JP4802452B2 - Fuel cell and manufacturing method thereof - Google Patents

Description

  The present invention relates to a fuel cell and a manufacturing method thereof.

  A fuel cell is a power generation system in which a catalyst layer (anode electrode and cathode electrode) is arranged on both sides of an ion conductive polymer electrolyte and generates electricity by an electrochemical reaction between hydrogen and oxygen. Only water is generated during power generation. It is. Unlike conventional internal combustion engines, it does not generate environmentally harmful gases such as carbon dioxide, and is therefore attracting attention as a next-generation clean energy system.

  A polymer electrolyte fuel cell is a battery using a hydrogen ion conductive polymer electrolyte membrane as an electrolyte. The fuel cell includes an electrolyte membrane with a catalyst layer called CCM (Catalyst Coated Membrane) in which catalyst layers (anode electrode and cathode electrode) made of platinum or a platinum compound are arranged on both sides of the polymer electrolyte membrane. It is configured by being sandwiched between flexible gas diffusion layer electrodes made of carbon cloth.

  Such fuel cells are used in a wide range of fields such as personal computers, portable terminal devices (cell phones, PDAs, etc.), video cameras, automobiles, home water heaters, robots, satellites, and the like.

  In the fuel cell, the electromotive force generated in the fuel cell is substantially 1 V or less per cell, and a plurality of fuel cells are connected in series to obtain the battery voltage required for each device depending on the application. There is a need. Therefore, a plurality of fuel cells are stacked in a vertical direction through a separator made of conductive carbon or metal and sealed, and a voltage is taken out in series from the separator or current collector plate. B) A polymer electrolyte membrane is processed or arranged so that it can be connected in series in a plane direction, and a necessary voltage is taken out.

  For example, Patent Document 1 discloses a fuel cell in which a plurality of sheet-like fuel cells are stacked in series using a sealing material via a separator, a current collector plate, and a gasket so as to be in series.

  Patent Document 2 is a fuel cell in which one end side and the other end side of a plurality of sheet-like fuel cells are joined in series with each other via a polymer electrolyte membrane, and each fuel cell has gas diffusion. A fuel cell comprising a sheet and a gas reaction layer is disclosed.

  However, the fuel cells described in these patent documents have various drawbacks and have not been put into practical use.

  Since the fuel cell of Patent Document 1 needs to insert a current collector plate for each fuel cell, when stacked in the vertical direction, the fuel cell becomes bulky and has a drawback that it is difficult to make it compact. For this reason, the fuel cell of this document cannot be used for applications where downsizing is required, such as personal computers, portable terminal devices (cell phones, PDAs, etc.), video cameras, and the like. Moreover, when manufacturing the fuel cell of this literature, the alignment for laminating a plurality of constituent members such as current collector plates in the vertical direction is not easy and is not suitable for industrialization.

Since the gas diffusion sheet constituting the fuel cell of Patent Document 2 is made of carbon black and polytetrafluoroethylene, the bending strength is low and the durability is inferior. For this reason, the fuel cell is exposed to fuel gas and oxidant gas and deteriorates due to the exposed current collecting layer such as a copper film embedded in the gas diffusion sheet due to cracking, peeling, etc. of the gas diffusion sheet. It has the disadvantage that it cannot be avoided.
JP-A-8-45517 (Claims) JP-A-5-41221 (Claims)

  An object of the present invention is to provide a fuel cell that does not have the above drawbacks.

  As a result of intensive studies to solve the above problems, the present inventor has provided gas diffusion electrodes on both surfaces of an electrolyte membrane sheet laminated in the order of anode electrode / hydrogen ion conductive polymer electrolyte membrane / cathode electrode. A desired fuel cell can be manufactured by arranging a plurality of joined fuel cells and electrically connecting the anode electrode of the fuel cell and the cathode electrode of the fuel cell adjacent to the cell by a current collecting sheet. I found out. The present invention has been completed based on such findings.

