Power generation battery

Abstract

The present invention provides a power generation cell. In the power generation cell (10), a first bypass prevention convex portion (70) is integrally formed on a first separator body (54) in a manner protruding from the first separator body (54). A second bypass prevention convex portion (108) is integrally formed on a second separator body (90) in a manner protruding from the second separator body (90). A first bypass sealing component (83) is provided on a protruding end surface of the first bypass prevention convex portion (70) in a manner located outside a cathode electrode (28). A second bypass sealing component (122) is provided on a protruding end surface of the second bypass prevention convex portion (108) in a manner located outside an anode electrode (30). Thus, the reaction gas can be effectively prevented from flowing into the bypass flow path.

Description

Technical Field

[0001] The present invention relates to a power generation cell. Background Art

[0002] The power generation cell has a membrane electrode assembly (MEA), a resin frame and two separator components. The MEA has an electrolyte membrane and two electrodes arranged on both sides of the electrolyte membrane. The resin frame component protrudes outward from the outer periphery of the MEA in a state of being mounted on the MEA. Two separator components are arranged on both sides of the MEA. Each separator component includes a metal plate-shaped separator body. The separator body has a reaction gas flow path and a flow path sealing portion. The reaction gas flow path allows the reaction gas (oxidant gas or fuel gas) to flow from one end of the separator body to the other end along the power generation area of ​​each electrode. The flow path sealing portion surrounds the reaction gas flow path in a state of contact with the resin frame to prevent leakage of the reaction gas.

[0003] The bypass convex portion for preventing bypass of the reaction gas is located between the end of the reaction gas flow path in the flow path width direction and the flow path sealing portion in the separator body (bypass flow path) (for example, refer to Japanese Patent Publication No. 2019-79736). Summary of the invention

[0004] In such a power generation cell, it is necessary to effectively suppress the reaction gas from flowing into the bypass flow path.

[0005] The purpose of the present invention is to solve the above-mentioned technical problems.

[0006] One embodiment of the present invention is a power generation cell, which has a membrane electrode assembly, a resin frame and two separator components, wherein the membrane electrode assembly includes an electrolyte membrane and two electrodes arranged on both sides of the electrolyte membrane; the resin frame is arranged on the outer periphery of the membrane electrode assembly in a manner of protruding outward from the outer periphery; the two separator components are arranged on both sides of the membrane electrode assembly, and the two separator components respectively have a metal plate-shaped separator body, and the separator body has a reaction gas flow path and a flow path sealing part, wherein the reaction gas flow path allows the reaction gas to flow from one end of the separator body to the other end along the power generation area of ​​the electrode, and the flow path sealing part is in contact with the The resin frame portion surrounds the reaction gas flow path in a state of contact with the resin frame portion to prevent leakage of the reaction gas, the flow path sealing portion includes a sealing rib portion, which is integrally formed on the partition body in a manner of protruding from the partition body and elastically deformed by a compressive load in the thickness direction of the partition, and on the partition body, a bypass preventing convex portion is integrally formed in a manner of protruding toward the membrane electrode assembly, the bypass preventing convex portion is used to prevent the reaction gas from flowing into between the end portion of the reaction gas flow path in the flow path width direction and the flow path sealing portion, and a bypass sealing component is provided on the protruding end face of the bypass preventing convex portion in a manner of being located at a position closer to the outside than the electrode.

[0007] According to the present invention, a bypass sealing member is provided on the protruding end surface of the bypass blocking convex portion so as to be located outside the electrode. Therefore, the bypass blocking convex portion and the bypass sealing member can effectively prevent the reaction gas from flowing into the bypass flow path (between the end of the reaction gas flow path in the flow path width direction and the flow path sealing member).

[0008] The above-mentioned objects, features and advantages will be easily understood from the following description of the embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is an exploded perspective view of a power generation cell according to an embodiment of the present invention.

[0010] Figure 2 It's a power generation battery Figure 1 and Figure 4 II-II sectional view.

[0011] Figure 3 It is a plan view of the joined spacers viewed from the first spacer member toward the second spacer member.

[0012] Figure 4 It is an enlarged top view of the main part of the first partition member.

[0013] Figure 5It is a plan view of the joined spacers viewed from the second spacer member toward the first spacer member.

[0014] Figure 6 It is an enlarged top view of the main part of the second partition member.

[0015] Figure 7 This is a diagram showing a state in which the second separator member is stacked on the first separator member. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the power generation cell 10 involved in one embodiment of the present invention is a single cell of a fuel cell stack 12. The fuel cell stack 12 has a plurality of power generation cells 10. The plurality of power generation cells 10 are stacked in the direction of arrow A. A compressive load in the stacking direction of the plurality of power generation cells 10 is applied to the fuel cell stack 12. The fuel cell stack 12 is mounted on a fuel cell electric vehicle (not shown) as a vehicle-mounted fuel cell stack, for example.

[0017] The power generation cell 10 is in a horizontally long rectangular shape. The power generation cell 10 includes a membrane electrode assembly with a resin frame (hereinafter referred to as "MEA 14 with a resin frame"), a first separator member 16, and a second separator member 18. The MEA 14 with a resin frame is disposed between the first separator member 16 and the second separator member 18.

[0018] The first partition member 16 and the second partition member 18 are formed by press-forming the cross section of a metal thin plate into a corrugated shape. The metal thin plate is, for example, a steel plate, a stainless steel plate, an aluminum plate, or a plated steel plate. The metal thin plate may also be a stainless steel plate with a surface treatment for corrosion prevention or an aluminum plate with a surface treatment for corrosion prevention. The first partition member 16 and the second partition member 18 are joined to each other by a plurality of joining lines not shown to form a joined partition 20.

[0019] The resin-framed MEA 14 includes a membrane electrode assembly (hereinafter referred to as “MEA 22 ”) and a resin frame portion 24 (resin film). The resin frame portion 24 protrudes outward from the outer periphery of the MEA 22 .

[0020] like Figure 2 As shown, MEA22 has an electrolyte membrane 26, a cathode electrode 28 and an anode electrode 30. The cathode electrode 28 is arranged on one surface 26a of the electrolyte membrane 26. The anode electrode 30 is arranged on the other surface 26b of the electrolyte membrane 26. The electrolyte membrane 26 is, for example, a solid polymer electrolyte membrane (cation exchange membrane). The solid polymer electrolyte membrane is, for example, a film of perfluorosulfonic acid containing water. The electrolyte membrane 26 is sandwiched between the cathode electrode 28 and the anode electrode 30. The electrolyte membrane 26 is a fluorine-based electrolyte membrane or an HC (hydrocarbon)-based electrolyte.

