JP4957091B2 - Fuel cell - Google Patents

Description

  The present invention relates to an internal structure of a fuel cell.

  As a document showing the internal structure of a fuel cell that generates electricity by receiving supply of hydrogen and oxygen as a kind of reaction gas, for example, there is Patent Document 1 below. In Patent Document 1, a gasket, which is an elastic body, is integrally formed by injection molding around a solid polymer electrolyte membrane in which an oxidant electrode and a fuel electrode are bonded on both sides. This electrolyte membrane is combined with hydrogen or oxygen. Discloses a structure in which a fuel cell is configured by stacking a plurality of cells including a separator formed with a flow path through which the gas flows.

JP 2001-102072 A

  In the fuel cell described in Patent Document 1 having such a structure, in order to prevent the reaction gas from flowing from the manifold to the gas supply passage from being blocked by the deformation of the gasket integrally formed on the electrolyte membrane, Means are provided to reinforce the structure by providing a lid on the back side of the protrusion of the gasket.

  However, referring to FIG. 1 of Patent Document 1, even if a cover is provided on the back of the gasket, there is still a space on the back of the gasket, so depending on the pressing force that holds the fuel cell in the stacking direction, There was a possibility that the inlet of the gas supply passage would be crushed.

  In view of such problems, the problem to be solved by the present invention is to reinforce the portion for introducing the reaction gas into the fuel cell with a simple configuration.

Based on the above problems, the fuel cell of the present invention is configured as follows. That is,
A fuel cell having a power generation layer that generates power by receiving supply of a reaction gas,
A conductive gas diffusion layer disposed on both sides of the power generation layer and supplying the reaction gas to the power generation layer by circulating the reaction gas therein;
The gas diffusion layer is disposed on a surface opposite to the surface on which the power generation layer is disposed, and collects current generated by the power generation by the power generation layer via the gas diffusion layer, and in the gas diffusion layer First and second separators that serve as partition walls for the reaction gas flowing through
A seal portion that is formed on the outer periphery of the power generation layer so as to be in contact with the first separator and seals the gas diffusion layer disposed between the power generation layer and the first separator;
The gas diffusion layer disposed between the seal portion and the second separator, made of a porous body having higher rigidity than the seal portion, and disposed between the second separator and the power generation layer. In contrast, the present invention includes a gas introduction part for introducing the reaction gas.

  In the fuel cell of the present invention, a porous body having a rigidity higher than that of the seal portion is disposed on the opposite side (second separator side) of the seal portion in contact with the first separator. Therefore, even if the seal portion is deformed by the pressing force in the stacking direction of the fuel cell, the deformation is hindered by the porous body. Therefore, with such a configuration, it is possible to prevent the gas introduction unit from being blocked with a relatively simple configuration.

  In addition, according to the present invention, since the gas introduction part made of a porous body and the gas diffusion layer for supplying the reaction gas to the power generation layer can be arranged on the same plane, the reaction gas can be smoothly introduced into the fuel cell. It becomes possible to introduce. Furthermore, with such a configuration, the reactive gas can be efficiently supplied to the end of the power generation layer, so that the area utilization factor of the power generation layer can be improved and the power generation efficiency can be increased.

In the fuel cell having the above configuration,
The gas diffusion layer is made of a porous body having higher rigidity than the seal part,
The gas introduction part may be formed as a part of the porous body that forms the gas diffusion layer disposed between the power generation layer and the second separator.

  With such a structure, the gas introduction part and the gas diffusion layer can be formed of the same member, so that the number of parts can be reduced and the structure can be further simplified.

In the fuel cell having the above configuration,
The gas introduction part introduces the reaction gas from a predetermined manifold formed through the first and second separators and the seal part,
The gas introduction part may be formed by extending the porous body into the manifold.

  With such a configuration, even if the cross section of the end portion is crushed by the cutting process in the manufacturing process of the porous body forming the gas introduction portion, the reaction gas is introduced into the fuel cell from the planar portion protruding into the manifold. Can be introduced. Therefore, it is possible to improve the yield when manufacturing the fuel cell.

