JP2010055857A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly circulate gas through a joining passage communicating a reactant gas passage with a reactant gas communication hole, favorably enhance drainage property and conduct stable power generation, in a simple constitution. <P>SOLUTION: A power generation cell 12 includes an electrolyte membrane-electrode assembly 14 interposed between first and second metallic separators 16, 18. A first seal member 32 circling the outer peripheral end of the first metallic separator 16 is integrally formed. The first seal member 32 is integrally provided with a plurality of outlet projection parts 38b forming a plurality of outlet joining passages 36b communicating a fuel gas outlet communication hole 24b with a fuel gas passage 26. A flexible projection part 40b projecting to the fuel gas passage 26 side is integrally installed at the end of the outlet projection part 38b, and the projection part 40b is arranged continuously in the fuel gas passage 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes an electrolyte / electrode structure in which first and second electrodes are disposed on both sides of an electrolyte, the electrolyte / electrode structure is sandwiched between first and second separators, and the first First and second reaction gas flows for supplying a reaction gas along the electrode surfaces between the electrode and the first separator and between the second electrode and the second separator. While a path is formed, a first reaction gas communication hole penetrating in the stacking direction and communicating with the first reaction gas flow channel and a second reaction gas communication communicating with the second reaction gas flow channel The present invention relates to a fuel cell having holes.

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

  In this fuel cell, a fuel gas flow path (reactive gas flow path) for flowing a fuel gas (reactive gas) facing the anode side electrode and an oxidant facing the cathode side electrode in the plane of each separator An oxidant gas flow path (reactive gas flow path) for flowing gas (reactive gas) is provided. Furthermore, a fuel gas supply communication hole and a fuel gas discharge communication hole, which are reaction gas 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 supply communication hole and an oxidant gas discharge communication hole which are reaction gas communication holes communicating with the oxidant gas are formed.

  In this case, the reaction gas flow path and the reaction gas communication hole communicate with each other via a connection flow path (reaction gas flow path formed in the bridge portion) having parallel grooves or the like in order to flow the reaction gas smoothly and evenly. ing. For example, the fuel cell disclosed in Patent Document 1 includes a metal separator 1 as shown in FIG. 13, and the metal separator 1 circulates around the outer peripheral end of the metal plate and the seal member 2 is integrated. ing. The sealing member 2 is provided with an outer convex portion 2 a and an inner convex portion 2 b on the MEA side surface of the metal separator 1.

  The outer convex portion 2a circulates through the communication holes 3a to 3f for the fuel gas, the oxidant gas, and the cooling medium provided in the metal separator 1, while the inner convex portion 2b includes, for example, the fuel gas channel 4 It is going around.

  The fuel gas channel 4 communicates with the communication holes 3d and 3c through a plurality of through holes 5a and 5b, respectively. Bridge portions 6a and 6b are formed in the vicinity of the communication holes 3a and 3f on the oxidant gas side, and the bridge portions 6a and 6b include a plurality of convex seals 7a formed integrally with the seal member 2, 7b. The communication holes 3a and 3b communicate with an oxidant gas flow path (not shown) through convex seals 7a and 7b.

JP 2005-108506 A

  By the way, in said patent document 1, when integrally forming the rubber sealing member 2 on the metal plate, in order to prevent the rubber from leaking to an unnecessary portion, a mold pressing surface for pressing the metal plate with a mold. (Flat part) is required. Therefore, for example, a relatively wide gap S corresponding to the mold pressing surface is formed between the inner convex portion 2b and the convex seals 7a and 7b.

  Thereby, for example, when water partially accumulates between the convex seals 7b and the communication path is closed, the oxidant gas tends to flow around the closed communication path. For this reason, there exists a problem that drainage property will fall and the stable electric power generation becomes difficult.

  The present invention solves this type of problem, and with a simple configuration, the gas can be smoothly distributed in the connecting passage that connects the reaction gas flow path and the reaction gas communication hole, and the drainage performance is improved. An object of the present invention is to provide a fuel cell capable of performing stable power generation.

  The present invention includes an electrolyte / electrode structure in which first and second electrodes are disposed on both sides of an electrolyte, the electrolyte / electrode structure is sandwiched between first and second separators, and the first First and second reaction gas flows for supplying a reaction gas along the electrode surfaces between the electrode and the first separator and between the second electrode and the second separator. While a path is formed, a first reaction gas communication hole penetrating in the stacking direction and communicating with the first reaction gas flow channel and a second reaction gas communication communicating with the second reaction gas flow channel The present invention relates to a fuel cell provided with a hole.

