JP2001291522A - Fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell which is light-weight, small-sized and inexpensive and in which there is no fear of leakage of fuel gas, oxidizer gas and cooling water. SOLUTION: This fuel cell is light-weight and inexpensive in respect of materials by forming separators 20 (A, B, C) which are main configuration members of the fuel cell, using press plates 21, 22 (A, B, C) made of metal and frames 23 to 25 made of resin. The productivity is enhanced by making welding of junctions between the mutual metal press plates 21, 22 unnecessary. The leakage of gas and cooling water from a fuel gas passage, an oxidized gas passage and a cooling water passage are surely prevented by making sure of airtight junction between the press plates 21, 22 and the frames 23 to 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fuel cell using a fuel gas and an oxidizing gas as reaction gases.

[0002]

2. Description of the Related Art As one type of a fuel cell using a fuel gas and an oxidizing gas as reaction gases, a joined body formed by joining electrodes on both surfaces of an electrolyte membrane is sandwiched between a first separator and a second separator. There is a fuel cell having one or a plurality of configured cell functional units. In a fuel cell of this type, for example, the first separator forms a fuel gas flow path through which fuel gas flows on one surface side of the assembly,
The second separator forms an oxidizing gas flow path through which the oxidizing gas flows on the other surface side of the joined body, and both separators form a cooling water flow path through which cooling water is supplied to the joining side of each other. In the battery function unit, power is generated by an oxidation-reduction reaction between the fuel gas and the oxidizing gas, and the generated power is led to the outside, for example, through a current collector plate located on the outermost side. Have been.

[0003] By the way, each separator constituting a conventional fuel cell of this type uses a carbon plate as a forming material, and has a large number of grooves constituting a fuel gas flow path, an oxidizing gas flow path, and a cooling water flow path. In order to form the carbon plate, a carbon plate in which grooves are machined on both sides is employed. As the carbon plate, a sintered carbon plate impregnated with a phenol resin, or a resin-molded carbon plate is used.
Such separators are heavy in material and extremely expensive in terms of material and processing costs, and the use of a large number of such separators increases the weight and cost of fuel cells of this type. Is a factor that leads to

To cope with this, a fuel cell intended to reduce the cost by forming each separator by a metal plate to reduce the cost is disclosed in Japanese Patent Application Laid-Open No. Hei 10-233220. It has been proposed. The fuel cell employs two types of structures each formed by laser beam welding a plurality of metal plates as a non-cooling separator and a cooling separator, respectively.

The non-cooled separator comprises a metal press plate formed into an uneven shape by press working, and two metal mask plates joined on both sides of the press plate. The plates are joined by laser beam welding at the joining surfaces of the plates.

The cooling separator is formed of a metal flat plate, two metal press plates formed into an uneven shape by press working and bonded to both sides of the flat plate, and bonded on the outer surface side of each press plate. It is composed of two metal mask plates, and is joined by laser beam welding at the joining surface of the flat plate, each press plate, and each mask plate.

[0007]

Each of these separators uses a metal plate as a forming material, and is lightweight and inexpensive in material. The forming material is formed by press forming, laser beam welding, or the like. It is constructed by performing, and is inexpensive in terms of processing. Therefore, a fuel cell using these separators as constituent members has an advantage that it can be provided lighter and cheaper than a conventional fuel cell using a carbon plate as a separator.

However, each separator constituting the fuel cell includes a press plate, a mask plate,
In addition, the flat plate, each press plate, and each mask plate are joined by laser beam welding at a large number of joint surfaces, and the productivity is low, and the fuel gas, oxidant gas, cooling Water leakage is inevitable.

Accordingly, it is an object of the present invention to provide a fuel cell which is lightweight, small, inexpensive, and free from leakage of fuel gas, oxidizing gas and cooling water.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a fuel cell using a fuel gas and an oxidizing gas as reaction gases. The fuel cell according to the present invention is formed by bonding electrodes to both surfaces of an electrolyte membrane. A fuel cell having one or a plurality of cell functional parts configured by sandwiching a body between a first separator and a second separator, wherein each of the separators is configured as described below. is there.

