Method for fixing gasket for fuel cell or water electrolysis device, structure for fixing gasket for fuel cell or water electrolysis device, and method for fixing gasket and structure for fixing gasket

Abstract

This method for fixing a gasket for a fuel cell or a water electrolysis device is provided with a surface treatment for treating the surface of a separator along a seal line for fixing the gasket. The surface treatment has a first surface treatment for roughening the surface and a second surface treatment for roughening the surface. The first surface treatment is a treatment for forming nano-order irregularities, and the second surface treatment is a treatment for forming micro-order irregularities. The first surface treatment is performed simultaneously with the second surface treatment or before the second surface treatment.

Description

Method for Fixing Gasket for Fuel Cell or Water Electrolysis Device, Fixing Structure for Gasket for Fuel Cell or Water Electrolysis Device, and Method for Fixing Gasket and Fixing Structure for Gasket ,

[0006] ,

[0005] ,

[0001] The present invention relates to a method for fixing a gasket for a fuel cell or a water electrolysis device, a fixing structure for a gasket for a fuel cell or a water electrolysis device, and a method for fixing a gasket and a fixing structure for a gasket.

[0002] Conventionally, in order to seal a space, a gasket has been used as a sealing device for sealing a gap between members. For example, in a fuel cell of a fuel cell or a cell of a water electrolysis device, a gasket is used to seal a space between an electrode member and a separator facing the electrode member or a space between a pair of opposing separators to seal a reaction gas or a cooling medium (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2020-061250

[0004] Such a gasket has conventionally been fixed to the surface of a separator by adhesion using an adhesive. The adhesion is performed by applying an adhesive along a seal line on the separator and baking it. The position and area where the adhesive is applied may affect the adhesive strength, and the application of the adhesive needs to be performed carefully. For example, when the application area of the adhesive is narrower than the width of the gasket, the adhesive strength may decrease, and the seal performance may also decrease. Also, when the application position of the adhesive is misaligned and the adhesive protrudes beyond the gasket, the adhesive strength may decrease due to the exposure of the adhesive. Further, when the adhesive protrudes beyond the gasket, even the burrs of the gasket are adhered, making deburring difficult.

[0005] Thus, the conventional fixing of the gasket with an adhesive has needed to be carefully performed so as not to affect the fixing force. For this reason, there has been a demand for a process or configuration that can facilitate the fixing process without affecting the fixing force with respect to the conventional gasket fixing method and fixing structure.

[0006] The present invention has been made in view of the above-mentioned problems, and its object is to provide a method for fixing a gasket for a fuel cell or water electrolyzer, a fixing structure for a gasket for a fuel cell or water electrolyzer, and a method for fixing a gasket and a fixing structure for a gasket, which can suppress the effect of the fixing process on the fixing force and facilitate the fixing process.

[0007] To achieve the above objective, the method for fixing a gasket for a fuel cell or water electrolysis device according to the present invention includes a surface treatment for treating the surface of a separator along a seal line for fixing the gasket, wherein the surface treatment comprises a first surface treatment for roughening the surface and a second surface treatment for roughening the surface, the first surface treatment being a treatment that forms nano-order irregularities, and the second surface treatment being a treatment that forms micro-order irregularities, and the first surface treatment is performed simultaneously with or before the second surface treatment.

[0008] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the second surface treatment is performed in a narrower area than the first surface treatment.

[0009] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the second surface treatment is performed over a wider area than the first surface treatment.

[0010] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the first surface treatment is performed on a plurality of regions, the second surface treatment is performed on a plurality of regions, and the plurality of regions on which the first surface treatment is performed and the plurality of regions on which the second surface treatment is performed are adjacent to each other.

[0011] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the area in which the second surface treatment is performed overlaps with a part of the area in which the first surface treatment is performed.

[0012] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the first surface treatment and the second surface treatment are blast treatments.

[0013] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the first surface treatment is a process of transferring nano-order irregularities to the surface, and the second surface treatment is a process of transferring micro-order irregularities to the surface.

[0014] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the first surface treatment is a process of installing a first member, which is a member having nano-order irregularities on its surface, on the surface, and the second surface treatment is a process of installing a second member, which is a member having micro-order irregularities on its surface, on the surface.

[0015] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the first surface treatment is a process of irradiating the surface with a first laser having a wavelength on the nano-order, and the second surface treatment is a process of irradiating the surface with a second laser having a wavelength on the micro-order.

[0016] In a method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention, the first laser is tilted at an angle of 10° with respect to the second laser, and in the first surface treatment and the second surface treatment, the first laser and the second laser are irradiated simultaneously at the same position.

[0017] A method for fixing a gasket for a fuel cell or water electrolysis device according to one aspect of the present invention further comprises a molding process for forming the gasket on the surface that has undergone the first surface treatment and the second surface treatment.

[0018] To achieve the above objective, the fixing structure for a fuel cell or water electrolysis device gasket according to the present invention comprises a separator, the separator having a first surface portion with nano-order irregularities formed along a seal line to which the gasket is fixed, and a second surface portion with micro-order irregularities formed on its surface, the first surface portion having a region that does not overlap with the second surface portion, and the second surface portion having a region that does not overlap with the first surface portion.

[0019] In a fixing structure for a fuel cell or water electrolysis device according to one aspect of the present invention, the separator has a plurality of first surface portions and a plurality of second surface portions, and the first surface portions and the second surface portions are adjacent to each other.

[0020] In a fixing structure for a fuel cell or water electrolysis device according to one aspect of the present invention, the second surface portion overlaps a part of the first surface portion.

[0021] In a fixing structure for a fuel cell or water electrolysis device according to one aspect of the present invention, one of the regions of the first surface portion and the second surface portion is narrower than the other of the regions of the first surface portion and the second surface portion.

[0022] A fixing structure for a fuel cell or water electrolysis device according to one aspect of the present invention further comprises a gasket, the gasket being formed on the first surface portion and the second surface portion.

[0023] To achieve the above objective, the gasket fixing method according to the present invention includes a surface treatment for treating the surface of a film along a seal line for fixing the gasket, wherein the surface treatment comprises a first surface treatment for roughening the surface and a second surface treatment for roughening the surface, the first surface treatment being a treatment for forming nano-order irregularities, and the second surface treatment being a treatment for forming micro-order irregularities, and the first surface treatment is performed simultaneously with or before the second surface treatment.

