JP2015198068A - fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the accurate and reliable positioning between an electrolyte membrane-electrode structure with a frame and a separator, with a simple and economic constitution.SOLUTION: In a power generation unit 12 constituting a fuel cell 10, an electrolyte membrane-electrode structure 14 with a frame is held by a cathode-side separator 16 and an anode-side separator 18. The electrolyte membrane-electrode structure 14 with the frame has a rectangle shape, and in the outer periphery of one short side 50a of a resin frame member 50, a notch 62 is formed by piercing the electrolyte membrane-electrode structure 14 in the width direction.

Description

  The present invention has an electrolyte membrane / electrode structure in which electrodes are respectively disposed on both sides of a solid polymer electrolyte membrane, and has a frame in which a resin frame member is provided around the outer periphery of the electrolyte membrane / electrode structure The present invention relates to a fuel cell in which an electrolyte membrane / electrode structure and a separator are stacked.

  In general, a polymer electrolyte fuel cell employs a polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell includes an electrolyte membrane / electrode structure (MEA) in which an anode electrode is disposed on one side of a solid polymer electrolyte membrane and a cathode electrode is disposed on the other side of the solid polymer electrolyte membrane. . The electrolyte membrane / electrode structure is sandwiched between separators (bipolar plates) to constitute a fuel cell. A predetermined number of the fuel cells are stacked, for example, mounted on a fuel cell electric vehicle as an in-vehicle fuel cell stack.

  In the fuel cell, the electrolyte membrane / electrode structure may not be configured to be rotationally symmetric with respect to the axis in the stacking direction passing through the center point. Therefore, if the electrolyte membrane / electrode structure is erroneously rotated 180 degrees from the normal position in the fuel cell, that is, assembled in the opposite direction, there may be a problem in the flowability and sealing performance of the reaction gas. .

  In order to avoid this problem, for example, a polymer electrolyte fuel cell disclosed in Patent Document 1 is known. In this fuel cell, the separator is provided with a plurality of reaction gas communication holes penetrating in the laminating direction along two opposite sides. In the gas diffusion layer constituting one electrode (for example, an electrode having a smaller planar dimension than the other electrode), a plurality of reaction gas communication holes are formed on the side corresponding to any one of the two sides. At least one notch is provided at the position.

  For this reason, the assembly posture of the electrolyte membrane / electrode structure can be reliably and easily determined only by using the notch as a reference, and the electrolyte membrane / electrode structure is assembled to the fuel cell in an upside down posture. There is nothing. Therefore, with a simple and compact configuration, it is possible to reliably prevent misassembly of the electrolyte membrane / electrode structure, and the assembly workability of the fuel cell stack is improved satisfactorily.

JP 2011-70822 A

  The present invention has been made in connection with this type of misassembly prevention structure, and it is possible to accurately and reliably position the framed electrolyte membrane / electrode structure and the separator with a simple and economical configuration. An object of the present invention is to provide a simple fuel cell.

  The fuel cell according to the present invention has an electrolyte membrane / electrode structure in which electrodes are respectively disposed on both sides of a solid polymer electrolyte membrane, and a resin frame member circulates around the outer periphery of the electrolyte membrane / electrode structure. A framed electrolyte membrane / electrode structure is provided. The framed electrolyte membrane / electrode structure is laminated with a separator.

  In the fuel cell, the framed electrolyte membrane / electrode structure has a rectangular shape, and a notch is formed in the outer periphery of one short side of the resin frame member in the thickness direction. .

  In this fuel cell, it is preferable that one short side is provided with a first inclined portion and a second inclined portion that are inclined with respect to each other. At that time, a wall surface extending linearly toward the inner side of the resin frame member is formed at the end portion of the first inclined portion on the second inclined portion side, and the wall surface defines one side surface of the notch portion. It is preferable to configure.

  Furthermore, in this fuel cell, it is preferable that the closed end portion of the notch portion is constituted by a wall surface curved in an arc shape.

  Furthermore, in this fuel cell, it is preferable that the separator is provided with a protruding portion disposed in the cutout portion so as to protrude in the thickness direction from the separator surface.

  According to the present invention, the notch provided in one short side of the resin frame member penetrates in the thickness direction, and the framed electrolyte membrane / electrode structure is misassembled by using the notch. Can be prevented. For example, when a protrusion disposed at the notch is provided, when the framed electrolyte membrane / electrode structure is in an incorrect posture, the other short side of the resin frame member abuts on the protrusion, and assembly work is performed. Can not do.

