JP2004241207A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hold the unit cell by a simple and compact structure and improve assembly workability. <P>SOLUTION: The unit cell 12 comprises a plurality of metal clamping members 70 for holding the outer periphery portion of a first and a second metal separators 24, 26 at two or more places. The metal clamping member 70 has a side part 72 and a first and a second locking parts 74, 76 which are flexed at both ends of this side part 72. The first and second locking parts 74, 76 penetrate the outer periphery end part of the first and second metal separators 24, 26 and are bent to the second metal separator 26 side, and hold the first and second metal separators 24, 26 and give a prescribed holding force to the whole unit cell 12. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuel cell including a unit cell in which an electrolyte / electrode structure in which a pair of electrodes are provided on both sides of an electrolyte is sandwiched between first and second separators.
[0002]
[Prior art]
For example, a polymer electrolyte fuel cell has an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode are respectively provided on both sides of a solid polymer electrolyte membrane composed of a polymer ion exchange membrane (cation exchange membrane). (Electrolyte / electrode structure) is provided with a unit cell sandwiched between a pair of separators.
[0003]
In this unit cell, a fuel gas supplied to the anode side electrode, for example, a gas mainly containing hydrogen (hereinafter also referred to as a hydrogen-containing gas) is ionized with hydrogen on the electrode catalyst, and is supplied to the cathode via the electrolyte membrane. Move to the side electrode side. The electrons generated during that time are taken out to an external circuit and used as DC electric energy. Since an oxidant gas, for example, a gas mainly containing oxygen or air (hereinafter also referred to as an oxygen-containing gas) is supplied to the cathode side electrode, hydrogen ions, electrons, And oxygen react to produce water.
[0004]
By the way, a fuel cell usually forms a stack by stacking tens to hundreds of unit cells. At this time, it is necessary to accurately position each unit cell. For this reason, an operation of inserting a knock pin into a positioning hole formed in the unit cell is performed. However, as the number of stacked unit cells increases, it becomes difficult to insert a knock pin, and the workability is reduced. In addition, there is a problem that the member is likely to be displaced and the sealing function is reduced. .
[0005]
Therefore, in order to solve the above problem, the techniques disclosed in Patent Literature 1 and Patent Literature 2 are adopted. As shown in FIG. 8, the fuel cell 1 of Patent Document 1 includes a unit cell 2 and separators 3a and 3b arranged with the unit cell 2 interposed therebetween. The unit cell 2 includes a solid polymer electrolyte membrane 2a, an anode 2b provided on one surface of the solid polymer electrolyte membrane 2a, and a cathode 2c provided on the other surface of the solid polymer electrolyte membrane 2a. It is configured.
[0006]
The fuel cell 1 has a retaining pin insertion retaining hole 4 penetrating in the stacking direction, and the separator 3b has a retaining ring insertion retaining hole 5 formed therein. The retaining pin 6 is inserted into the retaining pin insertion retaining hole 4, and a retaining ring 7 arranged in the retaining ring inserting retaining hole 5 is attached to the retaining ring insertion groove 6 a of the retaining pin 6. . The tip of the holding pin 6 is provided with a chamfered pin tip 6b, while the rear end of the holding pin 6 has an insertion hole 6c into which the pin tip 6b of another holding pin 6 is fitted. Is formed.
[0007]
In such a configuration, the retaining pin 6 is inserted into the retaining pin insertion retaining hole 4 of the fuel cell 1 and the retaining ring 7 is inserted from the retaining ring insertion retaining hole 5. When the retaining ring 7 is fitted into the retaining ring insertion groove 6a of the holding pin 6, the fuel cell 1 is held in a stacked state.
[0008]
At this time, the pin tip 6b of the holding pin 6 protrudes from the outer surface of the separator 3b. Therefore, the positioning of the fuel cells 1 adjacent to each other is performed by fitting the pin tip 6b into the insertion hole 6c of the holding pin 6 holding another fuel cell 1.
