CN112963723A - Manufacturing method of heating assembly for inner container of pressure gas storage container and pressure gas storage container - Google Patents
Manufacturing method of heating assembly for inner container of pressure gas storage container and pressure gas storage container Download PDFInfo
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- CN112963723A CN112963723A CN202110260489.6A CN202110260489A CN112963723A CN 112963723 A CN112963723 A CN 112963723A CN 202110260489 A CN202110260489 A CN 202110260489A CN 112963723 A CN112963723 A CN 112963723A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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Abstract
The application belongs to the technical field of pressure gas storage devices, and particularly relates to a manufacturing method of a heating assembly for an inner container of a pressure gas storage container and the pressure gas storage container. The application provides a manufacturing method for a heating assembly of a pressure air storage container inner container, which comprises the following steps: manufacturing a pressure gas storage container model with the same shape and size as the target pressure gas storage container; for the manufactured pressure gas storage container model, forming a carbon nano tube film heating element with the shape matched with the shape of the corresponding area of the pressure gas storage container model on the surface of the area to be prepared with the carbon nano tube film heating element; coating heat-conducting glue on an area, to be attached with a heating film, of a resin liner of the pressure gas storage container, then separating and moving the carbon nanotube film heating element from the pressure gas storage container model, paving the carbon nanotube film heating element on an area corresponding to the heat-conducting glue, and then curing the carbon nanotube film heating element. The method provided by the application can improve the fitting degree of the heating element between the resin liner and the carbon fiber.
Description
Technical Field
The application belongs to the technical field of pressure gas storage devices, and particularly relates to a manufacturing method of a heating assembly for an inner container of a pressure gas storage container and the pressure gas storage container.
Background
The hydrogen storage assembly is one of the core components of the fuel cell assembly and comprises a high-pressure hydrogen storage bottle, a safety valve, a pipeline and the like. The high-pressure hydrogen storage bottle is mainly used for storing high-pressure gaseous hydrogen, and the working state and the health condition of the high-pressure hydrogen storage bottle determine the safety and the service life of the whole fuel cell vehicle. The four-type high-pressure hydrogen storage bottle with the plastic inner container and the carbon fiber wound completely is widely expected in the market due to the advantages of light weight, high gas storage density, easier molding compared with a metal inner container and the like. At present, the four-type high-pressure hydrogen storage bottle is mainly applied to fuel cell passenger vehicles sensitive to weight.
Plastics shrink in a low-temperature environment, and when the temperature is lower than the glass transition temperature of the material, embrittlement phenomenon occurs, namely, the breaking elongation is greatly reduced due to the increase of strength. For example, the breaking elongation of the nylon material at normal temperature is 30-100%, but is reduced to below 6% at-70 ℃. The change of the performance of the plastic at low temperature can cause that the plastic liner of the four-type high-pressure hydrogen storage bottle can not be fully attached to the carbon fiber pressure-resistant layer, so that the local stress concentration is caused, and the risk of the hydrogen leakage caused by the failure of the material is increased; in addition, the fatigue strength of the plastic liner is reduced. Particularly, in the portion where the resin liner is connected to the valve seat of the metal cylinder, the reduction in fatigue strength of this portion greatly increases the risk of leakage of high-pressure hydrogen gas. In order to improve the service performance of the plastic liner, a novel liner material can be developed to improve the material characteristics of the liner material. However, this method is expensive and long in cycle time, and cannot solve the problems of shrinkage and poor performance of the resin material at low temperatures.
Disclosure of Invention
Problems to be solved by the invention
An object of the application is to provide a manufacturing method of a heating component for a liner of a pressure gas storage container and the pressure gas storage container, and the problem that a carbon fiber pressure-resistant layer cannot be sufficiently attached to a plastic liner of an existing four-type high-pressure hydrogen storage bottle is solved.
Means for solving the problems
In order to achieve the above purpose, the technical solution adopted by the present application is as follows:
in a first aspect, the present application provides a method for manufacturing a heating assembly for an inner container of a pressure gas storage container, comprising the following steps:
manufacturing a pressure gas storage container model with the same shape and size as the target pressure gas storage container;
for the manufactured pressure gas storage container model, forming a carbon nano tube film heating element with the shape matched with the shape of the corresponding area of the pressure gas storage container model on the surface of the area to be prepared with the carbon nano tube film heating element;
coating heat-conducting glue on an area of a resin inner container of the pressure gas storage container, to which a heating film is to be attached, separating and moving the carbon nanotube film heating element from the pressure gas storage container model, paving the carbon nanotube film heating element in an area corresponding to the heat-conducting glue, and then curing the carbon nanotube film heating element.
Preferably, in the step of manufacturing the carbon nanotube heating thin film heating element:
preparing an annular carbon nanotube prefabricated film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared;
and cutting the annular carbon nanotube prefabricated film, arranging an insulating layer at the notch part formed by cutting, and arranging conducting wires on the two cut surfaces formed by cutting to finally obtain the carbon nanotube film heating element.
Preferably, the method for preparing the annular carbon nanotube prefabricated film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared comprises the following steps: and winding a carbon nanotube array film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared, so as to obtain the annular carbon nanotube prefabricated film.
Preferably, in the step of winding the carbon nanotube array film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared, the number of winding layers of the carbon nanotube array film is 50-200.
Preferably, before the step of cutting the ring-shaped carbon nanotube prefabricated film, the method further includes: and carrying out pretreatment and densification treatment on the cut carbon nanotube array film.
Preferably, the thermally conductive paste includes an epoxy resin, and the pretreatment includes an epoxidation treatment.
Preferably, the thickness of the carbon nanotube heating film is 5-20 microns.
Preferably, the two cut surfaces formed by cutting are provided with conducting wires, and the method comprises the following steps:
and coating conductive slurry on the two cut surfaces formed by cutting, attaching the lead to the surfaces of the cut surfaces, compacting and curing.
