Heating assembly and aerosol generating device

Abstract

The present application relates to a heating assembly and an aerosol generating device, the heating assembly comprising: a heating part for releasing heat inside an aerosol generating product to make the aerosol generating product generate aerosol; the heating part is of a tubular structure formed by winding, the heating part comprises one or more planar heating layers, and at least one planar heating layer or a heating layer combination formed by multiple planar heating layers is configured to release heat to the periphery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerosol generation technology, in particular to a heating assembly and an aerosol generating device. BACKGROUND

[0002] An aerosol generating device is a device that enables an aerosol generating article to generate an aerosol for a user to draw when heated without combustion. The device includes a heating needle that can be inserted into a substrate inside the aerosol generating article and can heat the substrate inside the aerosol generating article to cause the substrate to generate smoke. However, the heating needle provides heat through heating tracks, which are generally narrow strips with one or more bends, so that there is a blank area between adjacent tracks that is not occupied by a heating layer. The temperature field between the blank area and the heating tracks can be as high as 30℃ or more, resulting in uneven temperature field distribution on the surface of the heating needle, so that the heating needle cannot uniformly heat the substrate, causing the smoke to contain many impurities and affecting the user's smoking experience. SUMMARY

[0003] The purpose of the present application is to provide a heating assembly and an aerosol generating device that can have a relatively uniform temperature field on the outer surface of the heating assembly.

[0004] At least one embodiment of the present application provides a heating assembly, which includes:

[0005] a heating portion for releasing heat inside an aerosol generating article to cause the aerosol generating article to generate an aerosol; the heating portion is a tubular structure wound continuously, and the heating portion includes one or more planar heating layers, wherein at least one of the planar heating layers or a heating layer combination formed by a plurality of the planar heating layers is configured to release heat outwardly.

[0006] As an example, the heating layer combination can release heat outwardly by 360°.

[0007] As an example, the heating portion is configured as a tubular structure wound continuously by more than 360°.

[0008] As an example, the planar heating layer includes a first heating layer, and the heating portion further includes a first electrode layer and a second electrode layer, a portion of the first heating layer overlaps the first electrode layer, and a portion of the first heating layer overlaps the second electrode layer, so that the first heating layer is electrically connected to the first electrode layer and the second electrode layer.

[0009] wherein the continuous winding angle of the portion of the first heating layer between the first electrode layer and the second electrode layer is greater than or equal to 360°.

[0010] As an example, the planar heating layer further comprises a second heating layer, the first heating layer and the second heating layer are arranged in parallel and spaced apart from each other between the first electrode layer and the second electrode layer.

[0011] As an example, the first heating layer and the second heating layer are spaced apart in the longitudinal direction and / or the circumferential direction by less than or equal to 1 mm.

[0012] As an example, the heating part comprises a substrate, the first heating layer is arranged on the substrate, and the substrate is continuously wound at an angle a satisfying: a≥360°.

[0013] As an example, the thickness D of the substrate satisfies: 0.05 mm≤D≤0.35 mm, or 0.1 mm≤D≤0.2 mm; and / or

[0014] The substrate comprises a ceramic tape, or the substrate comprises alumina, zirconia, ZTA, aluminum nitride, silicon nitride, or silicon carbide.

[0015] As an example, the planar heating layer comprises a first heating layer, and the outer surface of the tubular structure comprises a portion of the first heating layer.

[0016] As an example, the heating part further comprises a first electrode layer, the first electrode layer and the first heating layer are arranged on the same surface of the substrate, and the first electrode layer is electrically connected to the first heating layer.

[0017] The outer surface of the tubular structure comprises at least a portion of the first electrode layer.

[0018] As an example, the heating part further comprises a second electrode layer and a second conductive filler, the second electrode layer is arranged on the same surface of the substrate as the first heating layer, and the second electrode layer is electrically connected to the first heating layer; wherein,

[0019] A plurality of second through holes are formed in the substrate, the plurality of second through holes are configured to form channels corresponding to each other after the heating part is wound into a tubular structure, the second conductive filler is filled in the channels, one end of the second conductive filler is exposed on the outer surface of the tubular structure, and the other end of the second conductive filler is electrically connected to the second electrode layer; or

[0020] The tubular structure is a hollow structure, at least one second through hole corresponding to the second electrode layer is formed in the substrate, the second conductive filler is filled in the second through hole, one end of the second conductive filler is exposed on the inner surface of the tubular structure, and the other end of the second conductive filler is electrically connected to the second electrode layer.

[0021] As an example, the planar heating layer comprises a first heating layer, which is hidden inside the tubular structure.

[0022] As an example, the heating portion further comprises a first electrode layer and a second electrode layer, the first electrode layer, the second electrode layer and the first heating layer are arranged on the same surface of the substrate, and the first electrode layer and the second electrode layer are both electrically connected with the first heating layer.

[0023] The first through hole and a plurality of second through holes are formed on the substrate, and the plurality of second through holes are configured to form a channel corresponding to each other after the heating portion is wound into a tubular structure.

[0024] The first through hole is filled with a first conductive filler, one end of the first conductive filler is exposed on the outer surface of the tubular structure, and the other end is electrically connected with the first electrode layer.

[0025] The channel is filled with a second conductive filler, one end of the second conductive filler is exposed on the outer surface of the tubular structure, and the other end is electrically connected with the second electrode layer.

[0026] As an example, the planar heating layer is arranged on the surface or the surface layer of the substrate by printing, spraying, physical deposition, chemical deposition, ion sputtering or particle injection.

[0027] As an example, the substrate comprises a first section and a second section, the planar heating layer is arranged on the first section, and the first section is configured to be located inside the aerosol generating article when the heating assembly is combined with the aerosol generating article.

[0028] The heating assembly further comprises a fixing seat, the second section is embedded in the fixing seat, and the distal end of the planar heating layer is adjacent to the fixing seat.

[0029] As an example, the planar heating layer is rectangular, one of the length in the longitudinal direction and the length in the circumferential direction of the planar heating layer is greater than or equal to 2 mm, and the other is greater than or equal to 5 mm.

[0030] As an example, the heating assembly further comprises a guide portion, the guide portion comprises a substantially conical end cap and a rod portion connected with the distal end of the end cap, the proximal end of the heating portion abuts against the end cap and the tubular structure is arranged around the rod portion.

[0031] The length of the rod portion in the longitudinal direction is less than or equal to the length of the tubular structure in the longitudinal direction.

[0032] As an example, the heating assembly further comprises an emission enhancement layer, which is arranged on the outer surface of the heating portion.

