Power generation battery

Abstract

The present invention provides a power generation battery capable of efficiently restricting a bypass flow of a reaction gas flowing so as to avoid a power generation region and more reliably preventing leakage of the reaction gas. A power generation cell (C) according to the present invention is characterized by being provided with a wave-line-shaped reaction gas flow path (21) that causes a reaction gas to flow from one end side of a separator (2) toward the other end side thereof along an electrolyte membrane / electrode structure. And a sealing part (24) which surrounds the reaction gas flow path (21) in a state of being in contact with the resin frame part of the electrolyte membrane / electrode structure to prevent leakage of the reaction gas, the sealing part (24) having a plurality of apex parts (21a1) protruding toward the reaction gas flow path (21) side. A top portion (21a1) of the reaction gas flow path (21) protruding toward the seal portion (24) side is located on a straight line (L) connecting two adjacent top portions (24a1) of the seal portion (24) or protrudes toward the seal portion (24) side beyond the straight line (L).

Description

Technical Field

[0001] The present invention relates to a power generation cell. Background Art

[0002] In recent years, research on fuel cells that contribute to energy efficiency has been conducted to ensure that more people have access to affordable, reliable, sustainable, and advanced energy.

[0003] Conventionally, a bipolar plate for a fuel cell having a channel structure in which a plurality of reaction gas flow paths are arranged along an electrochemically active region of a polymer electrolyte membrane is known (for example, see Patent Document 1). The bipolar plate has a boundary wall (sealing portion) formed along the periphery and a limiting member composed of a rib, wherein the rib prevents the reaction gas from flowing (bypassing flow) between the boundary wall and the channel structure.

[0004] According to such a fuel cell, the bypass flow of the reactant gas that is trying to flow between the channel structure and the boundary wall to avoid the power generation area is blocked by the restriction member, thereby improving the reaction rate of the reactant gas in the power generation area of ​​the fuel cell.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 5239091 Summary of the invention

[0008] Problems to be solved by the invention

[0009] Generally, when a bipolar plate is manufactured by press-forming a plate body, a reaction gas flow path of the bipolar plate is formed as a groove portion (channel structure) on the plate surface.

[0010] Recent fuel cells have a tendency to have larger power generation areas and finer pitches in reaction gas flow paths. As a result, bipolar plates may bend due to excess material in the plate during press molding.

[0011] When such bipolar plates are used to form a conventional fuel cell stack (see, for example, Patent Document 1), the surface pressure of the bipolar plates in the power generation region relative to the polymer electrolyte membrane deviates, and the reaction gas easily leaks from the reaction gas flow path. In addition, the limiting component of the bipolar plate that intercepts the bypass flow is formed in a manner that connects the boundary wall to the outer periphery of the channel structure. Therefore, due to the step difference between the boundary wall and the channel structure caused by the deflection of the bipolar plate (separator), the reaction gas may also leak from the boundary wall (sealing portion).

[0012] An object of the present invention is to provide a power generation cell that can effectively restrict the bypass flow of the reaction gas that flows so as to avoid the power generation area and more reliably prevent the leakage of the reaction gas, and further contribute to improving energy efficiency.

[0013] Means for solving problems

[0014] The power generation cell of the present invention for achieving the above-mentioned problems includes an electrolyte membrane / electrode structure having electrodes on both sides of an electrolyte membrane, a resin frame portion provided on the outer periphery of the electrolyte membrane / electrode structure, and partitions arranged on both sides of the electrolyte membrane / electrode structure. The power generation cell is characterized in that the partition is a plate-like component made of metal and is provided with: a wavy reaction gas flow path that allows the reaction gas to flow from one end of the partition toward the other end along the electrolyte membrane / electrode structure; and a sealing portion that surrounds the reaction gas flow path in contact with the resin frame portion to prevent leakage of the reaction gas, the sealing portion having a plurality of tops bulging toward the reaction gas flow path side, and the top of the reaction gas flow path bulging toward the sealing portion side is located on a straight line connecting two adjacent tops of the sealing portion or protrudes toward the sealing portion side beyond the straight line.

[0015] In addition, the power generation cell of the present invention includes an electrolyte membrane / electrode structure having electrodes on both sides of an electrolyte membrane, a resin frame portion arranged on the outer periphery of the electrolyte membrane / electrode structure, and partitions arranged on both sides of the electrolyte membrane / electrode structure. The power generation cell is characterized in that the partition is a plate-like component made of metal and is provided with: a wavy reaction gas flow path that allows the reaction gas to flow from one end of the partition toward the other end along the electrolyte membrane / electrode structure; and a sealing portion that surrounds the reaction gas flow path in a state of contact with the resin frame portion to prevent leakage of the reaction gas, the sealing portion having a top portion bulging toward the reaction gas flow path side, and the top portion of the reaction gas flow path bulging toward the sealing portion side is formed at a position opposite to the top portion of the sealing portion bulging toward the reaction gas flow path side.

[0016] Effects of the Invention

[0017] According to the power generation cell of the present invention, the bypass flow of the reaction gas that flows so as to avoid the power generation area can be efficiently restricted, and leakage of the reaction gas can be prevented more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded perspective view of a power generation cell according to an embodiment of the present invention.

[0019] Figure 2 is with Figure 1The position of arrow II corresponds to a partially enlarged top view of the power generation cell.

[0020] Figure 3A yes Figure 2 IIIA-IIIA cross-sectional view.

[0021] Figure 3B yes Figure 2 IIIB-IIIB cross-sectional view.

[0022] Figure 4 yes Figure 3B A cross-sectional view of a modified example of the electrolyte membrane / electrode structure shown.

[0023] Figure 5 This is a plan view of the separator viewed from the electrolyte membrane / electrode structure side.

[0024] Fig. 6A yes Figure 5 A partial enlarged view of the VIA portion.

[0025] Figure 6B yes Figure 5 A partial enlarged view of the VIB part.

[0026] Figure 6C This is a partially enlarged plan view of the separator showing a state in which a concave portion of a sealing portion in the separator faces a convex portion of a reaction gas flow path.

[0027] Figure 7 It is a partially enlarged top view of a power generation cell according to another embodiment.