That is, the first separator comprises a metal press plate having a plurality of concave and convex grooves and a synthetic resin frame sandwiching the press plate from both sides. A fuel gas flow path through which fuel gas flows is formed on the surface side, and the second separator is a metal press plate having a plurality of uneven grooves and a synthetic resin frame that sandwiches the press plate from both sides. And an oxidizing gas flow path through which an oxidizing gas flows on the other surface side of the joined body, and both separators form a cooling water flow path through which cooling water flows on the joining side of each other. It is characterized by doing.

The first separator according to the present invention and the second separator
Can be configured as a united separator that is united with each other, and the united separator is configured as follows.

That is, the united separator is composed of two metal press plates having a plurality of concave and convex grooves, and a synthetic resin made of synthetic resin which is located on both sides of each plate and sandwiches both press plates. It is composed of three frames, is arranged alternately with the joined body, forms a cooling water flow path between the two press plates, and has a fuel gas passage on one surface side of one joined body. And an oxidizing gas flow path formed on the other surface side of the other joined body.

In these fuel cells according to the present invention, any or all of the fuel gas flow path, the oxidizing gas flow path, and the cooling water flow path formed by the concave and convex grooves of the press plate are folded back. Forming the shape, the folded shape of the flow path, formed by changing the length of a part of each of the concave and convex grooves constituting the flow path, or,
It can be formed by displacing a part of each of the concave and convex grooves forming the flow path in the longitudinal direction. In this case, the fuel gas flow path and the oxidizing gas flow path may be configured such that the cross-sectional area decreases every time the fuel gas flow path and the oxidizing gas flow path are turned back.

Further, in the fuel cell according to the present invention,
The fuel gas flow path formed by the concave and convex grooves of the press plate, the oxidizing gas flow path, and the cross-sectional area of any or all of the cooling water flow paths can be changed. According to the present invention, the cross-sectional area can be changed by changing the uneven height of each groove of the uneven shape of the press plate.

[0016]

The fuel cell according to the present invention comprises a metal press plate having a plurality of concave and convex grooves as a first separator and a second separator which are main components thereof. A separator made of a synthetic resin frame sandwiched from both sides is employed. The separator is formed of a metal plate and a synthetic resin frame, and is lightweight and inexpensive in terms of material. Also, the press plate and the frame need only be laminated or polymerized with an adhesive interposed therebetween, and the separator does not require any means for welding the joint between the metal press plates, resulting in extremely high productivity. In addition, the airtight joining between the metal press plate and the synthetic resin frame is accurately performed, and the unevenness of the press plate is formed by the fuel gas flow path, the oxidizing gas flow path, and the cooling water flow path. Leakage of gas and cooling water to the outside can be reliably prevented.

Therefore, the fuel cell according to the present invention using these separators as constituent members is lightweight, compact, and inexpensive.
In addition, there is no possibility of leakage of the fuel gas, the oxidizing gas, and the cooling water.

In the fuel cell according to the present invention, the first separator and the second separator can be employed as a united separator in which the first and second separators are united with each other. The united separator is composed of two metal press plates and three synthetic resin frames which are located on both sides of each plate and sandwich the press plates together. Arranged alternately, forming a cooling water flow path between the two press plates, and forming a fuel gas flow path on one surface side of one of the joined bodies, and on the other surface side of the other joined body. An oxidizing gas flow path is formed.

In this configuration, one frame of the first separator and the other frame of the second separator are shared, and by combining the two separators, both the separators can be integrally formed in a small size. The fuel cell becomes lighter and cheaper, and as a result, the fuel cell can be made lighter, smaller, and cheaper.

In these fuel cells according to the present invention, any or all of the fuel gas flow path, the oxidizing gas flow path, and the cooling water flow path formed by the concave and convex grooves of the press plate are folded. If you make it to
The battery performance can be enhanced by increasing the contact efficiency of the fuel gas and the oxidant gas with the joined body, and the battery performance can be enhanced by increasing the contact efficiency of the cooling water with the portion to be cooled and the cooling efficiency. In this case, by changing the length of a part of each of the concave and convex grooves forming each flow path, or by shifting a part of each of the concave and convex grooves forming the flow path in the longitudinal direction with respect to each other. The channel can be easily formed in a folded shape.

