JP2010153175A - Fuel battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel battery capable of preventing a metal separator from deforming at a connecting passage side in a simple structure and securing a desired sealing property and gas circulation nature. <P>SOLUTION: An electrolyte membrane-electrode structure 16 intervenes between an anode side metal separator 18 and a cathode side metal separator 20 in a power generation cell 12 forming the fuel battery 10. An inlet connection passage 62a having a plurality of first elastic projecting member 60a for connecting between a fuel gas passage 44 and a fuel gas inlet communicating hole 34a is arranged on a surface 18a of the anode side metal separator 18. an outer seal 58c extending in a direction crossed with the first elastic projecting member 60a and third elastic projecting members 72a, 72a arranged in parallel with the outer seal 58c and being lower than the outer seal 58c are arranged on the surface 18b of the anode side metal separator 18 at a position corresponding to the inlet connection passage 62a of the fuel gas. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes an electrolyte / electrode structure in which a pair of electrodes are disposed on both sides of an electrolyte, the electrolyte / electrode structure is sandwiched between first and second metal separators, and at least a fuel gas, an oxidant gas, or A fuel cell in which a fluid flow path for flowing a fluid, which is one of the cooling media, in the surface direction of the electrolyte / electrode structure and a fluid communication hole for supplying the fluid in the stacking direction of the electrolyte / electrode structure are formed. About.

  For example, in a polymer electrolyte fuel cell, an electrolyte membrane / electrode structure (an electrolyte / electrode structure) in which an anode electrode and a cathode electrode are disposed on both sides of an electrolyte membrane (electrolyte) made of a polymer ion exchange membrane, respectively. ) (MEA) is sandwiched between separators. This type of fuel cell is used as a fuel cell stack in which a predetermined number of electrolyte membrane / electrode structures and separators are laminated.

  In the above fuel cell, a fuel gas channel (fluid channel) for flowing fuel gas (fluid) along the anode side electrode and an oxidant gas (fluid) along the cathode side electrode in the plane of the separator. ) And an oxidant gas flow path (fluid flow path).

  Further, a fuel gas inlet communication hole and a fuel gas outlet communication hole that are fluid communication holes that penetrate the separator in the stacking direction and communicate with the fuel gas flow path, and an oxidant gas flow path An oxidant gas inlet communication hole and an oxidant gas outlet communication hole, which are fluid communication holes communicating with each other, are formed.

  In addition, a cooling medium flow path (fluid flow path) for cooling the electrolyte membrane / electrode structure is provided between the separators, and a cooling medium inlet communication that penetrates in the stacking direction and communicates with the cooling medium flow path. A hole and a cooling medium outlet communication hole (fluid communication hole) are formed.

  For example, a solid polymer electrolyte fuel cell disclosed in Patent Document 1 includes a metal separator 1 as shown in FIG. The metal separator 1 has a hydrogen gas supply communication hole 2a, a cooling water supply communication hole 3a, and an air supply communication hole 4a formed at one end in the longitudinal direction, and an air discharge communication hole 4b at the other end in the longitudinal direction. A cooling water discharge communication hole 3b and a hydrogen gas discharge communication hole 2b are formed.

  A hydrogen gas channel (groove) 5 is provided on the hydrogen side of the metal separator 1, and the hydrogen gas channel 5 has a hydrogen gas supply communication hole 2 a and a hydrogen gas discharge communication hole 2 b through a resin convex portion 6 a. Communicating with On the other hand, an air flow path (groove portion) 7 is provided on the air side of the metal separator 1, and the air flow path 7 communicates with the air supply communication hole 4 a and the air discharge communication hole 4 b through the resin convex portion 6 b. is doing.

JP 2000-21418 A

  In the above-mentioned Patent Document 1, on the hydrogen side of the metal separator 1, the hydrogen gas supply communication hole 2a, the hydrogen gas discharge communication hole 2b, and the hydrogen gas flow path 5 communicate with each other through connection flow paths 8a and 8b. . On the other hand, on the air side of the metal separator 1, a part of the resin convex portion 6b is provided at a position corresponding to the connecting flow paths 8a and 8b.