[0033] At least one embodiment of the present application provides a heating assembly, which comprises:

[0034] a heating portion, which is provided with a flow guide channel on the outer surface thereof;

[0035] The heating portion is used to release heat in the interior of the aerosol generating article to make the aerosol generating article generate aerosol, and the flow guide channel is used to guide the air from the outside to flow into the interior of the aerosol generating article along the outer surface of the heating portion to reduce the resistance to draw of the aerosol generating article.

[0036] As an example, one end side of the heating portion is a lap joint edge, the heating portion is configured to form a tubular structure continuously wound more than 360°, and the lap joint edge is located on the outside of the tubular structure and forms a step between the outer surface of the tubular structure, and the step defines at least part of the boundary of the flow guide channel.

[0037] As an example, the heating portion comprises a substrate and a planar heating layer held on the substrate, the substrate is continuously wound at an angle α satisfying: α≥360°, and the planar heating layer comprises a first heating layer, the length of the first heating layer in the circumferential direction is such that the first heating layer is continuously wound in the tubular structure at an angle β satisfying: 360°*0.8≤β≤360°*3, or 360°≤β≤360°*2.

[0038] At least one embodiment of the present application provides an aerosol generating device, which comprises the heating assembly and a power supply assembly, and the power supply assembly is used to provide energy for the heating assembly to release heat.

[0039] The heating assembly and the aerosol generating device provided by the above embodiments, the heating portion of the heating assembly comprises one or more planar heating layers, the planar heating layer has a more uniform temperature field relative to the heating track, thereby being capable of uniformly heating the aerosol generating article and effectively reducing the miscellaneous gas and improving the user's smoking experience. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the specific embodiments of the present application or the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0041] Figure 1is a schematic view of an aerosol generating device provided by some embodiments of the present application;

[0042] Figure 2 is a schematic view of a heating assembly provided by some embodiments of the present application;

[0043] Figure 3 is a schematic view of a heating portion combined with a guide portion provided by some embodiments of the present application;

[0044] Figure 4 is a sectional view of a heating portion separated from a guide portion provided by some embodiments of the present application;

[0045] Figure 5 is a sectional view of a heating portion combined with a guide portion provided by some other embodiments of the present application;

[0046] Figure 6 is a schematic view of a heating portion provided by some embodiments of the present application;

[0047] Figure 7 is an expanded schematic view of a heating portion provided by some embodiments of the present application;

[0048] Figure 8 is an expanded schematic view of a heating portion provided by some other embodiments of the present application;

[0049] in the figure:

[0050] 100, aerosol generating device; 200, aerosol generating article;

[0051] 1, heating assembly; 11, heating portion; 111, flow guide channel; 112, heating layer; 113, substrate; 1131, overlapping edge; 1132, hidden edge; 114, first electrode layer; 115, second electrode layer; 116, second through hole; 117, cavity; 12, fixing seat; 118, blank area; 1191, first section; 1192, second section; 13, guide portion; 131, end cap; 132, rod portion;

[0052] 2, power supply assembly; 21, power supply; 22, circuit board. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0054] The terms "first", "second", "third", etc., are used herein only to describe the purpose of the embodiments, and cannot be understood as indicating or implying relative importance or implicitly indicating the number or order of the technical features indicated. All directional indications (such as upper, lower, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship or movement between the components, and if the specific posture changes, the directional indications will also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0055] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood that the embodiments described herein can be combined with other embodiments.

[0056] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0057] Please refer to Figure 1 Some embodiments of the present application provide a heating assembly 1 and an aerosol generating device 100 including the same, which can be used in combination with an aerosol generating article 200, so that the aerosol generating article 200 generates an aerosol.

[0058] The aerosol generating article 200 can include a mouthpiece, a connecting section, and an aerosol generating substrate section capable of generating an aerosol. The connecting section is located between the mouthpiece and the aerosol generating substrate section, and is used to guide the aerosol to the mouthpiece. The mouthpiece can be held by the user's mouth, and the user can suck the aerosol by sucking the mouthpiece.

[0059] In the aerosol generating substrate section in the aerosol generating article 200, there can be an aerosol generating substrate.

[0060] As used herein, the term "aerosol-generating substrate" refers to a substrate capable of releasing volatile substances to form an inhalable aerosol therefrom. The aerosol-generating substrate can comprise a tobacco-containing material, which contains volatile tobacco flavour compounds that are released from the substrate upon heating. In particular, the aerosol-generating substrate can be a tobacco-containing aerosol-generating substrate, preferably a solid tobacco-containing aerosol-generating substrate. Alternatively, the aerosol-generating substrate can comprise a non-tobacco material. The aerosol-generating substrate can further comprise an aerosol former. Examples of suitable aerosol formers are glycerol and propylene glycol.

[0061] Optionally, the aerosol-generating substrate can contain additional tobacco or non-tobacco volatile flavour compounds that are released upon heating of the aerosol-generating substrate. The aerosol-generating substrate can further contain micro-encapsulations, for example containing additional tobacco or non-tobacco volatile flavour compounds, and such micro-encapsulations can melt during heating of the solid aerosol-generating substrate.

[0062] The aerosol-generating article 200 can be generally a rod-like structure extending in a longitudinal direction. The mouthpiece can be provided adjacent to a proximal end of the aerosol-generating article 200. The aerosol-generating substrate segment can be provided adjacent to a distal end of the aerosol-generating article 200.

[0063] It is noted that the aerosol-generating article 200 can optionally include the mouthpiece and the connecting segment. In some embodiments, the aerosol-generating article 200 can only include the aerosol-generating substrate segment capable of generating an aerosol, in which case the aerosol-generating device 100 can include a mouthpiece assembly for a user to puff on.

[0064] The heating assembly 1 is configured to release heat to the aerosol-generating article 200, so that the aerosol-generating substrate generates volatile substances, which combine with air flowing into the aerosol-generating substrate to form an aerosol. The air flowing into the aerosol-generating substrate and the aerosol generated by the aerosol-generating substrate can pass out of the proximal end of the aerosol-generating substrate and be drawn into the user's mouth.

[0065] In some embodiments, the heating assembly 1 includes a heating portion 11, which can include an internal heating portion, an external heating portion, and / or an air heating portion.

[0066] The internal heating portion refers to a heating portion that, when the aerosol-generating device 100 is used in combination with the aerosol-generating article 200, is at least partially located inside the aerosol-generating substrate, so as to be capable of heating the aerosol-generating substrate internally.

[0067] The external heating portion refers to a heating portion provided outside the aerosol generating substrate when the aerosol generating device 100 is used in combination with the aerosol generating article 200, and thus can heat the aerosol generating substrate externally. For example, the external heating portion can be substantially tubular and can be provided to surround at least a portion of the aerosol generating article 200. Alternatively, for example, the external heating portion can support a bottom or a distal end of the aerosol generating article 200, and thus can heat the bottom or the distal end of the aerosol generating article 200.

