Aerosol generating device and heater for aerosol generating device

Abstract

The utility model provides an aerosol generating device and a heater for the aerosol generating device. The aerial fog generating device comprises a chamber, a gas generator and a gas generator, a heating body surrounding or defining at least a portion of the chamber and for heating the aerosol-generating article; the heating body comprises a first end close to the opening and a second end deviating from the first end; the first electrode and the second electrode are longitudinally arranged on the heating body at intervals; the first electrode and the second electrode extend in the circumferential direction of the heating body, at least part of the first electrode is opposite to at least part of the second electrode in the longitudinal direction of the heating body, and then current is guided by the first electrode and the second electrode in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode; the distance between the second electrode and the first end is smaller than that between the second electrode and the second end. According to the aerial fog generating device, the current is longitudinally guided only on the part, close to the first end, of the heating body, and a gradient temperature field is favorably formed in the longitudinal direction.

Description

Technical Field

[0001] The present application relates to the technical field of heat-not-burn aerosol generation, and in particular to an aerosol generating device and a heater for the aerosol generating device. Background Art

[0002] Smoking articles (eg, cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. Attempts have been made to replace these tobacco-burning articles by creating products that release compounds without combustion.

[0003] An example of such a product is a heating device that releases compounds by heating rather than burning a material. For example, the material may be an aerosol-generating article containing tobacco or other non-tobacco products, which may or may not contain nicotine. A known heating device houses and heats the aerosol-generating article in a tubular heating body made of a conductive ceramic material. Ring-shaped electrodes are arranged at opposite longitudinal ends of the tubular conductive ceramic heating body, thereby directing current along the entire longitudinal direction of the tubular heating body to generate Joule heat. Utility Model Content

[0004] One embodiment of the present application provides an aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; comprising:

[0005] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0006] a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first end proximate to the opening and a second end facing away from the first end;

[0007] A first electrode and a second electrode are arranged on the heating body at intervals along the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend circumferentially along the heating body, at least a portion of the first electrode is opposite to at least a portion of the second electrode in the longitudinal direction of the heating body, and thus, in use, the first electrode and the second electrode guide current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the distance between the second electrode and the first end is less than the distance between the second electrode and the second end.

[0008] In some embodiments, the heating body is prepared by molding and then sintering a conductive ceramic material;

[0009] Alternatively, the heating body is a conductive ceramic body.

[0010] In some embodiments, the material of the heating body has a temperature coefficient of resistance of -1500 to -2500 ppm / °C.

[0011] In some embodiments, the heating body has a thermal conductivity of greater than 20 W / m.k.

[0012] In some embodiments, the first electrode and / or the second electrode is a closed ring.

[0013] In some embodiments, the first electrode and / or the second electrode is configured to be non-closed in the circumferential direction;

[0014] The first electrode has a first gap, and / or the second electrode has a second gap.

[0015] In some embodiments, the first gap and the second gap are arranged offset in the longitudinal direction of the heating body.

[0016] In some embodiments, the first gap and / or the second gap extends in an arc of 0.1π to 0.8π in the circumferential direction of the heating body.

[0017] In some embodiments, the first electrode and / or the second electrode extends in an arc of 0.03π to 2π in the circumferential direction of the heating body.

[0018] In some embodiments, the first electrode and the second electrode extend in the same arc in the circumferential direction of the heating body.

[0019] Alternatively, the first electrode and the second electrode extend in different arcs in the circumferential direction of the heating body.

[0020] In some embodiments, the first electrode has at least one first section, and the second electrode has at least one second section; at least one of the first sections and at least one of the second sections are opposite in the longitudinal direction of the heating body.

[0021] In some embodiments, the first section and / or the second section extends in an arc of 0.03π to 1.75π in the circumferential direction of the heating body.

[0022] In some embodiments, the first electrode has two spaced apart first sections, and the second electrode has two spaced apart second sections.

[0023] In some embodiments, further comprising:

[0024] An electrically conductive transition bonding layer formed or arranged between the first electrode and / or the second electrode and the heating body for providing a bond between the first electrode and / or the second electrode and the heating body.

[0025] In some embodiments, the transition bond layer has a thickness of 0.01mm to 1.0mm.

[0026] In some embodiments, the transition bond layer has a coefficient of thermal expansion less than that of the first electrode and / or the second electrode.