[0021] The cathode electrode 28 includes a first electrode catalyst layer 32 and a first gas diffusion layer 34. The first electrode catalyst layer 32 is bonded to one surface 26a of the electrolyte membrane 26. The first gas diffusion layer 34 is stacked on the first electrode catalyst layer 32. The anode electrode 30 includes a second electrode catalyst layer 36 and a second gas diffusion layer 38. The second electrode catalyst layer 36 is bonded to the other surface 26b of the electrolyte membrane 26. The second gas diffusion layer 38 is stacked on the second electrode catalyst layer 36.

[0022] The first electrode catalyst layer 32 contains, for example, porous carbon particles carrying a platinum alloy on the surface. The porous carbon particles are uniformly coated on the surface of the first gas diffusion layer 34 together with an ion conductive polymer binder. The second electrode catalyst layer 36 contains, for example, porous carbon particles carrying a platinum alloy on the surface. The porous carbon particles are uniformly coated on the surface of the second gas diffusion layer 38 together with an ion conductive polymer binder. The first gas diffusion layer 34 and the second gas diffusion layer 38 include carbon paper or carbon cloth, etc.

[0023] The resin frame 24 is bonded to the outer periphery of the MEA 22 and extends to surround the outer periphery (see Figure 1 ). The resin frame 24 includes a first frame-shaped sheet 40 and a second frame-shaped sheet 42. The inner periphery of the first frame-shaped sheet 40 is joined to the outer periphery of the MEA 22. The second frame-shaped sheet 42 is joined to the first frame-shaped sheet 40. The first frame-shaped sheet 40 and the second frame-shaped sheet 42 are joined to each other in the thickness direction by an adhesive layer 44 composed of an adhesive. The second frame-shaped sheet 42 is joined to the outer periphery of the first frame-shaped sheet 40. The thickness of the first frame-shaped sheet 40 is thinner than the thickness of the second frame-shaped sheet 42. In addition, the resin frame 24 may be formed only by the first frame-shaped sheet 40 without joining the second frame-shaped sheet 42 to the first frame-shaped sheet 40.

[0024] The first frame-shaped sheet 40 and the second frame-shaped sheet 42 are made of a resin material. Examples of the materials of the first frame-shaped sheet 40 and the second frame-shaped sheet 42 include PPS (polyphenylene sulfide), PPA (polyphthalamide), PEN (polyethylene naphthalate), PES (polyether sulfone), LCP (liquid crystal polymer), PVDF (polyvinylidene fluoride), silicone resin, fluororesin, m-PPE (modified polyphenylene ether resin), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), or modified polyolefin.

[0025] The inner peripheral portion 25 of the resin frame 24 (the inner peripheral portion of the first frame-shaped sheet 40) is arranged between the outer peripheral portion 29 of the cathode electrode 28 and the outer peripheral portion 31 of the anode electrode 30. Specifically, the inner peripheral portion 25 of the resin frame 24 is sandwiched between the outer peripheral portion 27 of the electrolyte membrane 26 and the outer peripheral portion 31 of the anode electrode 30. The inner peripheral portion 25 of the resin frame 24 and the outer peripheral portion 27 of the electrolyte membrane 26 are bonded by the adhesive layer 44. In addition, the inner peripheral portion 25 of the resin frame 24 may also be sandwiched between the outer peripheral portion 27 of the electrolyte membrane 26 and the outer peripheral portion 29 of the cathode electrode 28.

[0026] The outer surface 29a of the outer peripheral portion 29 of the cathode electrode 28 is located on the same plane (on a common plane) as the one surface 46a of the power generation region 46 of the MEA 22 (the outer surface facing the first separator member 16). The outer surface 31a of the outer peripheral portion 31 of the anode electrode 30 is located at a position closer to the opposite side of the cathode electrode 28 (the direction of the arrow A2) than the other surface 46b of the power generation region 46 (the outer surface facing the second separator member 18). The outer surface 31a of the outer peripheral portion 31 of the anode electrode 30 is located at a position closer to the opposite side of the cathode electrode 28 (the direction of the arrow A2) than the outer surface 40a of the first frame-shaped sheet 40 (the surface on the opposite side of the second frame-shaped sheet 42).

[0027] In addition, the resin frame 24 may be a portion that makes the electrolyte membrane 26 protrude outward from the cathode electrode 28 and the anode electrode 30. In addition, the resin frame 24 may have a protruding portion that makes the electrolyte membrane 26 protrude outward from the cathode electrode 28 and the anode electrode 30, and a frame-shaped film attached to both surfaces of the protruding portion.

[0028] like Figure 1 As shown, one end edge portion in the long side direction of each power generation cell 10 has an oxidant gas supply through hole 48a, a cooling medium supply through hole 50a, and a fuel gas discharge through hole 52b. One end edge portion in the long side direction of each power generation cell 10 is an end edge portion in the direction of arrow B1 of each power generation cell 10. The oxidant gas supply through hole 48a, the cooling medium supply through hole 50a, and the fuel gas discharge through hole 52b are arranged in a row along the short side direction of the power generation cell 10. The short side direction of each power generation cell 10 is along the arrow C direction.

[0029] The oxidant gas (e.g., oxygen-containing gas) as one reaction gas flows through the oxidant gas supply through hole 48a in the direction of arrow A2. The cooling medium (e.g., pure water, ethylene glycol, oil, etc.) flows through the cooling medium supply through hole 50a in the direction of arrow A2. The fuel gas (e.g., hydrogen-containing gas) as another reaction gas flows through the fuel gas discharge through hole 52b in the direction of arrow A1.

[0030] The other end edge of the long side direction of each power generation cell 10 has a fuel gas supply through hole 52a, a cooling medium discharge through hole 50b, and an oxidant gas discharge through hole 48b. The other end edge of the long side direction of each power generation cell 10 is the end edge of the arrow B2 direction of each power generation cell 10. The fuel gas supply through hole 52a, the cooling medium discharge through hole 50b, and the oxidant gas discharge through hole 48b are arranged in the arrow C direction.

[0031] The fuel gas flows through the fuel gas supply passage 52a in the direction of arrow A2. The coolant flows through the coolant discharge passage 50b in the direction of arrow A1. The oxidant gas flows through the oxidant gas discharge passage 48b in the direction of arrow A1.

[0032] The arrangement, shape, and size of the above-mentioned communication holes (oxidant gas supply communication holes 48 a and the like) are not limited to the present embodiment, and can be appropriately set according to required specifications.

[0033] like Figure 2 and Figure 3 As shown, the first separator member 16 has a first separator body 54 in the shape of a metal plate. The first separator body 54 is formed in a rectangular shape. The surface of the first separator body 54 facing the MEA 14 with a resin frame (hereinafter referred to as "surface 54a") has an oxidant gas flow path 56 (reaction gas flow path) extending along the long side direction (arrow B direction) of the power generation cell 10. The oxidant gas flow path 56 is connected to the oxidant gas supply connecting hole 48a and the oxidant gas discharge connecting hole 48b in a fluid-flowable manner. The oxidant gas flow path 56 supplies the oxidant gas to the cathode electrode 28.