  Moreover, the notch can be provided integrally when the resin frame member is molded. For this reason, it is not necessary to newly provide a notch process, and it can suppress that the number of manufacturing processes increases.

  Accordingly, it becomes possible to accurately and reliably position the framed electrolyte membrane / electrode structure and the separator with a simple and economical configuration, and the manufacturing operation of the fuel cell is efficiently performed.

It is a disassembled perspective explanatory drawing of the electric power generation unit which comprises the fuel cell which concerns on the 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. 1 of the said electric power generation unit. It is front explanatory drawing of the electrolyte membrane and electrode structure with a frame which comprises the said electric power generation unit. It is a disassembled perspective explanatory drawing of the jig | tool for manufacturing the said electric power generation unit, the said electrolyte membrane and electrode structure with a frame, and a cathode side separator. It is a principal part perspective explanatory drawing at the time of arrange | positioning in the said jig | tool in the state in which the said electrolyte membrane with a frame and electrode structure were reversed. It is a disassembled perspective explanatory drawing of the electric power generation unit which comprises the fuel cell which concerns on the 2nd Embodiment of this invention.

  As shown in FIG. 1, the fuel cell 10 according to the first embodiment of the present invention is configured by stacking a plurality of power generation units 12 in an arrow A direction (horizontal direction) or an arrow C direction (gravity direction). . The fuel cell 10 constitutes, for example, an in-vehicle fuel cell stack and is mounted on a fuel cell vehicle (fuel cell electric vehicle) (not shown).

  As shown in FIGS. 1 and 2, the power generation unit 12 sandwiches a framed electrolyte membrane / electrode structure (framed MEA) 14 between a cathode side separator 16 and an anode side separator 18. The cathode side separator 16 and the anode side separator 18 have a horizontally long (or vertically long) rectangular shape.

  The cathode-side separator 16 and the anode-side separator 18 are constituted by, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a thin plate-like metal plate whose surface is subjected to anticorrosion treatment. The metal plate has a rectangular shape on the plane and is formed into a concavo-convex shape by pressing into a wave shape. The cathode side separator 16 and the anode side separator 18 may be constituted by a carbon separator.

  As shown in FIG. 1, an oxidant gas inlet communication hole 22a and a fuel gas outlet communication hole 24b are provided at one end edge of the cathode side separator 16 and the anode side separator 18 in the long side direction (arrow B direction). The oxidant gas inlet communication holes 22a communicate with each other in the direction of arrow A to supply an oxidant gas, for example, an oxygen-containing gas, while the fuel gas outlet communication holes 24b communicate with each other in the direction of arrow A to provide fuel. A gas, for example a hydrogen-containing gas, is discharged.

  A fuel gas inlet communication hole 24a and an oxidant gas outlet communication hole 22b are provided at the other end edges of the cathode side separator 16 and the anode side separator 18 in the long side direction (arrow B direction). The fuel gas inlet communication holes 24a communicate with each other in the direction of arrow A to supply fuel gas, while the oxidant gas outlet communication holes 22b communicate with each other in the direction of arrow A to discharge the oxidant gas.

  A pair of cooling media for supplying a cooling medium in close proximity to the oxidant gas inlet communication hole 22a at both ends in the short side direction (arrow C direction) of the power generation unit 12 and communicating with each other in the arrow A direction An inlet communication hole 26a is provided. A pair of cooling medium outlet communication holes 26b for discharging the cooling medium is provided near both ends of the short side direction (arrow C direction) of the power generation unit 12 near the fuel gas inlet communication hole 24a side.

  Knock holes 27a and 27b are formed at substantially the center in the direction of arrow C at one end edge and the other end edge in the long side direction of the power generation unit 12, respectively. Positioning between the cathode side separator 16 and the anode side separator 18 is performed in the power generation unit 12 by inserting a knock pin made of resin (not shown) into each of the knock holes 27a and 27b.

  An oxidant gas flow path 28 communicating with the oxidant gas inlet communication hole 22a and the oxidant gas outlet communication hole 22b is formed on the surface 16a of the cathode side separator 16 facing the electrolyte membrane / electrode structure 14 with a frame. . The oxidant gas flow channel 28 has a plurality of linear flow channel grooves (may be wavy flow channel grooves) extending in the arrow B direction.

