WO2017104212A1 - 燃料電池スタックのシール構造及びその製造方法 - Google Patents
燃料電池スタックのシール構造及びその製造方法 Download PDFInfo
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- WO2017104212A1 WO2017104212A1 PCT/JP2016/078243 JP2016078243W WO2017104212A1 WO 2017104212 A1 WO2017104212 A1 WO 2017104212A1 JP 2016078243 W JP2016078243 W JP 2016078243W WO 2017104212 A1 WO2017104212 A1 WO 2017104212A1
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- outer peripheral
- seal member
- fuel cell
- inner peripheral
- peripheral seal
- 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
- H01M8/0276—Sealing means characterised by their form
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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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
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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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
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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
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
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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
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
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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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a seal structure of a fuel cell stack and a manufacturing method thereof.
- An object of the present invention is to provide a seal structure for a fuel cell stack and a method for manufacturing the same, which can realize an appropriate seal with a seal member even when the interval between single fuel cell cells is small.
- the inventors of the present invention made extensive studies to achieve the above object. As a result, a first closed space is formed between the inner peripheral seal member and the outer peripheral seal member disposed at a predetermined position, and a cutout portion is formed in the outer peripheral seal member for communicating the first closed space with the outside. Thus, the inventors have found that the above object can be achieved, and have completed the present invention.
- the fuel cell stack sealing structure of the present invention includes a fuel cell stack formed by laminating a plurality of fuel cell single cells having a membrane electrode assembly and a pair of separators sandwiching the membrane electrode assembly. And an outer peripheral seal member. At least one separator of the pair of separators has an inner peripheral rib that protrudes to at least the facing surface side of the pair of separators at the peripheral portion of the separator. At least one separator of the pair of separators has an outer peripheral rib that protrudes at least on the opposed surface side of the pair of separators on the outer peripheral side of the inner peripheral rib.
- the inner peripheral sealing member closes between the inner peripheral ribs of the pair of separators constituting the fuel cell single cell.
- the outer peripheral seal member is disposed on the outer peripheral side of the inner peripheral seal member and closes between the outer peripheral ribs of the pair of separators.
- the inner peripheral seal member and the outer peripheral seal member form a first closed space between the inner peripheral seal member and the outer peripheral seal member.
- the outer peripheral seal member has a notch for communicating the first closed space with the outside.
- the fuel cell stack sealing structure manufacturing method of the present invention is a method of manufacturing the fuel cell stack sealing structure of the present invention, and includes the following steps (1) to (3).
- step (1) when the membrane electrode assembly is sandwiched between the pair of separators, at least one inner circumference of the pair of separators is formed so as to form an inner circumference sealing member that closes between the inner circumferential ribs of the pair of separators.
- a laminated structure is produced by applying an inner peripheral seal member material forming an inner peripheral seal member to the rib.
- step (2) executed after step (1), a notch portion forming member for forming a notch portion on the side surface of the laminated structure is disposed.
- the outer peripheral seal member material forming the outer peripheral seal member is filled so as to form the outer peripheral seal member, the first closed space, and the notch.
- the first closed space is formed between the inner peripheral seal member and the outer peripheral seal member disposed at a predetermined position, and the notch portion that allows the outer peripheral seal member to communicate the first closed space and the outside. Therefore, damage to the inner peripheral seal member when the outer peripheral seal member is disposed can be suppressed. As a result, it is possible to provide a fuel cell stack sealing structure and a method for manufacturing the fuel cell stack that can realize appropriate sealing by the sealing member even when the interval between the fuel cell single cells is small.
- FIG. 1 is a perspective view illustrating a fuel cell stack according to the first embodiment of the present invention.
- FIG. 2 is an exploded perspective view illustrating the fuel cell stack according to the first embodiment of the present invention.
- FIG. 3 is a perspective view showing the fuel cell module according to the first embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view taken along line IV-IV of the fuel cell module shown in FIG.
- FIG. 7 is a schematic cross-sectional view showing some examples of the seal structure of the fuel cell stack.
- FIG. 1 is a perspective view illustrating a fuel cell stack according to the first embodiment of the present invention.
- FIG. 2 is an exploded perspective view illustrating the fuel cell stack according to the first embodiment of the present invention.
- FIG. 3 is a perspective view showing the fuel
- FIG. 8 is a schematic cross-sectional view showing a modification of the shape of the outer peripheral rib.
- FIG. 9 is a schematic cross-sectional view taken along line IV-IV of the fuel cell module shown in FIG.
- FIG. 10A is a perspective view showing a fuel cell module according to the second embodiment of the present invention, and FIG. 10B is surrounded by a B line of the fuel cell module shown in FIG.
- FIG. 11 is a perspective view showing a fuel cell module according to the third embodiment of the present invention.
- FIG. 12A is a perspective view showing a fuel cell module according to the fourth embodiment of the present invention, and FIG. 12B is surrounded by a B line of the fuel cell module shown in FIG. FIG. FIG.
- FIG. 13A is a schematic cross-sectional view showing the laminated structure before inserting the jig
- FIG. 13B is a schematic cross-sectional view showing the laminated structure after inserting the jig.
- 14A is a cross-sectional view showing a state before an example of the notch forming member is inserted into the laminated structure
- FIG. 14B is an example of inserting the example of the notch forming member into the laminated structure. It is sectional drawing which shows a back state.
- FIG. 15A is a perspective view showing a main part in a state before insertion of another example of the notch forming member into the laminated structure
- FIG. 15B shows another example of the notch forming member.
- FIG. 16A is a perspective view showing a main part in a state before inserting another example of the notch forming member into the laminated structure
- FIG. 16B shows still another example of the notch forming member. It is a perspective view which shows the principal part of the state after inserting an example into a laminated structure.
- PEFC polymer electrolyte fuel cell
- FIG. 1 is a perspective view illustrating a fuel cell stack according to a first embodiment of the present invention.
- FIG. 2 is an exploded perspective view illustrating the fuel cell stack according to the first embodiment of the present invention.
- FIG. 3 is a perspective view showing the fuel cell module according to the first embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view taken along line IV-IV of the fuel cell module shown in FIG.
