JP2016048627A - Fuel battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and satisfactorily form and economically manufacture a separator.SOLUTION: A fuel battery 10 comprises: power generation units 12 each having a first separator 14, a first frame-attached electrolyte film-electrode structure 16a, a second separator 18, a second frame-attached electrolyte film-electrode structure 16b, and a third separator 20. The first frame-attached electrolyte film-electrode structure 16a has an outer peripheral edge with which a first resin frame member 60a and a first film member 62a are integrally molded. The first separator 14 includes a first film coating layer 46 composed of an insulative film on a face abutting against the first film member 62a.SELECTED DRAWING: Figure 2

Description

  The present invention provides a framed electrolyte membrane / electrode structure in which a resin frame member and a film member are sequentially provided on the outer periphery of an electrolyte membrane / electrode structure in which electrodes are provided on both sides of the electrolyte membrane. The present invention relates to a fuel cell in which separators are stacked.

  For example, a solid polymer fuel cell has a solid polymer electrolyte membrane made of a polymer ion exchange membrane. An electrolyte membrane / electrode structure (MEA) in which an anode electrode is provided on one side of the solid polymer electrolyte membrane and a cathode electrode is provided on the other side of the solid polymer electrolyte membrane is provided. The electrolyte membrane / electrode structure is sandwiched between separators to constitute a power generation cell (unit cell). A fuel cell is usually used as an in-vehicle fuel cell stack in which several tens to several hundreds of power generation cells are stacked.

  A fuel cell may employ a configuration in which a seal member is integrated with the outer periphery of an electrolyte membrane / electrode structure. This is because it becomes possible to suppress leakage of fuel gas and oxidant gas, or cross-leakage of these.

  For example, in the fuel cell disclosed in Patent Document 1, a seal member is provided on the outer peripheral portion of the electrolyte membrane / electrode structure, and a lip portion is provided on the seal member. This lip portion is in close contact with the surface of the separator.

JP 2009-104922 A

  By the way, in said patent document 1, in order to form a reaction gas flow path in a separator, the said separator is comprised with three plates. For this reason, there is a problem that the structure of the separator becomes complicated and the number of plates increases, which is not economical.

  The present invention solves this type of problem, and an object of the present invention is to provide a fuel cell that can easily and satisfactorily constitute a separator and can be manufactured economically.

  The fuel cell according to the present invention includes a framed electrolyte membrane, in which a resin frame member and a film member are sequentially provided on the outer periphery of an electrolyte membrane / electrode structure in which electrodes are provided on both sides of the electrolyte membrane. The electrode structure and the separator are stacked. And the separator is equipped with the film coating layer by an insulating film at least in the contact surface with a film member.

  Further, in this fuel cell, it is preferable that a cooling medium flow path for allowing the cooling medium to flow along the separator surface is formed between adjacent separators. In that case, it is preferable that the one separator which comprises a cooling-medium flow path is integrated with the sealing member which contacts the film coating layer provided in the other separator which comprises the said cooling-medium flow path.

  According to the present invention, a reaction gas passage portion for allowing a reaction gas to flow through the reaction gas channel can be formed in the resin frame member integrated with the electrolyte membrane / electrode structure. For this reason, the separator only needs to be provided with a film coating layer while performing minimum processing including the reaction gas flow path. Therefore, the manufacturing process of the separator is simplified at once, and the separator can be manufactured easily and satisfactorily. Thereby, the manufacturing cost of the whole fuel cell is reduced, and the fuel cell can be manufactured economically.

It is a principal part disassembled perspective explanatory drawing of the electric power generation unit which comprises the fuel cell concerning embodiment of this invention. FIG. 2 is a cross-sectional explanatory view taken along the line II-II in FIG. 1 of the power generation unit. FIG. 3 is a cross-sectional explanatory view taken along line III-III in FIG. 1 of the power generation unit. FIG. 4 is a cross-sectional explanatory view taken along line IV-IV in FIG. 1 of the power generation unit. FIG. 5 is a cross-sectional explanatory view taken along line VV in FIG. 1 of the power generation unit. It is front explanatory drawing of the 1st separator which comprises the said electric power generation unit. It is front explanatory drawing of the 2nd separator which comprises the said electric power generation unit. It is front explanatory drawing of the 3rd separator which comprises the said electric power generation unit. It is explanatory drawing of one surface of the electrolyte membrane and electrode structure with a 1st frame which comprises the said electric power generation unit. It is explanatory drawing of the other surface of the said electrolyte membrane and electrode structure with a 1st frame. It is explanatory drawing of one surface of the electrolyte membrane and electrode structure with a 2nd frame which comprises the said electric power generation unit. It is explanatory drawing of the other surface of the electrolyte membrane and electrode structure with a said 2nd frame.