[0027] In some embodiments, the first electrode has a first spacing from the first end, a second spacing from the second electrode, and a third spacing from the second end; the second spacing is greater than the first spacing, and the second spacing is less than the third spacing.

[0028] In some embodiments, the heater comprises:

[0029] a first portion proximate or defining the first end, and a second portion proximate or defining the second end; the first electrode and / or the second electrode is arranged on the first portion and away from the second portion;

[0030] when current is directed through the first electrode and the second electrode across the heater, the first portion is capable of heating by resistive Joule heating, and the second portion is capable of heating by receiving heat transferred from the first portion.

[0031] In some embodiments, the heater is free of an electrode for directing current across the second portion.

[0032] Yet another embodiment of the present application also provides an aerosol generating device configured to heat an aerosol generating article to generate an aerosol; comprising:

[0033] a chamber having an open end; in use, the aerosol generating article is at least partially receivable within or removable from the chamber through the open end;

[0034] a heater surrounding or defining at least a portion of the chamber and configured to heat the aerosol generating article; the heater has a first electrode and a second electrode arranged longitudinally spaced apart thereon; the first electrode and the second electrode are arranged to extend circumferentially along the heater, at least a portion of the first electrode being opposite to at least a portion of the second electrode in the longitudinal direction of the heater, whereby in use, current is directed through the first electrode and the second electrode in the longitudinal direction of the heater;

[0035] the first electrode and / or the second electrode is configured to be non-closed in the circumferential direction.

[0036] Yet another embodiment of the present application provides an aerosol generating device configured to heat an aerosol generating article to generate an aerosol; comprising:

[0037] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0038] a heating body made of a conductive ceramic material, surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first portion and a second portion sequentially arranged in a longitudinal direction;

[0039] A first electrode and a second electrode are arranged on the first part at intervals in the longitudinal direction and avoid the second part; the first electrode and the second electrode are arranged to extend along the circumference of the heating body, and then in use, the first electrode and the second electrode guide current on the first part, so that the first part heats the aerosol generating article through resistive Joule heat; the second part generates heat by receiving the heat transferred by the first part, thereby heating the aerosol generating article.

[0040] Yet another embodiment of the present application provides an aerosol generating device configured to heat an aerosol generating article to generate an aerosol; comprising:

[0041] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0042] a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article;

[0043] A first electrode and a second electrode are arranged on the heating body at intervals to guide current on the heating body;

[0044] A conductive transition bonding layer is formed or arranged between the first electrode and / or the second electrode and the heating body to provide bonding between the first electrode and / or the second electrode and the heating body.

[0045] Yet another embodiment of the present application further provides a heater for an aerosol generating device, comprising:

[0046] a first end and a second end facing each other in a longitudinal direction;

[0047] a tubular heating body extending from the first end to the second end;

[0048] a first electrode and a second electrode are arranged on the heating body at intervals in the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend in the circumferential direction of the heating body, at least part of the first electrode being opposite at least part of the second electrode in the longitudinal direction of the heating body, whereby in use the first electrode and the second electrode direct an electric current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the second electrode is located at a distance from the first end which is smaller than the distance from the second end.

[0049] Yet another embodiment of the present application also proposes a heater for an aerosol-generating device, comprising:

[0050] a tubular heating body;

[0051] a first electrode and a second electrode are arranged on the heating body at intervals in the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend in the circumferential direction of the heating body, at least part of the first electrode being opposite at least part of the second electrode in the longitudinal direction of the heating body, whereby in use the first electrode and the second electrode direct an electric current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the second electrode is located at a distance from the first end which is smaller than the distance from the second end.

[0052] the first electrode and / or the second electrode are configured to be non-closed in the circumferential direction.

[0053] Yet another embodiment of the present application also proposes a heater for an aerosol-generating device, comprising:

[0054] a tubular heating body made of an electrically conductive ceramic material; the heating body comprises a first portion and a second portion arranged in sequence in the longitudinal direction;

[0055] a first electrode and a second electrode are arranged on the heating body at intervals in the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend in the circumferential direction of the heating body, at least part of the first electrode being opposite at least part of the second electrode in the longitudinal direction of the heating body, whereby in use the first electrode and the second electrode direct an electric current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the second electrode is located at a distance from the first end which is smaller than the distance from the second end.