- FIG. 5 is a schematic cross-sectional view taken along line VV of the fuel cell module shown in FIG.
- FIG. 6 is a schematic cross-sectional view taken along line VI-VI of the fuel cell module shown in FIG.
- the fuel cell stack FS of the present embodiment includes a plurality of fuel cell modules M in which a plurality of fuel cell single cells C are stacked and integrated, and a fuel cell module M interposed therebetween. And a seal plate P to be mounted.
- the fuel cell single cell C and the seal plate P in the illustrated example both have a rectangular plate shape having substantially the same vertical and horizontal dimensions.
- two fuel cell modules M and one seal plate P are shown, but actually, more fuel cell modules M and seal plates P are stacked.
- the fuel cell stack FS has end plates 56A and 56B disposed at both ends in the stacking direction of the fuel cell module M, respectively, and both surfaces on the long side of the single fuel cell C (in FIGS. 1 and 2).
- Fastening plates 57A and 57B are provided on the upper and lower surfaces, and reinforcing plates 58A and 58B are provided on both surfaces on the short side.
- the fastening plates 57A and 57B and the reinforcing plates 58A and 58B are connected to both end plates 56A and 56B by bolts (not shown).
- the fuel cell stack FS has a case-integrated structure as shown in FIG. 1, and each fuel cell module M and the seal plate P are constrained and pressurized in the stacking direction so that each fuel cell single cell C is predetermined.
- Each fuel cell module M has a notch (not shown), which will be described in detail later, on one surface (the lower surface in FIGS. 1 and 2) on the long side of the fuel cell module M. Yes.
- one fastening plate 57B on the lower side in FIGS. 1 and 2 has a slit 57s in which the notch is exposed.
- the fuel cell module M of the present embodiment has a structure in which a plurality of fuel cell single cells C are stacked. Further, the fuel cell module M has a seal plate P on the upper surface and an outer peripheral seal member 4 (4B) having a notch portion n, which will be described in detail later, on the side surface.
- FIG. 3 a fuel cell module M in which 20 fuel cell single cells C are stacked is shown.
- FIG. 4 and FIG. 5 for convenience, a fuel cell module M in which five fuel cell single cells C are stacked is shown.
- the quantity of the fuel cell single cells C to be stacked is not particularly limited. For example, when a plurality of fuel cell single cells C are stacked and connected in series, the number of fuel cell single cells C to be stacked can be appropriately set according to the required performance.
- the separator 2 constituting the seal plate P and the single fuel cell C has three manifold holes H1 to H3 and H4 to H6 at both ends on the short side.
- the manifold holes H3 and H4 function as anode gas supply and discharge, respectively
- the manifold holes H6 and H1 function as cathode gas supply and discharge, respectively
- the manifold holes H2 and H5 are water. It functions as the supply and discharge of the cooling medium.
- the fuel cell module M also has a similar seal plate P on the lower surface (see FIGS. 4 and 5). Moreover, these seal plates P are joined to the separator 2 by the fourth seal member 6 (see FIGS. 4 and 5). Furthermore, although not particularly limited, for example, a metal plate such as stainless steel can be used as the seal plate.
- the outer peripheral seal member 4 (4B), which will be described in detail later, has a frame-shaped notch forming member 5A at the notch n.
- the cutout forming member 5A is not particularly limited as long as electrical insulation can be ensured between the separators 2.
- a notch forming member 5A for example, a resin-made member can be applied.
- the notch forming member 5A may be made of a material similar to or the same material as the outer peripheral seal member material or the outer peripheral seal member material, or a material different from the outer peripheral seal member material or the outer peripheral seal member material. May be.
- the fuel cell single cell C includes the membrane electrode assembly 1 and a pair of separators (2, 2) that sandwich the membrane electrode assembly 1. Then, a plurality of fuel cell single cells C are stacked to form a fuel cell stack. Further, each separator 2 forms an anode gas flow path Pag, a cathode gas flow path Pac, and a cooling medium flow path Pc. As the separator 2, for example, a metal such as stainless steel can be used.
- the seal structure of the fuel cell stack includes an inner peripheral seal member (3, 3) and an outer peripheral seal member 4 (4A, 4B).
- At least one separator 2 of the pair of separators (2, 2) has an inner peripheral rib 22 that protrudes toward at least the facing surface 2b of the pair of separators (2, 2) at the peripheral portion of the separator 2. . Furthermore, at least one separator 2 of the pair of separators (2, 2) has an outer peripheral rib 21 protruding on the outer peripheral side of the inner peripheral rib 22 toward at least the facing surface 2b side of the pair of separators (2, 2). Yes.
- the separator having the inner peripheral rib and the separator having the outer peripheral rib may be the same or different.
- both of the pair of separators (2, 2) are inner peripheral ribs (22, 22) protruding toward the facing surface 2 b of the pair of separators (2, 2) at the peripheral portion of the separator 2,
- the inner peripheral sealing member 3 closes the space between the inner peripheral ribs (22, 22) of the pair of separators (2, 2) constituting the fuel cell single cell C.
- the outer peripheral seal member 4 is disposed on the outer peripheral side of the inner peripheral seal member 3 and closes between the outer peripheral ribs (21, 21) of the pair of separators (2, 2).
- the inner peripheral sealing member 3 is disposed between the protruding surface 22 a of the inner peripheral rib 22 and the frame 13. This facilitates the alignment of the inner peripheral seal member 3 and improves the sealing performance.
- the outer peripheral end 13a of the frame 13 and the outer peripheral seal member 4 (4A) are disposed apart from each other. Preferably it is.
- the seal structure of the fuel cell stack forms the first closed space CS between the inner peripheral seal member (3, 3) and the outer peripheral seal member 4 (4A, 4B).
- the outer periphery sealing member 4 (4A, 4B) has the notch part n which makes the 1st closed space CS and the exterior E communicate.
- the first closed space CS is along the circumferential direction of the separator 2 (in FIGS. 4 and 5, the direction is perpendicular to the paper surface and in FIG. 6 is the direction indicated by the arrow W). Communicate.
- the outer peripheral seal member has one notch, but may have a plurality of notches according to required performance.
- the membrane electrode assembly 1 includes an electrolyte membrane 11, electrodes (12, 12) that function as an anode and a cathode, and further includes a frame 13.
