JP2006164659A - Fuel battery cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel battery cell capable of handling a fuel battery cell with an electrode/electrolyte membrane assembly arranged between separators integrally as an assembled component, and capable of improving assembling property of a fuel battery cell stack with good productivity, by realizing both sealing of an electrode/electrolyte membrane assembly peripheral edge part and integration of the electrode/electrolyte membrane assembly with the separators with the same member. <P>SOLUTION: The fuel battery cell is provided with a junction 4 formed by successively laminating an anode collector, anode catalyst layer, electrolyte membrane, cathode catalyst layer and cathode collector; a pair of separators 1, 2 set in opposition pinching the junction and formed in a manner of more expanding than the junction in an opposing direction; and resin 5 injected in a gap between enlarged parts 1a, 1b for jointing the junction and the separators. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel cell using a polymer electrolyte membrane, and more particularly to its structure.

Prior art
In a conventional fuel cell, for example, as shown in Patent Document 1 “Fuel Cell Separator Assembly Seal Structure”, a space portion is provided so as to communicate with a plurality of separators sandwiching a reaction electrode portion, and a rubber portion is provided in the space portion. The plurality of separators are integrated with each other by injection molding a molding material made of liquid rubber or thermoplastic elastomer. In such a configuration, it is possible to integrally handle the plurality of separators sandwiching the electrode / electrolyte membrane assembly as an assembled part, and to improve the assemblability of the fuel cell stack, Are listed.

Prior art 2.
Further, in another conventional fuel cell, for example, as shown in Patent Document 2 “Polymer electrolyte type fuel cell seal structure and manufacturing method thereof”, an anode current collector, an anode catalyst layer, an ion exchange membrane, A sealant is integrated so as to overlap a current collector having a five-layer structure including a cathode catalyst layer and a cathode current collector. In such a configuration, the number of parts when stacking the cell stack can be reduced, the setting can be made reliably, the mechanical strength can be increased even when the film thickness is thin, and the gas is pressurized. However, it is described that the gas leakage at the seal portion can be eliminated and the output can be improved.

JP 2001-338673 A (18th to 19th paragraphs, FIGS. 1 and 3) JP-A-8-45517 (6th paragraph, FIGS. 2 and 3)

However, in the prior art 1, the seal at the periphery of the reaction electrode portion (electrode / electrolyte membrane assembly) is formed by attaching a rubber elastic material gasket to the periphery of the enlarged electrolyte membrane in the electrode / electrolyte membrane assembly. The integration of the electrode / electrolyte membrane assembly and the separator is achieved by injection molding of the molding material into the space that communicates with the plurality of separators. More realized.
As described above, the sealing of the peripheral portion of the electrode / electrolyte membrane assembly and the integration of the electrode / electrolyte membrane assembly and the separator are performed in separate steps. Therefore, the number of processes cannot be reduced, and improvement in assemblability cannot be expected so much. In addition, applying a liquid rubber cured product to the peripheral edge of the electrolyte membrane also requires management of the application amount and application conditions, which hinders improvement in assemblability.

Further, in Patent Document 2, the seal at the periphery of the current collector (electrode / electrolyte membrane assembly) is realized by using a seal material and integrating the seal material so that the seal material overlaps around the electrode / electrolyte membrane assembly. The integration of the electrode / electrolyte membrane assembly and the separator is realized by applying an adhesive or a liquid rubber sealing material at the time of stacking the cell stack, fastening the cell stack, and then performing a curing process. .
Thus, the integration of the electrode / electrolyte membrane assembly and the separator is performed at the time of stacking the cell stack, and since the electrode / electrolyte membrane assembly and the separator are separate components at the time of stacking the cell stack, A lot of man-hours are required for fuel cell assembly (cell stack lamination). Furthermore, the use of an adhesive or liquid rubber sealant when stacking cell stacks increases the number of assembly steps and requires management of the coating amount and coating conditions. The effect of improving the assemblability by integrating the electrode with the electrode / electrolyte membrane assembly cannot be expected.

  The present invention has been made in order to solve the above-described problems of the prior art, and can integrally handle a fuel cell in which an electrode / electrolyte membrane assembly is arranged between separators as an assembled part, A fuel cell capable of improving the assembly of the fuel cell stack is realized by simultaneously using the same member to seal the periphery of the electrode / electrolyte membrane assembly and the integration of the electrode / electrolyte membrane assembly and the separator. Therefore, it aims at providing with good productivity.