Preferably, the wire is a carbon nanotube fiber wire.
A second aspect of the present application provides a pressure gas storage container comprising:
a pressure gas storage container body;
the carbon fiber layer is wound on the surface of the pressure air storage container body and used for reinforcing;
the carbon nanotube film heating assembly prepared by the method of the first aspect.
Preferably, the pressure gas storage container further comprises a temperature sensor, and the temperature difference sensor is electrically connected with the carbon nanotube film heating assembly.
Preferably, the carbon nanotube film heating assembly is disposed at the head sealing section of the container body.
Effects of the invention
The application provides a manufacturing method for heating element for inner bag of pressure gas storage container, prepares carbon nanotube film heating element on the resin inner bag surface of pressure gas storage container, can effective control carbon nanotube film heating element's thickness, improves heating element's compliance, and then improves heating element's laminating degree between resin inner bag and carbon fiber, and is very special, and carbon nanotube film heating element can overcome heating element can not effectively laminate in the curved surface problem. In addition, the carbon nanotube fiber has excellent mechanical properties, such as high modulus, high tensile limit and the like, can increase the shape stability of the heating component, is favorable for winding the carbon fiber on the surface of the resin liner when winding the carbon fiber, and avoids damage to the heating component due to the tension of the winding belt.
The application provides a pressure gas storage container sets up carbon nanotube heating film heating element, not only can improve the laminating degree of resin inner bag and carbon fiber, does not influence carbon fiber moreover and spreads the layer and whole hydrogen storage container's intensity and durability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a pressurized gas storage container according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a carbon nanotube pre-fabricated film obtained after cutting according to an embodiment of the present application after spreading and tiling;
fig. 3 is a schematic structural view of a high-pressure hydrogen storage cylinder provided in an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or multiple, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In the development and design of the high-pressure hydrogen storage bottle with the plastic liner, the problem of low-temperature performance of the liner material is generally solved by developing a novel liner material. However, this method is expensive and long in cycle time, and cannot solve the problems of shrinkage and low performance of the resin material at low temperature. In order to improve the service performance of the plastic liner, besides improving the material characteristics of the liner material to adapt to the working environment, another feasible method is to actively adjust the temperature of the hydrogen storage bottle to ensure that the resin liner material works in a proper temperature environment, thereby ensuring the safety performance of the high-pressure hydrogen storage bottle and improving the durability of the high-pressure hydrogen storage bottle. But no resin liner hydrogen storage bottle adopts the practical application of relevant design at present.
The purpose of adjusting the temperature of the hydrogen storage bottle can be achieved by embedding the heating component between the carbon fiber laying layer and the resin inner container, but whether the embedded heating component can be well attached to the surface of the resin inner container of the container or not needs to be considered in the method, and the strength and the durability of the carbon fiber laying layer and the whole hydrogen storage container cannot be affected. The current heating means (such as metal heating wires, carbon heating wires and the like) have the following problems: first, the thickness and flexibility of the metal heating element are difficult to meet the practical application requirements of the plastic liner hydrogen storage bottle for passenger vehicles. Too thick heating element, laminating inner bag and carbon fiber that can not be abundant shop, and arbitrary one deck of inner bag and carbon fiber shop layer can not effectively laminate and all can reduce inner bag material fatigue strength because of local stress concentration to increase the risk that high-pressure hydrogen leaked. Secondly, too large a diameter of the wire connecting the heating element to the control element or to the power supply also causes local stress concentrations, reducing the fatigue strength of the container. Thirdly, hydrogen is a flammable and explosive gas, so that the requirement on safety is high. The heating wire of the alloy material is usually high in driving voltage, so that the danger of open fire is generated, and the heating wire is a great safety hazard for the high-pressure hydrogen storage container. Fourthly, if the heating wire or the heating film is attached to the surface of the carbon fiber pressure-resistant layer of the hydrogen storage bottle, on one hand, the generated heat can be dissipated into the air, so that energy waste is caused; on the other hand, the heat cannot sufficiently heat the liner plastic due to the low thermal conductivity of the carbon fiber pressure-resistant layer.
In a macroscopic body, the carbon nanotubes are gathered into bundles by van der waals force or by a re-bonding mode through dangling bonds on the tube wall, and the carbon nanotubes have the characteristics of excellent conductivity, high specific strength, high chemical stability at high temperature, difficulty in deformation and the like. The film prepared by using the carbon nanotube fiber as the raw material has the characteristics of thin thickness, flexibility, free bending, rapid temperature rise under low current, good heating stability and the like. Therefore, the heating film made of the carbon nanotube film is expected to be used as a heating component in a pressure gas storage container. In view of this, it is preferable that,
in a first aspect, an embodiment of the present application provides a method for manufacturing a heating assembly for an inner container of a pressure air container, including the following steps:
s01, manufacturing a pressure gas storage container model with the same shape and size as the target pressure gas storage container;
s02, forming a carbon nano tube film heating element with the shape matched with that of the corresponding area of the pressure gas storage container model on the surface of the area of the manufactured pressure gas storage container model where the carbon nano tube film heating element is to be prepared;
s03, coating heat-conducting glue on an area, to be attached with a heating film, of a resin liner of the pressure gas storage container, separating and moving the carbon nanotube film heating element from the pressure gas storage container model, paving the carbon nanotube film heating element on an area corresponding to the heat-conducting glue, and then curing the carbon nanotube film heating element.
According to the manufacturing method of the heating assembly for the inner container of the pressure gas storage container, the carbon nanotube film heating assembly is prepared on the surface of the resin inner container of the pressure gas storage container, the thickness of the carbon nanotube film heating assembly can be effectively controlled, the flexibility of the heating assembly is improved, the attaching degree of the heating assembly between the resin inner container and carbon fibers is further improved, and particularly, the problem that the heating assembly cannot be effectively attached to the surface of a curved surface can be solved through the carbon nanotube film heating assembly. In addition, the carbon nanotube fiber has excellent mechanical properties, such as high modulus, high tensile limit and the like, can increase the shape stability of the heating component, is favorable for winding the carbon fiber on the surface of the resin liner when winding the carbon fiber, and avoids damage to the heating component due to the tension of the winding belt.
