JP2007035296A - Electrolyte membrane/electrode assembly and cell of fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolyte membrane/electrode assembly suitable for attaching it to a separator; and to provide a cell of a fuel cell. <P>SOLUTION: This electrolyte membrane/electrode assembly 2 is provided with: support frames 7 jointed to a circumferential annular part of a reaction area 4A of a solid polymer electrolyte membrane 4 from both its surfaces; and gas diffusion layers 6 stacked by covering the reaction area 4A of the solid polymer electrolyte membrane 4. The support frame 7 is formed into a structure having at least two layers comprising the electrolyte membrane side 10 and the surface side 11 stacked and jointed on/to it. The surface-side support frame 11 is provided with areas 14 and 16 without arranging a constituent material of the surface-side support frame 11 so as to fit with jointing projections 27 projecting from a circumferential edge parts of the separator 3; and, in the areas 14 and 16, an adhesive or a pressure-sensitive adhesive for jointing the surface-side support frame 11 to the support frame 10 on the electrolyte membrane side is arranged by being so exposed attachably to the separator 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrolyte membrane / electrode laminate and a fuel cell, and more particularly to an electrolyte membrane / electrode laminate and a fuel cell suitable for integrating a support frame of an electrolyte membrane / electrode laminate and a separator by bonding. Is.

  Conventionally, there has been proposed a structure of a fuel cell in which a support frame of an electrolyte membrane / electrode laminate and separators on both sides are integrated with an adhesive (see Patent Document 1).

This is a fuel cell in which an adhesive seal is made by adhering a support frame to both surfaces of the outer periphery of the electrolyte membrane, catalyst layer, and diffusion layer, and adhering both surfaces of the support frame to a separator with an adhesive layer interposed It is said. Then, at the portion where the gasket surrounding the manifold opening of the gas and the refrigerant is disposed, the adhesive layer that adheres the support frame and the separator is not formed, and the stacking load when the cells are stacked to form the stack Creep deformation is prevented.
JP 2004-165125 A

  However, in the above-described conventional example, an adhesive layer coated with an adhesive is formed on the surface of the support frame and bonded to the separator. Therefore, a step of applying the adhesive to the surface of the support frame is required, and the adhesive layer The surface that does not form the substrate needs to have a shape raised by a weir or the like from the portion where the adhesive layer is formed, and the shape of the support frame becomes complicated.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an electrolyte membrane / electrode laminate and a fuel cell suitable for adhesion to a separator.

  The present invention relates to an electrolyte membrane / comprising a support frame joined from both sides to an outer peripheral annular portion of a reaction region of a solid polymer electrolyte membrane, and a gas diffusion layer laminated so as to cover the reaction region of the solid polymer electrolyte membrane It is an electrode laminate, and the support frame is configured in at least a two-layer structure of an electrolyte membrane side and a surface side laminated and bonded to the electrolyte membrane side, and the surface side support frame protrudes from the outer peripheral edge of the separator There is a region where the constituent material of the surface side support frame is not placed so as to fit with the adhesive, and in this region, an adhesive or an adhesive for joining the surface side support frame and the support frame on the electrolyte membrane side can be bonded to the separator It is placed exposed.

  Therefore, in the present invention, the support frame bonded from both sides to the outer peripheral annular portion of the reaction region of the solid polymer electrolyte membrane is configured in at least a two-layer structure of the electrolyte membrane side and the surface side laminated and bonded thereto. The surface side support frame is provided with a region where the constituent material of the surface side support frame is not disposed so as to be fitted with the joint protrusion protruding from the outer peripheral edge of the separator, and in this region, the surface side support frame and the electrolyte membrane side support frame are provided. Since the adhesive or the pressure-sensitive adhesive for bonding is exposed so as to be capable of bonding to the separator, the separator can be bonded and bonded without applying the adhesive again for bonding the separator.

  Hereinafter, the electrolyte membrane / electrode laminate and the fuel cell of the present invention will be described based on each embodiment.

(First embodiment)
1 to 3 show a first embodiment of an electrolyte membrane / electrode laminate and a fuel cell to which the present invention is applied, FIG. 1 is a cross-sectional view of the fuel cell, and FIG. 2 is an electrolyte membrane of the first example. FIG. 3 is a cross-sectional view of the electrolyte membrane / electrode laminate according to the second embodiment.