[0056] Yet another embodiment of the present application also proposes a heater for an aerosol-generating device, comprising:

[0057] a tubular heating body;

[0058] a first electrode and a second electrode are arranged on the heating body at intervals in the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend in the circumferential direction of the heating body, at least part of the first electrode being opposite at least part of the second electrode in the longitudinal direction of the heating body, whereby in use the first electrode and the second electrode direct an electric current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the second electrode is located at a distance from the first end which is smaller than the distance from the second end.

[0059] A conductive transition bonding layer is formed or arranged between the first electrode and / or the second electrode and the heating body to provide bonding between the first electrode and / or the second electrode and the heating body.

[0060] The above aerosol generating device guides the current longitudinally only on the portion of the heating body close to the first end, which is beneficial for forming a gradient temperature field in the longitudinal direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0062] Figure 1 is a schematic diagram of an aerosol generating device provided by an embodiment;

[0063] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle heater from one perspective;

[0064] Figure 3 yes Figure 2 Schematic diagram of the circumferential expansion perspective of the middle heater;

[0065] Figure 4 is a structural schematic diagram of a heater according to another embodiment from one perspective;

[0066] Figure 5 yes Figure 4 An exploded diagram of one view of the central heater;

[0067] Figure 6 yes Figure 4 Schematic diagram of the circumferential expansion perspective of the middle heater;

[0068] Figure 7 is a schematic diagram of a heater according to yet another embodiment from a circumferentially expanded perspective;

[0069] Figure 8 It is a structural schematic diagram of a heater according to another embodiment from one perspective. DETAILED DESCRIPTION

[0070] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific implementation methods.

[0071] One embodiment of the present application provides an aerosol generating device 100 that heats, rather than burns, an aerosol generating article 1000, such as a cigarette, to volatilize or release at least one component of the aerosol generating article 1000 to form an aerosol for inhalation, for example Figure 1 shown.

[0072] In an alternative embodiment, the aerosol-generating article 1000 preferably comprises a tobacco-containing material that releases volatile compounds from the substrate upon heating; or it may comprise a non-tobacco material that is suitable for electrically heated smoking after heating. The aerosol-generating article 1000 preferably comprises a solid substrate that may comprise one or more of powder, granules, shredded strips, ribbons, or flakes of one or more of herb leaves, tobacco leaves, homogenized tobacco, expanded tobacco, dried flowers, tea leaves, etc. Alternatively, the solid substrate may contain additional tobacco or non-tobacco volatile flavor compounds that are released upon heating.

[0073] according to Figure 1 As shown, when the aerosol-generating article 1000 is received in the aerosol-generating device 100 , a portion thereof is exposed outside the aerosol-generating device 100 , such as a filter tip, for the user to inhale.

[0074] The structure of the aerosol generating device 100 according to one embodiment of the present application can be found in Figure 1 As shown, the overall shape of the device is generally configured as a longitudinal shape, and the aerosol generating device 100 includes:

[0075] a chamber having an opening 40; in use, an aerosol-generating article 1000 can be removably received in the chamber through the opening 40 of the chamber;

[0076] a heater 30 disposed at least partially surrounding or defining the chamber; when the aerosol-generating article 1000 is received in the chamber, the heater 30 surrounds the aerosol-generating article 1000 from the outside and heats the aerosol-generating article 1000, thereby causing the aerosol-generating article 1000 to release a plurality of volatile compounds, wherein the volatile compounds are formed solely by the heating process;

[0077] A battery cell 10 for supplying power; more preferably, the battery cell 10 is a rechargeable DC battery cell 10 and can be charged by connecting to an external power source;

[0078] The circuit board 20 , such as a PCB board or an FPC board, is provided with a circuit for conducting current between the battery cell 10 and the heater 30 .

[0079] exist Figure 1 and Figure 2In the illustrated embodiment, the heater 30 is arranged to have a tubular shape, and a chamber for receiving the aerosol-generating article 1000 is formed or defined by at least a portion of the tubular hollowness of the heater 30. When the aerosol-generating article 1000 is received in the chamber, the heater 30 at least partially surrounds or encloses the aerosol-generating article 1000 and heats the aerosol-generating article 1000 from the periphery. Furthermore, when the aerosol-generating article 1000 is received in the chamber, it is at least partially contained and retained within the heater 30.

