Heating device, method of manufacturing a heating device, and electronic atomization apparatus

Abstract

The application discloses a heating device, a manufacturing method of the heating device and an electronic atomization equipment. The heating device comprises a tobacco pipe, a heating layer and a cladding layer. The tobacco pipe is made of a conductive material, and the tobacco pipe is internally provided with a containing cavity for placing a tobacco stick. The heating layer wraps the tobacco pipe, and the heating layer is a graphite film or a graphene film. The cladding layer wraps the heating layer and is made of a conductive material. A first electrode is connected to the tobacco pipe, a second electrode is connected to the cladding layer, and the first electrode, the tobacco pipe, the heating layer, the cladding layer and the second electrode are sequentially communicated. Through the design, efficient heat transfer can be realized, so that the waiting time for smoking can be effectively reduced, and the structural stability of the heating device can be improved to prevent the structure from falling off.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a heating device, a method for manufacturing the heating device, and an electronic atomization device. Background Technology

[0002] As the core component of heated non-combustible atomizing equipment, the heating device heats the cigarette to produce a flavored aerosol for the smoker. Its performance plays a decisive role in the overall effect of the atomizing equipment and the consumer's smoking experience.

[0003] Currently, heating devices are generally designed in two ways. The first is to coat an aluminum tube with a polyimide heating film (polyimide acts as an insulating layer, preventing the metal heating element from contacting the aluminum substrate). The second is an aluminum-based thick-film heating element (a layer of insulating dielectric, a silver-palladium metal heating layer, an electrode layer, and a surface protective layer are sequentially coated and sintered onto the aluminum substrate). The first design, due to the presence of the flexible PI (polyimide) organic thin film material, cannot withstand continuous operating temperatures of 300-350 degrees Celsius or the instantaneous high temperatures that may be reached during operation at 350-400 degrees Celsius. Furthermore, it hinders heat transfer from the heating element to the aluminum substrate, resulting in a longer smoke emission waiting time. The second design suffers from significant differences in the thermal expansion rates of the various layers of the heating element. At temperatures above 250 degrees Celsius, the aluminum substrate easily detaches from the heating element, and the manufacturing cost is very high. These reasons limit the application of aluminum-based heating elements in non-combustible atomizing equipment. The market anticipates breakthroughs in the application of aluminum-based heating elements through new technologies and processes. Summary of the Invention

[0004] The purpose of this application is to provide a heating device, a method for manufacturing the heating device, and an electronic atomizing device that can effectively reduce smoke production time and avoid structural detachment.

[0005] This application discloses a heating device, including a smoke tube, a heating layer, and a covering layer. The smoke tube is made of a conductive material and has a cavity for holding a cigarette. The heating layer wraps around the smoke tube and is a graphite film or a graphene film. The covering layer wraps around the heating layer and is made of a conductive material. A first electrode is connected to the smoke tube, and a second electrode is connected to the covering layer. The first electrode, the smoke tube, the heating layer, the covering layer, and the second electrode are sequentially connected.

[0006] Optionally, the smoke pipe is made of aluminum or aluminum alloy, and the covering layer is aluminum foil.

[0007] Optionally, the wall thickness of the flue is 100-1000 μm, the thickness of the heating layer is 15-200 μm, and the thickness of the covering layer is 10-100 μm.

[0008] Optionally, the first electrode is annular and is disposed around one end of the flue; the second electrode is strip-shaped and surrounds and fixes the coating layer.

[0009] Optionally, the first electrode is located at the end of the cigarette tube away from the mouthpiece, and the second electrode is located at the end of the covering layer away from the mouthpiece.

[0010] Optionally, along the central axis of the heating device, the length of the flue is greater than the length of the heating layer, and the length of the heating layer is greater than the length of the covering layer; and the two ends of the flue protrude from the two ends of the heating layer, and the two ends of the heating layer protrude from the two ends of the covering layer.

[0011] This application also discloses a method for manufacturing a heating device, which includes the steps described above:

[0012] Prepare a pipe;

[0013] The heating layer and the covering layer are sequentially wrapped around the outside of the flue; and

[0014] Fix the coating layer.