Further, in the fuel cell according to the present invention,
By appropriately changing the cross-sectional areas of the fuel gas passage, the oxidizing gas passage, and the cooling water passage, the set amount of the flow of the fuel gas, the oxidizing gas, and the cooling water can be appropriately adjusted in the battery function unit. By creating a state in which the flow state is uniform and a state in which the flow state is biased to a desired portion, the battery performance can be further improved.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an example of a fuel cell according to the present invention. The fuel cell has a plurality of battery functional units A arranged in parallel, and conductive current collector plates 11a and 11b in which all the battery functional units A arranged in parallel are arranged on both left and right sides. And it is assembled by being clamped by a plurality of mounting bolts 13 while being held between the insulating support plates 12a and 12b.

FIG. 2 is an exploded perspective view showing an embodiment of a cell function part constituting the fuel cell. The cell function part A is composed of a separator 20A and a joined body 30, and the joined body 30 is divided into two parts. One unit is sandwiched between the separators 20A. Therefore, in the fuel cell,
The separator 20A and the assembly 30 are alternately arranged to constitute a fuel cell. The separator 20A is a united separator in which the first separator and the second separator in the present invention are integrated.

The joined body 30 is formed by joining electrodes 32 to both sides of a solid electrolyte membrane 31. As the solid electrolyte membrane 31, an ion-permeable membrane made of a fluororesin is employed. Alternatively, it is formed by applying a carbon powder carrying a platinum alloy and joining electrodes 32 made of carbon cloth or the like.

As shown in FIGS. 2 and 3, the separator 20A includes two first and second press plates 21A and 22A having different shapes and three first, second, and second press plates having different shapes.
The third frame 23, 24, 25 is configured. Each press plate 21A, 22A is made of stainless steel,
It is made of metal such as iron, copper, and aluminum.
Each of the frames 23, 24 and 25 is made of a thermosetting resin such as an epoxy resin or a phenol resin, or a synthetic resin such as a thermoplastic resin such as polypropylene or polyethylene.

Each of the press plates 21A, 22A is a rectangular plate and has flow holes 21a, 21b, 22a, 22 forming fuel gas inflow manifolds 14a and outflow manifolds 14b at upper right and lower left sides in the drawing.
b, the flow holes 21c, 21d, 22c, 22d constituting the oxidant gas inflow manifold 15a and the outflow manifold 15b in the upper left and lower right portions, and the coolant inflow manifold 16a in the middle portion between the left and right sides. And flow holes 21e, 21f constituting the outflow manifold 16b,
22e, 22f, and a large number of concave and convex grooves 21g, 21h, 22g, 2 extending in the left-right direction at the center.
2h. The grooves 21g, 21h, 22g, 22h of the press plates 21A, 22A are alternately formed in an uneven shape on the front and back of the plate surface by press working. In the first press plate 21A, of the many grooves 21g and 21h, two grooves 21g1,
21h1 is formed to be longer than the other grooves 21g and 21h by a predetermined length to the left in the figure, and the two grooves 21g2 and 21h2 are formed.
Are formed longer by a predetermined length to the right in the figure than the other grooves 21g and 21h. The same applies to the second press plate 22A.

Each of the frames 23, 24 and 25 is a rectangular plate having the same size as each of the press plates 21A and 22A, and has a fuel gas inflow manifold 14a and a fuel gas inflow manifold 14b at the upper right and lower left sides. Flow holes 23a, 23b, 24a, 24b, 25a,
25b is provided in the upper left and lower right portions with flow holes 23c, 23d, 24c, 24d, 25 constituting the inflow manifold 15a and the outflow manifold 15b of the oxidizing gas.
c, 25d are provided in the middle portions of the left and right side portions with flow holes 23e, 23f, 24e, 24f, 25e, 25 constituting cooling water inflow manifold 16a and outflow manifold 16b.
f and a rectangular opening 23 in the center.
g, 24 g, and 25 g.