  However, in particular, when a thin plate-like metal separator 1 and an electrolyte membrane / electrode structure are laminated and a tightening load is applied, the metal separator 1 is deformed so as to enter the connection flow paths 8a and 8b by a seal load. Easy to do. As a result, there is a problem that the desired sealing performance cannot be maintained, and the connecting flow paths 8a and 8b are narrowed so that the hydrogen gas does not flow well.

  The present invention solves this type of problem, and with a simple configuration, the metal separator is reliably prevented from being deformed to the connection flow path side and the connection flow path being narrowed. It aims at providing the fuel cell which can ensure gas flowability.

  The present invention includes an electrolyte / electrode structure in which a pair of electrodes are disposed on both sides of an electrolyte, the electrolyte / electrode structure is sandwiched between first and second metal separators, and at least a fuel gas, an oxidant gas, or A fuel cell in which a fluid flow path for flowing a fluid, which is one of the cooling media, in the surface direction of the electrolyte / electrode structure and a fluid communication hole for supplying the fluid in the stacking direction of the electrolyte / electrode structure are formed. It is about.

  One surface of the first metal separator is provided with a connection channel having a plurality of first elastic convex members to communicate between the fluid channel and the fluid communication hole. On the other surface, a second elastic convex member disposed in a direction intersecting the first elastic convex member at a position corresponding to the connecting flow path, and in parallel with the second elastic convex member; A third elastic convex member having a height lower than that of the second elastic convex member is provided.

  Further, the third elastic convex member is a long seal member which is arranged in parallel on both sides or one side of the second elastic convex member and continuously extends in a direction intersecting the first elastic convex member. It is preferable.

  Further, the third elastic convex member is a plurality of short seal members that are arranged in parallel to both sides or one side of the second elastic convex member and intermittently arranged in a direction intersecting the first elastic convex member. Preferably there is.

  Furthermore, the second elastic convex member is preferably a seal member integrally formed on the other surface of the first metal separator.

  According to the present invention, when the fuel cell is clamped in the stacking direction, the third elasticity in which the seal load generated by the clamping load applied to the second elastic convex member is arranged in parallel with the second elastic convex member. It is satisfactorily suppressed through the convex member. Therefore, it is possible to reliably prevent the first metal separator from being deformed to the connection flow path side and maintain a desired opening flow path cross-sectional area, simplifying the configuration, and achieving desired sealing performance and gas flow characteristics. Can be secured.

  FIG. 1 is an exploded perspective view of a main part of a power generation cell 12 constituting the fuel cell 10 according to the first embodiment of the present invention. FIG. 2 is a diagram in which a plurality of power generation cells 12 are stacked in the direction of arrow A. FIG. 2 is a cross-sectional explanatory view taken along the line II-II in FIG. 1 of the stacked fuel cell 10.

  As shown in FIG. 2, the fuel cell 10 has a plurality of power generation cells 12 stacked in the direction of arrow A, and end plates 14a and 14b are disposed at both ends in the stacking direction. The end plates 14a and 14b are fixed via tie rods (not shown), whereby a predetermined tightening load is applied to the stacked power generation cells 12 in the arrow A direction.

  As shown in FIG. 1, in the power generation cell 12, the electrolyte membrane / electrode structure 16 is sandwiched between an anode side metal separator (first metal separator) 18 and a cathode side metal separator (second metal separator) 20. . The anode-side metal separator 18 and the cathode-side metal separator 20 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a metal plate whose surface is subjected to anticorrosion treatment. Is set within a range of 0.05 mm to 1.0 mm, for example.

  One end edge of the power generation cell 12 in the direction of arrow B (horizontal direction in FIG. 1) communicates with each other in the direction of arrow A, which is the stacking direction, and discharges an oxidant gas (reactive gas), for example, an oxygen-containing gas. An oxidant gas outlet communication hole 30b for discharging the cooling medium, a cooling medium outlet communication hole 32b for discharging the cooling medium, and a fuel gas (reactive gas), for example, a fuel gas inlet communication hole 34a for supplying a hydrogen-containing gas, Arranged sequentially in the upward direction of the arrow C (vertical direction).

  The other end edge of the power generation cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, the fuel gas outlet communication hole 34b for discharging the fuel gas, and the cooling medium inlet communication hole for supplying the cooling medium. 32a and an oxidant gas inlet communication hole 30a for supplying an oxidant gas are provided sequentially arranged upward in the direction of arrow C.