[0028] Description of Reference Numerals

[0029] 1 Electrolyte membrane / electrode structure

[0030] 2 Cathode side separator

[0031] 3 Anode side separator

[0032] 10a Reaction gas supply port

[0033] 10e Reaction gas supply port

[0034] 12a cathode

[0035] 12b Anode

[0036] 13 Resin frame

[0037] 21 Reaction gas flow path

[0038] 21a Convex portion of reaction gas flow path

[0039] 21a1 Top of the convex portion of the reaction gas flow path

[0040] 21b Recessed portion of reaction gas flow path

[0041] 221st reaction gas flow path

[0042] 23 Second reaction gas flow path

[0043] 24 Sealing part

[0044] 24a Two adjacent convex portions of the sealing portion

[0045] 24a1 The top of two adjacent convex parts of the sealing part

[0046] 24b Recessed part of sealing part

[0047] 25 bypass flow path

[0048] 31 Reaction gas flow path

[0049] 321st reaction gas flow path

[0050] 33 Second reaction gas flow path

[0051] 34 Sealing part

[0052] 35 bypass flow path

[0053] A1 Power Generation Area

[0054] A2 Non-power generation area

[0055] C Power generation battery

[0056] L Straight Line DETAILED DESCRIPTION

[0057] Next, the mode (embodiment) for implementing the power generation cell of the present invention will be described in detail with reference to the appropriate drawings.

[0058] The main feature of the power generation cell of this embodiment is that it is arranged on a partition in such a manner that a plurality of wavy reaction gas flow paths snaking in one direction are arranged on the surface of an electrolyte membrane / electrode assembly (MEA), and the convex portion of the wavy reaction gas flow path is arranged close to a sealing portion of the reaction gas provided along the periphery of the partition, thereby forming a restriction portion for the bypass flow of the reaction gas.

[0059] Hereinafter, after explaining the overall structure of the power generation cell, the electrolyte membrane / electrode structure and the separator will be explained.

[0060] 《Overall structure of power generation battery》

[0061] Figure 12 is an exploded perspective view of a power generation cell C. It should be noted that the directions of front, back, top, bottom, left, and right in the following description are in the order of Figure 1 The directions indicated by the arrows in the middle are taken as reference. Figure 1 The front, back, top, bottom, left, and right directions shown are set for the convenience of concretely describing the configuration of each component in the power generation cell C, and do not represent absolute directions in the power generation cell C.

[0062] like Figure 1 As shown, the power generation cell C is composed of a membrane / electrode assembly 1 and a pair of separators (a cathode side separator 2 and an anode side separator 3) sandwiching the membrane / electrode assembly 1 as a set to form a unit cell.

[0063] The fuel cell is used as a fuel cell stack having a battery unit (not shown) in which such power generation cells C (unit cells) are stacked in the front-to-back direction. Figure 1 The electrolyte membrane / electrode assembly 1 shown has a cathode side separator 2 arranged in an arranged manner, an anode side separator 3 arranged back to back with respect to the cathode side separator 2, and an electrolyte membrane / electrode assembly (not shown) arranged opposite to the anode side separator 3 on the anode side.

[0064] In addition, when configuring Figure 1 The electrolyte membrane / electrode assembly 1 shown has an anode-side separator 3 disposed back-to-back with the cathode-side separator 2 disposed therebetween, and the electrolyte membrane / electrode assembly 1 (not shown) is arranged such that the cathode side faces the cathode-side separator 2 .

[0065] exist Figure 1 10a is a reaction gas supply port for supplying oxygen-containing gas (oxidant gas), 10b is a reaction gas discharge port for discharging hydrogen-containing gas (fuel gas), and 10c is a cooling medium supply port for supplying cooling medium (such as water, oil, etc.).

[0066] In addition, Figure 1 10d is a reaction gas outlet for discharging oxygen-containing gas (oxidant gas), 10e is a reaction gas supply outlet for supplying hydrogen-containing gas (fuel gas), and 10f is a cooling medium outlet for discharging cooling medium.

[0067] The above-mentioned reaction gas supply ports 10a, 10e, reaction gas exhaust ports 10d, 10b, cooling medium supply port 10c and cooling medium exhaust port 10f are respectively formed on the electrolyte membrane / electrode structure 1, the cathode side separator 2 and the anode side separator 3. Moreover, the reaction gas supply ports 10a, 10e, reaction gas exhaust ports 10d, 10b, cooling medium supply port 10c and cooling medium exhaust port 10f are each integrated when a plurality of power generation cells C are stacked, forming a connecting hole 10 extending in the front-rear direction.

[0068] The number of stacked power generation cells C (unit cells) can be set according to the power generation capacity required of the fuel cell. Incidentally, the fuel cell in this embodiment assumes that hundreds of cells are connected in series, but the present invention is not limited to this.

[0069] It should be noted that the cathode-side separator 2 and the anode-side separator 3 in the present embodiment are previously joined back-to-back to each other by welding or the like.

[0070] Although the fuel cell using such a power generation cell C is not shown in the figure, a terminal plate, an insulating plate, and an end plate are provided at both ends of a battery unit composed of a plurality of power generation cells C (unit cells) in order from the battery unit side toward the outside. In addition, the plurality of power generation cells constituting the battery unit are fastened together at the end plates at both ends with a predetermined load.

[0071] Thus, the cathode side separator 2 and the anode side separator 3 separate the reaction gas flow paths 21 (see Figure 3A ) and reaction gas flow path 31 (see Figure 3A ) is set to the inner side and clamps the electrolyte membrane / electrode structure 1 with a specified load.

[0072] Figure 2 is with Figure 1 The position of the arrow II portion corresponds to a partially enlarged top view of the power generation cell C (unit cell). Specifically, Figure 2 It is a partially enlarged plan view of the back surface of the cathode-side separator 2 in the power generation cell C. Figure 3A yes Figure 2 The IIIA-IIIA cross-sectional view of the power generation cell C shown in FIG. Figure 3A It is a cross-sectional view of the center position of a convex portion 21 a of a reaction gas flow path 21 described later when the power generation cell C is viewed from the front (front view). Figure 3B yes Figure 2 The IIIB-IIIB cross-sectional view of the power generation cell C shown in FIG. Figure 3B It is a cross-sectional view of the center position of a recessed portion 21 b of a reaction gas flow path 21 described later when the power generation cell C is viewed from the front (front view).

[0073] like Figure 2As shown, the back side of the cathode side separator 2 constituting the front of the power generation cell C is provided with a groove-shaped reaction gas flow path 21 (see Figure 3A ), the rib-shaped sealing portion 24 (see Figure 3A ) and the groove-shaped bypass flow path 25 (see Figure 3A ) is composed of an inverted concave and convex shape.