[0009]
Further, as shown in FIG. 9, in the fuel cell of Patent Document 2, terminal electrodes 9a and 9b are arranged on a pair of opposed side surfaces of a unit cell 8 having a rectangular column shape. The terminal electrode 9a is electrically connected to the anode electrode 2b, while the terminal electrode 9b is electrically connected to the cathode electrode 2c. Crimping members 9c and 9d are arranged on the other pair of opposing side surfaces of the unit cell 8, and the unit cell 8 is crimped and fixed via the crimping members 9c and 9d and the terminal electrodes 9a and 9b.
[0010]
[Patent Document 1]
JP-A-2000-120767 (paragraph [0016], FIG. 1)
[Patent Document 2]
JP-A-7-29580 (paragraphs [0017] and [0020], FIG. 2)
[0011]
[Problems to be solved by the invention]
However, in the above-described Patent Document 1, a plurality of holding pins 6 are inserted into the holding pin insertion holding holes 4 for each unit cell 2, and the retaining rings 7 are fitted into retaining ring insertion grooves 6 a of the retaining pins 6. Work is needed. For this reason, in particular, when a large number of unit cells 2 are stacked, the assembling work of the retaining pin 6 and the retaining ring 7 becomes considerably complicated, and a problem that the workability is reduced is pointed out. Furthermore, a large number of holding pins 6 and retaining rings 7 must be prepared, which raises a problem that the manufacturing cost is increased and it is not economical.
[0012]
Further, in Patent Document 2 described above, the terminal electrodes 9a and 9b and the crimping members 9c and 9d have two tongues TP shorter than the main body plate BP, and the unit cells 8 are held by the tongues TP. are doing. Therefore, there is a possibility that the unit cell 8 may not be securely held, and there is a problem that the terminal electrodes 9a and 9b and the crimp members 9c and 9d are easily detached from the unit cell 8.
[0013]
In addition, since the terminal electrodes 9a and 9b and the crimp members 9c and 9d cover the entire periphery of the unit cell 8, they become considerably large and heavy. In addition, when the unit cells 8 are to be stacked, there is a problem that the tongue pieces TP overlap each other in the stacking direction, and the dimension in the stacking direction becomes long.
[0014]
An object of the present invention is to solve this kind of problem, and an object of the present invention is to provide a fuel cell which has a simple and compact structure, can securely hold a unit cell, and has excellent assembling workability.
[0015]
[Means for Solving the Problems]
The fuel cell according to claim 1 of the present invention includes a plurality of metal stoppers that hold the outer circumferences of the first and second separators at a plurality of locations. A metal stopper member, a side portion disposed on the first separator side, and a locking portion bent at both ends of the side portion and bent on the second separator side after penetrating the first and second separators. Is provided.
[0016]
For this reason, the metal stopper can firmly and reliably hold the first and second separators by the side portions and the locking portions, and the metal stopper separates from the first and second separators. Can be effectively prevented.
[0017]
In addition, the unit cells can be efficiently assembled, the number of assembling steps is significantly reduced, and a reduction in sealing performance is not caused when the unit cells are handled, so that handling efficiency is effectively improved. . At that time, in the unit cell, the electrolyte / electrode structure is sandwiched between the first and second separators, the electrolyte / electrode structure can be maintained in a moist state, and the electrolyte / electrode structure is dried. This prevents the unit cell from deteriorating in performance. Furthermore, it is only necessary to use a metal stopper member, so that the configuration is simplified and the size and weight of the entire fuel cell can be easily reduced.
[0018]
Further, the fuel cell according to claim 2 of the present invention includes first and second unit cells stacked on each other, and a metal stopper member attached to the first unit cell and a metal stopper attached to the second unit cell. The stop member and the stop member are arranged so as to be shifted from each other in the stacking direction. Therefore, in the state where the first and second unit cells are stacked, the metal stoppers do not overlap each other, and the dimension of the entire fuel cell in the stacking direction can be reduced as much as possible.
[0019]
Further, in the fuel cell according to claim 3 of the present invention, the first and second separators include a metal plate, and an outer peripheral edge of the metal plate is insulated corresponding to a portion where the metal stopper contacts. An insulating portion made of resin or insulating coating is provided, and a hole is formed corresponding to a portion through which the locking portion penetrates. Thus, with a simple and inexpensive configuration, the metal plate does not come into contact with the metal stopper, and the first and second separators can be effectively prevented from being short-circuited to ensure a desired power generation function. Will be possible.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic configuration diagram of a fuel cell 10 according to a first embodiment of the present invention.
