JP6618762B2 - Electrolyte membrane / electrode structure with resin frame for fuel cell and production method thereof - Google Patents

Description

  The present invention provides an electrolyte membrane with a resin frame for a fuel cell, comprising: a step MEA sandwiching a solid polymer electrolyte membrane between a first electrode and a second electrode having different planar dimensions; and a resin frame member that goes around the outer periphery of the step MEA. -It is related with an electrode structure and its 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 surface of a solid polymer electrolyte membrane and a cathode electrode is disposed on the other surface of the solid polymer electrolyte membrane. Yes. 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 form a power generation cell (unit fuel cell). The power generation cells are used as, for example, an in-vehicle fuel cell stack by stacking a predetermined number of power generation cells.

  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 use of a relatively expensive solid polymer electrolyte membrane 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 on the outer periphery Is adopted.

  As an MEA with a resin frame, for example, an electrolyte membrane / electrode structure for a fuel cell and a method for producing the same disclosed in Patent Document 1 are known. In this electrolyte membrane / electrode structure, a resin frame member is provided around the outer periphery of the solid polymer electrolyte membrane, and the resin frame member and at least the outer peripheral edge of the first electrode or the second electrode It has an impregnation part which joins any one of an outer peripheral part integrally.

International Publication No. 2012/137609 Pamphlet

  By the way, when the resin frame member is melted to provide the impregnation portion, high temperature heat is input to the resin frame member. For this reason, the resin frame member is likely to be deformed or melted by heat, and there is a risk that irregularities are formed on the surface. At this time, the seal member of the separator may come into contact with the outer peripheral edge of the resin frame member. Therefore, if there are irregularities on the surface of the resin frame member, there is a problem that a clearance is caused on the contact surface (seal surface) between the resin frame member and the seal member, and leakage of the reaction gas and the cooling medium occurs. .

  The present invention solves this type of problem, and when the resin melting portion is provided, the outer peripheral surface of the resin frame member is not affected by heat, and a good sealing surface is formed on the resin frame member. It is an object of the present invention to provide an electrolyte membrane / electrode structure with a resin frame for a fuel cell and a method for producing the same.

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

Then, the resin frame member, together with part of the resin melt portion having a resin-impregnated part immersed including within the first gas diffusion layer is provided, in the outermost periphery of the resin frame member, the resin melting portion A thin-walled portion thinner than the resin melt portion is provided in the thickness direction through a step portion on the outermost periphery of the resin frame, and the resin melt portion is located on one surface side of the resin frame member. A first portion adjacent to the outer peripheral side with respect to the first portion, and a second portion adjacent to the other surface side of the resin frame member with respect to the first portion. On the other hand, adjacent to the outer peripheral side, the first portion protrudes in the thickness direction by the height of the stepped portion with respect to the thin portion, and the first gas diffusion layer passes through an inclined surface. It has an inclined thin portion that is inclined toward the resin impregnated portion and is formed in a thin shape.
Moreover, it is preferable that the said resin frame member has the extension part extended to the position corresponding to the said inclination thin part from the said resin fusion | melting part while contacting the other surface of the said solid polymer electrolyte membrane.

Further, in the method for manufacturing an electrolyte membrane / electrode structure with a resin frame for a fuel cell according to the present invention, a protrusion is provided which is located outward from the outer periphery of the first gas diffusion layer and protrudes in the thickness direction. A resin frame member is produced. Further, after the step MEA is arranged on the inner peripheral side of the resin frame member, there is a melting step of melting the protrusion by the heating surface of the movable mold. Accordingly, a resin-impregnated part partially impregnated inside the first gas diffusion layer, and a first part located on one surface side of the resin frame member and adjacent to the outer peripheral side with respect to the resin-impregnated part And a resin melt part having a second part adjacent to the other surface side of the resin frame member with respect to the first part, and an outermost periphery of the resin melt part at an outermost periphery of the resin frame member In addition, a thin part thinner than the resin melt part is provided in the thickness direction through the step part. In the melting step, the first portion is provided to protrude in the thickness direction by the height of the stepped portion with respect to the thin portion, and is inclined toward the resin-impregnated portion through an inclined surface. In addition, an inclined thin part formed in a thin shape is formed in the first gas diffusion layer.

