WO2017145436A1 - 燃料電池スタック - Google Patents
燃料電池スタック Download PDFInfo
- Publication number
- WO2017145436A1 WO2017145436A1 PCT/JP2016/080703 JP2016080703W WO2017145436A1 WO 2017145436 A1 WO2017145436 A1 WO 2017145436A1 JP 2016080703 W JP2016080703 W JP 2016080703W WO 2017145436 A1 WO2017145436 A1 WO 2017145436A1
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- WIPO (PCT)
- Prior art keywords
- frame
- fuel cell
- cell stack
- protrusions
- protruding portion
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
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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
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
- H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
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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
- H01M8/247—Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
- H01M8/2475—Enclosures, casings or containers of fuel cell stacks
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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
- H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention relates to a fuel cell stack provided with a laminate formed by laminating a plurality of single cells.
- Patent Document 1 As a conventional fuel cell stack, for example, there is one described in Patent Document 1.
- the fuel cell stack described in Patent Document 1 has a stack cell structure in which a joined body in which a reinforcing frame is provided on the outer periphery of an electrolyte (electrolyte membrane) and a plurality of separators each having a gas flow path are stacked. Yes.
- a separator is arranged in a reinforcing frame, and at this time, the separator and the reinforcing frame are arranged so that they do not interfere with each other, or the outer circumference of the separator is flush with the inner circumference of the reinforcing frame. ing.
- the fuel cell stack described above is to maintain the power generation efficiency by preventing deformation of the electrolyte.
- the stack in order to achieve waterproofness and airtightness of a single cell laminate, or protection of a single cell, etc., the stack is generally accommodated in a case.
- a short circuit may occur due to contact between the separators constituting the single cell or contact between the separator and the case.
- the present invention has been made in view of the above-described conventional situation, and in a fuel cell stack including a stacked body in which a plurality of single cells are stacked and a case for housing the stacked body, short-circuiting of the single cells is performed.
- An object of the present invention is to provide a fuel cell stack that can be prevented.
- a fuel cell stack includes a single cell including a frame that holds an outer peripheral portion of a membrane electrode assembly, and a pair of separators disposed on both sides of the membrane electrode assembly and the frame. Is a structure including a laminate formed by laminating a plurality of layers and a case for housing the laminate.
- the frame has a protruding portion that protrudes outward from the outer peripheral end portion of the separator at the outer peripheral portion of the frame body, and the protruding portion is at least larger than the interval between the frame and the end portion of the separator. It has a large protruding length and can be bent with respect to the frame body.
- the protruding portion of each frame is in a protruding state on the outer peripheral portion of each stacked single cell.
- the protrusion has a protrusion length that is at least larger than the distance between the frame and the end of the separator. Therefore, when the protrusion is bent with respect to the frame body, the fuel cell stack is in a state where the protrusion covers the end face of one separator of its own single cell and the end face of at least one separator of the adjacent single cell. . Such a state is continuously obtained in the stacking direction at the arrangement positions of the protrusions in the stack. Further, when the laminated body is accommodated in the case, a protruding portion is interposed between the end faces of these separators and the case.
- the fuel cell stack can prevent the short circuit of the single cell by preventing the contact between the separators constituting the single cell or the contact between the end face of the separator and the case by the protruding portion.
- FIG. 1A and 1B are a perspective view and a perspective exploded view illustrating a first embodiment of a fuel cell stack according to the present invention.
- FIG. 3 is a plan view (A) of a frame, a perspective view (B) of a laminated body, and a cross-sectional view (C) based on the line AA in FIG. B in the first embodiment.
- FIG. 4 is a plan view (A) of a separator for explaining a second embodiment of a fuel cell stack according to the present invention, and a sectional view (B) based on the AA line in FIG.
- FIG. 10 is a plan view (A) to (H) for explaining another eight examples of the protrusions.
- FIG. 1 It is a top view of the flame
- the top view (A) of the frame explaining the sixth embodiment of the fuel cell stack according to the present invention, the perspective view (B) of the laminate, the cross-sectional view (C) based on the AA line in FIG. 6 is a cross-sectional view (D) based on the line BB in B.