[0024] To achieve the above objective, the gasket fixing structure according to the present invention comprises a film, the film having a first surface portion with nano-order irregularities formed along a seal line to which the gasket is fixed, and a second surface portion with micro-order irregularities formed on its surface, the first surface portion having a region that does not overlap with the second surface portion, and the second surface portion having a region that does not overlap with the first surface portion.

[0025] The method for fixing a gasket for a fuel cell or water electrolysis device, the fixing structure for a gasket for a fuel cell or water electrolysis device, and the method and structure for fixing a gasket according to the present invention make it possible to suppress the effect of the fixing process on the fixing force and to make the fixing process easier.

[0026] This is an exploded perspective view of a fuel cell in which fuel cell cells to which a gasket fixing structure according to an embodiment of the present invention are applied are stacked. This is an exploded perspective view of a fuel cell in which fuel cell cells to which a gasket fixing structure according to an embodiment of the present invention are applied are stacked. This is a plan view showing the schematic configuration of a separator to which a gasket is fixed. This is a cross-sectional view showing a cross section along line A-A in Figure 3. This is a cross-sectional view showing an example of a modified gasket fixing structure. This is a cross-sectional view showing an example of a modified gasket fixing structure. This is a cross-sectional view showing an example of a modified gasket fixing structure. This is a cross-sectional view showing an example of a modified gasket fixing structure. This is a cross-sectional view showing an example of a modified gasket fixing structure.

[0027] Embodiments of the present invention will be described below with reference to the drawings. In the drawings, not all of the components are assigned reference numerals, and some of the reference numerals for components may be omitted.

[0028] The present invention relates to a method and structure for fixing gaskets for fuel cells or water electrolysis devices, and more specifically, to a method and structure for fixing a gasket to a separator in each cell of a fuel cell or water electrolysis device gasket. The present invention also relates to a method and structure for fixing a gasket to, for example, a film or a film-like member. Below, the method and structure for fixing a fuel cell gasket will be described in detail as an embodiment of the present invention. A detailed explanation of the method and structure for fixing a gasket to a water electrolysis device will be omitted, but the method and structure for fixing a gasket to a water electrolysis device gasket, as described later, can be similarly applied to fixing a gasket to a separator in a water electrolysis device.

[0029] A method for fixing a fuel cell gasket according to an embodiment of the present invention (hereinafter simply referred to as the gasket fixing method) includes a surface treatment for treating the surface of a separator along a seal line for fixing the gasket. The surface treatment comprises a first surface treatment for roughening the surface and a second surface treatment for roughening the surface. The first surface treatment is a treatment that forms nano-order irregularities, while the second surface treatment is a treatment that forms micro-order irregularities. The first surface treatment is performed simultaneously with or before the second surface treatment.

[0030] Furthermore, the fuel cell gasket fixing structure 1 according to the present invention (hereinafter simply referred to as the gasket fixing structure) includes a separator 2, as shown in Figure 4, which will be described later. The separator 2 has a first surface portion 5 on its surface 2a with nano-order irregularities formed along the seal line 4 to which the gasket 3 is fixed, and a second surface portion 6 with micro-order irregularities formed thereon. The first surface portion 5 has a region that does not overlap with the second surface portion 6, and the second surface portion 6 also has a region that does not overlap with the first surface portion 5.

[0031] The gasket fixing method and gasket fixing structure 1 according to the present invention will be described in detail below.

[0032] Figures 1 and 2 are exploded perspective views of a fuel cell 100 in which fuel cell cells 50 are stacked, as an example of a fuel cell to which a gasket fixing structure according to an embodiment of the present invention is applied. Figures 1 and 2 show one fuel cell cell 50 and a portion of an adjacent fuel cell cell 50. In Figure 1, the fuel cell cell 50 is viewed from one side in the direction in which the fuel cell cells 50 are stacked (hereinafter also referred to as the stacking direction) (direction of arrow a in Figures 1 and 2), and in Figure 2, the fuel cell cell 50 is viewed from the other side in the stacking direction. As shown in Figures 1 and 2, the fuel cell cell 50 has a membrane electrode assembly 61, an insulating member 62 surrounding the membrane electrode assembly 61, and a first separator 70 and a second separator 80 as separators 2 that sandwich the membrane electrode assembly 61 and the insulating member 62 in the stacking direction (direction of arrow a). The insulating member 62 is a frame-shaped member that supports the film electrode assembly 61 on its inner circumference. The film electrode assembly 61 and the insulating member 62 are integrated to form a plate-shaped electrode member 60.

[0033] The membrane electrode assembly 61 has an electrolyte membrane 63 and a pair of catalyst layers, an anode catalyst layer 64 which is the anode side electrode and a cathode catalyst layer 65 which is the cathode side electrode, respectively, provided on both sides of the electrolyte membrane 63. The electrolyte membrane 63 is, for example, an ion exchange membrane, specifically, for example, a solid polymer electrolyte membrane. Gas diffusion layers 66 and 67 are provided on the surfaces of the anode catalyst layer 64 and the cathode catalyst layer 65, respectively. The insulating member 62 is a frame-shaped insulating member, for example, made of resin. As described above, the insulating member 62 supports the membrane electrode assembly 61 on its inner circumference side, and for example, the membrane electrode assembly 61 is joined to the inner circumference end of the insulating member 62. The insulating member 62 is, for example, a rectangular or substantially rectangular frame shape as shown in Figures 1 and 2, and the electrode member 60 is, for example, a rectangular or substantially rectangular plate-shaped member as shown in Figures 1 and 2, and has a pair of opposing surfaces, a front surface 60a and a back surface 60b. Furthermore, the outer peripheral end of the electrode member 60 has four ends 60c, 60d, 60e, and 60f. Ends 60c and 60e face each other, and ends 60d and 60f face each other. For example, ends 60d and 60f extend longer than ends 60c and 60e. As shown in Figures 1 and 2, an anode catalyst layer 64 and a gas diffusion layer 66 are provided on the surface 60a side of the electrode member 60, and a cathode catalyst layer 65 and a gas diffusion layer 67 are provided on the back surface 60b side of the electrode member 60.

