JP2016091936A - Method for manufacturing resin frame-attached electrolyte membrane-electrode structure for fuel battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method by which an electrolyte membrane-electrode structure and a resin frame member can be firmly joined together well with simple steps.SOLUTION: In a resin frame-attached electrolyte membrane-electrode structure 10, an electrolyte membrane-electrode structure 10a and a resin frame member 24 are integrated together. A method for manufacturing the resin frame-attached electrolyte membrane-electrode structure according to the present invention comprises the steps of: providing a first film member 28 on the electrolyte membrane-electrode structure 10a; providing a second film member 30 on the resin frame member 24; and combining, by welding, the first film member 28 and the second film member 30 into one.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electrolyte membrane / electrode structure with a resin frame for a fuel cell, comprising: an MEA having a solid polymer electrolyte membrane sandwiched between a pair of electrodes; and a resin frame member provided on the MEA around the outer periphery of the MEA. It relates to the manufacturing method.

  In general, a polymer electrolyte fuel cell employs a polymer electrolyte membrane made of a polymer ion exchange membrane. The fuel cell includes an electrolyte membrane / electrode structure (MEA) in which an anode electrode is disposed on one of the solid polymer electrolyte membranes and a cathode electrode is disposed on the other of the solid polymer electrolyte membranes. The anode electrode and the cathode electrode each have a catalyst layer (electrode catalyst layer) and a gas diffusion layer (porous carbon).

  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.

  In the electrolyte membrane / electrode structure, a resin frame member is incorporated in order to reduce the amount of a relatively expensive solid polymer electrolyte membrane used and to protect the solid polymer electrolyte membrane having a thin film shape and low strength. A framed MEA is employed.

  As an 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. 13, an anode catalyst layer 2a and an anode gas diffusion layer 2b having the same outer dimensions as the membrane 1 are arranged on one surface of the membrane 1. Yes. On the other surface of the membrane 1, a cathode catalyst layer 3a and a cathode gas diffusion layer 3b having outer dimensions smaller than those of the membrane 1 are disposed. Thus, the step MEA 4 is configured.

  The anode gas diffusion layer 2 b is set to have a larger area than the cathode gas diffusion layer 3 b, and the outer peripheral portion of the film 1 on the cathode gas diffusion layer 3 b side and the gasket structure 5 are joined via an adhesion site 6. Has been.

JP 2007-66766 A

  By the way, in the above-mentioned Patent Document 1, the outer peripheral edge (plane) of the membrane 1 on the cathode gas diffusion layer 3b side and the plane of the inner peripheral thin portion 5a of the gasket structure 5 are connected via the bonding portion 6 having a frame shape. Are joined.

  However, in the bonding step between the step MEA 4 and the gasket structure 5, if the adhesive is excessively applied to the bonding site 6 or the bonding load varies, the adhesive may protrude from the bonding site 6.

  Moreover, when the anode gas diffusion layer 2b and the cathode gas diffusion layer 3b are subjected to a heating step such as resin impregnation after bonding, there is a problem that the molten resin leaks out from the bonding portion 6 and the adhesive melts. Further, in the heating process, the adhesive at the bonding site 6 may be melted by heat transfer.

  The present invention solves this type of problem, and can provide an electrolyte membrane with a fuel frame for a fuel cell capable of firmly and satisfactorily joining an electrolyte membrane / electrode structure and a resin frame member with a simple process. -It aims at providing the manufacturing method of an electrode structure.

  An electrolyte membrane / electrode structure with a resin frame for a fuel cell to which the production method according to the present invention is applied includes an electrolyte membrane / electrode structure in which electrodes are provided on both sides of the solid polymer electrolyte membrane, and the solid polymer electrolyte membrane. And a resin frame member provided on the electrolyte membrane / electrode structure.

  This manufacturing method includes a step of providing a first film member at a resin frame joining portion of an electrolyte membrane / electrode structure, and a step of providing a second film member at an MEA joining portion of the resin frame member. The manufacturing method further includes a step of integrally welding the first film member and the second film member.

  Moreover, it is preferable that this manufacturing method has the process of covering the joining site | part of a 1st film member and a 2nd film member, and welding a 3rd film member integrally.

  Furthermore, in this manufacturing method, the third film member is preferably provided integrally with the first film member or the second film member.

  Furthermore, in this manufacturing method, the electrolyte membrane / electrode structure is preferably a step MEA in which the planar dimension of one electrode is set to be larger than the planar dimension of the other electrode.