  In this fuel cell, at least the first separator is integrally formed with a seal member, and the seal member forms a plurality of connection passages that communicate the first reaction gas flow path and the first reaction gas communication hole. A plurality of convex portions to be provided, and an end portion of the convex portion on the first reactive gas flow channel side is inclined in a direction away from the surface of the first separator, and the first reactive gas flow channel side The flexible protrusion part which protrudes in this is integrated.

  The first separator has a plurality of holes penetrating in proximity to the first reaction gas communication hole, and the plurality of protrusions are at the ends of the first reaction gas flow channel with the holes interposed therebetween. It is preferable to extend in parallel with the part.

  Furthermore, it is preferable that the convex portion is integrated with a seal line of a seal member formed close to the hole portion.

  In the present invention, the convex portion forming the connection passage is integrated with an end portion on the first reaction gas flow path side with a flexible protrusion that is inclined in a direction away from the surface of the first separator. For this reason, when the electrolyte / electrode structure is sandwiched between the first and second separators, the flexible protrusion is deformed to the surface side of the first separator and continues to the first reaction gas flow path. Arranged.

  Therefore, each connection passage formed between the convex portions can communicate with the first reaction gas flow path, and when any one of the connection passages is blocked by the generated water, the reaction gas is in communication with the connection passage and the connection passage. There is no detour through the gap with the first reaction gas channel. Thereby, smooth and reliable distribution of the reaction gas in the connecting passage is facilitated, and the drainage is improved satisfactorily and stable power generation can be performed.

  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. 1, in the power generation cell 12, an electrolyte membrane / electrode structure 14 is sandwiched between first and second metal separators 16 and 18. The first and second metal separators 16 and 18 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or the like.

  One end edge of the power generation cell 12 in the direction of arrow B (the horizontal direction in FIG. 1) communicates with each other in the direction of arrow A, which is the stacking direction, and oxidant for supplying an oxidant gas, for example, an oxygen-containing gas. Agent gas inlet communication hole (second reaction gas communication hole) 20a, cooling medium outlet communication hole 22b for discharging the cooling medium, and fuel gas outlet communication hole (for discharging hydrogen-containing gas, for example) First reaction gas communication holes) 24b are arranged in the direction of arrow C (vertical direction).

  A fuel gas inlet communication hole (first reaction gas communication hole) 24a for supplying fuel gas is connected to the other end edge of the power generation cell 12 in the arrow B direction. Cooling medium inlet communication holes 22a for supply and an oxidant gas outlet communication hole (second reaction gas communication hole) 20b for discharging the oxidant gas are arranged in the direction of arrow C.

  As shown in FIGS. 1 and 3, the surface 16 a of the first metal separator (first separator) 16 that faces the electrolyte membrane / electrode structure 14, for example, a meandering channel that folds back and forth by one reciprocal half in the direction of arrow B. A fuel gas flow path (first reaction gas flow path) 26 is provided. The fuel gas channel 26 includes a plurality of grooves 26a provided by forming the first metal separator 16 into a wave shape.

  As shown in FIG. 1, a cooling medium channel 28 communicating with the cooling medium inlet communication hole 22 a and the cooling medium outlet communication hole 22 b is formed on the surface 16 b opposite to the surface 16 a of the first metal separator 16. . The cooling medium flow path 28 includes a plurality of grooves 28 a extending in the direction of arrow B, for example, by overlapping the first metal separator 16 and the second metal separator 18.

  The first metal separator 16 is provided with a plurality of holes 30a and 30b penetrating at positions close to the fuel gas inlet communication hole 24a and the fuel gas outlet communication hole 24b, respectively.

  The first seal member 32 is integrated with the surfaces 16 a and 16 b of the first metal separator 16 by baking or injection molding around the outer peripheral end of the first metal separator 16. The first seal member 32 uses, for example, a seal material such as EPDM, NBR, fluorine rubber, silicon rubber, fluorosilicon rubber, butyl rubber, natural rubber, styrene rubber, chloroplane, or acrylic rubber, a cushion material, or a packing material. To do.

