WO2013042542A1 - 燃料電池用樹脂枠付き電解質膜・電極構造体 - Google Patents
燃料電池用樹脂枠付き電解質膜・電極構造体 Download PDFInfo
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- WO2013042542A1 WO2013042542A1 PCT/JP2012/072698 JP2012072698W WO2013042542A1 WO 2013042542 A1 WO2013042542 A1 WO 2013042542A1 JP 2012072698 W JP2012072698 W JP 2012072698W WO 2013042542 A1 WO2013042542 A1 WO 2013042542A1
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- WIPO (PCT)
- Prior art keywords
- electrolyte membrane
- resin frame
- electrode
- peripheral end
- electrode structure
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/028—Sealing means characterised by their material
- H01M8/0284—Organic resins; Organic polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- a first electrode and a second electrode each having an electrode catalyst layer and a gas diffusion layer are provided on both sides of a solid polymer electrolyte membrane, and the first electrode has an outer dimension larger than that of the second electrode.
- the present invention relates to an electrolyte membrane / electrode structure with a resin frame for a fuel cell, comprising: an electrolyte membrane / electrode structure in which is set small; and a resin frame member provided around the outer periphery of the solid polymer electrolyte membrane.
- a solid polymer fuel cell employs a solid polymer electrolyte membrane made of a polymer ion exchange membrane.
- This fuel cell has an electrolyte membrane / electrode structure in which an anode side electrode and a cathode side electrode each comprising a catalyst layer (electrode catalyst layer) and a gas diffusion layer (porous carbon) are disposed on both sides of a solid polymer electrolyte membrane, respectively.
- the body (MEA) is sandwiched between separators (bipolar plates).
- This fuel cell is used as, for example, an in-vehicle fuel cell stack by stacking a predetermined number of fuel cells.
- one gas diffusion layer is set to have a smaller surface area than the solid polymer electrolyte membrane, and the other gas diffusion layer is set to the same surface area as the solid polymer electrolyte membrane.
- a so-called step type MEA may be formed.
- an electrolyte membrane 1 and a cathode catalyst layer 2a disposed on one side of the electrolyte membrane 1 As shown in FIG. 18, an electrolyte membrane 1 and a cathode catalyst layer 2a disposed on one side of the electrolyte membrane 1
- the anode catalyst layer 2b disposed on the other side of the electrolyte membrane 1 and the gas diffusion layers 3a and 3b disposed on both sides of the electrolyte membrane 1 are provided.
- the gas diffusion layer 3b on the anode side is equivalent to the area of the electrolyte membrane 1 and is configured to be larger than the area of the gas diffusion layer 3a on the cathode side.
- a gasket structure 4 is disposed in the edge region of the electrolyte membrane / electrode assembly (MEA). The outer peripheral part of the electrolyte membrane 1 on the gas diffusion layer 3 a side and the gasket structure 4 are joined via an adhesive layer 5.
- the present invention solves this type of problem and circulates around the outer periphery of the solid polymer electrolyte membrane to firmly and easily join the resin frame member and reliably maintain the desired gas sealing property.
- An object of the present invention is to provide an electrolyte membrane / electrode structure with a resin frame for a fuel cell.
- a first electrode and a second electrode each having an electrode catalyst layer and a gas diffusion layer are provided on both sides of a solid polymer electrolyte membrane, and the first electrode has an outer dimension larger than that of the second electrode.
- the present invention relates to an electrolyte membrane / electrode structure with a resin frame for a fuel cell, comprising an electrolyte membrane / electrode structure that is set to be small and a resin frame member that is provided around the outer periphery of the solid polymer electrolyte membrane .
- this electrolyte membrane / electrode structure with a resin frame for a fuel cell it is exposed to the outside from the outer peripheral end of the first electrode between the outer peripheral end of the first electrode and the inner peripheral end of the resin frame member.
- positioned continuously between the outer peripheral edge part of a 2nd electrode, and the inner peripheral edge part of the said resin-made frame members are provided.
- the intermediate layer is preferably made of a resin material different from that of the resin frame member.
- an impregnation layer impregnated with the same component as the intermediate layer is provided on the outer peripheral edge of at least one gas diffusion layer.
- the impregnation layer is impregnated in the gas diffusion layer with a porosity filling rate of 85% or more.
- the first intermediate electrode is disposed between one end of the intermediate layer and the outer peripheral end of the first electrode and the inner peripheral end of the resin frame member.