The pressure gas storage container that this application embodiment provided indicates the gas holder that can store high-pressure gas. The pressure gas storage container is usually a high-pressure metal tank, and the gas storage pressure is 0.8-2 MPa or even higher. It should be noted that the material of the air storage tank may be a metal material, but is not limited to the metal material. In some embodiments, the pressure gas storage vessel is a high pressure hydrogen storage cylinder.
In some embodiments, as shown in fig. 1, the pressurized air container is divided into, from the bottom up: the bottle comprises a bottle body part 1, a head sealing section 2 and a bottle mouth valve seat 3, wherein a, b and c respectively represent a combination line (equator) of the head sealing section 2 and the bottle body part 1, a starting line of one end of a resin liner, and a combination line of the head sealing section 2 and the bottle mouth valve seat 3. Wherein, the bottle body part 1 is a main cavity part for accommodating gas, in some embodiments, the bottle body part 1 is a straight cylinder bottle body; the head sealing section 2 is gradually reduced in radial size from the bottle body part 1 to the bottle mouth valve seat 3; a mouth valve seat 3 is incorporated at the end of the closing head section 2 of smaller radial dimension for engaging the closure member. The line of juncture of the closing head segment 2 and the spout valve seat 3 is called the equator. The shape of the head segment 2 is not critical, and in some embodiments, the shape of the head segment 2 is hemispherical, semi-elliptical, or butterfly.
In some embodiments, at least a portion of the head sealing section 2 of the air container is made of resin. The area of the sealing section 2 provided with the resin liner at least comprises a cylinder area which is close to the bottle body part 1 and changes in the radial direction. In some embodiments, the head sealing section 2 of the air-pressure container is made of a resin material, and constitutes a resin inner container.
Specifically, in step S01, the pressure gas container model is a complete model corresponding to the shape and size of the target pressure gas container, and in the embodiment of the present application, the carbon nanotube film heating element is first prepared on the local surface of the pressure gas container model.
In some embodiments, the model of the barovessel is made of pulp that has the same shape and size as the target barovessel. Wherein, the paper pulp can adopt paper pulp such as glassine paper, kraft liner paper or double-sided offset paper and the like as release paper. In some embodiments, the surface of the prepared three-dimensional model of the head sealing section is coated with glassine paper, kraft paper or double-sided offset paper, so that the carbon nanotube fibers can be conveniently wound on the surface of the prepared three-dimensional model.
In step S02, the embodiment of the present invention manufactures the carbon nanotube film heating element having a shape matching the corresponding area of the pressure container model by using the pressure container model.
In some embodiments, the carbon nanotube film heating element is disposed on the head sealing section of the pressure gas storage container, i.e., the carbon nanotube film heating element is prepared on the surface of the three-dimensional model of the head sealing section. In this case, a carbon nanotube film heating element is correspondingly prepared on the surface of the head sealing section of the model of the pressure gas storage container. In the embodiment, the internal stress distribution of the pressure gas storage container in the working state is fully considered, and the heating component, namely the carbon nanotube film heating element is embedded into the resin liner and the carbon fibers of the head sealing section which are the parts with small stress, so that the heating component is well fixed on the surface of the resin liner and is attached to the carbon fiber layer, and the strength of the whole pressure gas storage container is not influenced by the heating component.
Illustratively, the carbon nanotube film heating element is arranged at a position satisfying: the projected area of the container in the length direction completely covers the projected area of the part of the hydrogen storage bottle where the bottle mouth valve seat and the resin liner are combined, and if the resin liner extends to the inner surface of the bottle mouth of the hydrogen storage bottle valve seat, the carbon nanotube film needs to be close to the combination line of the bottle mouth and the sealing head section as much as possible, namely c in fig. 1.
In the step of manufacturing the carbon nanotube heating thin film heating element:
s021, preparing an annular carbon nanotube prefabricated film on the surface of an area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared.
In some embodiments, the method for preparing the annular carbon nanotube prefabricated film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared comprises the following steps: and winding the carbon nanotube array film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared to obtain the annular carbon nanotube prefabricated film. According to the embodiment, the annular carbon nanotube prefabricated film is prepared by winding the carbon nanotube array film, so that the softness of the film layer is favorably improved, the attaching degree of the carbon nanotube film heating element on the surface of the resin liner and between the resin liner and the carbon fibers is further improved, and the problem that an alloy or carbon wire heating wire cannot be effectively attached between the resin liner and the carbon fibers is solved. Particularly, when the surface to be bonded or the surface of the numerical value liner to be bonded is a curved surface, the bonding performance of the carbon nanotube film heating element on the surface of the resin liner and between the resin liner and the carbon fiber is improved more obviously.
In some embodiments, winding the carbon nanotube array film on the surface of the area of the model of the pressure gas storage container where the carbon nanotube film heating element is to be prepared includes: and pulling out the carbon nanotube film from the carbon nanotube array, and winding the carbon nanotube film along the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared to manufacture the annular carbon nanotube prefabricated film which is attached to the model.
