High-pressure tank, vehicle with a high-pressure tank and method for producing a high-pressure tank

Abstract

High-pressure tank (10B; 10C; 10E), comprising: a liner (20) having an interior space (22) for storing a fluid; a fiber layer (23) with Fibers (24) wound around an outer surface of the lining (20), and a thermosetting resin (25) that has been cured and covers the surfaces of the fibers (24); and a protective layer (27A; 27B; 27C; 27Ea, 27Eb) comprising a porous member (30) disposed on the fibers (24), wherein the porous member (30) has a plurality of pores (31) extending through the porous member (30) in a thickness direction of the porous member (30), wherein the thermosetting resin (25) has penetrated into the pores (31), wherein the porous element (30) comprises a sheet-like grid element (30B; 30C; 30D; 30E) comprising a grid defining the pores (31) and configured to expand or contract by deformation of the grid, characterized in that the pores (31) have a rhomboid shape

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

[0001] The present invention relates to a high-pressure tank, a vehicle having the high-pressure tank and a method for manufacturing the high-pressure tank. 2. Description of the state of the art

[0002] There is a high-pressure tank comprising a fiber layer made of fibers wrapped around the surface of a liner and a thermosetting resin that is thermally cured. For example, Japanese Patent Application JP 2018-100768 A discloses a high-pressure tank comprising a reinforcement layer formed from the fiber layer and a protective layer made of glass fiber reinforced plastic formed on the reinforcement layer. With the glass fiber reinforced plastic, the protective layer can be formed to have high impact resistance. This can increase the durability of the high-pressure tank. With the protective layer made of glass fiber reinforced plastic, deterioration of the high-pressure tank, for example, due to discoloration due to damage, can be easily checked visually.In this way, it is possible to appropriately determine the time of replacement, which is necessary due to the deterioration of the high-pressure tank. A high-pressure tank and a method for its production according to the preamble of the independent claims are known from US 2010 / 0 276 434 A1. Further prior art can be found in US 2015 / 0 292 677 A1, DE 603 ​​16 846 T2, DE 10 2015 222 392 A1, and US 2004 / 0 242 095 A1. SUMMARY OF THE INVENTION

[0003] When the protective layer protecting the fiber layer of the high-pressure tank is made of glass fiber reinforced plastic as described above, a method of winding the fibers serving as the fiber layer and then winding the glass fibers impregnated with the thermosetting resin is generally adopted. Therefore, the manufacturing process of the high-pressure tank may be complicated, or the manufacturing cost may increase. For the high-pressure tank, it is desirable that the protective layer that facilitates deterioration control of the high-pressure tank be formed more simply while enhancing the protective effect of the fiber layer.

[0004] These objectives are achieved from a device-related perspective with the high-pressure tank of claims 1 and 2, and from a process-related perspective with the method for producing a high-pressure tank of claims 8 and 9. A further aspect is a vehicle comprising the high-pressure tank according to the invention. Advantageous embodiments are the subject of the dependent claims.

[0005] The technology disclosed here can be implemented in the following aspects.

[0006] A first aspect of the present invention relates to a high-pressure tank. The high-pressure tank comprises a liner, a fiber layer, and a protective layer. The liner has an interior space for storing a fluid. The fiber layer includes fibers wound around an outer surface of the liner and a thermosetting resin that has been cured and covers the surfaces of the fibers. The protective layer includes a porous member disposed on the fibers, the porous member having a plurality of pores extending through the porous member in a thickness direction of the porous member. The thermosetting resin has penetrated into the pores.

[0007] According to the first aspect, the protective layer can be formed on the fiber layer with a simple structure in which the protective layer is integrated with the fiber layer by penetrating the thermosetting resin of the fiber layer into the pores using the porous member. This can increase the durability of the fiber layer. This protective layer can be formed by disposing the porous member on the fibers. Therefore, the protective layer can be formed more easily than a protective layer formed by winding a glass fiber impregnated with the thermosetting resin.

[0008] In the first aspect, the porous member may comprise a tubular mesh member having a mesh defining the pores and surrounding an outer perimeter of the liner.

[0009] In the aspect described above, the tubular mesh member may have an elongation property in which a restoring force is generated when the tubular mesh member is elongated.

[0010] According to the structure described above, since the tubular mesh member has the stretching property, the protective layer can follow the expansion and contraction of the high-pressure tank. This makes it possible to suppress deterioration of the protective layer due to repeated expansion and contraction of the high-pressure tank. In the process of manufacturing the high-pressure tank, the tubular mesh member is fixed to the outer periphery of the liner in an expanded state in which the restoring force is generated. Therefore, the tubular mesh member can be brought into close contact with the fibers of the fiber layer by the restoring force. In this way, the degree of close contact between the fiber layer and the protective layer can be increased, and the separation of the fiber layer and the protective layer can be suppressed. Furthermore, the tubular mesh member can be easily arranged in the process of manufacturing the high-pressure tank.This reduces the manufacturing costs of the high-pressure tank.

[0011] In the aspect described above, the porous member may comprise a sheet-like mesh member comprising a mesh defining the pores and configured to expand or contract by deformation of the mesh.

[0012] According to the structure described above, the protective layer includes the sheet-like mesh member, which retains its shape as a sheet metal shape. Therefore, the strength of the protective layer is increased. Due to the deformation of the mesh, the sheet-like mesh member is expandable or contractible. Therefore, the protective layer can follow the expansion and contraction of the high-pressure tank. This makes it possible to suppress deterioration of the protective layer due to repeated expansion and contraction of the high-pressure tank. In addition, the sheet-like mesh member is arranged in a desired area of ​​the high-pressure tank. Therefore, the protective layer can be formed in that area. This structure ensures efficiency because the protective layer can be easily formed only in an area that needs protection.

[0013] In the above-described aspect, the protective layer may include a first protective layer and a second protective layer arranged at positions where the first protective layer and the second protective layer oppose each other across a central axis of the high-pressure tank. According to the above-described structure, the protective layers may be formed on the respective sides of the central axis. This can enhance the protective effect of the high-pressure tank.

[0014] In the above-described aspect, the sheet-like mesh member may be formed at one end of the sheet-like mesh member with a fastening member that extends outward from a surface of the high-pressure tank and can be connected to a bracket configured to support the high-pressure tank. According to the above-described structure, the high-pressure tank can be easily fixed by the fastening member integrally formed with the porous member of the protective layer.

[0015] In the aspect described above, the sheet-like grid element may comprise a plurality of threads and a plurality of connectors each connecting the ends of the threads. The threads and the connectors may define the pores.

[0016] In the aspect described above, each of the pores may have a rhomboid shape.

[0017] In the aspect described above, each of the threads may be bent into a cranked shape.

[0018] In the aspect described above, each of the pores may have a shape corresponding to a shape in which ends of a plurality of ellipses arranged in series in a direction of the major diameter are connected to each other.

