JP6150060B2 - Membrane electrode assembly with frame, single cell for fuel cell and fuel cell stack - Google Patents

Description

  The present invention relates to a membrane electrode assembly with a frame used in a polymer electrolyte fuel cell, and relates to a single cell for a fuel cell and a fuel cell stack using the membrane electrode assembly with a frame.

  As this type of membrane electrode assembly, there is one described in Patent Document 1 under the name of a method for producing an electrolyte membrane / electrode structure with a resin frame for a fuel cell. In the electrolyte membrane / electrode structure with a resin frame described in Patent Document 1, the electrolyte membrane is exposed on the outer periphery of the electrolyte membrane / electrode structure with the anode electrode removed. Further, on the inner periphery of the resin frame member, there are provided a thin inner protrusion corresponding to the thickness of the anode electrode and a resin protrusion protruding in the thickness direction on the cathode electrode side. Then, the resin frame-attached electrolyte membrane / electrode structure is bonded to the exposed electrolyte membrane with the inner peripheral protrusion of the resin frame member by an adhesive layer, and then the resin protrusion is heated and melted to melt the cathode electrode. The gas diffusion layer is impregnated, and a resin-impregnated portion is formed in the gas diffusion layer.

JP 2013-131417 A

  However, in the conventional membrane electrode assembly with a frame (an electrolyte membrane / electrode structure with a resin frame for a fuel cell) as described above, for example, when a differential pressure is generated between the anode gas and the cathode gas, the frame becomes thick. It may be deformed so as to bend in the vertical direction, and a peeling load may act on the joint between the inner peripheral projection of the frame and the electrolyte membrane. For this reason, in the conventional membrane electrode assembly with a frame, the bonding strength between the frame and the electrolyte membrane may be insufficient, particularly when the electrolyte membrane is made of a difficult-to-adhere material such as a fluorine-based material. There was a problem that there was, and it was a problem to solve such a problem.

  The present invention has been made paying attention to the above-mentioned conventional problems, and even when an electrolyte membrane made of a hardly adhesive material is used, the bonding strength between the frame and the electrolyte membrane of the membrane electrode assembly is increased. An object of the present invention is to provide a membrane electrode assembly with a frame.

A membrane electrode assembly with a frame according to the present invention includes a membrane electrode assembly having a structure in which an electrolyte membrane is sandwiched between a pair of electrode layers, a resin frame having an opening for arranging the membrane electrode assembly, A resin-made auxiliary frame is provided on one side and faces the inner peripheral edge of the opening. The membrane electrode assembly with a frame has an outer peripheral extension portion in which the electrolyte membrane of the membrane electrode assembly extends to the outer peripheral side of the electrode layer, and a through-hole in the thickness direction formed in the outer peripheral extension portion. Then, a bonding layer made of an adhesive or an adhesive is provided between the inner peripheral edge of the frame and the auxiliary frame with an outer peripheral extension having a through hole interposed therebetween, and the bonding layer penetrates from the frame. The structure continues from the hole to the auxiliary frame, and the above structure is used as a means for solving the conventional problems.

  In the membrane electrode assembly with frame according to the present invention, the frame and the auxiliary frame are joined to the outer peripheral extension of the electrolyte membrane by the joining layer. At this time, the joining layer reaches the auxiliary frame from the frame through the through hole. Since it is in a continuous state, a state in which the frame and the auxiliary frame are substantially joined is obtained, and the electrolyte membrane of the membrane electrode assembly is mechanically engaged with the joining layer at the through hole portion. It becomes a state. Thereby, the membrane electrode assembly with a frame can increase the bonding strength between the frame and the electrolyte membrane of the membrane electrode assembly even when an electrolyte membrane made of a hardly adhesive material is used.

