Lightweight liquid hydrogen storage tank and manufacturing method thereof

Abstract

The invention provides a light-weight liquid hydrogen storage tank and a manufacturing method thereof. The light-weight liquid hydrogen storage tank comprises an inner container, a heat insulation layer, a lining film, a composite material outer shell and a double-seal-head structure. A heat insulation layer is arranged outside the inner container and forms a vacuum interlayer with the lining film. The upper sealing head is connected with the top end of the liner through a corrugated pipe, so that a heat conduction path is effectively prolonged and low-temperature axial shrinkage is compensated; a heat insulation positioning ring is arranged between the lower sealing head and the bottom of the inner container, positioning of the inner container is achieved through radial close fit, a moving space is formed through an axial gap, and a heat bridge is blocked while deformation is adapted. The lining film and the end socket are welded and sealed, and the outer shell is supported through inflation to be laid and formed in the manufacturing process. The structure synergistically improves the heat insulation performance and the light weight level of the storage tank, remarkably reduces the heat leakage rate and the overall weight, and is suitable for the fields of vehicle-mounted hydrogen storage and the like.

Description

Technical Field

[0001] This invention relates to the field of liquid hydrogen storage tank design and manufacturing, and particularly to a lightweight liquid hydrogen storage tank and its manufacturing method. Background Technology

[0002] With societal development, fossil fuels such as coal, oil, and natural gas can no longer meet humanity's ever-growing needs. Furthermore, the use of fossil fuels has led to ecological degradation, such as the greenhouse effect. In addition, coal, oil, and natural gas are non-renewable resources with limited reserves on Earth, making it impossible for humanity to rely on them indefinitely. Hydrogen energy, as a clean and efficient secondary energy source, is considered an ideal alternative to traditional fossil fuels. In hydrogen energy systems, the safe storage of hydrogen is the most critical aspect. Cryogenic liquid hydrogen storage, as an important hydrogen storage method, possesses advantages such as high energy density, large hydrogen carrying capacity, and safety and reliability, and has thus experienced rapid development.

[0003] Currently, liquid hydrogen storage tanks are the core component of liquid hydrogen storage and transportation systems. Liquid hydrogen storage tanks require a double- or multi-layered structure, with an insulation layer formed by insulating material between the innermost inner liner and the outermost outer shell. Since the temperature range of hydrogen's saturated vapor curve is from -259°C to -240°C, and liquid hydrogen is stored at around -253°C, maintaining hydrogen in a liquid or gas-liquid two-phase saturated state requires a pressure of one atmosphere. When external heat inflow causes the hydrogen temperature to rise to -240°C, the saturated atmospheric pressure of hydrogen is approximately 12.8 atmospheres, and the pressure inside the container will correspondingly increase to 12.8 atmospheres. If the temperature inside the container continues to rise above -240°C, even with increased pressure, the hydrogen will completely transform into a gaseous or supercritical state. The normal operating temperature range for liquid hydrogen storage is -253°C to -240°C, with a corresponding pressure range of 1 to 12.8 atmospheres.

[0004] In existing technologies, liquid hydrogen storage tanks include an outer shell, an inner liner, and a supporting structure. The outer shell has a head, one end of the supporting structure is connected to the head, and the other end of the supporting structure is connected to the inner liner, thus supporting the inner liner. However, this design results in poor thermal insulation due to the low temperature of the inner liner and the fact that all components are made of metal. The external environment and the liquid hydrogen inside the tank can directly exchange heat through the supporting structure and the head, increasing heat leakage. Furthermore, existing liquid hydrogen storage tanks use an all-metal body. To extend the heat conduction path and achieve better insulation, the inner liner often uses a folded neck tube with a liquid-blocking cover and a metal support plate at the rear end. This leads to poor weight control, an undesirable ratio of stored liquid hydrogen to the tank's mass, and increased transportation costs. The structure of liquid hydrogen storage containers needs to ensure good thermal insulation performance and also needs to meet the structural strength and rigidity requirements of industry or national standards for specific application scenarios. Based on this, lightweight storage tanks have become a key research direction in the industry. The shell structure design and vacuum insulation structure of hydrogen storage containers are the main technical means to ensure the safety and thermal insulation performance of hydrogen storage containers. Although liquid hydrogen storage equipment is widely used, the tank structure is mainly made of austenitic alloy steel, making the containers relatively heavy. In recent years, with the gradual application of cryogenic liquid hydrogen storage containers in the vehicle field, how to design lightweight structures for liquid hydrogen storage containers has become a key technology that needs to be mastered. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a lightweight liquid hydrogen storage tank and its manufacturing method, which optimizes the tank shell structure based on vacuum insulation to achieve a lightweight structural design for the liquid hydrogen storage tank.