[0068] The air heating portion refers to a heating portion provided upstream of the aerosol generating article 200 in the airflow direction, and thus can heat the airflow passing therethrough to form a high-temperature airflow, and then the high-temperature airflow can flow into the aerosol generating substrate to heat the aerosol generating substrate using the high-temperature airflow.

[0069] In the embodiment shown in FIG. 1, the heating portion 11 is an internal heating portion. Figure 1

[0070] The heating assembly 1 can be an electric heating assembly that can convert electromagnetic energy or electric energy into heat. In some embodiments, the aerosol generating device 100 includes a power supply assembly 2 for supplying electromagnetic energy or electric energy to the heating assembly.

[0071] The power supply assembly 2 can include a power supply 21 and a circuit board 22. The power supply 21 can include any suitable battery, for example, the power supply 21 can include a lithium battery. The circuit board 22 is electrically connected to the power supply 21 and the heating assembly 1, and the circuit board 22 can control the electric power output from the power supply 21 to the heating assembly 1.

[0072] The heating portion 11 can include a resistive material, an infrared coating, and / or a susceptor.

[0073] The resistive material can generate Joule heat when an electric current flows therethrough, and the resistive material can heat the aerosol generating article mainly by thermal conduction. Suitable resistive materials include, but are not limited to, semiconductors such as doped ceramics, conductive ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, metal alloys, and composite materials made of ceramic and metallic materials. Such composite materials can include doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, Constantan, nickel-containing alloys, cobalt-containing alloys, chromium-containing alloys, aluminum-containing alloys, titanium-containing alloys, zirconium-containing alloys, hafnium-containing alloys, niobium-containing alloys, molybdenum-containing alloys, tantalum-containing alloys, tungsten-containing alloys, tin-containing alloys, gallium-containing alloys, manganese-containing alloys, and iron-containing alloys, as well as nickel-, iron-, and cobalt-based superalloys, stainless steel, iron-aluminum-based alloys, and iron-manganese-aluminum-based alloys.

[0074] ​The infrared coating is capable of radiating infrared light when excited by heat or by an electric current passing through it. The infrared coating can heat the aerosol generating substrate primarily by thermal radiation. The infrared coating can radiate infrared light having a wavelength of 0.75 μm to 1000 μm, preferably far infrared light having a wavelength of 1.5 μm to 400 μm, and more preferably far infrared light having a wavelength of 4 μm to 15 μm.

[0075] As used herein, the term "susceptor" refers to a material that can convert electromagnetic energy into heat. An eddy current induced in the susceptor when located within a varying electromagnetic field causes heating of the susceptor. In such embodiments, the susceptor is designed to interface with a power supply assembly that includes a magnetic field generator. The magnetic field generator generates a varying magnetic field to heat the susceptor located within the varying magnetic field. In use, the susceptor is located within the varying magnetic field generated by the magnetic field generator. The magnetic field generator is electrically connected to a power supply assembly that provides the magnetic field generator with an electrical current to generate the varying magnetic field. The magnetic field generator can include one or more induction coils that generate the varying magnetic field, which can surround the susceptor. In an embodiment, the aerosol-generating device is capable of generating a varying magnetic field between 1 MHz and 30 MHz, such as between 2 MHz and 10 MHz, such as between 5 MHz and 7 MHz. In an embodiment, the aerosol-generating device is capable of generating a varying magnetic field having a field strength (H-field) between 1 and 5 kA / m, such as between 2 kA / m and 3 kA / m, such as about 2.5 kA / m.

[0076] The susceptor can include a metal or carbon. In an embodiment, the susceptor can include a ferromagnetic material, such as ferrite, ferromagnetic steel, or stainless steel. In an embodiment, the susceptor includes a nickel-iron alloy. In an embodiment, the susceptor includes a 400 series stainless steel, which includes a 410 grade or a 420 grade or a 430 grade stainless steel.

[0077] It should be noted that "a plurality of", as described in the present application, refers to a quantity of two or more.

[0078] In some embodiments, reference can be made to Figure 2 and Figure 3 The inner heating portion 11 is provided with a flow guide channel 111 on the outer surface thereof, the flow guide channel 111 being configured to guide ambient air to flow along the outer surface of the inner heating portion into the aerosol generating article 200, so that the ambient air can pass through the aerosol generating article 200 near the heating portion from the flow guide channel 111.

[0079] The presence of the flow guide channels 111 makes the outer surface of the heating portion 11 have concave, convex or stepped, and the size of the "concave", "convex" or "stepped" is small, so as to prevent the filament (such as tobacco filament), leaf (such as tobacco leaf), particle (such as tobacco particle) or strip (such as tobacco strip) in the aerosol generating substrate from filling the "concave" or "stepped", thereby blocking the flow guide channels 111.

[0080] When the distance between the peak point and the valley point of the outer surface of the heating portion in the transverse direction is greater than 1 mm, or the depth of the groove on the outer surface of the heating portion is greater than 1 mm, or the height of the step on the outer surface of the heating portion is greater than 1 mm, the channel or space defined by the "concave", "convex" or "stepped" on the outer surface of the heating portion does not belong to the flow guide channel described in the present application.

[0081] In some embodiments, the distance between the peak point and the valley point of the outer surface of the heating portion 11 in the transverse direction, or the height of the step on the outer surface of the heating portion 11 can be between 0.05 mm and 0.35 mm, preferably between 0.1 mm and 0.2 mm, or between 0.05 mm and 0.2 mm, or between 0.1 mm and 0.2 mm. Thus, the flow guide channels 111 are formed on the outer surface of the heating portion 11.

[0082] After the inner heating portion 11 is inserted into the aerosol generating article 200, the aerosol generating substrate is extruded, so that the closer the aerosol generating substrate is to the heating portion 11, the greater the density of the aerosol generating substrate, the smaller the gap between the aerosol generating substrates, and the more difficult it is for the outside air to enter and pass through the aerosol generating substrate.

[0083] In the present application, during smoking, the outside air can first enter the flow guide channels 111, and then the air enters the aerosol generating substrate in the transverse direction, so that the aerosol generating substrate has a larger air inlet area; finally, the air and the aerosol pass through the aerosol generating substrate from the top or proximal end of the aerosol generating substrate. The air flow path is shorter than that of the outside air directly entering the aerosol generating substrate from the bottom or distal end of the aerosol generating substrate, and then passing through the aerosol generating substrate from the top or proximal end of the aerosol generating substrate. And has a larger air inlet area. Thus, the outside air can more easily and in larger quantities enter the aerosol generating substrate close to the heating portion, thereby effectively reducing the resistance. At the same time, the volatile substances generated by the aerosol generating substrate close to the heating portion 11 can be combined with sufficient air, thereby increasing the amount of aerosol generated. Therefore, the user's smoking experience can be effectively improved.