[0021]
The fuel cell 10 includes unit cells 12, and a plurality of unit cells 12 are stacked in the direction of arrow A to form a stacked body 14. Outside the laminate 14, terminal plates 16a, 16b, insulating plates 18a, 18b, and end plates 20a, 20b are sequentially arranged. The fuel cell 10 is configured by fastening the end plates 20a and 20b with a tie rod or the like (not shown).
[0022]
As shown in FIG. 2, the unit cell 12 includes an electrolyte membrane / electrode structure (electrolyte / electrode structure) 22, and first and second metal separators 24 and 26 that sandwich the electrolyte membrane / electrode structure 22. Is provided.
[0023]
One end edge of the unit cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, which is the laminating direction, to form an oxidant gas supply passage 30a for supplying an oxidant gas, for example, an oxygen-containing gas. A cooling medium discharge communication hole 32b for discharging the medium and a fuel gas discharge communication hole 34b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided in an arrow C direction (vertical direction).
[0024]
The other end edges of the unit cells 12 in the direction of arrow B are connected to each other in the direction of arrow A to provide a fuel gas supply communication hole 34a for supplying a fuel gas and a cooling medium supply communication hole for supplying a cooling medium. 32a and an oxidizing gas discharge communication hole 30b for discharging the oxidizing gas are arranged in the arrow C direction.
[0025]
The electrolyte membrane / electrode structure 22 includes, for example, a solid polymer electrolyte membrane 36 in which a thin film of perfluorosulfonic acid is impregnated with water, an anode electrode 38 and a cathode electrode 40 sandwiching the solid polymer electrolyte membrane 36. (See FIGS. 1 and 2).
[0026]
The anode electrode 38 and the cathode electrode 40 include a gas diffusion layer made of carbon paper or the like, and an electrode catalyst layer in which porous carbon particles having a platinum alloy supported on the surface are uniformly applied on the surface of the gas diffusion layer. Having. The electrode catalyst layers are joined to both surfaces of the solid polymer electrolyte membrane 36 so as to face each other with the solid polymer electrolyte membrane 36 interposed therebetween.
[0027]
As shown in FIG. 2, the surface 24a of the first metal separator 24 facing the electrolyte membrane / electrode structure 22 has an oxidant gas flow communicating with the oxidant gas supply passage 30a and the oxidant gas discharge passage 30b. A path 42 is provided. The oxidizing gas channel 42 includes, for example, a plurality of grooves extending in the direction of arrow B.
[0028]
A fuel gas flow path 44 communicating with the fuel gas supply passage 34a and the fuel gas discharge passage 34b is formed on a surface 26a of the second metal separator 26 facing the electrolyte membrane / electrode structure 22. The fuel gas passage 44 includes, for example, a plurality of grooves extending in the direction of arrow B.
[0029]
As shown in FIG. 2, between the surface 24b of the first metal separator 24 and the surface 26b of the second metal separator 26, the cooling medium flow communicating with the cooling medium supply communication hole 32a and the cooling medium discharge communication hole 32b. A passage 46 is formed. The cooling medium flow path 46 extends in the direction of arrow B and is integrally formed by overlapping a plurality of grooves provided in the first and second metal separators 24 and 26.
[0030]
On both surfaces 24a and 24b of the first metal separator 24, a first seal member (insulating resin) 50 is provided integrally by, for example, molding. The first seal member 50 is formed so as to surround the oxidizing gas passage 42 on the surface 24a and communicate the oxidizing gas passage 42 with the oxidizing gas supply passage 30a and the oxidizing gas discharge passage 30b. Is done. The first seal member 50 is formed on the surface 24b so as to surround the coolant passage 46 and communicate the coolant passage 46 with the coolant supply passage 32a and the coolant discharge passage 32b.
[0031]
As shown in FIG. 1, a bent end portion 52 that is bent in a direction away from the electrolyte membrane / electrode structure 22 is provided on an outer peripheral edge portion of the first metal separator 24. The first sealing member 50 has an insulating portion 54 surrounding the bent end 52.