The present invention provides the following inventions 1 to 4.
1. It consists of two or more fuel cells having gas diffusion electrodes joined to both surfaces of an electrolyte membrane sheet laminated in the order of anode electrode / hydrogen ion conductive polymer electrolyte membrane / cathode electrode, and the anode side of the fuel cell and the cell The cathode electrode side of the fuel cell adjacent to is electrically connected by a current collector sheet, and the current collector sheet is a layer laminated in the order of insulating layer / adhesive layer / current collector layer / adhesive layer / insulating layer A polymer electrolyte fuel cell having a configuration, wherein the insulating layer is a plastic film and the adhesive layer is made of a thermoplastic resin .
2. 2. The fuel cell according to 1 above, wherein adjacent fuel cells are separated from each other by a current collector sheet.
3. 2. The fuel cell according to 1, wherein the plastic film is a polyethylene terephthalate film or a polyamide film, and the thermoplastic resin is a polyolefin resin.
4). It consists of two or more fuel cells having gas diffusion electrodes joined to both surfaces of an electrolyte membrane sheet laminated in the order of anode electrode / hydrogen ion conductive polymer electrolyte membrane / cathode electrode, and the anode side of the fuel cell and the cell The cathode electrode side of the fuel cell adjacent to is electrically connected by a current collector sheet, and the current collector sheet is a layer laminated in the order of insulating layer / adhesive layer / current collector layer / adhesive layer / insulating layer The insulating layer is a plastic film, and the adhesive layer is a method for producing a polymer electrolyte fuel cell comprising a thermoplastic resin ,
Production of a polymer electrolyte fuel cell comprising a step of heat-sealing or hot-pressing the end of the anode of the fuel cell and the end of the cathode of the fuel cell adjacent to the cell via a current collector sheet Method.

The current collector sheet has a function of connecting two or more fuel cells (for example, two or more sheet-like fuel cells) having catalyst layers (anode electrode and cathode electrode) formed on both surfaces of the electrolyte membrane. have.

  The current collecting sheet of the present invention has a layer structure in which an insulating layer / adhesive layer / current collecting layer / adhesive layer / insulating layer are laminated in this order.

  A cross-sectional view showing one embodiment of the current collector sheet of the present invention is shown in FIG.

  FIG. 1 is a cross-sectional view of the current collector sheet of the present invention. In FIG. 1, 1 and 5 are insulating layers, 2 and 4 are adhesive layers, and 3 is a current collecting layer.

  The current collecting sheet according to the present invention includes an insulating layer / adhesive layer disposed across the current collecting layer and a length in an extending direction of the sheet in the adhesive layer / insulating layer at a connection portion between the sheet and the fuel cell. Are preferably different. By shortening the length in the extending direction of the adhesive layer / insulating layer on the side close to the electrolyte of the fuel cell, the current collecting layer can easily and reliably contact the anode or cathode of the fuel cell, Electricity can be taken out stably.

  The current collecting sheet of the present invention is such that, at the connecting portion between the sheet and the fuel cell, the peripheral edge of the adhesive layer disposed on the side away from the electrolyte is positioned outward from the peripheral edge of the current collecting layer. It is preferable.

  FIG. 2 is a plan view showing a preferred embodiment of the current collector sheet of the present invention, and FIG. 2 and 3, 1 and 5 are insulating layers, 2 and 4 are adhesive layers, and 3 is a current collecting layer.

  The current collecting sheet of the present invention is manufactured by laminating the materials constituting the insulating layer, the adhesive layer, and the current collecting layer. Lamination can be performed by applying, for example, a laminating method.

  Examples of the laminating method include known laminating methods such as a dry laminating method, a sandwich laminating method, a coextrusion laminating method, and a thermal laminating method.

  The insulating layer has a function of imparting insulating properties and heat resistance to the current collector sheet. As a base material which comprises an insulating layer, various plastic films can be used, for example.

