JP6092053B2 - Electrolyte membrane / electrode structure with resin frame for fuel cells - Google Patents

Description

  The present invention relates to an electrolyte membrane with a resin frame for a fuel cell, comprising: a step MEA in which a solid polymer electrolyte membrane is sandwiched between a first electrode and a second electrode; and a resin frame member provided around the outer periphery of the step MEA. The present invention relates to an electrode structure.

  In general, a polymer electrolyte fuel cell employs a polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell comprises an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode each comprising a catalyst layer (electrode catalyst layer) and a gas diffusion layer (porous carbon) are disposed on both sides of a solid polymer electrolyte membrane ( MEA). The electrolyte membrane / electrode structure is sandwiched between separators (bipolar plates) to constitute a fuel cell. This fuel cell is used as, for example, an in-vehicle fuel cell stack by stacking a predetermined number of fuel cells to form a fuel cell stack.

  In the electrolyte membrane / electrode structure, one gas diffusion layer is set to a plane size smaller than that of the solid polymer electrolyte membrane, and the other gas diffusion layer is set to the same plane size as the solid polymer electrolyte membrane. In other words, a so-called step MEA may be formed. At that time, in order to reduce the amount of the relatively expensive solid polymer electrolyte membrane used and to protect the solid polymer electrolyte membrane having a thin film shape and low strength, an MEA with a resin frame incorporating a resin frame member is adopted. Has been.

  As this type of MEA with a resin frame, for example, an electrolyte membrane-electrode assembly disclosed in Patent Document 1 is known. In this electrolyte membrane-electrode assembly, as shown in FIG. 8, the membrane 1, the anode catalyst layer 2a arranged on one side of the membrane 1, and the cathode catalyst arranged on the other side of the membrane 1 Layer 3a. Both surfaces of the film 1 are provided with GDL (gas diffusion layer) 2b and GDL 3b, and the anode side GDL 2b side area (plane dimension) is larger than the cathode side GDL 3b area (plane dimension). ).

  In the edge region of the MEA, a gasket structure 4 in which a cathode layer and an anode side gasket layer arranged at least in a part around the ends of the anode catalyst layer 2a and the cathode catalyst layer 3a are integrated is arranged. Yes. At least the outer peripheral portion of the film 1 on the side having a small GDL area (GDL 3 b side) and the gasket structure 4 are bonded via an adhesive layer 5.

JP 2007-66766 A

  By the way, the adhesive layer 5 is usually formed by applying an adhesive to the inner peripheral surface 4a of the gasket structure 4 from a dispenser (not shown). At that time, the gasket structure 4 has a frame shape (frame shape), and the speed of the dispenser moving along the inner peripheral surface 4a becomes slow in the vicinity of each corner. Therefore, at each corner, there is a problem that the application amount of the adhesive tends to increase as compared with other parts, for example, straight parts, and the adhesive protrudes from the desired part.

  The present invention solves this type of problem. With a simple configuration, the resin frame member is firmly joined around the outer periphery of the solid polymer electrolyte membrane constituting the step MEA, and the adhesive An object of the present invention is to provide an electrolyte membrane / electrode structure with a resin frame for a fuel cell capable of suppressing protrusion as much as possible.

  In the electrolyte membrane / electrode structure with a resin frame for a fuel cell according to the present invention, a first electrode having a first catalyst layer and a first diffusion layer is provided on one surface of the solid polymer electrolyte membrane. A second electrode having a second catalyst layer and a second diffusion layer is provided on the other surface of the solid polymer electrolyte membrane. The planar dimension of the first electrode is set to be larger than the planar dimension of the second electrode, thereby forming a step-shaped electrolyte membrane / electrode structure. A resin frame member is provided around the outer periphery of the solid polymer electrolyte membrane.