[0032]
On both surfaces 26a and 26b of the second metal separator 26, a second seal member 58 is integrally provided, for example, by molding. The second seal member 58 surrounds the fuel gas flow path 44 on the surface 26b, and connects the fuel gas flow path 44 to the fuel gas supply communication hole 34a and the fuel gas discharge communication hole 34b. The second seal member 58 surrounds the cooling medium flow path 46 on the surface 26b, and connects the cooling medium supply communication hole 32a and the cooling medium discharge communication hole 32b to the cooling medium flow path 46.
[0033]
As shown in FIG. 1, a bent end portion 60 that bends in a direction away from the electrolyte membrane / electrode structure 22 is provided on the outer peripheral edge of the second metal separator 26, and the second seal member 58 An insulation site 62 is provided surrounding the end 60.
[0034]
The bent end portions 52 and 60 of the first and second metal separators 24 and 26 are bent in different directions (separating directions), so that the rigidity of the outer peripheral portions of the first and second metal separators 24 and 26 is increased. improves. The outer peripheries of the first and second metal separators 24 and 26 constituting the unit cell 12 are held at a plurality of locations by a plurality of metal stopper members 70 described later.
[0035]
As shown in FIG. 3, on the outer periphery of the unit cell 12, stop member attaching portions 64a to 64k are provided at predetermined positions, respectively. The stop member mounting portion 64a is provided with a first position 66a and a second position 66b so that the two metal stop members 70 can be selectively mounted in the width direction (the direction of arrow B).
[0036]
As shown in FIG. 4, the first and second metal separators 24 and 26 are provided with two holes 68a and 68b coaxially corresponding to the first position 66a, respectively, and correspond to the second position 66b. Thus, two holes 69a and 69b are provided coaxially. The stop member attachment portions 64b to 64k are provided with a first position 66a and a second position 66b to which two metal stop members 70 can be selectively attached, similarly to the above-described stop member attachment portion 64a (see FIG. 3). ).
[0037]
As shown in FIG. 4, the metal stopper 70 is formed by bending a metal wire (or bar), and includes a side portion 72 and first and second bent portions at both ends of the side portion 72. The locking portions 74 and 76 are integrally provided. The cross-sectional dimensions of the first and second locking portions 74, 76 are smaller than the opening dimensions of the holes 68a, 69a and 68b, 69b of the first and second metal separators 24, 26. And the second locking portions 74 and 76 are prevented from contacting the first and second metal separators 24 and 26.
[0038]
Next, an operation of assembling the fuel cell 10 configured as described above will be described below.
[0039]
First, as shown in FIG. 2, the first and second metal separators 24 and 26 are overlapped with the electrolyte membrane / electrode structure 22 interposed therebetween. In this state, as shown in FIG. 3, the metal stopper 70 is attached to each of the first positions 66a of the stopper attaching portions 64a to 64k.
[0040]
Specifically, as shown in FIG. 5, a substantially U-shaped metal stopper 70 is prepared. At the first position 66a, a height adjusting shim 78 is attached between the first and second metal separators 24 and 26. In this state, the first and second locking portions 74 and 76 constituting the metal stopper 70 are inserted into the first position 66a.
[0041]
It is preferable that, for example, a symbol such as an arrow or a pattern such as a circle is written in the first and second positions 66a and 66b in order to clearly indicate the insertion position. In addition, a hole may be formed so as to integrally pass through the first and second positions 66a and 66b.
[0042]
When the first and second locking portions 74 and 76 are inserted into the first position 66a, the tips 74a and 76a of the first and second locking portions 74 and 76 are bent in directions approaching each other (FIG. 5). See the middle and two-dot chain lines). For this reason, the side part 72 of the metal stopper 70 is disposed on the first metal separator 24 side, while the first and second locking parts 74 and 76 are bent toward the second metal separator 26 side. Thereafter, the height adjusting shim 78 is removed from between the first and second metal separators 24 and 26 (see FIG. 4).
[0043]
Therefore, the outer peripheral edges of the first and second metal separators 24 and 26 can be firmly and reliably held by the metal stopper 70. In addition, it is possible to effectively prevent the metal stopper 70 from detaching from the first and second metal separators 24 and 26, and the unit cells 12 can be reliably integrated.
