A combined thermal insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle and a laying method thereof

Abstract

The present invention discloses a combined insulation support structure for a vehicle-mounted cryogenic, high-pressure hydrogen storage bottle and a method for laying the layers thereof. The structure comprises a stainless steel outer shell, a hydrogen storage liner, an insulation support ring positioned between the stainless steel outer shell and the middle section of the hydrogen storage liner, and a double-layer insulation support plate positioned between the stainless steel outer shell and the front and rear end caps of the hydrogen storage liner. The double-layer insulation support plate comprises an inner plate in contact with the hydrogen storage liner, an outer plate in contact with the stainless steel outer shell, and inner and outer connecting columns uniformly distributed between the inner and outer plates for connection. The combined insulation support structure of the present invention does not damage the carbon fiber winding layer of the hydrogen storage liner, reduces insulation loss, and provides high support reliability.

Description

Technical Field

[0001] The present invention belongs to the field of design and manufacturing of hydrogen storage pressure vessel equipment, and in particular relates to a combined insulation support structure of a vehicle-mounted deep-cold high-pressure hydrogen storage bottle and a laying method thereof. Background Art

[0002] Applying hydrogen energy to vehicle fuel is a crucial component of our energy strategy. On-board physical hydrogen storage methods primarily include high-pressure gaseous hydrogen storage, cryogenic liquid hydrogen storage, and deep-cold high-pressure hydrogen storage. Currently, high-pressure gaseous hydrogen storage is the most mature and commercially widely used hydrogen storage technology. However, this method suffers from low hydrogen mass density and poor economic benefits, requiring cost reduction and improved stability. Low-temperature liquid hydrogen storage involves compressing hydrogen and then deep-cooling it to below 21K to liquefy it. This method significantly increases hydrogen mass storage density to 5.1%, but its dormancy period is too short, only 2 to 4 days, making it difficult to use for long-term storage and transportation. Deep-cold high-pressure hydrogen storage is a more promising method for medium- and long-distance energy supply.

[0003] Deep-cold, high-pressure hydrogen storage allows hydrogen to be stored and transported in a supercritical state at low temperature and high pressure. At this time, the hydrogen storage density is further increased to 7.4%, and the lossless storage time is also extended from 2-3 days of low-temperature liquid hydrogen storage to 8.5-20.5 days. Deep-cold, high-pressure hydrogen storage bottles are the core components for achieving high-energy hydrogen storage. Deep-cold, high-pressure hydrogen storage bottles are mainly composed of a hydrogen storage liner, a support structure, a high-vacuum multi-layer insulation layer, and an outer shell. First, unlike ordinary cryogenic containers, the inner liner of a deep-cold, high-pressure hydrogen storage bottle needs to be resistant to high pressure and prevent hydrogen penetration. The outside is wrapped with carbon fiber, so traditional fixing methods such as welding and riveting cannot be used on the outer surface of the hydrogen storage bottle liner. Secondly, the temperature of the hydrogen storage liner is about 20K, and the outer shell is exposed to room temperature of 293K. In high-efficiency insulation equipment, as the insulation efficiency increases, the proportion of the part passing through the thermal bridge increases. In order to reduce the heat flow through the thermal bridge (support structure), the support structure needs to meet the insulation performance requirements. Finally, considering the complex road conditions encountered during vehicle operation, requirements are placed on the strength of the support structure of the on-board deep-cold high-pressure hydrogen storage bottle; however, the support structure in the existing technology cannot meet the requirements of fixing method, insulation performance and support strength.

[0004] Therefore, it is urgent to solve the above problems. Summary of the Invention

[0005] Purpose of the invention: The first purpose of the present invention is to provide a combined insulation support structure for a vehicle-mounted deep-cold high-pressure hydrogen storage bottle that does not damage the carbon fiber winding layer of the hydrogen storage liner, has low insulation loss and high support reliability.