In this electrolyte membrane / electrode structure with a resin frame for a fuel cell, the inner bulging portion that bulges to the second electrode side of the resin frame member circulates around the contact portion with the electrolyte membrane / electrode structure, and is an adhesive. Has a circumferential recess. The circumferential concave portion is provided on the inner peripheral end side of the inner bulging portion, and is provided on the inner peripheral convex portion contacting the second catalyst layer, and on the outer peripheral end side of the inner bulging portion, and on the solid polymer electrolyte membrane. It is formed between the outer peripheral convex part which contacts . The circumferential recess has a corner that curves in an arc.

  Here, the adhesive width, which is the separation distance between the inner peripheral convex portion and the outer peripheral convex portion, is set such that the adhesive width at the corner portion of the circumferential concave portion is larger than the adhesive width at the other portion.

  Further, in the electrolyte membrane / electrode structure with a resin frame for a fuel cell, the second catalyst layer is set to have a larger planar dimension than the second diffusion layer. The separation interval between the outer peripheral end portion of the second catalyst layer and the outer peripheral end portion of the second diffusion layer is such that the separation interval at the corners of the second catalyst layer and the second diffusion layer is larger than the separation interval at the other portions. It is preferable to set a large dimension.

  Furthermore, in this electrolyte membrane / electrode structure with a resin frame for a fuel cell, the corner portion of the second catalyst layer preferably overlaps with the corner portion of the inner circumferential convex portion corresponding to the corner portion of the circumferential concave portion.

  According to the present invention, the circumferential recess provided with the adhesive is set such that the adhesive width at the corner is larger than the adhesive width at the other part. For this reason, in the corner | angular part in which a lot of adhesives are easy to apply | coat compared with another part, the capacity | capacitance is increased rather than the said other part, and an adhesive agent can be accommodated reliably.

  As a result, with a simple configuration, the resin frame member can be firmly joined by circling the outer periphery of the solid polymer electrolyte membrane constituting the step MEA, and the protrusion of the adhesive can be suppressed as much as possible. Become.

It is a principal part disassembled perspective explanatory view of the polymer electrolyte fuel cell in which the electrolyte membrane / electrode structure with a resin frame according to the embodiment of the present invention is incorporated. FIG. 2 is a sectional view of the fuel cell taken along line II-II in FIG. 1. It is front explanatory drawing by the side of the cathode electrode of the said electrolyte membrane-electrode structure with a resin frame. FIG. 3 is a partially exploded perspective view of the resin frame-attached electrolyte membrane / electrode structure. It is a schematic explanatory drawing of the corner | angular part of the said electrolyte membrane and electrode structure with a resin frame. It is explanatory drawing of the method to manufacture the said electrolyte membrane-electrode structure with a resin frame. It is explanatory drawing of the method to manufacture the said electrolyte membrane-electrode structure with a resin frame. 6 is an explanatory diagram of an electrolyte membrane-electrode assembly disclosed in Patent Document 1. FIG.

  As shown in FIGS. 1 and 2, an electrolyte membrane / electrode structure 10 with a resin frame according to an embodiment of the present invention is incorporated in a horizontally long (or vertically long) rectangular polymer electrolyte fuel cell 12. The plurality of fuel cells 12 are stacked in, for example, an arrow A direction (horizontal direction) or an arrow C direction (gravity direction) to form a fuel cell stack. The fuel cell stack is mounted on, for example, a fuel cell electric vehicle (not shown) as an in-vehicle fuel cell stack.

  In the fuel cell 12, the electrolyte membrane / electrode structure 10 with a resin frame is sandwiched between the first separator 14 and the second separator 16. The first separator 14 and the second separator 16 have a horizontally long (or vertically long) rectangular shape. The first separator 14 and the second separator 16 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plating-treated steel plate, a metal plate whose surface is subjected to anticorrosion treatment, a carbon member, or the like.

  The electrolyte membrane / electrode structure 10 with a rectangular resin frame includes an electrolyte membrane / electrode structure 10a as shown in FIGS. The electrolyte membrane / electrode structure 10a includes, for example, a solid polymer electrolyte membrane 18 in which a perfluorosulfonic acid thin film is impregnated with water, an anode electrode (first electrode) 20 sandwiching the solid polymer electrolyte membrane 18, and And a cathode electrode (second electrode) 22.