- FIG. 9 A plan view (A) in which the upper and lower frames shown in FIG. 9 are overlapped, a cross-sectional view (B) based on the AA line in FIG. A, and a cross-sectional view (C) based on the BB line in FIG. ).
- a stacked body A is configured by stacking a plurality of rectangular single cells C.
- An end plate 56A is disposed at one end portion (right end portion in the drawing) of the laminate A via a current collector plate 54A and a spacer 55, and at the other end portion of the laminate A in the laminate direction.
- the end plate 56B is disposed via the current collecting plate 54B.
- the fuel cell stack FS has fastening plates 57A and 57B provided on both surfaces (upper and lower surfaces in FIG. 1) on the long side of the single cell C, and reinforcing plates 58A on both surfaces on the short side. , 58B are provided.
- the fastening plates 57A and 57B and the reinforcing plates 58A and 58B are connected to both end plates 56A and 56B by bolts B.
- the fuel cell stack FS has a case-integrated structure as shown in FIG. 1B, and the stack A is restrained and pressed in the stacking direction so that a predetermined contact surface pressure is applied to each single cell C. In addition, gas sealability, conductivity, etc. are maintained well.
- the fastening plates 57A and 57B and the reinforcing plates 58A and 58B correspond to the case 50 in which the stacked body A is accommodated.
- the single cell C includes a frame 2 that holds the outer periphery of the membrane electrode assembly 1, and a pair of separators 3 and 4 disposed on both sides of the membrane electrode assembly 1 and the frame 2. And have.
- This single cell C forms a flow path for anode gas (hydrogen-containing gas) between the membrane electrode assembly 1 and one separator 3, and between the membrane electrode assembly 1 and the other separator 4.
- a flow path for cathode gas (oxygen-containing gas: for example, air) is formed.
- the membrane electrode assembly 1 is generally called MEA (Membrane Electrode Assembly) and has a structure in which an electrolyte membrane made of a solid polymer is sandwiched between an anode electrode and a cathode electrode.
- the electrode includes a catalyst layer that performs a catalytic reaction, a gas diffusion layer that enhances the diffusibility of the anode gas and the cathode gas, and the like.
- the frame 2 is a thin film member having insulating properties, and is a plastic film, for example.
- the frame 2 is integrated with the outer periphery of the membrane electrode assembly 1 disposed inside thereof, so that the membrane electrode assembly 1 is keeping. The detailed structure of the frame 2 will be described later.
- Each separator 3, 4 is made of, for example, stainless steel, and is formed into an appropriate shape by press working or the like, and a central region corresponding to the membrane electrode assembly 1 is formed in a concavo-convex shape continuous in the long side direction. is there.
- Each of the separators 3 and 4 has a corrugated convex portion in contact with the membrane electrode assembly 1 in a portion having an uneven cross-sectional shape, and a gas flow communicating in the long side direction between the corrugated concave portion and the membrane electrode assembly 1. Form a road.
- the frame 2 and the separators 3 and 4 have manifold holes H1 to H6 that communicate with each other to form a fluid manifold in a state where the single cells C are stacked.
- manifold holes H1 to H3 and H4 to H6 are provided along the short sides on both sides of the frame 2 and the separators 3 and 4, respectively.
- manifold holes H1 to H3 arranged along one short side in each drawing are for cathode gas supply (H1), coolant supply (H2), and anode gas discharge (H3).
- the manifold holes H4 to H6 arranged along the other short side in each figure are for anode gas supply (H4), coolant discharge (H5), and cathode gas discharge (H6).
- the positional relationship between supply and discharge of the manifold holes H1 to H6 may be partially or entirely reversed.
- the frame 2 and each of the separators 3 and 4 are hermetically bonded to each other and the periphery of the manifold holes H1 to H6 with an adhesive sealing material (see reference numeral SL in FIG. 2). It is. At this time, a part of the sealing material disposed around the manifold holes H1 to H6 is opened as an inlet / outlet so that the corresponding fluid can flow through each flow path.
- the frame 2 constituting each single cell C protrudes outward from the outer peripheral end of the separators 3 and 4 at the outer peripheral portion of the frame main body 2A. It has the protrusion part 11 which does.