[0019] A second aspect of the present invention relates to a vehicle having the high-pressure tank according to the above-described aspect. The vehicle includes the bracket. The fastening means extends transversely across the center axis of the high-pressure tank on both sides. The high-pressure tank is supported by the bracket in a state in which buffer regions are formed above and below the high-pressure tank, in which the high-pressure tank can expand or contract.

[0020] According to the second aspect, the displacement of the high-pressure tank associated with the expansion and contraction of the high-pressure tank is suppressed. This structure reduces the occurrence of a case where devices such as a valve connected to the high-pressure tank or devices arranged around the high-pressure tank absorb forces caused by the expansion and contraction of the high-pressure tank.

[0021] A third aspect of the present invention relates to a method for manufacturing a high-pressure tank. The method for manufacturing the high-pressure tank includes: preparing a liner having an internal space for storing a fluid, preparing a porous member having a plurality of pores extending through the porous member in a thickness direction of the porous member, winding fibers impregnated with a thermosetting resin around a surface of the liner, disposing the porous member on the fibers, and thermally curing the thermosetting resin impregnated into the fibers by heating the liner with the porous member while the thermosetting resin flows into the pores of the porous member.

[0022] According to the third aspect, the protective layer integrated with the fiber layer by the thermosetting resin can be easily formed by disposing the porous member on the fibers.

[0023] The technology disclosed herein can be implemented in various aspects other than the high-pressure tank and its manufacturing method. For example, the technology disclosed herein can be implemented in various aspects, such as a fuel cell system including the high-pressure tank, a vehicle including the high-pressure tank, a method for forming the protective layer of the high-pressure tank, an apparatus for manufacturing the high-pressure tank, and a structure for protecting the high-pressure tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The features and advantages as well as the technical and economic significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which like reference numerals designate like elements, in which: Fig. 1 is a schematic side view showing a high-pressure tank of a first embodiment; Fig. 2 is a schematic sectional view of the high-pressure tank of the first embodiment; Fig. 3 is an explanatory diagram showing the flow of a method for manufacturing the high-pressure tank of the first embodiment; Fig. 4 is a schematic perspective view showing a fastening device configured to secure a tubular grid element to a liner; Fig. 5 is a schematic plan view of the fastening device in a state in which the tubular grid element is fastened; Fig. Figure 6 is a schematic plan view showing the fastening device when the tubular grid element is stretched; Fig. Fig. 7 is a schematic perspective view showing a step of inserting the liner into the tubular grid member; Fig. 8 is a schematic perspective view showing a state in which the fastening device completes fastening the tubular mesh member to the liner; Fig. 9 is a schematic perspective view showing states before and after the formation of a fiber layer and a protective layer in a thermal curing step; Fig. 10A is a schematic side view showing a high-pressure tank of a second embodiment; Fig. 10B is a schematic sectional view of the high-pressure tank of the second embodiment; Fig. 10C is a schematic sectional view of the high-pressure tank of the second embodiment; Fig. 11 is a schematic perspective view showing the sheet-like grid element of the second embodiment; Fig. 12 is a schematic perspective view showing an enlarged portion of the sheet-like grid member of the second embodiment; Fig. 13 is a schematic sectional view showing a holding member for use in a thermal curing step of the second embodiment; Fig. 14 is a schematic side view showing a high-pressure tank of a third embodiment; Fig. 15 is a schematic perspective view showing the structure of a sheet-shaped grid member of the third embodiment; Fig. 16 is a schematic side view showing a process for manufacturing the sheet-shaped grid member of the third embodiment; Fig. 17 is a schematic perspective view showing the structure of a sheet-shaped grid member of a fourth embodiment; Fig. 18 is a schematic side view showing a high-pressure tank of a fifth embodiment; Fig. 19 is a schematic side view showing the high-pressure tank of the fifth embodiment; Fig. 20 is a schematic sectional view of a fastening means attached to the high-pressure tank of the fifth embodiment; and Fig. 21 is a schematic diagram showing an example of the installation position of the high-pressure tank in a fuel cell vehicle. DETAILED DESCRIPTION OF EMBODIMENTSFirst Embodiment:

[0025] Fig. 1 is a schematic side view showing a high-pressure tank 10A of a first embodiment. In Fig. In FIG. 1, a center axis CX of the high-pressure tank 10A is shown by a dot-dash line. The high-pressure tank 10A is a hollow container that stores a fluid. In the first embodiment, the high-pressure tank 10A is mounted on a fuel cell vehicle and serves to store fuel gas to be supplied to a fuel cell. In the first embodiment, the high-pressure tank 10A is filled with high-pressure hydrogen as the fuel gas of the fuel cell. The high-pressure tank 10A has a pressure resistance of 70 MPa or higher.

[0026] The high-pressure tank 10A includes a cylinder 11 having a substantially cylindrical shape and caps 12a and 12b having a substantially hemispherical shape disposed at respective ends of the cylinder 11. Each of the caps 12a and 12b has an opening (not shown) at its apex. The opening communicates with an interior of the high-pressure tank 10A. The opening at the top of the first cap 12a is hermetically sealed by attaching a metal cap 13. A pipe through which the fluid stored in the high-pressure tank 10A flows is connected to the cap 13. The cap 13 is provided with an on / off valve (not shown) and a fusible plug valve (not shown). The on / off valve controls the flow of the stored fluid into or out of the high-pressure tank 10A.The fusible plug valve melts at a certain temperature or above to allow the fluid to escape from the high-pressure tank 10A. The opening at the apex of the second hood 12b is hermetically sealed by attaching a metallic plug 14.

[0027] Fig. 2 is a schematic sectional view of the high pressure tank 10A, cut along a line II-II in Fig. 1. The high-pressure tank 10A has a liner 20 inside. The liner 20 is a hollow container that serves as the body of the high-pressure tank 10A. The liner 20 has a wall 21 and an interior space 22. The wall 21 defines the cylinder 11 and the hoods 12a and 12b. The interior space 22 is enclosed by the wall 21 for storing the fluid. In the first embodiment, the liner 20 is made of a resin. The liner 20 is formed from a reinforced plastic, for example, by rotational molding. In other embodiments, the liner 20 may be made of a light metal such as an aluminum alloy instead of the resin.

[0028] A fiber layer 23 and a protective layer 27A are stacked on the surface of the wall 21 of the liner 20. The fiber layer 23 is formed by filament winding, using the liner 20 as a mandrel to cover the entire outer surface of the liner 20. The fiber layer 23 includes fibers 24 and a thermosetting resin 25. The fibers 24 are wound around the entire outer surface of the liner 20 to form a plurality of superimposed layers. The thermosetting resin 25 is thermally cured while covering the surfaces of the fibers 24 and bonding the fibers 24 together. In the first embodiment, the fiber layer 23 is made of carbon fiber reinforced plastic (CFRP). The fiber 24 is a carbon fiber, and the thermosetting resin 25 is an epoxy resin. The thermosetting resin 25 is not limited to the epoxy resin, but can also consist of other thermosetting resins, such asan unsaturated polyester resin.