  According to the present invention, the first film member provided at the resin frame joint portion of the electrolyte membrane / electrode structure and the second film member provided at the MEA joint portion of the resin frame member are integrally welded. Yes. For this reason, it is only necessary to weld the first film member and the second film member to each other to join the electrolyte membrane / electrode structure and the resin frame member, and the work can be simplified more easily than an adhesive or the like. . Therefore, it is possible to join the electrolyte membrane / electrode structure and the resin frame member firmly and satisfactorily by a simple process.

It is a principal part disassembled perspective explanatory view of a polymer electrolyte fuel cell in which an electrolyte membrane / electrode structure with a resin frame manufactured by the manufacturing method according to the first 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 principal part cross-sectional explanatory drawing of the said electrolyte membrane and electrode structure with a resin frame. It is a partial cross section perspective explanatory drawing of the resin frame member which comprises the said electrolyte membrane with a resin frame and electrode structure. 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. It is explanatory drawing of the method to manufacture the said electrolyte membrane-electrode structure with a resin frame. It is principal part cross-sectional explanatory drawing of the electrolyte membrane and electrode structure with a resin frame manufactured by the manufacturing method which concerns on the 2nd Embodiment of this invention. It is principal part cross-sectional explanatory drawing of the electrolyte membrane and electrode structure with a resin frame manufactured by the manufacturing method which concerns on the 3rd Embodiment of this invention. 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. 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, the electrolyte membrane / electrode structure 10 with a resin frame manufactured by the manufacturing method according to the first embodiment of the present invention has a horizontally long (or vertically long) rectangular shape, It is incorporated in the 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.

  As shown in FIGS. 1 to 3, the resin membrane-attached electrolyte membrane / electrode structure 10 includes an electrolyte membrane / electrode structure 10 a that is a step MEA. The electrolyte membrane / electrode structure 10a includes, for example, a solid polymer electrolyte membrane (cation exchange membrane) 18 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode electrode 20 sandwiching the solid polymer electrolyte membrane 18. And a cathode 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 (outer 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. Further, instead of the step MEA, the solid polymer electrolyte membrane 18, the anode electrode 20, and the cathode electrode 22 may all be set to the same planar dimension.

  The anode electrode 20 includes a first electrode catalyst layer 20a joined to one surface 18a of the solid polymer electrolyte membrane 18, and a first gas diffusion layer 20b laminated on the first electrode catalyst layer 20a. The first electrode catalyst layer 20a and the first gas diffusion layer 20b have the same planar dimensions and are set to the same (or less than) the same planar dimensions as the solid polymer electrolyte membrane 18. A thin-walled recess 20br is formed around the outer peripheral edge of the first gas diffusion layer 20b in a frame shape.

  The cathode electrode 22 includes a second electrode catalyst layer 22a bonded to the surface 18b of the solid polymer electrolyte membrane 18, and a second gas diffusion layer 22b stacked on the second electrode catalyst layer 22a. The second electrode catalyst layer 22 a and the second gas diffusion layer 22 b have the same planar dimension and are set to a planar dimension smaller than the planar dimension of the solid polymer electrolyte membrane 18. The second electrode catalyst layer 22a and the second gas diffusion layer 22b may be set to different plane dimensions.

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

  The resin membrane-attached electrolyte membrane / electrode structure 10 includes a resin frame member 24 that 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. 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), m-PPE (modified polyphenylene ether resin), or the like. The resin frame member 24 is further made of PET (polyethylene terephthalate), PBT (polybutylene terephthalate), modified polyolefin, or the like.

  As shown in FIGS. 1-4, the resin frame member 24 has the frame-shaped thick part 24a. As shown in FIGS. 2 to 4, the resin frame member 24 has an inner bulging portion 24 b formed in a thin shape that bulges toward the cathode electrode 22 via an inner peripheral base end portion 24 s on the inner circumference of the thick portion 24 a. Have The inner bulging portion 24b extends inward from the inner peripheral base end portion 24s with a predetermined length, and is an outer peripheral edge portion of the solid polymer electrolyte membrane 18 (a film exposed outward from the outer periphery of the cathode electrode 22). (Part) It is arranged covering 18be.

  A thin-walled concave portion 24r is formed on the inner peripheral portion of the thick portion 24a so as to be continuous with the inner peripheral base end portion 24s so as to have a frame shape. The concave portion 24r of the thick portion 24a and the concave portion 20br of the first gas diffusion layer 20b have the same depth d and communicate with each other to form a frame-shaped concave portion having a predetermined width dimension S1 as a whole (FIG. 3). reference).