  The first seal member 32 is formed on the surface 16a of the first metal separator 16, and includes an oxidant gas inlet communication hole 20a, a cooling medium outlet communication hole 22b, a fuel gas outlet communication hole 24b, a fuel gas inlet communication hole 24a, and a cooling medium. It has the 1st protrusion 34 which goes around the inlet communication hole 22a and the oxidizing gas outlet communication hole 20b (refer FIG. 3).

  The first seal member 32 includes a plurality of inlet protrusions 38a that form a plurality of inlet connection passages 36a communicating the holes 30a and the fuel gas passages 26 on the surface 16a, the holes 30b, and the fuel gas. A plurality of outlet convex portions 38b forming a plurality of outlet connecting passages 36b communicating with the flow path 26 are integrally provided.

  Each inlet protrusion 38a is integrally formed of the same material as that of the first seal member 32, and extends in parallel with each groove 26a of the fuel gas flow channel 26 with each hole 30a interposed therebetween. Each of the inlet protrusions 38a is inclined at the end on the fuel gas flow path 26 side in a direction away from the surface 16a of the first metal separator 16, and protrudes toward the fuel gas flow path 26. Are integrated (see FIG. 5).

  The protruding portion 40a protrudes on the mold pressing surface 42 set on the surface 16a, and comes into contact with the surface 16a as shown in FIG. 2 when the power generation cell 12 (fuel cell 10) is assembled. In this way, the fuel gas passage 26 is continuously deformed.

  Similarly to the inlet convex portion 38a, the outlet convex portion 38b extends in parallel with the end portions of the groove portions 26a of the fuel gas flow channel 26 with the hole portions 30b interposed therebetween. The outlet protrusion 38b is integrated with an end on the fuel gas flow path 26 side, and a flexible protrusion 40b that is inclined in a direction away from the surface 16a and protrudes toward the fuel gas flow path 26 is integrated.

  The protruding portion 40b is disposed on the mold pressing surface 42 in the same manner as the protruding portion 40a described above, and is continuously disposed in the fuel gas passage 26 when the fuel cell 10 is assembled (see FIG. 2 and FIG. 2). (See FIG. 5).

  As shown in FIG. 4, the first seal member 32 has a second protrusion 44 formed on the surface 16 b of the first metal separator 16. The second protrusion 44 circulates around the oxidant gas inlet communication hole 20a, the fuel gas inlet communication hole 24a, the oxidant gas outlet communication hole 20b, and the fuel gas outlet communication hole 24b.

  The second protrusions 44 include a plurality of inlet protrusions 48a that form a plurality of inlet connection passages 46a that connect the fuel gas inlet communication holes 24a and the respective holes 30a, a fuel gas outlet communication hole 24b, and a plurality of holes 30b. And a plurality of outlet convex portions 48b forming a plurality of outlet connecting passages 46b communicating with each other. The second protrusion 44 further includes a plurality of inlet protrusions 52a that form a plurality of inlet connection passages 50a that connect the cooling medium inlet communication hole 22a and the cooling medium flow path 28, the cooling medium outlet communication hole 22b, and the cooling medium. A plurality of outlet convex portions 52b forming a plurality of outlet connecting passages 50b communicating with the flow path 28 are provided.

  As shown in FIGS. 1 and 6, the surface 18 a of the second metal separator (second separator) 18 facing the electrolyte membrane / electrode structure 14, for example, a meandering channel that folds back and forth in the direction of arrow B by one reciprocal half. An oxidant gas flow path (second reaction gas flow path) 54 is provided. The oxidant gas channel 54 includes a plurality of grooves 54a provided by forming the second metal separator 18 into a wave shape.

  The second seal member 56 is integrated with the surfaces 18 a and 18 b of the second metal separator 18 around the outer peripheral end of the second metal separator 18. The second seal member 56 is made of the same material as the first seal member 32 described above.

  As shown in FIG. 6, the second seal member 56 has a protrusion 58 provided on the surface 18 a of the second metal separator 18. The protrusion 58 circulates around the oxidant gas inlet communication hole 20a, the cooling medium outlet communication hole 22b, the fuel gas outlet communication hole 24b, the fuel gas inlet communication hole 24a, the cooling medium inlet communication hole 22a, and the oxidant gas outlet communication hole 20b. .

  Bridge portions 60 a and 60 b are provided between the oxidant gas inlet communication hole 20 a and the oxidant gas outlet communication hole 20 b and the oxidant gas flow path 54. The bridge portions 60 a and 60 b have a plurality of groove portions 62 a and 62 b, and lid members 64 a and 64 b are disposed corresponding to the protrusions 58 of the second seal member 56.

