Battery cell

Abstract

The battery cell (2) includes: a base material (10) defining a first face (13) and a second face (14) opposite each other; a hole (15) through the base material (10) from the first face (13) to the second face (14); a film (21) disposed within the hole (15), dividing the hole (15) into a first space (17) on the first face (13) side and a second space (18) on the second face (14) side; and an annular outer peripheral member (32) disposed around an outer peripheral face (11a) of the base material (10).

Description

Technical Field

[0001] This invention relates to a battery cell. Background Technology

[0002] For example, Patent Document 1 discloses a water electrolysis device. In this device, electricity is used to decompose water into oxygen and hydrogen, thereby generating hydrogen.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2012-117140 Summary of the Invention

[0004] The problem that the invention aims to solve To improve hydrogen production efficiency, high-pressure hydrogen production is required. However, high-pressure operation necessitates increasing the strength of the water electrolysis unit.

[0005] The present invention was made in view of the above-mentioned problems, and its object is to provide a battery cell that can improve strength.

[0006] Methods for solving problems An embodiment of the present invention relates to a battery cell comprising: a substrate defining a first side and a second side opposite to each other; a hole penetrating the substrate from the first side to the second side; a membrane disposed within the hole, dividing the hole into a first space on the first side and a second space on the second side; and an annular peripheral member disposed around the outer peripheral surface of the substrate.

[0007] In a battery cell according to one embodiment of the present invention, the substrate has: a body having the hole; and a flange portion that protrudes from the outer peripheral surface of the body to the outer peripheral side and supports the outer peripheral component.

[0008] In a battery cell according to one embodiment of the present invention, the thickness of the substrate defined in a direction orthogonal to the first surface is greater than the thickness of the outer peripheral component defined in that direction.

[0009] In a battery cell according to one embodiment of the present invention, the outer peripheral component has: an inner peripheral portion extending around the outer peripheral surface of the substrate; and an outer peripheral portion protruding from the inner peripheral portion toward the outer peripheral side.

[0010] In a battery cell according to one embodiment of the present invention, the substrate is formed of a resin material.

[0011] In a battery cell according to one embodiment of the present invention, the outer peripheral component is formed of a metallic material.

[0012] One embodiment of the present invention includes a battery cell further comprising a conductive flow path component disposed in the first space and the second space.

[0013] One embodiment of the present invention includes a battery cell further comprising a separator disposed on the second surface side and in contact with the flow path component.

[0014] In a battery cell according to one embodiment of the present invention, the membrane is an electrolyte membrane assembled in a water electrolysis device or a fuel cell.

[0015] Invention Effects According to the present invention, it is possible to provide a battery cell with improved strength. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view that schematically shows the structure of the battery cell 2 assembled in the water electrolysis device 1 of a specific example.

[0017] Figure 2 This is a cross-sectional view that schematically shows the structure of the battery cell 2 assembled in the water electrolysis device 1 of a specific example.

[0018] Figure 3 This is a top view of the surface of battery cell 2 with one of the separators removed.

[0019] Figure 4 This is a top view of the rear side of battery cell 2 with the other partition removed.

[0020] Figure 5 This is a cross-sectional view that schematically shows the structure of the battery cell 2A assembled in a water electrolysis device 1 according to a modified example. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 and Figure 2 This is a cross-sectional view that schematically shows the structure of the battery cell 2 assembled in the water electrolysis device 1 of a specific example. Figure 3 This is a top view of the surface of battery cell 2 with one of the separators removed. Figure 4 This is a top view of the rear side of battery cell 2 with the other partition removed. Furthermore, Figure 1 It is along Figure 3 and Figure 4 A sectional view along line 1-1 in the diagram. Figure 2 It is along Figure 3 and Figure 4 The sectional view along line 2-2. Additionally, in Figure 1 and Figure 2In this context, the direction in which multiple battery cells 2 are stacked is defined as the stacking direction a.

[0022] A specific example of a water electrolysis device 1 includes, by means of, Figure 1 and Figure 2 The battery stack shown is formed by stacking one or more battery cells 2 in the stacking direction a. The battery stack includes current collector plates and insulating plates (not shown) further stacked in the stacking direction a relative to the battery cells 2 at both ends. With the current collector plates and insulating plates stacked at their respective ends, the battery stack is secured in the stacking direction a by a pair of end plates (not shown). Thus, the water electrolysis device 1 is assembled.