  A fuel cell according to the present invention includes a joined body in which an anode current collector, an anode catalyst layer, an electrolyte membrane, a cathode catalyst layer, and a cathode current collector are sequentially laminated (hereinafter referred to as an electrode / electrolyte membrane joined body). A pair of separators that are disposed opposite to each other with the electrode / electrolyte membrane assembly sandwiched therebetween, and have an enlarged formation portion that is enlarged in the opposing surface direction than the electrode / electrolyte membrane assembly, and an enlargement of the pair of separators The resin is injected into the gap between the forming portions and includes a resin that joins the electrode / electrolyte membrane assembly and the separator.

  According to the present invention, since the resin is injected into the gap between the enlarged formation portions of the paired separator and the electrode / electrolyte membrane assembly and the separator are joined, the electrode / electrolyte membrane assembly is disposed between the separators. A fuel cell that can handle a fuel cell as an assembled part and can improve the assemblability of a fuel cell stack is obtained by combining a seal at the periphery of an electrode / electrolyte membrane assembly and an electrode / electrolyte membrane assembly. Can be provided with good productivity by simultaneously realizing the integration of the separator and the separator with the same member.

Embodiment 1 FIG.
1-3 is a figure for demonstrating the fuel battery cell by Embodiment 1 of this invention, More specifically, FIG. 1 is a longitudinal cross-sectional view which shows the structure of a fuel battery cell, FIG. 2 is a fuel. FIG. 3 is a plan view of a fuel cell as viewed from one separator (cathode side separator) side. 1 is a cross-sectional view taken along line AA ′ of FIG.

The fuel battery cell according to the present embodiment includes an electrode / electrolyte membrane assembly 4, separators (anode side and cathode side separators) 1 and 2 and a resin 5.
The electrode / electrolyte membrane assembly 4 includes an anode current collector, an anode catalyst layer (in FIG. 1, the anode current collector and the anode catalyst layer are indicated by 4a), an electrolyte membrane 4b, a cathode catalyst layer, and a cathode current collector. (In FIG. 1, the cathode catalyst layer and the cathode current collector are indicated by 4c.) Are sequentially laminated.

The separators 1 and 2 forming a pair are arranged to face each other with the electrode / electrolyte membrane assembly 4 interposed therebetween, and are opposed to the electrode / electrolyte membrane assembly 4 (the direction parallel to the opposing surface of the paired separators 1 and 2). ) Is enlarged. That is, each separator 1, 2 is formed slightly larger than the electrode / electrolyte membrane assembly 4.
The anode-side separator 1 is provided with an anode gas flow path (hereinafter also referred to as a fuel flow path) 3a for flowing fuel to a surface adjacent to the electrode / electrolyte membrane assembly 4 and on the opposite surface. A cooling flow path (hereinafter also referred to as a cooling water flow path) 3b for flowing a cooling fluid such as cooling water is provided. Further, the cathode separator 2 is provided with a cathode gas flow path (hereinafter also referred to as an air flow path) 3 c for flowing an oxidant such as air on the surface adjacent to the electrode / electrolyte membrane assembly 4. ing.
Further, as shown in FIGS. 1 and 3, the enlarged formed portions 1a and 2a of the separators 1 and 2 forming a pair of opposingly arranged pairs are connected to the manifolds so as to communicate with each other between the separators 1 and 2. A through-hole 6 for a mold is provided.

  The resin 5 is injected into the gap between the enlarged formation portions 1a and 2a of the separators 1 and 2 formed around the electrode / electrolyte membrane assembly 4 to connect the electrode / electrolyte membrane assembly 4 and the separators 1 and 2 together. It is joined and integrated.

  As described above, in this embodiment, the electrode / electrolyte is injected by injecting the resin 5 into the gap between the enlarged formation portions 1a and 2a of the separators 1 and 2 formed around the electrode / electrolyte membrane assembly 4. Since the membrane assembly 4 and the separators 1 and 2 are joined and integrated, the fuel cell in which the electrode / electrolyte membrane assembly 4 is arranged between the separators 1 and 2 can be handled as an assembled part. Assembling property of the fuel cell stack can be improved. Further, by integrating, the sealing property becomes good and the reliability can be improved. Furthermore, the seal at the periphery of the electrode / electrolyte membrane assembly 4 and the integration of the electrode / electrolyte membrane assembly 4 and the separators 1 and 2 can be realized simultaneously with the same member, and the fuel cell can be simplified. It can be provided in the manufacturing process. That is, the productivity of the fuel cell is improved.