- the frame 2 in the illustrated example has rectangular protrusions 11 at a total of eight places, three places on both long sides of the frame body 2A and one place on the center of both short sides. The three protrusions 11 on each long side are arranged at equal intervals.
- the frame 2 of each single cell C has the same form.
- the protruding portion 11 is arranged at a point-symmetrical position with respect to the center of gravity G in the plane of the frame main body 2A. Further, as shown in FIG. 2 (C), the protruding portion 11 has a protruding length L that is at least larger than the interval S between the frame 2 and the end of the separator 3 (4), and with respect to the frame body 2A. Can be bent.
- the frame 2 may have a configuration in which a bent portion 11A is formed on the base portion of the projecting portion 11 so as to promote bending as a more preferable embodiment.
- a bent portion 11A include a groove (thin wall portion) formed by pressing or cutting, a crease, a perforation, and the like.
- the frame 2 is, as shown in FIG. 2 (B), at least a part of the protruding portion 11 of the adjacent single cell C when the protruding length L of the protruding portion 11 is bent. It is good also as a structure which makes it the length which overlaps.
- the protruding portions 11 of the respective frames 2 are in a protruding state on the outer peripheral portion of each stacked single cell C.
- the protrusion 11 has a protrusion length L that is at least larger than the distance S between the frame 2 and the end of the separator 3 (4), or a protrusion length L that is longer than that.
- the fuel cell stack FS is configured such that when the protrusion 11 is bent upward (or downward), the end surface of the upper separator 3 of its own unit cell C, and The protruding portion 11 covers at least the end surface of the lower separator 4 of the unit cell C adjacent to the upper side.
- the fuel cell stack FS has a space between the end face of the separators 3 and 4 and the case 50, as shown in FIG.
- the protruding portion 11 is interposed.
- the fuel cell stack FS prevents the contact between the separators 3 and 4 constituting the single cell C and the contact between the end surfaces of the separators 3 and 4 and the case 50 by the protruding portion 11. A short circuit can be prevented.
- the fuel cell stack FS has the protruding portion 11 interposed between the end faces of the separators 3 and 4 and the case 50, the gap between the case 50 and the laminate A is minimized to provide insulation. It becomes possible to hold the laminate A while maintaining it, and satisfactory vibration resistance and impact resistance can be satisfied.
- the fuel cell stack FS can prevent short-circuiting of the single cell C without using any other member or insulating coating by the protruding portion 11 integrated with the frame 2, thereby improving productivity.
- the manufacturing cost can be reduced, and the laminate A can be reduced in size.
- the frame 2 has a bent portion 11A that is processed to promote bending at the base portion of the protruding portion 11, so that the bending of the protruding portion 11 becomes very easy. As a result, the assembly workability is further improved.
- the protruding length L of the protruding portion 11 is set to a length that overlaps at least a part of the protruding portion 11 of the adjacent single cell C in the bent state.
- the end faces of the separators 3 and 4 can be completely covered.
- the protruding portion 11 is arranged in a point-symmetrical position with respect to the center of gravity G in the plane of the frame body 2A, the protruding portion 11 is balanced on the entire circumference of the single cell C. It is well arranged, and the function of preventing the short circuit of the single cell C and the function of vibration resistance and impact resistance can be further enhanced.
- FIGS. 3 to 9 are diagrams for explaining second to seventh embodiments of the fuel cell stack according to the present invention.
- the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the fuel cell stack FS shown in FIG. 3 includes a bent portion 3A in which the frame 2 in each single cell C has a protruding portion 11 on the outer peripheral portion thereof and is bent downward (or upward) on the outer peripheral portion of the separators 3 and 4. , 4A are provided.
- the bent portions 3 ⁇ / b> A and 4 ⁇ / b> A in the illustrated example are formed at three locations on both long sides of the separators 3 and 4.
- the bending part 4A of the lower separator 4 of the single cell C is outside the bending part 3A of the upper separator 3 of the single cell C adjacent to the lower side. Is engaged so as to cover.
- the fuel cell stack FS having the above-described configuration can prevent the single cell C from being short-circuited by the protruding portion 11 as in the previous embodiment. Further, the fuel cell stack FS can increase the rigidity of the outer periphery of the separators 3 and 4 by the bent portions 3A and 4A, and the single cells C adjacent in the stacking direction are positioned with respect to each other, The short-circuit prevention function of the single cell C and the vibration resistance and impact resistance functions can be further enhanced.