[0006] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0007] A lightweight liquid hydrogen storage tank, comprising:

[0008] The inner liner is used to store liquid hydrogen;

[0009] An insulation layer is formed by covering the outer surface of the inner liner.

[0010] An inner lining membrane is disposed outside the insulation layer and forms a vacuum interlayer with the inner liner.

[0011] The outer shell is laid and cured onto the outer surface of the inner lining membrane;

[0012] The upper and lower end caps are respectively connected to both ends of the outer shell, and the ends of the inner lining membrane are respectively sealed to the upper and lower end caps;

[0013] The bellows, one end of which is connected to the upper end cap, serves as a support connecting the inner liner and the upper end cap;

[0014] The bottle stopper is attached to the top of the inner liner and connected to the other end of the bellows.

[0015] An insulating positioning ring is sandwiched between the lower end cap and the bottom of the inner liner;

[0016] The bottom of the inner liner and the heat insulation positioning ring form an axial sliding pair, and an axial gap is provided between the bottom end face of the inner liner and the bearing surface of the heat insulation positioning ring, so that the inner liner can slide axially relative to the lower end cap in a low temperature environment.

[0017] Furthermore, the heat-insulating positioning ring and the bottom of the inner liner form a nested axial sliding pair, and the axial gap between the bottom end face of the inner liner and the bearing surface of the heat-insulating positioning ring is ≤0.5mm, so that the inner liner can slide axially relative to the heat-insulating positioning ring, which is used to enable the inner liner to adaptively shrink and deform axially in different low temperature environments.

[0018] Furthermore, the inner liner is a thin-walled structure integrally formed from aluminum alloy.

[0019] Furthermore, the outer shell is a carbon fiber composite material shell, and the inner lining membrane is made of 304L stainless steel.

[0020] Furthermore, the heat-insulating positioning ring is nested inside the top of the lower end cap, and its material is epoxy fiberglass.

[0021] Furthermore, the contact surface between the heat-insulating positioning ring and the bottom of the inner liner is coated with polytetrafluoroethylene (PTFE). The PTFE coating has a coefficient of friction ≤0.1, which is used to achieve low-temperature non-destructive sliding.

[0022] A method for manufacturing the lightweight liquid hydrogen storage tank includes the following steps:

[0023] An insulation layer is wrapped around the inner liner; the insulation positioning ring is nested inside the top of the lower end cap, the bottom of the inner liner is engaged with the insulation positioning ring, and an axial gap is maintained; the bottle stopper is connected to the top of the inner liner, one end of the bellows is welded to the bottle stopper, and the other end of the bellows is welded to the upper end cap.

[0024] The inner liner membrane is welded to the upper and lower end caps to form a sealed cavity; the inner liner covered with the heat insulation layer is located inside the sealed cavity.

[0025] Gas with a pressure greater than 1 MPa is injected into the sealed cavity through a pipe installed on the lower end cap to support the inner liner membrane. Under this inflated and supported state, the composite material is laid onto the outer surface of the inner liner membrane and cured to form the outer shell. Gas is then evacuated from the sealed cavity through a pipe installed on the lower end cap to reduce the vacuum level to less than 10 kJ / m³. - 2MPa, at which point the inner lining membrane deforms inward under external air pressure and adheres to the insulation layer.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. The lightweight liquid hydrogen storage tank of the present invention achieves the core effect of significantly reducing the overall weight of the storage tank while ensuring structural strength and pressure resistance by adopting a combination structure of an outer shell made of carbon fiber composite material and a metal inner liner membrane, instead of the traditional all-metal outer shell. At the same time, the inner liner membrane ensures the airtightness of the vacuum interlayer.