Furthermore, in this manufacturing method, the resin frame member is located outward from the protrusion, the bank portion is provided to be embedded in thin and resin melting portion in the thickness direction than the protrusion portion, the bank parts are Rukoto protrude in the protruding direction of the protruding portion than the outermost periphery of the resin frame member is preferred.

  According to the present invention, the outermost periphery of the resin frame member is provided with a thin portion thinner than the resin melted portion in the thickness direction via the stepped portion on the outermost periphery of the resin melted portion. For this reason, when the resin melted portion is formed, heat due to heat input is hardly transmitted to the outermost periphery of the resin frame member, and it is possible to prevent deformation or melting due to the heat. Therefore, when the resin melted portion is provided, the outer peripheral surface of the resin frame member is not affected by heat, and a good seal surface can be secured on the resin frame member.

It is a principal part disassembled perspective explanatory view of a polymer electrolyte power generation cell in which an electrolyte membrane / electrode structure with a resin frame according to an embodiment of the present invention is incorporated. It is II-II sectional view explanatory drawing in FIG. 1 of the said electric power generation cell. 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 joining apparatus which fuse | melts a resin projection part and forms a resin fusion | melting part. It is operation | movement explanatory drawing by the said joining apparatus.

  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 into a horizontally long (or vertically long) rectangular solid polymer power generation cell 12. The plurality of power generation 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.

  The power generation cell 12 sandwiches the electrolyte membrane / electrode structure 10 with a resin frame 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 a step MEA 10a as shown in FIGS. The step MEA 10a includes, for example, a solid polymer electrolyte membrane (cation exchange membrane) 18 that is a thin film of perfluorosulfonic acid containing moisture. The solid polymer electrolyte membrane 18 is sandwiched between an anode electrode (first electrode) 20 and a cathode electrode (second electrode) 22. The solid polymer electrolyte membrane 18 can use an HC (hydrocarbon) electrolyte in addition to the fluorine 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. At that time, the anode electrode 20 becomes the second electrode, and the cathode electrode 22 becomes the first electrode.

  As shown in FIGS. 2 and 3, the anode electrode 20 includes a first electrode catalyst layer 20a bonded to one surface 18a of the solid polymer electrolyte membrane 18, and a first electrode catalyst layer 20a laminated on the first electrode catalyst layer 20a. 1 gas diffusion layer 20b is provided. 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.

  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 22a protrudes outward from the outer peripheral end face 22be of the second gas diffusion layer 22b, has a larger planar dimension than the second gas diffusion layer 22b, and is larger than the solid polymer electrolyte membrane 18. Set to small planar dimensions.

  The second electrode catalyst layer 22a and the second gas diffusion layer 22b may be set to the same plane dimension, and the second electrode catalyst layer 22a is smaller in plane dimension than the second gas diffusion layer 22b. You may have.

  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 together with an ion conductive polymer binder. The second electrode catalyst layer 22a is formed, for example, by applying porous carbon particles having a platinum alloy supported on the surface thereof to the surface of the second gas diffusion layer 22b together with an ion conductive polymer binder.

  The first gas diffusion layer 20b and the second gas diffusion layer 22b are formed of carbon paper, carbon cloth, or the like. 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 20 a and the second electrode catalyst layer 22 a are formed on both surfaces of the solid polymer electrolyte membrane 18.

  The electrolyte membrane / electrode structure 10 with a resin frame includes a resin frame member (including a resin film) 24 that circulates around the outer periphery of the solid polymer electrolyte membrane 18 and is bonded 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), Silicone resin, fluororesin, m-PPE (modified polyphenylene ether resin), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), modified polyolefin, or the like.

  The resin frame member 24 has a frame shape and, as shown in FIG. 3, a thin portion 24a having a thickness t1 extending inward from the outer peripheral end portion over a predetermined length. The resin frame member 24 is provided with an inner bulging portion 24b formed in a thin shape that bulges toward the cathode electrode 22 through the inner step 24s. The inner bulging portion 24b has an inner peripheral end surface 24be provided with an R (curved surface) at the inner corner.