  As shown in FIGS. 1 to 5, the fuel cell 10 according to the embodiment of the present invention includes a power generation unit 12. The plurality of power generation units 12 are stacked on each other along the horizontal direction (arrow A direction) or the vertical direction (arrow C direction), thereby constituting, for example, a fuel cell stack mounted on a fuel cell electric vehicle.

  The power generation unit 12 includes a first separator 14, a first framed electrolyte membrane / electrode structure 16 a, a second separator 18, a second framed electrolyte membrane / electrode structure 16 b, and a third separator 20.

  The 1st separator 14, the 2nd separator 18, and the 3rd separator 20 are comprised by the horizontally long metal plate which gave the surface treatment for anticorrosion to the metal surface, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate. Is done. The first separator 14, the second separator 18, and the third separator 20 have a rectangular planar shape, and are formed into a concavo-convex shape by pressing a metal thin plate into a wave shape. The first separator 14, the second separator 18, and the third separator 20 may be carbon separators instead of metal separators.

  As shown in FIG. 1, at one edge of the long side direction (arrow B direction) of the power generation unit 12, there is an oxidant gas inlet communication hole 22a and a fuel gas outlet communication hole 24b communicating with each other in the arrow A direction. Provided. The oxidant gas inlet communication hole 22a supplies an oxidant gas, for example, an oxygen-containing gas, while the fuel gas outlet communication hole 24b discharges a fuel gas, for example, a hydrogen-containing gas.

  The other end edge of the power generation unit 12 in the long side direction (arrow B direction) communicates with each other in the arrow A direction, and discharges the fuel gas inlet communication hole 24a for supplying fuel gas and the oxidant gas. For this purpose, an oxidant gas outlet communication hole 22b is provided.

  A pair of upper and lower cooling medium inlets that are close to the oxidant gas inlet communication hole 22a side at both ends in the short side direction (arrow C direction) of the power generation unit 12 and supply the cooling medium in communication with each other in the arrow A direction. A communication hole 26a is provided. A pair of upper and lower cooling medium outlet communication holes 26b for discharging the cooling medium is provided near both ends of the power generation unit 12 in the short side direction (arrow C direction) close to the fuel gas inlet communication hole 24a side.

  As shown in FIG. 6, the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 16a with the first frame communicates with the oxidant gas inlet communication hole 22a and the oxidant gas outlet communication hole 22b. A monooxidant gas flow path 28 is formed. The first oxidant gas channel 28 has a plurality of wave-like channel grooves (may be linear channel grooves) 28 a extending in the direction of arrow B.

  A plurality of inlet connection grooves 30a are formed in the vicinity of the oxidant gas inlet communication hole 22a. A plurality of outlet connection grooves 30b are formed in the vicinity of the oxidizing gas outlet communication hole 22b.

  As shown in FIG. 1, a part of the cooling medium flow path 32 that connects the pair of upper and lower cooling medium inlet communication holes 26 a and the pair of upper and lower cooling medium outlet communication holes 26 b is formed on the surface 14 b of the first separator 14. Is done. In the cooling medium flow path 32, the back surface of the first separator 14 in which the first oxidant gas flow path 28 is formed overlaps the back surface of the third separator 20 in which a second fuel gas flow path 42 described later is formed. Formed.

  A first fuel gas flow path 34 that connects the fuel gas inlet communication hole 24a and the fuel gas outlet communication hole 24b is formed on the surface 18a of the second separator 18 facing the electrolyte membrane / electrode structure 16a with the first frame. The The first fuel gas channel 34 has a plurality of wave-like channel grooves (or linear channel grooves) 34 a extending in the direction of arrow B.

  A plurality of supply holes 36a are formed in the vicinity of the fuel gas inlet communication hole 24a. A plurality of discharge holes 36b are formed in the vicinity of the fuel gas outlet communication hole 24b.

  As shown in FIG. 7, the oxidant gas inlet communication hole 22a and the oxidant gas outlet communication hole 22b communicate with the surface 18b of the second separator 18 facing the electrolyte membrane / electrode structure 16b with the second frame. A dioxidant gas flow path 38 is formed. The second oxidizing gas channel 38 has a plurality of wave-shaped channel grooves (or linear channel grooves) 38 a extending in the direction of arrow B.