  As shown in FIGS. 2 and 3, the outer peripheral part of the electrolyte membrane / electrode structure 10 a and the inner peripheral part of the resin frame member 24 are joined by a film joining part 26. The film joining portion 26 includes a first resin film member 28 provided on the electrolyte membrane / electrode structure 10 a, a second resin film member 30 provided on the resin frame member 24, and a third resin film film 32.

  The first film member 28 has an inner end portion 28 a bonded to the outer peripheral portion of the electrolyte membrane / electrode structure 10 a, that is, the tip of the cathode electrode 22. The first film member 28 has a flat portion 28 b that is bent by 90 ° from the inner end portion 28 a and joined to the outer peripheral edge portion 18 be of the solid polymer electrolyte membrane 18. The first film member 28 is bent by 90 ° from the flat portion 28 b and has an outer end portion 28 c joined to the tips of the solid polymer electrolyte membrane 18 and the anode electrode 20. The inner end portion 28a, the flat portion 28b, and the outer end portion 28c are integrally formed and have a substantially Z-shaped cross section.

  The second film member 30 includes a flat portion 30a joined to the inner bulging portion 24b of the resin frame member 24, and an outer end portion 30b bent by 90 ° from the flat portion 30a and joined to the inner peripheral base end portion 24s. Have The third film member 32 is integrally formed with the second film member 30, and has a flat portion 32a disposed in the recess 20br and a flat portion 32b disposed in the recess 24r.

  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 36a and a fuel gas outlet communication hole 38b are provided. The oxidant gas inlet communication hole 34a supplies an oxidant gas, for example, an oxygen-containing gas, while the cooling medium inlet communication hole 36a supplies a cooling medium. The fuel gas outlet communication hole 38b discharges fuel gas, for example, hydrogen-containing gas. The oxidant gas inlet communication hole 34a, the cooling medium inlet communication hole 36a, and the fuel gas outlet communication hole 38b are arranged in an arrow C direction (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 38a for supplying fuel gas, the cooling medium outlet communication hole 36b for discharging the cooling medium, and the oxidation An oxidant gas outlet communication hole 34b for discharging the oxidant gas is provided. The fuel gas inlet communication hole 38a, the coolant outlet communication hole 36b, and the oxidant gas outlet communication hole 34b are arranged in the direction of arrow C.

  An oxidant gas flow path 40 communicating with the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b is provided on the surface 16a of the second separator 16 facing the electrolyte membrane / electrode structure 10 with a resin frame. . The oxidant gas flow path 40 circulates the oxidant gas in the arrow B direction.

  A fuel gas passage 42 communicating with the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b is formed on the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 10 with a resin frame. The fuel gas channel 42 circulates the fuel gas in the direction of arrow B. A cooling medium flow path 44 communicating with the cooling medium inlet communication hole 36a and the cooling medium outlet communication hole 36b is formed between the surface 14b of the first separator 14 and the surface 16b of the second separator 16 adjacent to each other. . The cooling medium flow path 44 causes the cooling medium to flow in the direction of arrow B.

  As shown in FIGS. 1 and 2, the first seal member 46 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 48 is integrated with the surfaces 16 a and 16 b of the second separator 16 around the outer peripheral end of the second separator 16.

  As shown in FIG. 2, the first seal member 46 includes a first convex seal 46 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 46b in contact with the member 48. The second seal member 48 constitutes a flat seal in which the surface that contacts the second convex seal 46b extends in a flat shape along the separator surface. Note that a convex seal (not shown) may be provided on the second seal member 48 instead of the second convex seal 46b.

  For the first seal member 46 and the second seal member 48, 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, an elastic seal member such as a packing material is used.

  Next, a first manufacturing method for manufacturing the electrolyte membrane / electrode structure 10 with a resin frame will be described below.

  First, the electrolyte membrane / electrode structure 10a that is the step MEA is manufactured, while the resin frame member 24 is injection-molded using a mold (not shown). As shown in FIG. 4, the resin frame member 24 integrally includes a thick portion 24a and a thin inner bulge portion 24b. A concave portion 24r is provided on the inner peripheral portion of the thick portion 24a. In the electrolyte membrane / electrode structure 10a, a recess 20br communicating with the recess 24r is formed at the outer peripheral edge of the first gas diffusion layer 20b.