  In FIG. 1, a fuel cell 1 in this embodiment includes an electrolyte membrane / electrode laminate 2 in which an electrode catalyst 5 and a gas diffusion layer 6 (hereinafter referred to as GDL) are laminated on both surfaces of an electrolyte membrane 4, and While sandwiching the electrolyte membrane / electrode laminate 2, an oxidant gas such as air is supplied to the oxidant electrode side through the supply flow path 3A, while a fuel gas such as hydrogen is supplied to the fuel electrode side in the supply flow path 3B. And a pair of separators 3 each formed of a relatively corrosion-resistant metal material such as stainless steel.

  The electrolyte membrane / electrode laminate 2 is a pair of frame-shaped members made of, for example, a resin, which is adhered to both the solid polymer electrolyte membrane 4 and the peripheral edge of the solid polymer electrolyte membrane 4 by adhesion. A support frame 7; an oxidant electrode catalyst (catalyst layer) 5A and a fuel electrode catalyst (catalyst layer) 5B, which are disposed in contact with the surface of the electrolyte membrane 4 (reaction region 4A) surrounded by each support frame 7; And GDL 6 that covers each electrode catalyst 5 and is joined from each upper surface.

  Since the support frame 7 is integrated so that the periphery of the electrolyte membrane 4 is sandwiched from both sides, the support membrane 7 has a reinforcing function to reinforce the electrolyte membrane 4 and is reinforced by the support frame 7. Can be prevented from wrinkling and breakage in the handling process and easy to handle. The support frame 7 has a two-layer structure of an inner support frame 10 joined to an electrolyte membrane and an outer support frame 11 on the surface side, and the inner and outer support frames 10 and 11 are bonded with an adhesive interposed therebetween.

  As shown in FIG. 2, the outer support frame 11 is separated into an inner ring portion 12 and an outer ring portion 13, and an annular gap region 14 having a preset width is formed between the ring portions 12 and 13. In this gap region 14, the adhesive 15 for bonding the inner and outer support frames 10 and 11 is exposed. The inner circumferential annular portion 12 surrounds one of the refrigerant manifold 20 and the gas manifold 21 and is located on the manifold side and has an annular gap region 16 having a width set in advance with respect to the inner circumferential annular portion. The manifold forming portion 17 is formed to be separated, and the adhesive 15 for bonding the inner and outer support frames 10 and 11 is also exposed to the gap region 16. Although not shown, the surface of the adhesive 15 exposed in the gap regions 14 and 16 formed on the outer support frame 11 is covered with a protective film such as a film that suppresses drying / curing of the adhesive 15, and the adhesive 15 This prevents a decrease in adhesive strength.

  The type of resin used for the support frame 7 is not particularly limited, but the inner support frame 10 that contacts the solid polymer electrolyte membrane may include, for example, Nafion as the solid polymer electrolyte membrane 4. When the perfluorosulfonic acid type polymer membrane is used, acid resistance is required because it shows strong acidity in a water-containing state. Moreover, the high temperature state around 60-100 degreeC and the stability with respect to a steam are also required. The adhesive or pressure-sensitive adhesive for joining the inner support frame 10 and the outer support frame 11 may be any type as long as it has a function of joining the metal separator 3 and the inner support frame 10. However, it is preferable that it does not have hydrolysis, ion elution into water, thermal decomposition under the operating temperature of the fuel cell, and reaction gas permeability.

  The separator 3 is formed of a metal having excellent corrosion resistance, such as a stainless alloy, and a flow path rib 25 that forms a flow path 3A (3B) for supplying fuel gas or oxidant gas to the CDL 6 is an electrolyte. The film 4 is arranged at equal intervals over the entire reaction region 4A to form a waveform cross-sectional shape. At the peripheral edge of the separator 3 facing the support frame 7, there is a flat part 26 that contacts the surface of the inner peripheral annular part 12 of the outer support frame 11, and there is an outer periphery of the flat part 26 from the flat part 26. Ribs 27 (adhesive ribs) that protrude and enter the annular gap regions 14 and 16 are formed. The outer peripheral side of the bonding rib 27 is separated from the electrolyte membrane / electrode laminate 2 again and returned to the height of the portion constituting the bottom of the gas flow paths 3A and 3B. The outer peripheral side is a flat flange 28. Is formed. The height of the bonding rib 27 from the flat portion 26 is formed substantially the same as the plate thickness of the outer support frame 11. Further, the width W1 of the bonding rib 27 is formed larger than the width W2 of the flow path rib 25.