FIG. 3 is a perspective view (A) illustrating a fuel cell stack according to the present invention, a perspective view (B) in an exploded state, and a perspective view (C) illustrating a cell module and a seal plate. The exploded perspective view (A) of the fuel cell shown in FIG. 1, the exploded perspective view (B) of the main part of the membrane electrode assembly with a frame upside down with respect to FIG. 2A, and the membrane electrode assembly with a frame It is a perspective view (C). It is sectional drawing (A) of the principal part explaining 1st Embodiment of the membrane electrode assembly with a frame concerning this invention, and the expanded sectional view (B) of the junction part of a flame | frame and a membrane electrode assembly. Sectional drawing (A) of the principal part explaining 2nd Embodiment of the membrane electrode assembly with a frame concerning this invention, the expanded sectional view (B) of the junctional part of a flame | frame and a membrane electrode assembly, and the formation procedure of a joining layer It is sectional drawing (C) explaining these. In 3rd Embodiment of the membrane electrode assembly with a frame concerning this invention, it is an expanded sectional view which shows the junction part of a flame | frame and a membrane electrode assembly. In 4th Embodiment of the membrane electrode assembly with a frame concerning this invention, each top view (A)-(C) of outer periphery extension part of electrolyte membrane which shows arrangement | positioning of a projection part and a through-hole, and 5th Embodiment It is sectional drawing (D) of the outer periphery extension part of the electrolyte membrane which illustrates these.

<First Embodiment>
The fuel cell stack FS shown in FIG. 1 includes at least two or more cell modules M in which a plurality of single cells C are integrated and integrated, as shown in FIGS. And a seal plate P interposed therebetween. The unit cell C and the seal plate P in the illustrated example each have a rectangular plate shape having substantially the same vertical and horizontal dimensions. In FIG. 1C, two cell modules M and one seal plate P are shown, but actually, a larger number of cell modules M and seal plates P are stacked.

  The fuel cell stack FS has end plates 56A and 56B arranged at both ends in the stacking direction of the cell modules M, and fastened to the stacking end surfaces (upper and lower surfaces in FIG. 1) on the long side of the single cell C. The plates 57A and 57B are provided, and the reinforcing plates 58A and 58B are provided on the laminated end surface on the short side. Each of the fastening plates 57A, 57B and the reinforcing plates 58A, 58B has a size over the entire length in the stacking direction of the stacked body A composed of the cell module M and the seal plate P, and is connected to both end plates 56A, 56B by bolts (not shown). .

  In this way, the fuel cell stack FS has a case-integrated structure as shown in FIG. 1A. Each cell module M and the seal plate P are constrained and pressurized in the stacking direction, and each unit cell C is predetermined. In order to maintain good gas sealing performance and electrical conductivity. The single cell C in the illustrated example has an external terminal 59 for voltage measurement at the same position on the long side. On the other hand, one fastening plate 57A on the upper side in FIG. 1 has a slit 57S into which the external terminal 59 of each single cell C enters, and a connector divided into an appropriate number with respect to the external terminal 59. (Not shown) can be connected.

  As shown in FIG. 2, the unit cell C includes a membrane electrode assembly 2 with a frame and a pair of separators 3 and 4 (an anode side and a cathode side) that sandwich the membrane electrode assembly 2. The membrane electrode assembly 2 has a structure in which an electrolyte membrane is sandwiched between a pair of electrode layers, and includes a resin frame 1 and an auxiliary frame 5 around the membrane. The frame 1 and the separators 3 and 4 are all rectangular plate shapes having substantially the same vertical and horizontal dimensions. The joining of the frame 1 and auxiliary frame 5 to the membrane electrode assembly 2 will be described in detail later.

  The membrane electrode assembly 2 is generally called an MEA (Membrane Electrode Assembly), and as shown in part of FIG. 3A, an electrolyte membrane 11 made of a solid polymer is used as a fuel electrode layer (anode). 12 and an air electrode layer (cathode) 13. Although not shown, the fuel electrode layer 11 and the air electrode layer 13 are each provided with a catalyst layer and a gas diffusion layer made of a porous material from the membrane electrode assembly 2 side. In this membrane electrode assembly 2, an anode gas (hydrogen) is supplied to the fuel electrode layer 12, and a cathode gas (air) is supplied to the air electrode layer 13 to generate power by an electrochemical reaction.

  Each of the separators 3 and 4 is a metal plate member having an inverted shape, and is made of stainless steel, for example, and can be formed into an appropriate shape by pressing. In each separator 3, 4, the central region corresponding to the membrane electrode assembly 2 is formed in a wave shape in the cross section in the short side direction. This wave shape is continuous in the long side direction. In each of the separators 3 and 4, on one surface facing the membrane electrode assembly 2, the corrugated crest portion is in contact with the membrane electrode assembly 2, and the corrugated trough portion is a flow path for anode gas or cathode gas.