In the fuel cell having the above-described configuration, the first separator is a reactive gas supply flow for supplying a part of the reactive gas to an end portion of the gas diffusion layer sandwiched between the power generation layer and the first separator. It is good also as what has the path inside.

  With such a configuration, the reaction gas can be efficiently supplied to both surfaces of the power generation layer.

In such a configuration,
In the reaction gas supply channel, a part of the reaction gas flows in a direction parallel to the direction in which the reaction gas flows in the gas diffusion layer sandwiched between the power generation layer and the second separator. A part of the reaction gas may be supplied to the end portion.

  With such a configuration, since the reaction gas flows in parallel on both sides of the power generation layer, the region where the electrochemical reaction occurs is expanded, and it is possible to efficiently generate power.

Furthermore, in such a configuration,
In the reaction gas supply channel, a part of the reaction gas flows in a direction parallel to and opposite to the direction in which the reaction gas flows in the gas diffusion layer sandwiched between the power generation layer and the second separator. Thus, a part of the reaction gas may be supplied to the end portion.

  With such a configuration, since the reaction gas flows in parallel and in opposite directions on both sides of the power generation layer, the water generated on the cathode side of the power generation layer leaks to the anode side and then moves to the cathode side again. It is promoted. As a result, the wet state of the power generation layer can be easily maintained, and the power generation efficiency can be improved.

Hereinafter, in order to further clarify the operations and effects of the present invention described above, embodiments of the present invention will be described based on examples in the following order.
A. Schematic configuration of fuel cell:
B. Detailed configuration of the fuel cell:
C. Seal configuration:
D. Gas separator configuration:
E. effect:
F. Variations:

A. Schematic configuration of fuel cell:
FIG. 1 is an explanatory diagram showing a schematic configuration of a fuel cell 100 as an embodiment of the present invention. The fuel cell 100 is a solid polymer type fuel cell that generates power by receiving supply of hydrogen and oxygen as reaction gases, and is configured by laminating a plurality of fuel cell modules 110 including single cells and gas separators. . A current collecting plate 120, an insulating plate 130, and an end plate 140 are respectively disposed at both ends of a laminate composed of a plurality of fuel cell modules 110. Two end plates 140 located at both ends are connected to each other by a tension plate 150. That is, the fuel cell 100 is structured to be held by the tension plate 150 with a predetermined pressing force in the stacking direction.

  Inside the fuel cell 100, a fuel gas supply manifold 200 for supplying hydrogen as a fuel gas, a fuel gas discharge manifold 205 for discharging the fuel gas, and air containing oxygen as an oxidizing gas are supplied. An oxidizing gas supply manifold 210 for discharging, an oxidizing gas discharge manifold 215 for discharging this, a cooling medium supply manifold 220 for supplying water as a cooling medium, and a cooling medium discharge manifold 225 for discharging this are formed. ing.

  A hydrogen tank 300 for storing high-pressure hydrogen is connected to the fuel gas supply manifold 200 described above, and an anode off-gas discharge pipe 310 is connected to the fuel gas discharge manifold 205. The oxidizing gas supply manifold 210 is connected to a compressor 320 that supplies compressed air, and the oxidizing gas discharge manifold 215 is connected to a cathode offgas discharge pipe 330. A circulation pump 340 for circulating water as a cooling medium and a radiator 350 are connected to the cooling medium supply manifold 220 and the cooling medium discharge manifold 225.

B. Detailed configuration of the fuel cell:
FIG. 2 is an explanatory diagram showing a detailed configuration of the fuel cell 100. This figure shows a part of a cross section of the fuel cell 100 where the oxidizing gas supply manifold 210 and the oxidizing gas discharge manifold 215 are formed. The cross section of the portion where the fuel gas supply manifold 200 and the fuel gas discharge manifold 205 are formed has substantially the same configuration.

  As shown in FIG. 2, the fuel cell 100 of the present embodiment is configured by alternately stacking single cells 20 and gas separators 30. Each single cell 20 includes an MEA (Membrane Electrode Assembly) 21, an anode-side porous body 25, and a cathode-side porous body 26 in which a seal portion 27 is integrally formed on the outer periphery.