[0074] The inverted concavoconvex shape is formed when the cathode side separator 2 is produced by press forming a plate body made of metal. Figure 3A )、Sealing portion 24 (see Figure 3A ), bypass flow path 25 (see Figure 3A ) is formed by reversing the concave and convex shapes on the front and back (front and back) of the cathode side separator 2.

[0075] As will be described in detail later, the anode-side separator 3 (see Figure 1 ) also has a reaction gas flow path 31 (see Figure 3A )、Sealing portion 34 (see Figure 3A ) and bypass flow path 35 (see Figure 3A )’s flipped concave and convex shape.

[0076] 《Electrolyte membrane / electrode structure》

[0077] Electrolyte membrane / electrode structure 1 Figure 1 As shown, it is formed of a thin plate body having a rectangular planar shape that is long in the left-right direction.

[0078] When viewed from the front, the membrane / electrode assembly 1 has a rectangular membrane / electrode portion 5 in the center and a resin frame portion 13 that forms the outer periphery of the membrane / electrode assembly 1 by framing the periphery of the membrane / electrode portion 5 .

[0079] The resin frame 13 in this embodiment has the aforementioned reaction gas supply port 10a, reaction gas supply port 10b and cooling medium supply port 10c formed at the left end thereof, and reaction gas exhaust port 10d, reaction gas exhaust port 10e and cooling medium exhaust port 10f formed at the right end thereof.

[0080] The material of the resin frame 13 is not particularly limited as long as it is a proton non-conductive resin having a predetermined heat resistance, and an engineering plastic film such as polyphenylene sulfide (PPS) is preferred.

[0081] The electrolyte membrane / electrode portion 5 (see Figure 1 )like Figure 3A and Figure 3BAs shown, the structure includes an electrolyte membrane 11, a cathode 12a (oxygen electrode) formed on one surface of the electrolyte membrane 11, and an anode 12b (fuel electrode) formed on the other surface.

[0082] The electrolyte membrane 11 in the present embodiment is assumed to be a proton exchange membrane composed of a polymer solid electrolyte.

[0083] Although omitted from the figure, the cathode 12a and the anode 12b are constructed to include a catalyst layer and a gas diffusion layer composed of carbon paper or the like, wherein the catalyst layer is formed by coating an ion conductive resin composition containing a catalyst such as platinum on the surface of the gas diffusion layer on the side in contact with the electrolyte membrane 11.

[0084] In addition, the cathode 12a and the anode 12b in this embodiment are respectively as follows: Figure 3A and Figure 3B As shown, it partially overlaps with the resin frame portion 13 forming the outer periphery of the electrolyte membrane / electrode assembly 1 .

[0085] Specifically, the outer edge portions ( Figure 3A and Figure 3B The upper edge of the resin frame 13 is sandwiched in the front-rear direction. Figure 3A and Figure 3B The lower edge of the middle portion is configured in this manner.

[0086] It should be noted that in such an electrolyte membrane / electrode structure 1, Figure 3A and Figure 3B As shown, the region between the cathode 12 a and the anode 12 b sandwiching the electrolyte membrane 11 forms an electrochemically active power generation region A1 .

[0087] Incidentally, hydrogen-containing gas (fuel gas) is supplied to the anode 12b constituting the power generation region A1 from the first reaction gas flow path 32 described in detail later. The hydrogen reaching the catalyst layer (not shown) via the gas diffusion layer (not shown) of the anode 12b is decomposed into electrons and protons. The electrons are taken out to the external circuit connected to the anode 12b, and the protons pass through the electrolyte membrane 11 and reach the catalyst layer (not shown) of the cathode 12a constituting the power generation region A1.

[0088] On the other hand, an oxygen-containing gas (oxidant gas) is supplied to the cathode 12a from a first reaction gas flow path 22, which will be described in detail later. Oxygen reaches the catalyst layer (not shown) via the gas diffusion layer of the cathode 12a.

[0089] In the catalyst layer of the cathode 12a, protons and oxygen arriving from the electrolyte membrane 11 side and electrons arriving via the external circuit combine to generate water. In this series of processes, the flow of electrons taken out to the external circuit is used as generated power.

[0090] And, if Figure 3A and Figure 3B As shown in FIG. 1 , a region where the proton non-conductive resin frame 13 is disposed between the cathode 12 a and the anode 12 b serves as a non-power generation region A2 that does not contribute to power generation.

[0091] Figure 4 As the aforementioned electrolyte membrane / electrode structure 1 (see Figure 3A and Figure 3B ) is a cross-sectional view of an electrolyte membrane / electrode assembly 1A according to a modified example of the present invention. Figure 4 and Figure 3B Corresponding. Figure 4 In the case of the electrolyte membrane / electrode structure 1 (see Figure 3B ) The same components are marked with the same reference numerals and their detailed description is omitted. It should be noted that, Figure 4 The power generation cell C (see Figure 1 ) is a state in which the electrolyte membrane / electrode assembly 1A is stacked and a predetermined load is applied between the cathode side separator 2 and the anode side separator 3.

[0092] like Figure 4 As shown, the resin frame portion 13 constituting the outer peripheral portion of the electrolyte membrane / electrode assembly 1A is composed of a resin frame portion 13a and a resin frame portion 13b.

[0093] Specifically, the resin frame 13 includes a resin frame 13 a disposed adjacent to the cathode-side separator 2 and a resin frame 13 b disposed adjacent to the anode-side separator 3 .

[0094] The electrolyte membrane 11 of the electrolyte membrane / electrode assembly 1A is arranged to extend between the cathode 12a and the anode 12b to the edges of the cathode 12a and the anode 12b. That is, the cathode 12a and the anode 12b are formed and arranged to correspond to the membrane surface of the electrolyte membrane 11.

[0095] The resin frame 13a is disposed so as to be sandwiched between the end of the cathode 12a and the end of the electrolyte membrane 11. The cathode 12a and the electrolyte membrane 11 are bonded to the resin frame 13a at a portion sandwiching the resin frame 13a.

[0096] The resin frame 13b is disposed so as to be sandwiched between the end of the anode 12b and the end of the electrolyte membrane 11. The anode 12b and the electrolyte membrane 11 are bonded to the resin frame 13b at a portion sandwiching the resin frame 13b.