  Examples of such plastic films include known heat-resistant resin films, more specifically, polyethylene terephthalate, polymethylpentene, polyacetal, polyparvanic acid aramid, polyamide (nylon), polysulfone, polyethersulfone, polyphenylene sulfide, polyphenylene sulfide. Ether-etherketone, polyetherimide, polyarylate, polyethylene naphthalate, ethylenetetrafluoroethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroperfluoroalkyl vinyl ether copolymer Examples thereof include films made of fluororesins such as (PFA) and polytetrafluoroethylene (PTFE).

  As the plastic film, a polymer film that is inexpensive and easily available is preferable. Among the polymer films, a polyethylene terephthalate film and a polyamide (nylon) film are preferable.

  The thickness of the insulating layer (plastic film) is usually about 6 to 100 μm, preferably about 6 to 30 μm, and more preferably about 6 to 15 μm from the viewpoints of handleability and economy.

  As a base material which comprises an adhesive layer, a thermoplastic resin can be mentioned, for example, Among these, polyolefin resin is suitable.

  Examples of polyolefin resins include propylene resins (polypropylene, ethylene-propylene copolymer, ethylene-propylene-butene copolymer, acid-modified polypropylene (for example, polypropylene grafted with unsaturated carboxylic acid)), ethylene-based resins, and the like. Resin (low density polyethylene, medium density polyethylene, high density polyethylene, cotton-like low density polyethylene, ethylene-butene copolymer, ethylene-acrylic acid-methacrylic acid derivative copolymer, ethylene-vinyl acetate copolymer, containing metal ions Examples thereof include polyethylene, acid-modified polyethylene (for example, polyethylene grafted with unsaturated carboxylic acid), blends of the propylene resin and ethylene resin, and the like.

  Among these, acid-modified polyolefin resins such as acid-modified polypropylene and acid-modified polyethylene are preferable in consideration of adhesiveness to a current collecting layer made of a metal described later.

  The thickness of the adhesive layer (thermoplastic film) is usually about 3 to 100 μm, preferably about 3 to 30 μm, more preferably about 5 to 15 μm.

  As a base material which comprises a current collection layer, metals, such as aluminum, stainless steel, copper, nickel, can be mentioned, for example. The shape of the metal is usually a plate shape, but may be processed into a mesh shape. In order to prevent corrosion, the metal surface may be subjected to corrosion resistance treatment.

  The thickness of the current collecting layer (metal) is usually about 3 to 100 μm, preferably about 3 to 30 μm, more preferably about 3 to 20 μm.

  The two insulating layers constituting the current collecting sheet of the present invention may be made of the same plastic film or different plastic films.

  The two adhesive layers constituting the current collector sheet of the present invention may be made of the same thermoplastic film or may be made of different thermoplastic films.

  The current collector sheet of the present invention is manufactured, for example, as follows.

  First, two rolls are prepared by winding a laminate of an insulating layer and an adhesive layer (for example, polyethylene terephthalate laminated with an ethylene resin such as polyethylene). These rolls are called roll a and roll b. Moreover, the roll which wound up sealing copper foil is prepared. This roll is referred to as roll c.

  Centering on roll c, roll a is slightly to the right in the flow direction, roll b is slightly to the left in the flow direction, and the adhesive layer side of the laminate of roll a and roll b faces the copper foil of roll c As described above, a roll a, a roll b, and a roll c are arranged and heat seal lamination is performed, thereby forming a laminate of insulating layer / adhesive layer / current collecting layer / adhesive layer / insulating layer. Next, the current collector sheet of the present invention as shown in FIGS. 2 and 3 is obtained by cutting the laminate in a direction orthogonal to the flow direction.

  Also, three rolls (roll a, roll b, and roll c) are prepared, and the roll a and the roll b are supplied so that they are slightly shifted in the left-right direction with respect to the flow direction, and the roll c is orthogonal to the roll c. Supplying from the direction, heat seal lamination is performed in a state where the laminated body supplied from the roll a and the roll b protrudes around the copper foil 4 supplied from the roll c, and cut to a predetermined length. Thus, a current collector sheet as shown in FIG. 4 can be manufactured.