  The MEA 21 is formed by forming catalyst electrode layers 23 (anode and cathode) on both surfaces of the electrolyte membrane 22, and in this embodiment, a carbon porous layer 24 is further formed on both surfaces thereof. This MEA 21 corresponds to the “power generation layer” of the present application. The electrolyte membrane 22 is a thin film of a solid polymer material that exhibits good electrical conductivity in a wet state, and is formed of, for example, a proton conductive ion exchange membrane made of a fluororesin having perfluorocarbon sulfonic acid. The catalyst electrode layer 23 is a catalyst that promotes an electrochemical reaction, and is formed of platinum or an alloy containing platinum. The carbon porous layer 24 is formed of a porous material having conductivity and gas permeability such as carbon cloth and carbon paper.

  An anode side porous body 25 and a cathode side porous body 26 are disposed on both surfaces of the MEA 21 as gas diffusion layers. The porous bodies 25 and 26 are porous members having electrical conductivity and gas permeability. For example, a sintered foam metal made of a metal such as titanium or a spherical or fibrous fine metal is sintered. It is formed of a sintered body. The cathode side porous body 26 supplies the air supplied through the oxidizing gas supply manifold 210 to the cathode of the MEA 21, and the anode side porous body 25 converts the hydrogen supplied through the fuel gas supply manifold 200 (not shown) into the MEA 21. To the anode. Since the porous bodies 25 and 26 are intended to flow a reaction gas along the surface direction of the MEA 21, the porous bodies 25 and 26 are formed to have a higher internal porosity than the carbon porous layers 24 disposed on both surfaces of the MEA 21. The porous bodies 25 and 26 are members having higher rigidity than the seal portion 27.

  The MEA 21 is integrally provided with a seal portion 27 on the outer peripheral portion thereof. A through hole 41 and a through hole 42 are formed in a part of the seal portion 27. The through hole 41 and the through hole 51 provided in the gas separator 30 form the oxidizing gas supply manifold 210, and the through hole 42 forms the oxidizing gas discharge manifold 215 together with the through hole 52 provided in the gas separator 30. . A plurality of convex portions are provided around the through hole 41 and the through hole 42 of the seal portion 27 so as to contact the adjacent gas separator 30. The seal portion 27 is made of an insulating resin material having elasticity such as silicon rubber, butyl rubber, or fluorine rubber. The seal portion 27 is brought into close contact with the adjacent gas separator 30 at the position of the seal line SL indicated by a one-dot chain line in FIG. 2 by applying a pressing force in the stacking direction by the tension plate 150 shown in FIG. Gas sealing performance is realized. The seal part 27 can be formed integrally with the MEA 21 by, for example, arranging the MEA 21 so that the outer peripheral part of the MEA 21 is accommodated in the cavity of the mold forming the seal part 27 and injection molding the resin material. .

  As shown in FIG. 2, a part of the cathode-side porous body 26 described above passes through the back side of the convex portion of the seal portion 27 and extends to the position of the through hole 41. In the following description, this stretched part is referred to as “gas introduction part 60”. According to such a structure, the air flowing through the oxidizing gas supply manifold 210 flows into the cathode-side porous body 26 through the gas introduction part 60 on the back side of the convex part of the seal part 27. 2 shows a cross section of a portion where the oxidizing gas supply manifold 210 and the oxidizing gas discharge manifold 215 are formed, but the same applies to the portion where the fuel gas supply manifold 200 and the fuel gas discharge manifold 205 are formed. This is the structure. Therefore, the hydrogen flowing through the fuel gas supply manifold 200 flows into the anode side porous body 25 through the gas introduction part formed by extending the anode side porous body 25 to the fuel gas supply manifold 200.