- a membrane electrode assembly 1 is disposed, for example, in a state where the electrode 12 is joined to one surface of an electrolyte membrane 11 made of a polymer having a resin frame 13 attached to the entire periphery. It can be formed by disposing the electrode 12 in a state of being bonded to the other surface of the film 11.
- the membrane electrode assembly one having no frame attached to the electrolyte membrane or one having a frame attached to a part of the periphery of the electrolyte membrane can be used.
- an electrode composed of a catalyst layer disposed on the electrolyte membrane side and a gas diffusion layer disposed on the opposite side of the electrolyte membrane can be applied.
- the catalyst layer for example, a layer containing carbon particles on which a catalyst component such as platinum is supported can be applied.
- a gas diffusion layer what consists of porous bodies, such as carbon paper, can be applied, for example.
- the outer peripheral ribs (21, 21) have a portion where the distance between the pair of separators (2, 2) is smaller than the distance D between the outer peripheral ends (2a, 2a) of the pair of separators (2, 2).
- the interval d in such a small interval satisfies the relationship that d is smaller than D.
- the outer peripheral ribs (21, 21) have projecting surfaces (21a, 21a) in which the distance between the pair of separators (2, 2) is constant. Further, the outer peripheral ribs (21, 21) have a narrow path N in which the distance between the pair of separators (2, 2) is smaller than the distance D between the outer peripheral ends (2a, 2a) of the pair of separators (2, 2). Such bottleneck spacing in N d N is, d N satisfy the relationship of D less.
- the inner peripheral end 4a of the outer peripheral seal member 4 (4A) is disposed in the bottleneck N.
- one or both of the outer peripheral seal member 4 (4A, 4B) and the inner peripheral seal member 3 have an adhesive function from the viewpoint of improving the sealing performance.
- either one or both of the outer peripheral seal member 4 (4A, 4B) and the inner peripheral seal member 3 are preferably made of a filler from the viewpoint of improving the sealing performance.
- examples of the filler include those made of a resin material from the viewpoint of improving the sealing property.
- the outer peripheral ribs (21, 21) formed on both the pair of separators (2, 2) have a shape of the outer peripheral seal member 4 (4A), which will be described later, in a T-shape. It has become.
- the outer peripheral rib and the inner peripheral rib described above can be formed by, for example, providing a recess by pressing on the surface opposite to the facing surface of the separator, and preferably providing a recess having a flat bottom surface.
- the outer peripheral seal member 4 has an inner outer peripheral seal member 4A and an outer outer peripheral seal member 4B.
- the inner peripheral seal member 4 ⁇ / b> A is integrally disposed at a position outside the narrow path N and the narrow path N. Further, the outer peripheral seal member 4B is disposed at a position outside the inner peripheral seal member 4A. Note that, on the side surface of the fuel cell module M, the outer peripheral seal member 4B is integrated.
- thermosetting resin can be cited as a preferred example from the viewpoint of improving the sealing performance
- outer peripheral seal member 4B a thermoplastic resin can be used from the viewpoint of improving the sealing performance.
- the present invention is not limited to this.
- the outer peripheral seal member may be an integrated member made of the same material for the inner peripheral seal member and the outer peripheral seal member.
- thermosetting resin can be mentioned as a suitable example as an inner peripheral sealing member or a 4th sealing member, it is not limited to this, A thermoplastic resin can also be applied.
- a first closed section is formed between an inner peripheral seal member and an outer peripheral seal member disposed at a predetermined position, and a notch portion that allows the first closed section and the outside to communicate with the outer peripheral seal member. Therefore, damage to the inner peripheral seal member when the outer peripheral seal member is disposed can be suppressed. As a result, it is possible to provide a fuel cell stack sealing structure capable of realizing appropriate sealing by the sealing member even when the interval between the fuel cell single cells is small.
- the inner peripheral seal member (3, 3) is disposed inside the outer peripheral seal member 4 (4A, 4B), the seal of the power generation site is ensured. Further, the outer periphery provided on the outer peripheral ribs (21, 21) in a state where the first closed space CS is provided between the inner peripheral seal members (3, 3) disposed on the inner peripheral ribs (22, 22). Since the seal member 4 (4A, 4B) is disposed, the inner peripheral seal member (3, 3) is hardly damaged, and the seal of the power generation site is maintained.
- the first closed space CS provided between the inner peripheral sealing member (3, 3) and the outer peripheral sealing member 4 (4A, 4B) is communicated with the external E. Therefore, as will be described in detail later, for example, when the outer peripheral seal member material is filled by injection molding, the filling of the outer peripheral seal member material is controlled not only by the injection pressure of the outer peripheral seal member material but also by air escape from the notch n. It becomes possible.
- the inner peripheral seal member is not easily damaged, and the power generation site seal is maintained.
- the outer peripheral rib forms a portion where the distance between the pair of separators is smaller than the distance between the outer peripheral ends of the pair of separators.
- the outer peripheral ribs (21, 21) will be described in detail later.
- the outer peripheral seal member material is filled by injection molding, the outer peripheral seal member material is more difficult to flow into the interior. Therefore, the outer peripheral seal member 4 (4A, 4B) can be reliably disposed at a predetermined position, and the predetermined first closed space CS can be reliably formed. As a result, the inner peripheral seal member is hardly damaged, and the seal of the power generation site is maintained.
- the outer peripheral rib has a projecting surface in which the distance between the pair of separators is constant, and forms a narrow path in which the distance between the pair of separators is smaller than the distance between the outer peripheral ends of the pair of separators.
- the outer peripheral ribs (21, 21) described above are provided, for example, the outer peripheral ribs (21, 21) that receive the injection pressure of the outer peripheral seal member material when the outer peripheral seal member material is filled by injection molding are described later in detail.
- the outer peripheral sealing member 4 can be disposed at a desired position by the outer side surfaces (21b, 21b) of 21). Further, the bottleneck N formed by the outer peripheral ribs (21, 21) makes it difficult for the outer peripheral seal member material to flow into the interior, and the outer peripheral seal member 4 can be disposed at a desired position. As a result, the inner peripheral seal member is hardly damaged, and the seal of the power generation site is maintained.