Openings 23 of each frame 23, 24, 25
g, 24g, and 25g, the upper and lower widths in the figure correspond to the grooves 21g, 21h, and 22 of the press plates 21 and 22, respectively.
g, 22h are formed to have substantially the same width as the width of the formation portion, and the left and right widths in the drawing are substantially the same as the width of the gap between the tip of each groove 21g1, 21h1 and the tip of each groove 21g2, 21h2. Is formed.

The first among the frames 23, 24, 25
In the frame 23, a fuel gas inflow path 23h having a predetermined width extending horizontally from the flow hole 23a forming the fuel gas inflow manifold 14a to the opening 23g, and a flow hole 23b forming the fuel gas outflow manifold 14b.
A fuel gas outflow passage 23i having a predetermined width extending in the horizontal direction from the opening 23g is formed. In the second frame 24, an inflow passage 24h of the oxidizing gas having a predetermined width extending in a horizontal direction from the flow hole 24c constituting the oxidizing gas inflow manifold 15a to the opening 24g, and an outflow manifold 15b of the oxidizing gas are formed. An oxidant gas outflow passage 24i of a predetermined width extending in the horizontal direction from the flowing flow hole 24d to the opening 24g is formed. In the third frame 25, a cooling water inflow passage 25h having a predetermined width extending downward from the flow hole 25e constituting the cooling water inflow manifold 16a to the opening 25g, and a cooling water outflow manifold 1
A cooling water outflow passage 25i having a predetermined width extending upward from the flow hole 25f forming the opening 6b to the opening 25g is formed.

In the separator 20A, as shown in FIG. 3, the first frame 23, the first pre-press plate 2
1A, third frame 25, second press plate 22A,
The second frame 24 is formed by being superimposed on each other and joined by interposing an adhesive between these members. As shown in FIG. 2, the battery function part A is configured by polymerizing each separator 20A on each surface side of the joined body 30 and joining them with an adhesive interposed between these members. FIG. 4 is a front view of the battery functional unit A thus configured, and FIGS. 5 to 10 are cross-sectional views of the battery functional unit A.

FIG. 11 shows that the fuel gas flow path (a in FIG. 11) formed by the first frame 23 and the first press plate 21A in the battery function section A is the first press plate 2
1A and the third frame 25 form a cooling water flow path (b in the drawing), and the second press plate 22A and the second frame 24
And an oxidizing gas flow path (FIG. 3c) formed by each of them.

In the battery function section A, each separator 2
0A is located across the joint 30 and each press plate 2
1A and 22A are in contact with the front and back surfaces of the joined body 30, and both press plates 21A and 22A are in contact with each other. In this state, a number of fuel gas channels through which fuel gas flows are formed by the grooves 21g between the joined body 30 and the first press plate 21A, and each fuel gas passage is formed between the joined body 30 and the second press plate 22A. By the groove 22h,
A large number of oxidizing gas channels through which the oxidizing gas flows are formed, and the first oxidizing gas passage is provided between the two press plates 21A and 22A.
A number of cooling water channels through which cooling water flows are formed by the grooves 21h of the press plate 21A and the grooves 22g of the second press plate 22A.

As shown in FIG. 11A, the fuel gas flow passage formed between the first press plate 21A and the joined body 30 has a fuel gas inflow passage 23h and an outflow passage formed by the first frame 23. 23i, but 2
The portion is blocked by long grooves 21h1 and 21h2, and is formed into a flow path that is folded twice between the fuel gas inflow path 23h and the fuel gas inflow path 23i.

As shown in FIG. 11C, the oxidizing gas flow path formed between the second press plate 22A and the joined body 30 is provided with an oxidizing gas inflow path 24h formed by the second frame 24. Although it is in communication with the outflow passage 24i, two portions in the middle thereof are blocked by the long grooves 22g1 and 22g2, and the two passages between the inflow passage 24h and the outflow passage 24i for the oxidizing gas.
It is formed in a turn-back channel.

First and second press plates 21A, 22A
As shown in FIG. 11B, the cooling water passage formed between the cooling water inflow passages 2 formed by the third frame 25.
5h and the outflow channel 25i, but two portions in the middle thereof are blocked by long grooves 21g1 and 21g2.
The cooling water is formed in a flow path that is folded twice between the inflow path 25h and the outflow path 25i.