  The gas separator 30 is a metal plate member that serves as a partition wall for the reaction gas flowing through the porous bodies 25 and 26. The gas separator 30 also has a function of collecting current generated by power generation of the single cell 20. The gas separator 30 includes an intermediate plate 34, an anode side plate 31 in contact with the anode side porous body 25, and a cathode side plate 33 in contact with the cathode side porous body 26, and the intermediate plate 34 is connected to the anode side plate 31. A structure sandwiched between the cathode side plate 33 is adopted. The intermediate plate 34 is provided with a comb-like cutout, and the refrigerant flow path 32 is formed thereby. Water for cooling the fuel cell 100 is supplied to the coolant channel 32 from a cooling medium supply manifold 220 (not shown). At end portions of the gas separator 30, through holes 51 and 52 that constitute the oxidizing gas supply manifold 210 and the oxidizing gas discharge manifold 215 are formed at positions corresponding to the through holes 41 and 42 of the seal portion 27. In FIG. 2, the gas separator 30 arranged on the anode side (left side in the figure) of the MEA 21 corresponds to the first separator of the present application, and the gas separator arranged on the cathode side (right side in the figure) of the MEA 21. 30 corresponds to the second separator.

C. Seal configuration:
3 and 4 are explanatory views showing a detailed configuration of the seal portion 27. FIG. Among these, FIG. 3 shows the structure of the surface in contact with the cathode side plate 33, and FIG. 4 shows the structure of the surface in contact with the anode side plate 31. The cross section of the MEA 21 shown in FIG. 2 corresponds to the cross section taken along the line AA shown in FIGS.

  As shown in FIGS. 3 and 4, the outer shape of the seal portion 27 is a substantially square shape, and the MEA 21 is disposed at the center. A plurality of rectangular through holes are provided around the MEA 21 (through holes 41 to 46). These through holes 41 to 46 penetrate through the fuel cell in the stacking direction when the gas separator 30 and the single cell 20 are stacked, and form a part of a manifold through which a predetermined fluid flows. Specifically, the through hole 41 forms an oxidizing gas supply manifold 210 through which air as an oxidizing gas flows, and the through hole 42 forms an oxidizing gas discharge manifold 215 that discharges the cathode off-gas. The through-hole 43 forms a fuel gas supply manifold 200 through which hydrogen as a fuel gas flows, and the through-hole 44 forms a fuel gas discharge manifold 205 that discharges anode off-gas. The through hole 45 forms a cooling medium supply manifold 220 through which water as a cooling medium flows, and the through hole 46 forms a cooling medium discharge manifold 225 that discharges this water.

  As shown in FIG. 2, the seal portion 27 has a convex portion around the through hole 41 and the like. In FIG. 3 and FIG. 4, this convex portion is indicated by a thick line labeled “seal line SL”.

  As shown in FIG. 3, the seal line SL is formed around the through hole 43, the through hole 44, the through hole 45, and the through hole 46 on the surface of the seal portion 27 that contacts the cathode side plate 33 without any gap. . Therefore, hydrogen as the fuel gas and water as the cooling medium do not flow into the surface shown in FIG. 3, that is, the cathode side of the MEA 21.

  On the other hand, the seal line SL is not provided around the through hole 41 and the through hole 42 shown in FIG. 3 only in the direction of the MEA 21 side. Therefore, air flows in from the through hole 41 along the cathode side surface of the MEA 21, and the air discharged from the cathode is discharged to the outside through the through hole 42 as the cathode off gas. Since the air flowing in from the through hole 41 flows in the cathode side porous body 26, the outer shape of the cathode side porous body 26 is shown by broken lines in FIG. As shown in the drawing, the upper and lower ends of the cathode side porous body 26 extend beyond the shape of the MEA 21 toward the through hole 41 and the through hole 42. The portion thus extended corresponds to the gas introduction part 60 shown in FIG.

  On the other hand, as shown in FIG. 4, the seal line SL is formed around the through hole 41, the through hole 42, the through hole 45, and the through hole 46 on the surface in contact with the anode side plate 31 of the seal portion 27. ing. Therefore, the air as the oxidizing gas and the water as the cooling medium do not flow into the surface shown in FIG. 3, that is, the anode side of the MEA 21.