[0034] The oxidant gas flow path 56 has a plurality of first flow path grooves 60. Each of the first flow path grooves 60 is located between a plurality of first flow path protrusions 58 extending in the direction of arrow B. That is, in the oxidant gas flow path 56, the first flow path protrusions 58 and the first flow path grooves 60 are alternately arranged along the flow path width direction (arrow C direction). The plurality of first flow path protrusions 58 and the plurality of first flow path grooves 60 are integrally formed with the first partition body 54 by press molding. The first flow path protrusions 58 and the first flow path grooves 60 extend in a wavy shape in the direction of arrow B. However, the first flow path protrusions 58 and the first flow path grooves 60 may also extend in a straight line in the direction of arrow B.

[0035] exist Figure 2In the embodiment, the cross-sectional shape of the first flow path protrusion 58 is a trapezoid. That is, the cross-sectional shape of the first flow path protrusion 58 is tapered as it approaches the protruding direction of the first flow path protrusion 58. In addition, the cross-sectional shape of the first flow path protrusion 58 may be a rectangle. Hereinafter, the first flow path protrusions 58 located at both ends of the flow path width direction among the plurality of first flow path protrusions 58 are referred to as "first end flow path protrusions 58a". The first end flow path protrusions 58a are located at a position closer to the inner side than the outer peripheral end surface 28e of the cathode electrode 28.

[0036] exist Figure 3 In the embodiment, a first sealing portion 61 is provided on the surface 54a of the first separator body 54. The first sealing portion 61 is used to prevent the reaction gas (oxidant gas or fuel gas) or the fluid as the cooling medium from leaking out. The first sealing portion 61 is pressed against the outer surface 42a of the second frame-shaped sheet 42 (the outer surface of the second frame-shaped sheet 42 on the side opposite to the first frame-shaped sheet 40) (see Figure 2 ). The first sealing portion 61 extends in a wave shape when viewed from the separator thickness direction (arrow A direction). However, the first sealing portion 61 may extend in a straight line when viewed from the separator thickness direction.

[0037] The first sealing portion 61 includes a plurality of first communication hole sealing portions 62 and a first flow path sealing portion 64. The plurality of first communication hole sealing portions 62 surround a plurality of communication holes (such as the oxidizing gas supply communication hole 48a). The first flow path sealing portion 64 is located at the outer periphery of the first separator body 54.

[0038] like Figure 2 As shown, the first sealing portion 61 includes a first sealing rib portion 66 and a first resin sealing component 68. The first sealing rib portion 66 is integrally formed with the first separator body 54 in a manner protruding toward the MEA 14 with a resin frame. The first resin sealing component 68 is mounted on the protruding end surface of the first sealing rib portion 66. The first sealing rib portion 66 is elastically deformed by a compressive load in the direction of arrow A.

[0039] The cross-sectional shape of the first sealing rib portion 66 is a trapezoid. That is, the cross-sectional shape of the first sealing rib portion 66 becomes thinner as it approaches the protruding direction of the first sealing rib portion 66. In addition, the cross-sectional shape of the first sealing rib portion 66 may also be a rectangle. The first resin sealing component 68 is a rubber seal fixed to the protruding end face of the first sealing rib portion 66 by printing or coating. As the resin material constituting the first resin sealing component 68, for example, polyester fiber, silicone rubber, EPDM (ethylene propylene diene monomer rubber), FKM (fluororubber), etc. can be cited. The first resin sealing component 68 can also be fixed on the outer surface 42a of the second frame-shaped sheet 42.

[0040] exist Figure 2 and Figure 4 , the first separator body 54 has a plurality of first bypass-blocking convex portions 70. The plurality of first bypass-blocking convex portions 70 are located between the end portion (first end flow path protrusion 58a) of the oxidant gas flow path 56 in the flow path width direction and the first flow path sealing portion 64. The plurality of first bypass-blocking convex portions 70 prevent the oxidant gas from bypassing the oxidant gas flow path 56 and flowing from the oxidant gas supply passage 48a to the oxidant gas discharge passage 48b. That is, the plurality of first bypass-blocking convex portions 70 prevent the oxidant gas from flowing into the first bypass flow path 72. In other words, the first bypass-blocking convex portions 70 prevent the oxidant gas from bypassing the oxidant gas flow path 56. The first bypass flow path 72 is located between the first end flow path protrusion 58a and the first flow path sealing portion 64.

[0041] In the present embodiment, the flow path width direction of the oxidant gas flow path 56 is the direction along the short side of the first separator body 54 (arrow C direction). The plurality of first bypass preventing convex portions 70 are integrally formed with the first separator body 54 by press molding. The plurality of first bypass preventing convex portions 70 protrude from the first separator body 54 toward the MEA 14 with a resin frame. The plurality of first bypass preventing convex portions 70 are arranged at intervals along the extending direction of the first end flow path protrusion 58a (arrow B direction).

[0042] The cross-sectional shape of each first bypass-blocking convex portion 70 is a trapezoid (see Figure 4 ). That is, the cross-sectional shape of each first bypass preventing convex portion 70 becomes thinner as it approaches the protruding direction of the first bypass preventing convex portion 70. However, the cross-sectional shape of each first bypass preventing convex portion 70 may also be a rectangle.

[0043] The first end flow path protrusion 58a has a plurality of first concave curved portions 74 and a plurality of first convex curved portions 76. Each of the first concave curved portions 74 is curved in a manner concave in a direction away from the first flow path sealing portion 64. Each of the first convex curved portions 76 is curved in a manner protruding toward the first flow path sealing portion 64. The plurality of first bypass-blocking convex portions 70 include a plurality of first bypass-blocking convex portions 70a and a plurality of first bypass-blocking convex portions 70b. The plurality of first bypass-blocking convex portions 70a are located between the plurality of first concave curved portions 74 of the first end flow path protrusion 58a and the first flow path sealing portion 64. The plurality of first bypass-blocking convex portions 70b are located between the first convex curved portions 76 of the first end flow path protrusion 58a and the first flow path sealing portion 64. The plurality of first bypass blocking convex portions 70a and the plurality of first bypass blocking convex portions 70b are alternately arranged at intervals from each other along the extending direction of the first end portion flow path protrusion 58a.

[0044] One end of the plurality of first bypass preventing convex portions 70a is connected to the inner side portion 66a of the first sealing rib portion 66. The other ends of the plurality of first bypass preventing convex portions 70a are respectively connected to the plurality of first concave curved portions 74 of the first end flow path protrusion 58a. One end of the plurality of first bypass preventing convex portions 70b is connected to the inner side portion 66a of the first sealing rib portion 66. The other ends of the plurality of first bypass preventing convex portions 70b are respectively connected to the plurality of first convex curved portions 76 of the first end flow path protrusion 58a.