- the outer peripheral ribs (21, 21) described above are provided, for example, the outer peripheral ribs (21, 21) that receive the injection pressure of the outer peripheral seal member material when the outer peripheral seal member material is filled by injection molding are described later in detail.
- the outer peripheral sealing member 4 can be disposed at a desired position by the outer side surfaces (21b, 21b) of 21). Further, the bottleneck N formed by the outer peripheral ribs (21, 21) makes it difficult for the outer peripheral seal member material to flow into the interior, and the outer peripheral seal member 4 can be disposed at a desired position. As a result, the inner peripheral seal member is hardly damaged, and the seal of the power generation site is maintained.
- the outer peripheral seal member 4 (4A, 4B) and the inner peripheral seal member 3 can maintain the gap between the pair of separators in a bonded state. As a result, the inner peripheral seal member is hardly damaged, and the seal of the power generation site is maintained.
- Either one or both of the outer peripheral seal member and the inner peripheral seal member are made of a filler.
- the outer peripheral seal member 4 (4A, 4B) or the inner peripheral seal member 3 made of a filler can be filled and sealed in portions other than the first closed space or the like in the pair of separators. As a result, the seal of the power generation site is maintained.
- the filler is made of a resin material.
- the outer peripheral seal member 4 (4A, 4B) or the inner peripheral seal member 3 made of a resin material can be filled and sealed in portions other than the first closed space or the like in the pair of separators. As a result, the seal of the power generation site is maintained. In addition, appropriate electrical insulation between the pair of separators can be realized.
- the outer peripheral seal member has an inner peripheral seal member and an outer peripheral seal member.
- the inner peripheral seal member is integrally disposed at a position outside the bottleneck and the bottleneck.
- the outer peripheral seal member is disposed at a position outside the inner peripheral seal member.
- the main functions of the inner peripheral seal member 4A are the following (i) to (iii).
- a predetermined first closed space CS is formed to realize an appropriate seal.
- the inner end 4a is positioned in the narrow path N, and appropriate electrical insulation between the pair of separators (2, 2) is realized.
- (Iii) When filling the outer peripheral seal member material forming the outer peripheral seal member 4B by injection molding, it is difficult for the outer peripheral seal member material to flow into the inside.
- the main functions of the outer peripheral seal member 4B are the following (iv) and (v). (Iv) Arranged between the pair of separators (2, 2) to realize an appropriate seal. (V) The fuel cell module M is integrated on the outer side of the outer peripheral end 2a of the separator 2 to protect the side surface of the fuel cell module M from an external impact or the like.
- the outer peripheral seal member has a notch forming member at the notch.
- the notch forming member 5A when the notch forming member 5A is removed after the notch n is formed, an unnecessary load is applied to the side surface of the fuel cell module M, and the inner peripheral seal member 3 may be damaged. Thus, even after the notch n is formed, the inner peripheral seal member 3 is hardly damaged by the configuration having the notch forming member 5A, and the seal of the power generation site is maintained. Further, as the notch portion forming member 5A, when a material similar to the outer peripheral seal member material or the outer peripheral seal member material or a material made of the same material is applied, the filled outer peripheral seal member material or the outer outer peripheral seal member material is filled. Since the part in contact with the metal is partially melted by heat and welded, the airtightness and durability are high.
- the inner peripheral seal member contains a thermosetting resin.
- the outer peripheral seal member includes a thermoplastic resin.
- the inner peripheral seal member that forms the first closed space CS when the outer peripheral seal member material is filled by injection molding after forming the laminated structure using the inner peripheral seal member material. 4A is not easily damaged by heat. As a result, the inner peripheral seal member is hardly damaged, and the seal of the power generation site is maintained.
- the membrane electrode assembly has a frame held by inner peripheral ribs.
- the inner peripheral seal member 3 is disposed between the projecting surface 22a of the inner peripheral rib 22 and the frame 13, the alignment of the inner peripheral seal member is facilitated and the sealing performance is improved. I can.
- FIG. 7 is a schematic cross-sectional view showing some examples of the seal structure of the fuel cell stack.
- symbol same as them is attached
- subjected and description is abbreviate
- the shape of the outer peripheral seal member 4 (4A) is T-shaped by the outer peripheral ribs (21, 21) formed on both the pair of separators (2, 2).
- the outer peripheral rib 21 can be disperse
- the outer peripheral rib 21 has the narrow path N formed by the protruding surface 21a, the inflow of material into the first closed space CS can be suppressed or prevented.
- the outer peripheral rib 21 has a narrow path N formed by the protruding surface 21a, and the inner peripheral end 4a of the outer peripheral seal member 4 (4A) is disposed in the narrow path N. Therefore, a pair of separators ( The electrical insulation between 2 and 2) becomes more appropriate.
- FIG. 7B it further has the following configuration (14), and although not shown in detail, it also has the configurations (15) and (16) as in FIG. It is also preferable to do. Thereby, even when the interval between the single fuel cells is small, not only an appropriate seal by the seal member of the power generation site but also an appropriate seal by the seal member of the cooling medium flow path can be realized.
- a second inner peripheral sealing member that closes between the peripheral portions of the fuel cell single cells, and an outer peripheral side of the second inner peripheral seal member, and between the peripheral portions of the fuel cell single cells. And a second outer peripheral seal member that closes.
- a second closed space is formed between the second inner peripheral seal member and the second outer peripheral seal member.
- the second outer peripheral seal member has a cutout portion that allows the second closed space to communicate with the outside.
- a first closed section CS is formed between the inner peripheral seal member 3 and the outer peripheral seal member 4, a cutout portion is formed in the outer peripheral seal member 4 so as to communicate the first closed section CS and the outside (not shown),
- the notch part which forms the 2nd closed section CS2 between the 2nd inner circumference seal member 7 and the 2nd outer circumference seal member 8, and makes the 2nd outer circumference seal member 8 connect the 2nd closed section CS2 and the exterior which is not illustrated. Formed. Therefore, when the outer peripheral seal member 4 and the second outer peripheral seal member 8 are disposed, damage to the inner peripheral seal member 3 and the second inner peripheral seal member 7 can be suppressed.