  On the other hand, the seal line SL is not provided around the through hole 43 and the through hole 44 shown in FIG. 4 only in the direction of the MEA 21 side. Accordingly, hydrogen flows in from the through hole 43 along the anode side surface of the MEA 21, and hydrogen that cannot be supplied to the anode and impurities that have permeated from the cathode are discharged through the through hole 44 as anode off-gas. become. Since hydrogen flowing in from the through holes 43 flows through the anode-side porous body 25, the outer shape of the anode-side porous body 25 is shown by broken lines in FIG. As illustrated, a part of the anode-side porous body 25 extends toward the through hole 43 and the through hole 44.

D. Gas separator configuration:
5 and 6 are explanatory diagrams showing the detailed configuration of the gas separator 30. FIG. Among these, FIG. 5 shows a planar structure of the anode side plate 31 and the cathode side plate 33, and FIG. 6 shows a planar structure of the intermediate plate 34.

  As shown in FIG. 5, the anode side plate 31 and the cathode side plate 33 are formed with through holes 51 to 56 at positions corresponding to the through holes 41 to 46 of the MEA 21 shown in FIGS. 3 and 4. Yes. Various manifolds are formed by these through holes.

  As shown in FIG. 6, a comb-like cutout C is provided at the center of the intermediate plate 34. The vertical width of the notch C is substantially the same as the vertical width of the through holes 55 and 56 of the anode side plate 31 and the cathode side plate 33, and the horizontal width thereof is the anode side plate 31 (and the cathode side plate 33). This corresponds to the width connecting the through hole 55 and the through hole 56.

  When the intermediate plate 34 is sandwiched between the anode side plate 31 and the cathode side plate 33 to form the gas separator 30, hydrogen and air simply pass through the gas separator 30 through any of the through holes 51 to 54. The water that has passed through the anode side plate 31 or the cathode side plate 33 through the through hole 55 flows through the cutout portion C of the intermediate plate 34 and is discharged through the through hole 56 on the opposite side. It will be. According to the gas separator 30 having such a structure, the fuel cell 100 can be efficiently cooled by water passing through the inside.

E. effect:
In the fuel cell 100 of this embodiment described above, as shown in FIG. 2, from the back side of the convex portion of the seal portion 27 provided around the MEA 21, that is, from the oxidizing gas supply manifold 210 and the fuel gas supply manifold 200. The porous bodies 25 and 26 having higher rigidity than the seal portion 27 are disposed in the gas introduction portion 60 through which the reaction gas flows into the MEA 21. Therefore, even if the fuel cell 100 is held with a predetermined pressing force by the tension plate 150 or the like, the back side of the convex portion of the seal portion 27 is backed up by the porous bodies 25 and 26, and a good sealing property is obtained. Can be secured.

  Further, in this embodiment, the porous bodies 25 and 26 as the gas diffusion layer and the gas introduction part 60 are integrally formed, so that the number of parts of the fuel cell 100 is reduced. Further, with such a structure, since the gas introduction part and the gas diffusion layer can be arranged on the same plane, the reaction gas can be smoothly introduced into the fuel cell through each manifold. In addition, since the areas of the porous bodies 25 and 26 can be formed larger than the area of the MEA 21 by the area of the gas introduction part, the area utilization factor of the MEA 21 can be improved and the power generation efficiency can be increased. .

F. Variations:
As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention is not limited to such an Example, and can take a various structure in the range which does not deviate from the meaning. For example, the following modifications are possible.

(F1) Modification 1:
FIG. 7 is an explanatory diagram showing a first modification of the fuel cell 100. In the fuel cell 100 in this modification, the end of the cathode-side porous body 26 is extended to the inside of the oxidizing gas supply manifold 210 and the inside of the oxidizing gas discharge manifold 215. Of course, it is assumed that the end of the anode-side porous body 25 also extends into the fuel gas supply manifold 200 and the fuel gas discharge manifold 205. With such a configuration, even if the end portion is crushed by the cutting process in the manufacturing process of the porous bodies 25 and 26, the reaction gas is satisfactorily supplied to the MEA 21 by the planar portion protruding into the manifold. be able to.