  As shown in FIGS. 1 and 2, the electrolyte membrane / electrode structure 14 includes, for example, a solid polymer electrolyte membrane 70 in which a perfluorosulfonic acid thin film is impregnated with water, and the solid polymer electrolyte membrane 70 sandwiched between them. An anode side electrode (first electrode) 72 and a cathode side electrode (second electrode) 74 are provided.

  The anode side electrode 72 and the cathode side electrode 74 are formed by uniformly applying a gas diffusion layer made of carbon paper or the like and porous carbon particles carrying a platinum alloy 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 70.

  FIG. 7 is a cross-sectional view of the main part of a molding die 80 for injection molding the first seal member 32 on the first metal separator 16.

  The molding die 80 includes a lower die 82 and an upper die 84, and a cavity 86 is formed between the lower die 82 and the upper die 84. The upper mold 84 has an undercut portion 88 for forming the protruding portions 40 a and 40 b of the first seal member 32.

  In the mold 80 configured as described above, after the metal plate 90 is disposed between the lower mold 82 and the upper mold 84, the cavity 86 is filled with a molten rubber material. Thereby, in the cavity 86, the rubber material is cured and the first seal member 32 is integrally formed with the metal plate 90 (see FIG. 8).

  Then, as shown in FIG. 9, the first metal separator 16 is released from the lower mold 82 and the upper mold 84. At this time, the upper die 84 is provided with an undercut portion 88, but the first seal member 32, which is a molded product, has flexibility. Therefore, the protrusions 40 a and 40 b which are undercut portions of the first seal member 32 are deformed and easily taken out from the upper mold 84. For this reason, the molding die 80 does not require a structure for moving the undercut portion 88, and the first seal member 32 can be injection-molded on the metal plate 90 with a simple and economical configuration.

  Next, as shown in FIG. 5, the first metal separator 16 and the second metal separator 18 are stacked with the electrolyte membrane / electrode structure 14 interposed therebetween. As a result, in the first seal member 32 integrally formed with the first metal separator 16, the protrusions 40 a and 40 b inclined upward from the surface 16 a of the first metal separator 16 are formed on the electrolyte membrane / electrode structure 14. It is pressed and deformed to the mold pressing surface 42 side. Therefore, when the power generation cells 12 are stacked and the fuel cell 10 is assembled, as shown in FIG. 2, the protrusions 40 a and 40 b cover the mold pressing surface 42 and part of the fuel gas passage 26. Forming.

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

  First, as shown in FIG. 1, a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 24a, and an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 20a. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 22a.

  Therefore, as shown in FIGS. 1 and 4, the fuel gas moves from the fuel gas inlet communication hole 24a to the surface 16a side of the first metal separator 16 through the plurality of inlet connection passages 46a and the plurality of holes 30a. To do. As shown in FIG. 3, the fuel gas that has moved to the surface 16 a side is introduced into the fuel gas flow channel 26 from the plurality of inlet connection passages 36 a. The fuel gas is supplied to the anode side electrode 72 constituting the electrolyte membrane / electrode structure 14 while reciprocating in the direction of arrow B.

  On the other hand, as shown in FIGS. 1 and 6, the oxidant gas is introduced from the oxidant gas inlet communication hole 20 a through the bridge portion 60 a of the second metal separator 18 into the oxidant gas flow path 54. The oxidant gas is supplied to the cathode side electrode 74 constituting the electrolyte membrane / electrode structure 14 while reciprocating in the direction of arrow B.

  Therefore, in the electrolyte membrane / electrode structure 14, the fuel gas supplied to the anode side electrode 72 and the oxidant gas supplied to the cathode side electrode 74 are consumed by an electrochemical reaction in the electrode catalyst layer, and power generation is performed. Is done.

  Next, as shown in FIG. 3, the fuel gas consumed by being supplied to the anode electrode 72 moves to the surface 16 b side through the plurality of outlet connection passages 36 b and the plurality of holes 30 b. As shown in FIG. 4, the fuel gas that has moved to the surface 16b side is discharged in the direction of arrow A along the fuel gas outlet communication hole 24b from the plurality of outlet connection passages 46b.