[0034] As shown in Figures 1 and 2, the insulating member 62 has six through holes 51a, 52a, 53a, 54a, 55a, and 56a. The six through holes 51a to 56a are through holes for forming a fuel gas supply passage, a cooling medium supply passage, an oxidizer gas supply passage, a fuel gas discharge passage, a cooling medium discharge passage, and an oxidizer gas discharge passage, respectively, in the fuel cell cell 50. As shown in Figures 1 and 2, for example, the through holes 51a, 52a, and 53a are arranged in order along the end 60c of the electrode member 60 (insulating member 62), and the through holes 54a, 55a, and 56a are arranged in order along the end 60e of the electrode member 60 (insulating member 62).

[0035] The first separator 70, in the fuel cell cell 50, faces the membrane electrode assembly 61 in the stacking direction and forms a flow path for the fuel gas. On the other hand, the second separator 80, in the fuel cell cell 50, faces the membrane electrode assembly 61 from the opposite side of the first separator 70 in the stacking direction and forms a flow path for the oxidizer gas. In the fuel cell, between two adjacent fuel cell cells 50 in the stacked fuel cell cells 50, the first separator 70 and the second separator 80 face each other in the stacking direction and form a flow path for the cooling medium between them. The fuel gas is, for example, a hydrogen-containing gas, the oxidizer gas is, for example, an oxygen-containing gas, and the cooling medium is, for example, water.

[0036] The first separator 70 is a rectangular or substantially rectangular plate-shaped member, as shown in Figures 1 and 2, and has a pair of opposing surfaces, a front surface 70a and a back surface 70b, and four ends 70c, 70d, 70e, and 70f. Ends 70c and 70e face each other, and ends 70d and 70f face each other. For example, ends 70d and 70f extend longer than ends 70c and 70e. In this example, in the fuel cell cell 50, the front surface 70a of the first separator 70 faces the front surface 60a of the electrode member 60 and faces the anode catalyst layer 64 and the gas diffusion layer 66. For example, the outer peripheral ends 70c to 70f of the first separator 70 are arranged to coincide with or substantially coincide with the outer peripheral ends 60c to 60f of the electrode member 60 in the stacking direction.

[0037] As shown in Figures 1 and 2, the first separator 70 has six through holes 51b, 52b, 53b, 54b, 55b, and 56b. The six through holes 51b to 56b are through holes for forming a fuel gas supply passage, a cooling medium supply passage, an oxidizer gas supply passage, a fuel gas discharge passage, a cooling medium discharge passage, and an oxidizer gas discharge passage, respectively, in the fuel cell cell 50. As shown in Figures 1 and 2, for example, the through holes 51b, 52b, and 53b are arranged in order along the end 70c of the first separator 70, and the through holes 54b, 55b, and 56b are arranged in order along the end 70e of the first separator 70.

[0038] On the surface 70a of the first separator 70 facing the membrane electrode assembly 61, a fuel gas flow path section 71 is formed, which is a flow path through which fuel gas flows, connecting a fuel gas supply passage and a fuel gas discharge passage. The fuel gas flow path section 71 extends along the ends 70d and 70f, for example, as shown in Figure 2. On the other hand, on the back surface 70b of the first separator 70, as shown in Figure 1, a cooling medium flow path section 72 is formed, which is a flow path through which cooling medium flows, connecting a cooling medium supply passage and a cooling medium discharge passage. The cooling medium flow path section 72 extends along the ends 70d and 70f, for example, as shown in Figure 1. The fuel gas flow path section 71 and the cooling medium flow path section 72 are formed, for example, by forming grooves on the surface 70a and the back surface 70b, respectively.

[0039] The second separator 80 is a rectangular or substantially rectangular plate-shaped member, as shown in Figures 1 and 2, and has a pair of opposing surfaces, a front surface 80a and a back surface 80b, and four ends 80c, 80d, 80e, and 80f. Ends 80c and 80e face each other, and ends 80d and 80f face each other. For example, ends 80d and 80f extend longer than ends 80c and 80e. In this example, in the fuel cell cell 50, the front surface 80a of the second separator 80 faces the back surface 60b of the electrode member 60 and faces the cathode catalyst layer 65 and the gas diffusion layer 67. For example, the outer peripheral ends 80c to 80f of the second separator 80 are arranged to coincide with or substantially coincide with the outer peripheral ends 60c to 60f of the electrode member 60 in the stacking direction.

[0040] As shown in Figure 1, the second separator 80 has six through holes 51c, 52c, 53c, 54c, 55c, and 56c. The six through holes 51c to 56c are through holes for forming a fuel gas supply passage, a cooling medium supply passage, an oxidizer gas supply passage, a fuel gas discharge passage, a cooling medium discharge passage, and an oxidizer gas discharge passage, respectively, in the fuel cell cell. As shown in Figure 1, for example, the through holes 51c, 52c, and 53c are arranged in order along the end 80c of the second separator 80, and the through holes 54c, 55c, and 56c are arranged in order along the end 80e of the second separator 80.

[0041] On the surface 80a of the second separator 80 facing the film electrode assembly 61, an oxidant gas flow path section 81 is formed, which is a flow path through which oxidant gas flows, connecting an oxidant gas supply path and an oxidant gas discharge path. The oxidant gas flow path section 81 extends along the ends 80d and 80f, for example, as shown in Figures 1 and 2. On the other hand, as shown in Figures 1 and 2, a cooling medium flow path section 82 is formed on the back surface 80b of the second separator 80, which forms a flow path through which cooling medium flows, connecting a cooling medium supply path and a cooling medium discharge path. The cooling medium flow path section 82 extends along the ends 80d and 80f, for example, as shown in Figure 2. The oxidant gas flow path section 81 and the cooling medium flow path section 82 are formed, for example, by forming grooves on the surface 80a and back surface 80b, respectively. In the fuel cell 100, between two adjacent fuel cell cells 50 among the stacked fuel cell cells 50, the cooling medium flow path portion 72 of the first separator 70 and the cooling medium flow path portion 82 of the second separator 80 face each other in the stacking direction, and a cooling medium flow path is formed between them.

[0042] The first separator 70 and the second separator 80 are made from a metal or carbon material, for example, from thin metal sheets such as carbon sheets, steel sheets, stainless steel sheets, titanium sheets, aluminum sheets, or plated steel sheets. Furthermore, for example, the metal surfaces of the first separator 70 and the second separator 80 are treated with a corrosion-resistant surface treatment.

