system having excellent transient response can be obtained.

[Brief description of the drawings]

FIG. 1 is a bird's-eye view showing a first embodiment of a polymer electrolyte fuel cell system according to the present invention.

FIG. 2 is a longitudinal sectional view showing the first embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 3 is a diagram showing a configuration example of an intermediate plate in the polymer electrolyte fuel cell system according to the first embodiment;

FIG. 4 is a diagram showing another configuration example of the intermediate plate in the polymer electrolyte fuel cell system according to the first embodiment.

FIG. 5 is a diagram showing another configuration example of the intermediate plate in the polymer electrolyte fuel cell system according to the first embodiment.

FIG. 6 is a diagram showing another configuration example of the intermediate plate in the polymer electrolyte fuel cell system according to the first embodiment.

FIG. 7 is a bird's-eye view showing a second embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 8 is a vertical sectional view showing a second embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 9 is a bird's-eye view showing a third embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 10 is a vertical sectional view showing a third embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 11 is a bird's-eye view showing a modification of the third embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 12 is a longitudinal sectional view showing a modified example of the third embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 13 is a bird's-eye view showing a fourth embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 14 is a longitudinal sectional view showing a fourth embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 15 is a bird's-eye view showing a modification of the fourth embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 16 is a longitudinal sectional view showing a modification of the fourth embodiment of the polymer electrolyte fuel cell system according to the present invention.

FIG. 17 is a cross-sectional view illustrating a configuration example of a polymer electrolyte fuel cell stack.

FIG. 18 is an exploded perspective view showing a configuration example of a conventional polymer electrolyte fuel cell system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Anode electrode, 2 ... Cathode electrode, 3 ... Catalyst layer, 4 ... Solid polymer electrolyte membrane, 5 ... Single cell, 6 ... Separator, 7 ... Single cell laminated body, 8 ... Cooling plate, 9 ... Sealing material, 10 ... Battery part, 11 ... Temperature / humidity exchange part, 11a ... Temperature / humidity exchange cell, 19 ... Unreacted gas inlet manifold, 20 ... Reacted gas outlet manifold, 21 ... Reacted gas inlet manifold, 22 ... Unreacted gas outlet manifold 29: polymer electrolyte fuel cell stack, 30: end plate, 31: oxidant supply port, 32: end plate, 33: fuel gas supply port, 34: coolant supply port, 35: intermediate plate, 36: oxidant Reflux port, 37 ... fuel gas outlet, 38 ... oxidant outlet, 39 ... coolant outlet, 40 ... oxidant inlet, 41 ... fuel gas inlet, 42 ... coolant inlet, 4 ... Fuel gas recirculation port, 44 ... Coolant recirculation port, 45 ... Packing, 46 ... Heat insulation material, 47 ... Collecting electrode, 48 ... Current collecting plate, 49 ... Non-metal plate, 50 ... Metal plate, 51 ... Separator, 52 ... Oxidant distribution plate.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Soichiro Shimotori 1st Toshiba R & D Center, Komukai, Kawasaki-shi, Kanagawa Prefecture (72) Michiro Hori Inventor Komukai, Koyuki-ku, Kawasaki-shi, Kanagawa No. 1, Toshiba-cho, Toshiba R & D Center (72) Inventor Kazunori Shiota 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa F-Terminal, Toshiba Keihin Works Co., Ltd. 5H026 AA06 CC03 5H027 AA06 BC20 CC06

Claims (11)