[0029] The fiber layer 23 covers the cylinder 11 and the Fig. 1. In the hoods 12a and 12b, the cap 13 and the sealing plug 14 protrude from the fiber layer 23. Covers (not shown) extending outward from central pipe sections along the hoods 12a and 12b of the liner 20 are covered with the fiber layer 23 so that the cap 13 and the sealing plug 14 are attached to the liner 20.

[0030] As in Fig. 2, the protective layer 27A includes a porous member 30 disposed on the fibers 24 of the fiber layer 23, the porous member 30 having a plurality of pores 31 extending through the porous member 30 in its thickness direction. The plurality of pores 31 are disposed over the entire portion of the porous member 30. The porous member 30 is disposed over the entire protective layer 27A. In the first embodiment, the porous member 30 is a tubular mesh member 30A surrounding the liner 20 and having a mesh defining the pores 31. As shown in Fig. 1, the tubular mesh member 30A of the first embodiment covers at least the cylinder 11 and also covers the lower ends of the hoods 12a and 12b.

[0031] In other embodiments, the tubular mesh member 30A and the protective layer 27A may completely cover the cylinder 11 and the hoods 12a and 12b, or may partially cover the cylinder 11. Alternatively, the tubular mesh member 30A and the protective layer 27A may completely or partially cover the hoods 12a and 12b.

[0032] The tubular mesh member 30A has an elongation property in which a restoring force is generated when the tubular mesh member 30A is stretched. The tubular mesh member 30A is arranged in an elongated state and is attached to a surface layer of the fibers 24 with the restoring force. The tubular mesh member 30A has a heat resistance in which the tubular mesh member 30A is not melted in a thermal curing step described later. The tubular mesh member 30A is a fiber member made of a resin such as nylon with high heat resistance. Specifically, the tubular mesh member 30A is made of NETLON (registered trademark).

[0033] As in Fig. 2, the thermosetting resin 25 of the fiber layer 23 penetrates into the pores 31, so that the tubular mesh member 30A is integrated with the fiber layer 23. The thermosetting resin 25 covers the entire tubular mesh member 30A.

[0034] In order to protect the fiber layer 23 from a foreign matter such as a pebble that comes into contact with the high-pressure tank 10A during use in the fuel cell vehicle, the size of the pore 31 of the tubular mesh member 30A is desirably smaller than the size of the foreign matter. Specifically, the pore 31 of the tubular mesh member 30A may have a maximum width of approximately 0.1 to 10 mm.

[0035] Fig. 3 is an explanatory diagram showing the flow of a method for manufacturing the high-pressure tank 10A. In step P1, the liner 20 and the porous member 30 are prepared. The cap 13 and the plug 14 are attached to the openings of the hoods 12a and 12b of the liner 20. In step P2, the fibers 24 impregnated with an uncured thermosetting resin 25 are wound around the liner 20 into a spiral or hoop using a filament winder. In step P2, the wound layers of the fibers 24 covering the entire liner 20 are stacked. In step P3, the porous member 30 prepared in step P1 is arranged on the fibers 24. In the first embodiment, the tubular mesh member 30A as the porous member 30 is arranged on the fibers 24.

[0036] Details of step P3 will be described with reference to Fig. 4 to Fig. 8 described in order. Fig. 4 is a schematic perspective view showing a fastening device 100 configured to fasten the tubular mesh member 30A to the liner 20. The fastening device 100 includes a plurality of shafts 101 and a plate body 105 to which the shafts 101 are fastened in parallel. A plurality of grooves 106 are formed in a surface 105s of the plate body 105. The grooves 106 extend from the center to the outer periphery of the plate body 105 and are radially arranged at regular intervals to surround the center of the plate body 105. An end of each groove 106 closer to the center of the plate body 105 is hereinafter referred to as a "first end 106a." An end of each groove 106 located closer to the outer periphery of the plate body 105 is hereinafter referred to as “second end 106b”.

[0037] Each shaft 101 extends from the groove 106 in a direction perpendicular to the surface 105s of the plate body 105. The shaft 101 is linearly movable along the groove 106 between the first end 106a and the second end 106b of the groove 106. The shaft 101 is moved by a gear mechanism (not shown) disposed within the plate body 105.

[0038] In the fastening device 100, the shafts 101 serve as holders configured to hold the tubular mesh member 30A. The tubular mesh member 30A is attached to the fastening device 100 by inserting the shafts 101 into the tubular mesh member 30A in a state where the shafts 101 are located at the first ends 106a.

[0039] Fig. 5 is a schematic plan view of the fastening device 100 in a state in which the tubular grid element 30A is fastened. In Fig. 5, an outer peripheral boundary line of the liner 20 when the liner 20 is arranged so that the center axis of the liner 20 is aligned with a center axis of the plate body 105 is indicated by a chain line for reference. The diameter of an imaginary circle (not shown) connecting the first ends 106a of the grooves 106 of the plate body 105 is larger than the diameter of the tubular mesh member 30A shaped into a cylinder without stretching. The tubular mesh member 30A is wrapped around the shafts 101 while being stretched in the radial direction and is held by the shafts 101 in a state where a restoring force is generated.

[0040] Fig. 6 is a schematic plan view of the fastening device 100 when the attached tubular mesh member 30A is stretched by moving the shafts 101. The diameter of the imaginary circle (not shown) connecting the first ends 106a of the grooves 106 is smaller than the diameter of the liner 20. The diameter of an imaginary circle (not shown) connecting the second ends 106b of the grooves 106 is larger than the diameter of the liner 20. After the tubular mesh member 30A is attached, the shafts 101 are moved to the second ends 106b to stretch the tubular mesh member 30A. Therefore, the diameter of the tubular mesh member 30A is increased. In this way, a space for receiving the liner 20 can be formed in the tubular mesh member 30A.

[0041] Fig. Fig. 7 is a schematic perspective view showing a step of inserting the liner 20 into the tubular mesh member 30A held by the shafts 101 of the fastening device 100. The liner 20 with the fibers 24 wound in step P2 is inserted along the central axis of the plate body 105 of the fastening device 100 into the tubular mesh member 30A, the diameter of which is enlarged by the fastening device 100, as shown in Fig. 6 shown.

[0042] Fig. 8 is a schematic perspective view showing a state in which the fastening device 100 completes the fastening of the tubular mesh member 30A to the liner 20. After the liner 20 is inserted into the tubular mesh member 30A, the tubular mesh member 30A is fastened to the liner 20 by applying an external force between the shafts 101 to the end of the tubular mesh member 30A opposite the plate body 105, so that the tubular mesh member 30A is not separated from the fibers 24 of the liner 20. In this state, the liner 20 is moved away from the plate body 105 in a direction along the central axis CX to remove the shafts 101 from the space between the tubular mesh member 30A and the liner 20.Then, the tubular mesh element 30A contracts with its restoring force and is pulled onto the fibers 24 wound around the liner 20. A groove may be provided in the side surface of each shaft 101 to improve the slippage of the tubular mesh element 30A, so that the shaft 101 can be easily removed from the tubular mesh element 30A.