[0023] The current collector is formed, for example, of an airtight conductive material. Conductive materials include, for example, copper plates. Each current collector has a terminal. Current is supplied to each battery cell 2 from this terminal via the current collector. The insulating plate is formed of an insulating material. Insulating materials include, for example, rubber, resin, etc. The end plate is formed of a metal material. Furthermore, when fastening the end plate, a plurality of bolts extending in the lamination direction a and nuts engaged with these bolts are used.

[0024] Refer to together Figures 1-4 One embodiment of the present invention includes, for example, a battery cell 2 comprising a substrate 10 extending in a predetermined shape along an imaginary plane orthogonal to the stacking direction a. In this example, the substrate 10 has: a body 11; and an annular flange 12 protruding outwardly in a radial direction orthogonal to the stacking direction a from the outer peripheral surface 11a of the body 11. Figure 3 and Figure 4 As can be seen, the body 11 is formed in a circular shape when viewed from above. The flange 12 is formed in an annular shape when viewed from above. The substrate 10 is integrally formed of a resin material, for example. The resin material includes, but is not limited to, general-purpose plastics (polypropylene (PP), etc.), general-purpose engineering plastics (polycarbonate (PC), etc.) or super engineering plastics (e.g., polyphenylene sulfide (PPS), etc.).

[0025] The substrate 10 defines a first surface 13 and a second back surface 14 that are opposite to each other. In this example, the surface 13 and the back surface 14 are defined along an imaginary plane orthogonal to the lamination direction a. The substrate 10 has a through hole 15 extending from the surface 13 to the back surface 14 in the lamination direction a. The through hole 15 is formed, for example, circular in plan view. The through hole 15 is formed by a large-diameter portion 15a, for example, opening on the surface 13 side, and a small-diameter portion 15b, for example, opening on the back surface side. The diameter of the small-diameter portion 15b is smaller than the diameter of the large-diameter portion 15a. Within the through hole 15, a stepped surface 15c is formed based on the diameter difference between the large-diameter portion 15a and the small-diameter portion 15b.

[0026] The stepped surface 15c extends in a ring shape, for example, along an imaginary plane orthogonal to the stacking direction a. The battery cell 2 includes a membrane bonding body 20 supported on the stepped surface 15c. The membrane bonding body 20 is, for example, circular in plan view. An annular member 16 is disposed in the large-diameter portion 15a. The annular member 16 holds the edge of the outer peripheral side of the membrane bonding body 20 between itself and the stepped surface 15c. Thus, the membrane bonding body 20 divides the through-hole 15 into a first space 17 on the surface 13 side and a second space 18 on the back surface 14 side. The annular member 16 is, for example, formed of the same resin material as the substrate 10. In this example, the diameter of the inner peripheral surface of the annular member 16 is set to be approximately equal to the diameter of the small-diameter portion 15b.

[0027] The membrane assembly 20 includes: an electrolyte membrane 21; and catalyst layers 22 and 23 formed on the front and back sides of the electrolyte membrane 21, respectively. The electrolyte membrane 21 is, for example, an ion exchange membrane, specifically an anion exchange membrane (AEM). The catalyst layers 22 and 23 are formed of metallic materials such as platinum or an alloy of platinum and other metals. Gas diffusion layers (GDLs) 24 and 25 are formed on the respective surfaces of the catalyst layers 22 and 23. The gas diffusion layers 24 and 25 are, for example, porous transport layers (PTLs). Materials forming the gas diffusion layers 24 and 25 include, for example, carbon cloth or carbon paper.

[0028] like Figure 1 and Figure 2 It is evident that an annular recess, namely a groove 15d, is formed on the stepped surface 15c. A gasket 19 is disposed in this groove 15d. The gasket 19 is, for example, an O-ring. By pressing the annular member 16 against the stepped surface 15c, the gasket 19 is pressed into the groove 15d and flattened. As a result, the gasket 19 seals the space between the first space 17 and the second space 18. The gasket 19 is formed of an elastic material. Elastic materials include, for example, fluororubber (FKM), ethylene propylene diene monomer (EPDM), and silicone rubber (VMQ).