[Claims] An electrochemical device comprising a solid polymer electrolyte membrane sandwiched between a pair of gas diffusion electrodes comprising a fuel electrode and an oxidant electrode with a catalyst layer interposed therebetween. A cell that generates electric power by generating a power by a reactive reaction, a gas-impermeable separator having a groove for supplying a fuel gas and an oxidant gas to the fuel electrode and the oxidant electrode, and a cooling medium flow therethrough. A polymer electrolyte fuel cell stack formed by laminating a plurality of cooling plates through a cooling plate, and a water-retentive porous material containing the oxidizing gas passing through the battery reaction portion and the oxidizing gas before passing through the battery reaction portion. A temperature-humidity exchange unit that performs heat exchange and humidity exchange by contacting through a body; and a plate having at least one type of through-flow passage for communication of the fuel gas, the oxidant gas, and the cooling medium, Minute The secondary fuel cell stack and the temperature / humidity exchange unit are integrated via the plate, and a supply pipe and a discharge pipe for the oxidant gas are provided on an end surface of the temperature / humidity exchange unit opposite to a plate contact surface. A polymer electrolyte fuel cell system comprising: a supply pipe and a discharge pipe for the fuel gas and the cooling medium provided on an end surface of the polymer electrolyte fuel cell stack opposite to a plate contact surface. 2. The solid polymer electrolyte fuel cell system according to claim 1, wherein said plate is formed of a metal plate such as stainless steel or aluminum coated with a corrosion-resistant coating. Polymer fuel cell system. 3. The polymer electrolyte fuel cell system according to claim 1, wherein the plate is formed of a plate made of a nonmetal such as a resin. Battery system. 4. The polymer electrolyte fuel cell system according to claim 1, wherein the plate is made of stainless steel or a corrosion-resistant coating on at least a cell side end surface of a plate made of a nonmetal such as resin. A polymer electrolyte fuel cell system comprising a multi-plate in which metal plates made of aluminum or the like are integrated. 5. The polymer electrolyte fuel cell system according to claim 1, wherein the plate is made of a material having a thermal conductivity of less than 10 W / mK. Fuel cell system. 6. The polymer electrolyte fuel cell system according to claim 1, wherein the plate is made of the same material as a separator constituting the polymer electrolyte fuel cell stack, and has at least the same outer shape. A polymer electrolyte fuel cell system. 7. A solid polymer electrolyte membrane is sandwiched between a pair of gas diffusion electrodes composed of a fuel electrode and an oxidant electrode via a catalyst layer. A cell that generates electric power by generating a power by a reactive reaction, a gas-impermeable separator having a groove for supplying a fuel gas and an oxidant gas to the fuel electrode and the oxidant electrode, and a cooling medium flow therethrough. A polymer electrolyte fuel cell stack formed by laminating a plurality of cooling plates through a cooling plate, and a water-retentive porous material containing the oxidizing gas passing through the battery reaction portion and the oxidizing gas before passing through the battery reaction portion. A temperature-humidity exchange unit that performs heat exchange and humidity exchange by contacting through a body; and a plate having at least one type of through-flow passage for communication of the fuel gas, the oxidizing gas, and the cooling medium, Minute The secondary fuel cell stack and the temperature / humidity exchange unit are integrated via the plate, and the plate is provided with the fuel gas supply pipe on an end surface opposite to a plate contact surface of the polymer electrolyte fuel cell stack. A polymer electrolyte fuel cell system comprising a discharge pipe on a side surface of a plate portion. 8. The electrochemical reaction of a fuel gas and an oxidant gas in a battery reaction part, wherein a solid polymer electrolyte membrane is sandwiched between a pair of gas diffusion electrodes composed of a fuel electrode and an oxidant electrode via a catalyst layer. A cell that generates electric power by generating a power by a reactive reaction, a gas-impermeable separator having a groove for supplying a fuel gas and an oxidant gas to the fuel electrode and the oxidant electrode, and a cooling medium flow therethrough. A polymer electrolyte fuel cell stack formed by laminating a plurality of cooling plates through a cooling plate, and a water-retentive porous material containing the oxidizing gas passing through the battery reaction portion and the oxidizing gas before passing through the battery reaction portion. Two temperature / humidity exchanging sections that are brought into contact with each other through a body to perform heat exchange and humidity exchange, and two plates having at least one kind of through-flow passage for communication of the fuel gas, the oxidizing gas, and the cooling medium are provided. , The temperature / humidity exchange units are integrated one on each side of the polymer electrolyte fuel cell stack via the plate, and the oxidant gas is provided on the side of the one temperature / humidity exchange unit that is not the plate contact surface. A solid pipe comprising: a supply pipe and a discharge pipe; and a supply pipe and a discharge pipe for the fuel gas and the cooling medium on a side surface other than a plate contact surface of the other temperature and humidity exchange unit. Molecular fuel cell system. 9. The polymer electrolyte fuel cell system according to claim 8, further comprising a supply pipe for the cooling medium on a supply pipe side of the fuel gas, wherein the supply pipe for the cooling medium is farther from the supply pipe for the fuel gas. A polymer electrolyte fuel cell system comprising a plate having a discharge pipe. 10. A solid polymer electrolyte membrane is sandwiched between a pair of gas diffusion electrodes comprising a fuel electrode and an oxidant electrode via a catalyst layer, and the electrochemical reaction of the fuel gas and the oxidant gas in the battery reaction part is performed. A cell that generates electric power by generating a power by a reactive reaction, a gas-impermeable separator having a groove for supplying a fuel gas and an oxidant gas to the fuel electrode and the oxidant electrode, and a cooling medium flow therethrough. A plurality of polymer electrolyte fuel cell stacks formed by stacking a plurality of cooling plates via a cooling plate, and an oxidizing gas that has passed through the battery reaction section and an oxidizing gas that has not passed through the battery reaction section. A temperature-humidity exchange unit that performs heat exchange and humidity exchange by contacting through a porous body; and two plates having at least one type of through-flow passage for communication of the fuel gas, the oxidizing gas, and the cooling medium. The polymer electrolyte fuel cell stacks are integrated one by one on both sides of the temperature and humidity exchanging unit via the plate, and a supply pipe for the oxidizing agent is provided on a side surface other than the plate contact surface of the temperature and humidity exchanging unit. A polymer electrolyte fuel cell system, comprising: a discharge pipe; and a supply pipe and a discharge pipe for the fuel gas on an end surface opposite to a plate contact surface of the polymer electrolyte fuel cell stack. . 11. The polymer electrolyte fuel cell system according to claim 10, further comprising a fuel gas supply pipe on an end surface of the polymer electrolyte fuel cell stack opposite to a plate contact surface, wherein the fuel gas supply pipe is provided. A polymer electrolyte fuel cell system having a discharge pipe on a side surface.