  An inlet buffer portion 30a and an outlet buffer portion 30b are provided in the vicinity of the inlet and the outlet of the oxidant gas channel 28 so as to be located outside the power generation region. The inlet buffer portion 30a and the outlet buffer portion 30b each have a plurality of embosses (or line-shaped channel grooves). A plurality of inlet connection grooves 32a are formed between the inlet buffer portion 30a and the oxidant gas inlet communication hole 22a. A plurality of outlet connection grooves 32b are formed between the outlet buffer portion 30b and the oxidizing gas outlet communication hole 22b.

  A part of the cooling medium flow path 34 that connects the pair of cooling medium inlet communication holes 26 a and the pair of cooling medium outlet communication holes 26 b is formed on the surface 16 b of the cathode separator 16. The cooling medium flow path 34 is formed by overlapping the back surface shape of the oxidant gas flow path 28 and the back surface shape of the fuel gas flow path 36 described later.

  As shown in FIG. 1, a fuel gas flow path 36 that connects a fuel gas inlet communication hole 24 a and a fuel gas outlet communication hole 24 b to the surface 18 a of the anode separator 18 facing the framed electrolyte membrane / electrode structure 14. Is formed. The fuel gas flow channel 36 has a plurality of linear flow channel grooves (may be wavy flow channel grooves) extending in the arrow B direction.

  An inlet buffer portion 38a and an outlet buffer portion 38b are provided in the vicinity of the inlet and the outlet of the fuel gas flow path 36, located outside the power generation region. Each of the inlet buffer portion 38a and the outlet buffer portion 38b has a plurality of embosses (or line-shaped channel grooves).

  A plurality of supply connection paths 40a are formed between the inlet buffer portion 38a and the fuel gas inlet communication hole 24a. A plurality of discharge connection paths 40b are formed between the outlet buffer portion 38b and the fuel gas outlet communication hole 24b. The plurality of supply connection paths 40a are covered with a lid member 42a, while the plurality of discharge connection paths 40b are covered with a lid member 42b.

  As shown in FIGS. 1 and 2, the first seal member 44 is integrally formed on the surfaces 16 a and 16 b of the cathode separator 16 so as to go around the outer peripheral edge of the cathode separator 16. A second seal member 46 is integrally formed on the surfaces 18 a and 18 b of the anode side separator 18 around the outer peripheral edge of the anode side separator 18.

  As the first seal member 44 and the second seal member 46, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material Alternatively, a sealing material having elasticity such as a packing material is used.

  The first seal member 44 has a flat seal portion (seal base) 44 f having a uniform thickness along the surface direction of the cathode-side separator 16. A convex seal portion 44 a that seals the oxidant gas, the fuel gas, and the cooling medium in an air-tight and liquid-tight manner is integrally formed on the flat seal portion 44 f of the first seal member 44.

  The second seal member 46 includes a flat seal portion (seal base) 46 f having a uniform thickness along the surface direction of the anode-side separator 18. A convex seal portion 46 a that seals the oxidant gas, the fuel gas, and the cooling medium in an airtight and liquid-tight manner is integrally formed on the flat seal portion 46 f of the second seal member 46.

  As shown in FIGS. 1 to 3, the framed electrolyte membrane / electrode structure 14 includes an electrolyte membrane / electrode structure (MEA) 48 and a resin provided around the outer periphery of the electrolyte membrane / electrode structure 48. A frame member 50.

  As shown in FIG. 2, the electrolyte membrane / electrode structure 48 includes, for example, a solid polymer electrolyte membrane (cation exchange membrane) 52 in which a perfluorosulfonic acid thin film is impregnated with water. The solid polymer electrolyte membrane 52 is sandwiched between the cathode electrode 54 and the anode electrode 56.

  The cathode electrode 54 constitutes a so-called stepped MEA having a planar dimension smaller than that of the anode electrode 56 and the solid polymer electrolyte membrane 52. The cathode electrode 54, the anode electrode 56, and the solid polymer electrolyte membrane 52 may be set to the same plane size. Further, the anode electrode 56 may have a planar dimension smaller than the planar dimension of the cathode electrode 54 and the solid polymer electrolyte membrane 52.

  The cathode electrode 54 and the anode electrode 56 are formed by uniformly applying a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the gas diffusion layer. And an electrode catalyst layer (not shown) to be formed. The electrode catalyst layer is formed on both surfaces of the solid polymer electrolyte membrane 52, for example.