As shown in FIG. 1, a plurality of battery functional units A are superposed in parallel on the left and right sides, and conductive current collector plates 11a and 11b and an insulating support plate are disposed on both left and right sides. The fuel cell is assembled by being clamped by a plurality of mounting bolts 13 while being sandwiched by 12a and 12b. During operation of the fuel cell, hydrogen is supplied to the fuel gas inflow manifold 14a, air is supplied to the oxidant gas inflow manifold 15a, and cooling water is supplied to the cooling water manifold 16a. You.

In each of the battery functional parts A, the hydrogen supplied to the fuel gas inflow manifold 14a flows through the fuel gas flow passage formed on the joined body 30 side in each groove 21g of the first press plate 21A. And flows into the fuel gas outflow manifold 14b, and the fuel gas outflow manifold 14b.
b. Oxidant gas inflow manifold 1
The air supplied to 5a flows through the oxidizing gas flow path formed on the joint body 30 side at each groove 22h of the second press plate 22A, flows into the oxidizing gas outflow manifold 15b, and is oxidized gas. Out through the outflow manifold 15b. The cooling water supplied to the cooling water inflow manifold 16a flows through the cooling water flow path formed between the press plates 21A and 22A by the respective grooves 21h and 22g, and flows into the cooling water outflow manifold 16b. Flows out through the cooling water outflow manifold 16b. During this time, in each of the battery functional units, electric power is generated by an oxidation-reduction reaction between hydrogen and air across the joined body 30, and the generated electric power is transmitted to the press plates 21A and 22A and the outermost current collector plates 11a and 11b. Is derived through

As described above, the fuel cell functions in the same manner as a conventional fuel cell of this type, but the separator 20A, which is a main component of each cell functional part A, is provided with a pressed metal press plate. 21A and 22A and frames 23 to 25 made of synthetic resin. For this reason, the material for forming the separator 20 is a metal plate and a synthetic resin frame, and is lightweight and inexpensive in terms of material. In addition, the press plates 21A, 22A and the frames 23 to 25 need only be laminated or polymerized with an adhesive interposed therebetween, and the separator 20A does not require welding of the joint between the metal press plates 21A, 22A. However, productivity is extremely high. Also, metal press plates 21A and 22A and each frame 2 made of synthetic resin are used.
The airtight joining between 3 to 25 is accurate, and the concave and convex grooves 21g, 21h, 2
Gas leakage to the outside from the fuel gas flow path, oxidizing gas flow path, and cooling water flow path formed by 2g and 22h and leakage of cooling water can be reliably prevented. Therefore, the fuel cell using each of these separators 20A as a constituent member is lightweight,
It is small, inexpensive, and free from leakage of fuel gas, oxidizing gas, and cooling water.

By the way, each cell function unit A of the fuel cell
And a first separator forming a fuel gas flow path on one side of the joined body 30;
0, a combined separator 20A integrally formed with a second separator forming an oxidant gas flow path is adopted to form a cooling water flow path between the first press plate 21A and the second press plate 22A. ing. For this reason, each battery function part A can be configured more compactly as compared with the related art.

In each of the battery function sections A, the fuel gas flow path, the oxidizing gas flow path, and the cooling water flow path are formed in a plurality of turns so as to improve gas diffusion performance and discharge reaction water. Many factors that improve battery performance, such as improved performance and improved cooling performance, can be created. Further, since the number of grooves constituting each groove is formed so as to be reduced every turn, it is possible to reduce a pressure loss on the upstream side of each gas, secure a high-speed flow on the downstream side, and the like.

In each of the battery function units A, the first,
Uneven grooves 21 of second press plates 21A, 22A
g, 21h, 22g, and 22h, by appropriately setting the number and arrangement of the elongated grooves, the number of times the fuel gas flow path, the oxidizing gas flow path, and the cooling water flow path are repeatedly turned to the desired number. By setting, the battery performance can be further improved. Also, the first and second press plates 21
A and 22A may be formed in the same shape.
The productivity of the battery function unit can be improved. Also,
First press plate 21A, second press plate 22A
By appropriately changing the depths of the groove portions 21g and 21h and the groove portions 22g and 22h, it is possible to obtain a compact structure with a low pressure loss according to the flow ratio of the fuel gas and the oxidizing gas.