The number of winding layers of the carbon nanotube array film not only affects the thickness of the carbon nanotube film, but also affects the surface density of the carbon nanotube film, and further affects the tensile strength of the film. In some embodiments, in the step of winding the carbon nanotube array film on the surface of the area of the pressure gas container model where the carbon nanotube film heating element is to be prepared, the number of winding layers of the carbon nanotube array film is 50-200. In this case, when the carbon nanotube film heating element is fixed on the surface of the resin liner by using the heat conductive adhesive in step S03, the heat conductive adhesive has a good wetting effect, and the mechanical property of the obtained composite structure of the resin liner, the carbon nanotube film heating element, and the carbon fiber reinforced layer increases with the increase of the content of the carbon nanotube. However, when the number of winding layers of the carbon nanotube array film exceeds 200, the inside of the carbon nanotube film cannot be sufficiently soaked by the heat conductive adhesive, and the mechanical properties are reduced. If the number of winding layers of the carbon nanotube array film is too low, for example, less than 50, when the carbon fiber winding is performed on the surface of the obtained carbon nanotube film heating element, the carbon fiber winding tape may damage the carbon nanotube film heating element. Illustratively, the number of winding layers of the carbon nanotube array film is 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200.
In some embodiments, the thickness of the prefabricated film of the cyclic carbon nanotubes is 5 to 20 μm. Under the condition, the content of the carbon nano tubes in the carbon nano tube film is proper, deformation energy can be dissipated in the crack propagation process, and the mechanical property of the pressure gas storage container is improved. However, the carbon nanotubes have too large a thickness, which causes stress concentration, thereby affecting fatigue strength of the entire container, increasing the risk of material failure, and thus easily causing gas leakage or even the risk of container failure. In addition, the excessively thick carbon nanotube film can affect the fixing effect of the adhesive on the carbon nanotube film, so that the mechanical strength of the composite structure of the pressure gas storage container body, the carbon nanotube film and the carbon fiber reinforced layer is reduced.
The winding width of the carbon nanotube array film corresponds to the setting width of the carbon nanotube film heating element, in some embodiments, the pressure gas storage container is a high-pressure hydrogen storage bottle, and the winding width of the carbon nanotube array film is 10-150 mm. For example, the winding width of the carbon nanotube array film may be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150 mm.
S022, cutting the annular carbon nanotube prefabricated film, arranging an insulating layer at a cut part formed by cutting, and arranging conducting wires on two cut surfaces formed by cutting to obtain the carbon nanotube film heating element.
Before cutting, the prefabricated film of the annular carbon nano tube surrounding the surface of the model is taken off from the surface of the model. In some embodiments, the ring-shaped carbon nanotube pre-film may be cut perpendicular to the winding direction by a blade or the like and removed from the surface of the mold.
In some embodiments, after the annular carbon nanotube pre-formed film is removed from the mold surface, the carbon nanotube pre-formed film is pre-treated and densified.
The pretreatment can be to carry out treatment on the carbon nano tube prefabricated film to be beneficial to attaching on the surface of the resin liner. In some embodiments, when the thermal conductive adhesive used to fix the carbon nanotube film heating element in step S03 includes epoxy resin (i.e., the carbon nanotube film heating element and the resin inner container of the pressure gas container are bonded and fixed by the epoxy resin thermal conductive adhesive), the corresponding pre-treatment includes an epoxidation treatment. Under the condition, the affinity between the carbon nanotube film heating element and epoxy resin can be increased through epoxidation treatment, the interface mechanical property and the heat conduction capability of the liner resin material and the carbon nanotube film heating element are improved, and the heating efficiency of carbon nanotube fibers on the pressure gas storage container is improved.
In some embodiments, the method for epoxidizing the carbon nanotube prefabricated film comprises the following steps: and placing the carbon nano tube prefabricated film in an epoxidation reagent or an epoxidation gaseous environment for epoxidation treatment. In some embodiments, the epoxidation agent comprises m-chloroperoxybenzoic acid (m-CPBA) or trichlorodimethyldioxirane, and the epoxidation gaseous environment may be an ozone environment. The epoxidation treatment is carried out by adopting the reagent, so that the damage to the structure of the carbon nano tube is small, the oxygen content of the carbon nano tube is high, and the improvement of the interface performance of the carbon nano tube fiber and the epoxy resin is facilitated. And (3) carrying out epoxidation treatment on the carbon nanotube array film, and then drying.
Illustratively, a method for epoxidizing a carbon nanotube pre-fabricated film comprises: placing the carbon nano tube array film in CH of m-chloroperoxybenzoic acid (m-CPBA) with the mass concentration of 1-3%2Cl2Dissolving in the solution for 30-45 min, or performing epoxidation treatment with ozone and trichloro-dimethyl-diepoxy ethane; then removing residual m-CPBA by using dichloromethane and ethanol; subsequently, the carbon nanotube array film was dried at 50 ℃ for 2 hours to remove the solvent. Wherein the mass concentration of CH of m-chloroperoxybenzoic acid (m-CPBA) is 1-3%2Cl2The solution may be replaced by ozone or trichlorodimethyldioxirane.
The carbon nano tube prefabricated film is densified, so that the compactness and the thickness uniformity of the obtained carbon nano tube film heating element are improved. In some embodiments, the carbon nanotube array film after the pretreatment is placed on the mold again, and the surface of the film is rolled by using a roller to perform densification treatment.
In the embodiment of the application, the annular carbon nanotube prefabricated film is cut to provide a space for arranging a lead. The cutting of the annular carbon nanotube prefabricated film can be synchronously realized in the process of taking the annular carbon nanotube prefabricated film off the model; or taking the annular carbon nanotube prefabricated film off the model, densifying and cutting. Preferably, the annular carbon nanotube prefabricated film is taken off from the model, and is subjected to pretreatment and densification treatment, and then is cut, so that the influence of the pretreatment and densification treatment on the cut shape is avoided when the pretreatment is carried out after cutting.
And cutting off the gap part formed between the annular carbon nanotube prefabricated films so as to arrange a lead electrically connected with the carbon nanotube film heating element. In some embodiments, a part of the carbon nanotube film is cut along two diameter directions of the annular carbon nanotube pre-film to form a gap portion, and two gap surfaces are correspondingly formed at the cut position. A schematic diagram of the carbon nanotube pre-film obtained after cutting and spreading is shown in fig. 2, where a is the cut annular carbon nanotube pre-film, B, C is two fracture surfaces (conductive side surfaces) respectively, and D is a gap portion formed between the two fracture surfaces.