[0043] The through-holes 51a to 56a of the electrode member 60, the through-holes 51b to 56b of the first separator 70, and the through-holes 51c to 56c of the second separator 80 are formed so as to overlap each other when viewed in the stacking direction in the fuel cell 50. Thereby, a fuel gas supply path, a cooling medium supply path, and an oxidant gas supply path are formed by the through-holes 51a, 51b, 51c, by the through-holes 52a, 52b, 52c, and by the through-holes 53a, 53b, 53c, respectively. Also, a fuel gas discharge path, a cooling medium discharge path, and an oxidant gas discharge path are formed by the through-holes 54a, 54b, 54c, by the through-holes 55a, 55b, 55c, and by the through-holes 56a, 56b, 56c, respectively. Further, in the fuel cell, the fuel cells 50 are stacked, and the fuel gas supply path, the oxidant gas supply path, the cooling medium supply path, the fuel gas discharge path, the oxidant gas discharge path, and the cooling medium discharge path of each fuel cell 50 are communicated with each other, whereby a fuel gas supply manifold, an oxidant gas supply manifold, a cooling medium supply manifold, a fuel gas discharge manifold, an oxidant gas discharge manifold, and a cooling medium discharge manifold are formed.

[0044] Also, as shown in FIGS. 1 and 2, gaskets 10, 20, 30 as the gasket 2 are provided on the first separator 70 and the second separator 80. The gaskets 10, 20, 30 are formed of an elastic material. The elastic material forming the gaskets 10, 20, 30 is, for example, an elastomer such as rubber. Examples of the elastomer include silicone rubber such as VQM, EPDM (ethylene propylene diene monomer) rubber, fluorine rubber (FKM), and the like. The shapes of the cross-sections orthogonal to the extending directions of the gaskets 10, 20, 30 are the same or substantially the same as each other.

[0045] The gasket 10 is a gasket for sealing the fuel gas and is provided on the surface 70a of the first separator 70, protruding from the surface 70a and facing the surface 60a of the electrode member 60. The gasket 10 protrudes from the surface 70a more than the height in the stacking direction of the fuel gas passage 71 formed in the first separator 70. The tip of the gasket 10 contacts the surface 62a of the insulating member 62 of the electrode member 60 in the fuel cell cell 50, so that the gasket 10 seals the fuel gas. Specifically, as shown in Figure 2, the gasket 10 surrounds the through holes 51b, 54b and the fuel gas passage portion 71 on the surface 70a of the first separator 70, and also surrounds the through holes 52b, 53b, 55b, and 56b respectively. The surface 62a of the insulating member 62 is the portion of the insulating member 62 that is the surface 60a of the electrode member 60.

[0046] As described above, in the fuel cell cell 50, the surface 70a of the first separator 70 faces the surface 60a of the electrode member 60, the membrane electrode assembly 61 faces the fuel gas flow path 71, and the through holes 51a to 56a of the electrode member 60 each face the through holes 51b to 56b of the first separator 70 in the stacking direction. For this reason, each component of the electrode member 60 is similarly surrounded by the gasket 10 that is in contact with the surface 62a of the insulating member 62 of the electrode member 60. In other words, the membrane electrode assembly 61 and the through holes 51a and 54a are surrounded by the gasket 10, and the through holes 52a, 53a, 55a, and 56a are also surrounded, respectively. As a result, the gasket 10 seals the fuel gas supply passage (through holes 51a, 51b), the fuel gas flow path 71, and the fuel gas discharge passage (through holes 54a, 54b) between the electrode member 60 and the first separator 70, thereby sealing the fuel gas.

[0047] The gasket 20 is a gasket for sealing the oxidant gas, and is provided on the surface 80a of the second separator 80, protruding from the surface 80a and facing the back surface 60b of the electrode member 60. The gasket 20 protrudes from the surface 80a more than the height in the stacking direction of the oxidant gas flow path 81 formed in the second separator 80. The tip of the gasket 20 contacts the back surface 62b of the insulating member 62 of the electrode member 60 in the fuel cell 50, and the gasket 20 seals the oxidant gas. Specifically, as shown in FIG. 1, the gasket 20 surrounds the through holes 53c, 56c and the oxidant gas flow path portion 81 on the surface 80a of the second separator 80, and also surrounds the through holes 51c, 52c, 54c, 55c respectively. Note that the back surface 62b of the insulating member 62 is the portion of the back surface 60b of the electrode member 60 in the insulating member 62.

[0048] As described above, in the fuel cell 50, the surface 80a of the second separator 80 faces the back surface 60b of the electrode member 60, the membrane electrode assembly 61 faces the oxidant gas flow path portion 81, and the through holes 51c to 56c of the electrode member 60 face the through holes 51c to 56c of the second separator 80 in the stacking direction respectively. Therefore, each component of the electrode member 60 is similarly surrounded by the gasket 20 that contacts the back surface 62b of the insulating member 62 of the electrode member 60. That is, the gasket 20 surrounds the membrane electrode assembly 61 and the through holes 53a, 56a, and also surrounds the through holes 51a, 52a, 54a, 55a respectively. Thereby, between the electrode member 60 and the second separator 80, the gasket 20 seals the flow path of the oxidant gas between the oxidant gas supply path (through holes 53a, 53c), the oxidant gas flow path portion 81, and the oxidant gas discharge path (through holes 56a, 56c), and the oxidant gas is sealed.

[0049] The gasket 30 is a gasket for sealing the cooling medium and is provided on the back surface 70b of the first separator 70. It protrudes from the back surface 70b and faces the back surface 80b of the second separator 80 of the adjacent fuel cell cell 50. The gasket 30 protrudes from the back surface 70b more than the sum of the height in the stacking direction of the cooling medium flow path 72 formed in the first separator 70 and the height in the stacking direction of the cooling medium flow path 82 formed in the second separator 80. In the fuel cell 100, the tip of the gasket 30 contacts the back surface 80b of the second separator 80 of the adjacent fuel cell cell 50, so that the gasket 30 seals the cooling medium. Specifically, as shown in Figure 1, the gasket 30 surrounds the through holes 52b, 55b and the cooling medium flow path portion 72 on the back surface 70b of the first separator 70, and also surrounds the through holes 51b, 53b, 54b, and 56b, respectively.