Further, in the present embodiment, as shown in FIGS. 1 and 3, the enlargement forming portions 1a and 2a of the opposing separators 1 and 2 are connected to the integration through holes 7 so as to communicate with each other. And the resin 5 is also injected into the through hole 7 for integration. Thereby, the adhesiveness with the separators 1 and 2 of the resin 5 can be improved, and the electrode / electrolyte membrane assembly 4 and the separators 1 and 2 can be reliably integrated.
In addition, although the figure has shown the case where the through-hole 7 for integration which penetrates the separators 1 and 2 is provided, it does not need to penetrate the separators 1 and 2. In short, it is only necessary to provide space portions so as to communicate with the enlarged formation portions 1a and 2a of the separators 1 and 2 forming a pair opposed to each other.

Further, at least a part 7 a of the integration through hole (space portion) 7 is formed such that the opening cross-sectional area thereof is larger on the side farther from the side closer to the opposing surfaces of the separators 1 and 2. This part 7a is called an undercut part. Thereby, it is possible to prevent the resin 5 from coming off from the through holes (space portions) 7 for integrating the separators 1 and 2, and the electrode / electrolyte membrane assembly 4 and the separators 1 and 2 can be more reliably integrated. it can.
In addition, the shape of the undercut part 7a is not restricted to a cone shape as shown in the figure, but may be a stepped shape. In the figure, the undercut portion 7a is provided at the end of the integration through hole (space portion) 7, but may be provided in the middle.
Also, in the figure, both the through holes for integration (space portions) 7 provided in the enlarged formation portion 1a and the through holes for integration both of the through holes for integration (space portions) 7 provided in the enlarged formation portion 2a are shown. Although the case where the undercut part 7a is provided in the hole (space part) 7 is shown, the undercut part 7a may be provided only in one integration through hole (space part) 7.

  Further, in the present embodiment, the surfaces of the separators 1 and 2 that are in contact with the resin 5 are provided with irregularities (in FIG. 1, the concave portions 8, but may be convex portions or both concave portions and convex portions). It has been. Thereby, the adhesiveness with the separators 1 and 2 of the resin 5 can be improved, and the electrode / electrolyte membrane assembly 4 and the separators 1 and 2 can be reliably integrated.

  The resin includes olefin resin, styrene resin, polyester resin, polyamide resin, olefin thermoplastic elastomer, styrene thermoplastic elastomer, polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyvinyl chloride. A thermoplastic elastomer, a polyamide-type thermoplastic elastomer, etc. can be used. These resins have a tensile elastic modulus in order to achieve both good integration by securely bonding the electrode / electrolyte membrane assembly 4 and the separators 1 and 2 and good sealing performance by allowing minute deformation. It is desirable to be in the range of 1 MPa to 1000 MPa.

In particular, the hot water resistance can be improved by using any one or a mixture of an olefin resin, an olefin thermoplastic elastomer, and a styrene thermoplastic elastomer.
Examples of the olefin resin include polypropylene resin, high density polyethylene resin, low density polyethylene resin, and syndiotactic polypropylene resin.
Examples of the olefin-based thermoplastic elastomer include those having a soft segment of hydrogenated butadiene and ethylene propylene.
Styrenic thermoplastic elastomers include styrene / butadiene / styrene copolymers, styrene / hydrogenated butadiene / styrene copolymers, styrene / isoprene / styrene copolymers, styrene / hydrogenated isoprene / styrene copolymers, etc. Can be mentioned.

Next, the manufacturing method of the fuel cell according to the present embodiment will be described with reference to FIG.
First, as shown in FIG. 2A, the molds 9 and 10 of the vertical injection molding machine are opened, and the manifold through holes 6 are formed on the mold pins 13 whose cross section is the shape of the manifold through holes 6. Then, the anode separator 1 provided with the cooling water flow path 3b and the fuel flow path 3a is set in the mold 10. The mold pin 13 prevents the resin 5 from flowing into the manifold through hole 6 and also serves as a positioning pin.
Next, the electrode / electrolyte membrane assembly 4 is placed in the center of the anode-side separator 1, and the cathode-side separator 2 provided with the air flow path 3c is placed thereon.