- FIG. 4 is a diagram for explaining another form of the protruding portion 11 in the frame 2.
- Various shapes and bent portions 11 ⁇ / b> A can be adopted for the protruding portion 11.
- the protruding portion 11 shown in FIG. 4A has a rectangular shape similar to that described in the previous embodiment, and has a bent portion 11A at the base.
- the protrusion 11 shown in FIG. 4B has a triangular shape and has a bent portion 11A at the base.
- the protrusion 11 shown in FIG. 4 (C) has a trapezoidal shape with the tip as the upper base, and has a bent portion 11A at the base (lower base).
- the protrusion 11 shown in FIG. 4D has a semicircular shape and has a bent portion 11A at the base.
- Projection 11 shown in FIG. 4 (E) has a trapezoidal shape with the tip at the hypotenuse, and has a bent portion 11A at the base.
- the protruding portion 11 shown in FIG. 4G has a rectangular shape, and a notched portion that connects the center in the width direction and the frame body 2A is a bent portion 11A.
- the protruding portion 11 shown in FIG. 4 (H) has a rectangular shape, and has a bent portion 11A that is bent at the base by hot pressing.
- the protrusion 11 in the frame 2 can be easily bent with respect to the frame body 2 ⁇ / b> A by adopting various shapes and bending portions 11 ⁇ / b> A.
- the function to prevent will be exhibited.
- the protrusion part 11 can prevent the short circuit of the single cell C, it is naturally possible to adopt the configuration shown in FIG. 4 and other forms.
- the frame 2 of the fuel cell stack shown in FIG. 5 has a frame body 2A having a rectangular shape, and includes a protrusion 11 on one side of at least two parallel sides and a protrusion 11 on the other side. However, they are arranged alternately.
- the frame 2 in the illustrated example has protrusions 11 on both long sides, and has three protrusions 11 on one long side and four protrusions 11 on the other long side. .
- each protrusion 11 has the same width dimension W1, and this width dimension W1 is equal to the interval W2 between adjacent protrusions 11 on the same side.
- the frame 2 is cut from the continuous frame material F as indicated by imaginary lines in the figure, and is on a side (long side) orthogonal to the continuous direction of the frame material F (the arrow direction in the figure).
- the protrusion part 11 is arrange
- the frame material F has, for example, a belt shape and is wound in a roll shape, and an opening K for arranging the membrane electrode assembly, manifold holes H1 to H6, and a plurality of protrusions 11 are formed by press cutting. .
- the frame 2 can use the frame material F without waste, and can improve the material yield and reduce the manufacturing cost.
- the frame body 2 ⁇ / b> A has a rectangular shape and has protruding portions 11 on both long sides.
- the frame 2 in the illustrated example has seven projecting portions 11 arranged on both long sides without any gaps, and each projecting portion 11 has a trapezoidal shape with the tip as an oblique side, and the projecting portion on one long side.
- the oblique side of 11 and the oblique side of the projection 11 of the other long side are parallel to each other.
- the short-circuit of the single cell C can be prevented by the protruding portion 11 as in the previous embodiment. Is cut from the continuous frame material F, as indicated by a virtual line.
- the frame 2 on the frame material F, the oblique side of the protruding portion 11 of the frame 2 and the oblique side of the protruding portion 11 of the adjacent frame 2 are combined.
- the frame 2 can use the frame material F without waste similarly to the previous embodiment, and can improve the material yield and the manufacturing cost.
- the frame 2 of the fuel cell stack shown in FIG. 7 has a rectangular shape, and has one protrusion 11 on each of the four sides.
- the protrusion 11 in the illustrated frame 2 has a width that is slightly shorter than the total length of each side. In the illustrated example, there is a portion without the protruding portion 11 in the vicinity of the corner portion of the frame main body 2A, but the protruding portion 11 can be provided over the entire length of each side.
- the frame 2 constitutes the single cell C and further constitutes the laminated body A, and the short-circuit of the single cell C can be prevented by the protrusion 11 as in the previous embodiments.