[0050] As described above, in the fuel cell 100, the back surface 70b of one of the two adjacent fuel cell cells 50 is opposite the back surface 80b of the other of the two adjacent fuel cell cells 50, the cooling medium flow path 72 and the cooling medium flow path 82 are opposite each other, and the through holes 51c to 56c of the second separator 80 are opposite each other in the stacking direction. Therefore, each component of the second separator 80 is similarly surrounded by the gasket 30 that is in contact with the back surface 80b of the second separator 80. In other words, the cooling medium flow path 82 and the through holes 52c and 55c are surrounded by the gasket 30, and the through holes 51c, 53c, 54c and 56c are also surrounded, respectively. As a result, the gasket 30 seals the cooling medium flow path between the first separator 70 and the second separator 80, between the cooling medium supply passage (through holes 52b, 52c), the cooling medium flow path sections 72, 82, and the cooling medium discharge passage (through holes 55b, 55c), thereby sealing the cooling medium.

[0051] As described above, in the fuel cell cell 50 of the fuel cell 100, the gaskets 10, 20, and 30, which serve as gaskets 3, are each fixed to the first separator 70 or the second separator 80, which serve as separators 2. The fixing of each of the gaskets 10, 20, and 30 to the first separator 70 or the second separator 80 is performed by the gasket fixing method according to an embodiment of the present invention, and a gasket fixing structure 1 according to an embodiment of the present invention is provided between each of the gaskets 10, 20, and 30 and the first separator 70 or the second separator 80. Hereinafter, the gasket fixing structure 1 and the gasket fixing method according to an embodiment of the present invention will be described comprehensively as a fixing structure and fixing method between the separator 2 and the gasket 3.

[0052] Figure 3 is a plan view showing the schematic configuration of a separator 2 to which a gasket 3 is fixed. For convenience, the separator 2 is assumed to have the configuration of a first separator 70. The gasket 3 extends along the seal line 4 on the surface 2a or back surface 2b of the separator 2. In other words, the gasket fixing structure 1 extends along the seal line 4. When the separator 2 is the first separator 70, on the surface 2a, the seal line 4 extends to form the above-mentioned gasket 10, and the gasket 3 constitutes the gasket 10. On the other hand, on the back surface 2b, the seal line 4 extends to form the above-mentioned gasket 30, and the gasket 3 constitutes the gasket 30. When the separator 2 is the second separator 80, on the surface 2a, the seal line 4 extends to form the above-mentioned gasket 20, and the gasket 3 constitutes the gasket 20. As an example, in the separator 2 shown in the figure, the gasket 3 extends along the seal line 4 that forms the gasket 10.

[0053] Figure 4 is a cross-sectional view showing a cross-section along line A-A in Figure 3, and shows a cross-section with a plane perpendicular to the extension direction of the seal line 4 or gasket 3. The extension direction of the seal line 4 is the direction in which the seal line 4 extends, and the extension direction of the gasket 3 is the direction in which the gasket 3 extends along the seal line 4. The gasket fixing structure 1 extends along the seal line 4, and as shown in Figure 4, the gasket fixing structure 1 has a first surface portion 5 and a second surface portion 6 formed on the surface 2a of the separator 2. As described above, the first surface portion 5 is the portion of the surface 2a in which nano-order irregularities are formed, and the second surface portion 6 is the portion of the surface 2a in which micro-order irregularities are formed. Nano-order irregularities are, for example, irregularities in which the arithmetic mean height Sa is in the nanometer range, and micro-order irregularities are, for example, irregularities in which the arithmetic mean height Sa is in the micrometer range.

[0054] The first surface portion 5 is formed by a first surface treatment in the gasket fixing method described later. As described above, the first surface treatment is a process that forms nano-order irregularities on the surface 2a. On the other hand, the second surface portion 6 is formed by a second surface treatment in the gasket fixing method described later. As described above, the second surface treatment is a process that forms micro-order irregularities on the surface 2a.

[0055] As shown in Figure 4, the gasket fixing structure 1 in the separator 2 has, for example, multiple first surface portions 5 and multiple second surface portions 6. Furthermore, the first surface portions 5 and the second surface portions 6 are adjacent to each other. As an example, as shown in Figure 4, the gasket fixing structure 1 has two first surface portions 5 and two second surface portions 6, and the first surface portions 5 and the second surface portions 6 are adjacent to each other. In other words, the first surface portions 5 and the second surface portions 6 each extend along the seal line 4, and the first surface portions 5 and the second surface portions 6 are arranged alternately in a direction perpendicular to the seal line 4. In the example in Figure 4, the first surface portions 5 are located on the end side of the separator 2, but the second surface portions 6 may also be located on the end side of the separator 2.

[0056] In the example shown in Figure 4, the gasket fixing structure 1 has an equal number of first surface portions 5 and second surface portions 6. However, the number of first surface portions 5 and second surface portions 6 in the gasket fixing structure 1 may be different from each other. In other words, in the gasket fixing structure 1, the number of first surface portions 5 may be greater than the number of second surface portions 6, and the number of first surface portions 5 may be less than the number of second surface portions 6. Furthermore, the gasket fixing structure 1 may have only one of either the first surface portions 5 or the second surface portions 6, or both.

[0057] In the example shown in Figure 4, the width w1 of the first surface portion 5 and the width w2 of the second surface portion 6 are the same or approximately the same. The width w1 is the width of the first surface portion 5 in a direction perpendicular to the extension direction of the seal line 4, and similarly, the width w2 is the width of the second surface portion 6 in a direction perpendicular to the seal line 4.

[0058] As shown in Figure 4, the gasket 3 is formed on the first surface portion 5 and the second surface portion 6. The fixing portion 3b of the gasket 3 fits into the irregularities of the first surface portion 5 and makes contact with the irregularities of the first surface portion 5, and also fits into the irregularities of the second surface portion 6 and makes contact with the irregularities of the second surface portion 6. The fixing portion 3b of the gasket 3 is the end on the side to which the gasket 3 is fixed.