[0084] The longitudinal distance between the proximal end and the distal end of the flow guide passage 111 can be between 8 mm and 15 mm, so that the flow guide passage 111 can guide the external air into the depth of the aerosol generating substrate between 8 mm and 15 mm. In some embodiments, the longitudinal distance between the proximal end and the distal end of the flow guide passage 111 can be equal to the length of the heating portion 11 in the longitudinal direction.

[0085] In some embodiments, one side of the heating portion 11 is a lap edge 1131, the heating portion 11 is continuously wound over 360° to form a tubular structure, and the lap edge 1131 is located on the outside of the tubular structure and forms a step between the outer surface of the tubular structure. The step forms the flow guide passage 111 on the outer surface of the heating portion 11. In other words, the step can define at least part of the boundary of the flow guide passage 111.

[0086] Reference can be made to Figure 7 and Figure 8 The heating portion 11 is in a sheet structure when unfolded, the sheet structure forms the heating portion 11 of the tubular structure after being continuously wound, and one side of the sheet structure (the lap edge 1131) is lapped on the outside of the tubular structure after the sheet structure is continuously wound, and the lap edge 1131 and the outer surface of the tubular structure adjacent to the lap edge 1131 form the step.

[0087] In some embodiments, the heating portion 11 includes a substrate 113 and a heating layer 112 held on the substrate 113, and the heating layer 112 can be wound together with the substrate 113. In some embodiments, the lap edge 1131 can be a part of the substrate 113. The substrate 113 can be continuously wound at an angle α that satisfies: α > 360°.

[0088] The substrate 113 can have a small thickness, so that the substrate 113 can be continuously wound over 360°. In some embodiments, the thickness D of the substrate satisfies: 0.05 mm ≤ D ≤ 0.35 mm. Preferably, the thickness D of the substrate satisfies: 0.05 mm ≤ D ≤ 0.2 mm, or 0.1 mm ≤ D ≤ 0.2 mm. Therefore, the height of the step formed by the lap edge 1131 on the outer surface of the tubular structure can be approximately D, or the size of part of the boundary of the flow guide passage 111 can be approximately D. In other words, the height of the step formed by the lap edge 1131 on the outer surface of the tubular structure, or the size of part of the boundary of the flow guide passage 111, can be between 0.05 mm and 0.35 mm, and preferably can be between 0.1 mm and 0.2 mm.

[0089] The thickness of the heating layer 112 can be smaller than the thickness of the substrate 113, so that the heating layer 112 can be bent. The thickness of the heating layer 112 can be between 1 μm and 50 μm.

[0090] The heating layer 112 can include a resistive material, an infrared coating, and / or a susceptor.

[0091] The heating layer 112 can be formed on the surface of the substrate 113 by printing or spraying, etc. The heating layer 112 can be formed on the surface or in the surface of the substrate 113 by physical deposition, chemical deposition, ion sputtering, or particle injection, etc. The heating layer 112 can also be formed by bonding, welding, or insert molding, etc.

[0092] The substrate 113 can be made of a high-temperature-resistant insulating material to prevent the substrate 113 from being damaged by the heat released by the heating layer 112. The substrate 113 can include a ceramic flow sheet containing ceramic components, so that the substrate 113 can resist high temperature. The substrate or the ceramic components can include alumina, zirconia, ZTA (zirconia toughened alumina ceramic), aluminum nitride, silicon nitride, or silicon carbide.

[0093] When the substrate 113 includes a ceramic flow sheet, the manufacturing process of the heating section 11 can be roughly as follows: (1) arranging the heating layer 112 on the sheet-shaped flow sheet; (2) winding the sheet-shaped flow sheet, which can make the winding angle of the flow sheet exceed 360°, so that the side edges of the outer side of the flow sheet are lap edges, which lap on the side wall of the rod-shaped structure formed by winding the flow sheet; (3) using an isostatic pressing process to make the lap edges adhere to the side wall of the rod-shaped structure, and to make the adjacent two layers of the flow sheet in the rod-shaped structure adhere to each other, so as to roughly shape the rod-shaped structure; (4) sintering the rod-shaped structure at high temperature to sinter the flow sheet in the rod-shaped structure into porcelain.

[0094] Of course, the substrate 113 can also include a metal sheet and an insulating layer arranged on the surface of the metal sheet. The insulating layer can be an oxide layer formed by the metal in the metal sheet. The insulating layer can be an insulating layer formed by an insulating material coated on the surface of the metal.

[0095] In some embodiments, the heating layer 112 includes a planar heating layer. The "planar heating layer" described in this application is obviously different from a track-shaped heating layer. The track-shaped heating layer is roughly a linear structure or a narrow strip structure with one or more bends, so that there is a blank area between at least two tracks on the track-shaped heating layer, and the blank area is an area on the substrate that is not covered by the heating layer. For convenience of statement, it is defined that the area on the substrate covered by the heating layer is a covered area.

[0096] When the heating layer on the substrate is a planar heating layer, there is no blank area between the edges of the planar heating layer at opposite ends or there is a blank area with a small area ratio. When the heating assembly is combined with the aerosol generating article, the heating layer is mainly located in the aerosol generating article. Therefore, compared with a track-shaped heating layer, the heating portion with a planar heating layer can heat the aerosol generating substrate more uniformly.

[0097] The planar heating layer can be polygonal, preferably the planar heating layer is substantially rectangular, and more preferably the length of the rectangle in the longitudinal direction and the length of the rectangle in the circumferential direction are one of which is greater than or equal to 2 mm and the other of which is greater than or equal to 5 mm. Of course, the planar heating layer can also be substantially circular or elliptical.

[0098] In some embodiments, the planar heating layer can be referred to as a first heating layer. Figure 6 and Figure 7 The heating layer 112 includes a planar first heating layer 1121, and the length of the first heating layer 1121 in the circumferential direction is such that the angle β of the first heating layer 1121 continuously wound in the tubular structure satisfies: 360°*0.8≤β≤360°*3. Preferably, the angle β satisfies: 360°≤β≤360°*2.

[0099] When β≥360°, the region on the heating portion 11 corresponding to the first heating layer 1121 can release heat to the aerosol generating article 200 around the periphery of the region for 360°.