  The solid polymer electrolyte membrane 18 may use an HC (hydrocarbon) based electrolyte in addition to the fluorine based electrolyte. The cathode electrode 22 has a smaller planar dimension than the solid polymer electrolyte membrane 18 and the anode electrode 20.

  Instead of the above configuration, the anode electrode 20 may be configured to have a smaller planar dimension than the solid polymer electrolyte membrane 18 and the cathode electrode 22. At that time, the anode electrode 20 is a second electrode, and the cathode electrode 22 is a first electrode.

  The anode electrode 20 includes a first electrode catalyst layer (first catalyst layer) 20a joined to one surface 18a of the solid polymer electrolyte membrane 18, and a first gas diffusion layer laminated on the first electrode catalyst layer 20a. (First diffusion layer) 20b. The first electrode catalyst layer 20a and the first gas diffusion layer 20b have the same external dimensions and are set to the same external dimensions as (or less than) the solid polymer electrolyte membrane 18.

  The cathode electrode 22 includes a second electrode catalyst layer (second catalyst layer) 22a joined to the surface 18b of the solid polymer electrolyte membrane 18, and a second gas diffusion layer (first electrode) laminated on the second electrode catalyst layer 22a. 2 diffusion layer) 22b. The outer peripheral end 22ae of the second electrode catalyst layer 22a protrudes outward from the outer peripheral end 22be of the second gas diffusion layer 22b, and the second electrode catalyst layer 22a has an outer shape of the solid polymer electrolyte membrane 18. The outer dimension is set smaller than the dimension.

  As shown in FIGS. 3 and 4, corners 22a (cor.) Projecting outward are provided at the four corners of the second electrode catalyst layer 22a. The spacing between the outer peripheral end 22ae of the second electrode catalyst layer 22a and the outer peripheral end 22be of the second gas diffusion layer 22b is the spacing between the corners of the second electrode catalyst layer 22a and the second gas diffusion layer 22b. L1 is set to a size larger than the separation interval L2 in the other part (L1> L2). The corner portion 22a (cor.) Is set to have a larger curvature than the curvature at the time of bending while maintaining the separation interval L2, and the corner of the inner circumferential convex portion 26b1 corresponding to the corner portion of the circumferential concave portion 26a of the resin frame member 24 described later. Overlapping parts.

  In the first electrode catalyst layer 20a and the second electrode catalyst layer 22a, porous carbon particles having a platinum alloy supported thereon are uniformly applied to the surfaces of the first gas diffusion layer 20b and the second gas diffusion layer 22b. It is formed. The first gas diffusion layer 20b and the second gas diffusion layer 22b are made of carbon paper or the like, and the planar dimension of the second gas diffusion layer 22b is set smaller than the planar dimension of the first gas diffusion layer 20b. . The first electrode catalyst layer 20a and the second electrode catalyst layer 22a are formed on both surfaces of the solid polymer electrolyte membrane 18, for example.

  As shown in FIGS. 1 to 3, the electrolyte membrane / electrode structure 10 with a resin frame circulates around the outer periphery of the solid polymer electrolyte membrane 18 and is joined to the anode electrode 20 and the cathode electrode 22. Is provided. The resin frame member 24 includes, for example, PPS (polyphenylene sulfide), PPA (polyphthalamide), PEN (polyethylene naphthalate), PES (polyethersulfone), LCP (liquid crystal polymer), PVDF (polyvinylidene fluoride), It is composed of silicone rubber, fluorine rubber, EPDM (ethylene propylene rubber) or the like.

  The resin frame member 24 and the first gas diffusion layer 20b of the anode electrode 20 are integrated by a resin impregnated portion 24t. As will be described later, the resin impregnated portion 24t is configured by a resin protrusion 24ta formed integrally with the resin frame member 24.