[0029] A flow path component 26 is disposed in the first space 17, and a flow path component 27 is disposed in the second space 18. The flow path components 26 and 27, when viewed from above, are formed, for example, of a circular metal material. The metal material includes, for example, stainless steel, aluminum, etc. Specifically, the flow path components 26 and 27 are mesh-like metal plates or the like. The flow path components 26 and 27 allow fluid to flow in the first space 17 and the second space 18, respectively.

[0030] The substrate 10 is held between a pair of flat partitions 30 and 31. A flow path component 26 is held between the gas diffusion layer 24 and the partitions 30. Thus, the flow path component 26 electrically connects the partitions 30 and the membrane assembly 20. Similarly, a flow path component 27 is held between the gas diffusion layer 25 and the partitions 31. Thus, the flow path component 27 electrically connects the partitions 31 and the membrane assembly 20.

[0031] Separator 30 contacts the surface 13 of substrate 10. Separator 31 contacts the back side 14 of substrate 10. The substrate 10 is secured in the lamination direction a by the aforementioned pair of end plates. Separators 30 and 31 are formed of, for example, a metallic material. Examples of metallic materials include stainless steel and titanium. Additionally, for example, separator 30 may also serve as separator 31 for another battery cell 2 laminated on the surface 13 side of substrate 10. Similarly, for example, separator 31 may also serve as separator 30 for another battery cell 2 laminated on the back side 14 side of substrate 10.

[0032] like Figure 1 and Figure 2 As shown, the battery cell 2 has an annular outer peripheral component 32 disposed around the outer peripheral surface 11a of the body 11 of the substrate 10. "Annular" in plan view includes circular (circle, ellipse, etc.) annularities without corners and polygonal (rectangle, pentagon, etc.) annularities with corners. The outer peripheral component 32 is formed, for example, from an annular metallic material in plan view. The metallic material includes, for example, stainless steel, aluminum, etc. In this example, the outer peripheral component 32 is formed in a cylindrical shape around its central axis. The cross-section of the outer peripheral component 32, defined along a section including the central axis, is, for example, defined as a quadrilateral. The outer peripheral component 32 fits into the outer peripheral surface 11a of the body 11. Furthermore, the outer peripheral component 32 is supported on the flange portion 12 of the substrate 10 in the lamination direction a. Moreover, the flange portion 12 of the substrate 10 is supported by a separator 31. That is, the flange portion 12 is sandwiched between the outer peripheral component 32 and the separator 31.

[0033] In one example, the outer diameter defined by the outer peripheral surface 32a of the outer peripheral member 32 is smaller than the outer diameter defined by the outer peripheral surface 12a of the flange portion 12. Furthermore, in another example, the outer diameter defined by the outer peripheral surfaces 30a and 31a of the partitions 30 and 31 is larger than the outer diameter defined by the outer peripheral surface 12a of the flange portion 12. On the other hand, the thickness T1 of the outer peripheral member 32 defined in the lamination direction a is set to be smaller than the thickness T2 of the body 11 of the substrate 10, which is also defined in the lamination direction a. Furthermore, in the lamination direction a, contact between the outer peripheral member 32 and the partitions 30 and 31 is avoided. That is, gaps are formed between the outer peripheral member 32 and the partition 30, and between the outer peripheral member 32 and the partition 31. As described above, the flange portion 12 is disposed between the outer peripheral member 32 and the partition 31. In addition, the inner peripheral surface of the outer peripheral component 32 may contact the outer peripheral surface 11a of the body 11 of the substrate 10, or a gap may be formed between it and the outer peripheral surface 11a.

[0034] In battery cell 2, an electrolyte membrane 21 forms a separator, a first space 17 is the anode (oxygen electrode) side, and a second space 18 is the cathode (hydrogen electrode) side. Specifically, a catalyst layer 22 disposed in the first space 17 constitutes the anode electrode, and a catalyst layer 23 disposed in the second space 18 constitutes the cathode electrode. Battery cell 2 includes: a flow path 40 for introducing electrolyte (first fluid) into the first space 17; a flow path 41 for discharging electrolyte and oxygen from the first space 17; and a flow path 42 for discharging hydrogen from the second space 18.

[0035] The flow path 40 includes: a manifold 40a extending through the substrate 10, the partition 30, and the partition 31 in the lamination direction a; and a recess 40b formed on the surface 13 of the substrate 10 and the surface of the annular member 16 continuous with the surface 13. In this example, the manifold 40a is formed at a position adjacent to one side of the first space 17 in a radial direction orthogonal to the lamination direction a. The recess 40b connects the manifold 40a and the first space 17. The recess 40b is covered by the partition 30. Furthermore, in this example, as... Figure 3 It is known that the recess 40b is formed by a groove connecting the manifold 40a and the first space 17, but as an alternative example, it can also be formed by multiple grooves.