[0097] In addition, the length of the resin frame 13 b sandwiched between the anode 12 b and the electrolyte membrane 11 is longer than the length of the resin frame 13 a sandwiched between the cathode 12 a and the electrolyte membrane 11 .

[0098] Furthermore, the resin frame 13 a and the resin frame 13 b are bonded to each other as a whole except for a portion disposed between the cathode 12 a and the anode 12 b .

[0099] In such an electrolyte membrane / electrode structure 1A, Figure 4 As shown in FIG. 1 , the region where the cathode 12a and the anode 12b sandwich the electrolyte membrane 11 forms an electrochemically active power generation region A1. In addition, at least one of the resin frame 13a and the resin frame 13b is disposed between the cathode 12a and the anode 12b (in Figure 4 The area (the resin frame portion 13b) in the middle becomes a non-power generation area A2 that does not contribute to power generation.

[0100] According to such an electrolyte membrane / electrode structure 1A, Figure 4 As shown, the resin frame 13a and the resin frame 13b are arranged so as to sandwich the electrolyte membrane 11 between the cathode 12a and the anode 12b. This further improves the bonding strength of the resin frame 13 in the electrolyte membrane / electrode assembly 1A.

[0101] in addition, Figure 4 The electrolyte membrane / electrode structure 1A of the modified example shown is also configured to assume that the thickness of the portion having the resin frame 13a, 13b between the cathode 12a and the anode 12b in the stacking direction is thicker than the portion not having the resin frame 13a, 13b. Specifically, the electrolyte membrane / electrode structure 1A has a step difference of width D between the portion having the resin frame 13a, 13b and the portion not having the resin frame 13a, 13b between the cathode 12a and the anode 12b.

[0102] That is, the membrane / electrode assembly 1A allows some variation in thickness of the membrane / electrode assembly 1A, for example, depending on the design compression margin when stacking the gas diffusion layers used in the cathode 12a and the anode 12b.

[0103] exist Figure 4 In the membrane / electrode assembly 1A shown, a slope S is assumed to be formed in the section from the portion having the resin frames 13a and 13b to the portion not having the resin frames 13a and 13b. The slope S is configured to be formed mainly toward the anode 12b side rather than the cathode 12a side.

[0104] In the membrane electrode assembly 1A, the transition from the portion having the resin frames 13a and 13b to the portion not having the resin frames 13a and 13b is smooth. Specifically, the resin frame 13b disposed between the cathode 12a and the anode 12b is longer than the resin frame 13a.

[0105] On the other hand, the cathode-side separator 2 and the anode-side separator 3 sandwiching the membrane / electrode assembly 1A are elastically deformed by a load during stacking and are pressed against the membrane / electrode assembly 1A.

[0106] That is, in the portion having the resin frame 13 between the cathode 12 a and the anode 12 b , the anode-side separator 3 is press-bonded to the electrolyte membrane-electrode assembly 1A via the rib portion B1 formed between the reaction gas flow paths 31 .

[0107] In addition, in the portion between the cathode 12 a and the anode 12 b where the resin frame 13 is not provided, the anode-side separator 3 is press-bonded to the electrolyte membrane / electrode assembly 1A by means of a reinforcing rib B2 formed between the reaction gas flow paths 31 .

[0108] Furthermore, the reinforcing rib B1 is designed so that the contact surface with respect to the electrolyte membrane / electrode structure 1A is displaced in a direction away from the electrolyte membrane / electrode structure 1A compared to the contact surface at the reinforcing rib B2, so as to set the surface pressure with respect to the electrolyte membrane / electrode structure 1A to the same degree. That is, the anode side separator 3 has a step difference of width D between the reinforcing rib B1 and the reinforcing rib B2.

[0109] On the other hand, the ribs of the cathode-side separator 2 are arranged flush with each other without any step difference.

[0110] However, as described in detail later, it is assumed that the anode side separator 3 is set to have a larger flow path cross-sectional area and a longer spacing between the reaction gas flow paths 31 than the reaction gas flow paths 21 of the cathode side separator 2. As a result, the anode side separator 3 has more elastic deformation energy when pressed against the electrolyte membrane / electrode assembly 1A than the cathode side separator 2.

[0111] That is, the membrane electrode assembly 1A forms the slope S on the anode-side separator 3 side having a high elastic deformation energy during pressure contact, thereby ensuring good sealing performance between adjacent reaction gas flow paths 31 .

[0112] Partition

[0113] The reaction gas flow path 21 of the cathode side separator 2 is as follows Figure 2 As shown in FIG. 1 , the reaction gas flow path 21 extends from one end of the cathode side separator 2 toward the other end. Figure 2 When the power generation cell C shown is viewed from the front (front view), it is formed in the shape of a wave line with a constant wavelength and a constant amplitude.

[0114] The waveform of the reaction gas flow path 21 in this embodiment is different from a sine wave in that it has a straight line portion between troughs. However, the waveform of the reaction gas flow path 21 may also be a sine wave.

[0115] The reaction gas flow path 21 is arranged so as to be parallel to the meandering direction ( Figure 2 Specifically, the reaction gas flow paths 21 are arranged in a direction orthogonal to the left and right directions of the reaction gas flow paths 21. Figure 2 configured in a closely connected up and down direction.

[0116] like Figure 3A As shown, the cross-sectional shape of the reaction gas flow channel 21 is an isosceles trapezoid. Specifically, the cross-sectional shape of the reaction gas flow channel 21 is an isosceles trapezoid having a lower base longer than an upper base on the cathode 12a side.

[0117] The reaction gas flow path 21 of the cathode side separator 2 is as follows: Figure 2 and Figure 3A As shown, there are a first reaction gas flow channel 22 for supplying an oxygen-containing gas (reaction gas) to the cathode 12a constituting the power generation area A1, and a second reaction gas flow channel 23 arranged in parallel with the first reaction gas flow channel 22 so as to correspond to the non-power generation area A2.

[0118] The first reaction gas flow path 22 is as follows Figure 2 As shown in FIG. 1 , the position P1 of the upper edge is arranged so that at least a portion thereof contacts the electrolyte membrane 11 indicated by the hidden line (dashed line). Figure 2 As shown, the power generation cell C is divided into the power generation area A1 and the non-power generation area A2 described above with the edge of the electrolyte membrane 11 as a boundary.