  As shown in FIGS. 1 to 3, the electrolyte membrane / electrode structure 48 is located outside the terminal portion of the cathode electrode 54, and the resin frame member 50 is integrated with the outer peripheral edge of the solid polymer electrolyte membrane 52. Is done. As the resin material constituting the resin frame member 50, for example, engineering plastics, super engineering plastics, etc. are adopted in addition to general-purpose plastics having electrical insulation. The resin frame member 50 may be made of, for example, a film.

  The outer shape of the resin frame member 50 includes an oxidant gas inlet communication hole 22a, a fuel gas inlet communication hole 24a, a cooling medium inlet communication hole 26a, an oxidant gas outlet communication hole 22b, a fuel gas outlet communication hole 24b, and a cooling medium outlet communication. It is set to the dimension arrange | positioned inside the hole 26b.

  As shown in FIG. 3, one short side 50 a of the resin frame member 50 is provided with a first inclined portion 58 a and a second inclined portion 58 b that are inclined outward in the direction in which they are close to each other (short side center side). It is done. The first inclined portion 58a is inclined along the inclined shape of the oxidant gas inlet communication hole 22a, and the second inclined portion 58b is inclined along the inclined shape of the fuel gas outlet communication hole 24b. The other short side 50b of the resin frame member 50 has a first inclined portion 60a inclined along the inclined shape of the oxidant gas outlet communication hole 22b and a first inclined portion 60a inclined along the inclined shape of the fuel gas inlet communication hole 24a. 2 inclined portions 60b are provided.

  On the outer periphery of one short side 50a of the resin frame member 50, a notch 62 is formed between the oxidant gas inlet communication hole 22a and the fuel gas outlet communication hole 24b and penetrates in the thickness direction. The A wall surface 58as that extends linearly toward the inside of the resin frame member 50 is formed at the end of the first inclined portion 58a on the second inclined portion 58b side. The wall surface 58as constitutes one side surface of the notch 62. The closing side end 62e of the notch 62 is constituted by a wall surface curved in an arc shape. The end of the side surface (the other side surface) of the second inclined portion 58b on the first inclined portion 58a side is continuous with the flat portion 58bf. In addition, the notch part is not provided in the outer periphery of the short side 50b of the resin frame member 50. FIG. The resin frame member 50 has a point-symmetric shape except for the notch 62.

  As shown in FIGS. 1 and 2, the resin frame member 50 and the cathode-side separator 16 are fixed to each other by a plurality of welding portions 64. The welding part 64 can be spot-formed by various heating devices such as a laser heating device in addition to an electric heater.

  An operation for manufacturing the power generation unit 12 configured as described above will be described below.

  As shown in FIG. 4, a jig 70 is prepared to weld the framed electrolyte membrane / electrode structure 14 and the cathode separator 16. A recess 72 is formed on the mounting surface 70 a of the jig 70 along the outer shape of the framed electrolyte membrane / electrode structure 14. The depth of the recess 72 is set to be substantially the same as the thickness of the framed electrolyte membrane / electrode structure 14. On the wall surface 72w forming the concave portion 72, a convex portion 72wt disposed so as to enter the notch portion 62 of the resin frame member 50 is provided integrally or as a separate member. The placement surface 70a is provided with a desired number of positioning portions 74 for positioning the cathode-side separator 16 around the recess 72 at a desired position. In the first embodiment, two each are provided at positions corresponding to the four corners of the cathode separator 16.

  Therefore, after the electrolyte membrane / electrode structure 14 with a frame is accommodated in the recess 72 of the jig 70, the cathode separator 16 is placed on the placement surface 70a so as to overlap the electrolyte membrane / electrode structure 14 with a frame. The

  Since the cathode separator 16 is positioned via the positioning portion 74, the cathode separator 16 and the framed electrolyte membrane / electrode structure 14 are positioned relative to each other. In this state, a desired part of the resin frame member 50 is heated and melted, and the resin frame member 50 and the cathode-side separator 16 are integrated by the welding part 64.

  After the framed electrolyte membrane / electrode structure 14 and the cathode separator 16 are integrated, the framed electrolyte membrane / electrode structure 14 has an anode side separator 18 on the opposite side of the cathode side separator 16. Be placed. The cathode side separator 16 and the anode side separator 18 are relatively positioned by using knock pins (not shown) inserted into the knock holes 27a and 27b. These are fixed as necessary to produce the power generation unit 12.