  FIG. 4 is a plan view showing a preferred embodiment of the current collector sheet of the present invention. In FIG. 4, 1 and 5 are insulating layers, 2 and 4 are adhesive layers, and 3 is a current collecting layer.

  In the current collector sheet of the present invention, an adhesive layer may be formed at a required location outside the insulating layer. In addition, the current collector sheet of the present invention may be configured to be sandwiched between the gas flow path plate used and the gas diffusion electrode.

Fuel cell A fuel cell has electrodes (gas diffusion electrodes) joined to both surfaces of an electrolyte membrane sheet.

  In the electrolyte membrane sheet, a catalyst layer called an anode electrode is formed on one surface of a hydrogen ion conductive polymer electrolyte membrane, and a catalyst layer called a cathode electrode is formed on the other surface of the electrolyte membrane.

  One embodiment of the electrolyte membrane sheet used in the present invention is shown in FIG. FIG. 5 is a cross-sectional view of the electrolyte membrane sheet used in the present invention. In FIG. 5, 10 is an electrolyte membrane, 20 is an anode electrode, and 30 is a cathode electrode.

  As the hydrogen ion conductive polymer electrolyte membrane, a polymer material having hydrogen ion conductivity can be widely used. For example, a perfluorocarbon sulfonic acid polymer in which the C—H bond of a hydrocarbon ion exchange membrane is substituted with fluorine ( PFS polymer) can be used. By introducing a fluorine atom having a high electronegativity, it is chemically very stable, a sulfonic acid group has a high degree of detachment, and high ionic conductivity can be realized.

Specific examples of the PFS polymer include, for example, a polymer unit based on tetrafluoroethylene, and at least one functional group selected from the group consisting of a sulfonic acid group (—SO ₃ H) and a carboxylic acid group (—COOH). Examples thereof include a copolymer containing a polymer unit based on perfluorovinyl ether having benzene.

  Preferred PFS-based polymers are Nafion manufactured by DuPont, Flemion manufactured by Asahi Glass Co., Ltd., and Aciplex manufactured by Asahi Kasei Co., Ltd.

  The catalyst layer can be either (1) applying the catalyst paste directly to the hydrogen ion conductive polymer electrolyte membrane, or (2) applying the catalyst paste on the plastic substrate and overlaying it on the hydrogen ion conductive polymer electrolyte membrane. In addition, it is formed by transferring the catalyst layer onto the hydrogen ion conductive electrolyte membrane.

  A wide variety of known catalyst pastes can be used as the catalyst paste for forming the catalyst layer. A typical catalyst paste includes platinum and, if necessary, carbon powder supporting at least one metal selected from the group consisting of ruthenium, palladium, rhodium, nickel, iridium and iron, and a hydrogen ion conductive polymer solution. And a binder (for example, alcohol) mixed and dispersed.

  When the direct coating method of (1) above is employed, an appropriate coating method can be employed as the coating method of the catalyst paste depending on the viscosity, solid content concentration, etc. of the catalyst paste. Examples of such a method include a method using a coating machine such as a knife coater, a bar coater, a dip coater, a spin coater, a roll coater, a die coater, and a curtain coater, a spray coating method, a screen printing method, and the like. be able to.

  When the transfer method (2) is adopted, first, a catalyst paste is applied on a plastic substrate. As an application method of the catalyst paste, an appropriate application method can be adopted according to the viscosity, solid content concentration, etc. of the catalyst paste. As such a method, for example, any of the coating methods exemplified in the direct coating method of (1) can be used.

  Examples of the plastic substrate used in the transfer method include polyimide, polyethylene terephthalate, polyparvanic acid aramid, polyamide (nylon), polysulfone, polyethersulfone, polyphenylene sulfide, polyether ether ketone, polyetherimide, polyarylate. , Polyethylene naphthalate, fluororesin (for example, ethylene tetrafluoroethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroperfluoroalkyl vinyl ether copolymer (PFA), polytetra Heat-resistant resins such as fluoroethylene (PTFE) and the like, and these are usually used in the form of a film or a sheet.