[0043] After the tubular grid element 30A is attached to the liner 20, step P4 of Fig. 3. Step P4 is a step of thermally curing the thermosetting resin 25. In step P4, the liner 20 with the tubular mesh member 30A is placed in a heating furnace and heated to a temperature equal to or higher than the curing temperature of the thermosetting resin 25. In this way, the thermosetting resin impregnated into the fibers 24 is thermally cured. In step P4, the liner 20 is heated while rotating to reduce the positional imbalance of the thermosetting resin 25 due to the flow of the molten thermosetting resin 25.

[0044] Fig. 9 is a schematic diagram showing the states before and after the formation of the fiber layer 23 and the protective layer 27A in the thermal curing step (step P4). When the liner 20 including the fibers 24 and the tubular mesh member 30A is heated in the heating furnace in step P4, the thermosetting resin 25 impregnated in the fibers 24 melts and flows to fill the spaces between the fibers 24 and penetrate into the pores 31 of the tubular mesh member 30A. The thermosetting resin 25 continues to flow to cover the entire tubular mesh member 30A. Then, the thermosetting resin 25 is thermally cured to form the fiber layer 23 and the protective layer 27A, which are integrated by the thermosetting resin 25. In other words, the thermosetting resin impregnating the fibers 24 and the thermosetting resin integrating the protective layer 27A are homogeneous.

[0045] According to the high-pressure tank 10A of the first embodiment described above, the tubular mesh member 30A is fixed to the liner 20 before the thermal curing step. Therefore, the protective layer 27A protecting the fiber layer 23 can be easily formed. According to the high-pressure tank 10A of the first embodiment, the protective layer 27A, whose strength is increased by coating the tubular mesh member 30A with the thermosetting resin 25, is formed on the surface layer. This increases the durability of the high-pressure tank 10A. According to the high-pressure tank 10A of the first embodiment, the thermosetting resin 25 penetrates into the pores 31 of the tubular mesh member 30A, so that the fiber layer 23 and the protective layer 27A are integrated. This suppresses deterioration of the high-pressure tank 10A due to peeling of the fiber layer 23 and the protective layer 27A.With the protective layer 27A including the tubular mesh member 30A, it is easy to visually check whether any fiber of the mesh of the tubular mesh member 30A is broken. Therefore, the degree of deterioration of the protective layer 27A can be visually checked based on how the fibers of the tubular mesh member 30A are broken. In this way, it is possible to easily and appropriately determine the replacement timing required due to the deterioration of the high-pressure tank 10A.

[0046] According to the high-pressure tank 10A of the first embodiment, the tubular mesh member 30A of the protective layer 27A has the elongation property. When the high-pressure tank 10A repeatedly expands and contracts due to repeated loading and unloading of the stored fluid, the tubular mesh member 30A can expand and contract to follow the expansion and contraction. This elongation property suppresses the deterioration of the protective layer 27A due to the repeated expansion and contraction of the high-pressure tank 10A. The expandable tubular mesh member 30A suppresses the restriction of the expansion of the high-pressure tank 10A by the protective layer 27A. Therefore, the generation of residual stress upon expansion of the high-pressure tank 10A and thus the deterioration of the high-pressure tank 10A is suppressed.In the first embodiment, the tubular mesh member 30A is contractible with the restoring force generated when the tubular mesh member 30A is stretched. This increases the followability of the protective layer 27A during the contraction of the high-pressure tank 10A. Furthermore, the tubular mesh member 30A, which has the stretching property, can be easily attached to the liner 20. Therefore, the protective layer 27A can be formed in a shorter time. By attaching the tubular mesh member 30A to the liner 20 in a state where the restoring force is generated, the tubular mesh member 30A can be adapted to irregularities in the wound layers of the fibers 24 formed on the surface layer of the liner 20.Therefore, wrinkling of the tubular mesh member 30A is suppressed, and generation of a gap between the tubular mesh member 30A and the fiber 24 is suppressed. Thus, it is possible to suppress deterioration of the appearance of the high-pressure tank 10A due to wrinkling of the tubular mesh member 30A, and to suppress reduction in the durability of the protective layer 27A due to the gap generated between the tubular mesh member 30A and the fiber 24. Second embodiment:

[0047] Fig. 10A is a schematic side view showing a high-pressure tank 10B of a second embodiment. Fig. 10B is a schematic sectional view of the high pressure tank 10B, cut along a line XB-XB in Fig. 10A. Fig. Figure 10C is a schematic sectional view of the high pressure tank 10B, cut along a line XC-XC in Fig. 10B. The structure of the high-pressure tank 10B of the second embodiment is substantially the same as that of the high-pressure tank 10A of the first embodiment, except that a protective layer 27B of the second embodiment is provided instead of the protective layer 27A described in the first embodiment.

[0048] As in Fig. 10A and Fig. 10B, the protective layer 27B of the second embodiment covers a part of the side surface of the cylinder 11 in a region between the hoods 12a and 12b at the respective ends. The high-pressure tank 10B is mounted on the fuel cell vehicle in a posture in which the protective layer 27B is located on a lower side. As shown in Fig. 10B, the protective layer 27B of the second embodiment covers the cylinder 11 in its circumferential direction in a range of about 1 / 3 to 1 / 2 of the circumference of the cylinder 11. As shown in Fig. As shown in Figure 10C, the protective layer 27B includes the porous member 30 having pores 31 extending through the porous member 30 in its thickness direction. The pores 31 are arranged over the entire portion of the porous member 30. In the second embodiment, the porous member 30 is formed from the sheet-like mesh members 30B described below. The sheet-like mesh members 30B are arranged over the entire protective layer 27B.

[0049] The structure of each sheet-shaped grid element 30B of the protective layer 27B is also described with reference to Fig. 11 and Fig. 12 described. Fig. 11 is a schematic perspective view showing the sheet-shaped grid elements 30B. Fig. 12 is a schematic perspective view showing a part of the sheet-shaped grid member 30B in an enlarged manner.

[0050] It will be Fig. 11. In the second embodiment, the protective layer 27B includes a plurality of sheet-shaped mesh elements 30B as the porous element 30. Each sheet-shaped mesh element 30B has a curved shape corresponding to the side surface of the cylinder 11, and a mesh is formed over the entire sheet-shaped mesh element 30B, defining the pores 31. The sheet-shaped mesh element 30B has a shape-retaining property to maintain the curved sheet shape. As shown in Fig. As shown in FIG. 10A, the sheet-like mesh members 30B are arranged in a row on the side surface of the cylinder 11 along a center axis CX of the high-pressure tank 10B. The reason why the protective layer 27B is formed by using the plurality of sheet-like mesh members 30B will be described later.