[0059] The gasket fixing structure 1 has the above-described configuration and firmly fixes the gasket 3 to the surface 2a of the separator 2. Specifically, the fixing portion 3b of the gasket 3 penetrates into the minute irregularities of the first surface portion 5 and the second surface portion 6 and makes contact with these irregularities, so the gasket fixing structure 1 exhibits an anchoring effect that firmly fixes the gasket. Furthermore, the irregularities of the first surface portion 5 are on the nano-order, and the irregularities of the second surface portion 6 are on the micro-order, so the fixing portion 3b of the gasket 3 penetrates into two types of irregularity regions with different height ranges, making the anchoring effect exhibited by the gasket fixing structure 1 even stronger in fixing the gasket 3. In addition, at the fixing portion 3b of the gasket 3, the first surface portion 5 and the second surface portion 6 are adjacent to each other, which also makes the anchoring effect exhibited by the gasket fixing structure 1 even stronger in fixing the gasket 3.

[0060] Thus, the gasket fixing structure 1 exhibits an anchoring effect that firmly fixes the gasket 3 and the separator 2, and without using other fixing means such as adhesives to fix the gasket 3 and the separator 2, it is possible to form the desired firm fixation between the gasket 3 and the separator 2.

[0061] As described above, the gasket fixing structure 1 according to the embodiment of the present invention does not have fixing means such as adhesive, and can suppress the fixing process for fixing the gasket 3 to the separator 2 from affecting the fixing force, and can also facilitate the fixing process between the gasket 3 and the separator 2.

[0062] Next, a modified example of the gasket fixing structure 1 according to the present invention will be described.

[0063] Figure 5 is a cross-sectional view showing an example of a modified gasket fixing structure 1. Similar to Figure 4, Figure 5 is a cross-sectional view showing a cross-section along line A-A in Figure 3, and shows a cross-section with a plane perpendicular to the extension direction of the seal line 4 or gasket 3. As shown in Figure 5, in the modified gasket fixing structure 1, the width w1 of the first surface portion 5 is larger than the width w2 of the second surface portion 6.

[0064] Figure 6 is a cross-sectional view showing an example of a modified gasket fixing structure 1. Similar to Figure 4, Figure 6 is a cross-sectional view showing a cross-section along line A-A in Figure 3, and shows a cross-section with a plane perpendicular to the extension direction of the seal line 4 or gasket 3. As shown in Figure 6, in the modified gasket fixing structure 1, the width w1 of the first surface portion 5 is smaller than the width w2 of the second surface portion 6.

[0065] Furthermore, in the gasket fixing structure 1, the width w1 of one or more first surface portions 5 and the width w2 of the second surface portions 6 may be smaller than the width w2 of the second surface portion 6, and the width w1 of one or more first surface portions 5 may be larger than the width w2 of the second surface portion 6.

[0066] In the gasket fixing structure 1, for example, the multiple first surface portions 5 may have different widths w1 from each other. Also, for example, a part of the multiple first surface portions 5 may have a different width w1 from the other first surface portions 5. Also, for example, a part or all of the multiple first surface portions 5 having a different width w1 from the other first surface portions 5 may have different widths w1 from each other. Also, for example, the multiple first surface portions 5 may include one or more sets of multiple first surface portions 5 having the same width w1 from each other. Similarly, in the gasket fixing structure 1, for example, the multiple second surface portions 6 may have different widths w2 from each other. Also, for example, a part of the multiple second surface portions 6 may have a different width w2 from the other second surface portions 6. Also, for example, a part or all of the multiple second surface portions 6 having a different width w2 from the other second surface portions 6 may have different widths w2 from each other. Also, for example, the multiple second surface portions 6 may include one or more sets of multiple second surface portions 6 having the same width w2 from each other.

[0067] Figure 7 is a cross-sectional view showing an example of a modified gasket fixing structure 1. Similar to Figure 4, Figure 7 is a cross-sectional view showing a cross-section along line A-A in Figure 3, and shows a cross-section by a plane perpendicular to the extension direction of the seal line 4 or gasket 3. As shown in Figure 7, in the modified gasket fixing structure 1, the second surface portion 6 overlaps a part of the first surface portion 5. Specifically, for example, as shown in Figure 7, the second surface portion 6 is scattered on the first surface portion 5 formed along the seal line 4. In other words, within the nano-order unevenness region of the first surface portion 5 formed along the seal line 4, there are scattered micro-order unevenness regions of multiple small second surface portions 6.

[0068] Furthermore, as shown in Figure 8, in the first surface portion 5 and the second surface portion 6 shown in Figure 4, the adjacent first surface portion 5 and the second surface portion 6 may partially overlap at their boundary. Specifically, a boundary region 7 is formed between the adjacent first surface portion 5 and the second surface portion 6, and within this boundary region 7, the second surface portion 6 is scattered on the first surface portion 5. In other words, within the nano-order irregularities of the boundary region 7 extending to the edge of the first surface portion 5, there are scattered regions of micro-order irregularities of multiple small second surface portions 6.

[0069] Figure 9 is a cross-sectional view showing an example of a modified gasket fixing structure 1, and Figure 7, similar to Figure 4, is a cross-sectional view showing a cross-section along line A-A in Figure 3, and shows a cross-section by a plane perpendicular to the extension direction of the seal line 4 or gasket 3. As shown in Figure 9, the first surface portion 5 and the second surface portion 6 are not formed on the opposing portion 2c, which is the part of the surface 2a of the separator 2 that the backing portion 3c of the gasket 3 faces. The backing portion 3c of the gasket 3 is the fixing portion 3b that faces back to the tip 3a in a direction perpendicular to the surface 2a. The tip 3a of the gasket 3 is the part of the gasket 3 that contacts the opposing electrode member 60 or separator 2 in the fuel cell cell 50. As a result, even if a portion of the gasket 3 loses its fixation to the separator 2 in the fuel cell cell 50, the opposing portion 3c of the fixing portion 3b, which is strongly pressed against the surface 2a, will slide against the irregularities (first surface portion 5 and second surface portion 6) of the separator 2 due to the movement of the gasket 3, thereby preventing or suppressing damage. As a result, even if a portion of the gasket 3 loses its fixation to the separator 2, a decrease in the sealing performance of the gasket 3 can be suppressed.

[0070] Next, a gasket fixing method according to an embodiment of the present invention will be described.

[0071] As described above, the gasket fixing method includes a surface treatment that processes the surface 2a or back surface 2b of the separator 2 along the seal line 4. The surface treatment includes a first surface treatment that forms a first surface portion 5 which has nano-order irregularities, and a second surface treatment that forms a second surface portion 6 which has micro-order irregularities. In the surface treatment, the first surface treatment and the second surface treatment may be performed simultaneously, and the first surface treatment may be performed before the second surface treatment. The gasket fixing method also includes a molding process that forms a gasket 3 on the surface 2a or back surface 2b of the separator 2 formed by the surface treatment.