  In this case, in the first embodiment, as shown in FIG. 4, a cutout portion 62 is formed on the outer periphery of one short side 50 a of the resin frame member 50 so as to penetrate in the thickness direction. A concave portion 72 is formed in the jig 70 along the outer shape of the resin frame member 50, and a convex portion 72wt disposed on the wall surface 72w forming the concave portion 72 so as to enter the notch portion 62. Is provided.

  For this reason, as shown in FIG. 5, when the framed electrolyte membrane / electrode structure 14 is rotated 180 degrees from the normal posture with respect to the recess 72 of the jig 70 and disposed in the opposite direction, The short side 50b is in contact with the convex portion 72wt. Therefore, the framed electrolyte membrane / electrode structure 14 is not accommodated in the recess 72, and the assembly work of the framed electrolyte membrane / electrode structure 14 and the cathode separator 16 cannot be performed. Thereby, it can be detected that the framed electrolyte membrane / electrode structure 14 is in an incorrect posture.

  The framed electrolyte membrane / electrode structure 14 is provided with a notch 62 only on one short side 50 a of the resin frame member 50. Therefore, when the power generation unit 12 is assembled, the posture of the framed electrolyte membrane / electrode structure 14 can be easily and reliably detected by visually observing or touching the notch 62.

  Moreover, the notch 62 can be provided integrally when the resin frame member 50 is molded. Therefore, it is not necessary to newly provide a notch process for the resin frame member 50, and an effect that it is possible to suppress an increase in the number of manufacturing processes of the framed electrolyte membrane / electrode structure 14 can be obtained. .

  Furthermore, one side surface of the cutout portion 62 is configured by a wall surface 58as that linearly extends inward of the resin frame member 50 at an end portion of the first inclined portion 58a on the second inclined portion 58b side. Has been. Thereby, the resin moldability of the notch part 62 improves favorably, and the notch part 62 can be easily integrally molded.

  Further, the closing side end portion 62e of the cutout portion 62 is constituted by a wall surface curved in an arc shape. For this reason, the resin moldability of the notch 62 is improved satisfactorily, and the notch 62 can be reliably molded.

  Therefore, the framed electrolyte membrane / electrode structure 14 and the cathode-side separator 16 can be accurately and reliably positioned with a simple and economical configuration, and misassembly can be suppressed as much as possible. . For this reason, the manufacturing operation of the fuel cell 10 is efficiently performed.

  The operation of the fuel cell 10 configured as described above will be described below.

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 22a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 24a. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the pair of cooling medium inlet communication holes 26a.

  The oxidant gas is introduced into the oxidant gas flow path 28 of the cathode side separator 16 from the oxidant gas inlet communication hole 22a. The oxidant gas moves in the direction of arrow B (horizontal direction) along the oxidant gas flow path 28 and is supplied to the cathode electrode 54 of the electrolyte membrane / electrode structure 48.

  On the other hand, the fuel gas is introduced into the fuel gas passage 36 of the anode separator 18 from the fuel gas inlet communication hole 24a. The fuel gas moves in the horizontal direction (arrow B direction) along the fuel gas flow path 36 and is supplied to the anode electrode 56 of the electrolyte membrane / electrode structure 48.

  Therefore, in the electrolyte membrane / electrode structure 48, the oxidant gas supplied to the cathode electrode 54 and the fuel gas supplied to the anode electrode 56 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Is called.

  Next, the oxidant gas supplied and consumed to the cathode electrode 54 of the electrolyte membrane / electrode structure 48 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 22b. The fuel gas supplied to and consumed by the anode electrode 56 of the electrolyte membrane / electrode structure 48 is discharged in the direction of arrow A along the fuel gas outlet communication hole 24b.

  On the other hand, the cooling medium supplied to the pair of upper and lower cooling medium inlet communication holes 26 a is formed between the cathode side separator 16 constituting one power generation unit 12 and the anode side separator 18 constituting the other power generation unit 12. The cooling medium flow path 34 is introduced.

  The cooling medium supplied to the cooling medium flow path 34 from each cooling medium inlet communication hole 26a once flows in the direction of the arrow C (gravity direction) and then moves in the direction of the arrow B (horizontal direction) to move the electrolyte. The membrane / electrode structure 48 is cooled. This cooling medium moves outward in the direction of arrow C, and is then discharged to the pair of cooling medium outlet communication holes 26b.

