JP2021057282A - Power generation cell and method for manufacturing power generation cell - Google Patents

Abstract

To reduce the cost for forming a reaction gas flow path while maintaining power generation characteristics.SOLUTION: A power generation cell 12 of a fuel cell 16 includes an electrolyte membrane/electrode structure 30 in which electrodes 36 each having a conductive and porous gas diffusion layer 42 are arranged on both sides of an electrolyte membrane 34, metal separators 32 that sandwich the electrolyte membrane/electrode structure 30 therebetween, and a conductive flow path forming body 44 that is interposed between the gas diffusion layer 42 and the separators 32 to form a reaction gas flow path 58. At least portions of the separators 32 facing the flow path forming body 44 are flat. A first surface 48a of the flow path forming body 44 and a second surface 54 of the gas diffusion layer 42 which face each other are joined to each other by an adhesive layer 55 which is arranged in an island shape with respect to the first surface 48a and the second surface 54.SELECTED DRAWING: Figure 4

Description

The present invention relates to a power generation cell including a flow path forming body that is interposed between a gas diffusion layer of an electrolyte membrane / electrode structure and a separator to form a reaction gas flow path, and a method for manufacturing the same.

For example, Patent Document 1 discloses a fuel cell in which an electrolyte membrane / electrode structure (MEA) in which electrodes are arranged on both sides of the electrolyte membrane is sandwiched between metal separators. In this fuel cell, the separator is provided with a reaction gas flow path through which the reaction gas supplied to the electrolyte membrane / electrode structure flows. When the reaction gas flow path is provided in the separator, the separator is press-molded using a mold having a cavity corresponding to the shape of the reaction gas flow path.

Japanese Patent No. 4948823

When the separator is press-molded as described above, it is necessary to prepare a mold having a complicated shape according to the shape of the reaction gas flow path, but the mold having a complicated shape is expensive and has a short life. Therefore, there is a concern that the cost for forming the reaction gas flow path will increase.

Therefore, an object of the present invention is to provide a power generation cell and a method for manufacturing the same, which can reduce the cost for forming a reaction gas flow path while maintaining the power generation characteristics.

One aspect of the present invention is a metal product that sandwiches an electrolyte membrane / electrode structure in which electrodes having a conductive and porous gas diffusion layer are arranged on both sides of the electrolyte membrane, and the electrolyte membrane / electrode structure. A separator and a conductive flow path forming body that forms a reaction gas flow path between the gas diffusion layer and the separator are provided, and at least a portion of the separator facing the flow path forming body is flat. In a fuel cell power generation cell, the first surface of the flow path forming body facing each other and the second surface of the gas diffusion layer are arranged in an island shape with respect to the first surface and the second surface. It is joined by a bonded adhesive layer.

Another aspect of the present invention is a metal sandwiching an electrolyte membrane / electrode structure in which electrodes having a conductive and porous gas diffusion layer are arranged on both sides of the electrolyte membrane and the electrolyte membrane / electrode structure. The separator is provided with a conductive flow path forming body that forms a reaction gas flow path between the gas diffusion layer and the separator, and at least a portion of the separator facing the flow path forming body is provided. A method for manufacturing a flat fuel cell power generation cell, wherein the first surface of the flow path forming body or the conductive member which is the material of the flow path forming body, and the material of the gas diffusion layer or the gas diffusion layer. An adhesive arranging step of arranging an adhesive layer in an island shape on at least one of the second surface of the conductive porous body, and the first surface and the second surface are laminated to form the adhesive layer. Has a joining step of curing the.

In the power generation cell of this fuel cell, since the reaction gas flow path is formed by the flow path forming body interposed between the separator and the gas diffusion layer, at least the portion of the separator facing the flow path forming body can be flattened. it can. As a result, it is possible to avoid preparing a mold having a complicated shape for press-molding the reaction gas flow path in the separator, and by extension, it is possible to reduce the cost of forming the reaction gas flow path.

In the power generation cell, the first surface of the flow path forming bodies facing each other and the second surface of the gas diffusion layer are joined by an adhesive layer arranged in an island shape. By arranging the adhesive layers in an island shape in this way, for example, the adhesive required to form the adhesive layer is more than the case where the adhesive layers are arranged on the entire first surface and the second surface. The amount of can be reduced. As a result, the flow path forming body can be provided at low cost, and thus the reaction gas flow path can be formed at low cost.

Further, by arranging the adhesive layers in an island shape, non-intervening portions where the adhesive layer does not intervene are generated on the first surface and the second surface facing each other. Since the first surface and the second surface can be brought into direct contact with each other in the non-intervening portion, good conductivity between the flow path forming body and the gas diffusion layer is maintained, and the internal resistance of the power generation cell is reduced. Can be done. Further, in the non-intervening portion, it is possible to prevent the pores of the porous gas diffusion layer from being blocked by the adhesive layer, so that good diffusibility of the reaction gas through the pores can be maintained. From these, it is possible to maintain good power generation characteristics of the power generation cell.

From the above, according to the present invention, it is possible to reduce the cost for forming the reaction gas flow path while maintaining the power generation characteristics of the power generation cell.

It is a schematic overall perspective view of the fuel cell provided with the power generation cell obtained by applying the method of manufacturing the power generation cell which concerns on embodiment of this invention. It is an exploded perspective explanatory view of the power generation cell of the fuel cell of FIG. It is sectional drawing along the line III-III of FIG. It is explanatory drawing of the surface of the electrolyte membrane / electrode structure of FIG. 2 on the arrow A2 side. It is explanatory drawing explaining the island-shaped adhesive layer arranged on the 1st surface of a conductive member. FIG. 6A is a schematic explanatory view illustrating a first cut portion and a second cut portion of the conductive member, and FIG. 6B is a first cut for cutting the first cut portion in the VIB-VIB line direction of FIG. 6A. FIG. 6C is a schematic explanatory view of a main part for explaining a cutting device equipped with a blade, and FIG. 6C shows a cutting device equipped with a second cutting blade that cuts a second cutting portion in the VIC-VIC line direction of FIG. 6A. It is explanatory drawing of the main part for explanation. FIG. 7A is a schematic explanatory view of the divided portion connecting body and the conductive porous body before joining, and FIG. 7B is a schematic explanatory view of the intermediate. FIG. 8A is a schematic explanatory view illustrating the first cutting line and the second cutting line of the intermediate, and FIG. 8B is a view showing the VIIIB-VIIIB line direction of FIG. 8A for cutting the intermediate at the first cutting line. 3 is a schematic explanatory view of a main part for explaining a cutting device equipped with a cutting blade, and FIG. 8C is equipped with a fourth cutting blade that cuts an intermediate at a second cutting line in the VIIIC-VIIIC line direction of FIG. 8A. FIG. 8D is a schematic explanatory view of a main part for explaining a cutting device, and FIG. 8D is a schematic explanatory view of a flow path structure.

A preferred embodiment of the power generation cell and the method for manufacturing the power generation cell according to the present invention will be described in detail with reference to the accompanying drawings. In the following figures, components having the same or similar functions and effects may be designated by the same reference numerals, and repeated description may be omitted.