  The electrolyte membrane / electrode structure 16 includes, for example, a solid polymer electrolyte membrane 36 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode side electrode 38 and a cathode side electrode 40 that sandwich the solid polymer electrolyte membrane 36. With. The anode side electrode 38 has a smaller surface area than the cathode side electrode 40.

  The anode side electrode 38 and the cathode side electrode 40 were formed by uniformly applying a gas diffusion layer made of carbon paper or the like and porous carbon particles having a platinum alloy supported on the surface thereof to the surface of the gas diffusion layer. An electrode catalyst layer. The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 36.

  As shown in FIGS. 1 and 3, on the surface 20a of the cathode-side metal separator 20 facing the electrolyte membrane / electrode structure 16, for example, an oxidant gas extending vertically downward while meandering in the arrow B direction. A flow path (reactive gas flow path) 42 is provided. The oxidant gas passage 42 communicates with the oxidant gas inlet communication hole 30a and the oxidant gas outlet communication hole 30b.

  As shown in FIG. 4, the surface 18a of the anode side metal separator 18 facing the electrolyte membrane / electrode structure 16 communicates with the fuel gas inlet communication hole 34a and the fuel gas outlet communication hole 34b, and in the direction of arrow B. A fuel gas flow path (reactive gas flow path) 44 extending in a vertically downward direction (arrow C direction) while meandering is formed.

  As shown in FIGS. 1 and 2, the surface 18b of the anode side metal separator 18 and the surface 20b of the cathode side metal separator 20 communicate with the cooling medium inlet communication hole 32a and the cooling medium outlet communication hole 32b. A cooling medium flow path 46 is formed. The cooling medium flow path 46 extends linearly in the direction of arrow B.

  As shown in FIGS. 1 and 3, the first seal member 50 is integrated with the surfaces 20 a and 20 b of the cathode side metal separator 20 around the outer peripheral end of the cathode side metal separator 20. For the first seal member 50, for example, a seal material such as EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroplane or acrylic rubber, a cushion material, or a packing material is used. It is done.

  As shown in FIGS. 2 and 3, the first seal member 50 is integrated with the first flat portion 52 integrated with the surface 20 a of the cathode side metal separator 20 and the surface 20 b of the cathode side metal separator 20. A second flat surface portion 54. The second plane part 54 is configured to be longer than the first plane part 52.

  As shown in FIGS. 1, 2, 4, and 5, the second seal member 56 wraps around the outer peripheral end of the anode side metal separator 18 on the surfaces 18 a and 18 b of the anode side metal separator 18. Integrated. The second seal member 56 includes an outer seal 58a provided on the surface 18a in the vicinity of the outer peripheral end of the anode side metal separator 18, and the inner seal 58b is spaced inward from the outer seal 58a by a predetermined distance. Is provided. The outer seal 58 a and the inner seal 58 b are provided on one surface of the second seal member 56 facing the anode side electrode 38.

  The outer seal 58a and the inner seal 58b can be selected from various cross-sectional shapes such as a tapered tip shape, a trapezoidal shape, or a bowl shape. The outer seal 58a is in contact with the first flat portion 52 provided on the cathode side metal separator 20, while the inner seal 58b is in direct contact with the solid polymer electrolyte membrane 36 constituting the electrolyte membrane / electrode structure 16. .

  As shown in FIG. 4, the outer seal 58a includes an oxidant gas inlet communication hole 30a, a cooling medium inlet communication hole 32a, a fuel gas outlet communication hole 34b, a fuel gas inlet communication hole 34a, a cooling medium outlet communication hole 32b, and an oxidant. The gas outlet communication hole 30b is surrounded. The inner seal 58b surrounds the fuel gas flow path 44, and an outer peripheral end portion of the electrolyte membrane / electrode structure 16 is disposed between the inner seal 58b and the outer seal 58a.

  The inner seal 58b and the outer seal 58a have an inlet connection channel 62a having a plurality of first elastic convex members 60a for communicating between the fuel gas channel 44 and the fuel gas inlet communication hole 34a, In order to communicate between the fuel gas flow path 44 and the fuel gas outlet communication hole 34b, an outlet connection flow path 62b having a plurality of first elastic convex members 60b is provided. The first elastic convex members 60 a and 60 b are formed of the same material as that of the second seal member 56 and are integrally formed.