- the inner peripheral seal member 3 may be applied.
- the outer peripheral seal member 4 may be applied as the second outer peripheral seal member 8.
- the second inner peripheral seal member 7 and the second outer peripheral seal member 8 may be separately prepared.
- a seal plate disposed between the fuel cell modules, a third inner peripheral seal member, 3 outer peripheral seal members.
- the third inner peripheral seal member closes between the end separators of the fuel cell modules and the peripheral portions of the seal plate, and the third outer peripheral seal member is disposed on the outer peripheral side of the third inner peripheral seal member. In addition, the gap between the edge separators of the fuel cell modules and the peripheral portions of the seal plate is closed.
- a third closed space is formed between the third inner peripheral seal member and the third outer peripheral seal member.
- the third outer peripheral seal member has a cutout portion that allows the third closed space to communicate with the outside.
- the fuel cell module has an end separator 2 'at the end thereof, and the seal plate P in the illustrated example is formed of the separator (2, 2). Then, a first closed section CS is formed between the inner peripheral seal member 3 and the outer peripheral seal member 4, and a notch portion is formed in the outer peripheral seal member 4 so as to communicate the first closed section CS and the outside (not shown).
- a third closed section CS3 is formed between the third inner peripheral seal member 9 and the third outer peripheral seal member 10 (10A), and the third outer peripheral seal member communicates with the third closed section CS3 and the outside (not shown). A notch was formed. Therefore, when disposing the outer peripheral seal member 4 and the third outer peripheral seal member 10 (10A), damage to the inner peripheral seal member 3 and the third inner peripheral seal member 9 can be suppressed.
- the inner peripheral seal member 3 may be applied.
- the outer peripheral seal member 4 may be applied as the third outer peripheral seal member 10.
- the third inner peripheral seal member 9 and the third outer peripheral seal member 10 may be separately prepared. Note that the configurations shown in FIGS. 7B and 7C may be combined.
- the inner peripheral end 10a is arrange
- FIG. 8 is a schematic cross-sectional view showing a modification of the shape of the outer peripheral rib.
- FIG. 8A shows the outer peripheral ribs (21, 21) formed on both of the pair of separators (2, 2), and the shape of the outer peripheral seal member 4 (4A), which will be described in detail later, will be described in detail.
- FIG. 8B shows an outer peripheral rib (21, 21) formed on one of the pair of separators (2, 2).
- the outer peripheral seal member 4 (4A) which will be described in detail later, will be described later.
- the outer periphery rib whose shape becomes F type is shown.
- FIG. 8C shows an outer peripheral rib 21 formed on both of the pair of separators (2, 2).
- the shape of the outer peripheral seal member 4 (4A), which will be described in detail later, is Y.
- mold is shown.
- FIG. 8D shows an outer peripheral rib 21 formed on one of the pair of separators (2, 2), and the shape of the outer peripheral seal member 4 (4A), which will be described in detail later, is L.
- FIG. 8E shows outer peripheral ribs (21, 21) formed on both of the pair of separators (2, 2).
- the outer peripheral seal member 4 (4A), which will be described in detail later, will be described later.
- FIG. 8 (F) shows outer peripheral ribs (21, 21) formed on both of the pair of separators (2, 2), and an outer peripheral seal member 4 (4A) described later in detail formed thereby.
- the outer peripheral rib whose shape becomes an inverse type is shown.
- the outer peripheral rib 21 shown in FIG. 8 can be dispersed on the outer side surface 21b while receiving the injection pressure when the outer peripheral seal member material is filled by injection molding. Therefore, the inflow of material into the first closed space CS can be suppressed or prevented. Moreover, since the outer peripheral rib 21 shown in FIG. 8 has the bottleneck N formed by the protrusion surface 21a, the inflow of the material to the first closed space CS can be suppressed or prevented. Further, the outer peripheral rib 21 shown in FIG. 8 has a narrow path N formed by the protruding surface 21a, and the inner peripheral end 4a of the outer peripheral seal member 4 (4A) is located in the narrow path N. The electrical insulation between the separators (2, 2) becomes more appropriate.
- the present inventors have examined a seal structure of a fuel cell stack that can realize an appropriate seal with a seal member even when the interval between the fuel cell single cells is small. It was found that it can be obtained.
- the outer peripheral seal member is formed so as to form a closed space communicating with the inner peripheral seal member along the circumferential direction of the separator. It has been found that a new problem to be solved arises only by arranging.
- a first closed space is formed between the inner peripheral seal member and the outer peripheral seal member disposed at a predetermined position, and the outer peripheral seal member has a notch portion that communicates the first closed space with the outside. It has been found that the above-described object can be achieved by having the configuration, and the present invention has been completed.
- FIG. 10A is a perspective view showing a fuel cell module according to the second embodiment of the present invention, and FIG. 10B is surrounded by a B line of the fuel cell module shown in FIG. FIG.
- the fuel cell module M2 of the present embodiment has a configuration in which the notch forming member 5A is covered with the outer peripheral seal member 4 (4B). Is different.
- the notch portion forming member is integrated with the outer peripheral seal member, so that the airtightness and durability are higher.
- FIG. 11 is a perspective view showing a fuel cell module according to a third embodiment of the present invention.
- the outer peripheral seal member 4 (4B) has a pair of plate-shaped notch forming members 5B in the notch n, and the separator is a flat surface.
- the configuration has a protruding measurement terminal 23 extending in the direction, and the measurement terminal 23 is exposed at the notch n, which is different from the fuel cell module of the first embodiment described above.
- the measurement terminal is exposed in the cutout portion, so that, for example, a voltage test of a single fuel cell can be performed.
- FIG. 12A is a perspective view showing a fuel cell module according to the fourth embodiment of the present invention, and FIG. 12B is surrounded by a B line of the fuel cell module shown in FIG. FIG.
- the fuel cell module M4 of this embodiment has a configuration in which the notch portion forming member 5B is covered with the outer peripheral seal member 4 (4B). Is different.
- the notch portion forming member is integrated with the outer peripheral seal member, so that airtightness and durability are higher.
- the manufacturing method of the seal structure of the fuel cell stack or module of each embodiment described above will be described in detail with some examples.