In some embodiments, the distance between the two cut surfaces is 1-4 mm, and the distance is adjusted according to the size of the head sealing section of the pressure air container.
In some embodiments, as shown in fig. 2, an insulating layer D is disposed at the cut-out portion formed by cutting, and the two cut-out surfaces B, C are fixed, and the distance between the two cut-out surfaces B, C is fixed, so that when the carbon fiber winding is performed after the carbon nanotube film heating element is fixed on the surface of the resin liner, the two cut-out surfaces and the lead wires connected with the two cut-out surfaces will not be displaced, thereby improving the stability of the heating assembly of the pressure storage container.
In some embodiments, the thickness of the insulating layer is 50 to 200 μm, and if the thickness of the insulating layer is too large, the thickness of the obtained carbon nanotube film heating element is increased, a gap is formed between the resin liner and the carbon fiber layer, and the fatigue property of the pressure gas storage container is reduced. In some embodiments, the material of the insulating layer may be polyethylene terephthalate (PET) or Polyimide (PI). In some embodiments, the insulating layer is resin bonded to the fracture surface using an epoxy adhesive.
In some embodiments, the two cut surfaces formed by cutting are provided with conducting wires, and the conducting wires are used for connecting the temperature sensors of the pressure gas storage container, so that the temperature of the carbon nanotube film heating element can be adjusted.
In some embodiments, the step of providing wires on two fracture surfaces formed by cutting comprises the following steps: and coating conductive slurry on the two cut surfaces formed by cutting, attaching a lead on the surfaces of the cut surfaces, compacting and curing. The conductive slurry is used for fixing the lead on the surface of the fracture surface and electrically connected with the carbon nano tube prefabricated film.
In some embodiments, one or more conductive nanoparticles may be contained in the conductive paste, and for example, the conductive nanoparticles may be silver nanoparticles, copper nanoparticles, gold nanoparticles, or the like. In some embodiments, the metal nanoparticles have a diameter of 8 to 12 nm.
In some embodiments, when the conductive paste is coated on two cut surfaces formed by cutting, the coating width of the conductive paste is 1-5 mm, which can be adjusted according to practical operability. And coating the conductive slurry on the fracture surface, attaching the lead to the whole fracture surface, and compacting. In some embodiments, the carbon nanotube film heating element is obtained by compacting by rolling and then curing at room temperature to make the wires tightly connected to the fracture surface. The coating amount of the conductive paste cannot be excessive, in some embodiments, the coating thickness of the conductive paste is 40-50 μm, and the bonding strength between the wire and the carbon nanotube film heating element is reduced due to the excessively thick paste.
The wire can be a common wire. Since the diameter of the ordinary metal guide wire is large, the fatigue strength of the container is seriously affected, and leakage is possibly caused. Thus, in some embodiments, the wire is a carbon nanotube fiber wire. In this case, the carbon nanotube fiber bundle wire is used to connect the heating film and the power/control assembly, and the excellent mechanical properties and high conductivity of the carbon nanotube fiber reduce the diameter of the wire, thereby reducing the influence of the wire on the fatigue strength of the pressure gas storage container.
In some embodiments, the carbon nanotube fiber wire is a carbon nanotube fiber bundle with a diameter of 100 μm obtained by doubling 2-50 carbon nanotube fibers, and when the obtained pressure gas storage container containing the carbon nanotube heating component is used for a vehicle-mounted component, the pressure gas storage container can simultaneously meet the requirements of a vehicle-mounted direct current supply voltage and current (generally, the voltage is about 12v, and the current is about 0.5-2.4A), and the requirements of a carbon nanotube film heating element on the driving voltage and the current, and the influence of the wire on the fatigue strength of the whole container is also reduced.
In some embodiments, the thickness of the carbon nanotube film heating element is 5-20 μm. Under the condition, the thickness of the carbon nanotube film heating element is increased, and the content of the carbon nanotubes is correspondingly increased, so that more deformation energy is dissipated in the crack propagation process, and the mechanical property of the hydrogen storage bottle is improved. However, the excessive thickness of the carbon nanotube may affect the infiltration effect of the thermal conductive adhesive in the carbon nanotube film heating element, which may result in insufficient infiltration, thereby reducing the mechanical strength of the composite structure of the resin liner, the carbon nanotube film heating element, and the carbon fiber reinforced layer.
In step S03, a cleaning process is performed before the heat conductive adhesive is applied to the area of the resin inner container of the pressure air container to which the heating film is to be attached. The region to be attached with the heating film is as described above, such as the head sealing section of the high pressure hydrogen storage cylinder, and will not be described herein again.
And coating heat-conducting glue on the area of the resin liner to be attached with the heating film, wherein the heat-conducting glue mainly plays the roles of insulation, heat conduction and sealing. In some embodiments, the heat-conducting adhesive may be a thermosetting two-component potting adhesive, such as an epoxy potting adhesive, a polyurethane potting adhesive, or the like. The thickness of the thermally conductive paste takes into account the overall thickness of the carbon nanotube film heating element and the effect on fatigue strength of the hydrogen storage bottle, as well as operability, and in some embodiments, the thickness of the thermally conductive paste is less than or equal to 200 μm. If the thickness of the heat conducting glue exceeds 200 μm, the carbon nanotube film heating element is too thick, and a significant gap is formed between the carbon fiber layer and the resin liner. In the pressurized state, significant stress concentration zones are formed at the voids, which reduce the fatigue strength of the pressure gas storage vessel, such as a high pressure hydrogen storage cylinder. The heat-conducting glue comprises resin glue with heat-conducting property and can also be pouring glue.