[0036] The flow path 41 includes: a manifold 41a that passes through the substrate 10, the partition 30, and the partition 31 in the lamination direction a; and a recess 41b formed on the surface 13 of the substrate 10. In this example, the manifold 41a is formed at a position adjacent to the side opposite to the side of the first space 17 where the manifold 40a is formed in the radial direction. The recess 41b connects the first space 17 and the manifold 41a. The recess 41b is covered by the partition 30. Furthermore, in this example, as... Figure 3 It is known that the recess 41b is formed by a groove connecting the first space 17 and the manifold 40a, but as an alternative example, it can also be formed by multiple grooves.

[0037] The flow path 42 includes: a pair of manifolds 42a, 42a that penetrate the substrate 10, the partition 30, and the partition 31 in the lamination direction a; and a recess 42b formed on the inner circumferential surface of the back surface 14 of the substrate 10 and the small-diameter portion 15b of the through hole 15. In this example, the pair of manifolds 42a, 42a are formed in a radial direction, adjacent to the second space 18 on both sides. One recess 42b connects one manifold 42a to the second space 18, and the other recess 42b connects the other manifold 42a to the second space 18. Furthermore, in this example, as... Figure 4 It is known that the recess 42b is formed by a groove connecting the second space 18 and the manifold 42a, but as an alternative example, it can also be formed by multiple grooves.

[0038] like Figure 3 and Figure 4 As shown, the manifolds 40a and 41a of flow paths 40 and 41 are positioned radially opposite each other, separated by the first space 17 and the second space 18, while the manifolds 42a and 42a of flow path 42 are positioned radially opposite each other, separated by the first space 17 and the second space 18. Furthermore, in this example, manifolds 40a and 41a and manifolds 42a and 42a are arranged at a 90-degree angle around the center point of the substrate 10 when viewed from above. However, manifolds 40a and 41a and manifolds 42a and 42a can also be arranged relative to each other based on other angular intervals when viewed from above.

[0039] A gasket 50 is disposed on the surface 13 of the substrate 10, surrounding the first space 17, flow paths 40, 41, and 42 from the outside. In this example, the gasket 50 is generally circular when viewed from above. The gasket 50 extends along the edge of the outer periphery of the substrate 10. The gasket 50 is formed, for example, of the same material as the gasket 19. The gasket 50 is at least partially disposed within an annular recess, i.e., a groove 10a, formed on the surface 13. That is, the groove 10a has a depth sufficient to accommodate at least a portion of the gasket 50 before elastic deformation. On the surface 13 of the substrate 10, the gasket 50 is pressed into the groove 10a by the partition 30 and flattened. In this way, the gasket 50 seals the first space 17, flow paths 40, 41, and 42.

[0040] Similarly, gaskets 51, 51 are disposed on the surface 13 of the substrate 10, respectively surrounding the flow path 42, i.e., a pair of manifolds 42a, 42a. Gaskets 51, 51 are disposed inside the gasket 50. In this example, the gasket 51 is circular when viewed from above. The gasket 51 is formed, for example, of the same material as the gaskets 19, 50. The gaskets 51 are at least partially disposed within an annular recess, i.e., a groove 10b, formed on the surface 13. That is, the groove 10b has a depth sufficient to accommodate at least a portion of the gasket 51 before elastic deformation. On the surface 13 of the substrate 10, the gasket 51 is pressed flat into the groove 10b by the partition 30. Thus, the gasket 51 seals the flow path 42.

[0041] On the other hand, a gasket 52 is disposed on the back surface 14 of the substrate 10, surrounding the second space 18, flow path 42, and flow paths 40 and 41 from the outside. In this example, the gasket 52 is formed as a generally circular shape when viewed from above. The gasket 52 extends along the edge of the outer periphery of the substrate 10. The gasket 52 is formed, for example, from the same material as the gaskets 19, 50, and 51. The gasket 52 is at least partially disposed within an annular recess, i.e., a groove 10c, formed on the back surface 14. That is, the groove 10c has a depth sufficient to accommodate at least a portion of the gasket 52 before elastic deformation. On the back surface 14 of the substrate 10, the gasket 52 is pressed into the groove 10c by the partition 31 and flattened. In this way, the gasket 52 seals the second space 18 and the flow path 42.