  On the surface of the metal separator 3, there is a problem in the case of using a metal material, that is, corrosion is likely to occur in the atmosphere in the fuel cell, an increase in electric resistance, deterioration of the electrolyte membrane 4 due to elution of metal ions, etc. In order to overcome this problem, for example, a noble metal composite plating film in which fluororesin or fluorinated graphite particles are co-deposited is formed. Thereby, the contact resistance is low, the water repellency of the gas flow path 3A (3B) is excellent, good gas flowability is ensured, and the corrosion resistance is also excellent.

  The plate thickness of the outer support frame 11 is such that when the flat portion 26 at the periphery of the separator 3 is pressed against the GDL 6, the gas flow ribs 25 constituting the gas flow channel 3 </ b> A (3 </ b> B) can be It is set to a dimension that enables crushing with an optimal porosity.

  In the fuel cell 1 having the above configuration, the protective sheet covering the adhesive 15 exposed in the gap regions 14 and 16 of the outer support frame 11 of the electrolyte membrane / electrode laminate 2 is peeled off, and the electrolyte membrane / electrode laminate is removed. When the separators 3 are arranged on both surfaces of the body 2, the flow path ribs 25 of the separator 3 come into contact with the surface of the GDL 6 arranged in the reaction region 4 </ b> A, and the flat portion 26 on the outer peripheral side of the separator 3 is formed on the outer support frame 11. Adhesive ribs 27 facing the surface of the inner peripheral annular portion 12 and on the outer peripheral side of the flat portion 26 are inserted into the gap regions 14 and 16 of the outer support frame 11.

  When the three members are pressed in the laminating direction, the flat portion 26 at the periphery of the separator 3 comes into contact with the surface of the inner peripheral annular portion 12 of the outer support frame 11, and in this state, the plate thickness of the outer support frame 11 is the gas thickness. The GDL 6 is crushed with the optimal porosity for gas diffusion and the contact resistance with the separator 3 is reduced by the flow path ribs 25 constituting the flow path 3A (3B).

  Further, since the plate thickness of the outer support frame 11 and the height of the bonding rib 27 are the same, at the time when the flat portion 26 around the separator 3 contacts the surface of the inner peripheral annular portion 12 of the outer support frame 11, The tip surface of the bonding rib 27 comes into contact with and is pressed against the adhesive exposed in the gap regions 14 and 16. In this case, the load in the laminating direction is received by the contact surface between the bonding rib 27 and the inner support frame 10 and the contact surface between the flat surface portion 26 and the surface of the inner peripheral annular portion 12, and the GDL 6 is more than the flow path. The ribs 25 are prevented from being crushed. The tip end surface of the bonding rib 27 is bonded to the inner support frame 10 with an adhesive, whereby sealing between the inner side and the outer side of the bonding rib 27 is performed, and an annular gap around each manifold 20, 21. The manifolds 20 and 21 are sealed by an unillustrated bonding rib 27 bonded to the adhesive 16.

  Further, since the width W1 of the bonding rib 27 of the separator 3 is larger than the width W2 of the flow path rib 25, it is possible to prevent a sealing failure due to the deformation of the bonding portion. That is, in order to reduce the contact resistance, it is necessary to apply a load in the stacking direction of a certain level or more to the flow path rib 25. At this time, the width W1 of the bonding rib 27 of the bonding portion is set to the flow path rib 25. By making it larger than the width W2, it is possible to prevent deterioration of the sealing performance due to deformation or breakage of the electrolyte membrane 4 or the support frame 7 or deformation of the bonding rib 27 due to an excessive load.

  The fuel cells 1 formed as described above are stacked in a predetermined number with a plurality of refrigerant separators sandwiched between them, with a terminal and an insulator interposed at the stacking end and an end plate disposed at the end. The fuel cell stack is configured by being compressed in the direction by stud bolts or the like.