  The frame 1 of the membrane electrode assembly 2 and the separators 3 and 4 have three manifold holes H1 to H3 and H4 to H6, respectively, at both ends on the short side. The manifold holes H1 to H3 shown on the left side of FIG. 1 are for cathode gas supply (H1), cooling fluid supply (H2) and anode gas discharge (H3), and communicate with each other in the stacking direction. A flow path is formed. 1 are for anode gas supply (H4), cooling fluid discharge (H5), and cathode gas discharge (H6), and communicate with each other in the stacking direction. The flow path is formed. The supply and discharge may be partially or entirely reversed in positional relationship.

  Further, a seal member S is continuously arranged around the peripheral edge of the frame 1 and the separators 3 and 4 and around the manifold holes H1 to H6. These sealing members S also function as adhesives, and airtightly join the frame 1 and membrane electrode assembly 2 to the separators 3 and 4. Further, the seal member S disposed around the manifold holes H1 to H6 has an opening at a corresponding portion in order to supply fluid according to each layer while maintaining the airtightness of each manifold.

  The unit cell C is formed by stacking a predetermined number of cell modules M. At this time, a cooling fluid channel is formed between the adjacent single cells C, and a cooling fluid channel is also formed between the adjacent cell modules M. Therefore, the seal plate P is disposed between the cell modules M, that is, in the flow path of the cooling fluid.

  The seal plate P is formed by molding a single conductive metal plate, is formed in the same rectangular plate shape and in the same size as the above-described single cell C in plan view, and on both short sides, Manifold holes H1 to H6 similar to the single cell C are formed. The seal plate P is provided with a seal member around each of the manifold holes H1 to H6, and an outer peripheral seal member 51 and an inner peripheral seal member 52 are provided in parallel at the peripheral portion of the seal plate P. The member 51 prevents rainwater and the like from entering from the outside, and the inner peripheral sealing member 52 prevents leakage of the cooling fluid flowing through the flow path between the cell modules M.

  As shown in FIG. 2 and FIG. 3A, the membrane electrode assembly 2 with a frame is disposed on one side of the frame 1 and a resin frame 1 having an opening 1A in which the membrane electrode assembly 2 is disposed. And an auxiliary frame 5 made of resin facing the inner peripheral edge 1C of the opening 1A. The frame 1 and the auxiliary frame 5 are more preferably formed of the same resin material, but different resin materials may be used.

  The frame 1 of this embodiment includes an opening 1A in which the membrane electrode assembly 2 is disposed, and a step 1B formed along the periphery of the opening 1A and corresponding to the thickness of the frame 1. As shown in FIG. 3A, the inner peripheral edge 1C extends into the opening 1A in a state of being biased to one side (upper side in FIG. 3) of the frame 1 by the step 1B. Thereby, as for the frame 1, the thickness of the main-body part and the inner periphery part 1C is substantially equal, and it is thick in the level | step-difference part 1B.

  The auxiliary frame 5 has a rectangular frame shape corresponding to the inner peripheral edge 1C of the frame 1, and is disposed on the surface opposite to the bias side (the lower surface in FIG. 3) of the inner peripheral edge 1C of the frame 1. is there. The auxiliary frame 5 may be an integrally molded product as shown in the drawing, or may be a combination of a plurality of components.

  With respect to these frames 1 and 5, the membrane electrode assembly 2 is such that the electrolyte membrane 11 extends to the outer peripheral side of the electrode layers 12 and 13 at the outer peripheral edge as shown in FIG. 2 (B) and FIG. In this state, the extending portion is defined as an outer peripheral extending portion 11A, and a through hole 11B in the thickness direction is formed in the outer peripheral extending portion 11A. The outer peripheral extension portion 11 </ b> A is formed over the entire outer peripheral portion of the membrane electrode assembly 2. The through holes 11B are plural and are arranged at predetermined intervals in the outer peripheral extension portion 11A.