- a gap is formed, and a second gap is formed between the other end of the intermediate layer and the outer peripheral end of the second electrode and the inner peripheral end of the resin frame member.
- the first protrusion provided integrally with or separately from the resin frame member is melted to form the first resin impregnated portion, while the second gap is formed in the resin frame member.
- the 2nd protrusion part provided integrally or separately is fuse
- an intermediate layer is provided continuously between the inner peripheral end of the member.
- the bonding strength between the first electrode and the second electrode and the resin frame member is improved better than the bonding by bonding, and the occurrence of peeling or the like can be suppressed as much as possible.
- FIG. 2 is a cross-sectional explanatory view taken along the line II-II in FIG. 1 of the fuel cell. It is front explanatory drawing by the side of the cathode side electrode of the said electrolyte membrane and electrode structure with a resin frame. It is front explanatory drawing by the side of the anode side electrode of the said electrolyte membrane and electrode structure with a resin frame. It is explanatory drawing of the method to manufacture the said electrolyte membrane-electrode structure with a resin frame.
- FIG. 2 is an explanatory diagram of an electrolyte membrane-electrode assembly disclosed in Japanese Patent Application Laid-Open No. 2007-66766.
- the polymer electrolyte fuel cell 12 incorporating the resin frame-equipped electrolyte membrane / electrode structure 10 according to the first embodiment of the present invention includes the resin frame-equipped electrolyte membrane / electrode.
- the structure 10 is sandwiched between the first separator 14 and the second separator 16.
- 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 plated steel plate, a metal plate whose surface is subjected to anticorrosion treatment, a carbon member, or the like. .
- an electrolyte membrane / electrode structure 10 with a resin frame is provided with an electrolyte membrane / electrode structure 10a, and the electrolyte membrane / electrode structure 10a is formed of, for example, a perfluorosulfonic acid thin film with water.
- the solid polymer electrolyte membrane 18 uses an HC (hydrocarbon) electrolyte in addition to a fluorine electrolyte.
- the cathode side electrode 22 has a smaller surface area than the solid polymer electrolyte membrane 18 and the anode side electrode 20.
- the cathode side electrode 22 may have a larger surface area than the anode side electrode 20.
- the outer peripheral edge of the solid polymer electrolyte membrane 18 only needs to protrude from the outer periphery of the smaller electrode, for example, the cathode side electrode 22, and is located at the same position as the end of the larger electrode, for example, the anode side electrode 20. It does not need to be arranged.
- the anode side electrode 20 is disposed on one surface 18 a of the solid polymer electrolyte membrane 18.
- the cathode side electrode 22 is disposed on the other surface 18b of the solid polymer electrolyte membrane 18, and exposes the outer peripheral end portion 18be of the solid polymer electrolyte membrane 18 in a frame shape.
- the anode side electrode 20 is provided with an electrode catalyst layer 20a joined to the surface 18a of the solid polymer electrolyte membrane 18, and a gas diffusion layer 20b laminated on the electrode catalyst layer 20a.
- the cathode side electrode 22 is provided with an electrode catalyst layer 22a joined to the surface 18b of the solid polymer electrolyte membrane 18, and a gas diffusion layer 22b laminated on the electrode catalyst layer 22a.
- the electrode catalyst layers 20a and 22a form catalyst particles in which platinum particles are supported on carbon black, use a polymer electrolyte as an ion conductive binder, and uniformly mix the catalyst particles in a solution of the polymer electrolyte.
- the catalyst paste produced in this way is configured by printing, coating or transferring on both sides of the solid polymer electrolyte membrane 18.
- the gas diffusion layers 20b and 22b are made of carbon paper or the like, and the plane dimension of the gas diffusion layer 20b is set larger than the plane dimension of the gas diffusion layer 22b.
- the electrolyte membrane / electrode structure 10 with a resin frame circulates around the outer periphery of the solid polymer electrolyte membrane 18 and is made of a resin bonded to the cathode side electrode 22 and the anode side electrode 20.
- a frame member 24 is provided.
- the resin frame member 24 may be made of PPS (polyphenylene sulfide), PPA (polyphthalamide), or the like, or may be made of an elastic polymer material.
- the resin frame member 24 is provided with a stepped opening therein, and a first inner peripheral end portion 24a disposed inward and a first inner peripheral end portion 24a disposed outer than the first inner peripheral end portion 24a. 2 inner peripheral end 24b.