[0015] Optionally, the step of sequentially wrapping the heating layer and the covering layer around the flue includes:

[0016] First, wrap the heating layer around the flue, then wrap the covering layer around the heating layer; or

[0017] First, fix one end of the heating layer to one end of the covering layer, then wrap the fixedly connected heating layer and covering layer sequentially around the flue; or

[0018] First, the coating layer is applied to the heating layer to form a composite film layer, and then the composite film layer is wrapped around the flue.

[0019] Optionally, the step of fixing the covering layer includes:

[0020] The cover layer is secured by using the watch strap fingers to slip over it; or

[0021] The coating layer is fixed by knotting around its periphery; or

[0022] The cladding layer is fixed by welding the ends of the cladding layer; or

[0023] The coating layer is fixed by clamping the end point and the inner side of the coating layer with a pin.

[0024] This application also discloses an electronic atomizing device, including a battery assembly and a heating device as described above, wherein the battery assembly powers the heating device.

[0025] Compared to heating devices that use aluminum-based thick-film heating elements or polyimide heating films coated on aluminum tubes, this application designs a heating device consisting of a coating layer, a heating layer, and a smoke tube sequentially surrounding the device. The smoke tube and coating layer are both made of conductive materials and are respectively connected to the first and second electrodes. The heating layer is a graphite film or graphene film. With this design, when the heating device is conductive, connecting the first and second electrodes to a power source, the first electrode, smoke tube, heating layer, coating layer, and second electrode are sequentially connected. Because the graphite film or graphene film is a two-dimensional material with anisotropic resistivity, and the material has a high resistivity along the direction perpendicular to the interlayer, it facilitates conductivity. It can generate a large amount of heat, which is then transferred to the smoke tube to heat the smoke tube and in turn heat the cigarette. During this process, the heat is not blocked by the insulation layer or other film layers, which can achieve efficient heat transfer and thus effectively reduce the waiting time for smoke to be produced. Furthermore, the heating device in this application contains fewer film layers and adopts a winding structure design, which avoids the high cost and demanding manufacturing process conditions of aluminum-based thick film heating elements, and avoids the temperature limitations caused by thermal expansion matching cracking during the use of aluminum-based thick film heating elements. Thus, while achieving ultra-low cost and high efficiency, it can also improve the structural stability of the heating device and prevent structural detachment. Attached Figure Description

[0026] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0027] Figure 1 This is a schematic diagram of an electronic atomizing device provided in an embodiment of this application;

[0028] Figure 2 This is a cross-sectional schematic diagram of a heating device provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of a heating device provided in an embodiment of this application;

[0030] Figure 4 This is a flowchart of a method for manufacturing a heating device according to an embodiment of this application.

[0031] Among them, 10 is an electronic atomizing device; 100 is a heating device; 110 is a cigarette tube; 120 is a heating layer; 130 is a coating layer; 140 is a first electrode; 150 is a second electrode; and 200 is a battery assembly. Detailed Implementation

[0032] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments. In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implicitly specifying the number of indicated technical features. Thus, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0033] Furthermore, terms such as "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] like Figure 1 As shown, this application discloses an electronic atomizing device 10, which includes a battery assembly 200 and a cartridge. The cartridge includes a housing, a heating device 100 and a mouthpiece. The heating device 100 is disposed inside the housing and communicates with the battery assembly 200. The mouthpiece is disposed at the end of the housing away from the battery assembly 200.