[0042] Similarly, gaskets 53 and 53, respectively surrounding flow paths 40, i.e., manifolds 40a and 41a, are disposed on the back surface 14 of the substrate 10. Gaskets 53 and 53 are disposed inside gasket 52. In this example, gasket 53 is formed as a circle when viewed from above. Gasket 53 is formed, for example, from the same material as gaskets 19, 50, 51, and 52. Gaskets 53 are at least partially disposed within an annular recess, i.e., a groove 10d, formed on the back surface 14. That is, the groove 10d has a depth sufficient to accommodate at least a portion of the gasket 53 before elastic deformation. On the back surface 14 of the substrate 10, gasket 53 is pressed into the groove 10d by partition 31 and flattened. In this way, gasket 53 seals flow paths 40 and 41.

[0043] Next, the usage configuration of the water electrolysis device 1 will be described below. In the water electrolysis device 1, electrolyte is supplied to the first space 17 of each battery cell 2 via flow path 40. The electrolyte is, for example, an alkaline solution with a pH of 14 or lower. At this time, when a direct current is supplied to the current collector, a water electrolysis reaction occurs in each battery cell 2. Oxygen is generated on the anode side, i.e., the first space 17, and hydrogen is generated on the cathode side, i.e., the second space 18. Specifically, water in the electrolyte diffuses through the electrolyte membrane 21 and moves to the cathode side, where hydrogen (H2) and hydroxide ions (OH-) are generated from the water. - ): (H2O→H2+2OH) - On the other hand, hydroxide ions move towards the anode side in electrolyte membrane 21. As a result, on the anode side, water (H2O) and oxygen (O2) are generated from hydroxide ions: (2OH-) - →1 / 2O2 + H2O + 2e - Hydrogen generated on the cathode side is discharged from cell 2 via flow path 42. On the other hand, oxygen and water generated on the anode side are discharged from cell 2 via flow path 41.

[0044] In the water electrolysis apparatus 1 described above, as mentioned above, the battery stack formed by stacking multiple battery cells 2 is fastened with a large clamping force by a pair of end plates (not shown). Each battery cell 2 is subjected to a relatively large load in the stacking direction a. On the other hand, an annular outer peripheral member 32 is disposed around the outer peripheral surface 11a of the body 11 of the substrate 10. During operation of the water electrolysis apparatus 1, hydrogen is generated in the second space 18. When the hydrogen pressure is set to a high pressure to improve generation efficiency, the hydrogen pressure acts radially on the body 11 of the substrate 10 within the second space 18. The annular outer peripheral member 32 supports the body 11 from the outer peripheral side. As a result, the outer peripheral member 32 can suppress radial deformation of the body 11 caused by the radial pressure induced by hydrogen. Therefore, the strength of the battery cell 2 is improved.

[0045] Figure 5 correspond Figure 1 This is a cross-sectional view that schematically represents the structure of battery cell 2A in a modified example. For example... Figure 5 As shown, the battery cell 2A replaces the aforementioned peripheral component 32, and is assembled with the peripheral component 32A. The peripheral component 32A has: an annular inner peripheral portion 33 disposed around the outer peripheral surface 11a of the body 11 of the substrate 10; and an annular outer peripheral portion 34 protruding from the outer peripheral surface 33a of the inner peripheral portion 33 towards the outer peripheral side. In this example, the inner peripheral portion 33 is formed in a cylindrical shape around its central axis. The outer peripheral portion 34 is formed in a disk shape around its central axis. In this example, the outer peripheral portion 34 is integrally formed at one end of the inner peripheral portion 33 in the lamination direction a. That is, in a cross-section including the central axis, the outer peripheral component 32A is formed in an L-shape. The outer peripheral portion 34 is supported on the flange portion 12 of the substrate 10. With such a peripheral component 32A, the strength of the battery cell 2 can be improved.