[0080] In some embodiments, the heater 30 may have an inner diameter dimension d11 of approximately 5.8 mm to 10 mm. In some embodiments, the heater 30 may have a length d12 of approximately 10 mm to 15 mm. In an embodiment, the circumferential length or perimeter of the heater 30 is greater than the length d12 of the heater 30 along the longitudinal direction. In some embodiments, the longitudinal length d12 of the heater 30 does not exceed 15 mm or is less than 15 mm; preferably, the longitudinal length d12 of the heater 30 is between 9 and 15 mm. In some specific embodiments, the heater 30 may have an inner diameter d11 of 7.6 mm; the heater 30 may have a length d12 of 11 mm.

[0081] exist Figure 2 and Figure 3 In the embodiment shown, the heater 30 comprises:

[0082] a tubular heating body 31 made of a conductive ceramic material; and

[0083] A first electrode 321 and a second electrode 322 are formed on the outer surface of the heating body 31 .

[0084] In some embodiments, the heating body 31 is dense. In some specific embodiments, the porosity of the heating body 31 is less than 5%; more preferably, the porosity of the heating body 31 is less than 3%.

[0085] In some embodiments, the thickness of the tube wall of the heating body 31 is between 0.3 mm and 2.0 mm. In some specific embodiments, the thickness of the tube wall of the heating body 31 is 0.6 mm.

[0086] In some embodiments, the tubular heater 31 made of a conductive ceramic material is prepared by injection molding the conductive ceramic material raw material within a mold, followed by sintering and solidifying. For example, the preparation process may include: mixing the conductive ceramic material raw material with a liquid solvent to form an injectable slurry; injecting the slurry into a mold cavity to form a tubular green body; and removing the green body from the mold, followed by sintering and solidifying to obtain the heater 31.

[0087] In some embodiments, the heater 31 is independently molded from a conductive ceramic material. In an embodiment, the tubular heater 31 made of a conductive ceramic material only includes or has a single heater, rather than a composite heater formed by combining multiple functional elements of different materials. For example, the composite heater includes a supporting electrically insulating substrate (such as an electrically insulating ceramic or surface insulating metal, etc.), a resistive heating track or coating or etching mesh printed, deposited, wrapped, or mounted on the surface of the electrically insulating substrate, etc. In some embodiments, the heater 31 is or only includes a conductive ceramic body.

[0088] In some embodiments, the thermal conductivity of the heater 31 is designed to be higher than that of conventional glass or ceramics. Glass typically has a thermal conductivity of approximately 1 W / mk, while ceramics typically have a thermal conductivity of less than 20 W / mk or even less than 10 W / mk. In some embodiments, the thermal conductivity of the heater 31 is greater than 20 W / mk; more preferably, the thermal conductivity of the heater 31 is between 20 and 50 W / mk.

[0089] In an embodiment, the thermal conductivity of the heater 31 is greater than 25 W / mK. In some specific embodiments, the thermal conductivity of the heater 31 made of a conductive ceramic material is between 25 and 40 W / mK. Alternatively, in still other specific embodiments, the thermal conductivity of the heater 31 is approximately 30 W / mK. In an embodiment, by ensuring that the thermal conductivity of the heater 31 falls within the above range, it is advantageous to generate Joule heating and a temperature field difference during heating in a partial area by arranging the first electrode 321 and the second electrode 322.

[0090] In some embodiments, the relatively improved thermal conductivity of the heater 31 is achieved by adding a metal oxide component that is a ceramic phase and has a relatively high thermal conductivity, such as aluminum oxide or titanium oxide, to the heater 31, thereby achieving the above-mentioned thermal conductivity. In some embodiments, the relatively improved thermal conductivity of the heater 31 is achieved by adding a conductive metal that improves thermal conductivity, such as gold, silver, or copper, to the conductive ceramic material, thereby achieving the above-mentioned thermal conductivity.

[0091] In some embodiments, the resistivity of the heating element 31 made of conductive ceramic material is between 1×10 -4 Ω·cm~1.3×10 -1 Ω·cm. Figure 2 and Figure 3In some preferred embodiments, when current is conducted through the first electrode 321 and the second electrode 322 in the heater 31, the resistance of the heater 31 measured through the first electrode 321 and the second electrode 322 is between 0.5 and 5 Ω. In some preferred embodiments, the resistance of the heater 31 measured through the first electrode 321 and the second electrode 322 is between 0.8 and 1.5 Ω. In one specific embodiment, the resistance of the heater 31 measured through the first electrode 321 and the second electrode 322 is approximately 1.4 Ω.