The method comprises the steps of separating the carbon nanotube film heating element from the pressure gas storage container model and moving the carbon nanotube film heating element, and laying the carbon nanotube film heating element on the surface of the resin liner, wherein the step of separating the carbon nanotube film heating element from the pressure gas storage container model does not need to be carried out after the step of coating the area, to be attached with the heating film, of the resin liner of the pressure gas storage container with the heat-conducting glue, and the carbon nanotube film heating element can be separated from the pressure gas storage container model before the carbon nanotube film heating element is laid on the surface of the resin liner. Specifically, the carbon nanotube film heating element is laid in the area corresponding to the heat-conducting glue, and the carbon nanotube film heating element is adhered to the surface of the resin liner through the heat-conducting glue. In some embodiments, a blade coating method is used to scrape the carbon nanotube film heating element to make it fit as completely as possible on the inner wall surface of the container. In some embodiments, the final carbon nanotube heating element has a thickness of 100 to 500 μm.
Furthermore, the carbon nanotube film heating element is fixed on the surface of the resin inner container through curing treatment, so that the subsequent carbon fiber layering operation is not influenced.
In some embodiments, epoxy resin containing a curing agent is coated on the surface of the carbon nanotube film heating element, so that the interior of the carbon nanotube film heating element is fully soaked in the epoxy resin and is tightly attached to the surface of the container, and the lead is fixed at the end socket.
A second aspect of the present invention provides a pressure gas storage container, comprising:
a pressure gas storage container body;
the carbon fiber layer is wound on the surface of the pressure air storage container body and used for reinforcing;
the carbon nanotube film heating assembly is arranged between at least part of the inner surface of the pressure gas storage container body and the carbon fiber layer.
The embodiment of the application provides a pressure gas storage container, add between resin inner bag and carbon fiber and establish resin inner bag carbon nanotube film heating element as carbon nanotube heating element, not only can improve the laminating degree of resin inner bag and carbon fiber, do not influence the intensity and the durability that carbon fiber spread the layer and whole hydrogen storage container moreover.
Specifically, the container body refers to a basic housing for containing high-pressure gas, such as a stainless steel tank body of a high-pressure gas storage tank. The pressure air storage container based on the plastic liner fully-wound fiber is characterized in that the head sealing section of the container body is made of resin material, namely the head sealing section is made of the resin liner.
At least part of the inner surface of the pressure gas storage container body is provided with a carbon nano tube film heating component. The structure of the nanotube film heating element is as described above and will not be described herein for brevity. In some embodiments, a carbon nanotube heating assembly is attached to the inner surface of part or all of the resin liner. In some embodiments, the carbon nanotube heating element is a carbon nanotube thin film heating element prepared by the method of the first aspect, and the arrangement manner thereof may also be implemented by the method provided by the first aspect, which is not described herein again.
In some embodiments, as shown in fig. 3, the pressure gas storage container is a high pressure hydrogen storage bottle, the high pressure hydrogen storage bottle is divided into three parts, i.e., a straight body part 11, a head sealing section 21 and a bottle mouth valve seat 31, from bottom to top, a ', b ' and c ' respectively represent a joint line (equator) of the head sealing section 2 ' and the straight body part 1 ', a joint line of a starting line of one end of the resin liner, the head sealing section 2 ' and the bottle mouth valve seat 3 ', and the carbon nanotube heating element is disposed on the surface of the resin liner of the head sealing section of the container body. Under the condition, the active temperature regulation mode of the hydrogen storage bottle is adopted for the first time to regulate the temperature of the part of the hydrogen storage bottle most prone to hydrogen leakage, namely the joint part of the metal bottle valve seat and the resin. The temperature of the part is prevented from being reduced below the glass transition temperature of the resin material, so that the liner material can work within the range of ensuring the performance of the liner material, thereby reducing the risk of fatigue and hydrogen leakage caused by the reduction of the low-temperature performance of the material and improving the safety of the hydrogen storage bottle.
The pressure gas storage container also comprises a carbon fiber layer arranged on the inner surface of the pressure gas storage container body, and the carbon fiber layer at least covers the carbon nano tube heating component. The carbon fiber layer is used as a pressure-resistant layer and provides strength for the whole pressure gas storage container. The thickness of the carbon fiber layer corresponds to the gas pressure in the pressure gas storage container, and the safety factor is 2.25. In some embodiments, when the pressure gas storage vessel is a four-type high pressure hydrogen storage cylinder, the carbon fiber layer may be 25mm thick.
In some embodiments, the carbon fiber layer may be disposed on the basis of the embodiment provided in the first aspect, before the carbon nanotube film heating element is cured, the carbon fiber layer is formed by winding carbon fibers on the surface of the carbon nanotube film heating element, and finally, the carbon fiber layer is cured, so as to obtain the resin-liner hydrogen storage bottle with the carbon nanotube film heating element. In some embodiments, the carbon nanotube heating assembly is tested prior to the time the carbon fiber layup is disposed, illustratively, as follows: the wire is connected to a direct current power supply, and the specification is 12v voltage and 1A current. And electrifying, testing, and determining whether the carbon nano tube heating assembly can be heated to 40-60 ℃ within 5 seconds. If it is possible to work properly, the subsequent carbon fibre lay-up can be carried out. After the carbon fiber layer is laid and solidified, the carbon fiber layer is connected with a direct-current power supply again for testing, and the heating film can work normally.
In some embodiments, the pressure gas storage container further comprises a temperature sensor, and the temperature difference sensor is electrically connected to the carbon nanotube film heating element. The temperature sensor is used for detecting the temperature of the body of the current pressure gas storage container or the gas in the bottle. In some embodiments, the temperature sensor is disposed within a head seal segment of the pressure reservoir or within the safety valve.
In some embodiments, the pressurized gas storage container further comprises a controller for regulating the temperature of the carbon nanotube film heating assembly. The controller can control the output voltage and current to accommodate different heating requirements. In the assembly, the carbon nanotube film heating element is connected to a power source via a lead, in particular a carbon nanotube fiber lead, leading from the interior of the container, or a common lead connected to the carbon nanotube fiber lead.