  And the membrane electrode assembly 2 is a state in which an outer peripheral extension portion 11A having a through hole 11B is interposed between the inner peripheral edge portion 1C of the frame 1 and the auxiliary frame 5 as shown in FIG. 3B. Thus, the bonding layer 14 made of an adhesive or a pressure-sensitive adhesive is provided. At this time, the outer peripheral extension portion 11 </ b> A of the electrolyte membrane 11 of the membrane electrode assembly 2 is embedded in the bonding layer 14. Further, in the membrane electrode assembly 2 with the frame, the inner peripheral edge 1C of the frame 1 is biased toward the fuel electrode layer 12 side.

  In FIG. 2, the frame-like bonding layer 14 is shown, but the actual bonding layer 14 is provided by screen printing or coating. In FIG. 3A, there is a groove-like gap between the frame 1 and the auxiliary frame 5 and the electrode layers (12, 13) of the membrane electrode assembly 2. The dimensional tolerance of the frame 5 and the membrane electrode assembly 2 is absorbed, and may be omitted.

  The framed membrane electrode assembly 2 having the above configuration joins the frame 1 and the auxiliary frame 5 to the outer peripheral extension portion 11 </ b> A of the electrolyte membrane 11 by the bonding layer 14. Since this joining portion is in a continuous state from the frame 1 to the auxiliary frame 5 through the through hole 11B from the frame 1, a state where the frame 1 and the auxiliary frame 5 are substantially joined is obtained. Further, the joining portion is in a state where the electrolyte membrane 11 of the membrane electrode assembly 2 is mechanically engaged with the joining layer 14 at the portion of the through hole 11B, and so-called anchor effect can be expected.

  Thus, the membrane electrode assembly 2 with a frame has a simple structure, even when the electrolyte membrane 11 made of a hardly adhesive material such as a fluorine-based material is used, and the frame 1 and the membrane electrode assembly 2 The bonding strength with the electrolyte membrane 11 can be increased, and the durability is high.

  Thereby, the membrane electrode assembly 2 with a frame, for example, is deformed so that the frame 1 bends in the thickness direction due to a differential pressure between the anode gas and the cathode gas, or shrinkage deformation due to swelling occurs in the electrolyte membrane 11. Even in this case, a good bonding state between the frame 1 and the electrolyte membrane 11 can be maintained. Moreover, the membrane electrode assembly 2 with a frame raises the freedom degree of selection of the adhesive agent and adhesive which form the joining layer 14 with improvement of said joining strength.

  Furthermore, since the membrane electrode assembly 2 with the frame sandwiches the outer peripheral extension portion 11A of the electrolyte membrane 11 in the membrane electrode assembly 2 between the inner peripheral edge portion 1C of the frame 1 and the auxiliary frame 5, the membrane electrode assembly 2 The electrode layer (12, 13) does not exist in the outer peripheral portion of the battery, that is, the portion outside the power generation region. Thereby, the membrane electrode assembly 2 with a frame contributes to the reduction of manufacturing cost by reducing the electrode layer (12, 13) to the minimum necessary size, saving the material of the electrode layer containing an expensive catalyst. Can do.

  Furthermore, since the membrane electrode assembly 2 with a frame according to the above embodiment employs the frame 1 having the stepped portion 1B, the thickness of the inner peripheral edge portion 1C, which is a junction portion with the membrane electrode assembly 2, is the main body portion. The thickness becomes substantially equal to the thickness and becomes thick at the step portion 1B. Thereby, the membrane electrode assembly 2 with a frame ensures sufficient intensity | strength with respect to the force which acts in the thickness direction compared with the conventional structure using the resin-made frame member which has a thin-walled inner peripheral protrusion part. It is possible,

  Further, the membrane electrode assembly 2 with the frame is such that the inner peripheral edge 1C is biased to one side by the stepped portion 1B in the frame 1, and the electrolyte membrane 11 is removed by the inner peripheral edge 1C and the auxiliary frame 5. Since the circumferentially extending portion 11A is sandwiched, the thickness center of the frame 1 and the thickness center of the membrane electrode assembly 2 can be matched to join each other. Furthermore, the membrane electrode assembly 2 with a frame can improve the moldability (resin fluidity) and improve the quality by ensuring the thickness by the step portion 1B.