- a desired fuel cell stack or module seal structure can be produced with high productivity.
- the seal structure of the fuel cell stack or module of the present invention is not limited to that obtained by such a manufacturing method.
- An example of the manufacturing method of the fuel cell stack or module seal structure of the embodiment described above includes the following steps (1) to (3).
- an inner peripheral seal member is formed on at least one of the pair of separators so as to form an inner peripheral seal member that closes between the inner peripheral ribs of the pair of separators.
- a laminated structure is manufactured by applying an inner peripheral seal member material forming the seal member.
- the inner peripheral sealing member material preferably has an adhesive function, is preferably filled, and is preferably a resin material. Specifically, it is preferable to apply a thermosetting adhesive. Moreover, in this process, when apply
- step (2) performed after step (1), a notch portion forming member for forming a notch portion on the side surface of the laminated structure is disposed.
- the notch part forming member used in the step (2) is not particularly limited as long as it can prevent or suppress the inflow of the material between the notch part and the measurement terminal.
- the notch forming member for example, a resin frame shape or a pair of plate shapes can be applied. Further, the notch forming member can be appropriately arranged according to the position and quantity of the notch provided on the side surface of the fuel cell module.
- the outer peripheral seal member is disposed on the outer peripheral side of the inner peripheral seal member, and forms an outer peripheral seal member that closes between the outer peripheral ribs of the pair of separators, the first closed space, and the notch.
- the outer peripheral seal member material to be formed is filled by injection molding.
- the outer peripheral sealing member material preferably has an adhesive function, is preferably filled, and is preferably a resin material. Specifically, it is preferable to apply a molten thermoplastic resin.
- the thermoplastic resin has a melt viscosity of 80 Pa ⁇ s to 100 Pa ⁇ s at a temperature of 200 ° C. and a shear rate of 1000 / s in accordance with JIS K7199, for example. It is preferable to use a low viscosity thermoplastic resin such as polypropylene. Furthermore, it is preferable to fill such a low-viscosity thermoplastic resin at such a low pressure that the pressure applied to the inner peripheral sealing member is 60 MPa or more and 70 MPa or less, for example.
- the filling of the outer peripheral seal member material can be controlled by the injection pressure of the outer peripheral seal member material.
- the present invention is not limited to this.
- the filling of the outer peripheral seal member material can be controlled not only by the injection pressure of the outer peripheral seal member material but also by air escape from the notch.
- the seal structure of the fuel cell stack has a predetermined configuration, it is preferable to perform the following operations in the steps (1) to (3). With such a manufacturing method, a desired fuel cell stack seal structure can be produced with high productivity.
- an uncoated portion that forms a notched portion that is aligned so as to form the first closed space and a part of the notched portion is provided, and a bottleneck of at least one of the pair of separators
- the inner peripheral seal member material that forms the inner peripheral seal member, which is a part of the outer peripheral seal member, is further applied to a position outside the bottleneck.
- coating an inner peripheral sealing member material or an inner peripheral sealing member material it can apply
- the notch forming member is disposed on the uncoated portion on the side surface of the laminated structure.
- the notch part formation member used in this process (2) will not be specifically limited if it can prevent thru
- the notch forming member for example, a resin frame shape or a pair of plate shapes can be applied. Further, the notch forming member can be appropriately arranged according to the position and quantity of the notch provided on the side surface of the fuel cell module.
- the outer peripheral seal member that is a part of the outer peripheral seal member is formed so as to form the outer peripheral seal member disposed at a position outside the inner peripheral seal member and the other part of the notch.
- the outer peripheral seal member material is filled.
- the degree of freedom of the melt viscosity and injection pressure of the thermoplastic resin is higher than in the above-described step (3).
- the filling of the outer peripheral seal member material can be controlled by the injection pressure of the outer peripheral seal member material.
- the injection pressure can be 60 MPa or more and 140 MPa or less.
- the above-mentioned predetermined configurations are the following (i) to (vi).
- the outer peripheral rib has a protruding surface in which the distance between the pair of separators is constant, and forms a narrow path in which the distance between the pair of separators is smaller than the distance between the outer peripheral ends of the pair of separators.
- the inner peripheral end of the outer peripheral seal member is disposed in the bottleneck.
- the outer peripheral seal member has an inner peripheral seal member and an outer peripheral seal member.
- the inner peripheral seal member is integrally disposed at a position outside the bottleneck and the bottleneck.
- the outer peripheral seal member is disposed at a position outside the inner peripheral seal member.
- the outer peripheral seal member has a notch forming member at the notch.
- FIG. 13A is a schematic cross-sectional view showing the laminated structure before the jig is inserted
- FIG. 13B is a schematic cross-sectional view showing the laminated structure after the jig is inserted.
- FIG. 14A is a cross-sectional view showing a state before an example of the notch forming member is inserted into the laminated structure
- FIG. 14B is an example of inserting the example of the notch forming member into the laminated structure. It is sectional drawing which shows a back state.
- the notch forming member 5A is arranged in an unapplied portion of the second inner resin material that becomes the notch n on the side surface of the multilayer structure LP. Thereby, a desired notch part can be formed.
- FIG. 15A is a perspective view showing a main part in a state before insertion of another example of the notch forming member into the laminated structure, and FIG. 15B shows the other of the notch forming member. It is a perspective view which shows the principal part of the state after inserting an example into a laminated structure.
- FIG. 16A is a perspective view showing a main part in a state before inserting still another example of the notch forming member into the laminated structure, and FIG. 16B shows the notch forming member. It is a perspective view which shows the principal part of the state after inserting another example into a laminated structure.
- FIGS. 15 and 16 a stacked structure in which three fuel cell single cells are stacked is shown.
- the notch forming member 5A is inserted at a position where the notch forming member 5A contacts the inner peripheral seal member 4A. To do.
- the notch portion forming member 5B is inserted into a position where it comes into contact with the inner peripheral seal member 4A. Thereby, the inflow of the resin between the notch and the measurement terminal can be prevented or suppressed.