  The inner seal 58b includes an inlet connection channel 66a having a plurality of first elastic convex members 64a for communicating between the oxidant gas channel 42 and the oxidant gas inlet communication hole 30a, and the oxidant gas. An outlet connection channel 66b having a plurality of first elastic convex members 64b is provided to communicate between the channel 42 and the oxidizing gas outlet communication hole 30b. The first elastic convex members 64a and 64b are formed of the same material as that of the second seal member 56 and are integrally formed.

  As shown in FIGS. 1 and 5, the surface 18b of the anode side metal separator 18 is provided with an outer seal 58c corresponding to the outer seal 58a and an inner seal 58d corresponding to the inner seal 58b. The outer seal 58c and the inner seal 58d have the same shape as the outer seal 58a and the inner seal 58b.

  The inner seal 58d and the outer seal 58c include an inlet connection channel 70a having a plurality of first elastic convex members 68a for communicating between the coolant channel 46 and the coolant inlet communication hole 32a, An outlet connection flow path 70b having a plurality of first elastic convex members 68b is provided to communicate between the cooling medium flow path 46 and the cooling medium outlet communication hole 32b. The first elastic convex members 68a and 68b are formed of the same material as that of the second seal member 56 and are integrally formed.

  As shown in FIGS. 5 to 7, the surface 18 b of the anode-side metal separator 18 extends in a direction intersecting the first elastic convex member 60 a at a position corresponding to the fuel gas inlet connection channel 62 a. Two third elastic convex members 72a and 72a that are parallel to the outer seal 58c that is the second elastic convex member and that are lower than the outer seal 58c, and an inner seal 58d that is the second elastic convex member. And a third elastic convex member 73a having a height lower than that of the inner seal 58d.

  The third elastic convex members 72a and 72a are long seal members that are juxtaposed on both sides of the outer seal 58c and extend in a direction intersecting the first elastic convex member 60a, and are separated from the outer seal 58c. Or integrally formed. The third elastic convex member 73a is a long seal member that is juxtaposed on one side of the inner seal 58d and extends in a direction intersecting the first elastic convex member 60a.

  The third elastic convex members 72a, 72a, and 73a are made of a resin member or a rubber member, and may be made of the same material as that of the second seal member 56, for example. In addition, each 3rd elastic convex member demonstrated below is comprised similarly to said 3rd elastic convex member 72a, 72a.

  The surface 18b of the anode-side metal separator 18 extends in a direction corresponding to the fuel gas outlet connection channel 62b in a direction intersecting the first elastic convex member 60b and is lower than the outer seal 58c. Two third elastic convex members 72b and 72b and one third elastic convex member 73b having a height lower than that of the inner seal 58d are provided.

  The surface 18b of the anode-side metal separator 18 extends in a direction intersecting the first elastic convex member 64a at a position corresponding to the oxidant gas inlet connection channel 66a and is higher than the outer seal 58c. Low third elastic convex members 74a, 74a are provided. The surface 18b of the anode-side metal separator 18 extends in a direction intersecting the first elastic convex member 64b at a position corresponding to the oxidant gas outlet connection channel 66b and is higher than the outer seal 58c. Low third elastic convex members 74b, 74b are provided.

  As shown in FIG. 4, the surface 18a of the anode side metal separator 18 has a second elasticity extending in a direction intersecting the first elastic convex member 68a at a position corresponding to the inlet connection flow path 70a of the cooling medium. Parallel to the outer seal 58a, which is a convex member, and lower than the outer seal 58a, the third elastic convex members 76a, 76a and the inner seal 58b, which is a second elastic convex member, and the inner side A third elastic convex member 78a having a height lower than that of the seal 58b is provided.

  The surface 18a of the anode side metal separator 18 extends in a direction corresponding to the outlet connecting flow path 70b of the cooling medium in a direction intersecting the first elastic convex member 68b and is lower than the outer seal 58a. Third elastic convex members 76b and 76b and a third elastic convex member 78b having a height lower than that of the inner seal 58b are provided.

  The operation of the fuel cell 10 configured as described above will be described below.

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 30a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 34a. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 32a.