The power generation cell 12 (FIGS. 1 to 3) according to the present embodiment has the flow path structure 10 shown in FIGS. 2 to 4. Further, as shown in FIG. 1, the power generation cell 12 is provided in the fuel cell 16 (fuel cell stack) in a state of a plurality of laminated bodies 14 stacked in the direction of arrow A. That is, in the present embodiment, the fuel cell 16 is in the form of a fuel cell stack. However, the fuel cell 16 is not particularly limited to this, and the fuel cell 16 may be composed of, for example, one power generation cell 12. Further, the fuel cell 16 can be used, for example, by being mounted on a fuel cell electric vehicle (not shown), or as a stationary type.

As shown in FIG. 1, a terminal plate, an insulator 18a, and an end plate 20a (not shown) are sequentially arranged outward on one end side (arrow A1 side) of the laminated body 14 in the stacking direction. A terminal plate, an insulator 18b, and an end plate 20b (not shown) are sequentially arranged outward at the other end of the laminated body 14 in the stacking direction (arrow A2 side).

The end plates 20a and 20b have, for example, a horizontally long (or vertically long) rectangular shape in the horizontal direction (direction of arrow B), and a connecting bar 22 is arranged between each side. Both ends of each connecting bar 22 are fixed to the inner surfaces of the end plates 20a and 20b via bolts 23, and a tightening load in the stacking direction (arrow A direction) is applied to the plurality of stacked power generation cells 12. The fuel cell 16 may be provided with a housing (not shown) having end plates 20a and 20b as end plates, and the laminated body 14 may be housed in the housing.

The end plates 20a, 20b and each power generation cell 12 communicate with each other in the stacking direction (arrow A direction) at one end edge in the longitudinal direction (arrow B1 side end), and the oxidant gas inlet communication hole 24a. , The cooling medium inlet communication hole 26a and the fuel gas outlet communication hole 28b are provided so as to be arranged in the direction of arrow C. An oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 24a. At least one of pure water, ethylene glycol, oil, and the like is supplied to the cooling medium inlet communication hole 26a as a cooling medium. Fuel gas such as hydrogen-containing gas is discharged from the fuel gas outlet communication hole 28b.

The end plates 20a and 20b and the other end edge portion (arrow B2 side end portion) in the longitudinal direction of each power generation cell 12 communicate with each other in the stacking direction, and the fuel gas inlet communication hole 28a, the cooling medium outlet communication hole 26b, and the cooling medium outlet communication hole 26b. Oxidizing agent gas outlet communication holes 24b are provided so as to be arranged in the direction of arrow C. Fuel gas is supplied to the fuel gas inlet communication hole 28a. The cooling medium is discharged from the cooling medium outlet communication hole 26b. Oxidizing agent gas is discharged from the oxidizing agent gas outlet communication hole 24b.

In the following, the oxidizer gas inlet communication hole 24a, the oxidizer gas outlet communication hole 24b, the fuel gas inlet communication hole 28a, the fuel gas outlet communication hole 28b, the cooling medium inlet communication hole 26a, and the cooling medium outlet communication hole 26b are collectively referred to. It is also simply called a "communication hole". The arrangement and shape of each of these communication holes is not limited to this embodiment, and may be appropriately set according to the required specifications.

As shown in FIGS. 2 and 3, the power generation cell 12 is made of metal and is arranged on one surface side (arrow A1 side) of the electrolyte membrane / electrode structure 30 and the electrolyte membrane / electrode structure 30. It includes one separator 32a and a second metal separator 32b arranged on the other surface side (arrow A2 side) of the electrolyte membrane / electrode structure 30. When the first separator 32a and the second separator 32b are not particularly distinguished, they are also collectively referred to as "separator 32".

As shown in FIG. 3, the electrolyte membrane / electrode structure 30 includes an electrolyte membrane 34, a cathode electrode 36a and an anode electrode 36b that sandwich the electrolyte membrane 34. As shown in FIG. 2, a film-shaped resin frame member 38 is provided on the outer peripheral portion of the electrolyte membrane / electrode structure 30 over the entire circumference.

As shown in FIG. 3, the electrolyte membrane 34 can be formed from, for example, a fluorine-based electrolyte such as a thin film of perfluorosulfonic acid containing water, or can be formed from an HC (hydrocarbon) -based electrolyte. The cathode electrode 36a has a cathode electrode catalyst layer 40a bonded to the surface of the electrolyte film 34 on the arrow A1 side, and a cathode gas diffusion layer 42a laminated on the arrow A1 side of the cathode electrode catalyst layer 40a. The anode electrode 36b has an anode electrode catalyst layer 40b bonded to the surface of the electrolyte film 34 on the arrow A2 side, and an anode gas diffusion layer 42b laminated on the arrow A2 side of the anode electrode catalyst layer 40b.

The cathode electrode catalyst layer 40a is formed, for example, by uniformly coating the surface of the cathode gas diffusion layer 42a with porous carbon particles on which a platinum alloy is supported. The anode electrode catalyst layer 40b is formed, for example, by uniformly coating the surface of the anode gas diffusion layer 42b with porous carbon particles on which a platinum alloy is supported. The cathode gas diffusion layer 42a and the anode gas diffusion layer 42b are each formed of a plate-shaped conductive porous body 46 (FIG. 7A) having a larger external dimension than the cathode gas diffusion layer 42a and the anode gas diffusion layer 42b as raw materials. To. The material of the conductive porous body 46 is, for example, carbon paper, carbon cloth, or the like.

As shown in FIGS. 2 and 4, the resin frame member 38 has a frame shape, and for example, the inner peripheral edge portion thereof is the outer peripheral edge portion of the cathode gas diffusion layer 42a (FIG. 2) and the anode gas diffusion layer. It is sandwiched between the outer peripheral edge of 42b (FIG. 4). The inner peripheral end surface of the resin frame member 38 may be close to, abutted against, or overlapped with the outer peripheral end surface of the electrolyte membrane 34. The communication holes are provided in the resin frame member 38 of each power generation cell 12.

As shown in FIGS. 2 and 3, an oxidant gas flow path forming body 44a is interposed between the cathode gas diffusion layer 42a and the first separator 32a. The oxidant gas flow path structure 10a is configured as a junction between the oxidant gas flow path forming body 44a and the cathode gas diffusion layer 42a. A fuel gas flow path forming body 44b is interposed between the anode gas diffusion layer 42b and the second separator 32b. The fuel gas flow path structure 10b is configured as a junction between the fuel gas flow path forming body 44b and the anode gas diffusion layer 42b.

Hereinafter, when the cathode electrode 36a and the anode electrode 36b are not particularly distinguished, they are also collectively referred to as “electrode 36”. Similarly, the cathode electrode catalyst layer 40a and the anode electrode catalyst layer 40b are collectively referred to as "electrode catalyst layer 40", and the cathode gas diffusion layer 42a and the anode gas diffusion layer 42b are also collectively referred to as "gas diffusion layer 42". , The oxidant gas flow path forming body 44a and the fuel gas flow path forming body 44b are also collectively referred to as "flow path forming body 44", and the oxidizing agent gas flow path structure 10a and the fuel gas flow path structure 10b are collectively referred to as "flow path forming body 44". Also referred to as "channel structure 10".