FIGS. 12 to 19 show other embodiments of the battery function unit. In the battery function part B, the concave and convex grooves 21g, 21h, 22g, 22h of the first and second press plates 21B, 22B are formed so as to be alternately shifted left and right. The number of turns of the passage, the oxidizing gas passage, and the cooling water passage is set to the maximum. 12 to 19 in the battery function unit B correspond to FIGS.
The same reference numerals as those shown in FIGS. 4 to 11 denote the same components and the same components, and a detailed description thereof will be omitted. Then
The fuel cell having the battery function part B as a constituent member also has the same operation and effect as the above-described fuel cell.

In the battery function part B, the concave and convex grooves formed on each of the press plates 21B and 22B correspond to the shapes of the concave and convex grooves formed on each of the press plates 21A and 22A of the battery function part A. Is changed to change the cross-sectional areas of the fuel gas flow path, the oxidizing gas flow path, and the cooling water flow path, and the number of turns of these flow paths. FIG. 10 shows an example of another battery function part C in which the cross-sectional areas of the passage, the oxidizing gas passage, and the cooling water passage, and the number of times of folding of these passages are further changed.

FIG. 20 shows the battery function section C shown in FIGS.
5 is a longitudinal sectional view corresponding to FIG.
The cross-sectional areas of the fuel gas channel and the oxidizing gas channel are similar,
Although the number of turns is the same, the cross-sectional area of the cooling water channel is completely different by setting the number of turns to zero. In the reference numerals shown in the figure, 20C is a separator, 21C is a first press panel, and 22C is a second press plate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a fuel cell according to an example of the present invention.

FIG. 2 is an exploded perspective view of one embodiment of a cell function part constituting the fuel cell.

FIG. 3 is an exploded perspective view of a separator constituting the battery function unit.

FIG. 4 is a front view of the battery function unit as viewed from a first frame side.

FIG. 5 is an enlarged end view of the battery function unit taken along line 5-5 in FIG. 4;

FIG. 6 is an enlarged end view of the battery function unit taken along line 6-6 in FIG.

FIG. 7 is an enlarged sectional view of the battery function unit taken along line 7-7 in FIG.

FIG. 8 is an enlarged end view of the battery function unit taken along line 8-8 in FIG. 4;

FIG. 9 is an enlarged end view of the battery function unit taken along line 9-9 in FIG. 4;

FIG. 10 is an enlarged end view of the battery function unit taken along line 10-10 in FIG. 4;

FIG. 11 (a) is a front view showing a fuel gas flow path on the front side of a first press plate of the battery function unit viewed from a first frame side, and FIG. 11 is a first view showing a cooling water flow path on a back side of the first press plate. It is the front view (b) seen from the press plate side, and the front view (c) seen from the second press plate side showing the oxidant gas flow path on the back side of the second press plate.

FIG. 12 is a front view of a battery function portion of another embodiment of the fuel cell as viewed from a first frame side.

FIG. 13 is an enlarged end view of the battery function unit taken along line 13-13 in FIG.

FIG. 14 is an enlarged end view of the battery function unit taken along line 14-14 in FIG.

FIG. 15 is an enlarged end view of the battery function unit taken along line 15-15 in FIG.

FIG. 16 is an enlarged end view of the battery function unit taken along line 16-16 in FIG. 12;

FIG. 17 is an enlarged end view of the battery function unit taken along line 17-17 in FIG. 12;

FIG. 18 is an enlarged end view of the battery function unit taken along line 18-18 in FIG.

FIG. 19A is a front view showing the fuel gas flow path on the front side of the first press plate of the battery function unit viewed from the first frame side, and FIG. 19B is a first view showing the cooling water flow path on the back side of the first press plate. It is the front view (b) seen from the press plate side, and the front view (c) seen from the second press plate side showing the oxidant gas flow path on the back side of the second press plate.