  A plurality of inlet connection grooves 40a are formed in the vicinity of the oxidant gas inlet communication hole 22a. A plurality of outlet connection grooves 40b are formed in the vicinity of the oxidant gas outlet communication hole 22b.

  As shown in FIG. 1, the second fuel gas communicating with the fuel gas inlet communication hole 24a and the fuel gas outlet communication hole 24b is formed on the surface 20a of the third separator 20 facing the electrolyte membrane / electrode structure 16b with the second frame. A flow path 42 is formed. The second fuel gas passage 42 has a plurality of wave-like passage grooves (may be straight passage grooves) 42 a extending in the direction of arrow B.

  A plurality of supply holes 44a are formed in the vicinity of the fuel gas inlet communication hole 24a. A plurality of discharge hole portions 44b are formed in the vicinity of the fuel gas outlet communication hole 24b. The supply hole 44a is offset inward (power generation surface side) from the supply hole 36a along the stacking direction, and the discharge hole 44b is inward of the discharge hole 36b along the stacking direction. It is offset.

  As shown in FIGS. 2 to 5, the first film covering layer 46 is integrally formed on the surfaces 14 a and 14 b of the first separator 14 around the outer peripheral edge of the first separator 14. A second film coating layer 48 is integrally formed on the surfaces 18 a and 18 b of the second separator 18 around the outer peripheral edge of the second separator 18. A third film coating layer 50 is integrally formed on the surface 20 a of the third separator 20 around the outer peripheral edge of the third separator 20.

  The 1st film coating layer 46, the 2nd film coating layer 48, and the 3rd film coating layer 50 are comprised by integrating the insulating film which has uniform thickness along a separator surface.

  As shown in FIGS. 2 and 8, the seal member 52 is provided on the surface 20 b of the third separator 20 without providing the third film coating layer 50 (or with the third film coating layer 50 provided). Integrated. The seal member 52 circulates around the cooling medium inlet communication hole 26a, the cooling medium outlet communication hole 26b, and the cooling medium flow path 32 to communicate these. The seal member 52 has a flat seal portion 52f extending with a uniform thickness along the surface 20b, and the inner seal portion 52a and the outer seal portion 52b bulge integrally from the flat seal portion 52f. It is formed.

  As the sealing member 52, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or other sealing material, cushioning material, packing material, etc. The sealing material which has is used.

  As shown in FIGS. 2 to 5, the first framed electrolyte membrane / electrode structure 16a and the second framed electrolyte membrane / electrode structure 16b are, for example, solids in which a perfluorosulfonic acid thin film is impregnated with water. A polymer electrolyte membrane (cation exchange membrane) 54 is provided. The solid polymer electrolyte membrane 54 is sandwiched between a cathode electrode 56 and an anode electrode 58 to constitute an electrolyte membrane / electrode structure 59.

  The cathode electrode 56 constitutes a so-called step MEA having a plane dimension smaller than that of the anode electrode 58 and the solid polymer electrolyte membrane 54. The anode electrode 58 may have a plane size smaller than the plane size of the cathode electrode 56 and the solid polymer electrolyte membrane 54.

  The cathode electrode 56 and the anode electrode 58 are formed by uniformly applying a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the gas diffusion layer. And an electrode catalyst layer (not shown) to be formed. The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 54.

  As shown in FIGS. 1 to 5, the first framed electrolyte membrane / electrode structure 16 a is located outside the terminal portion of the cathode electrode 56, and the first resin is disposed on the outer peripheral edge of the solid polymer electrolyte membrane 54. A frame member 60a is provided. The first resin frame member 60a includes, for example, PPS (polyphenylene sulfide), PPA (polyphthalamide), PEN (polyethylene naphthalate), PES (polyethersulfone), LCP (liquid crystal polymer), PVDF (polyvinylidene fluoride). ), Silicone rubber, fluorine rubber or EPDM (ethylene propylene rubber).

  As shown in FIG. 2, a frame-shaped first film member 62a is bonded to the outer peripheral edge 60ae of the first resin frame member 60a via an adhesive layer 63a. The first film member 62a is made of the same material as the first resin frame member 60a, for example. A first resin frame member 60a and a first film member 62a are sequentially provided on the outer periphery of the electrolyte membrane / electrode structure 59 toward the outside.