  As shown in FIG. 3, a frame-shaped resin melted portion 26 is formed on the surface of the thin-walled portion 24a connected to the outer peripheral seal surface 24f by melting the resin protrusion 24t, as will be described later. The resin melting part 26 has a frame-shaped resin impregnated part 26a partially impregnated in the outer peripheral edge part of the first gas diffusion layer 20b constituting the anode electrode 20, and the resin melting part 26 is formed from the outermost periphery. A flat surface having no step is formed across the resin-impregnated portion 26a. The resin frame member 24 is located outside the resin projection 24t, is thinner in the thickness direction than the resin projection 24t, and is embedded in the resin melting portion 26 by melting the resin projection 24t. A frame-shaped bank portion 24d is provided. On the outermost periphery of the resin frame member 24, a thin-walled portion 24a thinner than the resin melted portion 26 in the thickness direction is provided on the outermost periphery of the resin melted portion 26 via a step portion 26s.

  The thin portion 24a has a thickness t1, while the resin melted portion 26 has a thickness t2 from the outer peripheral seal surface 24f, which is the surface of the thin portion 24a, and is set to a thickness t3 as a whole. The surface of the resin melted portion 26 is formed thin from the surface of the first gas diffusion layer 20b by a thickness t4. The first gas diffusion layer 20b is inclined inward toward the resin-impregnated portion 26a via the inclined surface 20br and is formed in a thin shape.

  The distance S1 from the melting starting point P of the resin protrusion 24t to the inner peripheral end of the resin melting part 26 (resin impregnating part 26a), the distance S2 from the melting starting point P to the thin-walled starting point of the first gas diffusion layer 20b, and the above A distance S3 from the melting starting point P to the inner step 24s is set. Specifically, the relationship of distance S1 <distance S2 <distance S3 is set.

  As shown in FIGS. 2 and 3, a filling chamber 27 is provided between the inner bulging portion 24 b and the step MEA 10 a, and an adhesive layer 28 is formed in the filling chamber 27. For example, a liquid seal or a hot melt agent is provided on the adhesive layer 28 as an adhesive. In addition, as an adhesive agent, it is not restrict | limited to liquid, solid, thermoplasticity, thermosetting, etc.

  As shown in FIG. 1, one end edge of the power generation cell 12 in the direction of arrow B (horizontal direction) communicates with each other in the direction of arrow A, which is the stacking direction. A 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 power generation 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. . The oxidant gas flow channel 36 has a plurality of linear flow channel grooves (or wavy flow channel grooves) extending in the arrow B direction.

  A fuel gas flow path 38 communicating with the fuel gas inlet communication hole 34a and the fuel gas outlet communication hole 34b is provided on the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 10 with a resin frame. The fuel gas flow path 38 has a plurality of straight flow path grooves (or wavy flow path grooves) extending in the direction of arrow B.

  Between the surface 14b of the first separator 14 and the surface 16b of the second separator 16 adjacent to each other, a cooling medium flow path 40 communicating with the cooling medium inlet communication hole 32a and the cooling medium outlet communication hole 32b is indicated by an arrow B. It is formed extending in the direction.

  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 has a first convex seal 42 a that abuts on the outer peripheral seal surface 24 f of the resin frame member 24 constituting the electrolyte membrane / electrode structure 10 with resin frame. The first seal member 42 has a second convex seal 42 b that contacts the second seal member 44 of the second separator 16. The second seal member 44 constitutes a flat seal portion 44f whose surface abutting on the second convex seal 42b extends with a uniform thickness 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), while the first seal member 42 may be configured with a flat seal portion.

  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 manufacturing method of the resin membrane-attached electrolyte membrane / electrode structure 10 according to the present embodiment will be described below.

  First, the step MEA 10a 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 is provided with a thin portion 24a having a thickness t1 at the outer peripheral end portion, and an inner portion 24g inside the thin portion 24a is set to a thickness t5. Note that the thickness t1 and the thickness t5 may be the same dimension or different dimensions. A resin projecting portion 24t and a bank portion 24d are provided integrally with the inner portion 24g so as to protrude in the thickness direction. The resin protrusion 24t and the bank 24d have a frame shape. A thin-walled inner bulging portion 24b is integrally formed at the inner peripheral end of the inner portion 24g via an inner step 24s.

  Therefore, an adhesive is applied onto the outer peripheral surface portion 18be of the solid polymer electrolyte membrane 18 through, for example, a dispenser (not shown). The joint portion between the outer peripheral surface portion 18be of the solid polymer electrolyte membrane 18 and the inner bulging portion 24b of the resin frame member 24 is heated and pressurized in a state where an adhesive is applied. For this reason, an adhesive agent hardens | cures and the adhesive bond layer 28 is obtained.