  In the electrolyte membrane / electrode laminate 2 of the second embodiment shown in FIG. 3, the inner support frame 10 and the outer support frame 11 are both formed in the same shape. The outer support frame 11 is subjected to a cut process 30 (perforation, cut band) or a half cut process at a boundary portion between the inner peripheral annular part 12 and the outer peripheral annular part 13 and the gap area 14 therebetween, so that the gap area 14 is formed. It is possible to cut the constituent members of the outer support frame 11 located in a strip shape. Similarly, a cut 30 (perforation, cut band) or a half cut is applied to surround either one of the refrigerant manifold 20 and the gas manifold 21 with a predetermined width in an annular shape. The constituent members of the outer support frame 11 can be cut into a strip shape.

  In the electrolyte membrane / electrode laminate 2, when assembling the fuel battery cell 1 in combination with the separator 3, first, the constituent materials of the gap portions 14 and 16 are removed in a band shape along the cuts 30 of the outer support frame 11. Then, the adhesive is exposed in a groove shape. Thereafter, each separator 3 is aligned, and if the tip of the bonding rib 27 of the separator 3 is brought into contact with the exposed adhesive and pressed, the separator 3 and the electrolyte membrane / electrode laminate 2 are integrated by the adhesive. The fuel battery cell 1 can be assembled.

  If the adhesive used for bonding the support frames 10 and 11 of the electrolyte membrane / electrode laminate 2 is cured in a short time, the outer support frame 11 cannot be removed in a strip shape, so that the curing time is somewhat. It is desirable to use a long adhesive. In addition, when the viscosity of the adhesive is low, it is expected that the adhesive will flow out from between the support frames 10 and 11 or the sealing performance at the time of bonding to the tip end surface of the bonding rib 27 of the separator 3 is inferior. It is necessary to select a viscous adhesive.

  In the present embodiment, the following effects can be achieved.

  (A) a support frame 7 joined from both sides to the outer peripheral annular portion of the reaction region 4A of the solid polymer electrolyte membrane 4, a gas diffusion layer 6 laminated so as to cover the reaction region 4A of the solid polymer electrolyte membrane 4, The support frame 7 is configured to have at least a two-layer structure of an electrolyte membrane side 10 and a surface side 11 laminated and bonded thereto, and the surface side support frame 11 includes: The surface side support frame 11 and the electrolyte membrane side are provided in the regions 14 and 16 in which the constituent members of the surface side support frame 11 are not disposed so as to be fitted with the joint protrusions 27 protruding from the outer peripheral edge of the separator 3. Since the adhesive or pressure-sensitive adhesive for bonding the support frame 10 to the separator 3 is disposed so as to be capable of bonding to the separator 3, the separator 3 can be connected without applying the adhesive again for bonding the separator 3. It can be to bonding.

  (A) The adhesive or pressure-sensitive adhesive that is exposed in the regions 14 and 16 of the front-side support frame 11 is protected by a peelable protective member, thereby suppressing a decrease in the adhesive strength of the adhesive. it can.

  (C) The regions 14 and 16 where the constituent members of the surface-side support frame 11 of the surface-side support frame 11 are not disposed are the surface-side support frame 11 that has been subjected to a cut 30 or a half-cut process at the boundary between the regions 14 and 16. The support frame 10 is joined to the support frame 10 on the electrolyte membrane side, or the boundary between the regions 14 and 16 of the surface-side support frame 11 in the joined state is subjected to a cut process 30 or a half-cut process. By removing and forming the frame constituent material along the cut or half cut, the surface side support frame 11 is usually a thin sheet of 500 [μm] or less, and is peeled off along the cut 30 or half cut. Thus, the adhesive can be exposed, and the assemblability of the fuel cell 1 can be improved.

  (D) An electrolyte in which a support frame 7 is joined from both sides to the outer peripheral annular portion of the reaction region 4A of the solid polymer electrolyte membrane 4 while a gas diffusion layer 6 is laminated so as to cover the reaction region 4A of the solid polymer electrolyte membrane 4 In the fuel cell 1 comprising the membrane / electrode laminate 2 and the separator 3 laminated on both sides of the electrolyte membrane / electrode laminate 2 and having an outer peripheral edge bonded to the support frame 7 by adhesion. 7 is configured to have at least a two-layer structure of an electrolyte membrane side 10 and a surface side 11 laminated and bonded thereto, and is fitted to the surface side support frame 11 with a bonding protrusion 27 protruding from the outer peripheral edge of the separator 3. The regions 14 and 16 where the constituent material of the surface side support frame 11 is not disposed are provided, and the adhesives or pressure-sensitive adhesives for bonding the surface side support frame 11 and the support frame 10 on the electrolyte membrane side to these regions 14 and 16. To expose The separator 3 and the electrolyte membrane / electrode laminate 2 are bonded to each other by bonding the electrolyte membrane / electrode laminate 2 and the joint protrusion 27 protruding from the outer peripheral edge of the separator 3 with the adhesive or adhesive of the regions 14 and 16. Not only can be joined, but also a gas sealing function can be effectively exhibited at the joined portion. That is, rather than adhering to the flat portion 26 at the periphery of the separator 3, the bonding rib 27 is formed by the bonding protrusion, so that when the cells 1 are stacked as a stack and a load is applied in the stacking direction, The lamination load can be applied, and the sealing function can be improved.