[0100] When β=N*360° and the first heating layer 1121 is a planar heating layer, the region on the heating portion 11 corresponding to the first heating layer 1121 can release substantially the same amount of heat to the aerosol generating article 200 around the periphery of the region for 360°, thereby enabling the aerosol generating article 200 to be heated more uniformly, where N is an integer greater than 0 and N is used to represent the number of layers of the first heating layer 1121 wound in the tubular structure. When N>1, the first heating layer 1121 is wound so that the first heating layer 1121 is stacked in the transverse direction by N layers, i.e., more than two layers, so that the region on the heating portion 11 corresponding to the first heating layer 1121 can release heat to the aerosol generating article 200 around the periphery of the region for 360°, which is approximately N*Q, where Q is the amount of heat released by the first heating layer 1121 at the working voltage or current. Therefore, the greater N is, the higher the heating efficiency of the heating portion 11 is, but it also results in a larger transverse dimension of the heating portion 11. Therefore, it is preferred that 1≤N≤2, and therefore 360°≤β≤360°*2. When the first heating layer 1121 is a planar heating layer, it is helpful to make the heat distribution of each of the N layers uniform.

[0101] In some embodiments, the heating layer 112 has a plurality of M heating layers 112 in the plurality of heating layers 112 arranged sequentially in the circumferential direction, such that the heating layer combination formed by the M heating layers 112 is capable of releasing heat 360° outward in the tubular structure, and M is an integer greater than 1. Each of the M heating layers 112 has a winding angle in the tubular structure less than 360°.

[0102] For example, M = 2, the winding angle of the substrate 113 in the tubular structure is 720°, such that the substrate 113 is wound into two layers, each layer of the substrate 113 is arranged with one of the two heating layers 112, and at least a part of the two heating layers in the tubular structure are arranged complementarily staggered in the circumferential direction, so that the heating part 11 is capable of releasing heat 360° outward. The winding angle of the two heating layers 112 can be greater than or equal to 180°. Alternatively, the winding angle of one of the two heating layers 112 can be greater than 180°, and the winding angle of the other heating layer 112 can be less than 180°.

[0103] In some embodiments, the heating layer 112 can be arranged on the substrate 113 in the following manner: Figure 6 and Figure 7 The heating layer 112 includes a first heating layer 1121, and the outer surface of the tubular structure includes a part of the first heating layer 1121.

[0104] In a typical example, the first heating layer 1121 is arranged on only one surface of the substrate 113, and in the formed tubular structure, a part of the first heating layer 1121 is exposed, so that the first heating layer 1121 constitutes at least part of the outer surface of the tubular structure.

[0105] In this example, the substrate 113 can be bent towards the direction of the surface of the substrate 113 on which the first heating layer 1121 is not arranged, and then continuously wound more than 360°, so that a part of the first heating layer 1121 is exposed on the outside of the tubular structure.

[0106] When the first heating layer 1121 comprises a resistance material or an infrared coating, the heating part 11 further comprises a first electrode layer 114, which can be arranged on the same surface of the substrate 113 as the heating layer 112 and electrically connected to the heating layer 112. Due to the partial exposure of the first heating layer 112 and the exposed part of the first heating layer 112 constituting at least part of the outer surface of the tubular structure, the first electrode layer 114 can be connected to the exposed part of the first heating layer 112 so that at least part of the first electrode layer 114 is also exposed on the outside of the tubular structure or so that the outer surface of the tubular structure also comprises at least part of the first electrode layer 114. The exposed part of the first electrode layer 114 can be soldered with a first lead wire so that the first electrode layer 114 can be electrically connected to the power supply assembly 2 through the first lead wire. The exposed part of the first electrode layer 114 can be in abutment with the first conductive terminal or the first metal spring so that the first electrode layer 114 can be electrically connected to the power supply assembly 2 through the first conductive terminal or the first metal spring.

[0107] In the embodiment shown in Figure 6 and Figure 7 , the first electrode layer 114 is arranged adjacent to the overlapping edge 1131 of the substrate 113.

[0108] The first electrode layer 114 has a resistivity smaller than that of the first heating layer 112. The first electrode layer 114 can be formed on the surface of the substrate 113 by printing or spraying of electrode paste and the like. The first electrode layer 114 can be formed on the surface or the surface layer of the substrate 113 by physical deposition, chemical deposition, ion sputtering or particle injection of metal elements or conductive elements. The first electrode layer 113 can also be a copper foil, a silver foil or a gold foil bonded, soldered or insert-molded with the substrate 113. The electrode paste can comprise silver paste.

[0109] The first electrode layer 114 can be arranged on the substrate 113 first, and then the first heating layer 1121 is arranged on the substrate 113, so that the first heating layer 1121 partially covers part of the first electrode layer 114, thereby electrically connecting the first heating layer 1121 to the first electrode layer 114 and exposing part of the first electrode layer 114.

[0110] Alternatively, with reference to Figure 6 and Figure 7 , the first heating layer 1121 can be arranged on the substrate 113 first, and then the first electrode layer 114 is arranged on the substrate 113, so that part of the first electrode layer 114 covers part of the first heating layer 1121, thereby electrically connecting the first heating layer 1121 to the first electrode layer 114 and exposing all of the first electrode layer 114.

[0111] The first heating layer 1121 comprising resistive material or infrared coating needs to be electrically connected with the at least two electrode layers 114, therefore, the heating section 11 further comprises a second electrode layer 115. The second electrode layer 115 is arranged apart from the first electrode layer 114, and the second electrode layer 115 is electrically connected with the first heating layer 1121. The second electrode layer 115 can be arranged on the same surface of the substrate 113 as the first heating layer 1121, and the first electrode layer 114 and the second electrode layer 115 can be connected on opposite sides of the first heating layer 1121. The second electrode layer 115 can be made of the same material or by the same process as the first electrode layer 114.

[0112] Since the substrate 113 is continuously wound over 360°, the other side edge of the substrate 113 (referred to as hidden edge 1132) opposite to the lap edge 1131 is located inside the tubular structure and thus is hidden. The second electrode layer 115 can be closer to the hidden edge 1132 of the substrate 113 relative to the first electrode layer 114. In the tubular structure, the second electrode layer 115 is hidden.

[0113] In order to enable the second electrode layer 115 to be electrically connected with the power supply assembly 2, please refer to Figure 7 and Figure 8 A plurality of second through holes 116 can be formed on the substrate 113, and the heating section 11 can further comprise a second conductive filler (not shown). The plurality of second through holes 116 are configured to form channels corresponding to each other after the heating section 11 is wound into a tubular structure, the second conductive filler is filled in the channels, and one end of the second conductive filler is exposed on the outer surface of the tubular structure, so that the second lead wire, the second conductive terminal or the second metal spring can be electrically connected with the second conductive filler on the outside of the heating section 11, and the other end of the second conductive filler is electrically connected with the second electrode layer 115. The second conductive filler can be formed by curing electrode paste, and the electrode paste can be injected, sprayed or printed to flow along the channels to contact the second electrode layer 115 and fill the channels. In this example, the second conductive filler can be arranged after the tubular structure is formed.