  A thin-walled inner bulging portion 24 a that protrudes to the outer peripheral side of the cathode electrode 22 is integrally provided on the inner wall portion 24 b of the resin frame member 24. The inner bulging portion 24a has the same thickness as the cathode electrode 22, substantially the same thickness as the second gas diffusion layer 22b (when an intermediate layer is provided on the second gas diffusion layer 22b). (Including the thickness of the intermediate layer).

  The inner bulging portion 24a has a circumferential recess 26a in which an adhesive 25 is provided around the contact portion with the electrolyte membrane / electrode structure 10a. The circumferential recess 26a is formed between an inner peripheral convex portion 26b1 provided on the inner peripheral end side of the inner bulged portion 24a and an outer peripheral convex portion 26b2 provided on the outer peripheral end side of the inner bulged portion 24a.

  The adhesive 25 is not applied to the inner peripheral convex portion 26b1 and the outer peripheral convex portion 26b2. The outer peripheral end 22ae of the second electrode catalyst layer 22a is disposed so as to protrude into the circumferential recess 26a. The outer peripheral convex portion 26b2 is configured to be thicker than the inner peripheral convex portion 26b1 by the thickness of the second electrode catalyst layer 22a.

  The inner circumferential convex portion 26b1 contacts the second electrode catalyst layer 22a protruding outward from the second gas diffusion layer 22b of the electrolyte membrane / electrode structure 10a. The outer peripheral convex part 26b2 is in contact with the outermost peripheral part of the solid polymer electrolyte membrane 18 constituting the electrolyte membrane / electrode structure 10a.

  As shown in FIG. 5, a curved corner portion 26b2 (cor.) Is provided at each corner portion of the outer peripheral convex portion 26b2. In the conventional configuration in which the outer peripheral convex portion 26b2 is provided with the curved corner portion 26b2 (ref.) While maintaining the adhesive width L3 that is the separation distance between the inner peripheral convex portion 26b1 and the outer peripheral convex portion 26b2, the curved corner portion 26b2 (ref. .) Is smaller than the curvature of the curved corner of the inner peripheral convex portion 26b1. The curvature k2 of the curved corner portion 26b2 (cor.) Is set substantially equal to the curvature of the curved corner portion of the inner peripheral convex portion 26b1.

  As a result, there is a relationship of k1 <k2, and the space portion 28 is provided between the curved corner portion 26b2 (cor.) And the curved corner portion of the inner peripheral convex portion 26b1. The adhesive width, which is the distance between the inner peripheral convex portion 26b1 and the outer peripheral convex portion 26b2, is such that the adhesive width L4 in the curved corner portion 26b2 (cor.) Of the peripheral concave portion 26a is larger than the adhesive width L3 in other portions. (L3 <L4).

  The inner bulging portion 24a of the resin frame member 24 and the electrolyte membrane / electrode structure 10a are bonded together by a layer of adhesive 25 applied to the circumferential recess 26a. The layer of the adhesive 25 is formed in a frame shape over the entire circumference of the outer peripheral edge portion 18be of the solid polymer electrolyte membrane 18. As the adhesive 25, for example, a liquid seal or a hot melt agent is used. As shown in FIG. 2, a gap is formed between the inner peripheral end 24ae of the resin frame member 24 and the outer peripheral end 22be of the second gas diffusion layer 22b. A layer of adhesive 25 is formed in the gap.

  As shown in FIG. 1, one end edge of the fuel cell 12 in the direction of arrow B (horizontal direction in FIG. 1) communicates with each other in the direction of arrow A, which is the stacking direction. A cooling medium inlet communication hole 32a and a fuel gas outlet communication hole 34b are provided. The oxidant gas inlet communication hole 30a supplies an oxidant gas, for example, an oxygen-containing gas, while the cooling medium inlet communication hole 32a supplies a cooling medium. The fuel gas outlet communication hole 34b discharges fuel gas, for example, hydrogen-containing gas. The oxidant gas inlet communication hole 30a, the cooling medium inlet communication hole 32a, and the fuel gas outlet communication hole 34b are arranged in the direction of arrow C (vertical direction).