The target temperature is set in the controller, the temperature sensor detects the current temperature of the body of the pressure gas storage container or the gas in the container, and when the temperature of the body of the pressure gas storage container is lower than the target temperature, the controller controls the power supply to output current to electrify the carbon nanotube film heating element, so that the carbon nanotube film heating element is heated to heat the designated position. In some embodiments, the temperature sensor and the power source are connected by a common wire.
The pressure gas storage container provided by the embodiment of the application can realize active temperature control of the resin liner high-pressure hydrogen storage bottle.
The following description will be made with reference to specific examples, in which a four-type high-pressure hydrogen storage container having a diameter of 400mm, an axial length of 900mm, and a spherical head-sealing shape is taken as an example, and the axial length of a region covering a carbon nanotube film is 40 mm. Wherein, the model is as follows: the paper pulp model with the same size and the same shape as the head sealing section of the target gas cylinder is manufactured by using glassine paper.
Example 1
The preparation method of the carbon nano tube film comprises the following steps:
(1) drawing a carbon nanotube array film with the width of 40mm from the carbon nanotube array, and winding 50 layers along the pulp model;
(2) and cutting the annular carbon nanotube fiber prefabricated film along the direction perpendicular to the winding direction of the fiber, and removing the annular carbon nanotube fiber prefabricated film from the mold. Placing the carbon nano tube prefabricated film in CH with the mass concentration of m-chloroperoxybenzoic acid (m-CPBA) being 1-3%2Cl2The solution was dissolved for 30 minutes, subjected to epoxidation treatment, and then residual m-CPBA was removed with methylene chloride and ethanol. Subsequently, the carbon nanotube pre-formed film was dried at 50 ℃ for 2 hours to remove the solvent;
(3) placing the carbon nano tube prefabricated film subjected to epoxidation treatment on a paper pulp model of a target hydrogen storage bottle head section, and performing densification treatment on the carbon nano tube prefabricated film by using a roller through rolling to finally prepare the carbon nano tube film with the thickness of 5 micrometers.
Example 2
The preparation method of the carbon nano tube film comprises the following steps:
(1) drawing a carbon nanotube array film with the width of 40mm from the carbon nanotube array, and winding 100 layers of carbon along the pulp model;
(2) and cutting the carbon annular carbon nanotube fiber prefabricated film along the direction perpendicular to the winding direction of the fiber, and taking the carbon annular carbon nanotube fiber prefabricated film off the mold. Placing the carbon nano tube prefabricated film in CH with the mass concentration of m-chloroperoxybenzoic acid (m-CPBA) being 1-3%2Cl2The solution was dissolved for 30 minutes, subjected to epoxidation treatment, and then residual m-CPBA was removed with methylene chloride and ethanol. Then, willDrying the carbon nanotube film at 50 ℃ for 2 hours to remove the solvent;
(3) placing the carbon nano tube prefabricated film subjected to epoxidation treatment on a paper pulp model of a target hydrogen storage bottle head section, and performing densification treatment on the carbon nano tube prefabricated film by using a roller through rolling to finally prepare the carbon nano tube film with the thickness of 10 micrometers.
Example 3
The preparation method of the carbon nano tube film comprises the following steps:
(1) drawing a carbon nanotube array film with the width of 40mm from the carbon nanotube array, and winding 100 layers of carbon along the pulp model;
(2) and cutting the carbon annular carbon nanotube fiber prefabricated film along the direction perpendicular to the winding direction of the fiber, and taking the carbon annular carbon nanotube fiber prefabricated film off the mold. Placing the carbon nano tube prefabricated film in CH with the mass concentration of m-chloroperoxybenzoic acid (m-CPBA) being 1-3%2Cl2The solution was dissolved for 30 minutes, subjected to epoxidation treatment, and then residual m-CPBA was removed with methylene chloride and ethanol. Subsequently, the carbon nanotube film was dried at 50 ℃ for 2 hours to remove the solvent;
(3) placing the carbon nano tube prefabricated film subjected to epoxidation treatment on a paper pulp model of a target hydrogen storage bottle head section, and performing densification treatment on the carbon nano tube prefabricated film by using a roller through rolling to finally prepare the carbon nano tube film with the thickness of 20 micrometers.
And (3) performing basic performance test on the carbon nano film obtained in the embodiment, wherein the width of a test carbon nano film sample strip is 5mm, the length of the test carbon nano film sample strip is 20mm, and the test speed is as follows: 0.5 mm/min. The tensile strength test uses carbon nanotube films with the same number of layers as the carbon nanotube films in the examples of the present application as test samples. The test results are shown in table 1 below.
TABLE 1
As can be seen from Table 1, the carbon nanotube films obtained in examples 1 to 3 have better tensile strength.
Examples 4 to 6
The carbon nanotube film heating elements prepared by respectively adopting the carbon nanotube films with different thicknesses prepared in the above embodiments 1 to 3 have the following steps:
(4) the carbon nanotube films obtained in the above 3 embodiments were cut, and the carbon nanotube films were cut into the shape shown in fig. 2, with the width of the notch portion being 1mm, for the subsequent steps to set the conductive side.
(5) An insulating layer made of polyethylene terephthalate (PET) is arranged at the notch of the cut carbon nanotube film and in the direction corresponding to one surface of the carbon nanotube film, see D in fig. 2, the thickness of the insulating layer is about 100 micrometers, and the carbon nanotube film and the insulating layer are bonded together by using an epoxy resin adhesive.
(6) Conductive silver paste is coated at the conductive side edges, and the width of the paste is about 2 mm. The silver paste contains conductive nano silver particles, and the thickness of the conductive coating is about 40-50 microns.