  In the single cell C including the membrane electrode assembly 2 with the frame, the cell module M formed by stacking the single cells C, and the fuel cell stack FS, the durability is improved along with the increase in the bonding strength, and the manufacturing cost is increased. And the like can be realized. In addition, as shown in FIG. 3, the single cell C sandwiches the joint portion between the frame 1 and the auxiliary frame 5 and the outer peripheral extension portion 11 </ b> A of the electrolyte membrane 11 by both separators 3 and 4, It is a structure that maintains it well.

  4-7 is a figure explaining other embodiment of the membrane electrode assembly with a frame concerning this invention. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

Second Embodiment
A membrane electrode assembly 2 with a frame shown in FIG. 4 has projections 1T that are paired with each other on the inner peripheral edge 1C of the frame 1 and the opposing surfaces of the auxiliary frame 5 to maintain the thickness of the bonding layer 14. , 5T. At this time, in the membrane electrode assembly 2 with a frame, as a more desirable embodiment, the through hole 11B in the outer peripheral extension portion 11A of the electrolyte membrane 11 is provided with a protrusion 1T provided in the inner peripheral edge portion 1C of the frame 1 and the auxiliary frame 5. , 5T are provided at different positions.

  In this embodiment, when an adhesive or a pressure-sensitive adhesive is applied by screen printing, as shown in FIG. 4C, the protrusions 1T and 5T are formed on the inner peripheral edge 1C and the auxiliary frame 5 of the frame 1. 4B is applied by applying an adhesive or pressure-sensitive adhesive (14) with a thickness corresponding to the height of the electrode, and then joining the two with the outer peripheral extension 11A of the electrolyte membrane 11 interposed. The bonding layer 14 is formed.

  The membrane electrode assembly 2 with the frame having the above configuration is in a state in which the outer peripheral extension portion 11A of the electrolyte membrane 11 is sandwiched between the protrusions 1T and 5T of the frame 1 and the auxiliary frame 5, and both protrusions With 1T and 5T, the distance between the frame 1 and the auxiliary frame 5, that is, the thickness of the bonding layer 14 can be kept constant. In addition, the joint area with the bonding layer 14 is expanded by the protrusions 1T and 5T, and further improvement in the bonding strength can be realized.

  Therefore, in the fuel cell stack FS formed by laminating the fuel cell single cells C including the membrane electrode assembly 2 with the frame, the thickness of the bonding layer 14 of each single cell C becomes uniform, and the bonding strength varies. Can be prevented.

  In addition, the membrane electrode assembly 2 with the frame has positions of the projecting portions 1T and 5T provided on the inner peripheral edge portion 1C of the frame 1 and the auxiliary frame 5 and the through holes 11B in the outer peripheral extension portion 11A of the electrolyte membrane 11. Therefore, the through hole 11B of the outer peripheral extension portion 11A is surely filled with an adhesive or a pressure-sensitive adhesive, and the bonding strength between the outer peripheral extension portion 11A and the bonding layer 14, and thus the frame 1 and the auxiliary The bonding strength between the frame 5 and the electrolyte membrane 11 can be kept high. Furthermore, it is possible to prevent a situation in which air is mixed between the protrusions 1T and 5T when the frame 1 and the auxiliary frame 5 are joined to the electrolyte membrane 11.

<Third Embodiment>
In the membrane electrode assembly 2 with a frame, the main part of which is shown in FIG. 5, the inner peripheral edge 1C of the frame 1 and the projections 1T and 5T of the auxiliary frame 5 are provided at a plurality of locations, and the outer periphery of the electrolyte membrane 11 is extended. Through holes 11B in the protruding portion 11A are provided at a plurality of locations.

  In this membrane electrode assembly 2 with a frame, the height of one protrusion 1TS (5TS) is set to the height of the other protrusion between the protrusions 1TS and 5TS selected from the pair of protrusions 1T and 5T. It is smaller than the height of the part 5TS (1TS). Accordingly, a gap is formed between the selected protrusions 1TS and 5TS. And the said membrane electrode assembly 2 has the structure which has arrange | positioned one through-hole 11B of each through-hole 11B between selected protrusion part 1TS, 5TS.