  Similarly, the oxidant gas supplied to the cathode side electrode 74 and consumed is discharged from the bridge portion 60b along the oxidant gas outlet communication hole 20b in the direction of arrow A (see FIGS. 1 and 6).

  The cooling medium supplied to the cooling medium inlet communication hole 22a is introduced into the cooling medium flow path 28 between the first and second metal separators 16 and 18, and then flows in the direction of arrow B. The cooling medium is discharged from the cooling medium outlet communication hole 22b after the electrolyte membrane / electrode structure 14 is cooled (see FIG. 1).

  In this case, in the first embodiment, as shown in FIGS. 3 and 4, the first seal member 32 is integrally formed with the first metal separator 16. The first seal member 32 includes a plurality of inlet protrusions 38a for forming a plurality of inlet connecting passages 36a that connect the plurality of holes 30a that communicate with the fuel gas inlet communication holes 24a and the fuel gas flow passage 26. A plurality of hole portions 30b communicating with the fuel gas outlet communication hole 24b and a plurality of outlet projections 38b for forming a plurality of outlet connection passages 36b communicating with the fuel gas flow path 26 are provided.

  Each inlet convex portion 38a is provided with a protruding portion 40a that is inclined in a direction away from the surface 16a and protrudes toward the fuel gas flow path 26, while each outlet convex portion 38b is in a direction away from the surface 16a. It has a protruding portion 40b that is inclined and protrudes toward the fuel gas flow path 26 side.

  Each protruding portion 40a, 40b protrudes above the mold pressing surface 42 by the molding die 80. When the power generation cell 12 is assembled, the protruding portions 40a, 40b are deformed to the mold pressing surface 42 side and become the fuel gas flow path 26. It is arranged continuously. Accordingly, each inlet connection passage 36a is formed continuously from the hole 30a to each groove 26a of the fuel gas flow channel 26, and each outlet connection passage 36b is continuous from the hole 30b to each groove 26a. Is formed.

  Thereby, for example, when the generated water stays in any of the outlet connection passages 36b, the fuel gas discharged from the fuel gas passage 26 is removed from the gap between the fuel gas passage 26 and the outlet connection passage 36b. There is no detour through. For this reason, spent fuel gas is introduced into the outlet connection passage 36b where the generated water stays, and drainage is performed, so that the outlet connection passage 36b can be prevented from being blocked by water.

  Therefore, smooth and reliable distribution of the spent fuel gas in each outlet connection passage 36b can be easily achieved. As a result, the drainage performance is improved satisfactorily, and stable power generation can be performed satisfactorily.

  Further, when water is introduced from the outside into the inlet connection passage 36a, detouring of the fuel gas is not caused and the water can be discharged well from the inlet connection passage 36a. Therefore, smooth and reliable distribution of the fuel gas in the inlet connection passage 36a is facilitated, and stable power generation can be performed.

  In addition, the protrusions 40a and 40b, which are flexible flaps, can be integrally provided on each of the inlet protrusions 38a and the outlet protrusions 38b, which is advantageous in that the configuration is simplified and economical. In the second metal separator 18, the bridge portions 60 a and 60 b can have the same configuration as the inlet convex portion 38 a and the outlet convex portion 38 b of the first metal separator 16.

  FIG. 10 is an explanatory cross-sectional view of a fuel cell 100 according to the second embodiment of the present invention. The fuel cell 100 is configured by stacking a plurality of power generation cells 102. The same components as those of the fuel cell 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the power generation cell 102, the electrolyte membrane / electrode structure 14 is sandwiched between the first and second metal separators 104 and 18. As shown in FIG. 11, the surface 16a of the first metal separator 104 has a plurality of inlet protrusions 105a extending in parallel to the grooves 26a of the fuel gas flow channel 26 with the holes 30a interposed therebetween, and the holes. A plurality of outlet convex portions 105b extending in parallel toward the groove portion 26a with the portion 30b interposed therebetween are integrally formed with the first seal member 32.

  A protrusion 40a is integrally provided at one end of each inlet protrusion 105a, and the other end on the hole 30a side is integrated with a seal line of the first protrusion 34 adjacent to the hole 30a. A protruding portion 40b is integrally provided at one end of the outlet convex portion 105b, and the other end on the hole 30b side is integrated with a seal line of the first protrusion 34 adjacent thereto.