  Next, as shown in FIG. 2B, the mold 9 is closed and, for example, a resin 5 heated to a predetermined temperature and melted is formed around the electrode / electrolyte membrane assembly 4 through the runner 11. The electrode / electrolyte membrane assembly 4 and the separator 1 are injected (injection molding) into the gap between the enlarged forming portions 1a and 2a of the separators 1 and 2 and taken out from the mold after cooling and separated by the gate portion 12. 2 are joined and integrated to obtain a fuel cell unit. In addition, when a thermosetting resin or rubber is used as the resin 5, the resin 5 is heated and cured after the resin is injected.

  In addition, although the injection molding using a thermoplastic resin was demonstrated above, it is not restricted to this, For example, transfer molding, LIM (Liquid Injection Molding) molding, RIM (Reaction Injection Molding) molding, etc., thermosetting resin and Rubber may be injected and molded.

Embodiment 2. FIG.
4 and 5 are diagrams for explaining a fuel cell according to Embodiment 2 of the present invention. More specifically, FIG. 4 is a longitudinal sectional view showing the configuration and manufacturing process of the fuel cell. 5 is a plan view of the fuel cell as viewed from one separator (cathode side separator) side. 4 is a cross-sectional view taken along line BB ′ of FIG.
In the following, differences from the first embodiment will be mainly described.

In the present embodiment, through-holes 6 for manifolds are provided in the enlarged formation portions 1a and 2a of the separators 1 and 2 that form a pair arranged opposite to each other so as to communicate with each other. 1 (cathode side separator 2 in FIG. 4) communicates with an integration through hole (space portion) 7 (more specifically, resin 5 injected into the integration through hole (space portion) 7). Then, the resin 5 is protruded so as to surround the manifold through-hole 6, and the manifold seal portion 14 is formed. Further, the other of the paired separators 1 and 2 (the anode side separator 1 in FIG. 4) is a seal receiving portion 15 at a position corresponding to the manifold seal portion 14 so as to surround the manifold through hole 6. Grooves are formed.
The groove that becomes the seal receiving portion 15 may be omitted.

  In such a structure, the manifold seal portion 14 can be formed simultaneously with the integration of the electrode / electrolyte membrane assembly 4 and the separators 1 and 2, so that a seal member such as an O-ring is formed later. This eliminates the need to install the fuel cell stack and improves the assembly of the fuel cell stack.

In the present embodiment, one of the paired separators 1 and 2 (cathode side separator 2 in FIG. 4) is provided with an integration through hole (space part) 7 (more specifically, integrated). The resin 5, which communicates with the resin 5) injected into the forming through hole (space part) 7, is disposed so as to surround the cooling flow path 3 b, and the cooling flow path seal portion 16 is formed. Further, the other of the paired separators 1 and 2 (the anode side separator 1 in FIG. 4) is provided with a seal receiving portion 17 at a position corresponding to the cooling flow path seal portion 16 so as to surround the cooling flow path 3b. A groove is formed.
The groove that becomes the seal receiving portion 17 may be omitted.

  In the structure configured as described above, the cooling flow path seal portion 16 can be formed simultaneously with the integration of the electrode / electrolyte membrane assembly 4 and the separators 1 and 2. There is no need to install a seal member, and the assembly of the fuel cell stack is further improved.

  Specific examples will be described below, but the present invention is not limited to these examples.