(7) And obtaining a carbon nanotube film with the width of 75mm from the carbon nanotube array again, and twisting and spinning the carbon nanotube film into carbon nanotube fiber yarns with the twist of 1300 tpm. 10 carbon nanotube fiber yarns are spun into carbon nanotube fiber bundles of about 100 microns. And adopting a polar solvent to carry out densification treatment on the carbon nano tube fiber bundle. And wiping the carbon nano tube fiber prepared in the step for 2-3 times by using a cotton swab soaked with alcohol.
(8) Attaching the carbon nanotube fiber wire to two fracture surfaces, namely two conductive side edges, namely B and C in the figure 2, and pressing the carbon nanotube fiber wire in a rolling manner; and curing at room temperature to tightly connect the conducting wire and the conducting side edge to obtain the carbon nano tube film heating element.
And (3) electrifying the prepared carbon nanotube film heating elements respectively, wherein the voltage is 5v and 12v, the current is 1A, and testing the temperature rise speed. The results are shown in table 2 below.
TABLE 2
As can be seen from table 2, the carbon nanotube film heating element prepared in the embodiment of the present application can effectively regulate and control the temperature of the bottle body or the gas in the bottle, thereby improving the working performance of the liner material of the pressure gas storage container based on the full winding of the carbon fiber of the plastic liner at different working temperatures and improving the durability of the liner material.
Examples 7 to 9
The carbon nanotube film heating elements prepared in the above examples 4 to 6 were respectively mounted to a high pressure hydrogen storage bottle, and the steps were as follows:
coating heat-conducting glue on an area, to be attached with a heating film, of a resin inner container of the pressure gas storage container, laying a carbon nanotube film heating element on the surface of the resin inner container, adhering a wire on the surface of a seal head by using an adhesive, and fixing the wire at the seal head;
and (3) laying carbon fibers, laying 15 layers of carbon fibers, and sending the carbon fibers into an autoclave for curing after laying is finished.
And respectively connecting the leads of the carbon nanotube film heating elements in the 3 high-voltage hydrogen storage tanks to a universal meter, and respectively testing the resistance of the carbon nanotube film heating elements.
TABLE 3
| Item | Example 7 | Example 8 | Example 9 |
| Resistance omega | 117.0 | 228.3 | 433.6 |
As can be seen from table 3, after the carbon nanotube film heating element is installed between the resin inner container and the carbon fiber, the resistance is still substantially the same as that when the carbon nanotube film heating element is not installed, which indicates that the internal structure of the carbon nanotube film heating element remains intact, the resin inner container and the carbon fiber still have good adhesion performance, and the problem of a large reduction in resistance due to a short circuit with the carbon fiber or a large increase in resistance due to an open circuit caused by poor adhesion does not occur.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A manufacturing method of a heating component for an inner container of a pressure air storage container is characterized by comprising the following steps:
manufacturing a pressure gas storage container model with the same shape and size as the target pressure gas storage container;
for the manufactured pressure gas storage container model, forming a carbon nano tube film heating element with the shape matched with the shape of the corresponding area of the pressure gas storage container model on the surface of the area to be prepared with the carbon nano tube film heating element;
coating heat-conducting glue on an area of a resin inner container of the pressure gas storage container, to which a heating film is to be attached, separating and moving the carbon nanotube film heating element from the pressure gas storage container model, paving the carbon nanotube film heating element in an area corresponding to the heat-conducting glue, and then curing the carbon nanotube film heating element.
2. The method of claim 1, wherein in the step of fabricating the carbon nanotube heating film heating element:
preparing an annular carbon nanotube prefabricated film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared;
and cutting the annular carbon nanotube prefabricated film, arranging an insulating layer at the notch part formed by cutting, and arranging conducting wires on the two cut surfaces formed by cutting to finally obtain the carbon nanotube film heating element.
3. The method of claim 2, wherein the step of preparing the annular carbon nanotube pre-film on the surface of the area of the pressurized gas container model where the carbon nanotube film heating element is to be prepared comprises: and winding a carbon nanotube array film on the surface of the area of the pressure gas storage container model where the carbon nanotube film heating element is to be prepared, so as to obtain the annular carbon nanotube prefabricated film.
4. The method of claim 3, wherein in the step of winding the carbon nanotube array film on the surface of the area of the pressure vessel model where the carbon nanotube film heating element is to be prepared, the number of winding layers of the carbon nanotube array film is 50-200.
5. The method for manufacturing a heating element for a liner of a pressure gas storage container according to claim 2, wherein the step of cutting the prefabricated film of annular carbon nanotubes further comprises: and carrying out pretreatment and densification treatment on the cut carbon nanotube array film.
6. The method of claim 5, wherein the thermally conductive adhesive comprises an epoxy resin and the pre-treatment comprises an epoxy treatment.
7. The method for manufacturing the heating assembly for the inner container of the pressure air storage container as claimed in any one of claims 1 to 6, wherein the thickness of the carbon nanotube heating film is 5 to 20 μm.
8. The method for manufacturing a heating element for a liner of a pressure gas storage container according to any one of claims 2 to 6, wherein the step of providing wires on the two cut surfaces comprises:
coating conductive slurry on the two cut surfaces formed by cutting, attaching the lead on the surfaces of the cut surfaces, compacting and curing; and/or
The lead is a carbon nanotube fiber lead.
9. A pressurized gas storage container, comprising:
a pressure gas storage container body;
the carbon fiber layer is wound on the surface of the pressure air storage container body and used for reinforcing;
the carbon nanotube film heating assembly is arranged between at least part of the inner surface of the pressure gas storage container body and the carbon fiber layer.
10. The pressure gas storage container of claim 9, wherein the carbon nanotube film heating element is manufactured by the method of any one of claims 1 to 8; and/or
The pressure gas storage container also comprises a temperature sensor for regulating and controlling the carbon nano tube heating element, and the temperature difference sensor is electrically connected with the carbon nano tube film heating component; and/or
The carbon nano tube film heating assembly is arranged at the head sealing section of the container body.
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