  Next, as shown in FIG. 5, the resin protrusion 24 t is melted by the joining device 50 to form the resin melted portion 26. The joining device 50 includes a base (mold) 52 on which the resin frame member 24 is placed and a movable mold 54 that can be moved forward and backward with respect to the base 52. The movable mold 54 has a frame shape, and the width dimension H1 between the inner end part 54in and the outer end part 54out is slightly larger than the width dimension H2 of the resin melting part 26 (see FIG. 6).

  On the base 52, the resin frame member 24 fixed by the adhesive layer 28 and the step MEA 10a are placed. In the resin frame member 24, the resin protrusion 24t is arranged upward, that is, toward the movable mold 54 side. Then, the movable mold 54 is lowered while being heated to a predetermined temperature, thereby heating and pressurizing the resin protrusion 24t.

  For this reason, the resin protrusion 24t of the resin frame member 24 is heated and pressurized by the movable mold 54 and melted. The resin protrusion 24t is melted so as to spread in the width direction (arrow C direction) along the heating surface of the movable mold 54. A part of the molten resin that flows inward is impregnated in the outer peripheral edge of the first gas diffusion layer 20b, while it flows outward and passes over the bank portion 24d to reach the end of the thin portion 24a.

  As shown in FIG. 6, the movable mold 54 is stopped at a position separated from the outer peripheral seal surface 24f of the resin frame member 24 by a distance corresponding to the thickness t2. Accordingly, the resin protrusion 24t is melted to form the resin melted portion 26. At that time, the resin-impregnated portion 26a impregnated in the first gas diffusion layer 20b is formed, and the outer peripheral edge portion of the first gas diffusion layer 20b is compressed to the thickness of the resin-impregnated portion 26a. Thereby, the step MEA 10a and the resin frame member 24 are joined together, and these are integrally taken out from the joining device 50, whereby the electrolyte membrane / electrode structure 10 with a resin frame is obtained (see FIG. 3).

  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 in the stacking direction to the electrolyte membrane / electrode structure 10 with a resin frame together with the first separator 14. Furthermore, a predetermined number of power generation cells 12 are stacked to form a fuel cell stack, and a tightening load is applied between end plates (not shown).

  The operation of the power generation 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. Supplied. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 32a.

  Therefore, 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, moves in the direction of arrow B, and is supplied to the cathode electrode 22 of the step MEA 10a. 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 step MEA 10a.

  Therefore, in the step MEA 10a, the oxidant gas supplied to the cathode electrode 22 and the fuel gas supplied to the anode electrode 20 are consumed by the electrochemical reaction in the second electrode catalyst layer 22a and the first electrode catalyst layer 20a. Then, power generation is performed.

  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 cooling the step MEA 10a.

  In this case, in this embodiment, as shown in FIGS. 2 and 3, the resin melting member is formed on the outermost periphery of the resin frame member 24 in the thickness direction via a step portion 26 s on the outermost periphery of the resin melting portion 26. A thin portion 24 a thinner than 26 is provided. For this reason, as shown in FIGS. 5 and 6, when the resin protrusion 24 t is melted by the joining device 50 to form the resin melted portion 26, heat due to heat input is hardly transmitted to the outermost periphery of the resin frame member 24. Become.

  Therefore, it is possible to prevent the thin portion 24a of the resin frame member 24 from being deformed or melted by heat input. Thereby, when the resin melted portion 26 is provided, the outer peripheral surface of the resin frame member 24, particularly the outer peripheral seal surface 24f of the thin portion 24a is not affected by heat, and a good sealing surface is formed on the resin frame member 24. The effect that it becomes possible to ensure is obtained.

  Further, in the present embodiment, as shown in FIGS. 3 and 5, the resin frame member 24 is positioned outward from the resin protrusion 24t, is thinner in the thickness direction than the resin protrusion 24t, and A bank portion 24d embedded in the resin melting portion 26 is provided by melting the resin protrusion 24t. For this reason, when the resin protrusion 24t is melted by the movable mold 54 and the molten resin flows to the outer peripheral side (the outer peripheral seal surface 24f side) of the resin frame member 24, the bank portion 24d becomes an obstacle (resistance) of the molten resin. Function as.

  Accordingly, the molten resin does not flow more than necessary on the outer peripheral side of the resin frame member 24, and the smooth outer peripheral seal surface 24f having a desired width dimension can be reliably maintained. As a result, the outer peripheral seal surface 24f can be more reliably suppressed from being deformed or uneven.