Example 1.
The fuel battery cell described in Embodiment 1 was produced as follows.
The electrode / electrolyte membrane assembly 4 is formed by coating the electrolyte membrane 4b (manufactured by Asahi Kasei Co., Ltd., trade name: Aciplex SF1002) with an anode catalyst paste and a cathode catalyst paste, respectively, and then drying the collector with a thickness of about 0.2 mm. It was sandwiched between carbon papers 4a and 4c to become and hot-pressed at 160 ° C. At this time, the electrolyte membrane 4b has the same size as the carbon papers 4a and 4c or protrudes from the carbon papers 4a and 4c. The amount of protrusion of the electrolyte membrane 4b from the carbon papers 4a and 4c was 2 mm or less. The obtained electrode / electrolyte membrane assembly 4 had a size of about 160 mm × 80 mm and a thickness of about 0.5 mm.
As the separators 1 and 2, molded separators in which graphite was highly filled in a thermosetting resin or a thermoplastic resin were used. When forming the separators 1 and 2, the gas flow paths 3 a and 3 c, the cooling flow path 3 b, the manifold through-hole 6, and the like were provided with the unevenness 8 and the integration through-hole 7 having the undercut portion 7 a. The size of the obtained anode side separator 1 was about 200 mm × 100 mm and the thickness was about 2 mm, and the size of the cathode side separator 2 was about 200 mm × 100 mm and the thickness was about 1.5 mm.

  After the anode-side separator 1, the electrode / electrolyte membrane assembly 4, and the cathode-side separator 2 are set in this order in the mold 10 shown in FIG. 2, the mold 9 is closed and the electrode / electrolyte membrane assembly 4 is placed around the electrode / electrolyte membrane assembly 4. A high-density polyethylene resin (Kyoyo Polyethylene Co., Ltd.), which is a kind of olefin resin, is formed in the gap between the enlarged forming portions 1a and 2a of the separators 1 and 2 (including the recess 8 and the through hole 7 for integration) Product name: KEIYO Polyethylene M6910) is injected and molded at a resin temperature of 220 ° C., a mold temperature of 40 ° C. and an injection time of 1 second, and after a cooling time of 20 seconds, it is removed from the molds 9 and 10 and the gate part The fuel cell shown in FIG.

The fuel cell thus produced is set on a test bench, and a N ₂ gas of 0.3 MPa in gauge pressure is allowed to flow through the gas flow path 3a or 3c on one electrode side, and gas leaks to the other electrode side. Upon inspection, no gas leak was observed.

Example 2
Although it is the same as that of Example 1, the normal polypropylene resin (Idemitsu Kosan Co., Ltd. make, brand name: IDEMITSU PP3056HP) which is a kind of olefin resin was used as the resin 5. Injection is performed at a resin temperature of 250 ° C., a mold temperature of 50 ° C., and an injection time of 1 second. After a cooling time of 20 seconds, the resin is taken out from the molds 9 and 10 and cut off at the gate portion 12 and fuel as shown in FIG. A battery cell was obtained.

The fuel cell thus produced is set on a test bench, and a N ₂ gas of 0.3 MPa in gauge pressure is allowed to flow through the gas flow path 3a or 3c on one electrode side, and gas leaks to the other electrode side. Upon inspection, no gas leak was observed.

Example 3
Although it is the same as that of Example 1, the syndiotactic polypropylene resin (The Exxon Chemical Co., Ltd. make, brand name: Achieve 1605) which is 1 type of olefin resin was used as resin. Injection is performed at a resin temperature of 250 ° C., a mold temperature of 50 ° C., and an injection time of 1 second. After a cooling time of 20 seconds, the resin is taken out from the molds 9 and 10 and cut off at the gate portion 12 and fuel as shown in FIG. A battery cell was obtained.

The fuel cell thus produced is set on a test bench, and a N ₂ gas of 0.3 MPa in gauge pressure is allowed to flow through the gas flow path 3a or 3c on one electrode side, and gas leaks to the other electrode side. Upon inspection, no gas leak was observed.

Example 4
The fuel cell described in Embodiment 2 was produced.
Same as Example 1, but when forming the separators 1 and 2, the gas flow paths 3 a and 3 c, the cooling flow path 3 b, the manifold through-hole 6, etc., as well as the unevenness 8 and the undercut portion 7 a are used for integration. A through hole 7, a groove for forming the manifold seal portion 14 and the cooling flow path seal portion 16, and grooves for forming the seal receiving portions 15 and 17 were provided.
Further, as the resin 5, a styrene-based elastomer (manufactured by Mitsubishi Chemical Corporation, trade name: Lavalon SJ8400B), which is a thermoplastic elastomer, was used. After the anode-side separator 1, the electrode / electrolyte membrane assembly 4, and the cathode-side separator 2 are set in this order in the mold 10 shown in FIG. 4, the mold 9 is closed and the electrode / electrolyte membrane assembly 4 is placed around the electrode / electrolyte membrane assembly 4. The gap formed between the enlarged forming portions 1a and 2a of the separators 1 and 2 (including the concave portion 8, the through hole 7 for integration, and the grooves for forming the manifold seal portion 14 and the cooling flow path seal portion 16 are formed. The resin 5 is injected and molded at a resin temperature of 220 ° C., a mold temperature of 40 ° C., and an injection time of 1 second. After a cooling time of 20 seconds, the resin 5 is taken out from the molds 9 and 10 and separated by the gate portion 12. Thus, a fuel battery cell as shown in FIG. 4 was obtained.