  As shown in FIG. 6, the fuel cell 80 according to the second embodiment of the present invention includes a power generation unit 82. The plurality of power generation units 82 are stacked on each other along the horizontal direction (arrow A direction) or the vertical direction (arrow C direction), and are mounted on, for example, a fuel cell electric vehicle (not shown). The same components as those of the fuel cell 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The power generation unit 82 stacks the cathode separator 16, the framed electrolyte membrane / electrode structure 14, and the anode separator 84. The anode-side separator 84 is provided with a protrusion 86 disposed in the notch 62 so as to protrude from the separator surface in the thickness direction. The protrusion 86 is integrally formed with the second seal member 46, but may be formed separately and joined to the anode-side separator 84. Note that the protrusion 86 can be provided by press-molding the metal plate itself constituting the anode-side separator 84.

  In the second embodiment configured as described above, the protrusion 86 provided on the anode separator 84 is disposed in the notch 62 provided in the resin frame member 50. Thus, the framed electrolyte membrane / electrode structure 14 and the anode separator 84 are positioned in a desired posture with respect to each other.

  On the other hand, when the framed electrolyte membrane / electrode structure 14 is overlaid on the anode side separator 84 in a posture rotated 180 degrees from a desired posture, the protrusion 86 of the anode side separator 84 is in contact with the other side of the resin frame member 50. It contacts the short side 50b. For this reason, the assembly work of the electrolyte membrane / electrode structure 14 with a frame and the anode separator 84 cannot be performed.

  Therefore, it is not necessary to provide a new notch process for the resin frame member 50, and the increase in the number of manufacturing processes of the framed electrolyte membrane / electrode structure 14 can be suppressed. The same effect as that of the first embodiment can be obtained.

  In the first and second embodiments, the MEA with a frame is sandwiched between a pair of separators, but the present invention is not limited to this. For example, a power generation unit in which a first separator, a first framed MEA, a second separator, a second framed MEA, and a third separator may be used. In this power generation unit, no cooling medium flow path is provided inside, and the cooling medium flow path is provided between power generation units adjacent to each other (so-called thinning cooling structure).

DESCRIPTION OF SYMBOLS 10,80 ... Fuel cell 12, 82 ... Power generation unit 14 ... Electrolyte membrane electrode assembly with a frame 16 ... Cathode side separator 18, 84 ... Anode side separator 22a ... Oxidant gas inlet communication hole 22b ... Oxidant gas outlet communication hole 24a ... Fuel gas inlet communication hole 24b ... Fuel gas outlet communication hole 26a ... Cooling medium inlet communication hole 26b ... Cooling medium outlet communication hole 28 ... Oxidant gas flow path 34 ... Cooling medium flow path 36 ... Fuel gas flow paths 44, 46 ... Seal member 48 ... Electrolyte membrane / electrode structure 50 ... Resin frame member 50a, 50b ... Short side 52 ... Solid polymer electrolyte membrane 54 ... Cathode electrode 56 ... Anode electrode 58a, 58b, 60a, 60b ... Inclined portion 58as ... Wall surface 62 ... Notch 62e ... Closure side end 64 ... Welding site 70 ... Jig 72 ... Concave 72wt ... Convex 74 ... Positioning part 86 ... Protrusion

Claims (4)

An electrolyte membrane / electrode with a frame having an electrolyte membrane / electrode structure in which electrodes are respectively disposed on both sides of the solid polymer electrolyte membrane, and a resin frame member is provided around the outer periphery of the electrolyte membrane / electrode structure A fuel cell in which a structure and a separator are stacked,
The framed electrolyte membrane / electrode structure has a rectangular shape,
The fuel cell according to claim 1, wherein a cutout portion is formed in an outer periphery of one short side of the resin frame member so as to penetrate in a thickness direction. 2. The fuel cell according to claim 1, wherein a first inclined portion and a second inclined portion that are inclined with respect to each other are provided on the one short side,
A wall surface extending linearly toward the inside of the resin frame member is formed at an end of the first inclined portion on the second inclined portion side, and the wall surface is one side surface of the notch portion. A fuel cell comprising:   3. The fuel cell according to claim 1, wherein a closed side end portion of the notch portion is configured by a wall surface curved in an arc shape. 4.   The fuel cell according to any one of claims 1 to 3, wherein the separator is provided with a protruding portion disposed in the cutout portion so as to protrude in a thickness direction from the separator surface. battery.

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