  The other end edge of the fuel cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, the fuel gas inlet communication hole 34a for supplying fuel gas, the cooling medium outlet communication hole 32b for discharging the cooling medium, and the oxidation An oxidant gas outlet communication hole 30b for discharging the oxidant gas is provided. The fuel gas inlet communication hole 34a, the cooling medium outlet communication hole 32b, and the oxidant gas outlet communication hole 30b are arranged in the direction of arrow C.

  An oxidant gas flow path 36 communicating with the oxidant gas inlet communication hole 30a and the oxidant gas outlet communication hole 30b is provided on the surface 16a of the second separator 16 facing the electrolyte membrane / electrode structure 10 with a resin frame. .

  A fuel gas flow path 38 communicating with the fuel gas inlet communication hole 34a and the fuel gas outlet communication hole 34b is formed on the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 10 with a resin frame. A cooling medium flow path 40 communicating with the cooling medium inlet communication hole 32a and the cooling medium outlet communication hole 32b is formed between the surface 14b of the first separator 14 and the surface 16b of the second separator 16 adjacent to each other. .

  As shown in FIGS. 1 and 2, the first seal member 42 is integrated with the surfaces 14 a and 14 b of the first separator 14 around the outer peripheral end of the first separator 14. The second seal member 44 is integrated with the surfaces 16 a and 16 b of the second separator 16 around the outer peripheral end portion of the second separator 16.

  As shown in FIG. 2, the first seal member 42 includes a first convex seal 42 a that contacts the resin frame member 24 constituting the electrolyte membrane / electrode structure 10 with a resin frame, and a second seal of the second separator 16. And a second convex seal 42b in contact with the member 44. The second seal member 44 constitutes a flat seal in which the surface that contacts the second convex seal 42b extends in a flat shape along the separator surface. Instead of the second convex seal 42b, the second seal member 44 may be provided with a convex seal (not shown).

  For the first seal member 42 and the second seal member 44, for example, EPDM, NBR, fluororubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material Alternatively, an elastic seal member such as a packing material is used.

  Next, a method for producing the resin frame-attached electrolyte membrane / electrode structure 10 will be described below.

  First, as shown in FIG. 6, an electrolyte membrane / electrode structure 10a that is a step MEA is manufactured, while the resin frame member 24 is molded by injection molding using a mold (not shown). Is done. The resin frame member 24 has a thin inner bulging portion 24a. On the surface opposite to the inner bulging portion 24a, a resin protruding portion 24ta for projecting in the thickness direction to form the resin-impregnated portion 24t is formed integrally around the frame.

  Next, the adhesive 25 is applied to the circumferential recess 26a of the resin frame member 24 through, for example, a dispenser (not shown). On the other hand, an adhesive 25 is applied to the inner peripheral surface of the inner peripheral end 24 ae of the resin frame member 24. Then, the inner wall portion 24b of the resin frame member 24 and the outer peripheral end portion 20be of the first gas diffusion layer 20b of the electrolyte membrane / electrode structure 10a are aligned, the adhesive 25 is heated, and the load (press or the like) ) Is given.

  Thereby, the inner bulging portion 24a of the resin frame member 24 and the outer peripheral edge portion 18be of the solid polymer electrolyte membrane 18 are bonded to each other through the adhesive 25 layer. Further, the inner peripheral surface of the inner peripheral end 24 ae of the resin frame member 24 and the distal end surface of the outer peripheral end 22 be of the second gas diffusion layer 22 b are bonded via an adhesive 25 layer.

  Further, as shown in FIG. 7, while the electrolyte membrane / electrode structure 10a and the resin frame member 24 are aligned, a load is applied and the resin protrusion 24ta of the resin frame member 24 is heated. The As the heating method, laser welding, infrared welding, impulse welding, or the like is employed.