[0114] Alternatively, the tubular structure is a hollow structure, the tubular structure has a cavity 117 inside, the substrate 113 has at least one second through hole 116 corresponding to the second electrode layer 115, and the second conductive filler is filled in the second through hole 116, and one end of the second conductive filler is exposed on the inner surface of the tubular structure, so that the second lead wire, the second conductive terminal or the second metal spring can be electrically connected with the second conductive filler inside the heating part 11, and the other end of the second conductive filler is electrically connected with the second electrode layer 115. In this example, if there are a plurality of second through holes 116, the plurality of second through holes 116 can be arranged corresponding to different positions of the second electrode layer 115. Preferably, in this example, there is only one second through hole 116. In this example, the second conductive filler can be arranged in the second through hole 116 when the substrate 113 is a flat sheet structure or an expanded sheet structure.

[0115] The second electrode layer 115 can be arranged adjacent to the hidden edge 1132 of the substrate.

[0116] In another typical example, the heating layer 112 has a plurality of first heating layers 1121, and the first heating layer 1121 is arranged on the first surface of the substrate 113, and at least one other heating layer 112 is arranged on the second surface of the substrate 113 opposite to the first surface. Thus, in the formed tubular structure, the first heating layer 1121 is partially exposed on the outside of the tubular structure, and the at least one other heating layer 112 is hidden inside the tubular structure.

[0117] In some embodiments, referring to Figure 6 and Figure 7 , the first heating layer 1121 is partially overlapped with the first electrode layer 114 and the second electrode layer 115, so that the first heating layer 1121 is electrically connected with the first electrode layer 114 and the second electrode layer 115; wherein the continuous winding angle of the part of the first heating layer 1121 between the first electrode layer 114 and the second electrode layer 115 is greater than or equal to 360°.

[0118] In some embodiments, referring to Figure 4 , the heating layer 112 includes the first heating layer 1121. The inner surface of the tubular structure includes the part of the first heating layer 1121. Alternatively, the first heating layer 1121 is hidden inside the tubular structure.

[0119] When the first heating layer 1121 comprises an electrically resistive material or an infrared coating, the heating section 11 further comprises a first electrode layer 114 and a second electrode layer 115, which are spaced apart and electrically connected to the first heating layer 112. Preferably, the first electrode layer 114 and the second electrode layer 115 are also hidden inside the tubular structure. The first electrode layer 114 can be closer to the outer surface of the tubular structure than the second electrode layer 115. The first electrode layer 114 can be arranged inside the outermost substrate 113 in the tubular structure. The first electrode layer 114 can be arranged adjacent to the overlapping edge 1131 of the substrate 113 and inside the substrate 113 in the tubular structure.

[0120] To enable the second electrode layer 115 to be electrically connected to the power supply assembly 2, the substrate 113 can be provided with a first through hole (not shown) and a plurality of second through holes 116, which can correspond to each other after the heating section 11 is wound into a tubular structure to form a channel. The first through hole can be filled with a first conductive filler, one end of which is exposed on the outer surface of the tubular structure, so that the first lead wire, the first conductive terminal or the first metal spring can be electrically connected to the first conductive filler on the outside of the heating section 11, and the other end of the first conductive filler is electrically connected to the first electrode layer 114. The channel can be filled with a second conductive filler, one end of which is exposed on the outer surface of the tubular structure, so that the second lead wire, the second conductive terminal or the second metal spring can be electrically connected to the second conductive filler on the outside of the heating section 11, and the other end of the second conductive filler is electrically connected to the second electrode layer 115.

[0121] In some embodiments, the heating section 11 can comprise a plurality of heating layers 112, which are spaced apart and arranged in parallel between the first electrode layer 114 and the second electrode layer 115. Each of the plurality of heating layers 112 can be a planar heating layer. Figure 8

[0122] The plurality of heating layers 112 can be arranged on the same surface of the substrate 113. The plurality of heating layers 112 arranged on the same surface of the substrate 113 are spaced apart from each other to adjust the temperature field of the heating section 11 through the spacing to prevent excessive heat concentration at a certain position on the heating section 11 from causing excessively high temperature.

[0123] ​Specifically, the heating assembly 1 may further include a mounting base 12 and a guide portion 13. The heating portion 11 includes a heating zone and a mounting zone. The heating layer 112 is mainly arranged on the heating zone, and the mounting zone connects the heating zone and the mounting base 12. The mounting base 12 can absorb heat from the mounting zone through heat conduction, resulting in a lower temperature at locations further away from the heating zone, and the temperature at the far end of the heating zone is lower than the temperature in the middle region of the heating zone. The guide portion 13 includes a generally conical end cap 131, which is connected to the proximal end of the heating portion 11. The end cap 131 can guide the heating assembly 1 into the aerosol generating article 200. The end cap 131 does not have a heating layer 121 arranged on it, so the temperature on the end cap 131 is lower than the temperature of the heating zone. The end cap 131 can also absorb heat from the proximal end of the heating zone through heat conduction, resulting in a lower temperature at the proximal end of the heating zone than the temperature in the middle region of the heating zone. Therefore, without intervention, the temperature in the middle region of the heating zone in the heating assembly 1 may be too high.

[0124] In some embodiments of this application, reference can be made to Figure 8 This arrangement ensures that multiple planar heating layers 121 do not overlap and are spaced apart in the longitudinal and / or circumferential directions, which can reduce the highest temperature in the middle region of the heating zone and help to make the temperature distribution in the heating zone more uniform, thereby enabling more uniform heating of the aerosol-generated product 200.

[0125] The spacing between two adjacent planar heating layers 112 in the longitudinal and / or circumferential directions can be less than or equal to 1 mm, for example, the spacing can be 0.5 mm, to prevent the average temperature on the heating area from being too low and to prevent the temperature difference between the covered area and the blank area 118 on the heating area from being too large.

[0126] In such Figure 8 In the illustrated embodiment, multiple parallel-connected planar heating layers 112 are arranged on the same surface of the substrate 113. Two of these planar heating layers are defined as a first heating layer 1121 and a second heating layer 1122, respectively, such that the first heating layer 1121 and the second heating layer 1122 have the same operating voltage. The second heating layer 1122 is disposed between the first heating layer 1121 and the mounting area. The heating power of the first heating layer 1121 can be made greater than that of the second heating layer 1122 by making the resistance value of the first heating layer 1121 less than the resistance value of the second heating layer 1122.