  (E) The width of the bonding protrusion 27 protruding from the outer peripheral edge of the separator 3 is larger than the width of the rib 25 between the gas flow paths 3A and 3B formed in the separator 3 so as to supply the reaction gas to the reaction region 4A. Then, in order to reduce the sealing failure due to the deformation of the adhesion part, that is, the contact resistance between the GDL 6 and the separator 3, it is necessary to apply a certain load to the reaction flow path rib 25. By making the width of the rib 27 larger than that of the reaction flow path rib 25, it is possible to prevent the electrolyte membrane 4 and the support frame 7 from being deformed or damaged by an excessive load, or the sealing performance from being lowered due to the deformation of the rib 27.

  (F) The height of the joining protrusion 27 projecting from the outer peripheral edge of the separator 3 was formed to be equal to the plate thickness of the front-side support frame 11 and joined to the electrolyte membrane / electrode stack 2 as the fuel cell 1. When the compression allowance of the gas diffusion layer 6 disposed in the reaction region 4A by the rib 25 between the gas flow paths 3A and 3B of the separator 3 is set, it is possible to determine the optimum amount of GDL 6 to be crushed. Become. If the amount of crushing of the GDL 6 is small, that is, if the surface pressure applied to the GDL 6 is small, the contact resistance generated between the separator 3 and the GDL 6 is increased and the power generation performance is lowered. On the other hand, when GDL6 is crushed too much, the gas permeability of GDL6 and the drainage of water will fall, and this will also lead to the fall of power generation performance.

(Second Embodiment)
FIG. 4 is a cross-sectional view of a fuel cell showing a second embodiment of an electrolyte membrane / electrode stack and a fuel cell to which the present invention is applied. In this embodiment, the exchange of the electrolyte membrane / electrode laminate is facilitated. In addition, the same code | symbol is attached | subjected to the same member as FIGS. 1-3, and the description is abbreviate | omitted or simplified.

  In FIG. 4, in the fuel cell 1 of the present embodiment, the electrolyte membrane / electrode laminate 2 is configured to be bonded and sealed to one separator 3 by adhesion similarly to the first embodiment, The other separator 31 is sealed with a gasket 32 without being bonded.

  The gasket 32 may be fixedly disposed on either the separator 31 or the outer support frame 11. The gasket 32 is positioned in the region where the bonding ribs 27 of the other separator 3 are disposed, so that the stacking load is bonded by interposing the gasket 32 applied when the fuel cell stack is formed by cell stacking. The contact between the ribs 27 and the adhesive is strengthened, and the airtightness of the bonded portion is improved.

  In addition, when the back surface of the separator 3 bonded to the support frame 7 of the electrolyte membrane / electrode laminate 2 is bonded to the adjacent separator 33 and the space 34 formed between the separators is filled with an adhesive and sealed, it is adjacent. A temperature adjusting medium or the like can flow through the flow path 35 formed between the separator 33 and the separator 33.

  In this embodiment, when the electrolyte membrane / electrode stack 2 needs to be replaced, the fuel cell 1 of the relevant portion is separated from the portion where the gasket 32 is present on the separator 31 side and the electrolyte membrane / electrode stack 2. Then, the electrolyte membrane / electrode laminate 2 bonded to each other can be separated at the bonded portion and removed. Thereafter, the adhesive remaining on the front end surface of the bonding rib 27 of the separator 3 that has been bonded is removed by cleaning, and the electrolyte membrane / electrode laminate 2 prepared for replacement is bonded to complete the replacement. To do. When the separators 3 on both sides and the electrolyte membrane / electrode laminate 2 are bonded, it is necessary to cut off the bonding site between the separators 3 on both sides.