[0036] like Figure 2 and Figure 3 As shown, this application also discloses a heating device 100, which can be used in the aforementioned e-cigarette cartridges and electronic atomizing devices 10. The heating device 100 includes a cigarette tube 110, a heating layer 120, and a covering layer 130. The cigarette tube 110 has a cavity for holding the cigarette. The cigarette tube 110 is made of a conductive material. Specifically, the cigarette tube 110 can be an aluminum-based round tube, or a copper-clad aluminum round tube, an aluminum-copper-aluminum round tube, or other composite aluminum round tubes. Since aluminum or aluminum alloys have good electrical and thermal conductivity, using aluminum or aluminum alloys in the cigarette tube 110 can reduce the heat loss caused by heat transfer to the cigarette tube 110. Preferably, the cigarette tube 110 can be a 6-series aluminum alloy tube or a 7-series aluminum alloy tube, as shown in Table 1. These two materials have high melting temperatures and high yield strength, and are not easily melted or deformed during use, nor are they prone to releasing harmful substances that could affect human health. Moreover, these two materials have relatively high electrical and thermal conductivity at room temperature, resulting in low energy consumption.

[0037]

[0038] Table 1: Properties of Some 6-series and 7-series Aluminum Alloys

[0039] The heating layer 120 is a graphite film or graphene film, wrapping around the outer ring of the smoke tube 110 at least once. Compared to directly depositing the film on the smoke tube 110, directly wrapping the formed heating layer 120 around the outside of the smoke tube 110 reduces costs, ensures the required thickness of the heating layer 120, and prevents the risk of detachment. Similarly, the covering layer 130 wraps around the heating layer 120 at least once, and the covering layer 130 is made of a conductive material. Since the heating layer 120 is relatively fragile and is directly wound around the smoke tube 110, wrapping it with a covering layer 130 can effectively protect the heating layer 120, preventing it from being scratched or worn. It also helps to secure the heating layer 120, preventing it from loosening and affecting its tension, which could lead to insufficient adhesion between the heating layer 120 and the smoke tube 110. The covering layer 130 can be made of aluminum foil, which not only has good conductivity like the smoke tube 110 but also good flexibility. It can maintain good tension when wrapping the heating layer 120, facilitating its secure fixation.

[0040] A first electrode 140 is connected to the smoke tube 110, and a second electrode 150 is connected to the covering layer 130. The first electrode 140 and the second electrode 150 are respectively connected to the positive and negative terminals of the battery assembly 200. The first electrode 140, the smoke tube 110, the heating layer 120, the covering layer 130 and the second electrode 150 are connected in sequence to form a series path.

[0041] In the current heating device 100, regardless of whether graphene film or graphite film is used as the heating structure, or metal sheet or wire is used as the heating structure, the two electrodes connecting the battery assembly 200 are generally directly connected to both ends of the heating structure, specifically along its length or sheet direction. The heating structure is heated by direct conductivity, and the heat is transferred to the cigarette tube 110 or the atomizing core. This design utilizes the parallel properties of the conductive structure between layers, facilitating current flow through all parts of the heating structure and ensuring the overall electrical and heating performance. The use of graphene film or graphite film as the heating structure was initially applied to other large-scale heating devices. To ensure the heating effect of each part of the graphene film or graphite film and facilitate processing, electrodes are generally directly connected to both ends of the graphene film or graphite film along its sheet direction. The use of graphene film or graphite film in the electronic atomizing device 10 also largely adopts this design concept, similarly directly connecting electrodes to both ends of the graphene film or graphite film along its sheet direction.

[0042] The inventors considered that graphite film or graphene film is a flexible two-dimensional material with anisotropic resistivity. The material has a large resistivity (700-3000 μΩm) along the direction perpendicular to the interlayer, which is much higher than the resistivity of aluminum (0.028 μΩm) and also significantly higher than the commonly used heating material Kanthal (1.40 μΩm). Some physical performance parameters of graphite film or graphene film material are shown in Table 2 below.