[0119] The second reaction gas flow path 23 is as follows Figure 2 As shown in FIG. 1 , the upper edge position P2 is configured so that at least a portion of it contacts the cathode 12a represented by the hidden line (dashed line). Specifically, the second reaction gas flow path 23 is configured so that at least a portion of it contacts the cathode 12a (see FIG. 1 ). Figure 3A ) and the proton non-conductive resin frame 13 (see Figure 3A ) overlapping gas diffusion layers (not shown) are in contact.

[0120] Furthermore, the second reaction gas flow path 23 is as follows Figure 2 As shown, it is disposed between a sealing portion 24 and the first reaction gas flow path 22 to be described below and in parallel with the first reaction gas flow path 22 .

[0121] Figure 5 The electrolyte membrane / electrode structure 1 is viewed from the side Figure 1 The top view (rear view) of the cathode side separator 2 is shown. Figure 5 In the figure, for the convenience of drawing, a plurality of reaction gas flow paths 21 arranged in the up-down direction on the rear surface of the cathode side separator 2 are simplified.

[0122] like Figure 5 As shown, the sealing portion 24 of the cathode-side separator 2 is formed so as to surround the plurality of reaction gas flow paths 21 arranged in a rear view (planar view).

[0123] The sealing portion 24 is formed in an annular shape and integrally surrounds: the reaction gas supply port 10a for supplying oxygen-containing gas (oxidant gas) to the reaction gas flow path 21; the reaction gas discharge port 10d for discharging oxygen-containing gas (oxidant gas) from the reaction gas flow path 21; the introduction path 26 composed of a groove for guiding the oxygen-containing gas (oxidant gas) from the reaction gas supply port 10a to the reaction gas flow path 21; the discharge path 27 composed of a groove for guiding the oxygen-containing gas (oxidant gas) from the reaction gas flow path 21 to the reaction gas discharge port 10d; and the discharge path 28 for supplying oxygen-containing gas (oxidant gas) to the anode side separator 3 (see Figure 1 ) A reaction gas exhaust port 10d and a reaction gas supply port 10e for supplying and exhausting hydrogen-containing gas (fuel gas).

[0124] Such a sealing portion 24 is as follows Figure 3A and Figure 3B As shown, the leakage of oxygen-containing gas (oxidant gas) in the power generation cell C is prevented by contacting the resin frame portion 13 of the electrolyte membrane / electrode structure 1. Specifically, as described above, the rib-shaped sealing portion 24 is elastically deformed by the load when the cathode side separator 2 is stacked, and is pressed against the electrolyte membrane / electrode structure 1 to perform the sealing function of the oxygen-containing gas (oxidant gas).

[0125] It should be noted that in Figure 5 In the figure, reference numeral 4 is an opening sealing portion that surrounds the reaction gas supply port 10a and the reaction gas exhaust port 10d. The opening sealing portion 4 is also provided for supplying the anode side separator 3 (see Figure 1 ) for supplying and discharging hydrogen-containing gas (fuel gas) through the connecting hole 10, and for supplying and discharging hydrogen-containing gas (fuel gas) to the cathode side separator 2 and the anode side separator 3 (see Figure 1 ) between which the cooling medium is supplied and discharged.

[0126] return Figure 2 The sealing portion 24 in this embodiment is formed in a wave line shape with a constant wavelength and a constant amplitude at a portion adjacent to the reaction gas flow path 21 .

[0127] Specifically, the sealing portion 24 is formed outside the second reaction gas flow path 23 at each of the two end portions of the power generation cell C in the up-down width direction so as to be aligned with the second reaction gas flow path 23 .

[0128] That is, the power generation cell C of the present embodiment is constructed such that, on the outside of a plurality of first reaction gas flow paths 22 arranged in a manner to supply reaction gas to the power generation area A1, a second reaction gas flow path 23 is formed in a manner corresponding to the non-power generation area A2, and further, a sealing portion 24 is provided on the outside of the second reaction gas flow path 23 via a bypass flow path 25.

[0129] like Figure 2 As shown, the wavelength of the corrugation of the sealing portion 24 is formed to be half the wavelength of the corrugation of the reaction gas flow path 21. Furthermore, the convex portion 21a of the corrugation line of the second reaction gas flow path 23 is opposite to the concave portion 24b of the corrugation line of the sealing portion 24 in the vertical direction. In addition, the concave portion 21b of the corrugation line of the second reaction gas flow path 23 is opposite to the concave portion 24b of the corrugation line of the sealing portion 24.

[0130] Thus, the width of the bypass flow path 25 where the recessed portion 24 b of the sealing portion 24 faces the protruding portion 21 a of the second reaction gas flow path 23 is narrower than the width of the bypass flow path 25 where the recessed portion 24 b of the sealing portion 24 faces the recessed portion 21 b of the second reaction gas flow path 23 .

[0131] Fig. 6A yes Figure 5 A partial enlarged view of the VIA portion. Figure 6B yes Figure 5 A partial enlarged view of the VIB part.

[0132] like Fig. 6A As shown, in the cathode side separator 2 in the present embodiment, in the reaction gas flow path 21 on the reaction gas supply port 10a side, that is, in the upstream portion of the second reaction gas flow path 23 which is the reaction gas flow path 21 closest to the sealing portion 24, the convex portion 21a of the second reaction gas flow path 23 is also opposite to the concave portion 24b of the sealing portion 24.

[0133] in addition, Figure 6B As shown, the convex portion 21 a of the second reaction gas flow path 23 in the upstream portion of the second reaction gas flow path 23 of the reaction gas flow path 21 closest to the sealing portion 24 at the lower end side of the cathode side separator 2 also faces the concave portion 24 b of the sealing portion 24 .

[0134] It should be noted that in Fig. 6A and Figure 6B In the figure, the reference numeral F indicates the arrow from the reaction gas supply port 10a (see Fig. 6A ) flows of the reactant gas toward the reactant gas flow path 21 and the bypass flow path 25 via the introduction path 26. Reference symbol P1 is an electrolyte membrane 11 (see Figure 3A ) is located at the outer periphery of the cathode 12a (see Figure 3A) is located at the outer periphery of the Fig. 6A In the figure, reference numeral 28 denotes a communication passage that connects the reaction gas supply port 10a with the introduction passage 26 via the opening sealing portion 4. Figure 6B , reference numeral 10 is a separator 3 on the anode side (see Figure 1 ) is a connecting hole for supplying hydrogen-containing gas (fuel gas).

[0135] Figure 6C It is a partially enlarged plan view schematically showing a state in which the concave portion 24 b of the sealing portion 24 and the convex portion 21 a of the reaction gas flow path 21 face each other.