[0046] In the water electrolysis device 1 described above, gaskets 50 to 53 are disposed within grooves 10a to 10d formed on the surface 13 or back surface 14 of the substrate 10, but the formation of any one or all of the grooves 10a to 10d may be omitted. That is, gaskets 50 to 53 may also be bonded to the surface 13 or back surface 14 of the substrate 10, for example. Furthermore, the substrate 10 and membrane bonding body 20 of each battery cell 2 are formed into a circle when viewed from above, but may also be formed into a rectangle or other polygons when viewed from above. Regarding the dimensions related to the water electrolysis device 1, the substrate 10 may, for example, have a diameter of approximately 300 mm to 1000 mm. Additionally, in the lamination direction a, each battery cell 2 may, for example, have a thickness of approximately 1 mm to 5 mm.

[0047] Furthermore, while each battery cell 2 of the water electrolysis device 1 uses an anion exchange membrane (AEM) as the electrolyte membrane 21, it can also be replaced by a solid polymer electrolyte membrane such as a proton exchange membrane (PEM). In this case, pure water is supplied to the anode side in each battery cell 2. Moreover, in the above embodiment, the battery cell 2 is assembled in the water electrolysis device 1, but it can also be assembled in a fuel cell.

[0048] The present invention has been described above through the above embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. As will be understood from the claims, forms with such modifications or improvements can also be included within the technical scope of the present invention.

[0049] The embodiments described above are for ease of understanding of the present invention and are not intended to limit the scope of the invention. Furthermore, the above embodiments do not limit the application of the present invention; all objects to which the present invention can be utilized can be included in its application. The constituent elements, their configurations, materials, conditions, shapes, dimensions, etc., included in the above embodiments are not limited to the illustrated contents and can be appropriately modified. For example, the present invention also includes differences arising during implementation due to manufacturing tolerances, etc. Furthermore, to the extent that there is no technical contradiction, the constituent elements shown in different embodiments can be partially substituted or combined with each other. In addition, the constituent elements can be appropriately and selectively combined to achieve at least a portion of the aforementioned problems and effects.

[0050] Symbol Explanation 1 Water electrolysis device, 2 Battery cell, 10 Substrate, 10a, 10b, 10c, 10d Groove, 11 Body, 11a Outer peripheral surface, 12 Flange, 13 Surface (first surface), 14 Back surface (second surface), 15 Through hole (hole), 15a Large diameter portion, 15b Small diameter portion, 15c Stepped surface, 15d Groove, 16 Annular component, 17 First space, 18 Second space, 19 Gasket, 20 Membrane junction, 21 Electrolyte membrane, 22, 23 Catalyst layer, 24, 25 Gas diffusion layer, 26, 27 Flow path component, 30, 31 Separator, 30a, 31a Outer peripheral surface, 32, 32A Outer peripheral component, 32a Outer peripheral surface, 33 Inner peripheral portion, 34 Outer peripheral portion, 40 Flow path, 40a Manifold, 40b Recess, 41 Flow path, 41a Manifold, 41b Recess, 42 Flow path, 42a Manifold, 42b Recess, 50 Gasket, 51 Gasket, 52 Gasket, 53 Gasket, a Stacking direction

Claims

1. A battery cell, comprising: Define the first and second sides of the substrate that are opposite to each other; A hole extending through the substrate from the first surface to the second surface; A membrane disposed within the aperture, dividing the aperture into a first space on the first side and a second space on the second side; and An annular peripheral component disposed around the outer peripheral surface of the substrate.

2. The battery cell according to claim 1, wherein, The substrate has: a body having the hole; and a flange portion that protrudes from the outer peripheral surface of the body to the outer peripheral side and supports the outer peripheral component.

3. The battery cell according to claim 1, wherein, The thickness of the substrate, defined in a direction orthogonal to the first surface, is greater than the thickness of the outer peripheral component, defined in that direction.

4. The battery cell according to claim 1, wherein, The outer peripheral component has: an inner peripheral portion extending around the outer peripheral surface of the substrate; and an outer peripheral portion protruding from the inner peripheral portion toward the outer peripheral side.

5. The battery cell according to claim 1, wherein, The substrate is formed of a resin material.

6. The battery cell according to claim 5, wherein, The outer peripheral components are made of metallic material.

7. The battery cell according to claim 1, wherein, It also includes conductive flow path components configured in the first space and the second space.

8. The battery cell according to claim 7, wherein, It also includes a partition disposed on the second side and in contact with the flow path component.

9. The battery cell according to claim 1, wherein, The membrane is an electrolyte membrane assembled into a water electrolysis device or fuel cell.

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