[0043] physical quantity parameter Resistivity parallel to the interlayer (20℃) 2.5~15μΩm Resistivity perpendicular to the interlayer (c-axis resistivity) (20℃) 700~3000μΩm Thermal conductivity parallel to the interlayer (20℃) 1300~1900W / (mK) Thermal conductivity perpendicular to the interlayer (20℃) 5~10W / (mK) Long-term temperature resistance in air 400℃ Long-term temperature resistance in a vacuum or air-isolated environment 2200～3000℃

[0044] Table 2: Partial physical property parameters of graphite film or graphene film materials

[0045] Because the graphite film or graphene film has a high resistance along the direction perpendicular to the interlayer, while the resistance of the cigarette tube 110 and the coating layer 130 is low, and the cigarette tube 110 and the coating layer 130 are not in contact, the heating layer 120 can adhere to the cigarette tube 110 and the coating layer 130 without causing a short circuit. Furthermore, this embodiment of the application conducts electricity to both the inner and outer sides of the heating layer 120, fully utilizing its high resistivity perpendicular to the interlayer. This design, compared to the prior art design that connects electrodes to both ends of the graphene film or graphite film along the sheet direction, allows for the release of greater heat in the same amount of time under the same power requirements, thus enabling rapid smoke output from the cigarette.

[0046] Testing revealed that, using the design of this embodiment, the heating layer 120 can directly contact the smoke tube 110 for rapid heat transfer. Preliminary tests showed that smoke could be emitted within 15-20 seconds. While maintaining a high heating power, smoke could be emitted within 15 seconds, or even 10 seconds, achieving a relatively balanced flavor. Because the heating layer 120 wraps around the smoke tube 110 and is in complete contact with it, heat transfer is uniform, and no localized overheating occurs even at high heating power. Further improvements are expected to further shorten the smoke emission time, thereby significantly reducing user waiting time and improving the user experience.

[0047] Compared to designs using aluminum-based thick-film heating elements or coating aluminum tubes with polyimide heating films, the heating device 100 in this embodiment avoids the low thermal conductivity of organic materials hindering rapid heat transfer from the heating material to the substrate (cigarette tube 110), and avoids the limitation of the heating element's operating temperature by the temperature resistance of the organic materials themselves. Furthermore, because aluminum has good electrical conductivity but poor self-heating properties, and the current passes through the cigarette tube 110, heating layer 120, and coating layer 130, and the heating layer 120 has a relatively high resistivity, and because the power of the electronic atomizing device 10 is generally low, the cigarette tube 110 will not generate very high temperatures that could cause the cigarette to burn—this has been experimentally verified.

[0048] This application embodiment designs a heating device 100 consisting of a covering layer 130, a heating layer 120, and a smoke tube 110 sequentially surrounding the device. Both the smoke tube 110 and the covering layer 130 are made of conductive material and are respectively connected to the first electrode 140 and the second electrode 150. The heating layer 120 is a graphite film or a graphene film. With this design, when the heating device 100 is conductive, connecting the first electrode 140 and the second electrode 150 to a power source, the first electrode 140, the smoke tube 110, the heating layer 120, the covering layer 130, and the second electrode 150 are sequentially connected. Because the graphite film or graphene film is a two-dimensional material with anisotropic resistivity, the material has a high resistivity along the direction perpendicular to the interlayer. When conducting electricity, it can generate a large amount of heat, which is then transferred to the smoke tube 110 to heat the smoke tube 110 and in turn heat the cigarette. During this process, the heat is not blocked by the insulation layer or other film layers, which can achieve efficient heat transfer and thus effectively reduce the waiting time for smoke to be emitted. Furthermore, the heating device 100 in this application contains fewer film layers and adopts a winding structure design, which avoids the high cost and harsh manufacturing process conditions of aluminum-based thick film heating elements, and avoids the temperature limitation caused by preventing thermal expansion and cracking during the use of aluminum-based thick film heating elements. Thus, while achieving ultra-low cost and high efficiency, it can also improve the structural stability of the heating device 100 and prevent structural detachment.

[0049] Furthermore, due to the strong negative temperature coefficient effect of graphite or graphene films, the room temperature resistance of the prepared heating layer 120 is generally 2-2.5 ohms, which drops to 0.4-0.5 ohms at operating temperature. Temperature control can be achieved based on the temperature coefficient of resistance. Therefore, the power module controlling the heating layer 120 does not require transformer processing (rapid smoke generation within 10-15 seconds can be achieved at 4V). When the power module adopts constant current output mode, the negative temperature coefficient effect of graphite or graphene films can achieve automatic protection and temperature limiting function to prevent the cigarette from burning and affecting the smoke sensation.