In the present embodiment, as will be described later, the flow path forming body 44 is, for example, a plate-shaped conductive member 48 made of the same material as the gas diffusion layer 42, that is, the same material as the conductive porous body 46 of FIG. 7A. It is formed using FIG. 5 as a raw material, and has a main body portion 50 and a flow path groove 52. The external dimensions of the flow path forming body 44 in the stacking direction (direction of arrow A) are formed to be substantially the same as the external dimensions of the gas diffusion layer 42.

As shown in FIG. 3, the first surface 48a of the main body 50 of the flow path forming body 44 is a surface of the gas diffusion layer 42 opposite to the surface provided with the electrode catalyst layer 40 (arrows in the cathode gas diffusion layer 42a). The surface on the A1 side, the surface on the arrow A2 side in the anode gas diffusion layer 42b) is joined to the second surface 54 by the adhesive layer 55 of FIG. In this embodiment, the adhesive layer 55 is formed from a non-conductive adhesive. Therefore, the first surface 48a and the second surface 54 are joined by the non-conductive adhesive layer 55 without using a conductive adhesive. As the type of the adhesive layer 55, various non-conductive ones can be used. The adhesive layer 55 may be formed of a conductive adhesive instead of being formed of a non-conductive adhesive.

As shown in FIG. 4, the adhesive layer 55 has an island shape that is intermittent without being connected to the first surface 48a and the second surface 54 (in the present embodiment, a plurality of dots having a part of a circle cut out). It is arranged in the shape). Therefore, a non-intervening portion 55a in which the adhesive layer 55 does not intervene is formed between the first surface 48a and the second surface 54 facing each other. In the non-intervening portion 55a, the first surface 48a and the second surface 54 come into direct contact with each other without the adhesive layer 55.

The number of island-shaped adhesive layers 55, the shape in the direction of arrow A, the arrangement, and the like are not particularly limited. The adhesive layer 55 is arranged so that the non-intervening portion 55a is formed with respect to the first surface 48a and the second surface 54, in other words, without covering the entire first surface 48a and the second surface 54. Just do it. Examples of the outer shape of each of the island-shaped adhesive layer 55 include a circular shape, an oval shape (oval, oval, oval, etc.), a polygonal shape (triangle, square, pentagon, hexagon, etc.), and one of these shapes. Examples thereof include a shape in which a portion is cut out. Further, the adhesive layer 55 may be arranged in a grid pattern in the direction of arrow A, or may be arranged so as to extend in a wavy shape.

Further, when a plurality of island-shaped adhesive layers 55 are provided, the plurality of adhesive layers 55 may be arranged regularly with respect to the first surface 48a and the second surface 54, or may be irregularly arranged. It may be scattered and arranged in. For example, the area of the adhesive layer 55 with respect to the surface area of the main body 50 is preferably set to about 5 to 30%. The area of the non-conductive adhesive layer 55 with respect to the area of the first surface 48a or the second surface 54 is such that the flow path forming body 44 and the gas diffusion layer 42 can be adhered to each other, and the non-intervening portion 55a is used. It is preferable that the setting is made so as to secure sufficient conductivity between the flow path forming body 44 and the gas diffusion layer 42.

As shown in FIG. 2, the main body 50 penetrates the main body 50 in the thickness direction (arrow A direction), and one end (arrow) of the main body 50 is formed along the second surface 54 of the gas diffusion layer 42. A plurality of flow path grooves 52 extending from the B1 side end portion) to the other end (arrow B2 side end portion) are provided. Therefore, the main body portion 50 has a plurality of divided portions 56 formed by dividing the main body portion 50 in the direction of arrow C by the flow path groove 52. That is, the dividing portions 56 are arranged on both sides of the flow path groove 52 in the width direction (arrow C direction). In other words, a flow path groove 52 is formed between the divided portions 56 facing each other at intervals in the direction of arrow C.

In the present embodiment, as shown in FIGS. 2 and 4, the flow path groove 52 extends in a wavy shape having a plurality of periods in the direction of arrow B with the direction of arrow C as the amplitude direction. For example, it may extend in a straight line or a zigzag shape in the direction of arrow B. The plurality of flow path grooves 52 may be arranged at equal intervals with each other in the direction of arrow C, or may be arranged at different intervals from each other. The width dimension of each flow path groove 52 may be formed substantially constant over the entire extension direction of the flow path groove 52, or may change in the extension direction of the flow path groove 52. .. As shown in FIG. 3, the cross-sectional shape of the flow path groove 52 is formed to be quadrangular, but it may be a shape other than quadrangular.

A water-repellent treatment portion (not shown) may be provided on the inner surface of the groove forming the flow path groove 52 of the main body portion 50. The water-repellent treatment portion is formed, for example, by applying an alcohol solution containing a fluororesin to the inner surface of the groove forming the flow path groove 52, or by including the water-repellent material in the material of the flow path forming body 44. It can be formed.

As shown in FIG. 2, the flow path groove 52 of the oxidant gas flow path forming body 44a communicates with the oxidant gas inlet communication hole 24a via one end (arrow B1 side end) in the extending direction thereof. , Communicates with the oxidant gas outlet communication hole 24b via the other end (the end on the arrow B2 side) in the extending direction. As a result, inside the flow path groove 52 of the oxidant gas flow path forming body 44a, the oxidant gas is from the arrow B1 side to the arrow B2 side along the cathode electrode 36a (the second surface 54 of the cathode gas diffusion layer 42a). The oxidant gas flow path 58a through which the oxidizer gas flows is formed.

As shown in FIG. 4, the flow path groove 52 of the fuel gas flow path forming body 44b communicates with the fuel gas inlet communication hole 28a via the other end (end on the arrow B2 side) in the extending direction, and also communicates with the fuel gas inlet communication hole 28a. It communicates with the fuel gas outlet communication hole 28b via one end in the extending direction (the end on the arrow B1 side). As a result, the fuel gas flows from the arrow B2 side to the arrow B1 side along the anode electrode 36b (second surface 54 of the anode gas diffusion layer 42b) inside the flow path groove 52 of the fuel gas flow path forming body 44b. The fuel gas flow path 58b is formed.

In the following, when the oxidant gas and the fuel gas are not particularly distinguished, they are also collectively referred to as “reaction gas”, and similarly, the oxidant gas flow path 58a and the fuel gas flow path 58b are collectively referred to. Also referred to as "reaction gas flow path 58".

As shown in FIG. 2, of the surfaces of the separator 32 facing the electrolyte membrane / electrode structure 30 (hereinafter, also referred to as inner side surfaces 60), the portion of the separator 32 facing the flow path forming body 44 is a flat flat surface 62. .. That is, in the first separator 32a, the flat surface 62 is provided on the inner surface 60 which is the surface on the arrow A2 side, and in the second separator 32b, the flat surface 62 is provided on the inner surface 60 which is the surface on the arrow A1 side. .. It is preferable that the separator 32 does not have a press-molded portion and is flat over the entire inner side surface 60 and the outer side surface 68 which is the back surface thereof.