  The outer peripheral edge 60ae of the first resin frame member 60a is formed in a thin shape over a predetermined width dimension (a dimension inward from the outer peripheral end). The inner peripheral edge 62ae of the first film member 62a is formed in a thin shape over a predetermined width dimension (a dimension inward from the inner peripheral edge). An adhesive layer 63a is formed by applying an adhesive in a frame shape to an overlapping portion between the outer peripheral edge portion 60ae of the first resin frame member 60a and the inner peripheral edge portion 62ae of the first film member 62a.

  As shown in FIGS. 1 to 5, the second membrane-attached electrolyte membrane / electrode structure 16 b is located outside the terminal portion of the cathode electrode 56, and the second resin is placed on the outer peripheral edge of the solid polymer electrolyte membrane 54. A frame member 60b is provided. The second resin frame member 60b is configured in the same manner as the first resin frame member 60a.

  As shown in FIG. 2, a frame-shaped second film member 62b is joined to the outer peripheral edge 60be of the second resin frame member 60b via an adhesive layer 63b. The second film member 62b is made of the same material as the second resin frame member 60b, for example. An adhesive layer 63b is formed by applying an adhesive in a frame shape to an overlapping portion between the outer peripheral edge portion 60be of the second resin frame member 60b and the inner peripheral edge portion 62be of the second film member 62b.

  As shown in FIGS. 1 and 9, an inlet buffer portion 66a having a plurality of embossed portions 64a is provided in the vicinity of the oxidizing gas inlet communication hole 22a on the surface of the first resin frame member 60a on the cathode electrode 56 side. It is done. A plurality of line-shaped guide passages 68a are provided between the inlet buffer portion 66a and the first oxidant gas flow path 28. In the vicinity of the oxidant gas outlet communication hole 22b, an outlet buffer part 66b having a plurality of embossed parts 64b is provided. A plurality of line-shaped guide passages 68b are provided between the outlet buffer portion 66b and the first oxidant gas flow path 28.

  As shown in FIGS. 2, 6 and 9, the first film coating layer 46 provided on the surface 14a of the first separator 14 and the first film provided on the electrolyte membrane / electrode structure 16a with the first frame. The member 62a is joined (adhered or heat welded) to each other. Between the first film covering layer 46 and the first film member 62a, the oxidant gas inlet communication hole 22a, the oxidant gas outlet communication hole 22b, and the first oxidant gas flow path 28 are circulated and communicate with each other. .

  As shown in FIGS. 2 and 10, an inlet buffer portion 72a having a plurality of embossed portions 70a is provided in the vicinity of the fuel gas inlet communication hole 24a on the surface of the first resin frame member 60a on the anode electrode 58 side. . A plurality of line-shaped guide passages 74 a are provided between the inlet buffer portion 72 a and the first fuel gas flow path 34. In the vicinity of the fuel gas outlet communication hole 24b, an outlet buffer portion 72b having a plurality of embossed portions 70b is provided. A plurality of line-shaped guide passages 74 b are provided between the outlet buffer portion 72 b and the first fuel gas flow path 34.

  As shown in FIGS. 1, 2 and 10, the second film coating layer 48 provided on the surface 18a of the second separator 18 and the first film provided on the electrolyte membrane / electrode structure 16a with the first frame. The member 62a is joined (adhered or heat welded) to each other. Between the second film coating layer 48 and the first film member 62a, the fuel gas inlet communication hole 24a, the fuel gas outlet communication hole 24b, and the first fuel gas flow path 34 are circulated and communicate with each other.

  As shown in FIGS. 1 and 11, an inlet buffer portion 78a having a plurality of embossed portions 76a is provided in the vicinity of the oxidant gas inlet communication hole 22a on the surface of the second resin frame member 60b on the cathode electrode 56 side. It is done. A plurality of line-shaped guide passages 80a are provided between the inlet buffer portion 78a and the second oxidant gas flow path 38. In the vicinity of the oxidant gas outlet communication hole 22b, an outlet buffer part 78b having a plurality of embossed parts 76b is provided. A plurality of line-shaped guide passages 80b are provided between the outlet buffer portion 78b and the second oxidant gas flow path 38.

  As shown in FIGS. 2 and 11, the second film covering layer 48 provided on the surface 18b of the second separator 18, and the second film member 62b provided on the second framed electrolyte membrane / electrode structure 16b, Are joined (adhered or heat welded) to each other. Between the second film coating layer 48 and the second film member 62b, the oxidant gas inlet communication hole 22a, the oxidant gas outlet communication hole 22b, and the second oxidant gas flow path 38 circulate, and these communicate with each other. .