[0028] 2. The lightweight liquid hydrogen storage tank of the present invention achieves the effect of minimizing the transfer of convective and conductive heat by setting a vacuum environment between the inner liner and the inner lining membrane and constructing an insulation barrier formed by the insulation layer, thereby effectively reducing the heat leakage rate of the storage tank and suppressing the evaporation and boiling of liquid hydrogen.

[0029] 3. The lightweight liquid hydrogen storage tank of the present invention extends the heat conduction path at the connection point by using a corrugated pipe to connect the upper end cap and the inner liner at the top of the tank, thereby weakening the "thermal bridge" effect. It also utilizes the axial expansion and contraction of the corrugated pipe itself to adaptively compensate for the axial contraction deformation of the inner liner at deep cryogenic temperatures, thus avoiding structural stress concentration.

[0030] 4. The lightweight liquid hydrogen storage tank of the present invention can form an axial sliding pair with the inner hole of the thermal insulation positioning ring through the outer cylindrical surface of the bottom of the inner liner, and an axial gap is provided between the bottom end face of the inner liner and the bearing step surface of the thermal insulation positioning ring. In this way, on the one hand, the thermal insulation positioning ring itself blocks the metal thermal bridge through the bottom; on the other hand, this structure allows the inner liner to slide freely axially at low temperature, which not only accurately positions the inner liner, but also completely eliminates the risk of structural damage caused by restricted shrinkage.

[0031] 5. The manufacturing method of the lightweight liquid hydrogen storage tank of the present invention employs a unique manufacturing approach: after welding the inner liner membrane and the end cap to form a sealed cavity, high-pressure gas is first injected for support, then a solidified composite material outer shell is laid on, and finally a vacuum is drawn. This ensures that during the manufacturing stage, the high-pressure gas provides stable inner mold support for the molding of the outer shell, guaranteeing molding quality; and during the finished product stage, the atmospheric pressure after vacuuming ensures that the inner liner membrane reliably adheres to the insulation layer, preventing the outer shell from becoming unstable and collapsing under negative pressure, thus improving product reliability.

[0032] 6. The lightweight liquid hydrogen storage tank of the present invention uses a polytetrafluoroethylene coating on the sliding surface of the heat insulation positioning ring to further reduce radiative heat leakage, ensure smooth sliding without wear in low-temperature environments, and thus comprehensively improve the long-term working stability of the storage tank.

[0033] 7. The lightweight liquid hydrogen storage tank of this invention uses an inner liner membrane in a vacuum environment between the inner tank and the outer shell. This prevents gas leakage, supports the outer shell during installation, and prevents inward deformation of the outer shell during gas extraction. The combination of the inner liner membrane and the outer shell replaces the traditional all-metal shell structure, significantly reducing the weight of the storage tank.

[0034] 8. The lightweight liquid hydrogen storage tank of the present invention reduces the weight of the hydrogen storage bottle while improving the thermal insulation performance of the liquid hydrogen storage tank, reducing the heat flow into the hydrogen storage bottle and causing the stored liquid hydrogen to heat up and evaporate. Based on vacuum insulation, the container shell structure is optimized to achieve a lightweight design of liquid hydrogen storage container. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a cross-sectional view of the lightweight liquid hydrogen storage tank described in this invention.

[0037] Figure 2 This is an explosion diagram of the lightweight liquid hydrogen storage tank of the present invention.