- the fuel cell stack can cover most of the end surfaces of the separators 3 and 4 with the protrusions 11 by adopting the frame 2, and most of the gap between the end surfaces of the separators 3 and 4 and the case 50.
- the protruding portion 11 is interposed.
- the fuel cell stack more reliably prevents contact between the separators 3 and 4 of the single cell C, and contact between the end face of the separators 3 and 4 and the case 50, and reliably prevents short circuit of the single cell C. To get.
- the frame 2 of the fuel cell stack shown in FIG. 8A has three projecting portions 11 on one long side and 4 on the other long side, as in the fifth embodiment (see FIG. 5). It has two protrusions 11, and also has a protrusion 11 at the center of both short sides.
- the frame 2 is bent in at least one row of the protruding portions 11 of the protruding portions 11 arranged in the stacking direction of the single cells C. However, it is different from the bending direction of the protrusions 11 in the other rows.
- the protrusions 11 in the central row of the three protrusions 11 are bent downward in the figure, and the protrusions 11 in the rows on both sides thereof. Is bent upward in the figure.
- the first and third rows of projections 11 of the four projections 11 are bent upward in the drawing, and the second and fourth rows of projections 11. Is bent downward in the figure.
- one short-side protruding portion 11 is bent upward in the drawing, and the other short-side protruding portion 11 is bent downward in the drawing.
- the fuel cell stack having the above-described configuration can prevent the single cell C from being short-circuited by the protrusions 11 as in the previous embodiment. Further, in the fuel cell stack, by changing the folding direction of the protrusions 11 arranged in the stacking direction in units of columns, the reaction force of the bent protrusions 11 is individually obtained in the state where the stacked body A is accommodated in the case 50. It is possible to act on the single cell C in a well-balanced manner, and to prevent the deformation of the frame 2 more reliably.
- the fuel cell stack FS shown in FIG. 9A includes a frame-like case 51 that houses the stacked body A.
- the case 51 includes a first case member 52 and a second case member 53 combined therewith.
- the first case member 52 includes a vertical face plate 52A, a bottom plate 52B, and a side frame portion 52C.
- the second case member 53 includes a top plate 53A and a front frame portion 53B that faces the face plate 52A.
- the stacked body A in which the stacking direction of the single cells C is set up and down is arranged on the bottom plate 52 B of the first case 52, and the second case member 53 is combined with the first case member 52.
- the case 51 holds the upper and lower surfaces of the laminate A between the top plate 53A and the bottom plate 52B, and holds the front and back surfaces of the laminate A between the face plate 52A and the front frame portion 53B.
- the side surface of the laminate A is held by the frame portion 52C.
- the frame 2 of each single cell C has the same form.
- the first and second frames 21 and 22 having different arrangements are employed.
- the frame 21 shown on the upper side in FIG. 9B has three protrusions 11 on both long sides of the frame body 21A, and one protrusion 11 on the center of both short sides. have.
- the frame 22 shown on the lower side in FIG. 9B has four protrusions 11 on both long sides of the frame body 22A, and one protrusion 11 on the center of both short sides. Yes.
- the width dimension W1 of the long-side protrusion 11 is substantially the same, and the interval W2 between the long-side protrusions 11 is substantially the same as the width W1 of the protrusion 11. It is.
- the fuel cell stack FS has a configuration in which the single cells C having the first frames 21 and the single cells C having the second frames 22 are alternately stacked. Thereby, the first and second frames 21 and 22 in each single cell C are adjacent to each other between the protruding portions 11 on the long side, as shown in a plan view in FIG. The protruding portion 11 is arranged.
- the case 51 is provided with a frame support 51H that maintains the protruding portion 11 of the frame 2 in a bent state with respect to the laminate A described above.
- the material and shape of the frame support 51H are not particularly limited, but more preferably an insulating member such as plastic can be used.
- the frame support portion 51H of this embodiment is a belt-like member fixed to the face plate 52A and the front frame portion 53B of the case 51 with bolts B as shown in FIG. 9A.
- the frame support 51H may be separate from the case 51 as shown, or may be integrated with the case 51.
- FIG. 9A four frame support portions 51H are illustrated, but actually, the frame support portions 51H are arranged corresponding to the number of the protruding portions 11 in the stacked body A.