[0050] The heating layer 120 can be formed by high-temperature carbonization and graphitization of an ultra-thick polyimide film (≥125µm) made of a pure polyimide film of conventional thickness, doped with graphene and carbon nanotubes. Alternatively, it can be formed by coating graphene oxide into rolls of different thicknesses (coating and rolling with the aid of a peelable substrate), and then carbonizing and graphitizing the substrate after peeling it off.

[0051] In this embodiment, the wall thickness of the flue 110 is 100-1000 μm, the thickness of the heating layer 120 is 15-200 μm, and the thickness of the coating layer 130 is 10-100 μm. The outer wall of the flue maintains a certain roughness, either entirely or partially, such as Ra 0.02 μm-2 μm, to improve the friction between the outer wall and the graphite film or graphene film.

[0052] Along the central axis of the heating device 100, the length of the flue 110 is greater than the length of the heating layer 120, and the length of the heating layer 120 is greater than the length of the covering layer 130; and the two ends of the flue 110 protrude beyond the two ends of the heating layer 120, and the two ends of the heating layer 120 protrude beyond the two ends of the covering layer 130. The first electrode 140 is connected to the end of the flue 110 or the outer surface of the flue 110, and does not contact the heating layer 120 or the covering layer 130; the second electrode 150 is connected to the outer surface of the covering layer 130, and does not contact the flue 110 or the heating layer 120.

[0053] Specifically, the first electrode 140 can be a wire directly connected to a point at the end of the smoke tube 110; or, the first electrode 140 can be a sheet-like annular electrode ring surrounding one end of the smoke tube 110; or, the first electrode 140 can be multiple wires sequentially connected to the smoke tube 110; or, the first electrode 140 can be a strip wrapped around the end of the smoke tube 110. The connection method between the first electrode 140 and the smoke tube 110 can be welding, bonding, or snap-fitting, etc., and is not limited here. The second electrode 150 can be a wire directly connected to a point on the covering layer 130; or, the second electrode 150 can be a sleeve directly wrapped around the outside of the covering layer 130; or, the second electrode 150 can be a strip structure wrapped around the covering layer 130.

[0054] Optionally, the first electrode 140 is annular and is disposed around one end of the smoke tube 110; the second electrode 150 is strip-shaped and surrounds and fixes the covering layer 130. Since both the smoke tube 110 and the covering layer 130 are cylindrical conductive structures, after the first electrode 140 and the second electrode 150 are connected around the smoke tube 110 and the covering layer 130 respectively, the conductivity of the smoke tube 110 and the covering layer 130 is uniform, thereby enabling the heating layer 120 to conduct electricity and generate heat uniformly throughout.

[0055] Specifically, the first electrode 140 and the second electrode 150 can both be located at the same end of the heating device 100, that is, the end of the pipe 110 and the covering layer 130 near or away from the mouthpiece; or, the first electrode 140 and the second electrode 150 can be located at opposite ends of the heating device 100, that is, one is located near the mouthpiece and the other is located away from the mouthpiece; or, the first electrode 140 is connected to the end of the pipe 110 and the second electrode 150 is connected to the position between the two ends of the covering layer 130.

[0056] Optionally, the first electrode 140 is located at the end of the pipe 110 furthest from the mouthpiece, and the second electrode 150 is located at the end of the covering layer 130 furthest from the mouthpiece. In a typical electrode design, the two electrodes are connected to opposite ends of a conductor, allowing current to flow from one end to the other, resulting in uniform heating of the entire heating structure. However, in this embodiment, both electrodes are located at the same end, i.e., the same end of the heating layer 120. Thus, when the first electrode 140 and the second electrode 150 are connected to a power source, the current flows vertically along the heating layer 120, fully utilizing the resistivity of the heating layer 120 perpendicular to the interlayer structure. As the current diffuses from one end of the pipe 110 to the other, and from one end of the covering layer 130 to the other, since both the pipe 110 and the covering layer 130 are made of aluminum, their conductivity is the same, and the current transfer speed is the same. This ensures that the current conduction direction is perpendicular to the heating layer 120 at all points between the smoke tube 110 and the covering layer 130. In other words, the overall conductive structure of the smoke tube 110, the heating layer 120 and the covering layer 130 can be regarded as a multi-point small structure. Each small structure has two conductors connected to the two ends of a resistor (taking one position of the heating layer 120 as the resistor and the smoke tube 110 and the covering layer 130 that are attached to the heating layer 120 at that point as the conductors). This allows the resistivity of the heating layer 120 in the direction perpendicular to the interlayer to be fully utilized.