[0038] In the picture:

[0039] 1-Inner liner; 2-Insulation layer; 3-Inner lining membrane; 4-Outer shell; 5-Upper end cap; 6-Belling pipe; 7-Bottle stopper; 8-Insulation positioning ring; 9-Lower end cap. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] like Figure 1 and Figure 2 As shown, the lightweight liquid hydrogen storage tank of the present invention includes an inner liner 1, an insulation layer 2, an inner lining membrane 3, an outer shell 4, an upper end cap 5, a bellows 6, a stopper 7, an insulation positioning ring 8, and a lower end cap 9. All components are arranged coaxially to ensure uniform distribution of stress and thermal field.

[0044] In this embodiment, the inner liner 1 is a container for holding liquid hydrogen at -253°C, and is generally made of aluminum alloy material and integrally formed into a thin-walled structure using spinning technology. Its shape has been optimized, and the arc-shaped end caps at both ends adopt an isotensile curve design, which makes the stress distribution within the wall more uniform under internal pressure, thereby achieving further reduction in wall thickness while ensuring strength.

[0045] On the outer surface of the inner liner 1, a heat insulation layer 2, matching its shape, is tightly wrapped. The heat insulation layer 2 is a heat insulation barrier layer, typically composed of multilayer insulation material (MLI) or a high-performance vacuum insulation panel. The inner liner 1 and the inner lining membrane 3 together form a vacuum environment with a vacuum degree of <10⁻² MPa. The direct effect of this design is that the heat insulation layer 2, working synergistically with the vacuum environment, can minimize the heat flow caused by gas molecule convection and conduction, fundamentally reducing heat leakage from the environment to liquid hydrogen.

[0046] The upper end cap 5 and the upper end of the bellows 6 are sealed together by welding; the lower end of the bellows 6 is welded to a stopper 7; the stopper 7 is fixed to the top opening of the inner liner 1 by first threading and then welding for reinforcement. This design abandons the traditional thick-walled straight pipe connection scheme, and utilizes the meandering pipe wall path of the bellows 6 to significantly extend the heat conduction path from the room temperature end (upper end cap 5) to the low temperature end (inner liner 1), effectively reducing heat conduction and leakage at this point. In addition, the bellows 6 has excellent axial expansion and contraction capacity. When the inner liner 1 undergoes significant low-temperature contraction after liquid hydrogen is injected, the bellows 6 can freely expand and contract, thereby absorbing and compensating for axial displacement. This avoids the huge thermal stress generated under rigid constraints, prevents structural damage, and improves the durability and safety of the storage tank. The cavity inside the bellows 6 and the upper end cap 5 constitutes an integrated space for liquid hydrogen filling and discharge pipelines, optimizing the overall layout.

[0047] This invention introduces an insulating positioning ring 8 at the bottom of the liquid hydrogen storage tank to replace the traditional metal support plate at the bottom of the tank. An insulating positioning ring 8 is installed between the bottom of the lower end cap 9 and the bottom of the inner liner 1. The insulating positioning ring 8 is nested inside the top of the lower end cap 9, and its shape precisely matches the lower end cap 9 and the bottom of the inner liner 1. It is made of epoxy fiberglass with extremely low thermal conductivity, which can support the bottom of the inner liner 1 while preventing thermal bridging. A small clearance fit is used between the inner hole of the insulating positioning ring 8 and the outer cylindrical surface of the bottom of the inner liner 1. This fit ensures that the inner liner 1 is radially positioned. With the small clearance fit, the outer cylindrical surface of the bottom of the inner liner 1 can form an axial sliding pair with the inner hole of the insulating positioning ring 8; the small clearance fit is a clearance fit with a tolerance of 6-8 grades under the hole-basis system.

[0048] An axial gap, typically ≤0.5mm, is provided between the bottom end face of the inner liner 1 and the bearing step surface of the thermal insulation positioning ring 8. This axial gap design allows the inner liner 1 to undergo axial displacement relative to the thermal insulation positioning ring 8 and the lower end cap 9 during deep cryogenic contraction. This accommodates the thermal expansion and contraction characteristics of the materials, thereby reducing or eliminating the destructive force caused by axial deformation and improving the safety and service life of the storage tank under thermal cycling conditions. The thermal insulation positioning ring 8 itself is made of epoxy fiberglass, a low thermal conductivity material, which effectively blocks the "thermal bridge" formed through the bottom support structure, further ensuring the overall insulation performance of the tank from a material perspective.