- An intermediate layer 26 is provided between the resin frame member 24 and the electrolyte membrane / electrode structure 10a.
- the intermediate layer 26 includes a first plate-like portion 26a disposed between the outer peripheral end portion 22be of the gas diffusion layer 22b constituting the cathode side electrode 22 and the first inner peripheral end portion 24a of the resin frame member 24,
- the second plate-like portion 26b disposed on the outer peripheral end portion 18be of the solid polymer electrolyte membrane 18 exposed to the outside from the outer peripheral end portion 22be, the outer peripheral end portion 20be of the gas diffusion layer 20b constituting the anode side electrode 20, and the aforementioned
- a third plate-like portion 26c disposed between the second inner peripheral end portion 24b of the resin frame member 24 is continuously and integrally formed.
- the intermediate layer 26 has a substantially Z-shaped cross section and is made of a resin material different from the resin frame member 24.
- the intermediate layer 26 is made of silicon rubber (elastomer), fluororubber (elastomer), epoxy resin (elastomer), urethane resin (elastomer), modified PET (polyethylene terephthalate) resin (elastomer), PVDF ( Polyvinylidene fluoride) resin (elastomer), olefin resin (elastomer), hot melt or the like is used.
- a first impregnation layer 28a having a predetermined range inward from the outer peripheral end position and impregnated with the same components as the intermediate layer 26 is provided on the outer peripheral edge of the gas diffusion layer 22b constituting the cathode side electrode 22. It is done.
- a second impregnated layer 28b having a predetermined range inward from the outer peripheral end position and impregnated with the same components as the intermediate layer 26 is provided at the outer peripheral edge of the gas diffusion layer 20b constituting the anode side electrode 20. It is done.
- the first impregnation layer 28a and the second impregnation layer 28b are impregnated in the gas diffusion layer 22b and the gas diffusion layer 20b, respectively, with a filling factor of 85% or more.
- the first impregnation layer 28 a is formed over the entire circumference of the gas diffusion layer 22 b constituting the cathode side electrode 22.
- the second impregnation layer 28 b is formed over the entire circumference of the gas diffusion layer 20 b constituting the anode side electrode 20.
- one end edge of the fuel cell 12 in the arrow B direction communicates with each other in the arrow A direction, which is the stacking direction, and contains an oxidant gas, for example, oxygen
- 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, a fuel gas inlet communication hole 34a for supplying fuel gas, and a cooling medium outlet communication hole for discharging the cooling medium.
- 32b and an oxidant gas outlet communication hole 30b for discharging the oxidant gas are arranged in the direction of arrow C.
- An oxidant gas flow path 36 communicating with the oxidant gas inlet communication hole 30a and the oxidant gas outlet communication hole 30b is provided on the surface 16a of the second separator 16 facing the electrolyte membrane / electrode structure 10 with a resin frame. .
- a fuel gas flow path 38 communicating with the fuel gas inlet communication hole 34a and the fuel gas outlet communication hole 34b is formed on the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 10 with a resin frame. Between the surface 14 b of the first separator 14 and the surface 16 b of the second separator 16, a cooling medium flow path 40 communicating with the cooling medium inlet communication hole 32 a and the cooling medium outlet communication hole 32 b is formed.
- 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, and the second The second seal member 44 is integrated with the surfaces 16 a and 16 b of the separator 16 around the outer peripheral end of the second separator 16.
- the first seal member 42 includes a first convex seal 42 a that contacts the resin frame member 24 of the electrolyte membrane / electrode structure 10 with a resin frame, and a second seal member of the second separator 16. And a second convex seal 42 b that abuts on 44.
- the second seal member 44 constitutes a flat seal.
- the second seal member 44 may be provided with a convex seal (not shown).
- the first and second sealing members 42 and 44 include, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber, a cushioning material, Alternatively, an elastic seal member such as a packing material is used.
- the first separator 14 has a supply hole portion 46 that communicates the fuel gas inlet communication hole 34a with the fuel gas passage 38, and the fuel gas passage 38 communicates with the fuel gas outlet communication hole 34b.
- a discharge hole 48 is formed.