  In the present embodiment, in addition to the effects (a) to (f) in the first embodiment, the following effects can be achieved.

  (G) One of the separators 3 and 31 (31) is joined via the gasket 32 between the support frame 7 and the peripheral edge of the separator 31 so that the electrolyte membrane / electrode laminate 2 can be replaced. It becomes easy.

1 is a cross-sectional view of a fuel cell showing an embodiment of the present invention. The top view of the electrolyte membrane / electrode laminated body of 1st Example similarly. Similarly, sectional drawing of the electrolyte membrane / electrode laminated body of 2nd Example. Sectional drawing of the fuel battery cell which shows 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Electrolyte membrane / electrode laminated body 3, 31, 33 Separator 4 Electrolyte membrane 5 Catalyst layer 6 Gas diffusion layer, GDL
7 Support frame 10 Inner support frame 11 Outer support frame 12 Inner peripheral annular portion 13 Outer peripheral annular portion 14, 16 region, gap region 15 Adhesive or adhesive 20, 21 Manifold 25 Channel rib 26 Planar portion 27 Adhesive rib 32 gasket

Claims (7)

A support frame joined from both sides to the outer peripheral annular portion of the reaction region of the solid polymer electrolyte membrane;
An electrolyte membrane / electrode laminate comprising a gas diffusion layer laminated over the reaction region of the solid polymer electrolyte membrane,
The support frame is configured in an at least two-layer structure of an electrolyte membrane side and a surface side laminated and bonded thereto,
The surface-side support frame includes a region in which the constituent material of the surface-side support frame is not disposed so as to be fitted to the joint protrusion protruding from the outer peripheral edge of the separator, and in this region, the surface-side support frame and the electrolyte membrane side support frame An electrolyte membrane / electrode laminate for a fuel cell, wherein an adhesive or a pressure-sensitive adhesive for bonding to the separator is exposed so as to be able to adhere to the separator.   2. The electrolyte membrane / fuel cell of claim 1, wherein the adhesive or pressure-sensitive adhesive that is exposed in the region of the front-side support frame is protected by a peelable protective member. Electrode laminate.   In the region where the constituent material of the surface side support frame of the surface side support frame is not disposed, the surface side support frame subjected to the cut processing or the half cut processing at the boundary of the region is joined to the support frame on the electrolyte membrane side, or The boundary of the region of the surface-side support frame in the joined state is cut or half-cut, and the support frame constituent material in the region is removed along the cut or half-cut. The electrolyte membrane / electrode laminate of the fuel cell according to claim 1. An electrolyte membrane / electrode laminate in which a support frame is joined from both sides to an outer peripheral annular portion of a reaction region of a solid polymer electrolyte membrane, and a gas diffusion layer is laminated to cover the reaction region of the solid polymer electrolyte membrane, and an electrolyte membrane In a fuel cell comprising: a separator that is laminated on both sides of an electrode laminate and has an outer peripheral edge bonded to the support frame by bonding;
The support frame is configured in an at least two-layer structure of an electrolyte membrane side and a surface side laminated and bonded thereto,
The surface-side support frame is provided with a region in which the constituent material of the surface-side support frame is not disposed so as to be fitted to the joint protrusion protruding from the outer peripheral edge of the separator, and in this region, the surface-side support frame and the electrolyte membrane side support frame To expose the adhesive or adhesive to join
A fuel battery cell comprising: an electrolyte membrane / electrode laminate and a joining protrusion protruding from an outer peripheral edge of a separator by an adhesive or a pressure sensitive adhesive in the region.   The width of the joint protrusion protruding from the outer peripheral edge of the separator is formed larger than the rib width between the gas flow paths formed in the separator so as to supply the reaction gas to the reaction region. Fuel cell.   The height of the joint protrusion protruding from the outer peripheral edge of the separator is formed to be equal to the plate thickness of the front-side support frame, and when the fuel cell is joined to the electrolyte membrane / electrode laminate, the separator gas flow path 6. The fuel cell according to claim 4 or 5, wherein a compression allowance of a gas diffusion layer disposed in a reaction region by a rib therebetween is set.   The fuel cell according to any one of claims 4 to 6, wherein any one of the separators is joined between a support frame and a peripheral edge of the separator via a gasket.

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