[0049] In addition, the internal space of the lower end cap 9 has pipelines for integrated vacuuming and gas filling, which facilitates gas handling and vacuum monitoring of the vacuum interlayer during manufacturing and maintenance.

[0050] This invention addresses the problems of severe heat leakage and excessive mass in liquid hydrogen storage tanks with two-end supports. It utilizes bellows 6 and thermally insulating positioning rings 8 at the two-end supports of the liquid hydrogen storage tank. The bellows 6 freely expands and contracts, absorbing and compensating for axial displacement. Simultaneously, the bottom of the inner liner 1 can slide axially. This not only significantly reduces heat intrusion into these two critical areas but also improves the overall insulation performance of the tank, reducing liquid hydrogen evaporation loss. Furthermore, by eliminating thermal stress and optimizing the structure, a lightweight design for the liquid hydrogen storage tank is achieved.

[0051] The present invention provides a method for manufacturing the lightweight liquid hydrogen storage tank, comprising the following steps:

[0052] An insulation layer 2 is wrapped around the inner liner 1; the insulation positioning ring 8 is nested inside the top of the lower end cap 9, the bottom of the inner liner 1 is axially slidably engaged with the insulation positioning ring 8, and an axial gap is maintained between the bottom of the inner liner 1 and the insulation positioning ring 8; the bottle stopper 7 is connected to the top of the inner liner 1, one end of the bellows 6 is welded to the bottle stopper 7, and the other end of the bellows 6 is welded to the upper end cap 5;

[0053] The inner liner 3 serves as an airtight layer, and its material is preferably 304L stainless steel, which possesses excellent low-temperature toughness and weldability. It is formed into a capsule shape through a cold rolling process, and the inner liner 3 is welded to the upper end cap 5 and the lower end cap 9 to form a sealed cavity; the inner liner 1 covering the heat insulation layer 2 is located within the sealed cavity;

[0054] Gas with a pressure greater than 1 MPa is injected into the sealed cavity through a pipe installed on the lower end cap 9 to support the inner liner membrane 3; the gas is generally nitrogen. In the gas-supported state, the inner liner membrane 3 is supported from the inside by the gas pressure, and carbon fiber / resin prepreg (in the form of prepreg tape or prepreg fabric) is laid layer by layer on the outer surface of the inner liner membrane 3 by an automatic tape laying machine or manually, and cured to form the outer shell 4 of high-strength, lightweight composite material;

[0055] After the outer shell 4 has cured and formed and has sufficient strength, the gas in the sealed cavity is evacuated through the pipe on the lower end cap 9 to make its vacuum level less than 10. -2 At MPa, when gas is extracted, the inner liner membrane 3 is subjected to inward pressure and undergoes inward deformation, which will adhere to the outer surface of the insulation layer 2, preventing the outer shell 4 from collapsing due to the internal load during gas extraction.

[0056] In this embodiment, when selecting the material for the inner liner 3, 304L stainless steel was chosen based on the temperature distribution and the material's lower operating limit under low-temperature conditions. 304L stainless steel possesses excellent low-temperature performance. Furthermore, using 304L stainless steel allows the inner liner 3 to be better connected to the upper and lower end caps 5 and 9, which are made of the same material, via welding, resulting in excellent airtightness and effectively maintaining the vacuum state of the enclosed space. The combination of the inner liner 3 and the outer shell 4 replaces the traditional all-metal shell structure, significantly reducing the weight of the storage tank. The inner liner 3 is formed using a cold-rolling process. After being placed in the appropriate position, it is welded to the upper and lower end caps 5 and 9 using laser or thermal welding, thus achieving the forming and assembly of the sealed shell.

[0057] Liquid hydrogen storage containers typically also have a variety of complex internal and external systems, including support suspensions, hydrogen filling and discharging pipelines, pressure reducing and pressurizing valves, vacuum control systems, cooling systems, and temperature and pressure monitoring systems. These can be referenced from the design of existing metal liquid hydrogen storage tanks, and will not be described in detail here.