- an electrolyte membrane / electrode structure 10a which is a step MEA is manufactured. Specifically, electrode catalyst layers 20 a and 22 a are applied to both surfaces 18 a and 18 b of the solid polymer electrolyte membrane 18. A gas diffusion layer 20b is disposed on the surface 18a side of the solid polymer electrolyte membrane 18, that is, the electrode catalyst layer 20a, and at the surface 18b of the solid polymer electrolyte membrane 18, that is, on the electrode catalyst layer 22a. A gas diffusion layer 22b is disposed.
- the electrolyte membrane / electrode structure 10a is manufactured by stacking these together and subjecting them to hot pressing.
- the resin frame member 24 is molded in advance by an injection molding machine (not shown), and the resin frame member 24 and the electrolyte membrane / electrode structure 10a are aligned.
- the resin frame member 24 has a first inner peripheral end 24a and a second inner peripheral end 24b.
- the outer peripheral end 18be of the solid polymer electrolyte membrane 18 is exposed in a frame shape, and the second plate-like portion 26b constituting the intermediate layer 26 corresponding to the outer peripheral end 18be. Is placed.
- the resin-made frame member 24 and the electrolyte membrane / electrode structure 10a are arranged such that the cathode-side electrode 22 is disposed at the first inner peripheral end 24a, while the second inner peripheral end 24b.
- the solid polymer electrolyte membrane 18 and the anode-side electrode 20 are disposed on the second plate-like portion 26b and integrated with each other.
- the first inner peripheral end portion 24a and the outer peripheral end portion 22be of the gas diffusion layer 22b constituting the cathode side electrode 22 and the second inner peripheral end portion 24b and the gas diffusion layer constituting the anode side electrode 20
- gaps S1 and S2 are provided, respectively.
- the same material of the intermediate layer 26 as the second plate-like portion 26b is injected into each of the gaps S1 and S2. For this reason, the material filled in the gaps S1 and S2 is hardened to form the first plate-like portion 26a and the third plate-like portion 26c, and these are integrated with the second plate-like portion 26b to form the intermediate layer. 26 is formed.
- the first plate-like portion 26a, the second plate-like portion 26b, and the third plate-like portion 26c may have different material compositions as long as the adhesion is good.
- the injected material is impregnated in the gas diffusion layers 22b and 20b. Accordingly, the first impregnation layer 28a is provided on the outer peripheral edge of the gas diffusion layer 22b with a predetermined range inward from the outer peripheral end position. On the other hand, the second impregnation layer 28b is provided on the outer peripheral edge of the gas diffusion layer 20b with a predetermined range inward from the outer peripheral end position.
- the first impregnation layer 28a and the second impregnation layer 28b are impregnated into the gas diffusion layer 22b and the gas diffusion layer 20b with a pore filling rate of 85% or more, respectively.
- the hole filling rate and the gas diffusion layer flow rate have a relationship shown in FIG. 8 as an evaluation result by a palm porometer, for example. Thereby, if the hole filling rate is 85% or more, the gas can be reliably sealed.
- an intermediate layer 26 is provided between the resin frame member 24 and the electrolyte membrane / electrode structure 10a.
- the intermediate layer 26 is a first plate-like portion 26 a that is disposed without a gap between the outer peripheral end portion 22 be of the gas diffusion layer 22 b constituting the cathode side electrode 22 and the first inner peripheral end portion 24 a of the resin frame member 24.
- the gas diffusion layer 22b and the gas diffusion layer 20b are provided with a first impregnation layer 28a and a second impregnation layer 28b. Only the first impregnation layer 28a or the second impregnation layer 28b may be provided.
- the joining strength of the cathode side electrode 22 and the anode side electrode 20 and the resin frame member 24 can be improved better than the joining by adhesion, and the occurrence of peeling or the like can be suppressed as much as possible.
- first inner peripheral end 24 a and the outer peripheral end 22 be of the gas diffusion layer 22 b constituting the cathode side electrode 22, and the second inner peripheral end 24 b and the gas diffusion layer 20 b constituting the anode side electrode 20.
- a gap is not formed between the outer peripheral end portion 20be. Therefore, the desired gas sealing performance can be reliably maintained, and the effect that the mixing of the fuel gas and the oxidant gas can be suppressed as much as possible with a simple and economical configuration can be obtained. .
- an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 30a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 34a. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 32a.
- 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 the cathode side electrode 22 of the electrolyte membrane / electrode structure 10a.
- the fuel gas is introduced from the fuel gas inlet communication hole 34 a through the supply hole 46 into the fuel gas flow path 38 of the first separator 14. The fuel gas moves in the direction of arrow B along the fuel gas flow path 38 and is supplied to the anode side electrode 20 of the electrolyte membrane / electrode structure 10a.