On the inner side surface 60 of the separator 32, a buffer portion 64 is provided between the communication hole and the flat surface 62, respectively. Although the illustration of the buffer portion 64 relating to the inner surface 60 of the first separator 32a is omitted, the buffer portion 64 is also provided on the inner surface 60 of the first separator 32a in the same manner as the inner surface 60 of the second separator 32b. Has been done.

The buffer portion 64 has, for example, a plurality of embossed 64a protruding toward the electrolyte membrane / electrode structure 30 side (inside in the stacking direction). For example, the plurality of embossed 64a may be formed by performing simple press molding on the separator 32, or the flat inner side surface 60 of the separator 32 may be formed by using a dispenser (not shown) or the like. It may be formed by providing a protrusion made of a resin (adhesive or the like), rubber, or a polymer material such as an elastomer. Further, the buffer portion 64 may be formed by attaching a sheet (not shown) provided with the protrusions to the inner side surface 60 of the separator 32 or the like.

In the first separator 32a, the buffer portion 64 guides the oxidant gas from the oxidant gas inlet communication hole 24a to the oxidant gas flow path 58a, and from the oxidant gas flow path 58a to the oxidant gas outlet communication hole 24b. And the oxidizer gas is derived. Further, in the second separator 32b, the buffer portion 64 disperses and guides the fuel gas from the fuel gas inlet communication hole 28a to the fuel gas flow path 58b, and also guides the fuel gas from the fuel gas flow path 58b to the fuel gas outlet communication hole 28b. And the fuel gas is dispersed and guided.

Further, the inner side surface 60 of the separator 32 is provided with, for example, a sealing portion 66 made of elastic rubber or the like so as to bulge toward the electrolyte membrane / electrode structure 30. The seal portion 66 includes an inner seal portion 66a that integrally surrounds the flat surface 62 and the buffer portion 64, an outer seal portion 66b extending along the outer circumference of the separator 32 outside the inner seal portion 66a, and a plurality of communication holes. It has a communication hole sealing portion 66c that individually surrounds the seal portion 66c.

The communication hole seal portion 66c and the inner seal portion 66a have a continuous portion 66d integrated so that the surrounding regions communicate with each other. As a result, on the inner surface 60 of the second separator 32b, each of the fuel gas inlet communication hole 28a and the fuel gas outlet communication hole 28b can communicate with the fuel gas flow path 58b. Although the illustration of the seal portion 66 relating to the inner surface 60 of the first separator 32a is omitted, the continuous portion 66d communicates each of the oxidant gas inlet communication hole 24a and the oxidant gas outlet communication hole 24b with the oxidant gas flow path 58a. A seal portion 66 is also provided on the inner side surface 60 of the first separator 32a, similarly to the inner side surface 60 of the second separator 32b, except that the first separator 32a is provided as possible.

The inner surface 60 of at least one of the first separator 32a and the second separator 32b may be provided with a conductive, corrosion-resistant film (not shown). Such a corrosion resistant film can be formed from, for example, gold or TiO ₂ (titanium oxide).

As described above, in the fuel cell 16, since a plurality of power generation cells 12 are laminated to form the laminated body 14 (FIG. 1), as shown in FIG. 3, the outer surface of the inner surface 60 of the first separator 32a is the back surface. The outer surface 68 of the second separator 32b of the other power generation cell 12 faces the side surface 68. Further, the outer surface 68 of the first separator 32a of the other power generation cell 12 faces the outer surface 68 of the second separator 32b.

As shown in FIG. 2, between the outer surface 68 of the first separator 32a and the outer surface 68 of the second separator 32b, a cooling medium flow communicating with the cooling medium inlet communication hole 26a and the cooling medium outlet communication hole 26b. Road 70 is formed. The communication hole seal portion 66c and the inner seal portion 66a provided on the outer surface 68 of the separator 32 are continuous so that each of the cooling medium inlet communication hole 26a and the cooling medium outlet communication hole 26b can communicate with the cooling medium flow path 70. It has a portion 66d. A cooling medium flows through the cooling medium flow path 70 along the surface direction of the outer surface 68 of the separator 32. Although not shown, between the outer surface 68 of the first separator 32a and the outer surface 68 of the second separator 32b, for example, a plate member having a mesh structure or a protrusion protruding from at least one of the outer surfaces 68. A portion or the like is provided, whereby the height of the cooling medium flow path 70 in the arrow A direction, the flow direction of the cooling medium, the flow speed, and the like are adjusted.

Hereinafter, with reference to FIGS. 5, 6A to 6C, 7A, 7B, and 8A to 8D, the flow path structure 10 of FIGS. The case of obtaining the power generation cell 12 to be provided will be described as an example.

First, as shown in FIG. 5, an adhesive arranging step of arranging the adhesive layer 55 in an island shape on the first surface 48a of the plate-shaped conductive member 48 which is the material of the flow path forming body 44 of FIG. 8D is performed. Do. The first surface 48a is a surface to which the conductive porous body 46 (FIG. 7A), which is the material of the gas diffusion layer 42 of FIG. 8D, is bonded in the bonding step described later. The conductive porous body 46 of FIG. 7A is formed in a rectangular shape from carbon paper, carbon cloth, or the like whose external dimensions are one size larger than those of the gas diffusion layer 42 having the final shape shown in FIG. 8D.

As described above, in the present embodiment, the material of the conductive member 48 (flow path forming body 44) of FIG. 5 and the material of the gas diffusion layer 42 (conductive porous body 46 of FIG. 7A) of FIG. 8D are the same. Is. Therefore, the conductive member 48 is formed by using the same carbon paper or carbon cloth as the gas diffusion layer 42. Further, the outer shape of the conductive member 48 in FIG. 5 has a rectangular shape larger than that in the gas diffusion layer 42 in FIG. 8D.

The adhesive layer 55 can be arranged in an island shape on the first surface 48a by, for example, inkjet printing or screen printing. In the adhesive arranging step, the adhesive layer 55 may be arranged in an island shape on the second surface 54 of the conductive porous body 46 of FIG. 7A instead of the conductive member 48 of FIG. The adhesive layer 55 may be arranged in an island shape on both the first surface 48a of the sex member 48 and the second surface 54 of the conductive porous body 46.

Next, as shown in FIG. 6A, with respect to the conductive member 48, the flow path groove 52 and the dividing portion 56 shown in FIG. 7A, and a plurality of dividing portions 56 on both ends in the extending direction of the flow path groove 52. A flow path groove forming step is performed in which the connecting portion 72 and the connecting portion 72 are formed to obtain the divided portion connecting body 74. In the flow path groove forming step, for example, the first cutting portion 76 and the second cutting portion 78 shown by the alternate long and short dash line in FIG. 6A of the conductive member 48 are cut by using the cutting device 80 of FIGS. 6B and 6C. As a result, the split portion connecting body 74 shown in FIG. 7A is formed.

As shown in FIG. 6A, in the thickness direction (arrows D1 and D2 directions) of the conductive member 48, both ends in the long side direction (arrows E1 and E2 directions) are in the short side direction (arrows F1 and F2 directions). ) Is provided with a non-excised portion 82 extending. The uncut portion 82 corresponds to the connecting portion 72 of the dividing portion connecting body 74 of FIG. 7A.