[0092] In some embodiments, the battery cell 10 has an output voltage of approximately 3.7 to 4.5 V. In use, when the circuit board 20 supplies power to the heater 31 through the first electrode 321 and the second electrode 322 , the operating power of the heater 31 is approximately 10 to 40 W.

[0093] In some embodiments, the conductive ceramic material of the heating element 31 includes a main component and a dopant component. In some embodiments, the main component accounts for greater than 80% and less than or equal to 98% of the conductive ceramic by mass; the dopant component accounts for greater than 1% and less than or equal to 20% of the conductive ceramic by mass.

[0094] In some embodiments, the host component comprises a first metal oxide and the dopant component comprises a second metal oxide; the valence of the metal in the first metal oxide is different from the valence of the metal in the second metal oxide. In some embodiments, the valence of the metal in the first metal oxide is less than the valence of the metal in the second metal oxide; or in some embodiments, the valence of the metal in the first metal oxide is greater than the valence of the metal in the second metal oxide. In some embodiments, the valence of the metal in the second metal oxide is greater than 3.

[0095] In some embodiments, the main component includes zinc oxide, and the dopant component includes at least one of aluminum oxide, zirconium dioxide, titanium dioxide, or niobium pentoxide. In some embodiments, the zinc oxide accounts for 94% to 97% by weight of the conductive ceramic. In some embodiments, the dopant component includes aluminum oxide, and the aluminum oxide accounts for 0.5% to 5% by weight of the conductive ceramic.

[0096] In some embodiments, the main component includes titanium dioxide and the doping component includes at least niobium pentoxide. In some embodiments, the titanium dioxide accounts for 85% to 95% by weight of the conductive ceramic, and the niobium pentoxide accounts for 5% to 20% by weight of the conductive ceramic.

[0097] In some embodiments, the host component includes tantalum pentoxide; and the dopant component includes at least one of titanium dioxide or zirconium dioxide.

[0098] In some embodiments, the host component includes at least one of an electrically conductive metal boride or metal nitride or metal carbide; and the dopant component includes at least one of a non-conductive metal oxide or metal nitride.

[0099] In some embodiments, the host component includes at least one of titanium boride, titanium nitride or titanium carbide. In some embodiments, the dopant component includes at least one of silicon dioxide, zirconium dioxide.

[0100] In some embodiments, the host component is between 20% and 80% by mass of the electrically conductive ceramic. In some embodiments, the dopant component is between 30% and 80% by mass of the electrically conductive ceramic.

[0101] In some embodiments, the electrically conductive ceramic material of the heating element 31 further includes an electrically conductive resistivity / thermal conductivity adjusting component for controlling the resistivity or thermal conductivity of the electrically conductive ceramic within a target range. In some embodiments, the electrically conductive resistivity / thermal conductivity adjusting component includes at least one of an electrically conductive metal carbide, metal boride, carbon powder or electrically conductive metal powder. In some embodiments, the metal carbide includes silicon carbide; and / or the metal boride includes titanium boride. In some embodiments, the electrically conductive metal powder includes at least one of gold powder, silver powder or copper powder.

[0102] In some embodiments, the electrically conductive resistivity / thermal conductivity adjusting component is between 10% and 50% by mass of the electrically conductive ceramic.

[0103] In some alternative embodiments, the electrically conductive ceramic material of the heating element 31 includes zinc oxide at 94-97% by mass, aluminum trioxide at 0.8-5%, titanium dioxide at 0-1% and zirconium dioxide at 0-0.5.

[0104] In some alternative embodiments, the electrically conductive ceramic material of the heating element 31 includes titanium dioxide at 85-95% by mass and niobium pentoxide at 5-20%.

[0105] In some alternative embodiments, the electrically conductive ceramic material of the heating element 31 includes titanium boride at 5-10% by mass, zinc oxide at 80-90% and aluminum trioxide at 1-5%.

[0106] In some alternative embodiments, the electrically conductive ceramic material of the heating element 31 includes titanium boride at 50-80% by mass, silicon carbide at 20-50% and silicon dioxide at 0.1-2%.

[0107] In some alternative embodiments, the electrically conductive ceramic material of the heating element 31 includes titanium boride at 40-70% by mass, zirconium dioxide at 30-60% and silicon dioxide at 0.1-5%.