[0051] It will be Fig. 12. In the second embodiment, the sheet-shaped mesh member 30B is expandable or contractible by deformation of the mesh. For example, the sheet-shaped mesh member 30B is made of expanded metal. The pores 31 of the sheet-shaped mesh member 30B are formed such that a plurality of small slits arranged in a staggered pattern in a metal sheet serving as a base for the sheet-shaped mesh member 30B are opened by pushing out the two side portions of each slit to opposite sides along a thickness direction of the metal sheet. Fig. 12, the areas that were previously the inner wall surfaces of the slots are hatched. In the second embodiment, each pore 31 is opened in a rhomboid shape, as shown in Fig. 12 shown.

[0052] The sheet-like mesh element 30B includes a plurality of threads 33 and a plurality of connectors 34, each connecting the ends of four threads 33. In the second embodiment, the threads 33 are straight sections of the same length, serving as four sides of each rhombic pore 31. The connectors 34 serve as corners of each rhombic pore 31.

[0053] The sheet-like mesh member 30B is expanded or compressed by changing the dimensional ratios of the rhombic pores 31 in a width direction X and a longitudinal direction Y. The "width direction X" is a circumferential direction of the high-pressure tank 10B when the sheet-like mesh member 30B is disposed on the high-pressure tank 10B. The "longitudinal direction Y" is a direction along the central axis CX of the high-pressure tank 10B.

[0054] When the sheet-like mesh member 30B is stretched in the width direction X, the opening widths of the pores 31 in the width direction X increase, and the opening widths of the pores 31 in the longitudinal direction Y decrease. When the sheet-like mesh member 30B is contracted in the width direction X, the opening widths of the pores 31 in the width direction X decrease, and the opening widths of the pores 31 in the longitudinal direction Y increase. Since the sheet-like mesh member 30B has the stretching property, the protective layer 27B can stretch and contract to follow the expansion and contraction of the high-pressure tank 10B.

[0055] In the second embodiment, the plurality of sheet-like mesh members 30B are arranged in the direction along the central axis CX of the high-pressure tank 10B as described above. This allows the dimension of each sheet-like mesh member 30B in the longitudinal direction Y along the central axis CX of the high-pressure tank 10B to be reduced. Due to the small dimension of each sheet-like mesh member 30B in the longitudinal direction Y, the sheet-like mesh member 30B can easily contract in the longitudinal direction Y when the high-pressure tank 10B expands and the sheet-like mesh member 30B stretches in the width direction X. This makes it possible to reduce the stress in the protective layer 27B when the high-pressure tank 10B expands, thereby suppressing deterioration of the protective layer 27B due to repeated expansion and contraction of the high-pressure tank 10B.

[0056] The structure of a holding member 200 for use in a thermal curing step in a method of manufacturing the high-pressure tank 10B of the second embodiment will be described with reference to Fig. 13 described. Fig. 13 is a schematic sectional view taken in a section plane orthogonal to a central axis of the holding member 200 that holds the liner 20 of the high-pressure tank 10B.

[0057] The high pressure tank 10B of the second embodiment is manufactured similarly to the high pressure tank 10A described in the first embodiment by the flow of the manufacturing method of Fig. 3. In step P3 of the second embodiment, the sheet-like mesh elements 30B serving as the porous member 30B are arranged on the fibers 24 wound around the liner 20. In the thermal curing step (step P4), the thermosetting resin 25 penetrates into the pores 31 of the sheet-like mesh element 30B and is thermally cured to form the protective layer 27B. In the thermal curing step, the holding member 200 is used to suppress the peeling of the sheet-like mesh elements 30B from the liner 20 before the thermosetting resin 25 is thermally cured. The holding member 200 holds the liner 20 and the sheet-like mesh elements 30B in close contact with each other.The liner 20 and the sheet-shaped mesh members 30B are heated while being rotated together with the holding member 200 in a heating furnace in the state where the liner 20 and the sheet-shaped mesh members 30B are held by the holding member 200.

[0058] The holding element 200 has a cylindrical shape. The lining 20 with the sheet-like grid element 30B is received in the holding element 200. The holding element 200 comprises a semi-cylindrical first side wall 201 and a semi-cylindrical second side wall 202, which face each other along the central axis of the holding element 200. A circumferential end of the first side wall 201 is connected to a circumferential end of the second side wall 202 via a hinge 204. The first side wall 201 rotates about the hinge 204 relative to the second side wall 202.

[0059] As indicated by a dashed line in Fig. 13, the first side wall 201 is rotated relative to the second side wall 202 to open the holding element 200.

[0060] Therefore, the liner 20 with the sheet-like grid element 30B can be received in the holding element 200. The liner 20 is arranged in the holding element 200 such that the sheet-like grid element 30B faces the inner peripheral surface of the second side wall 202.

[0061] A locking mechanism 205 is provided at the circumferential ends of the first side wall 201 and the second side wall 202 opposite the hinge 204. The locking mechanism 205 couples the first side wall 201 and the second side wall 202 in a state where the first side wall 201 and the second side wall 202 are closed, thereby restricting the rotation of the first side wall 201 and the second side wall 202. After the liner 20 is housed in the holding member 200, the first side wall 201 and the second side wall 202 are fixed by the locking mechanism 205.

[0062] A plurality of support members 210 are attached to the support member 200 to support the sheet-like grid elements 30B and the lining 20 in the support member 200. Each support member 210 is a bolt that passes through the first side wall 201 or the second side wall 202. The plurality of support members 210 of each side wall 201 or 202 are arranged in a direction along the central axis of the support member 200, the illustration being omitted since the support members 210 are in Fig. 13 overlap. The support members 210, which extend through the first side wall 201, press the fibers 24 wound around the side surface of the liner 20 at their distal and front ends, respectively. The support members 210, which extend through the second side wall 202, press the two ends of each sheet-like mesh member 30B in the circumferential direction of the liner 20 at their distal and front ends, respectively. A position of the central axis CX of the liner 20 can be adjusted by adjusting the insertion depths of the support members 210. This makes it possible to suppress heating temperature unevenness that may be caused by misalignment of the central axis CX of the liner 20 from the central axis of the holding member 200.

[0063] A damping member 215 is disposed between each support member 210 and the sheet-like mesh member 30B or the fiber 24 wound around the liner 20. The damping member 215 is made of a thermosetting resin 25 of the same type as the thermosetting resin 25 impregnated into the fibers 24. In the thermal curing step, the damping member 215 is melted and thermally cured while being integrated with the thermosetting resin 25 of the fiber layer 23 or the protective layer 27B. After the thermal curing step, a mass of the thermally cured damping member 215 remaining on the surface layer of the high-pressure tank 10B is removed by grinding or the like. This operation reduces the occurrence of a case where a support mark is left on the surface layer of the high-pressure tank 10B by the support member 210 of the holding member 200.