[0006] The second object of the present invention is to provide a method for laying layers of a combined insulation support structure for a vehicle-mounted deep-cold high-pressure hydrogen storage bottle.

[0007] Technical solution: To achieve the above objectives, the present invention discloses a combined insulating support structure for a vehicle-mounted deep-cold high-pressure hydrogen storage bottle, comprising a stainless steel outer shell, a hydrogen storage liner, an insulating support ring located between the stainless steel outer shell and the middle section of the hydrogen storage liner, and a double-layer insulating support plate located between the stainless steel outer shell and the front and rear heads of the hydrogen storage liner. The double-layer insulating support plate comprises an inner plate in contact with the hydrogen storage liner, an outer plate in contact with the stainless steel outer shell, and inner and outer connecting columns evenly distributed between the inner plate and the outer plate for connecting purposes.

[0008] The inner disk is an annular disk, and the inner surface of the inner disk is a curved surface that matches the shape of the outer surface of the hydrogen storage liner head.

[0009] Preferably, the outer disc comprises an outer upper disc, an outer lower disc and spokes for connecting the outer upper disc and the outer lower disc, wherein the spokes are arranged alternately with the inner and outer connecting posts.

[0010] Furthermore, the curvature of the outer disk is greater than the curvature of the head of the stainless steel shell.

[0011] Furthermore, the thermal insulation support ring includes a circular ring, outer support legs uniformly distributed on the outside of the circular ring, and inner support legs uniformly distributed on the inside of the circular ring, wherein the outer support legs and the inner support legs are arranged in an alternating manner.

[0012] The present invention discloses a laying method for a combined insulation support structure of an on-vehicle cryogenic high-pressure hydrogen storage bottle, comprising the following steps: a double-layer insulation support disc is made of low-temperature insulation epoxy fiberglass reinforced plastics (FRP) formed by integrally laying glass fibers impregnated with epoxy resin, utilizing automatic fiber placement technology, with the fibers oriented along the circumferential direction of the double-layer insulation support disc and along a path specified by the geometric shape of the double-layer insulation support disc, and the structure is formed by laying the fibers, cutting them short, pressing them with rollers, and heating and curing them;

[0013] The insulating support ring is made of low-temperature insulating epoxy fiberglass, which is made by layering glass fibers impregnated with epoxy resin. Using automatic fiber placement technology, the direction of each fiber layer is circumferential to the insulating support ring. Following the path specified by the geometric shape of the insulating support ring, the fibers are laid, shortened, pressed with rollers, and heated for curing. Several layers of glass fiber are laid, and additional layers are laid on the inner and outer support legs.

[0014] The material of the inner and outer connecting columns is low-temperature insulating epoxy fiberglass made of glass fiber impregnated with epoxy resin and laid as an integral layer. Automatic tape laying technology is used, and the direction of each layer of fiber is the length direction of the inner and outer connecting columns. The bandwidth of the laid glass fiber is selected according to the width of the inner and outer connecting columns. After the fiber is laid, cut, pressed with a pressure roller, and heated and solidified, several layers of glass fiber are laid.

[0015] The connection between the inner and outer connecting posts and the inner disk is a Π-shaped interface, which includes a U-shaped carbon fiber structure and two L-shaped carbon fiber structures. The middle part of the U-shaped carbon fiber structure is first cured and connected to the inner and outer connecting posts, and the bottom is then cured and connected to the inner disk for a secondary connection. The two L-shaped carbon fiber structures are laid in an L-shape along the surface of the U-shaped carbon fiber structure and the inner disk; the empty space between the U-shaped carbon fiber structure and the two L-shaped carbon fiber structures is filled with a filler made of carbon fiber prepreg.