[0127] The scheme of making the resistance value of the first heating layer 1121 less than the resistance value of the second heating layer 1122 includes but is not limited to: (1) in the direction of the current, the length of the first heating layer 1121 is substantially equal to the length of the second heating layer 1122, but in the direction perpendicular to the current, the length of the first heating layer 1121 is greater than the length of the second heating layer 1122; (2) the thickness of the first heating layer 1121 is greater than the thickness of the second heating layer 1122; (3) in the direction of the current, the length of the first heating layer 1121 is less than the length of the second heating layer 1122, for example, the continuous winding angle of the first heating layer 1121 is 360°, and the continuous winding angle of the second heating layer 1122 is 720°; and / or (3) the resistivity of the first heating layer 1121 is less than the resistivity of the second heating layer 1122.

[0128] One of the plurality of planar heating layers 112 can also be a third heating layer 1123, which is arranged between the second heating layer 1122 and the mounting area. The first heating layer 1121, the second heating layer 1122 and the third heating layer 1123 can be arranged in parallel between the first electrode layer 114 and the second electrode layer 115. The resistance value of the second heating layer 1122 can be less than or equal to the resistance value of the third heating layer 1123.

[0129] It should be noted that when there are multiple planar heating layers 112, the multiple planar heating layers 112 can be arranged in series on the same surface of the substrate 113, or some of the multiple planar heating layers 112 can be connected in series with each other, and some of the multiple planar heating layers 112 can be connected in parallel with each other.

[0130] It should be noted that when there are multiple planar heating layers 112, the electrode layer of the heating part 11 can be more than two, for example, it can also include a third electrode layer (not shown), and each planar heating layer 112 is electrically connected to at least two electrode layers.

[0131] It should be noted that when there are multiple planar heating layers 112, some of the planar heating layers 112 can be arranged on the first surface of the substrate 113, and some of the planar heating layers 112 can be arranged on the second surface of the substrate 113.

[0132] In some embodiments, the substrate 113 includes a first section 1191 arranged corresponding to the heating area of the heating part 11 and a second section 1192 arranged corresponding to the mounting area of the heating part 11, and the heating layer 112 is arranged on the first section 1191, and the second section 1192 is a blank area. The second section 1192 is used to connect with the fixing seat 12, so that the heating part 11 can be fixed on the fixing seat 12 substantially vertically.

[0133] In the prior art, the second section is partially embedded in the fixing seat and partially outside the fixing seat, so that when the heating assembly is combined with the aerosol generating article, the second section is partially located in the aerosol generating article, and when the heating assembly is working, the temperature of the second section is significantly lower than the temperature of the first section because no heating layer is arranged on the second section and the fixing seat can absorb the temperature of the second section. Therefore, the distal end or the bottom of the aerosol generating article cannot be heated sufficiently.

[0134] Based on this, in some embodiments of the present application, the second section 1192 is embedded in the fixing seat 12, and the distal end of the heating layer 112 is adjacent to the fixing seat 12. When the heating assembly 1 is combined with the aerosol generating article 200, the heating layer 112 corresponds to the bottom or the distal end of the aerosol generating article 200, so that the bottom or the distal end of the aerosol generating article 200 can be heated sufficiently. Specifically, when there is only one heating layer 112, the distal end of the heating layer 112 is located at the boundary line 1a between the heating area and the mounting area; when there are multiple heating layers 112, the distal end of the heating layer 112 closest to the distal end of the substrate 113 is located at the boundary line 1a between the heating area and the mounting area. The boundary line 1a is arranged adjacent to the fixing seat 12. The boundary line 1a can be in the same plane as the proximal end of the fixing seat 12. The longitudinal distance between the boundary line 1a and the fixing seat 12 is less than 1 mm.

[0135] In some embodiments, with reference to Figure 8 , the first electrode layer 114 extends longitudinally, and the first electrode layer 114 is arranged on the first section 1191 on the substrate 113 and on the second section 1192 on the substrate 113. The first wire, the first conductive terminal or the first metal spring is electrically connected to the second section 1192 and the first electrode layer 114.

[0136] The second electrode layer 115 can extend longitudinally, and the second electrode layer 115 is arranged on the first section 1191 on the substrate 113 and on the second section 1192 on the substrate 113. The second wire, the second conductive terminal or the second metal spring is electrically connected to the second section 1192 and the second electrode layer 115.

[0137] In some embodiments, with reference to Figure 4 and Figure 5 , the guide part 13 further comprises a rod part 132 connected to the distal end of the end cap 131, and the proximal end of the heating part 11 abuts against the end cap 131 and the tubular structure is arranged around the rod part 132. The rod part 132 helps to fix the guide part 13 on the heating part 11. The rod part 132 can abut against the tubular structure in the transverse direction.

[0138] Please refer to Figure 3 and Figure 5The proximal end of the overlapping edge 1131 abuts against the distal end of the end cap 131, so that the flow guide passage 111 can guide the air from the outside to the position where the distal end of the end cap 131 is located.

[0139] The longitudinal distance between the proximal end of the end cap 131 and the distal end of the heating portion 11 can be greater than the length of the aerosol generating substrate in the longitudinal direction. The total length of the one or more heating layers 112 on the heating portion 11 in the longitudinal direction can be substantially equal to the longitudinal distance between the proximal end of the end cap 131 and the fixing seat 12. The longitudinal distance between the proximal end of the end cap 131 and the fixing seat 12 can be substantially equal to the length of the aerosol generating substrate in the longitudinal direction.

[0140] The length of the first heating layer 1121 on the heating portion 11 in the longitudinal direction can be between 2 mm and 15 mm, for example, 2 mm, 5 mm, 8 mm, 9 mm, 10 mm, 11 mm, 13 mm, or 15 mm. Preferably, the length of the first heating layer 1121 on the heating portion 11 in the longitudinal direction is between 5 mm and 11 mm.

[0141] In some embodiments, the rod portion 132 can have a length in the longitudinal direction that is less than the length of the tubular structure in the longitudinal direction, so that the interior of the tubular structure has a cavity 117. Figure 4

[0142] In some embodiments, the rod portion 132 can have a length in the longitudinal direction that is equal to the length of the tubular structure in the longitudinal direction, so that the interior of the tubular structure is solid. Figure 5

[0143] The guide portion 13 can be made of ceramic. The guide portion 13 and the substrate 113 can be made of the same material. The rod portion 132 can be a solid structure or at least partially hollow.

[0144] In some embodiments, the heating assembly 1 further comprises an emission enhancement layer (not shown) disposed on the surface of the heating portion 11. The emission enhancement layer is used to improve the emissivity of the heating portion 11 to release heat, which is beneficial to transfer at least part of the heat of the heating portion 11 to the aerosol generating article 200 in the form of radiation, thereby improving the heating effect on the aerosol generating article 200. The emission enhancement layer can include a glaze with high emissivity.

[0145] It should be noted that the heating portion 11 including the substrate 113 is optional and not mandatory. In some embodiments, the heating portion 11 includes the heating layer 112, but does not include the substrate 113, and the heating layer 112 can be vertically fixed on the fixing seat 12. For example, the heating layer 113 can be made of conductive ceramic.