  The surface of the plastic substrate may be surface-treated with a fluorine-based or silicone-based release treatment agent, a release wax, or the like.

  The thickness of the plastic substrate is usually about 6 to 100 μm, preferably about 6 to 30 μm, and more preferably about 6 to 15 μm, from the viewpoints of handleability at the time of coating and peeling, economy, and the like.

  A preferred plastic substrate is inexpensive and readily available, specifically polyethylene terephthalate.

  The transfer of the catalyst layer onto the hydrogen ion conductive electrolyte membrane is performed, for example, by superposing and pressing the plastic substrate on which the catalyst layer is formed and the hydrogen ion conductive electrolyte membrane.

  The heating temperature is usually about 20 to 200 ° C., preferably about 100 to 180 ° C., and more preferably about 120 to 150 ° C. from the viewpoint of preventing breakage or modification of the electrolyte membrane and avoiding poor adhesion.

  The press pressure is usually about 0.5 to 20 Mpa, preferably about 3 to 15 Mpa, and more preferably about 5 to 10 Mpa from the viewpoint of preventing breakage or denaturation of the electrolyte membrane and avoiding poor adhesion.

  A fuel cell can be manufactured by joining electrodes (gas diffusion electrodes) to both surfaces of the electrolyte membrane sheet thus obtained.

  A fuel cell is also produced by applying the catalyst paste to a gas diffusion electrode, drying it to form a catalyst layer, and then superimposing and bonding with a hydrogen ion conductive polymer electrolyte membrane.

  As the gas diffusion electrode, for example, a sheet-like gas diffusion electrode such as carbon cloth or carbon paper can be preferably used. The thickness of the sheet-like gas diffusion electrode is usually about 50 to 400 μm, preferably about 100 to 200 μm.

  FIG. 6 is a cross-sectional view showing one embodiment of the fuel cell used in the present invention. In FIG. 6, 10 is an electrolyte membrane, 20 is an anode electrode, 30 is a cathode electrode, and 21 and 31 are gas diffusion electrodes.

Joining of Fuel Cell and Current Collector Sheet Joining of the current collector sheet and fuel cell of the present invention is performed by heat sealing or hot pressing.

  The conditions for heat sealing and hot pressing are not limited, but the pressure level is usually about 0.1 to 100 Mpa, preferably about 5 to 15 Mpa. The heating temperature is usually about 120 to 170 ° C, preferably about 130 to 150 ° C.

  In the joining in the present invention, a part of an electrode (gas diffusion electrode) that is an end portion of a fuel cell is overlapped with an exposed surface of a current collecting layer that is an end portion of a current collecting sheet, and adjacent fuel cells are connected in series. It arrange | positions so that it may connect to, and it is performed by arrange | positioning and heat-sealing or heat-pressing (FIG. 7).

  FIG. 7 is a view showing an example in which the current collector sheet of the present invention and a fuel cell are joined. In FIG. 7, A is a current collector sheet, and B is a fuel cell.

  If the current collection sheet | seat of this invention is used, two or more fuel battery cells can be connected efficiently and reliably.

  If the current collector sheet of the present invention is used, two or more fuel cells can be connected in a plane direction and in series.

  Since the connection between the fuel cells via the current collector sheet of the present invention is performed by heat sealing or hot pressing, the speed can be increased and mass production of miniaturized fuel cells is easy.

  By connecting the fuel cells in series via the current collector sheet of the present invention, a fuel cell capable of taking out a desired voltage can be manufactured.

  Since the opposite side of the current collecting sheet joined to the fuel cell is covered with the adhesive layer and the insulating layer, there is no possibility that the current collecting layer may be exposed.

  The present invention will be further clarified by the following examples.