[0016] Or the connection between the inner and outer connecting columns and the outer disk is a Π-shaped interface, which includes a U-shaped carbon fiber structure and two L-shaped carbon fiber structures, wherein the middle part of the U-shaped carbon fiber structure is first cured and connected to the inner and outer connecting columns, and the bottom is then cured and connected to the outer disk for a secondary time, and the two L-shaped carbon fiber structures are laid in an L shape along the surface of the U-shaped carbon fiber structure and the outer disk; the empty space between the U-shaped carbon fiber structure and the two L-shaped carbon fiber structures is filled with filler made of carbon fiber prepreg.

[0017] Preferably, the U-shaped carbon fiber structure is formed by integrally laying composite materials, and using automatic fiber placement technology, U-shaped laying is performed along the surfaces of the inner and outer connecting columns. The fiber directions are grouped in the direction of [45°, 0°, -45°], and multiple groups are laid. After curing, the bottom is then connected to the inner disk or the outer disk for a secondary curing.

[0018] Furthermore, the L-shaped carbon fiber structure is made of composite materials that are laid in one layer. Utilizing automatic fiber placement technology, L-shaped layers are laid along the U-shaped carbon fiber structure and the surface of the inner or outer disk. The fiber directions are grouped in [45°, 0°, -45°], and multiple groups are laid.

[0019] Furthermore, the filler is made of composite prepreg, and the fiber direction is along the transverse direction of the joint.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0021] (1) The present invention does not require welding of the outer surface of the inner tank. Instead, the insulating support ring located in the middle section is used to fix the vertical spatial position of the hydrogen storage inner tank and provide a basis for reliable support of the two ends to the double-layer insulating support plate, that is, only axial fixation is required;

[0022] (2) The double-layer insulation support disk of the present invention can ensure axial fixation within a limited head space. The inner disk of the double-layer support disk is consistent with the shape of the outer surface of the head. The uniqueness of the installation position of the annular inner disk is utilized to conveniently achieve radial fixation on the hydrogen storage liner without damaging the carbon fiber wrapping layer on the surface of the hydrogen storage liner. The double-layer insulation support disk is subjected to the extrusion force of the hydrogen storage liner and the stainless steel shell head, thereby forming a reaction force at the hydrogen storage liner and the stainless steel shell head to achieve axial fixation.

[0023] (3) The combined structural design of the double-layer insulation support plate and the insulation support ring of the present invention forms an effective fit between the hydrogen storage liner and the stainless steel outer shell. Its spatial structure and combined force realize the spatial fixation of the hydrogen storage liner. There is no need to perform mechanical processing such as welding or riveting on the outside of the pressure vessel liner to achieve the relative fixation of the liner to the outer shell, ensuring that the hydrogen storage liner does not slip during transportation and realizing the non-destructive assembly of the support structure to the outer wall of the liner of the deep-cold high-pressure hydrogen storage bottle. It also has the characteristics of simple structure, easy manufacturing and simple assembly, and is particularly suitable as a deep-cold high-pressure hydrogen storage bottle with a carbon fiber wrapped liner.

[0024] (4) In the double-layer insulation support disk of the present invention, the spokes of the outer disk and the inner and outer connecting columns are staggered, which realizes a longer heat transfer path in a limited space. At the same time, the curvature of the outer disk is greater than the curvature of the outer shell head, which reduces the contact area with the outer shell, effectively increases the thermal resistance, and slows down the rate of heat transfer from the outside to the inside;

[0025] (5) The automatic tape laying technology of the layer laying method of the present invention uses a fixed-section prepreg tape, which is laid on the mold surface or the previous layer according to a planned path through a pressure roller; the automatic tape laying technology can conveniently and quickly manufacture large-scale planar components or simple small-curvature curved surface structures, and has a good molding effect. It can efficiently and accurately prepare front and rear end insulation support plates, insulation support rings, and U-shaped and L-shaped carbon fiber structures in batches, which is beneficial to batch production;