  Therefore, the oxidant gas is introduced from the oxidant gas inlet communication hole 30a through the inlet connection channel 66a of the anode side metal separator 18 into the oxidant gas channel 42 of the cathode side metal separator 20 (FIG. 3 and FIG. 3). (See FIG. 4). This oxidant gas moves vertically downward while meandering in the direction of arrow B, and is supplied to the cathode side electrode 40 of the electrolyte membrane / electrode structure 16.

  On the other hand, the fuel gas is introduced into the fuel gas channel 44 from the fuel gas inlet communication hole 34a through the inlet connection channel 62a of the anode side metal separator 18 (see FIG. 4). The fuel gas moves vertically downward while meandering in the direction of arrow B along the fuel gas flow path 44, and is supplied to the anode side electrode 38 of the electrolyte membrane / electrode structure 16 (see FIG. 1).

  Accordingly, in each electrolyte membrane / electrode structure 16, the oxidant gas supplied to the cathode side electrode 40 and the fuel gas supplied to the anode side electrode 38 are consumed by an electrochemical reaction in the electrode catalyst layer. Power generation is performed.

  Next, the oxidant gas supplied to and consumed by the cathode side electrode 40 passes through the outlet connection channel 66b, and is then discharged in the direction of arrow A along the oxidant gas outlet communication hole 30b. Similarly, the fuel gas supplied to and consumed by the anode side electrode 38 passes through the outlet connection flow path 62b, and is then discharged in the direction of arrow A along the fuel gas outlet communication hole 34b.

  The cooling medium supplied to the cooling medium inlet communication hole 32a is introduced into the cooling medium flow path 46 between the anode side metal separator 18 and the cathode side metal separator 20 from the inlet connection flow path 70a, and then the arrow B Circulate in the direction. The cooling medium cools the electrolyte membrane / electrode structure 16 and then passes through the outlet connection flow path 70b and then is discharged from the cooling medium outlet communication hole 32b (see FIG. 1).

  In this case, in the first embodiment, as shown in FIGS. 4 and 5, the surface 18b of the anode-side metal separator 18 has, for example, a first elasticity at a position corresponding to the fuel gas inlet connection channel 62a. Third elastic convex members 72a and 72a parallel to the outer seal 58c extending in a direction crossing the convex member 60a and lower in height than the outer seal 58c, and parallel to the inner seal 58d and the inner seal A third elastic convex member 73a having a height lower than 58d is provided.

  For this reason, when a tightening load is applied to the fuel cell 10 in the stacking direction, the seal load acts on the outer seal 58c and the inner seal 58d, which are seal members. Accordingly, the outer seal 58c and the inner seal 58d are compressed, but the third elastic convex members 72a, 72a and 73a having a lower height than the outer seal 58c and the inner seal 58d have the seal load of the first elastic convex. It is possible to satisfactorily restrict the action on the shaped member 60a (see FIGS. 6 and 7).

  As a result, the generated seal load is suppressed, and the opening channel cross-sectional area of the inlet connection channel 62a can be stably secured. Accordingly, it is possible to obtain an effect that the structure can be simplified and desired sealing performance and fuel gas flow can be secured.

  In addition to the outlet connection channel 62b, the same effect can be obtained in the inlet connection channel 66a and the outlet connection channel 66b for the oxidizing gas, and the inlet connection channel 70a and the outlet connection channel 70b for the cooling medium. .

  In the first embodiment, the third elastic convex members 72a and 72a are provided in parallel on both sides of the outer seal 58c. However, the present invention is not limited to this. One third elastic convex member 72a may be provided only on one side.

  FIG. 8 is a partially enlarged explanatory view of an anode side metal separator (first metal separator) 80 constituting the fuel cell according to the second embodiment of the present invention. In addition, the same referential mark is attached | subjected to the component same as the anode side metal separator 18 which comprises the fuel cell 10 which concerns on 1st Embodiment, and the detailed description is abbreviate | omitted.

  The anode-side metal separator 80 has a plurality of third elastic convex members 82, 82 parallel to the outer seal 58c and lower in height than the outer seal 58c at a position corresponding to the fuel gas inlet connection flow path 62a. A plurality of third elastic convex members 84 are provided in parallel with the inner seal 58d and lower in height than the inner seal 58d.

  The third elastic convex members 82 and 82 are short seal members that are juxtaposed on both sides of the outer seal 58c and extend intermittently in a direction intersecting the first elastic convex member 60a. Separated or integrally formed.