[0136] like Figure 6C As shown, the top 21 a 1 of the convex portion 21 a of the reaction gas flow channel 21 is located between the tops 24 a 1 of two adjacent convex portions 24 a of the sealing portion 24 .

[0137] Furthermore, it is assumed that the top 21 a 1 of the convex portion 21 a in the reaction gas flow path 21 is located on a straight line L connecting the tops 24 a 1 of two adjacent convex portions 24 a of the sealing portion 24 .

[0138] The convex portion 24a of the sealing portion 24 and the convex portion 21a of the reaction gas flow path 21 form a restriction portion that restricts the reaction gas (oxygen-containing gas) from flowing into the bypass flow path 25. That is, the restriction portion in the present embodiment is composed of a narrow interval that extends relatively long in the flow direction of the reaction gas. Specifically, the restriction portion is configured so that the inclined surfaces of the convex portion 24a and the convex portion 21a are close to each other. Compared with the restriction portion configured so that the top 24a1 of the convex portion 24a is opposite to the top 21a1 of the convex portion 21a, the restriction portion formed in such a manner that the inclined surfaces of the convex portion 24a and the convex portion 21a are close to each other can ensure a longer restriction length in the flow direction of the reaction gas.

[0139] In addition, Figure 6C As shown by the imaginary line (two-dot chain line), the top 21a1 of the convex portion 21a in the reaction gas flow path 21 can also be configured to protrude toward the sealing portion 24 beyond the straight line L. Thus, the inflow of the reaction gas (oxygen-containing gas) into the bypass flow path 25 is further effectively restricted.

[0140] Next, the anode side separator 3 (see Figure 1 ) for explanation.

[0141] like Figure 1 As shown, on the surface of the anode side separator 3 facing the electrolyte membrane / electrode structure 1, a reaction gas flow path 21 (see Figure 5 ) The corresponding method includes a reaction gas flow path 31.

[0142] In the anode-side separator 3 , the hydrogen-containing gas (fuel gas) supplied from the reaction gas supply port 10 eb to the introduction path 36 flows through the reaction gas flow path 31 and is discharged to the reaction gas discharge port 10 b via the discharge path 37 .

[0143] Such a reaction gas flow path 31 is connected to the reaction gas flow path 21 of the cathode side separator 2 (see Figure 5 ) Similarly, it extends from one end side of the anode side separator 3 toward the other end side. That is, Figure 1 The reaction gas flow path 31 shown is formed in a wave line shape having a constant wavelength and a constant amplitude and meandering in one direction from the left side to the right side.

[0144] Furthermore, the reaction gas flow path 31 is in the meandering direction ( Figure 1 The plurality of reaction gas flow paths 31 are arranged in a direction orthogonal to the left-right direction of the gas flow path 31 so that the phases of the waveforms are aligned with each other.

[0145] In addition, if Figure 3A and Figure 3B As shown, the cross-sectional shape of the reaction gas flow channel 31 is an isosceles trapezoidal shape.

[0146] Such a reaction gas flow path 31 is as follows Figure 3A and Figure 3B As shown, there is a first reaction gas flow path 32 for supplying hydrogen-containing gas (reaction gas) to the anode 12b constituting the power generation area A1, and a second reaction gas flow path 33 arranged on the first reaction gas flow path 32 in a manner corresponding to the non-power generation area A2. And, the first reaction gas flow path 32 is arranged in a manner such that at least a portion is in contact with the electrolyte membrane 11. In addition, the separator portion forming the second reaction gas flow path 33 and the separator portion forming the second reaction gas flow path 23 of the cathode side separator 2 sandwich the resin frame portion 13 between the cathode 12a and the anode 12b.

[0147] The reaction gas flow path 31 of the anode side separator 3 is as follows: Figure 3A and Figure 3B As shown, it is assumed that the flow path cross-sectional area is set larger than that of the reaction gas flow path 21 of the cathode side separator 2, and the spacing of the reaction gas flow path 31 is long. In addition, although the figure is omitted, the wavelength of the waveform in the reaction gas flow path 31 of the anode side separator 3 is set to be the same as the wavelength of the reaction gas flow path 21 of the cathode side separator 2, but it is not limited to this. By the way, when the reaction gas flow path 31 and the reaction gas flow path 21 are set to have the same wavelength, it is preferable to configure them in a manner that the phases are staggered with each other.

[0148] exist Figure 1 In the figure, reference numeral 34 is a sealing portion of the anode side separator 3. The sealing portion 34 is Figure 1When viewed from the front (planar view) as shown, the seal portion 24 (see Figure 5 That is, the sealing portion 34 is formed so as to integrally surround the reaction gas flow path 31, the reaction gas supply port 10e, the reaction gas exhaust port 10b, the introduction path 36, the exhaust path 37, and the cathode side separator 2 (see Figure 1 ) A reaction gas supply port 10a and a reaction gas exhaust port 10d for supplying and exhausting oxygen-containing gas (oxidant gas).

[0149] Such a sealing portion 34 is as follows Figure 3A and Figure 3B As shown, the leakage of hydrogen-containing gas (fuel gas) in the power generation cell C is prevented by contacting the resin frame portion 13 of the electrolyte membrane / electrode structure 1. Specifically, as described above, the rib-shaped sealing portion 34 is elastically deformed by the load when the anode side separator 3 is stacked, and is pressed against the electrolyte membrane / electrode structure 1, thereby performing the sealing function of the hydrogen-containing gas (fuel gas).

[0150] In this embodiment, the sealing portion 34 is as follows Figure 1 As shown, a portion adjacent to the reaction gas flow path 31 is formed into a wave line shape with a constant wavelength and a constant amplitude.

[0151] In addition, the sealing portion 34 is as Figure 3A and Figure 3B As shown, it is formed outside the second reaction gas flow path 33 in the vertical width direction of the power generation cell C so as to be parallel to the second reaction gas flow path 33 .

[0152] That is, the anode side separator 3 in the present embodiment is constructed such that a second reaction gas flow path 33 is formed on the outside of a plurality of first reaction gas flow paths 32 arranged in a manner to supply reaction gas to the power generation area A1 in a manner corresponding to the non-power generation area A2, and further, a sealing portion 34 is provided on the outside of the second reaction gas flow path 33 via a bypass flow path 35.