The first cut portion 76 is a central portion in the long side direction excluding the non-cut portion 82 of the conductive member 48, and has a rectangular shape provided at both ends in the short side direction. That is, the conductive member 48 is provided with a total of two first cutting points 76. The second cutting portion 78 has the shape, number, and arrangement of the plurality of flow path grooves 52 of FIGS. 2 to 4 and 7A with respect to the central portion in the long side direction except for the non-cutting portion 82 of the conductive member 48. A plurality of them are provided correspondingly. That is, the second cutting portion 78 of FIG. 6A corresponds to the flow path groove 52 of the dividing portion connecting body 74 of FIG. 7A.

The cutting device 80 of FIGS. 6B and 6C has, for example, the first cutting blade 84 (blade) of FIG. 6B capable of punching or cutting out the first cutting portion 76 of FIG. 6A of the conductive member 48, and the first cutting blade 84 (blade) of FIG. 6A. 2 A support portion 88 to which both or one of the second cutting blade 86 (blade) of FIG. 6C capable of punching or cutting out the cut portion 78 can be mounted, and the conductive member 48 set on the base 90. It is provided with a drive unit (not shown) that drives the support unit 88 in a direction (vertical direction, arrows D1 and D2 directions) that approaches or separates from the support unit 88.

Therefore, the conductive member 48 is set on the base 90, and the support portion 88 is driven by the driving unit to remove the first cut portion 76 and the second cut portion 78 from the conductive member 48. The split portion connecting body 74 shown in 7A can be obtained. At this time, in the present embodiment, as shown in FIGS. 6B and 6C, the first cutting blade 84 and the second cutting blade 86 are applied to the conductive member 48 from the first surface 48a side to the dividing portion of FIG. 6A. A connector 74 is obtained.

The first excision site 76 and the second excision site 78 may be excised at the same time or separately. Further, using a predetermined number of second cutting blades 86 that is smaller than the number of one second cutting blade 86 or the number of second cutting points 78, a plurality of second cutting points 78 are formed one by one or by a predetermined number. It may be cut in order, or a plurality of second cut points 78 may be cut at the same time by using the same number of second cutting blades 86 as the second cut points 78. Similarly, the two first excision points 76 may be excised one by one in order, or two may be excised at the same time.

After performing the flow path groove forming step as described above, as shown in FIGS. 7A and 7B, a joining step of laminating the first surface 48a and the second surface 54 to cure the adhesive layer 55 is performed. Do. In the present embodiment, as shown in FIG. 7B, the length of the conductive porous body 46 in the short side direction (arrows F1 and F2 directions) is the short side direction of the dividing portion connecting body 74 (arrows F1 and F2 directions). It is set to be the same as the length of the connecting portion 72 in. Further, the length of the conductive porous body 46 in the long side direction (arrows E1 and E2 directions) is set longer than the length of the entire divided portion connecting body 74 in the long side direction (arrows E1 and E2 directions). ..

When the first surface 48a and the second surface 54 are laminated, the lengths of the connecting portion 72 and the conductive porous body 46 in the short side direction are made the same as described above, so that the connecting portion in the short side direction is the same. By aligning the positions of both ends of the 72 and the conductive porous body 46, the divided portion connecting body 74 and the conductive porous body 46 can be easily positioned.

Further, in the divided portion connecting body 74, the rigidity in the short side direction (arrows F1 and F2 directions) of the main body portion 50 is reduced by the amount that the plurality of flow path grooves 52 are provided. Even in this case, since the connecting portion 72 protrudes outward from both ends of the main body portion 50 in the short side direction, the connecting portion having higher rigidity in the short side direction than the main body portion 50 instead of the main body portion 50. 72 can be used to position the split portion connecting body 74 with respect to the conductive porous body 46. That is, since the four corners of the divided portion connecting body 74 can be used, the positioning of the divided portion connecting body 74 in the short side direction can be performed with high accuracy.

Next, the divided portion connecting body 74 and the conductive porous body 46 in which the first surface 48a and the second surface 54 are laminated are pressurized and heated in the stacking direction by using, for example, a heating press (not shown). The adhesive is cured by (hot pressing). As a result, at least the divided portion 56 of the divided portion connecting body 74 and the conductive porous body 46 are joined to obtain the intermediate 92. The method of curing the adhesive is not limited to the above hot press.

After performing the joining step as described above, as shown in FIGS. 8A to 8D, a trimming step of removing the connecting portion 72 (FIG. 8A) of the intermediate 92 to obtain the flow path structure 10 (FIG. 8D). I do. In the trimming step, for example, the intermediate body 92 is cut along the first cutting line 94 and the second cutting line 96 shown by the alternate long and short dash line in FIG. 8A in the stacking direction (arrows D1 and D2 directions) of the intermediate body 92. The flow path structure 10 shown in FIG. 8D is formed.

As shown in FIG. 8A, the first cutting line 94 is in the short side direction (arrows F1 and F2 directions) of the main body 50 of the dividing portion connecting body 74 when viewed in the stacking direction (arrows D1 and D2 directions) of the intermediate body 92. Both ends extend along the long side direction (arrows E1 and E2 directions). The first cutting line 94 may be arranged on both ends of the main body 50 in the short side direction (arrows F1 and F2 directions), or may be arranged between both ends and the flow path groove 52 adjacent to both ends. May be done.

As shown in FIG. 8B, the support portion 88 is moved in the vertical direction by the cutting device 80 equipped with the third cutting blade 98 (blade) capable of cutting along the first cutting line 94 of FIG. 8A. .. The third cutting blade 98 is brought into contact with the first cutting line 94 from the conductive porous body 46 side (arrow D1 side) in the stacking direction of the intermediate 92 to cut the intermediate 92. As a result, the lengths of both ends of the conductive porous body 46 and the divided portion connecting body 74 in the short side direction are made uniform.

As shown in FIG. 8A, the second cutting line 96 is the connecting portion 72 in the long side direction (arrows E1 and E2 directions) of the dividing portion connecting body 74 in the stacking direction (arrows D1 and D2 directions) of the intermediate body 92. The center side (main body 50 side) extends along the short side direction (arrows F1 and F2 directions). The second cutting line 96 may be arranged on both ends of the flow path groove 52 in the extending direction, or may be arranged on the center side of the flow path groove 52 in the extending direction rather than both ends in the extending direction. Good.

As shown in FIG. 8C, the support portion 88 is moved in the vertical direction by the cutting device 80 equipped with the fourth cutting blade 100 (blade) capable of cutting along the second cutting line 96 of FIG. 8A. .. The fourth cutting blade 100 is brought into contact with the second cutting line 96 from the conductive porous body 46 side (arrow D1 side) in the stacking direction of the intermediate 92 to cut the intermediate 92. As a result, the lengths of both ends of the conductive porous body 46 and the divided portion connecting body 74 in the long side direction are made uniform, and the plurality of divided portions 56 are in a divided state. That is, both ends of the flow path groove 52 on the arrows E1 and E2 sides are openings.

As a result, the joint body of the flow path forming body 44 obtained by removing the connecting portion 72 of the dividing portion connecting body 74 and the gas diffusion layer 42 obtained by removing the outer peripheral edge portion of the conductive porous body 46. A flow path structure 10 of FIG. 8D is obtained.