[0072] The first surface treatment is, for example, a blasting treatment such as sandblasting. Specifically, in the first surface treatment, particulate abrasive material capable of forming nano-order irregularities is projected onto the region forming the first surface portion 5. The first surface treatment is also, for example, a transfer treatment such as stamping or roller transfer. Specifically, in the first surface treatment, a mold or sandpaper with nano-order irregularities formed on it is pressed onto the region forming the first surface portion 5. The first surface treatment is also, for example, a setting treatment. Specifically, in the first surface treatment, a first member, which is a member with nano-order irregularities formed on its surface, is set and fixed onto the region forming the first surface portion 5. The first member is, for example, a thin plate. The first member is fixed by, for example, soldering or welding. The first surface treatment is also, for example, a laser irradiation treatment. Specifically, in the first surface treatment, a first laser with a nano-order wavelength is irradiated onto the region forming the first surface portion 5.

[0073] The second surface treatment is, for example, a blasting treatment such as sandblasting. Specifically, in the second surface treatment, particulate abrasive material capable of forming micro-order irregularities is projected onto the area forming the second surface portion 6. The second surface treatment is also, for example, a transfer treatment such as stamping or roller transfer. Specifically, in the second surface treatment, a mold or sandpaper with micro-order irregularities formed on it is pressed onto the area forming the second surface portion 6. The second surface treatment is also, for example, a setting treatment. Specifically, in the second surface treatment, a second member, which is a member with micro-order irregularities formed on its surface, is set and fixed onto the area forming the second surface portion 6. The second member is, for example, a thin plate. The second member is fixed by, for example, soldering or welding. The second surface treatment is also, for example, a laser irradiation treatment. Specifically, in the second surface treatment, a second laser with a micro-order wavelength is irradiated onto the area forming the second surface portion 6.

[0074] The first surface treatment is performed, for example, on multiple areas of the surface 2a or back surface 2b of the separator 2, and the second surface treatment is performed, for example, on multiple areas of the surface 2a or back surface 2b of the separator 2. Furthermore, for example, the multiple areas where the first surface treatment is performed and the multiple areas where the second surface treatment is performed are adjacent to each other. As a result, for example, as shown in Figure 4, adjacent first surface portions 5 and second surface portions 6 are formed on the separator 2.

[0075] Furthermore, the second surface treatment is performed, for example, on a narrower area than the first surface treatment. As a result, when adjacent first surface portion 5 and second surface portion 6 are formed, as shown in Figure 4, the width w2 of the second surface portion 6 becomes narrower than the width w1 of the first surface portion 5, as shown in Figure 5.

[0076] Furthermore, the second surface treatment is performed over a wider area than the first surface treatment. As a result, when adjacent first surface portions 5 and second surface portions 6 are formed, as shown in Figure 4, the width w2 of the second surface portion 6 becomes wider than the width w1 of the first surface portion 5, as shown in Figure 6.

[0077] Furthermore, the area where the second surface treatment is performed overlaps, for example, with a part of the area where the first surface treatment is performed. As a result, for example, as shown in Figure 7, the second surface portion 6 is scattered on the first surface portion 5 formed along the seal line 4. In other words, multiple micro-order uneven areas of the small second surface portion 6 are scattered within the nano-order uneven areas of the first surface portion 5 formed along the seal line 4. Also, as a result, as shown in Figure 8, a boundary region 7 is formed between the adjacent first surface portion 5 and second surface portion 6, and the second surface portion 6 is scattered on the first surface portion 5 within the boundary region 7. In other words, multiple micro-order uneven areas of the small second surface portion 6 are scattered within the nano-order uneven areas of the boundary region 7 extending to the edge of the first surface portion 5.

[0078] Furthermore, the first and second surface treatments are not applied to the opposing portion 2c, which is the portion of the surface 2a or back surface 2b that faces the opposing portion 3c of the fixing portion 3b that faces away from the tip 3a of the gasket 3. As a result, as shown in Figure 9, the first surface portion 5 and the second surface portion 6 are not formed on the opposing portion 2c, which is the portion of the surface 2a or back surface 2b that faces the opposing portion 3c of the fixing portion 3b that faces away from the tip 3a of the gasket 3.

[0079] Furthermore, if the first and second surface treatments are laser treatments, for example, the first laser is tilted at an angle of 10° relative to the second laser, and in the first and second surface treatments, the first and second lasers are irradiated simultaneously at the same position.

[0080] In the molding process, for example, the gasket 3 is formed on the first surface portion 5 and the second surface portion 6 formed by the first surface treatment and the second surface treatment by injection molding. For example, a mold corresponding to the shape of the gasket 3 is placed on the surface 2a or back surface 2b of the separator 2, and the gasket 3 is formed on the surface 2a or back surface 2b of the separator 2 so as to cover the first surface portion 5 and the second surface portion 6. At this time, the fixing portion 3b of the gasket 3 fits into the irregularities of the first surface portion 5 and the second surface portion 6 and contacts the irregularities of the first surface portion 5 and the second surface portion 6. As a result, a gasket fixing structure 1 is formed that exhibits an anchoring effect that firmly fixes the gasket 3, as described above.

[0081] Thus, the gasket fixing method forms a gasket fixing structure 1 that exhibits an anchoring effect to firmly fix the gasket 3 and the separator 2. Therefore, a desired firm fixation can be formed between the gasket 3 and the separator 2 without using other fixing treatments such as adhesives to fix the gasket 3 and the separator 2.

[0082] As described above, the gasket fixing method 1 according to the embodiment of the present invention does not involve a fixing process using adhesives or the like, which can suppress the effect of the fixing process for fixing the gasket 3 to the separator 2 on the fixing force, and can also facilitate the fixing process between the gasket 3 and the separator 2.

[0083] The gasket fixing method and gasket fixing structure 1 according to the embodiment of the present invention are used to fix the separator 2 and gasket 3 of the fuel cell cell 50 of the fuel cell 100. However, as described above, the gasket fixing method and gasket fixing structure 1 according to the embodiment of the present invention can also be used in a water electrolysis device. In other words, the gasket fixing method and gasket fixing structure 1 according to the embodiment of the present invention are used to fix the separator and gasket in the cell of a water electrolysis device.