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Abstract
Description
まず、本発明の第1の実施形態に係る燃料電池スタック及び燃料電池モジュールについて図面を参照しながら詳細に説明する。なお、以下の実施形態で引用する図面の寸法比率は、説明の都合上誇張されており、実際の比率とは異なる場合がある。
(8)内側外周シール部材が、隘路及び隘路より外側の位置に一体的に配設されている。
(9)外側外周シール部材が、内側外周シール部材より外側の位置に配設されている。
(i)所定の第1閉空間CSを形成して、適切なシールを実現する。
(ii)隘路Nに内端部4aを位置させ、一対のセパレータ(2,2)の間における適切な電気絶縁を実現する。
(iii)外側外周シール部材4Bを形成する外側外周シール部材材料を射出成形により充填する際に、外側外周シール部材材料を内部に流入し難くする。
(iv)一対のセパレータ(2,2)の間に配設されて、適切なシールを実現する。
(v)セパレータ2の外周端2aより外側で一体化して、燃料電池モジュールMの側面を外部からの衝撃などから保護する。
(12)外側外周シール部材が、熱可塑性樹脂を含む。
(15)第2内周シール部材と第2外周シール部材との間で第2閉空間を形成している。
(16)第2外周シール部材が、第2閉空間と外部とを連通させる切欠部を有している。
(18)第3内周シール部材は、各燃料電池モジュールの端部セパレータ及びシールプレートの周縁部分同士の間を閉塞し、第3外周シール部材は、第3内周シール部材の外周側に配置され、かつ、各燃料電池モジュールの端部セパレータ及びシールプレートの周縁部分同士の間を閉塞する。
(19)第3内周シール部材と第3外周シール部材との間で第3閉空間を形成している。
(20)第3外周シール部材が、第3閉空間と外部とを連通させる切欠部を有している。
次に、本発明の第2の実施形態に係る燃料電池モジュールについて図面を参照しながら詳細に説明する。なお、上述した実施形態において説明したものと同等のものについては、それらと同一の符号を付して説明を省略する。
次に、本発明の第3の実施形態に係る燃料電池モジュールについて図面を参照しながら詳細に説明する。なお、上述した実施形態において説明したものと同等のものについては、それらと同一の符号を付して説明を省略する。
次に、本発明の第4の実施形態に係る燃料電池モジュールについて図面を参照しながら詳細に説明する。なお、上述した実施形態において説明したものと同等のものについては、それらと同一の符号を付して説明を省略する。
(ii)外周シール部材の内周端が、隘路に配設されている。
(iii)外周シール部材が、内側外周シール部材と、外側外周シール部材と、を有する。
(iv)内側外周シール部材が、隘路及び隘路より外側の位置に一体的に配設されている。
(v)外側外周シール部材が、内側外周シール部材より外側の位置に配設されている。
(vi)外周シール部材が、切欠部に切欠部形成部材を有する。
2 セパレータ
2’ 端部セパレータ
2a 外周端
2b 対向面
3 内周シール部材
3a 外周端
4 外周シール部材
4A 内側外周シール部材
4B 外側外周シール部材
4a 内周端
5A,5B 切欠部形成部材
6 第4シール部材
7 第2内周シール部材
8 第2外周シール部材
9 第3内周シール部材
10 第3外周シール部材
10A 第3内側外周シール部材
10a 内周端
11 電解質膜
12 電極
13 フレーム
13a 外周端
21 外周リブ
21a 突出面
21b 外側側面
22 内周リブ
22a 突出面
23 測定用端子
30 治具
56A,56B エンドプレート
57A,57B 締結板
57s スリット
58A,58B 補強板
FS 燃料電池スタック
C 燃料電池単セル
M,M2~M4 燃料電池モジュール
P シールプレート
LP 積層構造体
H1~H6 マニホールド穴
Pag アノードガス流路
Pcg カソードガス流路
Pa 冷却媒体流路
D,d,dN 間隔
E 外部
N 隘路
n 切欠部
CS 第1閉空間
CS2 第2閉空間
CS3 第3閉空間
Claims (19)
- 膜電極接合体と前記膜電極接合体を挟持する一対のセパレータとを有する燃料電池単セルを複数積層して成る燃料電池スタックにおいて、
一対のセパレータの少なくとも一方のセパレータが、前記セパレータの周縁部分において前記一対のセパレータの少なくとも対向面側に突出した内周リブを有しており、
前記一対のセパレータの少なくとも一方のセパレータが、前記内周リブの外周側において前記一対のセパレータの少なくとも対向面側に突出した外周リブを有しており、
前記燃料電池単セルを構成する前記一対のセパレータの内周リブ間を閉塞する内周シール部材と、
前記内周シール部材の外周側に配置され、かつ、前記一対のセパレータの外周リブ間を閉塞する外周シール部材と、を備え、
前記内周シール部材と前記外周シール部材との間で第1閉空間を形成しているとともに、
前記外周シール部材が、前記第1閉空間と外部とを連通させる切欠部を有している
ことを特徴とする燃料電池スタックのシール構造。 - 前記外周リブが、前記一対のセパレータの外周端の間隔より前記一対のセパレータの間隔が小さい部位を形成していることを特徴とする請求項1に記載の燃料電池スタックのシール構造。
- 前記外周リブが、前記一対のセパレータの間隔が一定である突出面を有しており、かつ、前記一対のセパレータの外周端の間隔より前記一対のセパレータの間隔が小さい隘路を形成していることを特徴とする請求項1又は2に記載の燃料電池スタックのシール構造。
- 前記外周シール部材の内周端が、前記隘路に配設されていることを特徴とする請求項3に記載の燃料電池スタックのシール構造。
- 前記外周シール部材及び/又は前記内周シール部材が、接着機能を有することを特徴とする請求項1~4のいずれか1つの項に記載の燃料電池スタックのシール構造。
- 前記外周シール部材及び/又は前記内周シール部材が、充填剤からなることを特徴とする請求項1~5のいずれか1つの項に記載の燃料電池スタックのシール構造。
- 前記充填剤が、樹脂材料からなることを特徴とする請求項6に記載の燃料電池スタックのシール構造。