  As shown in FIGS. 2 and 12, an inlet buffer portion 84a having a plurality of embossed portions 82a is provided in the vicinity of the fuel gas inlet communication hole 24a on the surface of the second resin frame member 60b on the anode electrode 58 side. . A plurality of line-shaped guide passages 86a are provided between the inlet buffer portion 84a and the second fuel gas passage 42. An outlet buffer portion 84b having a plurality of embossed portions 82b is provided in the vicinity of the fuel gas outlet communication hole 24b. A plurality of line-shaped guide passages 86b are provided between the outlet buffer portion 84b and the second fuel gas passage 42.

  As shown in FIGS. 1, 2 and 12, the third film coating layer 50 provided on the surface 20a of the third separator 20 and the second film provided on the electrolyte membrane / electrode structure 16b with the second frame. The member 62b is joined (adhered or heat welded) to each other. Between the third film covering layer 50 and the second film member 62b, the fuel gas inlet communication hole 24a, the fuel gas outlet communication hole 24b, and the second fuel gas flow path 42 are circulated and communicate with each other.

  When the power generation units 12 are stacked on each other, a cooling medium flow path 32 is provided between the first separator 14 constituting one power generation unit 12 and the third separator 20 constituting the other power generation unit 12. It is formed.

  The operation of the fuel cell 10 configured as described above will be described below.

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 22a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 24a. Supplied. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the pair of upper and lower cooling medium inlet communication holes 26a.

  For this reason, as shown in FIGS. 1 and 4, the oxidant gas flows from the oxidant gas inlet communication hole 22a through the inlet buffer portion 66a and the line-shaped guide passage 68a to the first oxidant gas flow of the first separator 14. Supplied to the path 28. The remaining oxidant gas is introduced from the oxidant gas inlet communication hole 22a into the second oxidant gas flow path 38 of the second separator 18 through the inlet buffer portion 78a and the line-shaped guide passage 80a.

  As shown in FIG. 1, the oxidant gas moves in the direction of arrow B (horizontal direction) along the first oxidant gas flow path 28, and reaches the cathode electrode 56 of the electrolyte membrane / electrode structure 16 a with the first frame. Supplied. The remaining oxidant gas moves in the direction of arrow B along the second oxidant gas flow path 38 and is supplied to the cathode electrode 56 of the electrolyte membrane / electrode structure 16b with the second frame.

  On the other hand, as shown in FIG. 3, the fuel gas is supplied from the fuel gas inlet communication hole 24a through the supply hole 36a of the second separator 18 to the inlet buffer 72a. The fuel gas is supplied to the first fuel gas flow path 34 of the second separator 18 through the inlet buffer portion 72a and the line-shaped guide passage 74a.

  The remaining fuel gas is supplied from the fuel gas inlet communication hole 24a to the inlet buffer part 84a through the supply hole part 44a of the third separator 20. The fuel gas is supplied to the second fuel gas flow path 42 of the third separator 20 through the inlet buffer portion 84a and the line-shaped guide passage 86a.

  As shown in FIG. 1, the fuel gas moves in the direction of arrow B along the first fuel gas flow path 34 and is supplied to the anode electrode 58 of the electrolyte membrane / electrode structure 16 a with the first frame. The remaining fuel gas moves in the direction of arrow B along the second fuel gas channel 42 and is supplied to the anode electrode 58 of the electrolyte membrane / electrode structure 16b with the second frame.

  Accordingly, in the electrolyte membrane / electrode structure 16a with the first frame and the electrolyte membrane / electrode structure 16b with the second frame, the oxidant gas supplied to each cathode electrode 56 and the fuel gas supplied to each anode electrode 58 Is consumed by an electrochemical reaction in the electrode catalyst layer to generate electricity.

  Next, the oxidant gas consumed by being supplied to the cathode electrodes 56 of the first framed electrolyte membrane / electrode structure 16a and the second framed electrolyte membrane / electrode structure 16b is shown in FIGS. Then, the gas is discharged from the line-shaped guide passages 68b and 80b through the outlet buffer portions 66b and 78b to the oxidant gas outlet communication hole 22b.