- each electrolyte membrane / electrode structure 10a the oxidant gas supplied to the cathode side electrode 22 and the fuel gas supplied to the anode side electrode 20 are consumed by an electrochemical reaction in the electrode catalyst layer. Power generation is performed.
- the oxidant gas supplied to and consumed by the cathode side electrode 22 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 30b.
- the fuel gas consumed by being supplied to the anode side electrode 20 passes through the discharge hole portion 48 and is discharged in the direction of arrow A along the fuel gas outlet communication hole 34b.
- the cooling medium supplied to the cooling medium inlet communication hole 32a is introduced into the cooling medium flow path 40 between the first separator 14 and the second separator 16, and then flows in the direction of arrow B.
- the cooling medium is discharged from the cooling medium outlet communication hole 32b after the electrolyte membrane / electrode structure 10a is cooled.
- a liquid seal LS made of the same material as the intermediate layer 26 is formed on the outer periphery of the electrolyte membrane / electrode structure 10a.
- the liquid seal LS includes an outer peripheral end 22be of the gas diffusion layer 22b constituting the cathode side electrode 22, an outer peripheral end 18be of the solid polymer electrolyte membrane 18, and an outer peripheral end 20be of the gas diffusion layer 20b constituting the anode side electrode 20.
- the first impregnation layer 28a and the second impregnation layer 28b are integrally formed.
- the resin frame member 24 is integrated with the electrolyte membrane / electrode structure 10a as shown in FIG. Therefore, the semi-cured liquid seal LS flows and cures in the gaps S1 and S2 formed between the electrolyte membrane / electrode structure 10a and the resin frame member 24. Accordingly, by removing the flash (not shown) extending outward from the resin frame member 24, the electrolyte membrane / electrode structure 10 with a resin frame is obtained.
- FIG. 11 is an exploded perspective view of a main part of a polymer electrolyte fuel cell 62 in which an electrolyte membrane / electrode structure 60 with a resin frame according to a second embodiment of the present invention is incorporated.
- the electrolyte membrane / electrode structure 60 with a resin frame includes an electrolyte membrane / electrode structure 10a, and is made of a resin that goes around the outer periphery of the solid polymer electrolyte membrane 18 and is joined to the cathode side electrode 22 and the anode side electrode 20.
- a frame member 64 is provided.
- the resin frame member 64 is set to have the same outer dimensions as the first separator 14 and the second separator 16, and has an oxidant gas inlet communication hole 30 a, a cooling medium inlet communication hole 32 a, and fuel gas at the outer peripheral edge.
- An outlet communication hole 34b, a fuel gas inlet communication hole 34a, a cooling medium outlet communication hole 32b, and an oxidant gas outlet communication hole 30b are formed.
- an intermediate layer 26 is provided between the resin frame member 64 and the electrolyte membrane / electrode structure 10a, and the gas diffusion layer 22b and the gas diffusion layer 20b are provided. Are provided with a first impregnation layer 28a and a second impregnation layer 28b.
- the bonding strength of the cathode side electrode 22 and the anode side electrode 20 and the resin frame member 64 can be improved better than the bonding by bonding, and the occurrence of peeling or the like can be suppressed as much as possible.
- the same effects as those of the first embodiment described above can be obtained, for example, it is possible to suppress the mixing of the fuel gas and the oxidant gas as much as possible with a simple and economical configuration.
- FIG. 12 is a cross-sectional explanatory view of a polymer electrolyte fuel cell 72 in which an electrolyte membrane / electrode structure 70 with a resin frame according to a third embodiment of the present invention is incorporated.
- the electrolyte membrane / electrode structure 70 with a resin frame is provided with an electrolyte membrane / electrode structure 10 a and is made of a resin that goes around the outer periphery of the solid polymer electrolyte membrane 18 and is bonded to the cathode side electrode 22 and the anode side electrode 20.
- a frame member 74 is provided.
- the resin frame member 74 is set to have the same outer dimensions as the first separator 14 and the second separator 16. Seal members 76 a and 76 b are interposed between the resin frame member 74 and the first separator 14 and the second separator 16, respectively.
- FIG. 13 is a cross-sectional explanatory view of a polymer electrolyte fuel cell 82 in which an electrolyte membrane / electrode structure 80 with a resin frame according to a fourth embodiment of the present invention is incorporated.