  Accordingly, the resin protrusion 24ta is heated and melted, and the resin protrusion 24ta is impregnated in the first gas diffusion layer 20b constituting the anode electrode 20. Thereby, the electrolyte membrane and electrode structure 10 with a resin frame is manufactured.

  As shown in FIG. 2, the resin membrane-attached electrolyte membrane / electrode structure 10 is sandwiched between the first separator 14 and the second separator 16. The second separator 16 contacts the inner peripheral end 24 ae of the resin frame member 24 and applies a load to the electrolyte membrane / electrode structure 10 with a resin frame together with the first separator 14. Furthermore, a predetermined number of fuel cells 12 are stacked to form a fuel cell stack, and a clamping load is applied between end plates (not shown).

  The operation of the fuel cell 12 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 30a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 34a. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 32a.

  For this reason, the oxidant gas is introduced into the oxidant gas flow path 36 of the second separator 16 from the oxidant gas inlet communication hole 30a and moves in the direction of arrow B to the cathode electrode 22 of the electrolyte membrane / electrode structure 10a. Supplied. On the other hand, the fuel gas is introduced into the fuel gas flow path 38 of the first separator 14 from the fuel gas inlet communication hole 34a. The fuel gas moves in the direction of arrow B along the fuel gas flow path 38 and is supplied to the anode electrode 20 of the electrolyte membrane / electrode structure 10a.

  Therefore, in each electrolyte membrane / electrode structure 10a, the oxidant gas supplied to the cathode electrode 22 and the fuel gas supplied to the anode electrode 20 are in the second electrode catalyst layer 22a and the first electrode catalyst layer 20a. In this way, it is consumed by an electrochemical reaction to generate electricity.

  Next, the oxidant gas consumed by being supplied to the cathode electrode 22 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 30b. Similarly, the fuel gas consumed by being supplied to the anode electrode 20 is discharged in the direction of arrow A along the fuel gas outlet communication hole 34b.

  The cooling medium supplied to the cooling medium inlet communication hole 32a is introduced into the cooling medium flow path 40 between the first separator 14 and the second separator 16, and then flows in the direction of arrow B. The cooling medium is discharged from the cooling medium outlet communication hole 32b after the electrolyte membrane / electrode structure 10a is cooled.

  In this case, in this embodiment, as shown in FIGS. 4 and 5, the adhesive width, which is the separation distance between the inner circumferential convex portion 26 b 1 and the outer circumferential convex portion 26 b 2, is at the curved corner portion 26 b 2 (cor.) Of the circumferential concave portion 26 a. The adhesive width L4 is set to a size larger than the adhesive width L3 in other portions. Therefore, the curved corner portion 26b2 (cor.) Protrudes outward from the conventional curved corner portion 26b2 (ref.), And the space portion 28 is formed outward of the curved corner portion 26b2 (ref.). Provided (see FIG. 5).

  Here, when the adhesive 25 is applied from the moving dispenser to the circumferential recess 26a, particularly in each curved corner portion 26b2 (cor.) Where the speed of the dispenser is reduced, a larger amount of the adhesive than in other portions. 25 is easy to apply. At this time, in the present embodiment, the capacity of the curved corner portion 26b2 (cor.) Is increased by the space portion 28 as compared with the capacity of other portions. Therefore, the adhesive 25 applied to the curved corner portion 26b2 (cor.) Can be reliably accommodated.

  Accordingly, the resin frame member 24 can be firmly joined around the outer periphery of the solid polymer electrolyte membrane 18 constituting the step MEA with a simple configuration, and the protrusion of the adhesive 25 can be suppressed as much as possible. The effect that it becomes possible is obtained.

  Moreover, corners 22a (cor.) Projecting outward are provided at the four corners of the second electrode catalyst layer 22a of the cathode electrode 22, respectively. Specifically, the separation interval L1 at the corners of the second electrode catalyst layer 22a and the second gas diffusion layer 22b is set to be larger than the separation interval L2 at the other portions (L1> L2).