  FIG. 5 shows a configuration in which two pairs of protrusions 1T and 5T each have a height of one protrusion 1TS (5TS), and a through hole 11B is disposed between them. However, in addition to these, there are also projections 1T and 5T having the same height as shown in FIG. 4B, and there are also through-holes 11B at positions different from the projections 1T and 5T.

  In the membrane electrode assembly 2 with a frame, the bonding state obtained between the frame 1 and the auxiliary frame 5 in the first embodiment can be obtained also between the protrusions 1TS and 5TS.

  That is, the membrane electrode assembly 2 is in a state in which the bonding layer 14 is continuous between the protrusions 1TS and 5TS from the protrusion 1TS of the frame 1 to the protrusion 1TS of the auxiliary frame 5 through the through hole 11B. At the same time, the electrolyte membrane 11 is mechanically engaged with the bonding layer 14 at the through hole 11B.

  Thus, since the membrane electrode assembly 2 can use the top surfaces of the protrusions 1TS and 5TS as an adhesive surface, the bonding strength between the frame 1 and the auxiliary frame 5 and the electrolyte membrane 11 can be further increased. Alternatively, it is possible to reduce the size by reducing the joint area of both while securing the joint strength.

<Fourth embodiment>
6 (A) to 6 (C) show an electrolyte membrane 11 for explaining the arrangement of the projections 1T of the frame 1 and the through holes 11B of the electrolyte membrane 11 in the fourth embodiment of the membrane electrode assembly with frame according to the present invention. It is a top view of 11 A of outer periphery extension parts. The protrusion 5T of the auxiliary frame 5 is at the same position as the protrusion 1T of the frame 1. In the membrane electrode assembly with a frame of this embodiment, the through holes 11B in the outer peripheral extension portion 11A of the electrolyte membrane 11 are provided at a plurality of locations and arranged in a staggered manner.

  In the example shown in FIG. 6A, the protrusion 1T indicated by the dotted line and the through hole 11B indicated by the solid line are both circular in plan view, and the protrusions 11B are arranged at predetermined intervals. Are arranged in two rows, and a plurality of through holes 11B are arranged in a staggered manner between the rows.

  The example shown in FIG. 6B has a configuration in which two linear protrusions 11B are arranged in parallel, and a plurality of through holes 11B having a circular shape in plan view are arranged therebetween in a staggered manner.

  The example shown in FIG. 6C has a configuration in which two linear protrusions 11B are arranged in parallel, and a plurality of through holes 11B having an elliptical shape in a plan view are arranged therebetween.

  In the membrane electrode assembly having the above-described configuration, the joining layer is continuous through the through holes 11B between the frame and the auxiliary frame, and the electrolyte membrane 11 interposed between the frame and the auxiliary frame is provided. The outer peripheral extension portion 11A is mechanically engaged with the bonding layer through the through hole 11B.

  And in the membrane electrode assembly with a frame, since the plurality of through holes 11B that establish the above-mentioned joining state are arranged in a staggered manner, a high joining strength can be obtained uniformly over the whole joining portion, or the joining strength. It is also possible to reduce the size by reducing the joint area between the two while securing the above. In addition, the shape and arrangement | positioning of the projection part 1T of the flame | frame 1 and the through-hole 11B of the electrolyte membrane 11 are not limited to said each embodiment. However, since the electrolyte membrane 11 is a very thin membrane, it is more desirable that the through-hole 11B formed in the electrolyte membrane 11 is circular or elliptical as having no corners where stress is easily concentrated.

<Fifth Embodiment>
FIG. 6D is a cross-sectional view of the outer peripheral extension of the electrolyte membrane for explaining the fifth embodiment of the membrane electrode assembly with frame according to the present invention. In the membrane electrode assembly with a frame of this embodiment, the through holes 11B in the outer peripheral extension portion 11A of the electrolyte membrane 11 are provided at a plurality of locations, and the adjacent through holes 11B are indicated by arrows in the drawing. In addition, it is formed by punching from different directions.