- the electrolyte membrane / electrode structure 80 with a resin frame is provided with an electrolyte membrane / electrode structure 10 a and is made of a resin that circulates around the outer periphery of the solid polymer electrolyte membrane 18 and is bonded to the cathode side electrode 22 and the anode side electrode 20.
- a frame member 84 is provided.
- the resin frame member 84 is set to have a larger outer dimension than the first separator 14 and the second separator 16.
- a seal member 86 a is interposed between the resin frame member 84 and the first separator 14, and between the resin frame member 84, the first separator 14 and the second separator 16 are disposed outward.
- the seal member 86b is interposed at the position.
- FIG. 14 is a cross-sectional explanatory view of a polymer electrolyte fuel cell 92 in which an electrolyte membrane / electrode structure 90 with a resin frame according to a fifth embodiment of the present invention is incorporated.
- an intermediate layer 94 is provided between the resin frame member 93 constituting the electrolyte membrane / electrode structure 90 with a resin frame and the electrolyte membrane / electrode structure 10a.
- the intermediate layer 94 is made of the same material as the intermediate layer 26 and has a substantially Z-shaped cross section. Between one end of the intermediate layer 94 and the outer peripheral end 22be of the gas diffusion layer 22b constituting the cathode side electrode 22 and the first inner peripheral end 93a of the resin frame member 93, a first gap 96a is formed. Is formed.
- a second gap 96b is provided between the other end of the intermediate layer 94 and the outer peripheral end 20be of the gas diffusion layer 20b constituting the anode-side electrode 20 and the second inner peripheral end 93b of the resin frame member 93. Is formed.
- the first protrusion 98a provided integrally or separately with the resin frame member 93 is melted to form the first resin impregnated portion 100a.
- the second protrusion 98b provided integrally with or separately from the resin frame member 93 is melted to form the second resin impregnated portion 100b.
- the first resin impregnated portion 100a is provided so as to partially overlap one end portion of the intermediate layer 94 and impregnated inside the gas diffusion layer 22b, and the second resin impregnated portion 100b is provided on the other side of the intermediate layer 94.
- the gas diffusion layer 20b is provided so as to partially overlap with the end of the gas diffusion layer 20b.
- the gas diffusion layers 22b and 20b are provided with adhesive layers 102a and 102b impregnated with a part of the intermediate layer 94, respectively.
- the resin frame member 93 is formed by an injection molding machine (not shown), and one outer surface of the resin frame member 93 (on the first inner peripheral end 93a side). Is formed integrally with a frame-shaped first protrusion 98a that circulates around the first inner peripheral end portion 93a. On the other outer surface (the outer surface on the second inner peripheral end portion 93b side) of the resin frame member 93, a frame-shaped second protrusion 98b that circulates around the second inner peripheral end portion 93b is integrally formed.
- the first projecting portion 98 a and the second projecting portion 98 b may be formed by a frame member that is separate from the resin frame member 93, and may be disposed so as to overlap the resin frame member 93.
- the resin frame member 93 and the electrolyte membrane / electrode structure 10a are aligned, and a plate-like member 94a constituting the intermediate layer 94 is disposed corresponding to the outer peripheral end 18be of the solid polymer electrolyte membrane 18. .
- the resin-made frame member 93 and the electrolyte membrane / electrode structure 10a are configured such that the cathode-side electrode 22 is disposed at the first inner peripheral end portion 93a, while the second inner peripheral end portion 93b.
- the solid polymer electrolyte membrane 18 and the anode-side electrode 20 are disposed on and integrated with each other via a plate-like member 94a.
- the plate member 94a is sandwiched between the resin frame member 93 and the electrolyte membrane / electrode structure 10a. For this reason, the plate-like member 94a is formed between the first inner peripheral end portion 93a and the outer peripheral end portion 22be of the gas diffusion layer 22b constituting the cathode side electrode 22, and the second inner peripheral end portion 93b and the anode side electrode 20.
- the intermediate layer 94 having a substantially Z-shaped cross section is obtained by entering between the outer peripheral end 20be of the gas diffusion layer 20b constituting the.
- the gap between one end of the intermediate layer 94 and the outer peripheral end 22be of the gas diffusion layer 22b constituting the cathode-side electrode 22 and the first inner peripheral end 93a of the resin frame member 93 is between the first end.