Example 1
Production of current collector sheet A laminate of an insulating layer and an adhesive layer (that is, polyethylene terephthalate (PET, thickness 12 μm) serving as an insulating layer), acid-modified polyethylene resin (unsaturated carboxylic acid grafted polyethylene, thickness serving as an adhesive layer) Two rolls on which 20 μm) was wound were prepared. These rolls are called roll a and roll b. Moreover, the roll which wound up the seal | sticker shape what prepared the chemical conversion process (corrosion-proof process) on both surfaces of copper foil (20 micrometers) was prepared. This roll is referred to as roll c.

  Centering on roll c, roll a is slightly to the right in the flow direction, roll b is slightly to the left in the flow direction, and the adhesive layer side of the laminate of roll a and roll b faces the copper foil of roll c As described above, a roll a, a roll b, and a roll c were arranged, and heat seal lamination was performed to prepare a laminate of insulating layer / adhesive layer / current collecting layer / adhesive layer / insulating layer. Next, the laminate is cut in a direction perpendicular to the flow direction, thereby forming a layer of polyethylene terephthalate / acid-modified polyethylene resin / copper foil / acid-modified polyethylene resin / polyethylene terephthalate as shown in FIGS. A current collecting sheet having the structure was manufactured.

Example 2
Production of current collector sheet Implemented except that acid-modified polypropylene resin (unsaturated carboxylic acid grafted polypropylene, thickness 15 μm) is used instead of acid-modified polyethylene resin (unsaturated carboxylic acid grafted polyethylene, thickness 20 μm) as an adhesive layer In the same manner as in Example 1, a current collector sheet having a layer structure of polyethylene terephthalate / acid-modified polypropylene resin / copper foil / acid-modified polypropylene resin / polyethylene terephthalate was produced.

Example 3
Production of Electrolyte Membrane Sheet Ink (paste) for forming a cathode catalyst layer was prepared by using a platinum-supported catalyst (Pt: 30 wt%, Tanaka Kikinzoku Kogyo, TEC10V30E) 10 g, 5 wt% Nafion solution (manufactured by DuPont, solvent: 40 g of isopropanol and 40 g of isopropanol (manufactured by Wako Pure Chemical Industries, Ltd.) were prepared by mixing with stirring using a disperser.

  Ink (paste) for forming the anode catalyst layer was prepared by adding 10 g of a platinum-ruthenium supported catalyst (manufactured by Tanaka Kikinzoku Kogyo Co., Ltd., TEC66E50), 40 g of 5 wt% Nafion solution (manufactured by DuPont, solvent: isopropanol) and isopropanol (Wako Pure Chemical Industries, Ltd.) 40 g) was prepared by mixing with stirring using a disperser.

  Cathode catalyst layer prepared as above using a die coat on one side of a polyethylene terephthalate (PET) film (E3120, manufactured by Toyobo Co., Ltd., thickness 13 μm) so that the thickness of the cathode catalyst layer after drying is 30 μm. Ink for forming was applied. Moreover, the ink for anode catalyst layer preparation prepared above was apply | coated to one side of another PET film using die coating so that the film thickness after drying of an anode catalyst layer might be set to 30 micrometers.

  After the applied ink was dried at 80 ° C., the ink for forming the cathode catalyst layer was applied to one surface of the hydrogen ion conductive electrolyte membrane (Nafion 117 DuPont, film thickness 175 μm) at a temperature of 150 ° C. and a press thickness of 5 Mpa. The electrolyte membrane sheet is manufactured by transferring and transferring the ink for forming the anode catalyst layer to the other surface of the hydrogen ion conductive electrolyte membrane at a temperature of 150 ° C. and a press thickness of 5 Mpa, and then peeling the PET film. did.

Manufacture of fuel cells Carbon paper (TGP-H-090, manufactured by Toray Industries, Inc., thickness 275 μm) is placed on both sides of the electrolyte membrane sheet manufactured above as a gas diffusion electrode, and a catalyst layer is attached by hot press A sheet-like fuel cell was manufactured by bonding the electrolyte membrane and carbon paper.