[0108] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 20-50% by mass of titanium boride, 30-50% by mass of zirconium dioxide, and 10-30% by mass of copper powder, silver powder, or gold powder.

[0109] In some embodiments, the heater 31 made of conductive ceramic material has a negative temperature coefficient of resistance. In operation, when the temperature of the heater 31 rises, the resistance of the heater 31 decreases. For example, in some embodiments, the temperature coefficient of resistance of the heater 31 made of conductive ceramic material is between -1500 and -2500 ppm / °C. For example, Figure 2 and Figure 3 In the embodiment shown, when current is conducted on the heater 31 through the first electrode 321 and the second electrode 322 at room temperature, the initial resistance value of the heater 31 is 1.4Ω; when the temperature of the heater 31 rises to approximately 350°C, the resistance value of the heater 31 drops to approximately 0.5Ω.

[0110] according to Figure 2 and Figure 3 As shown, the heating body 31 includes:

[0111] The first end 310 and the second end 320 are opposite to each other in the longitudinal direction. The first end 310 is arranged toward the opening 40; in use, the aerosol-generating article 1000 can be received into or removed from the heating body 31 from the first end 310.

[0112] according to Figure 2 and Figure 3 As shown, the heating body 31 further includes a first portion 311 and a second portion 312 arranged in the longitudinal direction; wherein the first portion 311 is close to or defines the first end 310, and the second portion 312 is close to and defines the second end 320. In an embodiment, the first portion 311 and the second portion 312 are continuous; there is no separation or boundary between the first portion 311 and the second portion 312.

[0113] Alternatively, in some other embodiments, there is a transition bonding layer between the first electrode 321 and / or the second electrode 322 and the heating body 31; in the embodiment, the transition bonding layer forms a tight bond between the first electrode 321 and / or the second electrode 322 made of metal and the heating body 31 made of ceramic.

[0114] In some embodiments, the thickness of the transition bonding layer is approximately 0.01 mm to 1.0 mm, or in a more preferred embodiment, the thickness of the transition bonding layer is approximately 0.05 mm to 0.8 mm.

[0115] In some embodiments, the thermal expansion coefficient of the transition bonding layer is smaller than the thermal expansion coefficient of the first electrode 321 and / or the second electrode 322 , which is beneficial for suppressing deformation of the first electrode 321 and / or the second electrode 322 during use.

[0116] In some embodiments, the transition bonding layer is electrically conductive.

[0117] For example, in some embodiments, the material of the transition bonding layer may be a metal or an alloy, such as silver, aluminum, titanium, or alloys thereof.

[0118] For example, in some embodiments, the material of the transition bonding layer can be a composite material of ceramic and metal. This allows the transition bonding layer to simultaneously have material compatibility with the first electrode 321 and / or the second electrode 322 made of metal, and with the heating body 31 made of ceramic. For example, in some optional embodiments, the material of the transition bonding layer can include 10-80% metal and 20-90% ceramic. The metal of the transition bonding layer can include at least one of gold, silver, copper, aluminum, nickel, titanium, zirconium, platinum, etc. The ceramic of the transition bonding layer can include oxides or nitrides such as aluminum oxide, zirconium oxide, titanium oxide, iron oxide, and silicon oxide.

[0119] In some embodiments, the transition bonding layer is obtained by printing or coating a slurry of the above materials on the outer surface of the heating body 31 and then sintering.

[0120] according to Figure 2 and Figure 3 As shown, the first electrode 321 and the second electrode 322 are bonded to the outer surface of the heating body 31 and are arranged at intervals along the longitudinal direction of the heating body 31 .

[0121] according to Figure 2 and Figure 3 As shown, the first electrode 321 and / or the second electrode 322 are arranged along the circumference of the heating body 31. The first electrode 321 and / or the second electrode 322 are annular around the heating body 31. Figure 2 and Figure 3 As shown, the first electrode 321 and / or the second electrode 322 are closed in the circumferential direction; or, the first electrode 321 and / or the second electrode 322 are closed rings.