[0064] According to the high-pressure tank 10B of the second embodiment described above, the protective layer 27B includes the sheet-like mesh members 30B that maintain their shape as a sheet-like shape. This increases the strength of the protective layer 27B. The sheet-like mesh member 30B of the protective layer 27B expands or contracts due to mesh deformation. Therefore, the protective layer 27B can follow the expansion and contraction of the high-pressure tank 10B. This increases the durability of the protective layer 27B. Furthermore, the sheet-like mesh member 30B is arranged in a desired region to form the protective layer 27B covering only that region. Therefore, the protective layer 27B can be easily formed only in a region with a high protection requirement.In this way, it is possible to suppress an increase in the weight of the high-pressure tank 10B or an increase in manufacturing costs by forming the protective layer 27B in a region with less protection requirement. According to the high-pressure tank 10B of the second embodiment and its manufacturing method, various actions and effects described in connection with the first embodiment can be achieved. Third embodiment:

[0065] Fig. 14 is a schematic side view showing a high-pressure tank 10C of a third embodiment. The structure of the high-pressure tank 10C of the third embodiment is substantially the same as the structure of the high-pressure tank 10B of the second embodiment, except that a sheet-shaped mesh member 30C is used in the third embodiment instead of the sheet-shaped mesh members 30B described in the second embodiment. A protective layer 27C of the third embodiment is formed by penetrating the thermosetting resin 25 into the pores 31 of a single sheet-shaped mesh member 30C.

[0066] Fig. 15 is a schematic perspective view showing the structure of the sheet-like mesh member 30C. The sheet-like mesh member 30C of the third embodiment is made of expanded metal, similar to the sheet-like mesh member 30B of the second embodiment, but differs from the sheet-like mesh member 30B of the second embodiment in the opening shapes of the pores 31. In the sheet-like mesh member 30C, each of the threads 33 surrounding the pore 31 has two bent portions 33c. Therefore, the thread 33 is bent into a cranked shape. In the sheet-like mesh member 30C, each thread 33 can be bent at the two bent portions 33c in addition to the connector 34 as a connection. In the sheet-like mesh member 30C, the opening shape of each pore 31 can be changed more freely. Therefore, the sheet-like grid element 30C can expand and contract independently in the width direction X and in the length direction Y.With the sheet-like grid element 30C, the ability of the protective layer 27C to follow the expansion and contraction of the high-pressure tank 10C can be increased.

[0067] Fig. 16 is a schematic view showing a process for manufacturing the sheet-shaped grid member 30C. In steps A, B and C in an upper part of the drawing page of Fig. 16, a metal sheet 300 supported by conveyor rollers 320 is pressed once through an upper die 310 and a lower die 312, each having a thin plate shape corresponding to the shapes of the threads 33. In this way, regions 31a are formed in the sheet 300, each corresponding to a half of the pore 31. After the first press, the sheet 300 is conveyed by the conveyor rollers 320 by a distance corresponding to the thickness of the upper die 310 and the lower die 312. Furthermore, the positions of the upper die 310 and the lower die 312 are shifted in a direction orthogonal to the conveying direction of the sheet 300 by a distance corresponding to one half of the dimension of the pore 31 in the width direction X. In steps D, E, and F in a lower part of the drawing page of Fig. 16, regions 31b, each corresponding to the remaining half of the pore 31, are formed in a second press using the upper die 310 and the lower die 312. The sheet-like mesh member 30C of the third embodiment can be manufactured with the same manufacturing apparatus as the sheet-like mesh member 30B of the second embodiment by replacing only the upper die 310 and the lower die 312.

[0068] According to the third embodiment described above, the followability of the protective layer 27C during the expansion and contraction of the high-pressure tank 10C is increased because the sheet-like mesh member 30C to be deformed can expand and contract more freely in the width direction X and the longitudinal direction Y than the sheet-like mesh member 30B of the second embodiment. According to the high-pressure tank 10C of the third embodiment and its manufacturing method, various actions and effects described in connection with the aforementioned embodiments can be achieved. Fourth embodiment:

[0069] Fig. 17 is a schematic perspective view showing the structure of a sheet-like mesh member 30D to be used as a porous member 30 in a high-pressure tank of a fourth embodiment. The structure of the high-pressure tank of the fourth embodiment is substantially the same as the structure of the high-pressure tank 10C of the third embodiment, except that the sheet-like mesh member 30D of the fourth embodiment is used instead of the sheet-like mesh member 30C described in the third embodiment. The sheet-like mesh member 30D of the fourth embodiment is substantially identical to the sheet-like mesh member 30C of the third embodiment, except that the opening shapes of the pores 31 differ as described below.

[0070] The structure of the sheet-like mesh member 30D of the fourth embodiment corresponds to a structure in which the bent portions 33c of each filament 33 described in the third embodiment are changed into curved portions. Each filament 33 has a trigonometric waveform shape. The opening shape of each pore 31 of the sheet-like mesh member 30D corresponds to a shape in which the ends of three ellipses arranged in a line in the direction of the major diameter are connected to each other.

[0071] According to the sheet-like mesh member 30D of the fourth embodiment, the stress in each thread 33 is dispersed when the sheet-like mesh member 30D is expanded or contracted by changing the opening shape of the pore 31. Therefore, the stress concentration is suppressed when the sheet-like mesh member 30D is expanded or contracted. According to the sheet-like mesh member 30D of the fourth embodiment, the durability of the protective layer of the high-pressure tank can be further increased. The sheet-like mesh member 30D of the fourth embodiment can be easily manufactured, similar to the sheet-like mesh member 30C of the third embodiment, by only changing the shapes of the upper die 310 and the lower die 312 shown in Fig. 16. According to the high-pressure tank of the fourth embodiment and its manufacturing method, various actions and effects described in connection with the aforementioned embodiments can be achieved. Fifth embodiment:

[0072] Fig. 18 is a schematic side view showing a high-pressure tank 10E of a fifth embodiment. Fig. 19 is a schematic side view of the high-pressure tank 10E of the fifth embodiment, viewed from a direction along the central axis CX. The structure of the high-pressure tank 10E of the fifth embodiment is substantially identical to the structure of the high-pressure tank 10C of the third embodiment, except for the following features.

[0073] As in Fig. As shown in Fig. 18, the high-pressure tank 10E of the fifth embodiment is provided with a first protective layer 27Ea and a second protective layer 27Eb instead of the protective layer 27C described in the third embodiment. The first protective layer 27Ea and each second protective layer 27Eb are arranged apart from each other on the cylinder 11 at positions where the first protective layer 27Ea and the second protective layer 27Eb oppose each other across the central axis CX.

[0074] As in Fig. 18 and Fig. 19, the first protective layer 27Ea covers a part of the peripheral area of ​​the cylinder 11 over the area between the two hoods 12a and 12b, similar to the protective layer 27C described in the third embodiment. The first protective layer 27Ea covers the cylinder 11 in its circumferential direction in a range of about 1 / 3 to 1 / 2 of the circumference of the cylinder 11.