- 前記外周シール部材が、内側外周シール部材と、外側外周シール部材と、を有しており、
前記内側外周シール部材が、前記隘路及び前記隘路より外側の位置に一体的に配設されており、
前記外側外周シール部材が、前記内側外周シール部材より外側の位置に配設されている
ことを特徴とする請求項4に記載の燃料電池スタックのシール構造。 - 前記外周シール部材が、前記切欠部に切欠部形成部材を有することを特徴とする請求項1~8のいずれか1つの項に記載の燃料電池スタックのシール構造。
- 前記内側外周シール部材が、熱硬化性樹脂を含み、
前記外側外周シール部材が、熱可塑性樹脂を含む
ことを特徴とする請求項8に記載の燃料電池スタックのシール構造。 - 前記膜電極接合体が、フレームを有し、
前記フレームが、前記内周リブにより保持されている
ことを特徴とする請求項1に記載の燃料電池スタックのシール構造。 - 前記燃料電池単セルの周縁部分同士の間を閉塞する第2内周シール部材と、
前記第2内周シール部材の外周側に配置され、かつ、前記燃料電池単セルの周縁部分同士の間を閉塞する第2外周シール部材と、を備え、
前記第2内周シール部材と前記第2外周シール部材との間で第2閉空間を形成しているとともに、
前記第2外周シール部材が、前記第2閉空間と前記外部とを連通させる切欠部を有している
ことを特徴とする請求項1に記載の燃料電池スタックのシール構造。 - 前記燃料電池スタックが、前記燃料電池単セルを複数積層して成る燃料電池モジュールを複数積層して成ることを特徴とする請求項1に記載の燃料電池スタックのシール構造。
- 前記燃料電池モジュールの間に配置されるシールプレートと、
前記各燃料電池モジュールの端部セパレータ及びシールプレートの周縁部分同士の間を閉塞する第3内周シール部材と、
前記第3内周シール部材の外周側に配置され、かつ、前記各燃料電池モジュールの前記端部セパレータ及び前記シールプレートの周縁部分同士の間を閉塞する第3外周シール部材と、を備え、
前記第3内周シール部材と前記第3外周シール部材との間で第3閉空間を形成しているとともに、
前記第3外周シール部材が、前記第3閉空間と前記外部とを連通させる切欠部を有している
ことを特徴とする請求項13に記載の燃料電池スタックのシール構造。 - 前記切欠部形成部材が、前記外周シール部材で覆われていることを特徴とする請求項9に記載の燃料電池スタックのシール構造。
- 前記一対のセパレータの少なくとも一方のセパレータが、前記セパレータの平面方向に延出した突起状の測定用端子を有しており、
前記測定用端子が、前記切欠部において露出している
ことを特徴とする請求項1に記載の燃料電池スタックのシール構造。 - 膜電極接合体と前記膜電極接合体を挟持する一対のセパレータとを有する燃料電池単セルを複数積層して成る燃料電池スタックにおいて、
一対のセパレータの少なくとも一方のセパレータが、前記セパレータの周縁部分において前記一対のセパレータの少なくとも対向面側に突出した内周リブを有しており、
前記一対のセパレータの少なくとも一方のセパレータが、前記内周リブの外周側において前記一対のセパレータの少なくとも対向面側に突出した外周リブを有しており、
前記燃料電池単セルを構成する前記一対のセパレータの内周リブ間を閉塞する内周シール部材と、
前記内周シール部材の外周側に配置され、かつ、前記一対のセパレータの外周リブ間を閉塞する外周シール部材と、を備え、
前記内周シール部材と前記外周シール部材との間で第1閉空間を形成しているとともに、
前記外周シール部材が、前記第1閉空間と外部とを連通させる切欠部を有している
燃料電池スタックのシール構造の製造方法であって、
前記膜電極接合体を前記一対のセパレータで挟持する際に、前記一対のセパレータの内周リブ間を閉塞する前記内周シール部材を形成するように前記一対のセパレータの少なくとも一方の内周リブに前記内周シール部材を形成する内周シール部材材料を塗布して、積層構造体を作製する工程(1)と、
前記工程(1)の後に実行される、前記積層構造体の側面に前記切欠部を形成するための切欠部形成部材を配置する工程(2)と、
前記工程(2)の後に実行される、前記積層構造体を金型に配設し、前記内周シール部材の外周側に配置され、かつ、前記一対のセパレータの外周リブ間を閉塞する外周シール部材と前記第1閉空間と前記切欠部とを形成するように前記外周シール部材を形成する外周シール部材材料を充填する工程(3)と、を含む
ことを特徴とする燃料電池スタックのシール構造の製造方法。 - 前記外周リブが、前記一対のセパレータの間隔が一定である突出面を有しており、かつ、前記一対のセパレータの外周端の間隔より前記一対のセパレータの間隔が小さい隘路を形成しており、
前記外周シール部材の内周端が、前記隘路に配設されており、
前記外周シール部材が、内側外周シール部材と、外側外周シール部材と、を有しており、
前記内側外周シール部材が、前記隘路及び前記隘路より外側の位置に一体的に配設されており、
前記外側外周シール部材が、前記内側外周シール部材より外側の位置に配設されており、
前記外周シール部材が、前記切欠部に切欠部形成部材を有する
燃料電池スタックのシール構造の製造方法であって、
前記工程(1)において、前記第1閉空間と前記切欠部の一部とを形成するように位置合わせされた前記切欠部を形成する未塗布部を設けて、前記一対のセパレータの少なくとも一方の前記一対のセパレータの隘路から隘路より外側となる位置に前記外周シール部材の一部である前記内側外周シール部材を形成する内側外周シール部材材料をさらに塗布し、
前記工程(2)において、前記切欠部形成部材を前記積層構造体の側面の前記未塗布部に配置し、
前記工程(3)において、前記内側外周シール部材より外側の位置に配設される前記外側外周シール部材と前記切欠部の他部とを形成するように前記外周シール部材の一部である前記外側外周シール部材を形成する外側外周シール部材材料を充填する
ことを特徴とする請求項17に記載の燃料電池スタックのシール構造の製造方法。 - 前記内側外周シール部材材料が、熱硬化性接着剤であり、
前記外側外周シール部材材料が、溶融状態の熱可塑性樹脂である
ことを特徴とする請求項18に記載の燃料電池スタックのシール構造の製造方法。
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