The intermediate 92 may be cut along the first cutting line 94 and then the intermediate 92 may be cut along the second cutting line 96, or the intermediate 92 may be cut along the second cutting line 96. Later, the intermediate 92 may be cut along the first cutting line 94. In these cases, both the cutting of the intermediate body 92 along the first cutting line 94 and the cutting of the intermediate body 92 along the second cutting line 96 can be performed by, for example, either the third cutting blade 98 or the fourth cutting blade 100. Each may be performed using one cutting blade such as one of them. At this time, cutting may be performed while rotating the direction of the intermediate body 92 with respect to one cutting blade by 90 °, or cutting may be performed while rotating the direction of the cutting blade with respect to the intermediate body 92 by 90 °.

The cutting of the intermediate 92 along the first cutting line 94 and the cutting of the intermediate 92 along the second cutting line 96 may be performed substantially at the same time. In this case, one cutting blade (not shown) in which the third cutting blade 98 and the fourth cutting blade 100 are integrated is brought into contact with the first cutting line 94 and the second cutting line 96 substantially simultaneously, and the intermediate 92 May be disconnected.

Further, for example, the length of the conductive porous body 46 of FIG. 7A in the short side direction (arrows F1 and F2 directions) and the portion (main body portion 50) of the divided portion connecting body 74 of FIG. 7A excluding the connecting portion 72. The length is set to be the same as the length in the short side direction (arrows F1 and F2 directions), and the flow path structure 10 is obtained by cutting along the second cutting line 96 without cutting along the first cutting line 94. You may.

After forming the flow path structure 10 as described above, as shown in FIGS. 2 and 3, an electrolyte membrane / electrode structure 30 having the flow path structure 10 is obtained, and the electrolyte membrane / electrode structure 30 is formed. The power generation cell 12 can be obtained by further performing the assembly step of sandwiching the separator 32. In the assembly step, for example, the cathode electrode catalyst layer 40a is provided on the back surface of the second surface 54 to which the oxidant gas flow path forming body 44a is joined of the cathode gas diffusion layer 42a constituting the oxidant gas flow path structure 10a. Similarly, the anode electrode catalyst layer 40b is provided on the back surface of the second surface 54 to which the fuel gas flow path forming body 44b is joined of the anode gas diffusion layer 42b constituting the fuel gas flow path structure 10b.

Next, the oxidizing agent gas flow path structure 10a, the cathode electrode catalyst layer 40a, the electrolyte film 34, and the anode electrode catalyst so that the electrolyte film 34 is sandwiched between the cathode electrode catalyst layer 40a and the anode electrode catalyst layer 40b. The layer 40b and the fuel gas flow path structure 10b are laminated. As a result, the electrolyte membrane / electrode structure 30 in which the flow path forming bodies 44 are bonded to both ends in the stacking direction can be obtained. The power generation cell 12 is formed by sandwiching the flow path forming body 44 and the electrolyte membrane / electrode structure 30 with the separator 32 so that the inner side surface 60 of the separator 32 faces the flow path forming body 44 of the electrolyte membrane / electrode structure 30. Is obtained. In the power generation cell 12, the reaction gas flow path 58 is formed by the flow path forming body 44 interposed between the separator 32 and the gas diffusion layer 42.

As shown in FIG. 1, a plurality of power generation cells 12 are formed and laminated in the stacking direction to obtain a laminated body 14, and the terminal plate, the insulator 18a, and the like as described above are outside the laminated body 14 in the stacking direction. The fuel cell 16 can be obtained by providing the 18b and the end plates 20a and 20b.

The operation of the fuel cell 16 configured as described above will be briefly described. When power is generated by the fuel cell 16, fuel gas is supplied to the fuel gas inlet communication hole 28a shown in FIGS. 1 and 2, oxidant gas is supplied to the oxidant gas inlet communication hole 24a, and the cooling medium inlet communication hole 26a is used. Is supplied with a cooling medium.

The oxidant gas supplied to the oxidant gas inlet communication hole 24a is oxidized with one end (the end on the arrow B1 side) in the extending direction of each flow path groove 52 of the oxidant gas flow path forming body 44a as an inlet. It is introduced into the agent gas flow path 58a. Then, the oxidant gas is supplied to the cathode electrode 36a of the electrolyte membrane / electrode structure 30 while moving in the oxidant gas flow path 58a toward the arrow B2 side.

The fuel gas supplied to the fuel gas inlet communication hole 28a has a fuel gas flow with the other end (the end on the arrow B2 side) in the extending direction of each flow path groove 52 of the fuel gas flow path forming body 44b as an inlet. Introduced on road 58b. Then, the fuel gas is supplied to the anode electrode 36b of the electrolyte membrane / electrode structure 30 while moving in the fuel gas flow path 58b toward the arrow B1 side.

In each electrolyte membrane / electrode structure 30 of the laminate 14, the oxidant gas supplied to the cathode electrode 36a and the fuel gas supplied to the anode electrode 36b are consumed by the electrochemical reaction in the electrode catalyst layer 40. , Power is generated.

The remaining oxidant gas that was not consumed in the electrochemical reaction is oxidized by using the other end (the end on the arrow B2 side) of each flow path groove 52 of the oxidant gas flow path forming body 44a in the extending direction as an outlet. It is discharged to the agent gas outlet communication hole 24b, and is discharged to the outside of the fuel cell 16 through the oxidant gas outlet communication hole 24b. The remaining fuel gas that has not been consumed in the electrochemical reaction is communicated with the fuel gas outlet by using one end (the end on the arrow B1 side) of each flow path groove 52 of the fuel gas flow path forming body 44b in the extending direction as an outlet. It is discharged into the hole 28b and discharged to the outside of the fuel cell 16 through the fuel gas outlet communication hole 28b.

On the other hand, the cooling medium supplied to the cooling medium inlet communication hole 26a exchanges heat with the power generation cell 12 by flowing through the cooling medium flow path 70. As a result, the power generation cell 12 is maintained at a predetermined operating temperature or the like. The cooling medium after heat exchange is discharged to the outside of the fuel cell 16 through the cooling medium outlet communication hole 26b.

In the power generation cell 12 of the fuel cell 16, the reaction gas flow path 58 is formed by the flow path forming body 44 interposed between the separator 32 and the gas diffusion layer 42, so that at least the flow path forming body 44 of the separator 32 The facing part can be flattened. As a result, it is possible to avoid preparing a mold having a complicated shape for press-molding the reaction gas flow path 58 in the separator 32, and thus it is possible to reduce the cost of forming the reaction gas flow path 58.

In the power generation cell 12, the first surface 48a of the flow path forming body 44 facing each other and the second surface 54 of the gas diffusion layer 42 are joined by an adhesive layer 55 arranged in an island shape. By arranging the adhesive layers 55 in an island shape in this way, for example, the adhesive layer 55 is formed as compared with the case where the adhesive layer 55 is arranged on the entire first surface 48a and the second surface 54. The amount of adhesive required for this can be reduced. As a result, the flow path forming body 44 can be provided at low cost, and thus the reaction gas flow path 58 can be formed at low cost.