[0026] (6) The thermal insulation support structure of the present invention is made of low-temperature thermal insulation epoxy fiberglass made of alkali-free glass fiber impregnated with epoxy resin. The selection of materials ensures that the structure has sufficient strength and rigidity, while effectively reducing the heat flow through the thermal bridge part, which meets the insulation requirements of deep-cold high-pressure hydrogen storage bottles; in addition, fiberglass is less affected by the thermal expansion and contraction effect, which greatly alleviates the relative displacement problem of the support structure caused by thermal expansion and contraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the thermal insulation support structure of the present invention;

[0028] Figure 2 A partial cross-sectional view of the thermal insulation support structure of the present invention;

[0029] Figure 3 Schematic diagram of the structure of the double-layer insulation support plate in the present invention;

[0030] Figure 4 A top view of the double-layer thermal insulation support plate of the present invention;

[0031] Figure 5 for Figure 4 AA-direction cross-section;

[0032] Figure 6 It is a front view of the thermal insulation support ring of the present invention;

[0033] Figure 7 It is a left side view of the thermal insulation support ring of the present invention;

[0034] Figure 8 Schematic diagram of the fiber laying direction of the thermal insulation support ring in the present invention;

[0035] Figure 9 Schematic diagram of the Π-type joint in the present invention;

[0036] Figure 10 Schematic diagram of the fiber laying direction of each part of the Π-type joint in the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, a combined insulation support structure for a vehicle-mounted cryogenic, high-pressure hydrogen storage bottle includes a stainless steel shell 1, a hydrogen storage liner 2, an insulation support ring 3, a double-layer insulation support plate 4, a bottle mouth valve 5, and a coil 6. The insulation support ring 3 is located between the stainless steel shell 1 and the middle section of the hydrogen storage liner 2. There are two double-layer insulation support plates 4, which are located between the stainless steel shell and the front and rear ends of the hydrogen storage liner. The outer surface of the hydrogen storage liner 2 is wrapped with a carbon fiber layer. The insulation support ring 3 and the double-layer insulation support plate 4 are arranged on the carbon fiber wrapping layer. The interlayer between the stainless steel shell 1 and the hydrogen storage liner 2 is evacuated to form a vacuum insulation layer.

[0039] like Figure 4 and Figure 5 As shown, the double-layer insulation support disk 4 includes an inner disk 401, an outer disk 402 and inner and outer connecting columns 403. The inner side of the inner disk 401 is in contact with the hydrogen storage liner 2, and the outer side of the outer disk 402 is in contact with the stainless steel shell 1. The inner and outer connecting columns 403 are evenly distributed between the inner disk 401 and the outer disk 402, and the inner and outer connecting columns 403 are used for connection. The inner disk 401 is an annular disk, and the inner surface of the inner disk 401 is a curved surface that matches the shape of the outer surface of the head of the hydrogen storage liner 2. The outer disk 402 includes an outer upper disk 404, an outer lower disk 405 and spokes 406. The spokes 406 are used to connect the outer upper disk 404 and the outer lower disk 405, wherein the spokes 406 are staggered with the inner and outer connecting columns 403. The curvature of the outer disk 402 is greater than the curvature of the head of the stainless steel shell. As shown Figure 6 and Figure 7As shown, the insulation support ring 3 includes a circular ring 301, an outer support foot 302 and an inner support foot 303. The outer support foot 302 is evenly distributed on the outside of the circular ring 301, and the inner support foot 303 is evenly distributed on the inside of the circular ring 301, wherein the outer support foot 302 and the inner support foot 303 are staggered. The double-layer insulation support disk 4 is connected between the stainless steel shell 1 and the hydrogen storage liner 2, and the insulation support ring 3 supports the hydrogen storage liner in the middle section; the inner surface of the inner disk 401 of the double-layer insulation support disk 4 is a curved surface that matches the shape of the outer surface of the head of the hydrogen storage liner 2 and is in contact with the hydrogen storage liner 2; the outer end of the outer disk 402 of the double-layer insulation support disk 4 is connected to the stainless steel shell 1, and the diameter change of the head of the stainless steel shell 1 fixes the position of the double-layer insulation support disk 4; through the structural design and topological optimization of the support form, fixation and support without welding are achieved. As shown Figure 3 As shown, the structural design of the double-layer insulation support plate 4 meets the requirements of quick installation, without the need for additional design of the hydrogen storage tank and stainless steel shell. The double-layer insulation support plate 4 adopts a double-layer design, wherein the outer plate 402 is designed with an insulation structure. The outer plate 402 has multiple spokes, and each spoke is staggered with the inner and outer connecting columns, which increases the heat transfer path and reduces the insulation loss. Figure 1 and Figure 2 As shown, the curvature of the outer layer of the double-layer insulation support plate 4 is greater than the curvature of the shell head, which does not produce excessive surface contact with the shell, reducing heat transfer and improving insulation performance. Figure 6 As shown, the insulation support ring 3 consists of an outer support foot, a circular ring, and an inner support foot, wherein there are 3 inner support feet and 6 outer support feet. The inner and outer support feet are evenly distributed, which improves the support stability. The outer support feet are designed to reduce the contact area between the insulation support ring and the outer shell, reduce the heat transfer of the thermal bridge, and the inner and outer support feet are staggered to increase the heat transfer path and improve the insulation performance.