  As shown in FIG. 12, the surface 16b of the first metal separator 104 has a plurality of inlet protrusions 106a extending to the fuel gas inlet communication hole 24a side with the hole 30a interposed therebetween, and a fuel with the hole 30b interposed therebetween. A plurality of outlet convex portions 106b extending to the gas outlet communication hole 24b side are integrally formed.

  The entrance protrusion 106a is integrated with the seal line of the second protrusion 44 close to the hole 30a, while the exit protrusion 106b is integrated with the seal line of the second protrusion 44 close to the hole 30b. The

  In the second embodiment configured as described above, each of the inlet protrusions 105a and each of the outlet protrusions 105b is integrated with a seal line adjacent to the holes 30a and 30b, and each of the inlet protrusions 106a. And each exit convex part 106b has each edge part integrated with a seal line. Therefore, the same effects as those of the first embodiment can be obtained, such as fuel gas leakage can be more reliably prevented and drainage can be improved.

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 cross-sectional explanatory view taken along line II-II in FIG. 1 of the fuel cell in which a plurality of power generation cells are stacked. It is explanatory drawing of one surface of the 1st metal separator which comprises the said electric power generation cell. It is explanatory drawing of the other surface of the 1st metal separator which comprises the said electric power generation cell. It is decomposition | disassembly explanatory drawing of the said power generation cell. It is explanatory drawing of one surface of the 2nd metal separator which comprises the said electric power generation cell. It is principal part sectional drawing of the shaping | molding die for carrying out the injection molding of the 1st seal member. It is operation | movement explanatory drawing of the said shaping | molding die. It is operation | movement explanatory drawing at the time of releasing from the said shaping | molding die. It is a cross-sectional explanatory view of a fuel cell according to a second embodiment of the present invention. It is explanatory drawing of one surface of the 1st metal separator which comprises the electric power generation cell of the said fuel cell. It is explanatory drawing of the other surface of the 1st metal separator which comprises the said electric power generation cell. It is front view explanatory drawing of the separator which comprises the fuel cell stack which concerns on patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100 ... Fuel cell 12, 102 ... Power generation cell 14 ... Electrolyte membrane electrode assembly 16, 18, 104 ... Metal separator 20a ... Oxidant gas inlet communication hole 20b ... Oxidant gas outlet communication hole 22a ... Cooling medium inlet communication Hole 22b ... Cooling medium outlet communication hole 24a ... Fuel gas inlet communication hole 24b ... Fuel gas outlet communication hole 26 ... Fuel gas flow path 28 ... Cooling medium flow path 30a, 30b ... Hole 32, 56 ... Seal members 34, 44, 58 ... Projections 36a, 50a ... Inlet connection channels 36b, 50b ... Outlet connection channels 38a, 48a, 52a, 105a, 106a ... Inlet projections 38b, 48b, 52b, 105b, 106b ... Outlet projections 40a, 40b ... Projection Part 42 ... Mold holding surface 54 ... Oxidant gas flow path 60a, 60b ... Bridge part 70 ... Solid polymer electrolyte membrane 72 ... Anode side electrode 74 ... Sword-side electrode 80 ... mold

Claims (3)

An electrolyte / electrode structure having first and second electrodes disposed on both sides of the electrolyte, the electrolyte / electrode structure being sandwiched between first and second separators, and the first electrode and the first electrode Between the first separator and between the second electrode and the second separator are formed first and second reaction gas flow paths for supplying a reaction gas along the respective electrode surfaces. On the other hand, a first reaction gas communication hole that penetrates in the stacking direction and communicates with the first reaction gas channel, and a second reaction gas communication hole that communicates with the second reaction gas channel are provided. A fuel cell,
At least the first separator is integrally formed with a seal member,
The seal member is provided with a plurality of convex portions that form a plurality of connection passages that connect the first reaction gas flow path and the first reaction gas communication hole,
At the end of the convex portion on the first reaction gas flow path side, there is a flexible protrusion that inclines in a direction away from the surface of the first separator and protrudes toward the first reaction gas flow path side. A fuel cell characterized by being integrated. 2. The fuel cell according to claim 1, wherein the first separator has a plurality of holes penetrating in proximity to the first reactive gas communication hole,
The plurality of convex portions extend in parallel with an end portion of the first reaction gas flow channel with each hole interposed therebetween.   3. The fuel cell according to claim 2, wherein the convex portion is integrated with a seal line of the seal member formed in the vicinity of the hole portion.

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