  The above-mentioned membrane electrode assembly with a frame can obtain an equivalent joined state on both sides of the outer peripheral extension portion 11A by punching and forming adjacent through holes 11B from different directions. This is because, when the through hole 11B is formed in the outer peripheral extension portion 11A of the electrolyte membrane 11, burrs may inevitably occur at the edge of the through hole 11B, and when the through hole 11B is formed from the same direction, the outer peripheral extension There is a possibility that burrs exist only on one side of the protruding portion 11A, and a difference occurs in the bonding state on both sides of the outer peripheral extending portion 11A.

  On the other hand, the membrane electrode assembly with a frame described above is formed by punching and forming adjacent through holes 11B from different directions so that the burr is not biased to one side of the outer peripheral extension portion 11A, and the outer peripheral extension portion It is possible to make the joining state of the frame 1 and the auxiliary frame 5 and the electrolyte membrane 11 better by equalizing the joining state of both surfaces of 11A.

  In addition, the membrane electrode assembly with frame, the single cell for fuel cell, and the fuel cell stack according to the present invention are not limited to the above embodiments, and the scope of the present invention is not deviated. The material, shape, size, number, arrangement, and the like of each component can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Frame 1A Opening part 1B Step part 1C Inner peripheral edge part 1T, 5T Protrusion part 1TS, 5TS Selected protrusion part 2 Membrane electrode assembly 3, 4 Separator 5 Auxiliary frame 11 Electrolyte film 11A Outer periphery extension part 11B Through-hole 12 Fuel electrode Layer (electrode layer)
13 Air electrode layer (electrode layer)
14 Bonding layer C Single cell for fuel cell FS Fuel cell stack

Claims (9)

A membrane electrode assembly having a structure in which an electrolyte membrane is sandwiched between a pair of electrode layers;
A resin frame having an opening for disposing the membrane electrode assembly;
Provided with an auxiliary frame made of resin arranged on one side of the frame and facing the inner peripheral edge of the opening,
The electrolyte membrane of the membrane electrode assembly has an outer peripheral extension part extending to the outer peripheral side from the electrode layer, and a through hole in the thickness direction formed in the outer peripheral extension part,
Between the inner peripheral edge of the frame and the auxiliary frame, a bonding layer made of an adhesive or a pressure-sensitive adhesive is provided with an outer peripheral extension having a through hole interposed ,
The membrane electrode assembly with a frame , wherein the bonding layer is continuous from the frame to the auxiliary frame through a through hole .
  2. The framed membrane electrode according to claim 1, wherein projections are formed on the inner peripheral edge of the frame and the opposing surfaces of the auxiliary frame to maintain the thickness of the bonding layer in pairs. Joined body.   3. The framed membrane electrode assembly according to claim 2, wherein the through hole in the outer peripheral extension of the electrolyte membrane is provided at a position different from the inner peripheral edge of the frame and the protrusion provided on the auxiliary frame. . The inner peripheral edge of the frame and the protrusions of the auxiliary frame are provided at a plurality of locations,
Through holes in the outer peripheral extension of the electrolyte membrane are provided at multiple locations,
In the projections selected from among the projections that form a pair, the height of one projection is made smaller than the height of the other projection, and between the selected projections, The membrane electrode assembly with a frame according to claim 2 or 3, wherein any one of the through holes is arranged.   The through-hole in the outer periphery extension part of an electrolyte membrane is provided in several places, and is arrange | positioned at zigzag form, The membrane electrode joining with a frame of any one of Claims 1-4 characterized by the above-mentioned. body.   The through-hole in the outer periphery extension part of an electrolyte membrane is provided in several places, and adjacent through-holes are stamped and formed from the different direction, The any one of Claims 1-5 characterized by the above-mentioned. The membrane electrode assembly according to the description. The frame includes an opening in which the membrane electrode assembly is disposed, a step portion formed along the periphery of the opening and corresponding to the thickness of the frame, and an inner periphery of the opening of the frame, It is a state biased to one side of the frame by the stepped portion,
The membrane electrode assembly with a frame according to any one of claims 1 to 6, wherein the auxiliary frame is disposed on a surface of the inner peripheral edge opposite to the biased side.   A fuel cell single cell comprising the membrane electrode assembly with a frame according to any one of claims 1 to 7 and a pair of separators sandwiching the membrane electrode assembly with a frame.   A fuel cell stack having a structure in which a plurality of single cells for a fuel cell according to claim 8 are stacked.

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