Ten fuel cells thus produced were stacked and set on a test bench, and a N ₂ gas of 0.3 MPa in gauge pressure was passed through the gas flow path 3a or 3c on one electrode side, and the other electrode The gas leak to the side was examined, but no gas leak was found.

Embodiment 5 FIG.
Although it is the same as that of Example 4, the olefin type elastomer (Aronkasei Co., Ltd. make, brand name: Elastomer AR-790) which is a thermoplastic elastomer was used for resin. Injection is performed at a resin temperature of 220 ° C., a mold temperature of 40 ° C., and an injection time of 1 second. After a cooling time of 20 seconds, the resin is taken out from the molds 9 and 10 and cut off at the gate portion 12 and fuel as shown in FIG. A battery cell was obtained.

Ten fuel cells thus produced were stacked and set on a test bench, and a N ₂ gas of 0.3 MPa in gauge pressure was passed through the gas flow path 3a or 3c on one electrode side, and the other electrode The gas leak to the side was examined, but no gas leak was found.

It is a longitudinal cross-sectional view which shows the structure of the fuel battery cell by Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the manufacturing process of the fuel battery cell by Embodiment 1 of this invention. It is the top view which looked at the fuel cell by Embodiment 1 of this invention from the one separator side. It is a longitudinal cross-sectional view which shows the structure and manufacturing process of the fuel cell by Embodiment 2 of this invention. It is the top view which looked at the fuel cell by Embodiment 2 of this invention from the one separator side.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Anode side separator, 1a Expansion formation part, 2 Cathode side separator, 2a Expansion formation part, 3a Anode gas flow path, 3b Cooling flow path, 3c Cathode gas flow path, 4 Electrode / electrolyte membrane assembly, 5 Resin, 6 Manifold Through hole, 7 Through hole for integration, 7a Undercut part, 8 Recess, 9, 10 Mold, 11 Runner, 12 Gate, 13 Mold pin, 14 Manifold seal part, 15 Seal receiving part, 16 Cooling flow Road seal part, 17 seal receiving part.

Claims (7)

A joined body in which an anode current collector, an anode catalyst layer, an electrolyte membrane, a cathode catalyst layer, and a cathode current collector are sequentially laminated;
A separator that forms a pair having an enlarged formation portion that is disposed oppositely across the joined body and is enlarged in the facing surface direction than the joined body,
A fuel cell comprising: a resin that is injected into a gap between the enlarged forming portions of the pair of separators and that joins the joined body and the separator.   2. The fuel cell according to claim 1, wherein a space portion is provided in the enlarged formation portion of the pair of separators so as to communicate with each other, and the resin is injected into the space portion.   3. The fuel cell according to claim 2, wherein at least one of the space portions is formed such that at least a part of the opening cross-sectional area thereof is larger on a side farther than a side closer to the opposing surface of the separator.   The fuel cell according to claim 1, wherein a surface of the separator in contact with the resin is provided with unevenness.   A manifold through hole is provided in the enlarged formation portion of the paired separator so as to communicate with each other, and one of the pair of separators communicates with the space portion and surrounds the manifold through hole. The fuel cell according to claim 2, wherein a resin sealing portion is formed to project the resin.   A cooling channel for flowing a cooling fluid is provided on a surface opposite to the surface adjacent to the joined body in at least one of the paired separators, and one of the paired separators includes a space portion and The fuel cell according to claim 2, wherein a resin is protruded and disposed so as to communicate and surround the cooling flow path to form a cooling flow path sealing portion.   2. The fuel cell according to claim 1, wherein the resin is at least one of an olefin resin, an olefin thermoplastic elastomer, and a styrene thermoplastic elastomer.