Example 4
Production of Fuel Cell Two sheet-like fuel cells produced in Example 3 were prepared. The end of the current collector layer of the current collector sheet produced in Example 1 is in contact with the end of the anode catalyst layer of one fuel cell, and the end of the cathode catalyst layer of the other fuel cell, The current collector sheet is arranged so that the other end portion of the current collector layer of the current collector sheet is in contact, and the fuel cell and the current collector sheet are joined by hot pressing (temperature 150 ° C., press pressure 5 Mpa), A fuel cell was manufactured.

Example 5
Fuel Cell Production A fuel cell was produced in the same manner as in Example 4 except that the current collecting sheet produced in Example 2 was used.

Test example 1
A separator in which a fuel supply channel was formed was disposed so as to sandwich the fuel cell manufactured in Example 4 or Example 5, and was tightened with a bolt through an insulating layer to create an evaluation stack. Next, hydrogen gas was supplied to the anode electrode and air was supplied to the cathode electrode.

  The electromotive force of the fuel cell produced in Example 4 was 925 mV, and the electromotive force of the fuel cell produced in Example 5 was 930 mV.

FIG. 1 is a cross-sectional view showing an embodiment of the current collector sheet of the present invention. FIG. 2 is a plan view showing an embodiment of the current collector sheet of the present invention. FIG. 3 is a cross-sectional view showing an embodiment of the current collector sheet of the present invention. FIG. 4 is a plan view showing an embodiment of the current collector sheet of the present invention. FIG. 5 is a cross-sectional view showing an embodiment of the electrolyte membrane sheet used in the present invention. FIG. 6 is a cross-sectional view showing one embodiment of the fuel battery cell of the present invention. FIG. 7 is a view showing an example of joining the current collecting sheet and the fuel battery cell of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Insulating layer 2 ... Adhesive layer 3 ... Current collecting layer 4 ... Adhesive layer 5 ... Insulating layer 10 ... Electrolyte film 20 ... Anode electrode 30 ... Cathode electrode 21 ... Gas diffusion electrode 31 ... Gas diffusion electrode A ... Current collection sheet B ... Fuel cell

Claims (4)

It consists of two or more fuel cells in which gas diffusion electrodes are joined to both surfaces of an electrolyte membrane sheet laminated in the order of anode electrode / hydrogen ion conductive polymer electrolyte membrane / cathode electrode,
The anode side of the fuel cell and the cathode side of the fuel cell adjacent to the cell are electrically connected by a current collector sheet ,
The current collecting sheet has a layer structure in which an insulating layer / adhesive layer / current collecting layer / adhesive layer / insulating layer are laminated in this order.
A polymer electrolyte fuel cell in which the insulating layer is a plastic film and the adhesive layer is made of a thermoplastic resin .   The fuel cell according to claim 1, wherein adjacent fuel cells are separated from each other by a current collecting sheet. The fuel cell according to claim 1, wherein the plastic film is a polyethylene terephthalate film or a polyamide film, and the thermoplastic resin is a polyolefin resin. It consists of two or more fuel cells in which gas diffusion electrodes are joined to both surfaces of an electrolyte membrane sheet laminated in the order of anode electrode / hydrogen ion conductive polymer electrolyte membrane / cathode electrode,
The anode side of the fuel cell and the cathode side of the fuel cell adjacent to the cell are electrically connected by a current collector sheet ,
The current collecting sheet has a layer structure in which an insulating layer / adhesive layer / current collecting layer / adhesive layer / insulating layer are laminated in this order.
The insulating layer is a plastic film, and the adhesive layer is a method for producing a polymer electrolyte fuel cell composed of a thermoplastic resin ,
Production of a polymer electrolyte fuel cell comprising a step of heat-sealing or hot-pressing the end of the anode of the fuel cell and the end of the cathode of the fuel cell adjacent to the cell via a current collector sheet Method.

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