- the fuel cell stack FS bends the protruding portion 11 of the first frame 21 downward in the drawing by the frame support portion 51H of the case 51, and maintains the bent state. .
- the fuel cell stack FS is bent in the upward direction in the drawing by the other frame support portion 51H of the case 51 so that the bent state is obtained.
- 10B and 10C are cross-sectional views based on the AA line and the BB line in FIG. 10A, and only the protruding portion 11 in each cross section is shown by a solid line. The protrusion 11 on the back side is indicated by a broken line.
- the fuel cell stack FS having the above-described configuration can prevent the single cell C from being short-circuited by the protrusions 11 as in the previous embodiment, and the bending direction of the protrusions 11 can be varied in units of columns. At least the uneven deformation of the frame 2 is more reliably prevented. Moreover, since the fuel cell stack FS maintains the protruding portion 11 of the frame 2 in a bent state by the frame support portion 51H, the short-circuit prevention function by the protruding portion 11 can be reliably maintained over a long period of time.
- the first and second frames 21 and 22 are alternately arranged on the frame material (F) illustrated in FIGS. 5 and 6 with no gaps because the arrangement of the protrusions 11 on the long sides is staggered. It is possible to cut out from the same frame material F.
- the fuel cell stack FS having the above-described configuration can be attached to the frame support portion 51H before and after the stack A is accommodated in the case 51. That is, the frame support portion 51H is provided in advance on the case 51 side, and thereafter, the stacked body A is moved and accommodated in the stacking direction. Thereby, the laminated body A is accommodated while the protrusion 11 is bent by the frame support 51H, and the bent state of the protrusion 11 is maintained after the accommodation.
- the laminated body A is accommodated at a predetermined position of the case 51, and then the frame support part 51H is inserted into the arrangement position of the protrusion part 11, whereby the protrusion part 11 is bent and the frame support part 51H is fixed to the case 51.
- the bent state of the protruding portion 11 is maintained.
- the case 51 is provided with a frame support 51H in advance at the arrangement position of the protrusions 11 to be bent upward, and the laminated body. A is accommodated from the upper side, and the protruding portion 11 is bent upward. Thereafter, the frame support portion 51H is inserted into the arrangement position of the remaining protrusions 11, and the protrusions 11 of the array are bent downward.
- the configuration of the fuel cell stack according to the present invention is not limited to the above-described embodiments, and the details of the configurations may be changed as appropriate without departing from the gist of the present invention. It is possible to combine them appropriately.