[0075] As in Fig. 18, the high-pressure tank 10E is provided with a plurality of second protective layers 27Eb. The second protective layers 27Eb are arranged apart from each other in the direction along the central axis CX. The second protective layers 27Eb include a second protective layer provided closer to the first hood 12a than to the second hood 12b, and a second protective layer provided closer to the second hood 12b than to the first hood 12a. The two second protective layers 27Eb are provided at symmetrical positions beyond the center of gravity of the high-pressure tank 10E. As shown in Fig. As shown in Figure 19, each of the second protective layers 27Eb covers the cylinder 11 in its circumferential direction in a range of approximately 1 / 3 to 1 / 2 of the circumference of the cylinder 11. In other embodiments, one or more second protective layers 27Eb may be further provided between the two second protective layers 27Eb in the vicinity of the hoods 12a and 12b. In other embodiments, a single second protective layer 27Eb may be provided.

[0076] It will be Fig. 18 and Fig. 19. Each of the protective layers 27Ea and 27Eb includes a sheet-shaped grid element 30E. The structure of the sheet-shaped grid element 30E is substantially the same as the structure of the sheet-shaped grid element 30C of the third Fig. 15, except that the fastening means 37 described below are attached to both ends. The high-pressure tank 10E is manufactured by arranging the sheet-like grid elements 30E provided with the fastening means 37 on the fibers 24 of the liner 20, onto which the fibers 24 are wound, and causing the thermosetting resin 25 to penetrate into the pores 31 of the sheet-like grid elements 30E and thermally curing the thermosetting resin 25 in the thermal curing step. In other embodiments, the sheet-like grid element 30E may have a structure in which the fastening means 37 are attached to the sheet-like grid element 30B of the second embodiment shown in Fig. 12, the sheet-like grid element 30C of the third embodiment shown in Fig. 15 or the sheet-like grid element 30D of the fourth embodiment shown in Fig. 17 illustrated embodiment.

[0077] The sheet-like mesh member 30E of each of the protective layers 27Ea and 27Eb has the fasteners 37 at the respective ends in the circumferential direction of the cylinder 11. Each fastener 37 includes a plate portion 38 and a fastener 39. The plate portion 38 is connected to the end of the sheet-like mesh member 30E and extends outward from the surface of the high-pressure tank 10E. The fastener 39 is made of rubber and is connected to the plate portion 38. The brackets SP are connected to the fasteners 37 to support the high-pressure tank 10E arranged in the fuel cell vehicle. The brackets SP extend on both sides of the high-pressure tank 10E from the second protective layer 27Eb side to the first protective layer 27Ea side and are connected to the corresponding fasteners 37.

[0078] It will be Fig. 18. The first protective layer 27Ea is provided with the fastening means 37 at positions near the two ends in the direction of the central axis CX. The fastening means 37 are preferably arranged at symmetrical positions with respect to the center of gravity of the high-pressure tank 10E. Every second protective layer 27Eb is provided with the fastening means 37 in the center in the direction of the central axis CX. The fastening means 37 of the first protective layer 27Ea and the fastening means 37 of the second protective layer 27Eb are offset in the direction along the central axis CX to prevent interactions between the Fig. 19 to avoid the SP brackets shown.

[0079] Fig. 20 is a schematic sectional view of the fastening means 37, cut along a line XX-XX in Fig. 19. The plate portion 38 of the fastener 37 has a through hole 38h through which the fastener 39 is fastened. The fastener 39 is inserted through the through hole 38h of the plate portion 38. The fastener 39 is fixed to the plate portion 38 by fitting the peripheral edges of the through hole 38h into grooves 39g formed on the outer periphery of the fastener 39. The fastener 39 has a screw hole 39h extending through the fastener 39 in the thickness direction of the plate portion 38. The fastener 37 is connected to the bracket SP by tightening a bolt BT inserted through the screw hole 39h of the fastener 39 and a nut NT disposed inside the hollow bracket SP. According to the fastener 37, the fastener 39 can absorb vibrations from the bracket SP.This structure suppresses detachment of the high-pressure tank 10E from the bracket SP due to a reduction in the fastening performance of the fastener 37 by the vibration.

[0080] Fig. 21 is a schematic diagram showing an example of a mounting position of the high-pressure tank 10E in a fuel cell vehicle 400. The fuel cell vehicle 400 has a cabin 401, a trunk 402, and a floor panel 405. Passengers sit in the cabin 401. The trunk 402 is arranged behind the cabin 401, and luggage is loaded into the trunk 402. The floor panel 405 serves as the floor of the cabin 401 and the trunk 402. The high-pressure tank 10E is mounted below the floor panel 405. A resin cover member 407 is provided below the high-pressure tank 10E. The cover member 407 is connected to the floor panel 405 and covers the high-pressure tank 10E from below.

[0081] The brackets SP are connected to the bottom plate 405, extend downward from the bottom plate 405, and are connected to the fasteners 37 of the high-pressure tank 10E. The downward movement of the high-pressure tank 10E is suppressed by coupling the fasteners 37 of the first protective layer 27Ea to the brackets SP. The upward movement of the high-pressure tank 10E is limited by coupling the fasteners 37 of the second protective layer 27Eb to the brackets SP.

[0082] The high-pressure tank 10E is mounted so that the first protective layer 27Ea faces the cover member 407 and the second protective layers 27Eb face the bottom plate 405. Thus, the first protective layer 27Ea, which has a large coverage area, can protect a bottom portion of the high-pressure tank 10E that is susceptible to damage caused by interaction with the road surface or impact from flying foreign objects such as stones. The second protective layer 27Eb, which is disposed in a top portion of the high-pressure tank 10E that is less susceptible to such damage, has a small coverage area. Accordingly, weight increase of the high-pressure tank 10E is suppressed.

[0083] The fasteners 37 are arranged on both sides of the central axis CX and are supported by the brackets SP in a state where the high-pressure tank 10E is floating, so that spaces are provided above and below the high-pressure tank 10E. The spaces function as buffer areas BF in which the high-pressure tank 10E can expand or contract. When the high-pressure tank 10E expands or contracts, the amount of displacement of the central axis CX is reduced compared to a case where the high-pressure tank 10E is directly arranged on the ground. This structure reduces the occurrence of a case where devices such as a valve and a pipe connected to the high-pressure tank 10E or devices arranged around the high-pressure tank 10E receive forces caused by the displacement of the high-pressure tank 10E when the high-pressure tank 10E expands or contracts.In the fifth embodiment, the buffer region BF is a space. In other embodiments, the buffer region BF may be a region in which a deformable member is arranged that follows the expansion and contraction of the high-pressure tank 10E.

[0084] In the fifth embodiment, the high-pressure tank 10E is mounted in the area below the trunk 402. In other embodiments, the high-pressure tank 10E may be mounted in an area below the cabin 401. The high-pressure tank 10E need not be mounted under the floor panel 405, but may be mounted, for example, in an engine compartment 408 in front of the cabin 401. In this case, the fastening means 37 of the high-pressure tank 10E are attached to the brackets SP, which are coupled to a wall in the engine compartment 408.