  The fuel gas consumed by being supplied to the anode electrode 58 of the electrolyte membrane / electrode structure 16a with the first frame and the electrolyte membrane / electrode structure 16b with the second frame, as shown in FIGS. It is introduced into the outlet buffer portions 72b and 84b from the guide passages 74b and 86b. As shown in FIG. 1, the fuel gas is discharged to the fuel gas outlet communication hole 24b through the discharge holes 36b and 44b.

  On the other hand, the cooling medium supplied to the pair of upper and lower cooling medium inlet communication holes 26a is introduced into the cooling medium flow path 32 as shown in FIG. The cooling medium once flows in the direction of arrow C and then moves in the direction of arrow B to cool the first framed electrolyte membrane / electrode structure 16a and the second framed electrolyte membrane / electrode structure 16b. To do. This cooling medium moves outward in the direction of arrow C, and is then discharged into a pair of upper and lower cooling medium outlet communication holes 26b.

  In this case, in the present embodiment, for example, in the electrolyte membrane / electrode structure 16a with the first frame, the first resin frame member 60a is integrated with the outer periphery of the step MEA, and the first resin frame member 60a A first film member 62a is bonded to the outer peripheral edge 60ae.

  As shown in FIG. 9, the first resin frame member 60a includes an inlet buffer 66a, which is a reaction gas passage, between the oxidant gas inlet communication hole 22a and the first oxidant gas flow path 28. A line-shaped guide passage 68a is provided. On the other hand, between the oxidant gas outlet communication hole 22 b and the first oxidant gas flow path 28, an outlet buffer part 66 b that is a reaction gas passage part and a line-shaped guide path 68 b are provided.

  For this reason, the first separator 14 need only be provided with the first film coating layer 46 while performing the minimum processing (press processing) including the first oxidant gas flow path 28. Therefore, the manufacturing operation of the first separator 14 is simplified at a stroke, and the first separator 14 can be manufactured easily and satisfactorily.

  The same applies to the second separator 18. On the other hand, in the third separator 20, the sealing member 52 is integrally formed on the surface 20 b with minimum processing. Thereby, the manufacturing cost of the whole fuel cell 10 is reduced, and the effect that the fuel cell 10 can be manufactured economically is obtained.

  Further, as shown in FIG. 2, the first separator 14 includes a first film covering layer 46 that is in direct contact with at least the first film member 62 a of the electrolyte membrane / electrode structure 16 a with the first frame. On the other hand, the second separator 18 directly contacts the first film member 62a of the electrolyte membrane / electrode structure 16a with the first frame and the second film member 62b of the electrolyte membrane / electrode structure 16b with the second frame. The second film covering layer 48 is provided. For this reason, it is possible to reliably suppress the leakage of the fuel gas and the oxidant gas with a simple configuration.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell 12 ... Power generation unit 14, 18, 20 ... Separator 16a, 16b ... Electrolyte membrane electrode assembly 22a with frame ... Oxidant gas inlet communication hole 22b ... Oxidant gas outlet communication hole 24a ... Fuel gas inlet communication hole 24b ... Fuel gas outlet communication hole 26a ... Cooling medium inlet communication hole 26b ... Cooling medium outlet communication hole 28, 38 ... Oxidant gas flow path 32 ... Cooling medium flow path 34, 42 ... Fuel gas flow path 46, 48, 50 ... Film covering layer 52 ... Sealing member 54 ... Solid polymer electrolyte membrane 56 ... Cathode electrode 58 ... Anode electrode 59 ... Electrolyte membrane / electrode structure 60a, 60b ... Resin frame members 62a, 62b ... Film members 63a, 63b ... Adhesive layer 66a, 72a, 78a, 84a ... Inlet buffer portions 66b, 72b, 78b, 84b ... Outlet buffer portions 68a, 68b, 74a, 7 4b, 80a, 80b, 86a, 86b ... Line-shaped guide passage

Claims (2)

On the outer periphery of the electrolyte membrane / electrode structure in which electrodes are provided on both sides of the electrolyte membrane, a resin frame member and a film member are sequentially provided on the outer periphery, and the electrolyte membrane / electrode structure with frame and the separator are sequentially provided. A stacked fuel cell,
The fuel cell according to claim 1, wherein the separator includes a film coating layer made of an insulating film on at least a contact surface with the film member. 2. The fuel cell according to claim 1, wherein a cooling medium flow path for flowing the cooling medium along the separator surface is formed between the separators adjacent to each other.
A fuel is characterized in that one separator constituting the cooling medium flow path is integrated with a seal member that directly contacts the film coating layer provided on the other separator constituting the cooling medium flow path. battery.

Images