  For this reason, when positioning the electrolyte membrane / electrode structure 10a and the resin frame member 24, even if a relative positional shift occurs, the corner 22a (cor.) And the corner of the inner peripheral convex portion 26b1 of the resin frame member 24 are formed. The portion can be reliably overlapped. Therefore, leakage of the oxidant gas and the like can be reliably suppressed.

  In the present embodiment, the resin-impregnated portion 24t is constituted by the resin protrusion 24ta that is integrally formed with the resin frame member 24. However, the present invention is not limited to this. For example, a resin member separate from the resin frame member 24 is prepared, and the resin member is melted across the resin frame member 24 and the first gas diffusion layer 20b to form the resin impregnated portion 24t. Also good.

DESCRIPTION OF SYMBOLS 10 ... Electrolyte membrane / electrode structure with resin frame 10a ... Electrolyte membrane / electrode structure 12 ... Fuel cell 14, 16 ... Separator 18 ... Solid polymer electrolyte membrane 20 ... Anode electrode 20a, 22a ... Electrode catalyst layer 20b, 22b ... Gas diffusion layer 22 ... Cathode electrode 22a (cor.) ... Corner 24 ... Resin frame member 24a ... Inner bulge 24b ... Inner side wall 24t ... Resin impregnated portion 24ta ... Resin protrusion 25 ... Adhesive 26a ... Circumferential recess 26b1 ... inner peripheral convex part 26b2 ... outer peripheral convex part 26b2 (cor.) ... curved corner part 30a ... oxidant gas inlet communication hole 30b ... oxidant gas outlet communication hole 32a ... cooling medium inlet communication hole 32b ... cooling medium outlet communication hole 34a ... fuel Gas inlet communication hole 34b ... Fuel gas outlet communication hole 36 ... Oxidant gas flow path 38 ... Fuel gas flow path 40 ... Cooling medium flow path 42, 44 ... Sealing member

Claims (3)

A first electrode having a first catalyst layer and a first diffusion layer is provided on one surface of the solid polymer electrolyte membrane, and a second catalyst layer and a second electrode are provided on the other surface of the solid polymer electrolyte membrane. A stepped electrolyte membrane / electrode structure in which a second electrode having a diffusion layer is provided, and a planar dimension of the first electrode is set to be larger than a planar dimension of the second electrode;
A resin frame member provided around the outer periphery of the solid polymer electrolyte membrane;
An electrolyte membrane / electrode structure with a resin frame for a fuel cell comprising:
The inner bulge portion that bulges to the second electrode side of the resin frame member has a circumferential recess in which an adhesive is provided by circling a contact portion with the electrolyte membrane / electrode structure,
The circumferential concave portion is provided on the inner peripheral end side of the inner bulge portion and is provided on the outer peripheral end side of the inner bulge portion and the inner peripheral convex portion that contacts the second catalyst layer, and the solid polymer electrolyte membrane Is formed between the outer peripheral convex part abutting to the
The circumferential recess has a corner that curves in an arc,
Adhesive width that is a distance between the outer convex portion and the inner peripheral protrusions, said adhesive width in the corner portions of the circumferential recess is set to a larger dimension than the adhesive width in the other parts An electrolyte membrane / electrode structure with a resin frame for a fuel cell. The electrolyte membrane / electrode structure with a resin frame for a fuel cell according to claim 1, wherein the second catalyst layer is set to have a larger planar dimension than the second diffusion layer,
The separation interval between the outer peripheral end portion of the second catalyst layer and the outer peripheral end portion of the second diffusion layer is such that the separation interval at the corners of the second catalyst layer and the second diffusion layer is the separation interval at the other portion. An electrolyte membrane / electrode structure with a resin frame for a fuel cell, characterized in that the size is set to a larger dimension.   The electrolyte membrane / electrode structure with a resin frame for a fuel cell according to claim 1 or 2, wherein a corner portion of the second catalyst layer overlaps a corner portion of the inner circumferential convex portion corresponding to a corner portion of the circumferential concave portion. An electrolyte membrane / electrode structure with a resin frame for a fuel cell.

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