[0045] The height H1 (the protruding length from the first separator body 54) of each first bypass blocking convex portion 70 is lower than the height H2 of the first flow path sealing portion 64 (see Figure 2 The protruding end surface of each first bypass-preventing convex portion 70 includes a first inner end surface 78 and a first outer end surface 80. Each first inner end surface 78 faces the outer surface 29a of the outer peripheral portion 29 of the cathode electrode 28. Each first outer end surface 80 is located at a position further outward than the cathode electrode 28 in a state of being away from the outer surface 42a of the second frame-shaped sheet 42.

[0046] The portion of each first outer end surface 80 adjacent to the inner side portion 66a of the first sealing rib portion 66 has a first recess 82. Each first recess 82 is recessed in the opposite direction of the resin frame portion 24. That is, the back side (refrigerant surface) of each first recess 82 protrudes in the opposite direction of the resin frame portion 24. Accordingly, the rigidity of the inner side portion 66a of the first flow path sealing portion 64 can be reduced compared to the case where each first bypass-blocking convex portion 70 does not have the first recess 82. Therefore, the first sealing rib portion 66 can be effectively elastically deformed by a compressive load, and therefore, a moderate sealing surface pressure can be applied to the sealing surface (first resin sealing component 68) of the first flow path sealing portion 64.

[0047] A first bypass sealing member 83 is mounted on the first outer end face 80 of each first bypass preventing convex portion 70. Each first bypass sealing member 83 is a rubber seal fixed to the first outer end face 80 by printing or coating. As the resin material constituting each first bypass sealing member 83, the same material as the constituent material of the first resin sealing member 68 and the second resin sealing member 106 described above can be cited. That is, each first bypass sealing member 83 is composed of a rubber material. In addition, the constituent material of each first bypass sealing member 83 is the same as the constituent material of the first resin sealing member 68. In this case, for example, when the resin material is coated on the protruding end face of the first sealing rib portion 66, the resin material can also be coated on the first outer end face 80. Therefore, the first bypass sealing member 83 can be effectively mounted on the first outer end face 80 of each first bypass preventing convex portion 70.

[0048] exist Figure 2In the embodiment, each first bypass sealing member 83 is installed on the entire first outer end surface 80. That is, each first bypass sealing member 83 is also installed on the bottom surface of each first recessed portion 82. The outer surface 83a of each first bypass sealing member 83 facing the resin frame portion 24 is close to the outer surface 42a of the second frame-shaped sheet 42. There is a slight gap between the outer surface 83a and the outer surface 42a. According to this, the compressive load acting on the plurality of first bypass sealing members 83 can be suppressed, and therefore, a moderate sealing surface pressure can be applied to the sealing surface of the first flow path sealing portion 64.

[0049] However, the outer surface 83a of each first bypass sealing member 83 may be in contact with the outer surface 42a of the second frame-shaped sheet 42. In this case, each first bypass sealing member 83 is made of a rubber material (which is more easily elastically deformed than the first sealing rib portion 66), and therefore, a significant drop in the sealing surface pressure of the first flow path sealing portion 64 can be suppressed.

[0050] The outer surface 83b of each first bypass seal member 83 facing the MEA 22 is in contact with or close to the outer peripheral end surface 28e of the cathode electrode 28. The outer surface 83c of each first bypass seal member 83 on the opposite side of the MEA 22 is away from the inner side portion 66a of the first seal rib portion 66. Accordingly, when a compressive load is applied to the plurality of power generation cells 10, the elastic deformation of the inner side portion 66a of the first seal rib portion 66 is not hindered by the plurality of first bypass seal members 83.

[0051] The plurality of first bypass sealing members 83 may not be mounted on all first bypass blocking convex portions 70. The plurality of first bypass sealing members 83 may be mounted on at least the first bypass blocking convex portion 70 closest to the inlet of the oxidant gas flow path 56 among the plurality of first bypass blocking convex portions 70.

[0052] exist Figure 4 In the embodiment, a plurality of first intermediate convex portions 84 supporting the outer peripheral portion of the MEA 22 are located between the first bypass blocking convex portions 70 adjacent to each other. Each first intermediate convex portion 84 protrudes from the first separator body 54 toward the MEA 14 with a resin frame. Each first intermediate convex portion 84 extends in a direction intersecting with the extending direction of the first end flow path protrusion 58a. Each first intermediate convex portion 84 is arranged at a position overlapping with the outer peripheral end surface 28e of the cathode electrode 28 when viewed from the stacking direction.

[0053] like Figure 1 , Figure 2 and Figure 5As shown, the second separator member 18 has a second separator body 90 in the shape of a metal plate. The second separator body 90 is formed in a rectangular shape. The surface of the second separator body 90 facing the MEA 14 with a resin frame (hereinafter referred to as "surface 90a") has a fuel gas flow path 92 (reaction gas flow path) extending along the long side direction (arrow B direction) of the power generation cell 10. The fuel gas flow path 92 is connected to the fuel gas supply connecting hole 52a and the fuel gas discharge connecting hole 52b in a fluid-flowable manner. The fuel gas flow path 92 supplies fuel gas to the anode electrode 30.

[0054] The fuel gas flow path 92 has a plurality of second flow path grooves 96. Each second flow path groove 96 is located between a plurality of second flow path protrusions 94 extending in the direction of arrow B. That is, in the fuel gas flow path 92, the second flow path protrusions 94 and the second flow path grooves 96 are alternately arranged along the flow path width direction (arrow C direction). The plurality of second flow path protrusions 94 and the plurality of second flow path grooves 96 are integrally formed on the second partition body 90 by press molding. The second flow path protrusions 94 and the second flow path grooves 96 extend in a wavy manner in the direction of arrow B. However, the second flow path protrusions 94 and the second flow path grooves 96 may also extend in a straight line in the direction of arrow B.

[0055] exist Figure 2 In the embodiment, the cross-sectional shape of the second flow path protrusion 94 is a trapezoid. That is, the cross-sectional shape of the second flow path protrusion 94 becomes thinner as it approaches the protruding direction of the second flow path protrusion 94. In addition, the cross-sectional shape of the second flow path protrusion 94 may also be a rectangle. Hereinafter, the second flow path protrusions 94 located at both ends of the flow path width direction among the plurality of second flow path protrusions 94 are referred to as "second end flow path protrusions 94a". The second end flow path protrusions 94a are located at a position closer to the inside than the outer peripheral end surface 30e of the anode electrode 30.

[0056] exist Figure 5 In the embodiment, a second sealing portion 98 is provided on the surface 90a of the second separator body 90. The second sealing portion 98 is used to prevent the reaction gas (oxidant gas or fuel gas) or the fluid as the cooling medium from leaking out. The second sealing portion 98 is pressed against the outer surface 40a of the first frame-shaped sheet 40 (the outer surface of the first frame-shaped sheet 40 on the side opposite to the second frame-shaped sheet 42) (refer to Figure 2 ). The second sealing portion 98 extends in a wave shape when viewed from the thickness direction of the partition (the direction of arrow A). However, the second sealing portion 98 may extend in a straight line when viewed from the thickness direction of the partition.