- a Stack C Single cell F Frame material FS Fuel cell stack 1 Membrane electrode assembly 2 Frame 2A Frame body 3, 4 Separator 11 Projection 11A Bending portion 21 First frame 21A Frame body 22 Second frame 22A Frame body 50 Case 51 Case 51H Frame holder
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Abstract
Description
図1(A)に示す燃料電池スタックFSは、矩形状の単セルCを複数枚積層して積層体Aを構成している。積層体Aの積層方向の一端部(図中で右端部)には、集電板54A及びスペーサ55を介してエンドプレート56Aが配置してあり、積層体Aの積層方向の他端部には、集電板54Bを介してエンドプレート56Bが配置してある。
図3に示す燃料電池スタックFSは、各単セルCにおけるフレーム2が、その外周部に突出部11を有すると共に、セパレータ3,4の外周部に、下向き(又は上向き)に折り曲げた屈曲部3A,4Aが設けてある。図示例の屈曲部3A,4Aは、セパレータ3,4の両長辺の各々3箇所に形成してある。そして、屈曲部3A,4Aは、単セルCを積層した状態では、単セルCの下部セパレータ4の屈曲部4Aが、その下側に隣接する単セルCの上部セパレータ3の屈曲部3Aの外側を覆うように係合している。
図4は、フレーム2における突出部11の他の形態を説明する図である。
突出部11には、様々な形状や曲げ部11Aを採用することができる。図4(A)に示す突出部11は、先の実施形態で説明したものと同様に、矩形状を成し、その基部に曲げ部11Aを有するものである。図4(B)に示す突出部11は、三角形状を成し、その基部に曲げ部11Aを有するものである。
図5に示す燃料電池スタックのフレーム2は、フレーム本体2Aが、矩形状を成しており、少なくとも平行な二辺のうちの一方の辺における突出部11と、他方の辺における突出部11とが、互い違いに配置してある。
図6に示す燃料電池スタックのフレーム2は、フレーム本体2Aが矩形状を成し、両長辺に突出部11を有している。図示例のフレーム2は、両長辺に7つの突出部11を隙間無く配置したもので、各突出部11が、先端を斜辺とする台形状を成しており、一方の長辺の突出部11の斜辺と、他方の長辺の突出部11の斜辺とが平行になっている。
図7に示す燃料電池スタックのフレーム2は、矩形状を成し、四辺に夫々1つずつの突出部11を有している。図示例のフレーム2における突出部11は、各辺の全長よりも若干短い幅寸法を有している。なお、図示例では、フレーム本体2Aの角部近傍に突出部11の無い部分があるが、突出部11を各辺の全長にわたって設けることも可能である。
図8(A)に示す燃料電池スタックのフレーム2は、第5実施形態のもの(図5参照)と同様に、一方の長辺に3つの突出部11を有し、他方の長辺に4つの突出部11を有しており、さらに、両短辺の中央にも突出部11を有している。
図9(A)に示す燃料電池スタックFSは、積層体Aを収容するフレーム状のケース51を備えている。前記ケース51は、第1ケース部材52と、これに組み合わされる第2ケース部材53を備えている。第1ケース部材52は、垂直な面板52A、底板52B、及び側面枠部52Cを有している。第2ケース部材53は、天板53Aと、面板52Aに相対向する正面枠部53Bを有している。
C 単セル
F フレーム素材
FS 燃料電池スタック
1 膜電極接合体
2 フレーム
2A フレーム本体
3,4 セパレータ
11 突出部
11A 曲げ部
21 第1フレーム
21A フレーム本体
22 第2フレーム
22A フレーム本体
50 ケース
51 ケース
51H フレーム保持部
Claims (8)
- 膜電極接合体の外周部を保持するフレームと、膜電極接合体及びフレームの両面側に配置した一対のセパレータとを備えた単セルを有し、前記単セルを複数枚積層して成る積層体と、前記積層体を収容するケースとを備えた燃料電池スタックであって、
フレームが、フレーム本体の外周部に、セパレータの外周端部よりも外側に突出する突出部を有し、
突出部が、少なくともフレームとセパレータの間隔よりも大きい突出長さを有し、且つフレーム本体に対して折り曲げ可能であることを特徴とする燃料電池スタック。 - フレームが、突出部の基部に、折り曲げを促進する加工を施した曲げ部を有す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。
- 突出部の突出長さが、折り曲げた状態において、隣接する単セルの突出部の少なくとも一部に重なる長さであ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。
- フレームが、フレーム本体の複数箇所に突出部を有しており、
単セルの積層方向に配列した突出部のうちの少なくとも一列の突出部の折り曲げ方向が、他列の突出部の折り曲げ方向と異なることを特徴とする請求項1~3のいずれか1項に記載の燃料電池スタック。 - フレーム本体が、矩形状を成しており、
少なくとも平行な二辺のうちの一方の辺における突出部と、他方の辺における突出部とが、互い違いに配置してあることを特徴とする請求項1~4のいずれか1項に記載の燃料電池スタック。 - 突出部が、フレーム本体の面内の重心に対して、点対称位置に配置してあることを特徴とする請求項1~5のいずれか1項に記載の燃料電池スタック。
- フレームが、連続するフレーム素材から切断したものであり、フレーム素材の連続方向に直交する辺に突出部が配置してあることを特徴とする請求項5又は6に記載の燃料電池スタック。
- ケースが、フレームの突出部を折り曲げ状態に維持するフレーム支持部を備えていることを特徴とする燃料電池スタック。
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JP7337730B2 (ja) | 2020-02-28 | 2023-09-04 | 本田技研工業株式会社 | 燃料電池スタック及びセパレータ |
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DE202020106459U1 (de) * | 2020-11-11 | 2022-02-16 | Reinz-Dichtungs-Gmbh | Anordnung für ein elektrochemisches System, Stapel sowie elektrochemisches System |
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