Further, by arranging the adhesive layer 55 in an island shape, a non-intervening portion 55a in which the adhesive layer 55 does not intervene is formed on the first surface 48a and the second surface 54 facing each other. In the non-intervening portion 55a, since the first surface 48a and the second surface 54 can be brought into direct contact with each other, the conductivity between the flow path forming body 44 and the gas diffusion layer 42 is maintained, and the internal resistance of the power generation cell 12 is maintained. Can be reduced. Further, in the non-intervening portion 55a, it is possible to prevent the pores of the gas diffusion layer 42 from being blocked by the adhesive layer 55. Therefore, in the flow path structure 10, good diffusibility of the reaction gas through the pores can be maintained. From these, it is possible to maintain good power generation characteristics of the power generation cell 12.

Therefore, in the power generation cell 12, the cost for forming the reaction gas flow path 58 can be reduced while maintaining the power generation characteristics.

In the power generation cell 12 according to the above embodiment, the adhesive layer 55 is arranged in a plurality of dots with respect to the first surface 48a and the second surface 54. Further, in the method for manufacturing a power generation cell according to the above embodiment, in the adhesive arranging step, the adhesive layer 55 is arranged in a plurality of dots on at least one of the first surface 48a and the second surface 54. ..

In this case, the adhesive layer 55 can be dispersed and arranged on the entire first surface 48a and the second surface 54. Therefore, it is possible to satisfactorily bond the first surface 48a and the second surface 54 while reducing the amount of the adhesive layer 55 used. Further, the non-intervening portion 55a can be dispersed and arranged with respect to the entire first surface 48a and the second surface 54. Therefore, the conductivity between the flow path forming body 44 and the gas diffusion layer 42 can be maintained well, and the good diffusibility of the reaction gas through the pores of the gas diffusion layer 42 can be maintained. Can be done. From these, it is possible to further reduce the cost for forming the reaction gas flow path 58 while maintaining the power generation characteristics of the power generation cell 12 even better.

In the power generation cell 12 according to the above embodiment, the adhesive layer 55 is formed of a non-conductive adhesive. Further, in the adhesive arranging step of the method for manufacturing a power generation cell according to the above embodiment, the adhesive layer 55 made of a non-conductive adhesive is arranged. The non-conductive adhesive can be prepared at a lower cost than the conductive adhesive. Therefore, by forming the adhesive layer 55 using a non-conductive adhesive, for example, the flow path forming body 44 can be provided at a lower cost than when a conductive adhesive is used. As a result, the reaction gas flow path 58 can be formed at low cost. The adhesive layer 55 may be formed of a conductive adhesive. In this case, the conductivity between the flow path forming body 44 and the gas diffusion layer 42 is maintained well to generate electricity in the power generation cell 12. It becomes possible to maintain the characteristics even better.

In the power generation cell 12 according to the above embodiment, the reaction gas flow path 58 is determined to extend in a wavy shape along the second surface 54 of the gas diffusion layer 42. Further, in the flow path groove forming step of the power generation cell manufacturing method according to the above embodiment, the flow path groove 52 extending in a wavy shape along the surface direction of the first surface 48a is formed on the conductive member 48. did. By forming the reaction gas flow path 58 in a wavy shape as described above, it is possible to efficiently supply the reaction gas to the electrolyte membrane / electrode structure 30 via the reaction gas flow path 58. Become.

In the power generation cell 12 according to the above embodiment, the flow path forming body 44 is made of the same material as the gas diffusion layer 42. In this case, since the flow path forming body 44 can be made porous, the reaction gas is applied to the electrolyte membrane / electrode structure 30 not only inside the flow path groove 52 but also through the pores of the main body 50. Can be supplied. As a result, the reaction gas can be supplied to the electrolyte membrane / electrode structure 30 through the entire flow path forming body 44 facing the gas diffusion layer 42 while promoting its diffusion. Therefore, it is possible to promote the electrochemical reaction in the electrolyte membrane / electrode structure 30 to enhance the power generation characteristics of the fuel cell 16.

Further, since the material for forming the flow path forming body 44 does not need to be prepared separately from the gas diffusion layer 42, the reaction gas flow path 58 can be formed more easily and at low cost. Further, by using the same material for the material forming the flow path forming body 44 and the gas diffusion layer 42, it is possible to reduce the contact resistance between each other and reduce the internal resistance of the fuel cell 16, and the power generation efficiency. Can be increased.

The flow path forming body 44 may be formed of a porous material different from the gas diffusion layer 42, and may have a mesh structure made of, for example, metal, carbon, a conductive resin, or the like. Further, the flow path forming body 44 is not limited to being porous, and may be, for example, a dense body such as a metal plate, a carbon plate, or a conductive resin plate.

In the adhesive arranging step of the method for manufacturing a power generation cell according to the above embodiment, the adhesive layer 55 is arranged in an island shape on the first surface 48a of the conductive member 48, and after the adhesive arranging step. Prior to the joining step, a flow path groove forming step of penetrating the conductive member 48 in the thickness direction and forming a flow path groove 52 whose inside is a reaction gas flow path 58 is performed. did.

However, the present invention is not particularly limited to this, and for example, in the method of manufacturing a power generation cell, the conductive member 48 is penetrated through the conductive member 48 in the thickness direction and the inside thereof is formed before the adhesive placement step. A flow path groove forming step of forming the flow path groove 52 to be the reaction gas flow path 58 is performed, and in the adhesive arranging step, an adhesive is applied to the first surface 48a of the conductive member 48 on which the flow path groove 52 is formed. The layer 55 may be arranged in the island shape.

In the adhesive arranging step and the joining step according to the above-described embodiment, the first surface 48a of the plate-shaped conductive member 48 which is the material of the flow path forming body 44 and the conductive porous material which is the material of the gas diffusion layer 42. It was decided to join the body 46 (FIG. 7A). However, in the adhesive arranging step, the adhesive layer 55 may be provided in an island shape on at least one of the first surface 48a of the flow path forming body 44 and the second surface 54 of the gas diffusion layer 42.

That is, after the main body portion 50 is formed from the conductive member 48, the adhesive layer 55 may be provided in an island shape on the first surface 48a of the main body portion 50 (divided portion 56). After forming the gas diffusion layer 42 by adjusting the external dimensions of the conductive porous body 46 or the like, the adhesive layer 55 may be provided on the second surface 54 of the gas diffusion layer 42 in an island shape. In this case, in the joining step, the first surface 48a of the flow path forming body 44 and the second surface 54 of the gas diffusion layer 42 are laminated and joined to each other.

In the adhesive arranging step, the adhesive layer 55 is provided in an island shape on at least one of the first surface 48a of the flow path forming body 44 and the second surface 54 of the conductive porous body 46, and the flow path is formed in the joining step. The forming body 44 and the conductive porous body 46 may be bonded. Further, in the adhesive arranging step, the adhesive layer 55 is provided in an island shape on at least one of the first surface 48a of the conductive member 48 and the second surface 54 of the gas diffusion layer 42, and in the joining step, the conductive member 48 And the gas diffusion layer 42 may be bonded.