10 ... Electrolyte membrane / electrode structure with resin frame 10a ... Step MEA
DESCRIPTION OF SYMBOLS 12 ... Power generation cell 14, 16 ... Separator 18 ... Solid polymer electrolyte membrane 18be ... Outer peripheral surface part 20 ... Anode electrode 20a, 22a ... Electrode catalyst layer 20b, 22b ... Gas diffusion layer 22 ... Cathode electrode 22be ... Outer peripheral end surface 24 ... Resin frame Member 24a ... Thin-walled portion 24b ... Inner bulging portion 24be ... Inner peripheral end surface 24d ... Bank portion 24s ... Inner step 24t ... Resin protrusion 26 ... Resin melted portion 26a ... Resin impregnated portion 28 ... Adhesive layer 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 Channel 40: Cooling medium channels 42, 44 ... Sealing member 50 ... Joining device

Claims (4)

A first electrode having a first electrode catalyst layer and a first gas diffusion layer is provided on one surface of the solid polymer electrolyte membrane, and a second electrode catalyst layer is provided on the other surface of the solid polymer electrolyte membrane. And a second electrode having a second gas diffusion layer, and the planar dimension of the first electrode is a step MEA set to be larger than the 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 resin frame member, together with the resin melting portion is provided with a resin-impregnated part immersed including within a portion said first gas diffusion layer,
On the outermost periphery of the resin frame member, a thin-walled portion thinner than the resin melted portion is provided in the thickness direction via a stepped portion on the outermost periphery of the resin melted portion,
The resin melting part is
A first portion located on one surface side of the resin frame member and adjacent to the outer peripheral side with respect to the resin impregnated portion;
A second part adjacent to the other surface side of the resin frame member with respect to the first part,
The thin portion is adjacent to the outer peripheral side with respect to the second portion,
The first portion protrudes in the thickness direction by the height of the step portion with respect to the thin portion,
The first gas diffusion layer has an inclined thin-walled portion that is inclined toward the resin-impregnated portion through an inclined surface and is formed into a thin-walled shape. body. An electrolyte membrane / electrode structure with a resin frame for a fuel cell according to claim 1,
The resin frame member has an extending part that contacts the other surface of the solid polymer electrolyte membrane and extends from the resin melting part to a position corresponding to the inclined thin part. Electrolyte membrane / electrode structure with resin frame. A first electrode having a first electrode catalyst layer and a first gas diffusion layer is provided on one surface of the solid polymer electrolyte membrane, and a second electrode catalyst layer is provided on the other surface of the solid polymer electrolyte membrane. And a second electrode having a second gas diffusion layer, and the planar dimension of the first electrode is a step MEA set to be larger than the planar dimension of the second electrode;
A resin frame member provided 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:
A step of producing the resin frame member provided with a protrusion that is located outward from the outer periphery of the first gas diffusion layer and protrudes in the thickness direction;
Arranging the step MEA on the inner peripheral side of the resin frame member;
By melting the protrusion by the heating surface of the movable mold, a resin impregnated part partially impregnated inside the first gas diffusion layer and the one side of the resin frame member are positioned on the one side. A resin melt portion having a first portion adjacent to the outer peripheral side with respect to the resin impregnated portion and a second portion adjacent to the other surface side of the resin frame member with respect to the first portion; On the outermost periphery of the frame member, a melting step of providing a thin-walled portion thinner than the resin melted portion in the thickness direction through a stepped portion on the outermost periphery of the resin melted portion,
Have
In the melting step, the first portion is provided to protrude in the thickness direction by the height of the stepped portion with respect to the thin portion, and is inclined toward the resin-impregnated portion through an inclined surface. In addition, a method for producing an electrolyte membrane / electrode structure with a resin frame for a fuel cell, wherein an inclined thin portion formed in a thin shape is formed in the first gas diffusion layer. The manufacturing method according to claim 3, wherein the resin frame member is located on the outer side of the protruding portion, is thinner in the thickness direction than the protruding portion, and is embedded in the resin melting portion. Is provided,
The method for producing an electrolyte membrane / electrode structure with a resin frame for a fuel cell, wherein the bank portion protrudes in a protruding direction of the protruding portion from the outermost periphery of the resin frame member.

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