[0057] In addition, the cartridge is equipped with an insulating and heat-insulating structure inside the shell to enclose the heating device 100, preventing the product from leaking electricity or getting too hot to handle.

[0058] like Figure 4As shown, this application also discloses a method for manufacturing a heating device, used to manufacture the aforementioned heating device 100. The manufacturing method specifically includes the following steps:

[0059] S1: Prepare a pipe;

[0060] S2: The heating layer and the covering layer are sequentially wrapped around the outside of the flue;

[0061] S3: Fix the covering layer.

[0062] This application embodiment employs a winding assembly manufacturing process to fabricate the heating device 100, avoiding the high-cost and demanding manufacturing conditions of aluminum-based thick-film heating elements, and avoiding the temperature limitations caused by thermal expansion cracking during the use of aluminum-based thick-film heating elements. In this application embodiment, a graphite film or graphene film and an aluminum foil strip are sequentially and individually wound around the outer wall of the smoke tube 110 (aluminum-based circular tube), and tension is applied during the winding process to ensure tight adhesion to the inner layer material. This winding manufacturing process helps to improve the tension between the coating layer 130, the heating layer 120, and the smoke tube 110, ensuring the contact effect between adjacent film layers, improving the stability of the entire heating device 100, and also helping to save costs and improve process efficiency.

[0063] In step S2, the heating layer 120 can be wound around the flue tube 110 first, and then the covering layer 130 can be wound around the heating layer 120. The heating layer 120 can be wound around the flue tube 5 / 4 to 2 turns or 1 to 2 turns, and the edge of the covering layer 130 in the width direction does not exceed the edge of the graphite film or graphene film to prevent the covering layer 130 from contacting the flue tube 110 and forming a short circuit.

[0064] Alternatively, one end of the heating layer 120 can be fixedly connected to one end of the covering layer 130, and then the fixedly connected heating layer 120 and covering layer 130 can be wound onto the smoke tube 110 in sequence. This design reduces the relative sliding between the covering layer 130 and the graphite film or graphene film, increases the total friction, and prevents unwinding. Specifically, a small amount of edible water-based adhesive (such as linear starch, food-grade polyvinyl alcohol PVA, which can be removed later) can be used to overlap the heating layer 120 and the covering layer 130 at the connection point, and then the mixture can be wound onto the smoke tube 110. Alternatively, no additional material can be used at the connection point between the heating layer 120 and the covering layer 130. Instead, another piece of aluminum foil can be used to wrap the connection point between the heating layer 120 and the covering layer 130, fold and overlap it, and then the mixture can be wound onto the smoke tube 110. The inventors found through testing that when the heating device 100 made using this method is powered on and heated with a power supply voltage of 4V, a current of less than or equal to 5A, and a constant voltage output (power <20W), smoke is produced in about 15 seconds, which is shorter than the smoke production time of current electronic atomization devices. Furthermore, by comparing the baking effect of different electronic atomization devices on the cigarette after 4 minutes, it was found that the electronic atomization device using the embodiment of this application has a more uniform and thorough baking effect on the cigarette.

[0065] Alternatively, the coating layer 130 can be first applied to the heating layer 120 to form a composite film, and then the composite film can be wound around the smoke tube 110. Specifically, one side of the graphite film or graphene film is aluminum-plated by PVD or other methods, with a plating thickness of 1-500 micrometers, and then pressed with aluminum foil strip at high temperature along the plating surface.