[0085] The high-pressure tank 10E of the fifth embodiment described above has the first protective layer 27Ea and the second protective layer 27Eb with different coverage areas. Therefore, the protective effect of the high-pressure tank 10E is increased while suppressing the weight increase of the high-pressure tank 10E. The protective layers 27Ea and 27Eb are provided with the fastening means 37. This allows the high-pressure tank 10E to be easily fastened. According to the high-pressure tank 10E of the fifth embodiment, various actions and effects described in connection with the aforementioned embodiments can be achieved. Other embodiments:

[0086] For example, various structures described in the above embodiments may be modified as follows. The following other embodiments are considered examples of embodiments for implementing the technology disclosed herein that are similar to the embodiments described above. Other embodiment 1:

[0087] The fluid stored in each of the high-pressure tanks 10A, 10B, 10C, and 10E of the above-described embodiments is not limited to hydrogen. In other embodiments, each of the high-pressure tanks 10A, 10B, 10C, and 10E may store natural gas, liquefied petroleum gas, or other fluids. Each of the high-pressure tanks 10A, 10B, 10C, and 10E may be mounted on a natural gas vehicle or other vehicles, as well as on the fuel cell vehicle. Each of the high-pressure tanks 10A, 10B, 10C, and 10E may be attached to a movable object other than the vehicle or installed in a building. Other embodiment 2:

[0088] The porous member 30 may have a different structure than the tubular mesh member 30A and the sheet-like mesh members 30B, 30C, 30D, and 30E. For example, the porous member 30 may be formed by knitting wires into a mesh or mesh, or it may be made of a perforated metal with through-holes in a metal sheet. The porous member 30 may be a tubular mesh member in which a mesh member that hardly generates a restoring force when stretched is formed into a tubular shape.

Claims

[1] High-pressure tank (10B; 10C; 10E), comprising: a liner (20) having an interior space (22) for storing a fluid; a fiber layer (23) with Fibers (24) wound around an outer surface of the lining (20), and a thermosetting resin (25) that has been cured and covers the surfaces of the fibers (24); and a protective layer (27A; 27B; 27C; 27Ea, 27Eb) comprising a porous member (30) disposed on the fibers (24), wherein the porous member (30) has a plurality of pores (31) extending through the porous member (30) in a thickness direction of the porous member (30), wherein the thermosetting resin (25) has penetrated into the pores (31), wherein the porous element (30) comprises a sheet-like grid element (30B; 30C; 30D; 30E) comprising a grid defining the pores (31) and configured to expand or contract by deformation of the grid, characterized by , that the pores (31) have a rhomboid shape [2] High-pressure tank (10B; 10C; 10E), comprising: a liner (20) having an interior space (22) for storing a fluid; a fiber layer (23) with Fibers (24) wound around an outer surface of the lining (20), and a thermosetting resin (25) that has been cured and covers the surfaces of the fibers (24); and a protective layer (27A; 27B; 27C; 27Ea, 27Eb) comprising a porous member (30) disposed on the fibers (24), wherein the porous member (30) has a plurality of pores (31) extending through the porous member (30) in a thickness direction of the porous member (30), wherein the thermosetting resin (25) has penetrated into the pores (31), wherein the porous element (30) comprises a sheet-like grid element (30B; 30C; 30D; 30E) comprising a grid defining the pores (31) and configured to expand or contract by deformation of the grid, characterized by , that each of the pores (31) has a shape corresponding to a shape in which ends of a plurality of ellipses arranged in series in a direction of the major diameter are connected to each other. [3] The high-pressure tank (10E) according to claim 1 or 2, wherein the protective layer (27Ea, 27Eb) comprises a first protective layer (27Ea) and a second protective layer (27Eb) arranged away from each other at positions where the first protective layer (27Ea) and the second protective layer (27Eb) oppose each other across a central axis (CX) of the high-pressure tank (10E). [4] High-pressure tank (10B; 10C; 10E) according to claim 1 or 2 or 3, wherein the sheet-shaped grid member (30B; 30C; 30D; 30E) is formed at one end of the sheet-shaped grid member (30B; 30C; 30D; 30E) with a fastening means (37) which extends outwardly from a surface of the high-pressure tank (10B; 10C; 10E) and can be connected to a bracket (SP) which is configured to support the high-pressure tank (10B; 10C; 10E). [5] High-pressure tank (10B; 10C; 10E) according to one of claims 1 and 3 to 4 or claims 2 and 3 to 4, wherein the sheet-like grid element (30B; 30C; 30D; 30E) comprises a plurality of threads (33) and a plurality of connectors (34) which respectively connect ends of the threads, and the threads (33) and the connectors (34) define the pores (31). [6] High-pressure tank (10B; 10C; 10E) according to one of claims 5, wherein each of the threads (33) is bent into a cranked shape. [7] Vehicle (400) with the high-pressure tank (10B; 10C; 10E) according to one of claims 4 to 6, wherein the vehicle (400) has the holder (SP), wherein the fastening means (37) extends on both sides over a central axis (CX) of the high-pressure tank (10B; 10C; 10E), and the high-pressure tank (10B; 10C; 10E) is supported by the bracket (SP) in a state in which buffer regions (BF) are formed above and below the high-pressure tank (10B; 10C; 10E), in which buffer regions the high-pressure tank (10B; 10C; 10E) can expand or contract. [8] A method of manufacturing a high-pressure tank (10B; 10C; 10E), the method comprising: Preparing a lining (20) having an interior space for storing a fluid; Preparing a porous member (30) having a plurality of pores (31) extending through the porous member (30) in a thickness direction of the porous member (30); Winding fibers (24) impregnated with a thermosetting resin (25) around a surface of the lining (20); Arranging the porous element (30) on the fibers (24); and thermally curing the thermosetting resin (25) impregnated into the fibers (24) by heating the lining (20) with the porous element (30) while the thermosetting resin (25) flows into the pores (31) of the porous element (30), wherein the porous element (30) comprises a sheet-like grid element (30B; 30C; 30D; 30E) comprising a grid defining the pores (31) and configured to expand or contract by deformation of the grid, characterized by , that the pores (31) have a rhomboid shape. [9] A method of manufacturing a high-pressure tank (10B; 10C; 10E), the method comprising: Preparing a lining (20) having an interior space for storing a fluid; Preparing a porous member (30) having a plurality of pores (31) extending through the porous member (30) in a thickness direction of the porous member (30); Winding fibers (24) impregnated with a thermosetting resin (25) around a surface of the lining (20); Arranging the porous element (30) on the fibers (24); and thermally curing the thermosetting resin (25) impregnated into the fibers (24) by heating the lining (20) with the porous element (30) while the thermosetting resin (25) flows into the pores (31) of the porous element (30), wherein the porous element (30) comprises a sheet-like grid element (30B; 30C; 30D; 30E) comprising a grid defining the pores (31) and configured to expand or contract by deformation of the grid, characterized by , that each of the pores (31) has a shape corresponding to a shape in which ends of a plurality of ellipses arranged in series in a direction of the major diameter are connected to each other.

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