  The third elastic convex member 84 is a short seal member that is juxtaposed on one side of the inner seal 58d and intermittently extends in a direction intersecting the first elastic convex member 60a. The third elastic convex members 82, 82 and 84 are made of a resin member or a rubber member, and are provided at positions corresponding to the first elastic convex member 60a in the stacking direction.

  Although not shown, the same applies to the outlet connection channel 62b, the oxidant gas inlet connection channel 66a and the outlet connection channel 66b, and the cooling medium inlet connection channel 70a and the outlet connection channel 70b. Composed.

  In the second embodiment configured as described above, the generated seal load is suppressed, the inlet connection flow path 62a can be stably secured, the configuration is simplified, and the desired sealing performance and The same effects as those of the first embodiment can be obtained, such as ensuring the flowability of the fuel gas.

It is a principal part disassembled perspective explanatory drawing of the electric power generation cell which comprises the fuel cell which concerns on the 1st Embodiment of this invention. FIG. 2 is a sectional view of the fuel cell taken along line II-II in FIG. 1. It is front explanatory drawing of the cathode side metal separator which comprises the said fuel cell. It is explanatory drawing of one surface of the anode side metal separator which comprises the said fuel cell. It is explanatory drawing of the other surface of the anode side metal separator which comprises the said fuel cell. FIG. 6 is a cross-sectional view of the anode side metal separator taken along line VI-VI in FIG. 5. It is the VII-VII sectional view taken on the line of the said anode side metal separator in FIG. It is a partially expanded explanatory view of the anode side metal separator which comprises the fuel cell which concerns on the 2nd Embodiment of this invention. It is the IX-IX sectional view taken on the line of the said anode side metal separator in FIG. It is front explanatory drawing of the metal separator which comprises the solid polymer electrolyte fuel cell currently disclosed by patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cell 12 ... Power generation cell 16 ... Electrolyte and electrode structure 18, 20, 80 ... Metal separator 30a ... Oxidant gas inlet communication hole 30b ... Oxidant gas outlet communication hole 32a ... Cooling medium inlet communication hole 32b ... Cooling medium Outlet communication hole 34a ... Fuel gas inlet communication hole 34b ... Fuel gas outlet communication hole 36 ... Solid polymer electrolyte membrane 38 ... Anode side electrode 40 ... Cathode side electrode 42 ... Oxidant gas channel 44 ... Fuel gas channel 46 ... Cooling Medium flow path 50, 56 ... Seal member 58a, 58c ... Outer seal 58b, 58d ... Inner seal 60a, 60b, 64a, 64b, 68a, 68b, 72a, 72b, 73a, 73b, 74a, 74b, 76a, 76b, 78a , 78b, 82, 84 ... elastic convex members 62a, 66a, 70a ... Inlet connection flow paths 62b, 66b, 70b ... Outlet connection flow

Claims (4)

An electrolyte / electrode structure having a pair of electrodes disposed on both sides of the electrolyte is sandwiched between the first and second metal separators, and at least any of fuel gas, oxidant gas, or cooling medium A fuel cell in which a fluid flow path for flowing the fluid in the surface direction of the electrolyte / electrode structure and a fluid communication hole for supplying the fluid in the stacking direction of the electrolyte / electrode structure are formed,
A connection channel having a plurality of first elastic convex members is provided on one surface of the first metal separator to communicate between the fluid channel and the fluid communication hole,
On the other surface of the first metal separator, a second elastic convex member disposed in a direction intersecting the first elastic convex member at a position corresponding to the connection flow path,
A third elastic convex member parallel to the second elastic convex member and having a lower height than the second elastic convex member;
A fuel cell comprising:   2. The fuel cell according to claim 1, wherein the third elastic convex member is arranged in parallel on both sides or one side of the second elastic convex member and continuously in a direction intersecting the first elastic convex member. A fuel cell, characterized in that it is an elongated seal member that extends.   2. The fuel cell according to claim 1, wherein the third elastic convex member is juxtaposed on both sides or one side of the second elastic convex member, and intermittently in a direction intersecting the first elastic convex member. A fuel cell comprising a plurality of short seal members arranged.   4. The fuel cell according to claim 1, wherein the second elastic convex member is a seal member that is integrally formed on the other surface of the first metal separator. 5. battery.

Images