[0084] Although the present invention has been described above through the embodiments described above, the technical scope of the present invention is not limited to the scope described in the embodiments above. It will be obvious to those skilled in the art that various modifications or improvements can be made to the embodiments described above. It will be clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention.

[0085] The embodiments described above are for the purpose of facilitating understanding of the present invention and are not intended to limit its interpretation. Furthermore, the embodiments described above do not limit the scope of application of the present invention, and the present invention may encompass anything as its target application. The components of the above embodiments, as well as their arrangement, materials, conditions, shapes, and sizes, are not limited to those exemplified and can be modified as appropriate. For example, the present invention includes differences that arise in the implementation of manufacturing tolerances, etc. Furthermore, components shown in different embodiments can be partially substituted or combined to the extent that they do not contradict each other in a technical sense. In addition, each configuration can be selectively combined as appropriate to achieve at least some of the problems and effects described above.

[0086] For example, the gasket fixing method and gasket fixing structure according to the present invention may be applied to any application that can utilize the effects of the present invention. For instance, the gasket fixing method and gasket fixing structure according to the present invention can be used to fix a gasket to a film or a film-like member.

[0087] 1 Gasket fixing structure, 2, 70, Separator, 2a Surface, 3, 10, 20, 30 Gasket, 3a Tip, 3b Fixing part, 3c Backed part, 4 Seal line, 5 First surface part, 6 Second surface part, 7 Boundary region, 50 Fuel cell, 51a, 51b, 51c, 52a, 52b, 52c, 53a, 53b, 53c, 54a, 54b, 54c, 55a, 55b, 55c, 56a, 56b, 56c Through hole, 60 Electrode member, 60a Surface, 60b Back, 60c, 60d, 60e, 60f End, 61 Membrane electrode assembly, 62 Insulating member, 62a Surface, 62b Back, 63 Electrolyte membrane, 64 Anode catalyst layer, 65 Cathode catalyst layer, 66, 67 Gas diffusion layer, 70 First separator, 70a surface, 70b back surface, 70c, 70d, 70e, 70f ends, 71 Fuel gas flow path section, 72 Cooling medium flow path section, 80 Second separator, 80a surface, 80b back surface, 80c, 80d, 80e, 80f ends, 81 Oxidizer gas flow path section, 82 Cooling medium flow path section, 100 Fuel cell, w1, w2

Claims

1. A method for fixing a gasket for a fuel cell or water electrolysis device, comprising a surface treatment for treating the surface of a separator along a seal line for fixing the gasket, wherein the surface treatment comprises a first surface treatment for roughening the surface and a second surface treatment for roughening the surface, the first surface treatment being a treatment to form nano-order irregularities, the second surface treatment being a treatment to form micro-order irregularities, and the first surface treatment being performed simultaneously with or before the second surface treatment.

2. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, wherein the second surface treatment is performed in a narrower area than the first surface treatment.

3. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, wherein the second surface treatment is performed over a wider area than the first surface treatment.

4. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to any one of claims 1 to 3, wherein the first surface treatment is performed on a plurality of regions, the second surface treatment is performed on a plurality of regions, and the plurality of regions where the first surface treatment is performed and the plurality of regions where the second surface treatment is performed are adjacent to each other.

5. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to any one of claims 1 to 3, wherein the area in which the second surface treatment is performed overlaps with a part of the area in which the first surface treatment is performed.

6. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, wherein the first surface treatment and the second surface treatment are blast treatments.

7. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, wherein the first surface treatment is a process of transferring nano-order irregularities to the surface, and the second surface treatment is a process of transferring micro-order irregularities to the surface.

8. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, wherein the first surface treatment is a process of placing a first member, which is a member having nano-order irregularities on its surface, on the surface, and the second surface treatment is a process of placing a second member, which is a member having micro-order irregularities on its surface, on the surface.

9. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, wherein the first surface treatment is a process of irradiating the surface with a first laser having a wavelength on the nano-order, and the second surface treatment is a process of irradiating the surface with a second laser having a wavelength on the micro-order.

10. The method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 9, wherein the first laser is tilted at an angle of 10° with respect to the second laser, and in the first surface treatment and the second surface treatment, the first laser and the second laser are each irradiated simultaneously at the same position.

11. A method for fixing a gasket for a fuel cell or water electrolysis apparatus according to claim 1, further comprising a molding process for forming the gasket on the surface that has undergone the first surface treatment and the second surface treatment.

12. A fixing structure for a gasket for a fuel cell or water electrolysis device, comprising a separator, wherein the separator has a first surface portion having nano-order irregularities formed along a seal line to which the gasket is fixed, and a second surface portion having micro-order irregularities formed on its surface, the first surface portion having a region that does not overlap with the second surface portion, and the second surface portion having a region that does not overlap with the first surface portion, the fixing structure for a gasket for a fuel cell or water electrolysis device.

13. The separator has a plurality of first surface portions and a plurality of second surface portions, and the first surface portions and the second surface portions are adjacent to each other, the fixing structure for a gasket for a fuel cell or water electrolysis apparatus according to claim 12.

14. The fixing structure for a fuel cell or water electrolysis device gasket according to claim 12, wherein the second surface portion overlaps a part of the first surface portion.

15. A fixing structure for a fuel cell or water electrolysis device gasket according to any one of claims 12 to 14, wherein one of the regions of the first surface portion and the second surface portion is narrower than the other of the regions of the first surface portion and the second surface portion.

16. The fixing structure for a fuel cell or water electrolysis device gasket according to claim 12, further comprising a gasket, the gasket being formed on the first surface portion and the second surface portion.

17. A method for fixing a gasket, comprising a surface treatment for treating the surface of a film along a seal line for fixing the gasket, wherein the surface treatment comprises a first surface treatment for roughening the surface and a second surface treatment for roughening the surface, the first surface treatment being a treatment for forming nano-order irregularities, the second surface treatment being a treatment for forming micro-order irregularities, and the first surface treatment being performed simultaneously with or before the second surface treatment.

18. A gasket fixing structure comprising a film, wherein the film has a first surface portion having nano-order irregularities formed along a seal line to which the gasket is fixed, and a second surface portion having micro-order irregularities formed on its surface, the first surface portion having a region that does not overlap with the second surface portion, and the second surface portion having a region that does not overlap with the first surface portion.

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