[0057] The second sealing portion 98 includes a plurality of second communication hole sealing portions 100 and a second flow path sealing portion 102. The plurality of second communication hole sealing portions 100 individually surround a plurality of communication holes (such as the oxidant gas supply communication hole 48a). The second flow path sealing portion 102 is located at the outer periphery of the second separator body 90. The second sealing portion 98 is arranged to overlap with the first sealing portion 61 when viewed from the separator thickness direction (see Figure 2 ).

[0058] like Figure 2 As shown, the second sealing portion 98 includes a second sealing rib portion 104 and a second resin sealing component 106. The second sealing rib portion 104 is integrally formed on the second separator body 90 in a manner protruding toward the MEA 14 with a resin frame. The second resin sealing component 106 is mounted on the protruding end surface of the second sealing rib portion 104. The second sealing rib portion 104 is elastically deformed by a compressive load in the direction of arrow A.

[0059] The cross-sectional shape of the second sealing rib portion 104 is a trapezoid. That is, the cross-sectional shape of the second sealing rib portion 104 becomes thinner as it approaches the protruding direction of the second sealing rib portion 104. In addition, the cross-sectional shape of the second sealing rib portion 104 may also be a rectangle. The second resin sealing component 106 is a rubber seal that is fixed to the protruding end face of the second sealing rib portion 104 by printing or coating. As the resin material constituting the second resin sealing component 106, the same material as the constituent material of the above-mentioned first resin sealing component 68 can be cited. The second resin sealing component 106 can also be fixed to the outer surface 40a of the first frame-shaped sheet 40.

[0060] exist Figure 2 and Figure 6 In the embodiment, the second separator body 90 has a plurality of second bypass-blocking convex portions 108. The plurality of second bypass-blocking convex portions 108 are located between the end portion (second end flow path protrusion 94a) of the fuel gas flow path 92 in the flow path width direction and the second flow path sealing portion 102. The plurality of second bypass-blocking convex portions 108 prevent the fuel gas from bypassing the fuel gas flow path 92 and flowing from the fuel gas supply connecting hole 52a to the fuel gas discharge connecting hole 52b. That is, the plurality of second bypass-blocking convex portions 108 prevent the fuel gas from flowing into the second bypass flow path 110. In other words, the second bypass-blocking convex portions 108 prevent the fuel gas from bypassing the fuel gas flow path 92. The second bypass flow path 110 is located between the second end flow path protrusion 94a and the second flow path sealing portion 102.

[0061] In the present embodiment, the flow path width direction of the fuel gas flow path 92 is the direction along the short side of the second separator body 90 (arrow C direction). The plurality of second bypass prevention convex portions 108 are integrally formed on the second separator body 90 by press molding. The plurality of second bypass prevention convex portions 108 protrude from the first separator body 54 toward the MEA 14 with a resin frame. The plurality of second bypass prevention convex portions 108 are arranged at intervals along the extension direction of the second end flow path protrusion 94a (arrow B direction).

[0062] The cross-sectional shape of each second bypass-blocking convex portion 108 is a trapezoidal shape (see Figure 6 ). That is, the cross-sectional shape of each second bypass preventing convex portion 108 becomes thinner as it approaches the protruding direction of the second bypass preventing convex portion 108. However, the cross-sectional shape of each second bypass preventing convex portion 108 may also be a rectangle.

[0063] The second end flow path protrusion 94a has a plurality of second concave curved portions 112 and a plurality of second convex curved portions 114. Each second concave curved portion 112 is curved in a manner of being concave in a direction away from the second flow path sealing portion 102. Each second convex curved portion 114 is curved in a manner of protruding toward the second flow path sealing portion 102. The plurality of second bypass blocking convex portions 108 include a plurality of second bypass blocking convex portions 108a and a plurality of second bypass blocking convex portions 108b. The plurality of second bypass blocking convex portions 108a are located between the plurality of second concave curved portions 112 of the second end flow path protrusion 94a and the second flow path sealing portion 102. The plurality of second bypass blocking convex portions 108b are located between the plurality of second convex curved portions 114 of the second end flow path protrusion 94a and the second flow path sealing portion 102. The plurality of second bypass blocking convex portions 108 a and the plurality of second bypass blocking convex portions 108 b are alternately arranged at intervals from each other along the extending direction of the second end portion flow path protrusion 94 a .

[0064] One end of the plurality of second bypass preventing convex portions 108a is connected to the inner side portion 104a of the second sealing rib portion 104. The other end of the plurality of second bypass preventing convex portions 108a is away from the plurality of second concave curved portions 11 of the second end flow path protrusion 94a. One end of the plurality of second bypass preventing convex portions 108b is connected to the inner side portion 104a of the second sealing rib portion 104. The other end of the plurality of second bypass preventing convex portions 108b is respectively connected to the plurality of second convex curved portions 114 of the second end flow path protrusion 94a.

[0065] The height H3 (the protruding length from the second separator body 90) of each second bypass preventing convex portion 108 is lower than the height H4 (see Figure 2The protruding end surface of each second bypass-preventing convex portion 108 includes a second inner end surface 116 and a second outer end surface 118. Each second inner end surface 116 faces the outer surface 31a of the outer peripheral portion 31 of the anode electrode 30. Each second outer end surface 118 is located at a position further outward than the anode electrode 30 in a state of being away from the outer surface 40a of the first frame-shaped sheet 40.

[0066] The portion of each second outer end surface 118 adjacent to the inner side portion 104a of the second sealing rib portion 104 has a second recess 120. Each second recess 120 is recessed in the direction opposite to the resin frame portion 24. That is, the back side (refrigerant surface) of each second recess 120 protrudes in the opposite direction of the resin frame portion 24. Accordingly, the rigidity of the side wall of the second flow path sealing portion 102 can be reduced compared to the case where each second bypass-preventing convex portion 108 does not have the second recess 120. Therefore, the inner side portion 104a of the second sealing rib portion 104 can be effectively elastically deformed by a compressive load, and therefore, a moderate sealing surface pressure can be applied to the sealing surface (second resin sealing component 106) of the second flow path sealing portion 102.

[0067] A second bypass sealing member 122 is mounted on the second outer end face 118 of each second bypass preventing convex portion 108. Each second bypass sealing member 122 is a rubber seal fixed to the second outer end face 118 by printing or coating. As the resin material constituting each second bypass sealing member 122, the same material as the constituent material of the first resin sealing member 68 and the second resin sealing member 106 described above can be cited. That is, each second bypass sealing member 122 is made of a rubber material. In addition, the constituent material of each second bypass sealing member 122 is the same as the constituent material of the second resin sealing member 106. In this case, for example, when the resin material is coated on the protruding end face of the second sealing rib portion 104, the resin material can also be coated on the second outer end face 118. Therefore, the second bypass sealing member 122 can be effectively mounted on the second outer end face 118 of each second bypass preventing convex portion 108.