[0044]
Thereby, in the first embodiment, the holding force of the first and second metal separators 24 and 26 is improved satisfactorily, and when the unit cell 12 is handled, the sealing performance is not reduced. Workability is effectively improved.
[0045]
In addition, it is only necessary to mount the metal stopper 70 at each first position 66a. Therefore, it is possible to efficiently assemble the unit cells 12, to reduce the number of assembling steps, and to perform an economical and easy assembling operation. Moreover, in the unit cell 12, the electrolyte membrane / electrode structure 22 is sandwiched between the first and second metal separators 24 and 26, so that the electrolyte membrane / electrode structure 22 can be maintained in a moist state. The drying of the electrolyte membrane / electrode structure 22 is prevented, and the performance of the unit cell 12 is not reduced.
[0046]
When assembling the metal stopper 70 at each first position 66a, a height adjusting shim 78 is inserted between the first and second metal separators 24 and 26. Therefore, when the metal stopper 70 is assembled, the first and second metal separators 24 and 26 can be effectively prevented from being deformed.
[0047]
Further, first and second seal members 50 and 58 are provided to cover the outer peripheral edges of the first and second metal separators 24 and 26, and the insulating portions 54 of the first and second seal members 50 and 58 are provided. A metal stopper 70 is attached to 62. At this time, two holes 68a, 68b and 69a, 69b are coaxially provided in the first and second metal separators 24, 26 corresponding to the first and second positions 66a, 66b, respectively.
[0048]
Accordingly, with a simple and inexpensive configuration, the metal stopper 70 does not directly contact the first and second metal separators 24 and 26, and the first and second metal separators 24 and 26 are short-circuited to each other. And a desired power generation function can be secured.
[0049]
Next, the other unit cells 12 stacked on the unit cell 12 are assembled. Here, in the other unit cells 12, the metal stopper members 70 are attached to the second positions 66b of the stopper member attachment portions 64a to 64k (see FIG. 6). Further, in another unit cell 12 stacked on the other unit cell 12, a metal stopper 70 is attached to each of the first positions 66a of the stopper attaching portions 64a to 64k.
[0050]
For this reason, in the unit cells 12 stacked on each other, the metal stoppers 70 attached to each other are arranged so as to be shifted from each other in the laminating direction, and the metal stoppers 70 do not overlap (FIG. 1). Thereby, an effect is obtained that the dimension of the stacked body 14 in the stacking direction can be shortened as much as possible.
[0051]
As described above, after a predetermined number of unit cells 12 are stacked in the direction of arrow A to form a stacked body 14, terminal plates 16a and 16b, insulating plates 18a and 18b, and end plates 20a and 20b are provided. Then, the fuel cells 10 are assembled by tightening the end plates 20a and 20b with a tie rod (not shown) or the like.
[0052]
The operation of the fuel cell 10 configured as described above will be described below.
[0053]
As shown in FIG. 1, in a fuel cell 10, a fuel cell such as an oxidizing gas which is an oxygen-containing gas such as air, a fuel gas such as a hydrogen-containing gas, etc. A cooling medium such as pure water, ethylene glycol or oil is supplied.
[0054]
For this reason, as shown in FIG. 2, in each unit cell 12, an oxidizing gas is introduced into the oxidizing gas passage 42 of the first metal separator 24 from the oxidizing gas supply passage 30a, and the oxidizing gas is It moves along the cathode electrode 40 of the membrane / electrode structure 22. The fuel gas is introduced from the fuel gas supply passage 34a into the fuel gas flow path 44 of the second metal separator 26, and moves along the anode 38 of the electrolyte membrane / electrode structure 22.
[0055]
Therefore, in the electrolyte membrane / electrode structure 22, the oxidizing gas supplied to the cathode electrode 40 and the fuel gas supplied to the anode electrode 38 are consumed by the electrochemical reaction in the electrode catalyst layer, and the power is generated. Is performed.
[0056]
Next, the oxidant gas supplied to and consumed by the cathode electrode 40 is discharged in the direction of arrow A along the oxidant gas discharge communication hole 30b. Similarly, the fuel gas supplied to the anode 38 and consumed is discharged in the direction of arrow A along the fuel gas discharge communication hole 34b.