[0066] In step S3, the covering layer 130 can be fixed by using watch strap contact fingers to cover it. Specifically, beryllium copper watch strap contact fingers with good resilience and conductivity can be used, and multi-contact technology can be used to reduce contact resistance. Alternatively, the covering layer 130 can be fixed by knotting around its perimeter. Specifically, a strap loop can be used to tighten the knot after one loop. Alternatively, the covering layer 130 can be fixed by welding its ends. Specifically, ultrasonic welding equipment (or spot welding machine or other equipment) can be used to weld the aluminum foil ends, and only the necessary length of the welded part can be retained (the retained length does not exceed 1-2 mm, and the excess part is cut off). Alternatively, the covering layer 130 can be fixed by clamping the ends of the covering layer 130 and the inner side of the covering layer 130 with pins. Specifically, the foil is subjected to pin-blocking contact, and the foil with low resilience but high strength is used for self-locking. Of course, the fixing method of the covering layer 130 in this embodiment is not limited to these methods, and the specific fixing method can be designed according to the needs.

[0067] It should be noted that the limitations on each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the scope of protection of this application.

[0068] The above description, in conjunction with specific optional embodiments, further illustrates this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications and substitutions should be considered within the scope of protection of this application.

Claims

1. A heating device, characterized in that, include: A cigarette tube, wherein the cigarette tube is made of conductive material and has a cavity for holding a cigarette. A heating layer, enclosing the smoke tube, wherein the heating layer is a graphite film or a graphene film; and A coating layer, which encloses the heating layer, is made of a conductive material; The first electrode is connected to the smoke tube, and the second electrode is connected to the covering layer. The first electrode, the smoke tube, the heating layer, the covering layer and the second electrode are connected in sequence. Both the cigarette tube and the covering layer are made of aluminum. The first electrode is located at the end of the cigarette tube away from the mouthpiece, and the second electrode is located at the end of the covering layer away from the mouthpiece.

2. The heating device as described in claim 1, characterized in that, The wall thickness of the flue is 100-1000um, the thickness of the heating layer is 15-200um, and the thickness of the covering layer is 10-100um.

3. The heating device as described in claim 1, characterized in that, The first electrode is ring-shaped and is disposed around one end of the smoke tube; the second electrode is strip-shaped and surrounds and fixes the coating layer.

4. The heating device as described in claim 1, characterized in that, Along the central axis of the heating device, the length of the flue is greater than the length of the heating layer, and the length of the heating layer is greater than the length of the covering layer; Furthermore, the two ends of the flue tube protrude from the two ends of the heating layer, and the two ends of the heating layer protrude from the two ends of the covering layer.

5. A method for manufacturing a heating device, used to manufacture the heating device as described in any one of claims 1-4, characterized in that, Including the following steps: Prepare a pipe; The heating layer and the covering layer are sequentially wrapped around the outside of the flue; and Fix the coating layer.

6. The method for manufacturing the heating device as described in claim 5, characterized in that, The step of sequentially wrapping the heating layer and the covering layer around the outside of the flue includes: First, wrap the heating layer around the flue, then wrap the covering layer around the heating layer; or First, fix one end of the heating layer to one end of the covering layer, then wrap the fixedly connected heating layer and covering layer sequentially around the flue; or First, the coating layer is applied to the heating layer to form a composite film layer, and then the composite film layer is wrapped around the flue.

7. The method for manufacturing the heating device as described in claim 5, characterized in that, The step of fixing the covering layer includes: The cover layer is secured by using the watch strap fingers to slip over it; or The coating layer is fixed by knotting around its periphery; or The cladding layer is fixed by welding the ends of the cladding layer; or The coating layer is fixed by clamping the end point and the inner side of the coating layer with a pin.

8. An electronic atomizing device, characterized in that, It includes a battery assembly and a heating device as described in any one of claims 1-4, wherein the battery assembly supplies power to the heating device.

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