[0068] exist Figure 2 In the embodiment, each second bypass sealing member 122 is installed on the entirety of each second outer end surface 118. That is, each second bypass sealing member 122 is also installed on the bottom surface of each second recess 120. The outer surface 122a of each second bypass sealing member 122 facing the resin frame portion 24 is close to the outer surface 40a of the first frame-shaped sheet 40. A slight gap is left between the outer surface 122a and the outer surface 40a. Accordingly, it is possible to suppress the compressive load from acting on the plurality of second bypass sealing members 122, and thus, it is possible to apply a moderate sealing surface pressure to the sealing surface of the second flow path sealing portion 102.

[0069] However, the outer surface 122a of each second bypass sealing member 122 may be in contact with the outer surface 40a of the first frame-shaped sheet 40. In this case, each second bypass sealing member 122 is made of a rubber material (which is more easily elastically deformed than the second sealing rib portion 104), and therefore, a significant drop in the sealing surface pressure of the second flow path sealing portion 102 can be suppressed.

[0070] The outer surface 122b of each second bypass seal member 122 facing the MEA 22 contacts or approaches the outer peripheral end surface 30e of the anode electrode 30. The outer surface 122c of each second bypass seal member 122 on the opposite side of the MEA 22 is away from the inner side portion 104a of the second seal rib portion 104. Accordingly, when a compressive load is applied to the plurality of power generation cells 10, the elastic deformation of the inner side portion 104a of the second seal rib portion 104 is not hindered by the plurality of second bypass seal members 122.

[0071] The plurality of second bypass sealing members 122 may not be mounted on all the second bypass blocking convex portions 108. The plurality of second bypass sealing members 122 may be mounted on at least the second bypass blocking convex portion 108 closest to the inlet of the fuel gas flow path 92 among the plurality of second bypass blocking convex portions 108.

[0072] exist Figure 6 In the embodiment, a plurality of second intermediate convex portions 124 supporting the outer peripheral portion of the MEA 22 are located between the adjacent second bypass blocking convex portions 108. Each second intermediate convex portion 124 protrudes from the second separator body 90 toward the MEA 14 with a resin frame. Each second intermediate convex portion 124 is arranged at a position overlapping the outer peripheral portion 31 and the outer peripheral end surface 30e of the anode electrode 30 when viewed from the stacking direction.

[0073] like Figure 7 As shown, when viewed from the stacking direction, the first flow path protrusion 58 of the oxidant gas flow path 56 and the second flow path protrusion 94 of the fuel gas flow path 92 have waveforms of the same wavelength and opposite phases to each other. The plurality of second bypass blocking convex portions 108 overlap with the plurality of first bypass blocking convex portions 70 when viewed from the stacking direction.

[0074] like Figure 1 As shown, the cooling medium flow path 126 is located between the surface 54b of the first partition body 54 and the surface 90b of the second partition body 90 which are joined to each other. The cooling medium flow path 126 is connected to the cooling medium supply connecting hole 50a and the cooling medium discharge connecting hole 50b in a fluid-flowable manner. The cooling medium flow path 126 is formed by overlapping the back shape of the first partition body 54 and the back shape of the second partition body 90.

[0075] The power generation cell 10 configured in this manner operates as follows.

[0076] First, if Figure 1 As shown, the oxidant gas is supplied to the oxidant gas supply passage 48a, the fuel gas is supplied to the fuel gas supply passage 52a, and the cooling medium is supplied to the cooling medium supply passage 50a.

[0077] The oxidant gas is introduced from the oxidant gas supply passage 48a into the oxidant gas flow path 56 of the first separator member 16. Figure 3 As shown, the oxidant gas moves along the oxidant gas flow path 56 in the direction of arrow B and is supplied to the cathode electrode 28 of the MEA 22 .

[0078] On the other hand, Figure 1 As shown in FIG. 1 , the fuel gas is introduced from the fuel gas supply passage 52a into the fuel gas flow path 92 of the second separator member 18. Figure 5 As shown, the fuel gas moves in the direction of arrow B along the fuel gas flow path 92 and is supplied to the anode electrode 30 of the MEA 22 .

[0079] Therefore, in each MEA 22 , the oxidant gas supplied to the cathode electrode 28 and the fuel gas supplied to the anode electrode 30 are consumed by electrochemical reactions in the first electrode catalyst layer 32 and the second electrode catalyst layer 36 . As a result, electric power can be generated.

[0080] Then, if Figure 1 As shown, the oxidant gas supplied to the cathode electrode 28 and consumed flows from the oxidant gas flow path 56 to the oxidant gas discharge passage 48b. After the oxidant gas flows through the oxidant gas discharge passage 48b, it is discharged in the direction of arrow A along the oxidant gas discharge passage 48b. Similarly, the fuel gas supplied to the anode electrode 30 and consumed flows from the fuel gas flow path 92 to the fuel gas discharge passage 52b. After the fuel gas flows through the fuel gas discharge passage 52b, it is discharged in the direction of arrow A along the fuel gas discharge passage 52b.

[0081] In addition, the cooling medium supplied to the cooling medium supply passage 50a is introduced into the cooling medium flow path 126 formed between the first separator body 54 and the second separator body 90. After being introduced into the cooling medium flow path 126, the cooling medium flows in the direction of arrow B. After cooling the MEA 22, the cooling medium is discharged from the cooling medium discharge passage 50b.

[0082] This embodiment has the following effects.

[0083] The first bypass sealing member 83 is mounted on the protruding end surface of the plurality of first bypass preventing convex portions 70 so as to be located outside the cathode electrode 28. The second bypass sealing member 122 is mounted on the protruding end surface of the plurality of second bypass preventing convex portions 108 so as to be located outside the anode electrode 30.

[0084] According to this structure, the oxidant gas is effectively prevented from flowing into the first bypass flow path 72 by the plurality of first bypass blocking convex portions 70 and the plurality of first bypass sealing members 83. Thus, it is possible to prevent the flow rate of the oxidant gas flowing in the oxidant gas flow path 56 from decreasing. Therefore, even when liquid water generated at the cathode electrode 28 during power generation is retained in the oxidant gas flow path 56, the liquid water in the oxidant gas flow path 56 can be smoothly discharged by the oxidant gas.

[0085] In addition, the inflow of the fuel gas into the second bypass flow path 110 can be effectively suppressed by the plurality of second bypass blocking convex portions 108 and the plurality of second bypass sealing members 122. Accordingly, the flow rate of the fuel gas flowing in the fuel gas flow path 92 can be suppressed from decreasing. Therefore, even when the liquid water generated at the cathode electrode 28 diffuses back toward the anode electrode 30 during power generation and is retained in the fuel gas flow path 92, the liquid water in the fuel gas flow path 92 can be smoothly discharged by the fuel gas. Therefore, the power generation can be stabilized.