[0040] like Figure 8 As shown, a laying method of a combined insulation support structure of a vehicle-mounted deep-cold high-pressure hydrogen storage bottle in the present invention includes the following steps:

[0041] The double-layer insulation support disc is made of low-temperature insulation epoxy fiberglass, which is made by layering glass fibers impregnated with epoxy resin. Using the automated fiber placement technology (AFP), the fibers are oriented along the circumference of the double-layer insulation support disc. The fibers are laid down, shortened, rolled, and heated to cure, resulting in 60 layers of glass fiber.

[0042] The insulation support ring is made of low-temperature insulation epoxy fiberglass, which is made by layering glass fibers impregnated with epoxy resin. Using automatic fiber placement technology, the fiber orientation of each layer is circumferential to the insulation support ring. Following the path specified by the insulation support ring's geometry, the fibers are laid, shortened, rolled, and heated for 40 layers. An additional 20 layers are added to the inner and outer support legs.

[0043] like Figure 10 As shown, the material of the inner and outer connecting columns is low-temperature insulating epoxy fiberglass made of glass fiber impregnated with epoxy resin and laminated as a whole. Automatic tape laying technology is used. The direction of each layer of fiber is the length direction of the inner and outer connecting columns, and the bandwidth of the laminated glass fiber is selected according to the width of the inner and outer connecting columns. After the fiber is laid, cut, pressed with a pressure roller, and heated and solidified, 30 layers of glass fiber are laid.

[0044] like Figure 9 As shown, the inner disk 401 and the outer disk 402 are supported and connected by six inner and outer connecting columns 403 of fiberglass sheets evenly distributed around the circumference. The ends of the fiberglass sheets are connected to the inner disk 401 and the outer disk 402 respectively, forming a Π-shaped interface. The connection between the inner and outer connecting columns and the inner disk is a Π-shaped interface, which includes a U-shaped carbon fiber structure 407 and two L-shaped carbon fiber structures 408. The middle portion of the U-shaped carbon fiber structure is first cured and connected to the inner and outer connecting columns, and the bottom portion is then cured and connected to the inner disk for a second time. The two L-shaped carbon fiber structures are laid in an L-shape along the surface of the U-shaped carbon fiber structure and the inner disk; the empty space between the U-shaped carbon fiber structure and the two L-shaped carbon fiber structures is filled with a filler 409 made of carbon fiber prepreg.