[0153] Although not shown in the figure, the wavelength of the waveform of the sealing portion 34 is similar to that of the sealing portion 24 ( Figure 6C ) and reaction gas flow path 21 ( Figure 6C ) is similarly assumed to be formed to be half the wavelength of the waveform of the reaction gas flow path 31. Figure 6C It is also shown in the figure that the top 31a1 of the convex portion 31a in the reaction gas flow path 31 is located on the straight line L connecting the tops 34a1 of two adjacent convex portions 34a of the sealing portion 34 or protrudes toward the sealing portion 34 beyond the straight line L. Such a convex portion 31a of the reaction gas flow path 31 and the convex portion 34a of the sealing portion 34 form a restriction portion that restricts the flow of the reaction gas (hydrogen-containing gas) into the bypass flow path 35.

[0154] It should be noted that in Figure 1 In the figure, reference numeral 4 is an opening sealing portion that surrounds the reaction gas outlet 10b and the reaction gas outlet 10d. The opening sealing portion 4 is also provided in the connecting hole 10 for supplying and discharging the oxygen-containing gas (oxidant gas) and the connecting hole 10 for supplying and discharging the cooling medium.

[0155] <Effects>

[0156] Next, the effects of the power generation cell C of this embodiment will be described.

[0157] Conventional power generation cells (see, for example, Patent Document 1) include a restriction member that intercepts a bypass flow of a reaction gas.

[0158] Such a limiting component increases the reaction rate of the reactant gas in the power generation area, but on the other hand, it may cause a surface pressure deviation due to the deflection of the partition. That is, in the existing power generation cell with a limiting component (for example, see Patent Document 1), the increase in the reaction rate of the reactant gas and the suppression of the surface pressure deviation of the partition have a contradictory relationship. In particular, this tendency is prominent in the power generation cell in which the limiting component is composed of a rib extending in a direction intersecting the extension direction of the reactant gas flow path.

[0159] In contrast, the cathode side separator 2 of the power generation cell C of this embodiment is configured such that the top 21a1 of the convex portion 21a of the reaction gas flow path 21 is located on the straight line L connecting the tops 24a1 of two adjacent convex portions 24a of the sealing portion 24 or protrudes beyond the straight line L toward the sealing portion 24.

[0160] The bypass flow path 25 of the power generation cell C is formed by the concave portion 24b of the sealing portion 24 and the convex portion 21a of the reactive gas flow path 21 facing thereto, forming a restricting portion for restricting the inflow of the reactive gas in a narrow space extending long in the reactive gas flow direction.

[0161] According to the power generation cell C having such a cathode side separator 2, the flow rate of the reaction gas that is about to bypass the power generation area A1 is reduced by the restriction portion formed by the convex portion 24a of the sealing portion 24 and the convex portion 21a of the reaction gas flow path 21 (second reaction gas flow path 23). As a result, the power generation cell C can increase the reaction rate of the reaction gas in the power generation area A1.

[0162] In addition, in the power generation cell C of the present embodiment, when the power generation cell C is stacked at a predetermined load, even if the cathode side separator 2 has deflection, the cathode side separator 2 is allowed to extend in the arrangement direction of the reaction gas flow path 21 and eliminate the deflection at the portion corresponding to the bypass flow path 25. As a result, the power generation cell C can more reliably prevent the cathode side separator 2 from having a surface pressure deviation.

[0163] In addition, in the anode side separator 3 of the power generation cell C of the present embodiment, it is also assumed that the top 31a1 of the convex portion 31a of the reaction gas flow path 31 is located on the straight line L connecting the tops 34a1 of two adjacent convex portions 34a of the sealing portion 34 or protrudes beyond the straight line L toward the sealing portion 24 side.

[0164] That is, the power generation cell C can more effectively prevent the reaction gas from leaking from the gas flow paths 21 , 31 and the sealing portions 24 , 34 than in the related art.

[0165] In addition, in the power generation cell C of the present embodiment, in the reaction gas flow paths 21, 31 on the reaction gas supply ports 10a, 10e side, that is, the upstream portion of the reaction gas flow paths 21, 31 closest to the sealing portions 24, 34, the convex portion 21a of the reaction gas flow paths 21, 31 is also opposite to the concave portion 24b of the sealing portions 24, 34.

[0166] According to such power generation cell C, the flow rate of the reaction gas that is about to bypass the power generation area A1 can be reduced more reliably. The power generation cell C can further increase the reaction rate of the reaction gas in the power generation area A1.

[0167] In addition, the cathode-side separator 2 of the power generation cell C of the present embodiment includes a plurality of first reaction gas flow paths 22 arranged in a manner to supply reaction gas to the power generation area A1, and a second reaction gas flow path 23 provided between the sealing portion 24 and the first reaction gas flow path 22 in a manner corresponding to the non-power generation area A2. The plurality of first reaction gas flow paths 22 and the second reaction gas flow paths 23 are formed so that the phases of the respective wave lines coincide with each other.

[0168] In addition, the anode side separator 3 also includes a plurality of first reaction gas flow paths 32 arranged in a manner to supply reaction gas to the power generation area A1, and a second reaction gas flow path 33 provided between the sealing portion 34 and the first reaction gas flow path 32 in a manner corresponding to the non-power generation area A2. In addition, the power generation cell C is assumed to be formed such that the plurality of first reaction gas flow paths 32 and the second reaction gas flow paths 33 are formed in phase with each other in the form of respective wave lines.

[0169] In such power generation cells C, when the power generation cells C are stacked, the formation portions of the reaction gas flow paths 21 and 31 tend to extend to the portions corresponding to the bypass flow paths 25 and 35 in order to eliminate the deflection. At this time, the reaction gas flow paths 21 and 31 are composed of a plurality of first reaction gas flow paths 22 and 32 and second reaction gas flow paths 23 and 33 arranged in a row, and the phases of the respective wave lines are mutually consistent, so the formation portions of the reaction gas flow paths 21 and 31 are uniformly extended in the direction along the respective surfaces of the cathode side separator 2 and the anode side separator 3. Therefore, the occurrence of surface pressure deviation in the cathode side separator 2 and the anode side separator 3 is further reliably prevented.

[0170] Furthermore, in the cathode-side separator 2 of the power generation cell C of the present embodiment, the second reaction gas flow path 23 is in contact with the gas diffusion layer of the cathode 12 a extending to the non-power generation area A2 .

[0171] According to such a power generation cell C, water generated at the cathode 12a in the power generation area A1 partially moves to the gas diffusion layer of the cathode 12a in the non-power generation area A2 due to the capillary phenomenon.