[0058] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0059] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lightweight liquid hydrogen storage tank characterized by, The application relates to a liquid hydrogen storage tank, which comprises the following components: an inner container (1) for storing liquid hydrogen; an adiabatic layer (2) covering the outer surface of the inner container (1); an inner lining film (3) arranged outside the adiabatic layer (2) and surrounding a vacuum interlayer with the inner container (1); an outer shell (4) attached to the outer surface of the inner lining film (3); an upper end cover (5) and a lower end cover (9) connected to the two ends of the outer shell (4) respectively, and the end of the inner lining film (3) is sealingly connected to the upper end cover (5) and the lower end cover (9) respectively; a bellows (6) with one end connected to the upper end cover (5) and serving as a supporting piece connecting the inner container (1) and the upper end cover (5); a bottle plug (7) connected to the top end of the inner container (1) and connected to the other end of the bellows (6); and an adiabatic positioning ring (8) clamped between the bottom of the inner container (1) and the lower end cover (9). The bottom of the inner container (1) and the adiabatic positioning ring (8) form an axial sliding pair, and an axial gap is arranged between the end surface of the bottom of the inner container (1) and the bearing surface of the adiabatic positioning ring (8) to enable the inner container (1) to axially slide relative to the lower end cover (9) in a low-temperature environment. The adiabatic positioning ring (8) and the bottom of the inner container (1) form a nested axial sliding pair, and the axial gap between the end surface of the bottom of the inner container (1) and the bearing surface of the adiabatic positioning ring (8) is less than or equal to 0.5 mm, so that the inner container (1) can axially slide relative to the adiabatic positioning ring (8) and adaptively axially contract in different low-temperature environments. The inner container (1) is an aluminum alloy integrally formed thin-walled structure. The outer shell (4) is a carbon fiber composite material shell, and the inner lining film (3) is made of 304L stainless steel. The adiabatic positioning ring (8) is nested in the top end of the lower end cover (9) and is made of epoxy glass steel. The contact surface of the adiabatic positioning ring (8) and the bottom of the inner container (1) is provided with a polytetrafluoroethylene coating with a friction coefficient less than or equal to 0.1, so as to realize low-temperature lossless sliding. The application further discloses a liquid hydrogen storage tank manufacturing method, which comprises the following steps: coating the inner container (1) with the adiabatic layer (2); nesting the adiabatic positioning ring (8) in the top end of the lower end cover (9), and matching the bottom of the inner container (1) with the adiabatic positioning ring (8) to keep an axial gap; connecting the bottle plug (7) to the top end of the inner container (1), welding one end of the bellows (6) to the bottle plug (7), and welding the other end of the bellows (6) to the upper end cover (5); welding the inner lining film (3) to the upper end cover (5) and the lower end cover (9) to form a sealed cavity, and arranging the inner container (1) coated with the adiabatic layer (2) in the sealed cavity. ​ ​ 2. The light-weight liquid hydrogen storage tank according to claim 1, characterized by, ​ 3. The light-weight liquid hydrogen storage tank according to claim 1, characterized by, ​ 4. The light-weight liquid hydrogen storage tank according to claim 1, characterized by, ​ 5. The light-weight liquid hydrogen storage tank according to claim 1, characterized by, ​ 6. The lightweight liquid hydrogen storage tank according to claim 1, wherein ​ 7. A method for manufacturing the light-weight liquid hydrogen storage tank according to any one of claims 1 to 7, characterized by, ​ ​ ​ By setting pipeline on the lower head (9), the gas with pressure greater than 1MPa is filled into the sealed cavity to support the inner lining film (3); in the state of gas support, the composite material is laid on the outer surface of the inner lining film (3) and solidified to form the outer shell (4); the gas in the sealed cavity is removed through the pipeline on the lower head (9) so that the vacuum degree is less than 10 -2 MPa, at this time, the inner lining film (3) deforms inwardly under the external air pressure and adheres to the heat insulation layer (2).

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