  Next, as shown in FIG. 5, the first film member 28 is bonded and integrated, for example, at the resin frame bonding portion of the electrolyte membrane / electrode structure 10 a. The first film member 28 has a substantially Z-shaped cross section, and the inner end portion 28a, the flat portion 28b, and the outer end portion 28c are the tip of the cathode electrode 22, the outer peripheral edge portion 18be of the solid polymer electrolyte membrane 18, and It is bonded to the tips of the solid polymer electrolyte membrane 18 and the anode electrode 20.

  On the other hand, the second film member 30 is, for example, welded and integrated with the MEA joint portion of the resin frame member 24. The second film member 30 is provided with the third film member 32 integrally and has a substantially L-shaped cross section. The flat portion 30a and the outer end portion 30b of the second film member 30 are welded to the inner bulging portion 24b and the inner peripheral base end portion 24s of the resin frame member 24. The third film member 32 extends in a straight line along the outer end 30b with the flat portions 32a and 32b overlapping each other. Specifically, the third film member 32 is provided with flat portions 32a and 32b by forming a cut 32k over a predetermined length.

  Then, the outer peripheral part of the electrolyte membrane / electrode structure 10a and the inner peripheral part of the resin frame member 24 are aligned. Specifically, as shown in FIG. 6, the flat portion 30 a of the second film member 30 is superimposed on the flat portion 28 b of the first film member 28, and the inner end portion 28 a of the first film member 28 is flat. It abuts on the end face of the portion 30a. Further, the outer end portion 28 c of the first film member 28 contacts the inner surface of the outer end portion 30 b of the second film member 30. In this state, the first film member 28 and the second film member 30 are integrated by welding.

  Next, as shown in FIG. 7, in the third film member 32, the flat portions 32a and 32b are bent in a direction away from each other by being separated along the cut line 32k. The flat portion 32a is disposed in the concave portion 20br of the first gas diffusion layer 20b, while the flat portion 32b is disposed in the concave portion 24r of the resin frame member 24. The flat portions 32a and 32b are integrally welded so as to cover the joint portion of the first film member 28 and the second film member 30. In addition, it is preferable that the thickness of the flat parts 32a and 32b is set to the same dimension as the depth of the recessed parts 20br and 24r.

  Therefore, the resin frame member 24 and the electrolyte membrane / electrode structure 10a are integrally joined by the film joining portion 26, and the electrolyte membrane / 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 abuts on the inner bulging portion 24 b 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 34a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 38a. Supplied. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 36a.

  For this reason, the oxidant gas is introduced into the oxidant gas flow path 40 of the second separator 16 from the oxidant gas inlet communication hole 34a, 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 42 of the first separator 14 from the fuel gas inlet communication hole 38a. The fuel gas moves in the direction of arrow B along the fuel gas flow path 42 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. Then, 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 34b. 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 38b.

  The cooling medium supplied to the cooling medium inlet communication hole 36 a is introduced into the cooling medium flow path 44 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 36b after the electrolyte membrane / electrode structure 10a is cooled.

  In this case, in the first embodiment, as shown in FIGS. 2 and 3, the first film member 28 provided on the electrolyte membrane / electrode structure 10 a and the second film member provided on the resin frame member 24. 30 are welded together.

  For this reason, the joining of the electrolyte membrane / electrode structure 10a and the resin frame member 24 is only to weld the first film member 28 and the second film member 30 to each other. Easy to plan. Therefore, the electrolyte membrane / electrode structure 10a and the resin frame member 24 can be firmly and satisfactorily joined in a simple process, and the electrolyte membrane / electrode structure 10 with a resin frame can be efficiently manufactured. The effect of being able to be obtained.

  FIG. 8 is an explanatory cross-sectional view of a main part of an electrolyte membrane / electrode structure 50 with a resin frame manufactured by the manufacturing method according to the second embodiment of the present invention. The same components as those in the resin frame-attached electrolyte membrane / electrode structure 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The resin membrane-attached electrolyte membrane / electrode structure 50 includes a film bonding portion 52, and the film bonding portion 52 includes a second film member 54 instead of the second film member 30. The second film member 54 includes two films 54 a and 54 b, the films 54 a and 54 b are joined to a predetermined length, and a portion separated from each other is configured as the third film member 32. The electrolyte membrane / electrode structure 50 with a resin frame is manufactured in the same manner as in the first manufacturing method.