- One gap 96a is formed.
- the second end portion of the intermediate layer 94 and the outer peripheral end portion 20be of the gas diffusion layer 20b constituting the anode-side electrode 20 and the second inner peripheral end portion 93b of the resin frame member 93 are not connected to each other.
- a gap 96b is formed.
- the first protrusion 98a and the second protrusion 98b of the resin frame member 93 are heated.
- the heating method laser welding, infrared welding, impulse welding, or the like is employed.
- the first protrusion 98a is heated and melted and impregnated in the gas diffusion layer 22b constituting the cathode-side electrode 22 so as to cover the first gap 96a.
- the second protrusion 98b is melted by heating and impregnates the gas diffusion layer 20b constituting the anode-side electrode 20 so as to cover the second gap 96b.
- the electrolyte membrane and electrode structure 90 with a resin frame is manufactured.
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Abstract
Description
Claims (5)
- それぞれ電極触媒層(22a、20a)とガス拡散層(22b、20b)とを有する第1電極(22)及び第2電極(20)が、固体高分子電解質膜(18)の両側に設けられるとともに、前記第1電極(22)は、前記第2電極(20)よりも外形寸法が小さく設定される電解質膜・電極構造体(10a)と、
前記固体高分子電解質膜(18)の外周を周回して設けられる樹脂製枠部材(24、93)と、
を備える燃料電池用樹脂枠付き電解質膜・電極構造体であって、
前記第1電極(22)の外周端部(22be)と前記樹脂製枠部材(24、93)の内周端部(24a、93a)との間、前記第1電極(22)の前記外周端部(22be)から外部に露呈する前記固体高分子電解質膜(18)の外周縁部(18be)、及び前記第2電極(20)の外周端部(20be)と前記樹脂製枠部材(24、93)の内周端部(24b、93b)との間に連続して配置される中間層(26、94)を備えることを特徴とする燃料電池用樹脂枠付き電解質膜・電極構造体。 - 請求項1記載の燃料電池用樹脂枠付き電解質膜・電極構造体において、前記中間層(26、94)は、前記樹脂製枠部材(24、93)とは異なる樹脂材料で構成されることを特徴とする燃料電池用樹脂枠付き電解質膜・電極構造体。
- 請求項1又は2記載の燃料電池用樹脂枠付き電解質膜・電極構造体において、少なくとも一方の前記ガス拡散層(22b)の外周端縁部には、前記中間層(26)と同一の成分が含浸される含浸層(28a)が設けられることを特徴とする燃料電池用樹脂枠付き電解質膜・電極構造体。
- 請求項3記載の燃料電池用樹脂枠付き電解質膜・電極構造体において、前記含浸層(28a)は、前記ガス拡散層(22b)に85%以上の空孔充填率で含浸されることを特徴とする燃料電池用樹脂枠付き電解質膜・電極構造体。
- 請求項1又は2記載の燃料電池用樹脂枠付き電解質膜・電極構造体において、前記中間層(94)の一方の端部と前記第1電極(22)の前記外周端部(22be)及び前記樹脂製枠部材(93)の前記内周端部(93a)との間には、第1隙間(96a)が形成されるとともに、
前記中間層(94)の他方の端部と前記第2電極(20)の前記外周端部(20be)及び前記樹脂製枠部材(93)の前記内周端部(93b)との間には、第2隙間(96b)が形成され、
前記第1隙間(96a)には、前記樹脂製枠部材(93)に一体又は別体に設けられた第1突起部(98a)が溶融されて第1樹脂含浸部(100a)が形成される一方、
前記第2隙間(96b)には、前記樹脂製枠部材(93)に一体又は別体に設けられた第2突起部(98b)が溶融されて第2樹脂含浸部(100b)が形成されることを特徴とする燃料電池用樹脂枠付き電解質膜・電極構造体。
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DE112012003942.4T DE112012003942B4 (de) | 2011-09-22 | 2012-09-06 | Elektrolyt-Membran-Elektrodenstruktur mit Harz-/Kunstharzrahmen für Brennstoffzellen |
CN201280046196.7A CN103828107B (zh) | 2011-09-22 | 2012-09-06 | 燃料电池用带有树脂框的电解质膜电极构造体 |
US14/346,377 US9966623B2 (en) | 2011-09-22 | 2012-09-06 | Electrolyte membrane-electrode structure with resin frame for fuel cells |
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