[0045] Or the connection between the inner and outer connecting columns and the outer disk is a Π-shaped interface, which includes a U-shaped carbon fiber structure and two L-shaped carbon fiber structures, wherein the middle part of the U-shaped carbon fiber structure is first cured and connected to the inner and outer connecting columns, and the bottom is then cured and connected to the outer disk for a secondary time, and the two L-shaped carbon fiber structures are laid in an L shape along the surface of the U-shaped carbon fiber structure and the outer disk; the empty position between the U-shaped carbon fiber structure and the two L-shaped carbon fiber structures is filled with filler made of carbon fiber prepreg.

[0046] The U-shaped carbon fiber structure is made of an integrated layer of T700 / QY8911 composite material. Utilizing automatic fiber placement technology, U-shaped layers are laid along the surfaces of the inner and outer connecting columns. The fiber directions are grouped in [45°, 0°, -45°], with five layers laid out. After curing, the bottom is then connected to the inner or outer disc through secondary curing.

[0047] The L-shaped carbon fiber structure is made of an integrated layer of T700 / QY8911 composite material. Utilizing automatic fiber placement technology, L-shaped layers are laid along the U-shaped carbon fiber structure and the surface of the inner or outer disk. The fiber direction is [45°, 0°, -45°] as a group, and there are 5 groups of layers.

[0048] The filler is made of T700 / QY8911 composite prepreg, with the fiber direction along the transverse direction of the joint.

[0049] The thermal insulation support structure in the present invention is made of low-temperature thermal insulation epoxy fiberglass made of alkali-free glass fiber impregnated with epoxy resin. The selection of materials ensures that the structure has sufficient strength and rigidity, while effectively reducing the heat flow through the thermal bridge part, which meets the insulation requirements of deep-cold and high-pressure hydrogen storage bottles; in addition, fiberglass is less affected by thermal expansion and contraction effects, which greatly alleviates the relative displacement problem of the support structure caused by thermal expansion and contraction.

[0050] The automatic fiber placement technology in the present invention is similar to the automatic tape placement technology. It uses multiple independent prepreg bundles (also known as prepreg narrow tapes), which are individually tensioned, clamped, cut and re-fed. After being bundled into a prepreg tape with variable width in front of the pressure roller, it is laid on the mold surface or the previous layer according to a planned path; the automatic fiber placement technology can conveniently and quickly manufacture large and complex curved surface components; and the molding effect is good, and the front and rear end insulation support plates, insulation support rings and U-shaped and L-shaped carbon fiber structures involved in the present invention can be prepared in batches with high efficiency and high precision, which is beneficial to batch production.

Claims

1. A combined thermal insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle, characterized by: The invention comprises a stainless steel shell (1), a hydrogen storage liner (2), an insulating support ring (3) located between the stainless steel shell and the middle section of the hydrogen storage liner, and a double-layer insulating support disk (4) located between the stainless steel shell and the front and rear heads of the hydrogen storage liner, wherein the double-layer insulating support disk (4) comprises an inner disk (401) in contact with the hydrogen storage liner, an outer disk (402) in contact with the stainless steel shell, and inner and outer connecting columns (403) uniformly distributed between the inner disk and the outer disk for connecting purposes; the inner disk (401) is an annular disk, and the inner disk (402) is an outer disk. 1) is a curved surface that matches the shape of the outer surface of the hydrogen storage liner head; the outer disk (402) includes an outer upper disk (404), an outer lower disk (405) and spokes (406) for connecting the outer upper disk and the outer lower disk, wherein the spokes (406) and the inner and outer connecting columns (403) are arranged in a staggered manner; the thermal insulation support ring (3) includes a circular ring (301), outer supporting legs (302) uniformly distributed on the outer side of the circular ring and inner supporting legs (303) uniformly distributed on the inner side of the circular ring, wherein the outer supporting legs (302) and the inner supporting legs (303) are arranged in a staggered manner.

2. The combined thermal insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle according to claim 1, characterized in that: The curvature of the outer disk (402) is greater than the curvature of the head of the stainless steel shell.