(F2) Modification 2:
FIG. 8 is an explanatory view showing a second modification of the fuel cell 100. The left side of FIG. 8 shows a cross section of the unit cell 20 and the gas separator 30b in this modification, and the right side of the figure shows a plan view of the anode side plate 31b constituting the gas separator 30b.

  As shown on the left side of FIG. 8, in this modification, not only the refrigerant flow path 32 but also a hydrogen flow path 36 through which hydrogen flows is formed inside the gas separator 30b. Further, as shown on the right side of the figure, a plurality of supply holes 37 for supplying hydrogen to the end portion of the anode-side porous body 25 are linearly arranged in the anode-side plate 31b constituting the gas separator 30b. ing. In addition, a plurality of discharge holes 38 for discharging the anode off gas are arranged in a straight line in the anode side plate 31 b, similarly to the supply holes 37.

  FIG. 9 is an explanatory diagram showing a schematic structure of the anode side plate 31b in the present modification. As shown in the figure, in this modification, the anode side plate 31b has a supply hole 37 for supplying hydrogen to the anode side porous body 25 and a discharge for discharging the anode off gas from the anode side porous body 25. The holes 38 are linearly arranged in parallel with the through holes 51 (and the through rows 52) constituting the oxidizing gas supply manifold 210, respectively.

  FIG. 10 is an explanatory diagram showing a schematic structure of the intermediate plate 34b constituting the gas separator 30b. The intermediate plate 34b is provided with through holes that constitute the hydrogen flow path 36 at positions corresponding to the supply holes 37 and the discharge holes 38 shown in FIG. A width of the through hole corresponding to the supply hole 37 is secured to a position corresponding to the through hole 53 constituting the fuel gas supply manifold 200. Further, the width of the through hole corresponding to the discharge hole 38 is secured to the position corresponding to the through hole 54 constituting the fuel gas discharge manifold 205.

  FIG. 11 is an explanatory view showing a schematic structure of the cathode side plate 33b constituting the gas separator 30b. As shown in the figure, the cathode side plate 33b is not particularly provided with the supply holes 37 and the discharge holes 38 as shown in FIG. 9, and only the through holes 51 to 56 constituting various manifolds are formed.

  When the plates shown in FIGS. 9 to 11 are stacked, as shown in FIG. 8, the gas separator 30b having the refrigerant flow path 32 and the hydrogen flow path 36 is formed.

  According to the second modification described above, hydrogen and oxygen can be allowed to flow in parallel across the MEA 21. In particular, if hydrogen and oxygen are allowed to flow in parallel from opposite directions as shown in FIG. 8, while water generated on the cathode side accompanying the electrochemical reaction proceeds toward the oxidizing gas discharge manifold 215, Through the MEA 21, it gradually leaks to the anode side. Then, the water leaking to the anode side is carried to the oxidizing gas supply manifold 210 side by hydrogen traveling in the opposite direction to the air, and thus the water returned to the oxidizing gas supply manifold flows to the cathode side again. Become. That is, according to the configuration of this modification, it is possible to keep the wet state of the MEA 21 well without requiring much air humidification. Therefore, the power generation efficiency is improved.

  In this modification, hydrogen is supplied to the anode side porous body 25 through the flow path in the gas separator 30, but oxygen is supplied to the cathode side porous body 26 through this flow path. It is good also as a structure to supply.

(F3) Modification 3:
In the embodiment described above, the seal portion 27 integrally formed with the MEA 21 is formed of an elastic material, and the seal portion 27 is attached to the adjacent gas separator 30 by the pressing force in the stacking direction by the tension plate 150. It was installed and assumed to exhibit gas sealing properties. However, the seal portion 27 may be bonded to the adjacent gas separator 30 with a predetermined adhesive regardless of such pressing force. In this case, the seal portion 27 does not need to have elasticity, and may be formed of an insulating material other than rubber.