[0146] ​​It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

Claims

1. A heating assembly, characterized by, The heating portion is a tubular structure wound continuously over 360°, and the heating portion comprises one or more planar heating layers, wherein at least one of the planar heating layers or a heating layer combination formed by a plurality of the planar heating layers is configured to release heat outwardly. The heating layer combination can release heat outwardly by 360°. The heating portion is a tubular structure wound continuously over 360°.

2. The heating assembly of claim 1, wherein, The planar heating layer comprises a first heating layer, and the heating portion further comprises a first electrode layer and a second electrode layer, a part of the first heating layer overlaps with the first electrode layer, and a part of the first heating layer overlaps with the second electrode layer, so that the first heating layer is electrically connected with the first electrode layer and the second electrode layer.

3. The heating assembly of claim 1, wherein, The continuous winding angle of the part of the first heating layer between the first electrode layer and the second electrode layer is greater than or equal to 360°.

4. The heating assembly of claim 2 or 3, wherein, The planar heating layer further comprises a second heating layer, and the first heating layer and the second heating layer are arranged in parallel between the first electrode layer and the second electrode layer. The first heating layer and the second heating layer are spaced apart in the longitudinal direction and / or the circumferential direction by less than or equal to 1 mm.

5. The heating assembly of claim 4, wherein, The heating portion comprises a substrate, the first heating layer is arranged on the substrate, and the continuous winding angle of the substrate is α, and α≥360°.

6. The heating assembly of claim 5, wherein, The thickness D of the substrate satisfies 0.05 mm≤D≤0.35 mm or 0.1 mm≤D≤0.2 mm; and / or 7. The heating assembly of claim 4, wherein, The substrate comprises a ceramic tape, or the substrate comprises alumina, zirconia, ZTA, aluminum nitride, silicon nitride, or silicon carbide.

8. The heating assembly of claim 7, wherein, The planar heating layer comprises a first heating layer, and an outer surface of the tubular structure comprises a part of the first heating layer. The heating portion further comprises a first electrode layer, the first electrode layer and the first heating layer are arranged on the same surface of the substrate, and the first electrode layer is electrically connected with the first heating layer.

9. The heating assembly of claim 7, wherein, The outer surface of the tubular structure comprises at least a part of the first electrode layer.

10. The heating assembly of claim 9, wherein, The heating portion further comprises a second electrode layer and a second conductive filler, the second electrode layer and the first heating layer are arranged on the same surface of the substrate, and the second electrode layer is electrically connected with the first heating layer; wherein A plurality of second through holes are formed in the substrate, and the plurality of second through holes are configured to form channels corresponding to each other after the heating portion is wound into a tubular structure, the second conductive filler is filled in the channels, one end of the second conductive filler is exposed on the outer surface of the tubular structure, and the other end of the second conductive filler is electrically connected with the second electrode layer; or 11. The heating assembly of claim 10, wherein, The tubular structure is a hollow structure, at least one second through hole corresponding to the second electrode layer is formed in the substrate, the second conductive filler is filled in the second through hole, one end of the second conductive filler is exposed on the inner surface of the tubular structure, and the other end of the second conductive filler is electrically connected with the second electrode layer. The planar heating layer comprises a first heating layer, and the first heating layer is hidden inside the tubular structure. ​ 12. The heating assembly of claim 7, wherein, ​ 13. The heating assembly of claim 12, wherein, The heating portion further comprises a first electrode layer and a second electrode layer, the first electrode layer, the second electrode layer and the first heating layer are arranged on the same surface of the substrate, and the first electrode layer and the second electrode layer are both electrically connected with the first heating layer; The first through hole and a plurality of second through holes are formed on the substrate, and the plurality of second through holes are configured to form a channel corresponding to each other after the heating portion is wound into a tubular structure; The first through hole is filled with a first conductive filler, one end of the first conductive filler is exposed on the outer surface of the tubular structure, and the other end is electrically connected with the first electrode layer; The channel is filled with a second conductive filler, one end of the second conductive filler is exposed on the outer surface of the tubular structure, and the other end is electrically connected with the second electrode layer.

14. The heating assembly of claim 7, wherein, The planar heating layer is arranged on the surface or surface layer of the substrate by printing, spraying, physical deposition, chemical deposition, ion sputtering or particle injection.

15. The heating assembly of claim 7, wherein, The substrate comprises a first section and a second section, the planar heating layer is arranged on the first section, and the first section is configured to be located inside the aerosol generating article when the heating assembly is combined with the aerosol generating article. The heating assembly further comprises a fixing seat, the second section is embedded in the fixing seat, and the distal end of the planar heating layer is adjacent to the fixing seat.

16. The heating assembly of claim 1, wherein, The planar heating layer is rectangular, and one of the length in the longitudinal direction and the length in the circumferential direction of the planar heating layer is greater than or equal to 2 mm, and the other is greater than or equal to 5 mm.

17. The heating assembly of claim 1, wherein, The heating assembly further comprises a guide portion, the guide portion comprises a substantially conical end cap and a rod portion connected with the distal end of the end cap, the proximal end of the heating portion abuts against the end cap, and the tubular structure is arranged around the rod portion; The length of the rod portion in the longitudinal direction is less than or equal to the length of the tubular structure in the longitudinal direction.

18. The heating assembly of claim 1, wherein, The heating assembly further comprises an emission enhancement layer arranged on the outer surface of the heating portion.

19. A heating assembly, characterized by Comprising: A heating portion, an outer surface of which is provided with a flow guide channel; The heating portion is used to release heat inside the aerosol generating article to generate aerosol, and the flow guide channel is used to guide the air outside to flow along the outer surface of the heating portion into the inside of the aerosol generating article to reduce the resistance of the aerosol generating article.

20. The heating assembly of claim 19, wherein, One side of the heating portion is a lap joint, the heating portion is configured to be continuously wound into a tubular structure of more than 360 degrees, and the lap joint is located outside the tubular structure and forms a step between the outer surface of the tubular structure, the step defines at least part of the boundary of the flow guide channel.

21. The heating assembly of claim 20, wherein, The heating portion comprises a substrate and a planar heating layer retained on the substrate, the substrate is continuously wound at an angle α satisfying: α≥360°, and the planar heating layer comprises a first heating layer, the length of the first heating layer in the circumferential direction is such that the first heating layer is continuously wound in the tubular structure at an angle β satisfying: 360°*0.8≤β≤360°*3, or 360°≤β≤360°*2.

22. An aerosol-generating device comprising: Comprising: A power supply assembly for energizing a heating assembly for releasing heat, the heating assembly being according to any one of claims 1-20.

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