FIG. 20 is a longitudinal sectional view corresponding to FIGS. 7 and 15 and showing a cell function part of still another embodiment constituting the fuel cell.

[Explanation of symbols]

A, B, C: battery functional part, 11a, 11b: current collector, 1
2a, 12b support plate, 13 mounting bolts, 14a fuel gas inflow manifold, 14b fuel gas outflow manifold, 15a oxidant gas inflow manifold,
15b: oxidant gas outflow manifold, 16a: cooling water inflow manifold, 16b: cooling water outflow manifold, 20A, 20B, 20C: separator, 21A,
22A, 21B, 22B, 21C, 22C ... press plate, 21a, 21b, 22a, 22b ... fuel gas flow holes, 21c, 21d, 22c, 22d ... oxidant gas flow holes, 21e, 21f, 22e, 22f ... Cooling water flow holes, 21 g, 21 h, 22 g, 22 h.
24, 25 ... frame, 23a, 23b, 24a, 24
b, 25a, 25b: fuel gas flow holes, 23c, 23
d, 24c, 24d, 25c, 25d: oxidant gas flow holes, 23e, 23f, 24e, 24f, 25e, 25
f: cooling water flow holes, 23g, 24g, 25g: openings, 23h: fuel gas inflow, 23i ... fuel gas outflow, 24h ... oxidant gas inflow, 24i ... fuel gas outflow, 25h: cooling water inflow path, 25i: cooling water outflow path, 30: joined body, 31: solid electrolyte membrane, 32: electrode.

Claims (9)

[Claims] 1. A fuel cell having one or a plurality of cell functional parts constituted by sandwiching a joined body formed by joining electrodes on both surfaces of an electrolyte membrane between a first separator and a second separator, The first separator is composed of a metal press plate having a plurality of uneven grooves and a synthetic resin frame that sandwiches the press plate from both sides.
A fuel gas flow path through which fuel gas flows is formed on one surface side of the joined body, and the second separator sandwiches a metal press plate having a plurality of concave and convex grooves and the press plate from both sides. An oxidizing gas flow path through which an oxidizing gas flows is formed on the other surface side of the joined body, and cooling water flows through the separators on both sides thereof. A fuel cell, wherein a cooling water flow path is formed. 2. The fuel cell according to claim 1, wherein the first separator and the second separator are united separators which are united with each other, and are arranged alternately with the unit. Fuel cell. 3. The fuel cell according to claim 2, wherein the united separator comprises two metal press plates having a plurality of concave and convex grooves, and both press plates located on both sides of each of the plates. It is composed of three frames made of synthetic resin sandwiching a press plate with each other, is arranged alternately with the joined body, forms a cooling water flow path between the two press plates, and forms one joined body. A fuel cell, wherein a fuel gas flow path is formed on one surface side and an oxidizing gas flow path is formed on the other surface side of the other joined body. 4. The fuel cell according to claim 1, 2 or 3, wherein at least one of a fuel gas flow path, an oxidizing gas flow path, and a cooling water flow path formed by the concave and convex grooves of the press plate. Wherein the flow path is formed in a folded shape. 5. The fuel cell according to claim 4, wherein the folded shape of the flow path is formed by changing the length of a part of each of the concave and convex grooves forming the flow path. A fuel cell, characterized by: 6. The fuel cell according to claim 4, wherein the folded shape of the flow path is formed by displacing a part of each of the concave and convex grooves constituting the flow path in the longitudinal direction. A fuel cell, characterized in that: 7. The fuel cell according to claim 4, wherein the fuel gas flow path and the oxidizing gas flow path have a reduced cross-sectional area at each turn. 8. The fuel cell according to claim 1, wherein at least one of a fuel gas flow path, an oxidizing gas flow path, and a cooling water flow path formed by the concave and convex grooves of the press plate. Wherein the cross-sectional area of the flow path is varied. 9. The fuel cell according to claim 8, wherein the change in the cross-sectional area of the flow path is formed by changing the height of the unevenness of each groove of the unevenness of the press plate. Fuel cell.