[0086] The protruding end surface of each first bypass preventing convex portion 70 includes a first inner end surface 78 and a first outer end surface 80. The first inner end surface 78 faces the outer peripheral portion 29 of the cathode electrode 28. The first outer end surface 80 is located outside the cathode electrode 28 in a state separated from the resin frame portion 24. A plurality of first bypass sealing members 83 are respectively attached to the plurality of first outer end surfaces 80.

[0087] In addition, a gap may be generated between the outer surface 29a of the outer peripheral portion 29 of the cathode electrode 28 and the first inner end surface 78 of the plurality of first bypass preventing convex portions 70 due to a dimensional error between the resin frame portion 24 and the plurality of first bypass preventing convex portions 70. According to this structure, even when such a gap is generated, the plurality of first bypass sealing members 83 can suppress the oxidant gas from flowing into the first bypass flow path 72 through the gap.

[0088] The protruding end surface of each second bypass preventing convex portion 108 includes a second inner end surface 116 and a second outer end surface 118. The second inner end surface 116 faces the outer peripheral portion 31 of the anode electrode 30. The second outer end surface 118 is located outside the anode electrode 30 in a state separated from the resin frame portion 24. The plurality of second bypass sealing members 122 are respectively attached to the plurality of second outer end surfaces 118.

[0089] In addition, a gap may be generated between the outer surface 31a of the outer peripheral portion 31 of the anode electrode 30 and the second inner end surface 116 of the plurality of second bypass blocking convex portions 108 due to a dimensional error between the resin frame portion 24 and the plurality of second bypass blocking convex portions 108. According to this structure, even when such a gap is generated, the plurality of second bypass sealing members 122 can suppress the fuel gas from flowing into the second bypass flow path 110 through the gap.

[0090] Each of the first bypass sealing members 83 is in contact with or close to the cathode electrode 28 . Each of the second bypass sealing members 122 is in contact with or close to the anode electrode 30 .

[0091] According to this configuration, the plurality of first bypass sealing members 83 can more effectively suppress the oxidant gas from flowing into the first bypass flow path 72 . In addition, the plurality of second bypass sealing members 122 can more effectively suppress the fuel gas from flowing into the second bypass flow path 110 .

[0092] Each first bypass sealing member 83 is located between the outer peripheral portion 29 of the cathode electrode 28 and the inner side portion 66a of the first sealing rib portion 66. Each second bypass sealing member 122 is located between the outer peripheral portion 31 of the anode electrode 30 and the inner side portion 104a of the second sealing rib portion 104.

[0093] According to this configuration, the plurality of first bypass sealing members 83 can more effectively suppress the oxidant gas from flowing into the first bypass flow path 72 . In addition, the plurality of second bypass sealing members 122 can more effectively suppress the fuel gas from flowing into the second bypass flow path 110 .

[0094] Each of the first bypass sealing members 83 is made of a rubber material. Each of the second bypass sealing members 122 is made of a rubber material.

[0095] According to this configuration, the plurality of first bypass sealing members 83 can effectively suppress the oxidant gas from flowing into the first bypass flow path 72 . In addition, the plurality of second bypass sealing members 122 can more effectively suppress the fuel gas from flowing into the second bypass flow path 110 .

[0096] Each of the first bypass sealing members 83 is close to the outer surface 42a of the second frame-shaped sheet 42. Each of the second bypass sealing members 122 is close to the outer surface 40a of the first frame-shaped sheet 40.

[0097] According to this configuration, the plurality of first bypass sealing members 83 can more effectively suppress the oxidant gas from flowing into the first bypass flow path 72 . In addition, the plurality of second bypass sealing members 122 can more effectively suppress the fuel gas from flowing into the second bypass flow path 110 .

[0098] The first flow path sealing portion 64 includes a first resin sealing member 68 mounted on the protruding end surface of the first sealing rib portion 66. The constituent material of the first bypass sealing member 83 is the same as the constituent material of the first resin sealing member 68. The second flow path sealing portion 102 includes a second resin sealing member 106 mounted on the protruding end surface of the second sealing rib portion 104. The constituent material of the second bypass sealing member 122 is the same as the constituent material of the second resin sealing member 106.

[0099] According to this structure, when the resin material constituting the first resin sealing member 68 is attached to the protruding end surface of the first sealing rib portion 66, the resin material is also attached to the first outer end surface 80, so that the first bypass sealing member 83 can be effectively formed. In addition, when the resin material constituting the second resin sealing member 106 is attached to the protruding end surface of the second sealing rib portion 104, the resin material is also attached to the second outer end surface 118, so that the second bypass sealing member 122 can be effectively formed.

[0100] The plurality of first bypass blocking convex portions 70 are arranged along the flow direction of the oxidant gas in the oxidant gas flow path 56. The first bypass sealing member 83 is mounted on at least the first bypass blocking convex portion 70 closest to the inlet of the oxidant gas flow path 56 among the plurality of first bypass blocking convex portions 70. The plurality of second bypass blocking convex portions 108 are arranged along the flow direction of the fuel gas in the fuel gas flow path 92. The second bypass sealing member 122 is mounted on at least the second bypass blocking convex portion 108 closest to the inlet of the fuel gas flow path 92 among the plurality of second bypass blocking convex portions 108.

[0101] This configuration can effectively prevent the oxidant gas from flowing into the first bypass flow path 72 from the upstream side of the oxidant gas flow path 56. Also, it can effectively prevent the fuel gas from flowing into the second bypass flow path 110 from the upstream side of the fuel gas flow path 92.

[0102] The first bypass preventing convex portion 70 extends so as to connect the first end flow path protrusion 58a and the inner side portion 66a of the first sealing rib portion 66. The first recessed portion 82 is located in a portion of the first outer end surface 80 adjacent to the first sealing rib portion 66. The second bypass preventing convex portion 108 extends so as to connect the second end flow path protrusion 94a and the inner side portion 104a of the second sealing rib portion 104. The second recessed portion 120 is located in a portion of the second outer end surface 118 adjacent to the second sealing rib portion 104.

[0103] According to this structure, the rigidity of the inner side portion 66a of the first sealing rib portion 66 can be reduced compared to the case without the first recessed portion 82, so that the first sealing rib portion 66 can be easily elastically deformed by the compressive load. In addition, the rigidity of the inner side portion 104a of the second sealing rib portion 104 can be reduced compared to the case without the second recessed portion 120, so that the second sealing rib portion 104 can be easily elastically deformed by the compressive load.

[0104] The present embodiment is not limited to the above-mentioned structure. In the power generation cell 10, the plurality of first bypass sealing members 83 or the plurality of second bypass sealing members 122 may be omitted. In other words, the power generation cell 10 may include only one of the plurality of first bypass sealing members 83 and the plurality of second bypass sealing members 122.