  In the second embodiment configured as described above, the first film member 28 provided on the electrolyte membrane / electrode structure 10a and the second film member 54 provided on the resin frame member 24 are integrally welded. Has been. Moreover, the second film member 54 is provided with the third film member 32 by separating the front end side. Therefore, the same effects as those of the first embodiment can be obtained, for example, the resin membrane-attached electrolyte membrane / electrode structure 50 can be efficiently manufactured.

  FIG. 9 is an explanatory cross-sectional view of a main part of an electrolyte membrane / electrode structure 60 with a resin frame manufactured by the manufacturing method according to the third embodiment of the present invention.

  The resin membrane-attached electrolyte membrane / electrode structure 60 includes a film bonding portion 62, and the film bonding portion 62 has a first film member 28, a second film member 64, and a third film member 66, respectively. The second film member 64 has a substantially L-shaped cross section, and the third film member 66 has a frame shape having an I-shaped cross section.

  Next, a third manufacturing method for manufacturing the electrolyte membrane / electrode structure 60 with a resin frame will be described below.

  As shown in FIG. 10, the 1st film member 28 is adhere | attached on the resin frame joining site | part of the electrolyte membrane and electrode structure 10a, for example. On the other hand, the second film member 64 is welded to the MEA joint portion of the resin frame member 24, for example.

  And as shown in FIG. 11, while the 2nd film member 64 is piled up on the 1st film member 28, the said 1st film member 28 and the said 2nd film member 64 are integrated by welding. .

  Next, the third film member 66 is integrally disposed in the recess 20br of the first gas diffusion layer 20b and the recess 24r of the resin frame member 24. As shown in FIG. 12, the third film member 66 is integrally welded so as to cover the joint portion of the first film member 28 and the second film member 64. Therefore, the resin frame member 24 and the electrolyte membrane / electrode structure 10a are integrally joined by the film joining portion 62, and the electrolyte membrane / electrode structure 60 with a resin frame is manufactured.

  Thereby, in 3rd Embodiment, the effect similar to said 1st and 2nd embodiment is acquired.

  In the first to third embodiments, the fuel cell 12 is configured by sandwiching one MEA with a pair of separators, but is not limited thereto. For example, it has a power generation unit in which a first separator, a first MEA, a second separator, a second MEA, and a third separator are stacked in this order, and a cooling medium flow path is formed between the power generation units. A fuel cell may be employed.

DESCRIPTION OF SYMBOLS 10, 50, 60 ... Electrolyte membrane / electrode structure 10a with resin frame ... 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 20br, 24r ... Recess 22 ... Cathode electrode 24 ... Resin frame member 24a ... Thick part 24b ... Inner bulging part 24s ... Inner peripheral base end part 26, 52, 62 ... Film joint part 28, 30, 32, 54, 64, 66 ... film member 34a ... oxidant gas inlet communication hole 34b ... oxidant gas outlet communication hole 36a ... cooling medium inlet communication hole 36b ... cooling medium outlet communication hole 38a ... fuel gas inlet communication hole 38b ... fuel Gas outlet communication hole 40 ... Oxidant gas passage 42 ... Fuel gas passage 44 ... Cooling medium passage 46, 48 ... Seal members 54a, 54b ... Film

Claims (4)

An electrolyte membrane / electrode structure in which electrodes are provided on both sides of the solid polymer electrolyte membrane;
A resin frame member provided around the electrolyte membrane / electrode structure around the outer periphery of the solid polymer electrolyte membrane;
A method for producing an electrolyte membrane / electrode structure with a resin frame for a fuel cell, comprising:
Providing a first film member at a resin frame joining portion of the electrolyte membrane / electrode structure;
Providing a second film member at the MEA bonding site of the resin frame member;
A step of integrally welding the first film member and the second film member;
A method for producing an electrolyte membrane / electrode structure with a resin frame for a fuel cell, comprising:   2. The manufacturing method according to claim 1, further comprising a step of integrally welding a third film member so as to cover a joint portion between the first film member and the second film member. Manufacturing method of membrane / electrode structure.   3. The manufacturing method according to claim 2, wherein the third film member is provided integrally with the first film member or the second film member. Production method.   In the manufacturing method according to any one of claims 1 to 3, in the electrolyte membrane / electrode structure, a planar dimension of one of the electrodes is set to a dimension larger than a planar dimension of the other electrode. A method for producing an electrolyte membrane / electrode structure with a resin frame for a fuel cell, which is a step MEA.

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