2 is an explanatory diagram showing a schematic configuration of a fuel cell 100. FIG. 2 is a cross-sectional view showing a detailed configuration of a fuel cell 100. FIG. FIG. 5 is an explanatory diagram showing a detailed configuration of a seal portion 27. FIG. 5 is an explanatory diagram showing a detailed configuration of a seal portion 27. 4 is an explanatory diagram showing a detailed configuration of a gas separator 30. FIG. 4 is an explanatory diagram showing a detailed configuration of a gas separator 30. FIG. FIG. 6 is an explanatory diagram showing a first modification of the fuel cell 100. 6 is an explanatory diagram showing a second modification of the fuel cell 100. FIG. It is explanatory drawing which shows schematic structure of the anode side plate 31b. It is explanatory drawing which shows schematic structure of the intermediate | middle plate 34b. It is explanatory drawing which shows schematic structure of the cathode side plate 33b.

Explanation of symbols

20 ... single cell 21 ... MEA
DESCRIPTION OF SYMBOLS 22 ... Electrolyte membrane 23 ... Catalyst electrode layer 24 ... Carbon porous layer 25 ... Anode side porous body 26 ... Cathode side porous body 27 ... Seal part 30 ... Gas separator 31 ... Anode side plate 32 ... Refrigerant flow path 33 ... Cathode side plate 34 ... Intermediate plate 36 ... Hydrogen flow path 37 ... Supply hole 38 ... Discharge hole 60 ... Gas introduction part 100 ... Fuel cell 110 ... Fuel cell module 120 ... Current collecting plate 130 ... Insulating plate 140 ... End plate 150 ... Tension plate 200 ... Fuel gas supply manifold 205 ... Fuel gas discharge manifold 210 ... Oxidation gas supply manifold 215 ... Oxidation gas discharge manifold 220 ... Cooling medium supply manifold 225 ... Cooling medium discharge manifold 300 ... Hydrogen tank 310 ... Anode off gas discharge pipe 320 ... Compressor 33 ... cathode off-gas discharge pipe 340 ... circulation pump 350 ... radiator

Claims (6)

A fuel cell having a power generation layer that generates power by receiving supply of a reaction gas,
A conductive gas diffusion layer disposed on both sides of the power generation layer and supplying the reaction gas to the power generation layer by circulating the reaction gas therein;
The gas diffusion layer is disposed on a surface opposite to the surface on which the power generation layer is disposed, and collects current generated by the power generation by the power generation layer via the gas diffusion layer, and in the gas diffusion layer First and second separators that serve as partition walls for the reaction gas flowing through
A seal portion that is formed on the outer periphery of the power generation layer so as to be in contact with the first separator and seals the gas diffusion layer disposed between the power generation layer and the first separator;
The gas diffusion layer disposed between the seal portion and the second separator, made of a porous body having higher rigidity than the seal portion, and disposed between the second separator and the power generation layer. And a gas introduction part for introducing the reaction gas. The fuel cell according to claim 1,
The gas diffusion layer is made of a porous body having higher rigidity than the seal part,
The gas introduction part is formed as a part of the porous body that forms the gas diffusion layer disposed between the power generation layer and the second separator. The fuel cell according to claim 1 or 2, wherein
The gas introduction part introduces the reaction gas from a predetermined manifold formed through the first and second separators and the seal part,
The gas introduction part is formed by extending the porous body into the manifold. A fuel cell according to any one of claims 1 to 3,
The first separator includes a reaction gas supply channel for supplying a part of the reaction gas to an end portion of the gas diffusion layer sandwiched between the power generation layer and the first separator. A fuel cell. The fuel cell according to claim 4, wherein
In the reaction gas supply channel, a part of the reaction gas flows in a direction parallel to the direction in which the reaction gas flows in the gas diffusion layer sandwiched between the power generation layer and the second separator. A fuel cell that supplies a part of the reaction gas to the end. The fuel cell according to claim 5, wherein
The reaction gas supply channel has a part of the reaction gas in a direction parallel and opposite to a direction in which the reaction gas flows in the gas diffusion layer sandwiched between the power generation layer and the second separator. A fuel cell that supplies a part of the reaction gas to the end so as to flow.

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