[0172] The generated water that has moved to the cathode 12 a in the non-power generation area A2 is discharged together with the reaction gas (oxygen-containing gas) flowing through the second reaction gas flow path 23 .

[0173] According to such power generation cell C, water generated at cathode 12a is discharged along with the reaction gas through both first reaction gas flow path 22 and second reaction gas flow path 23. Flooding of cathode 12a caused by water generated by power generation can be more reliably prevented.

[0174] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be implemented in various forms.

[0175] Figure 7 This is a partially enlarged top view of the cathode side separator 2 in the power generation cell C of another embodiment, which is similar to the one in the above embodiment. Fig. 6A The corresponding figure. Figure 7 In the present invention, the same components as those in the above-described embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

[0176] Figure 7 The cathode side separator 2 of the power generation cell C shown in FIG. Fig. 6A Unlike the cathode-side separator 2 shown, a top portion 21 a 1 of the convex portion 21 a of the reaction gas flow channel 21 and a top portion 24 a 1 of the convex portion 24 a of the sealing portion 24 are formed at opposing positions.

[0177] In addition, in the reaction gas flow path 21 on the reaction gas supply port 10a side, that is, the upstream part of the reaction gas flow path 21 closest to the sealing part 24, the top 21a1 of the convex part 21a of the reaction gas flow path 21 and the top 24a1 of the convex part 24a of the sealing part 24 are also formed at opposing positions.

[0178] In the power generation cell C, the convex portion 24 a of the sealing portion 24 and the convex portion 21 a of the reactive gas flow path 21 form a restriction portion that restricts the inflow of the reactive gas into the bypass flow path 25 .

[0179] In addition, this configuration is not limited to the cathode-side separator 2 , but can also be applied to the anode-side separator 3 .

[0180] According to such a power generation cell C, it becomes easy to set the interval (align) between the convex portions 24a, 34a of the sealing portions 24, 34 and the convex portions 21a, 31a of the reaction gas flow paths 21, 31, and the degree of freedom in designing the restricting portion is improved.

[0181] In addition, in the aforementioned embodiment, the wavelength of the waveform of the sealing portion 24, 34 is set to half the wavelength of the waveform of the reaction gas flow paths 21, 31, but is not limited to this. It can be appropriately set by providing a restriction portion for the reaction gas between the convex portions 24a, 34a of the sealing portion 24, 34 and the convex portions 21a, 31a of the reaction gas flow paths 21, 31.

[0182] In addition, the sealing portions 24 and 34 in the above-mentioned embodiment use the reinforcing ribs of the cathode side separator 2 and the anode side separator 3, but the sealing portion composed of the elastic member may also be provided in a wavy shape. In addition, the sealing portion may also be provided with an elastic member on the top surface of the reinforcing ribs of the cathode side separator 2 and the anode side separator 3.

Claims

1. A power generation cell, comprising: An electrolyte membrane / electrode structure having electrodes on both sides of the electrolyte membrane; A resin frame portion provided on the outer periphery of the electrolyte membrane / electrode structure; as well as separators, which are arranged on both sides of the electrolyte membrane / electrode structure, The power generation cell is characterized in that The separator is a plate-shaped member made of metal, and is provided with: a wave-shaped reaction gas flow path, which allows the reaction gas to flow from one end of the separator to the other end along the electrolyte membrane / electrode structure; and a sealing portion, which surrounds the reaction gas flow path in a state of contact with the resin frame portion to prevent the reaction gas from leaking. The sealing portion has a plurality of tops bulging toward the reaction gas flow path, and the top of the reaction gas flow path bulging toward the sealing portion is located on a straight line connecting two adjacent tops of the sealing portion or protrudes toward the sealing portion beyond the straight line.

2. The power generation cell according to claim 1, characterized in that: The separator is provided with a reaction gas supply port for supplying reaction gas to the reaction gas flow path. The top portion of the reaction gas flow path on the reaction gas supply port side that bulges toward the sealing portion is located between two adjacent top portions of the sealing portion. A restricting portion that restricts the flow of the reaction gas into the reaction gas flow path between the sealing portions is formed by the convex portion forming the top of the sealing portion and the convex portion forming the top of the reaction gas flow path.

3. A power generation cell, comprising: An electrolyte membrane / electrode structure having electrodes on both sides of the electrolyte membrane; A resin frame portion provided on the outer periphery of the electrolyte membrane / electrode structure; as well as separators, which are arranged on both sides of the electrolyte membrane / electrode structure, The power generation cell is characterized in that The separator is a plate-shaped member made of metal, and is provided with: a wave-shaped reaction gas flow path, which allows the reaction gas to flow from one end of the separator to the other end along the electrolyte membrane / electrode structure; a sealing portion, which surrounds the reaction gas flow path in a state of contact with the resin frame portion to prevent leakage of the reaction gas, The sealing portion has a top portion bulging toward the reaction gas flow path, and the top portion of the reaction gas flow path bulging toward the sealing portion is formed at a position opposite to the top portion of the sealing portion bulging toward the reaction gas flow path.

4. The power generation cell according to claim 3, characterized in that: The separator is provided with a reaction gas supply port for supplying reaction gas to the reaction gas flow path. The top of the reaction gas flow path on the reaction gas supply port side that bulges toward the sealing portion is provided at a position opposite to the top of the sealing portion. A restriction portion for restricting the flow of the reaction gas into the reaction gas flow path between the sealing portions is formed by the convex portion forming the top of the sealing portion and the convex portion forming the top of the reaction gas flow path.

5. The power generation cell according to claim 1 or 3, characterized in that: The reaction gas flow path comprises: a plurality of first reaction gas flow paths arranged so as to supply reaction gas to the power generation region of the electrolyte membrane / electrode assembly; and a second reaction gas flow path arranged in parallel with the first reaction gas flow path between the sealing portion and the first reaction gas flow path so as to correspond to the non-power generation region of the electrolyte membrane / electrode assembly; The plurality of first reaction gas flow channels and the plurality of second reaction gas flow channels are formed so that the phases of the wave lines thereof coincide with each other.

6. The power generation cell according to claim 5, characterized in that: The outer periphery of the electrolyte membrane / electrode structure has a non-power generation region where the electrode and the resin frame partially overlap. The second reaction gas flow path is in contact with the gas diffusion layer of the electrode.

Images