3. A method for laying layers of a combined insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle according to any one of claims 1 to 2, characterized in that: The steps include: The double-layer insulation support disc is made of low-temperature insulation epoxy fiberglass, which is made by integrally layering glass fibers impregnated with epoxy resin. The double-layer insulation support disc is made by automatic fiber placement technology, with the fibers oriented along the circumferential direction of the double-layer insulation support disc and along a path specified by the geometric shape of the double-layer insulation support disc. The fibers are laid, shortened, pressed with rollers, and heated to solidify, resulting in multiple layers of glass fiber being laid. The insulating support ring is made of low-temperature insulating epoxy fiberglass, which is made by layering glass fibers impregnated with epoxy resin. Using automatic fiber placement technology, the direction of each fiber layer is circumferential to the insulating support ring. Following the path specified by the geometric shape of the insulating support ring, the fibers are laid, shortened, pressed with rollers, and heated for curing. Several layers of glass fiber are laid, and additional layers are laid on the inner and outer support legs. The material of the inner and outer connecting columns is low-temperature insulating epoxy fiberglass made of glass fiber impregnated with epoxy resin and laid as an integral layer. Automatic tape laying technology is used, and the direction of each layer of fiber is the length direction of the inner and outer connecting columns. The bandwidth of the laid glass fiber is selected according to the width of the inner and outer connecting columns. After the fiber is laid, cut, pressed with a pressure roller, and heated and solidified, several layers of glass fiber are laid.

4. The method for laying layers of a combined thermal insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle according to claim 3, characterized in that: The connection between the inner and outer connecting columns and the inner disk is a Π-shaped interface, which includes a U-shaped carbon fiber structure (407) and two L-shaped carbon fiber structures (408), wherein the middle portion of the U-shaped carbon fiber structure is first cured and connected to the inner and outer connecting columns, and the bottom portion is then cured and connected to the inner disk for a secondary time, and the two L-shaped carbon fiber structures are laid in an L-shaped manner along the U-shaped carbon fiber structure and the surface of the inner disk; The empty space between the U-shaped carbon fiber structure and the two L-shaped carbon fiber structures is filled with a filler (409) made of carbon fiber prepreg; Alternatively, the connection between the inner and outer connecting posts and the outer disk is a Π-shaped interface, which includes a U-shaped carbon fiber structure and two L-shaped carbon fiber structures, wherein the middle portion of the U-shaped carbon fiber structure is first cured and connected to the inner and outer connecting posts, and the bottom portion is then cured and connected to the outer disk for a secondary connection, and the two L-shaped carbon fiber structures are laid in an L-shaped pattern along the surface of the U-shaped carbon fiber structure and the outer disk; The empty space between the U-shaped carbon fiber structure and the two L-shaped carbon fiber structures is filled with fillers made of carbon fiber prepreg.

5. The method for laying layers of a combined thermal insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle according to claim 4, characterized in that: The U-shaped carbon fiber structure is formed by integrally laying composite materials. Utilizing automatic fiber placement technology, U-shaped laying is performed along the surfaces of the inner and outer connecting columns. The fiber directions are grouped in the direction of [45°, 0°, -45°], and multiple groups are laid. After curing, the bottom is then connected to the inner or outer disk through secondary curing.

6. The method for laying layers of a combined thermal insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle according to claim 4, characterized in that: The L-shaped carbon fiber structure is formed by integrally laying composite materials. Utilizing automatic fiber placement technology, L-shaped laying is performed along the U-shaped carbon fiber structure and the surface of the inner disk or outer disk. The fiber directions are grouped in the direction of [45°, 0°, -45°], and multiple groups of layers are laid.

7. The method for laying layers of a combined insulation support structure for a vehicle-mounted cryogenic high-pressure hydrogen storage bottle according to claim 4, characterized in that: The filler is made of composite prepreg, and the fiber direction is along the transverse direction of the joint.

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