[0105] The present invention is not limited to the above-described embodiment, and various configurations may be employed without departing from the gist of the present invention.

[0106] The above implementation modes are summarized as follows.

[0107] The above embodiment discloses a power generation cell (10), which has a membrane electrode assembly (22), a resin frame (24) and two separator components (16, 18), wherein the membrane electrode assembly (22) includes an electrolyte membrane (26) and two electrodes (28, 30) arranged on both sides of the electrolyte membrane; the resin frame (24) is arranged on the outer periphery of the membrane electrode assembly in a manner of protruding outward from the outer periphery; the two separator components (16, 18) are arranged on both sides of the membrane electrode assembly, and the two separator components respectively have a metal plate-shaped separator body (54, 90), and the separator body has a reaction gas flow path (56, 92) and a flow path sealing part (64, 102), wherein the reaction gas flow path (56, 92) is for the reaction gas to flow from one end of the separator body to the other end along the power generation area (46) of the electrode. ) flows, the flow path sealing portion (64, 102) surrounds the reaction gas flow path in a state of contact with the resin frame portion to prevent leakage of the reaction gas, the flow path sealing portion includes a sealing rib portion (66, 104), the sealing rib portion (66, 104) is integrally formed on the partition body in a manner of protruding from the partition body and elastically deformed by a compressive load in the thickness direction of the partition, on the partition body, a bypass prevention convex portion (70, 108) is integrally formed in a manner of protruding toward the membrane electrode assembly, the bypass prevention convex portion (70, 108) is used to prevent the reaction gas from flowing into between the end portion (58a, 94a) of the reaction gas flow path in the flow path width direction and the flow path sealing portion, and a bypass sealing component (83, 122) is provided on the protruding end surface of the bypass prevention convex portion in a manner of being located at a position closer to the outside than the electrode.

[0108] In the above-mentioned power generation cell, the protruding end face of the bypass-preventing convex portion may include an inner end face (78, 116) and an outer end face (80, 118), wherein the inner end face (78, 116) faces the outer periphery of the electrode; the outer end face (80, 118) is located at a position further outward than the electrode when away from the resin frame portion, and the bypass sealing component is arranged on the outer end face.

[0109] In the above power generation cell, the bypass sealing member may be in contact with or close to one of the two electrodes.

[0110] In the above power generation cell, the bypass sealing member may be located between the outer peripheral portion of one of the two electrodes and the inner side portion (66a, 104a) of the sealing rib portion.

[0111] In the above power generation cell, the bypass sealing member may be made of a rubber material.

[0112] In the above power generation cell, the bypass sealing member may be close to an outer surface (40a, 42a) of the resin frame.

[0113] In the above-mentioned power generation cell, the flow path sealing portion may include a resin sealing component (68, 106), the resin sealing component (68, 106) is arranged on the protruding end surface of the sealing rib portion, and the constituent material of the bypass sealing component is the same as the constituent material of the resin sealing component.

[0114] In the above-mentioned power generation cell, the bypass preventing convex portions may be provided in plurality along the flow direction of the reaction gas in the reaction gas flow path, and the bypass sealing component may be provided on at least the bypass preventing convex portion closest to the inlet of the reaction gas flow path among the plurality of bypass preventing convex portions.

[0115] In the above-mentioned power generation cell, the bypass-blocking convex portion may extend in a manner connecting the end portion in the flow path width direction and the inner side portion of the sealing rib portion, and a portion of the protruding end surface adjacent to the inner side portion of the sealing rib portion may have a recess (82, 120).

Claims

1. A power generation cell (10), comprising a membrane electrode assembly (22), a resin frame (24), and two separator members (16, 18), wherein: The membrane electrode assembly (22) includes an electrolyte membrane (26) and two electrodes (28, 30) arranged on both sides of the electrolyte membrane; the resin frame (24) is provided on the outer periphery of the membrane electrode assembly in a manner protruding outward from the outer periphery; the two separator components (16, 18) are arranged on both sides of the membrane electrode assembly, The power generation cell is characterized in that The two partition members each have a partition body (54, 90) in the form of a metal plate. The separator body comprises a reaction gas flow path (56, 92) and a flow path sealing portion (64, 102), wherein: The reaction gas flow path (56, 92) allows the reaction gas to flow from one end of the separator body to the other end along the power generation area (46) of the electrode. The flow path sealing portion (64, 102) surrounds the reaction gas flow path in a state of being in contact with the resin frame portion to prevent leakage of the reaction gas. The flow path sealing portion includes a sealing rib portion (66, 104) which is integrally formed with the partition body in a manner that protrudes from the partition body and is elastically deformed by a compressive load in the partition thickness direction. A bypass-preventing convex portion (70, 108) is integrally formed on the separator body in a manner protruding toward the membrane electrode assembly, and the bypass-preventing convex portion (70, 108) is used to prevent the reaction gas from flowing between the end portion (58a, 94a) in the flow path width direction of the reaction gas flow path and the flow path sealing portion. A bypass sealing component (83, 122) is provided on the protruding end surface of the bypass preventing convex portion so as to be located outside the electrode. The bypass sealing member is close to the outer surface (40a, 42a) of the resin frame portion and is separated from the flow path sealing portion.

2. The power generation cell according to claim 1, characterized in that: The protruding end surface of the bypass-preventing convex portion includes an inner end surface (78, 116) and an outer end surface (80, 118), wherein: The inner end surface (78, 116) faces the outer periphery of the electrode; The outer end surface (80, 118) is located outside the electrode in a state of being away from the resin frame. The bypass sealing component is disposed on the outer end surface.

3. The power generation cell according to claim 1, characterized in that: The bypass sealing member is in contact with or close to one of the two electrodes.

4. The power generation cell according to claim 1, characterized in that: The bypass sealing member is located between the outer peripheral portion of one of the two electrodes and the inner side portion (66a, 104a) of the sealing rib portion.

5. The power generation cell according to claim 1, characterized in that: The bypass sealing member is made of a rubber material.

6. The power generation cell according to claim 1, characterized in that: The flow path sealing portion includes a resin sealing component (68, 106) which is provided on a protruding end surface of the sealing rib portion. The bypass sealing member is made of the same material as the resin sealing member.

7. The power generation cell according to claim 1, characterized in that: The bypass-blocking convex portions are provided in plurality along the flow direction of the reaction gas in the reaction gas flow path. The bypass sealing member is provided on at least the bypass preventing convex portion closest to the inlet of the reaction gas flow path among the plurality of bypass preventing convex portions.

8. The power generation cell according to any one of claims 1 to 7, characterized in that: The bypass-preventing convex portion extends in a manner connecting the end portion in the flow path width direction and the inner side portion of the sealing rib portion. A portion of the protruding end surface adjacent to the inner side portion of the sealing rib portion has a recessed portion (82, 120).

9. The power generation cell according to claim 8, characterized in that: The bypass sealing member is mounted on the bottom surface of the recessed portion.

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