In the method for manufacturing a power generation cell according to the above embodiment, the conductive member 48 is partially cut off between the adhesive arranging step and the joining step, and the flow path groove 52 and the plurality of divided portions 56 are formed. And a connecting portion 72 for connecting a plurality of dividing portions 56 on at least one end side in the extending direction of the flow path groove 52, and a flow path groove forming step for obtaining the divided portion connecting body 74 was performed. Further, in the joining step, it was decided to join at least the divided portion 56 of the divided portion connecting body 74 and the conductive porous body 46 to obtain the intermediate 92. Further, after the joining step, a trimming step of removing the connecting portion 72 of the intermediate 92 to obtain the flow path structure 10 is performed.

In this case, in the joining step, the connecting portion 72 maintains the relative positions of the plurality of divided portions 56, so that the plurality of divided portions 56 can be handled integrally. That is, the intermediate 92 can be easily and efficiently obtained from the divided portion connecting body 74 and the conductive porous body 46.

The flow path structure 10 is formed by removing the connecting portion 72 of the intermediate 92 in the trimming step. At this time, in the intermediate 92, since the plurality of divided portions 56 are joined to the conductive porous body 46, the relative positions of each of the plurality of divided portions 56 and the conductive porous body 46 are maintained. As it is, the connecting portion 72 can be removed to obtain the flow path structure 10. That is, the flow path structure 10 can be easily and efficiently obtained from the intermediate 92.

From these, for example, as compared with the case where a plurality of divided portions 56 are individually joined to the gas diffusion layer 42 while adjusting their respective arrangements to form the flow path structure 10, the flow path structure 10 is formed. The reaction gas flow path 58 can be easily and efficiently formed, and thus the reaction gas flow path 58 can be easily and efficiently formed.

However, in the method for manufacturing a power generation cell according to the present embodiment, the flow path groove forming step and the trimming step are not indispensable. For example, when both the flow path groove forming step and the trimming step are not performed, the main body portion 50 is directly formed from the conductive member 48 after the adhesive arranging step, and in the joining step, the main body portion 50 (divided portion 56) and the main body portion 50 are formed. It may be bonded to the gas diffusion layer 42.

In the flow path groove forming step according to the above embodiment, the blade (first cutting blade) is attached to the conductive member 48 from the first surface 48a side to be joined to the gas diffusion layer 42 or the conductive porous body 46 in the joining step. It was decided to apply the 84 and the second cutting blade 86) to obtain the dividing portion connecting body 74. In this case, since it is possible to suppress the formation of burrs or the like on the surface side of the finally obtained flow path forming body 44 facing the gas diffusion layer 42, the electrolyte membrane / electrode structure 30 is combined with the burrs of the flow path forming body 44. It is possible to suppress the influence of contact.

In the trimming step according to the above embodiment, the connecting portion 72 is cut by applying a blade (fourth cutting blade 100) from the gas diffusion layer 42 or the conductive porous body 46 side in the stacking direction of the intermediate 92. And said. In this case, it is possible to prevent burrs and the like from being generated on the surface side of the flow path forming body 44 facing the gas diffusion layer 42 and on the surface side of the gas diffusion layer 42 where the electrode catalyst layer 40 is provided. Therefore, it is possible to suppress the influence of the contact of the flow path forming body 44 with the burr on the electrolyte membrane / electrode structure 30 and the influence of the contact of the gas diffusion layer 42 with the burr on the electrode catalyst layer 40. ..

Of course, the fuel cell 16 according to the present invention is not limited to the above-described embodiment, and can adopt various configurations without departing from the gist of the present invention.

12 ... Power generation cell 16 ... Fuel cell 30 ... Electrolyte film / electrode structure 32 ... Separator 34 ... Electrolyte film 36 ... Electrode 42 ... Gas diffusion layer 44 ... Flow path forming body 46 ... Conductive porous body 48 ... Conductive member 48a ... 1st surface 52 ... Channel groove 54 ... 2nd surface 55 ... Adhesive layer 58 ... Reaction gas flow path

Claims (11)

An electrolyte membrane / electrode structure in which electrodes having a conductive and porous gas diffusion layer are arranged on both sides of the electrolyte membrane, a metal separator sandwiching the electrolyte membrane / electrode structure, and the gas diffusion layer. And a fuel cell power generation cell comprising a conductive flow path forming body that is interposed between the separators and forms a reaction gas flow path, and at least a portion of the separator facing the flow path forming body is flat. There,
The first surface of the flow path forming body facing each other and the second surface of the gas diffusion layer are joined by an adhesive layer arranged in an island shape with respect to the first surface and the second surface. , Power generation cell. In the power generation cell according to claim 1,
The adhesive layer is a power generation cell arranged in a plurality of dots with respect to the first surface and the second surface. In the power generation cell according to claim 1 or 2.
The adhesive layer is a power generation cell formed of a non-conductive adhesive. In the power generation cell according to any one of claims 1 to 3.
The reaction gas flow path is a power generation cell extending in a wavy shape along the second surface of the gas diffusion layer. The power generation cell according to any one of claims 1 to 4, wherein the flow path forming body is made of the same material as the gas diffusion layer. An electrolyte membrane / electrode structure in which electrodes having a conductive and porous gas diffusion layer are arranged on both sides of the electrolyte membrane, a metal separator sandwiching the electrolyte membrane / electrode structure, and the gas diffusion layer. And a fuel cell power generation cell comprising a conductive flow path forming body that is interposed between the separators and forms a reaction gas flow path, and at least a portion of the separator facing the flow path forming body is flat. It ’s a manufacturing method,
At least one of the first surface of the flow path forming body or the conductive member which is the material of the flow path forming body and the second surface of the gas diffusion layer or the conductive porous body which is the material of the gas diffusion layer. Adhesive placement process for arranging the adhesive layer in an island shape
A joining step of laminating the first surface and the second surface to cure the adhesive layer, and
A method of manufacturing a power generation cell having. In the method for manufacturing a power generation cell according to claim 6,
In the adhesive arranging step, a method for manufacturing a power generation cell, in which the adhesive layer is arranged in a plurality of dots on at least one of the first surface and the second surface. In the method for manufacturing a power generation cell according to claim 6 or 7.
In the adhesive arranging step, the adhesive layer is arranged in an island shape with respect to the first surface of the conductive member.
After the adhesive arranging step and before the joining step, the conductive member is formed through the conductive member in the thickness direction and a flow path groove whose inside is the reaction gas flow path is formed. A method for manufacturing a power generation cell, which performs a flow path groove forming step. In the method for manufacturing a power generation cell according to claim 6 or 7.
Prior to the adhesive arranging step, a flow path groove forming step of penetrating the conductive member in the thickness direction and forming a flow path groove whose inside becomes the reaction gas flow path is performed. ,
In the adhesive arranging step, a method for manufacturing a power generation cell, in which the adhesive layer is arranged in an island shape on the first surface of the conductive member on which the flow path groove is formed. In the method for manufacturing a power generation cell according to claim 8 or 9.
In the flow path groove forming step, a method for manufacturing a power generation cell, in which the flow path groove extending in a wavy shape along the surface direction of the first surface is formed on the conductive member. In the method for manufacturing a power generation cell according to any one of claims 6 to 10.
A method for manufacturing a power generation cell, in which the adhesive layer made of a non-conductive adhesive is arranged in the adhesive arranging step.

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