[0057]
Further, the cooling medium supplied to the cooling medium supply passage 32a is introduced into the cooling medium flow path 46 between the first and second metal separators 24 and 26, and then flows along the arrow B direction. This cooling medium is discharged from the cooling medium discharge communication hole 32b after cooling the electrolyte membrane / electrode structure 22.
[0058]
In the first embodiment, the first and second seal members 50 and 58 are used for the first and second metal separators 24 and 26, but the present invention is not limited to this. May be applied. Further, instead of the first and second metal separators 24 and 26, for example, a carbon plate may be used.
[0059]
FIG. 7 is an explanatory perspective view of a metal stopper 80 constituting a fuel cell according to a second embodiment of the present invention.
[0060]
The metal stopper 80 is made of a thin metal plate, and has a side portion 82 and first and second locking portions 84 and 86 that are bent at both ends of the side portion 82. The metal stopper member 80 is formed in a substantially U-shape in advance, and after the first and second locking portions 84 and 86 are inserted into the first position 66a or the second position 66b, the first and second locking portions 84 and 86 are inserted. The ends 84a, 86a of the second locking portions 84, 86 are bent in a direction approaching each other.
[0061]
As a result, in the second embodiment, the same effects as in the first embodiment can be obtained, for example, the first and second metal separators 24 and 26 can be firmly and reliably held via the metal stopper member 80. can get.
[0062]
【The invention's effect】
In the fuel cell according to the present invention, the metal stopper can firmly and securely hold the first and second separators by the side portions and the locking portions. 2 can be effectively prevented from separating from the separator.
[0063]
In addition, the unit cells can be efficiently assembled, the number of assembling steps is significantly reduced, and a reduction in sealing performance is not caused when the unit cells are handled, so that handling efficiency is effectively improved. . Furthermore, it is only necessary to use a metal stopper member, so that the configuration is simplified and the size and weight of the entire fuel cell can be easily reduced.
[Brief description of the drawings]
FIG. 1 is a schematic structural explanatory view of a fuel cell according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a unit cell constituting the fuel cell.
FIG. 3 is an explanatory front view of the unit cell.
FIG. 4 is an explanatory perspective view of a metal stopper.
FIG. 5 is an explanatory view of an operation of attaching the metal stopper.
FIG. 6 is an explanatory perspective view when each unit cell is stacked.
FIG. 7 is a perspective explanatory view of a metal stopper member constituting a fuel cell according to a second embodiment of the present invention.
FIG. 8 is an explanatory diagram of a fuel cell of Patent Document 1.
FIG. 9 is an explanatory perspective view of a fuel cell disclosed in Patent Document 2.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Fuel cell 12 ... Unit cell 14 ... Laminated body 22 ... Electrolyte membrane / electrode structure 24, 26 ... Metal separator 36 ... Solid polymer electrolyte membrane 38 ... Anode side electrode 40 ... Cathode side electrode 42 ... Oxidant gas flow path 44: fuel gas flow path 46: cooling medium flow path 50, 58 ... seal members 52, 60 ... bent ends 54, 62 ... insulating parts 64a to 64k ... stop member mounting parts 66a, 66b ... positions 68a, 68b, 69a, 69b ... holes 70, 80 ... metal stoppers 72, 82 ... side parts 74, 76, 84, 86 ... locking parts

Claims (3)

A fuel cell including a unit cell in which an electrolyte / electrode structure in which a pair of electrodes are provided on both sides of an electrolyte is sandwiched between first and second separators,
A plurality of metal stoppers for holding the outer periphery of the first and second separators at a plurality of locations,
The metal stopper member, a side portion disposed on the first separator side,
A locking portion that is bent at both ends of the side portion and is bent at the second separator side after penetrating the first and second separators;
A fuel cell comprising: The fuel cell according to claim 1, further comprising a first and a second unit cell stacked on each other,
A fuel cell, wherein the metal stopper attached to the first unit cell and the metal stopper attached to the second unit cell are arranged so as to be shifted from each other in the stacking direction. The fuel cell according to claim 1, wherein the first and second separators include a metal plate,
An outer peripheral edge of the metal plate is provided with an insulating portion made of an insulating resin or insulating coating corresponding to a portion where the metal stopper member contacts,
A fuel cell, wherein a hole is formed corresponding to a portion through which the locking portion penetrates.

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