[0122] In some embodiments, the first electrode 321 and / or the second electrode 322 include at least one of an electrode ring, an electrode cap, an electrode sheet, a track electrode, or an electrode coating. In some embodiments, the first electrode 321 and / or the second electrode 322 are made of a metal or alloy with low resistivity. For example, the first electrode 321 and / or the second electrode 322 include gold, silver, copper, or an alloy containing at least one of them. In some embodiments, the first electrode 321 and / or the second electrode 322 are obtained by printing, spraying, or depositing a conductive paste containing the above low resistivity metal or alloy on the outer surface of the heating body 31 and then curing it. For example, the first electrode 321 and / or the second electrode 322 are obtained by printing a conductive silver paste on the outer surface of the heating body 31 and then curing it.

[0123] according to Figure 2 and Figure 3 As shown, the first electrode 321 and / or the second electrode 322 are located on the first portion 311 of the heating body 31 and avoid the second portion 312. The second portion 312 does not have an electrode for conducting current thereon.

[0124] according to Figure 2 and Figure 3 As shown, the first electrode 321 is closer to the first end 310 than the second electrode 322. Figure 2 and Figure 3 As shown, the distance between the first electrode 321 and / or the second electrode 322 and the first end 310 is smaller than the distance between the first electrode 321 and the second electrode 322 and the second end 320 .

[0125] exist Figure 2 and Figure 3 In the embodiment, a first distance d31 is defined between the first electrode 321 and the first end 310 , a second distance d32 is defined between the first electrode 321 and the second electrode 322 , and a third distance d33 is defined between the second electrode 322 and the second end 320 .

[0126] In some embodiments, the first distance d31 is smaller than the third distance d33 between the second electrode 322 and the second end 320. The first distance d31 is smaller than the second distance d32. The second distance d32 is smaller than the third distance d33.

[0127] In some embodiments, the first spacing d21 is between 0.5 and 2.0 mm. The second spacing d32 is between 1 and 4 mm. In some alternative embodiments, the first spacing d21 is approximately 1 mm. The second spacing d32 is approximately 2 mm. Alternatively, in some embodiments, the ratio of the second spacing d32 to the longitudinal length of the heater 31 is between 5% and 50%. In more preferred embodiments, the ratio of the second spacing d32 to the longitudinal length of the heater 31 is between 5% and 40%.

[0128] exist Figure 2 and Figure 3 In the embodiment, the ratio of the third distance d33 between the second electrode 322 and the second end 320 to the longitudinal length of the heating body 31 is between 0% and 85%. Alternatively, in a more preferred embodiment, the ratio of the third distance d33 to the longitudinal length of the heating body 31 is between 40% and 80%.

[0129] In some embodiments, the dimension of the first electrode 321 and / or the second electrode 322 along the longitudinal direction of the heater 31 is between 1 and 4 mm. In some optional embodiments, the dimension of the first electrode 321 and / or the second electrode 322 along the longitudinal direction of the heater 31 is approximately 2 mm. In some optional embodiments, the ratio of the dimension of the first electrode 321 and / or the second electrode 322 along the longitudinal direction of the heater 31 to the longitudinal length of the heater 31 is between 1% and 40%; more preferably, the ratio of the dimension of the first electrode 321 and / or the second electrode 322 along the longitudinal direction of the heater 31 to the longitudinal length of the heater 31 is between 5% and 40%; even more preferably, the ratio of the dimension of the first electrode 321 and / or the second electrode 322 along the longitudinal direction of the heater 31 to the longitudinal length of the heater 31 is between 10% and 30%.

[0130] In an embodiment, the first electrode 321 and the second electrode 322 are electrically connected to the circuit board 20 by welding conductive leads, etc.; thus, in use, the circuit board 20 can operably connect the first electrode 321 and the second electrode 322 to the positive / negative poles of the battery cell 10, thereby guiding current on the heating body 31.

[0131] according to Figure 3 As shown, when power is supplied to the heater 31 via the first electrode 321 and the second electrode 322, a current i1 is generated on the heater 31, flowing from the first electrode 321 to the second electrode 322. The current i1 is substantially along the longitudinal direction of the heater 31. During operation, the current i1 is substantially in the longitudinal direction of the heater 31. In an embodiment, the current i1 is primarily located in or generated in the first portion 311 of the heater 31, while substantially no current flows in the second portion 312.

[0132] In the embodiment, the heater 30 only includes the first electrode 321 and the second electrode 322. In use, when power is supplied to the heating body 31 via the first electrode 321 and the second electrode 322, the first portion 311 of the heating body 31 generates heat by resistive Joule heating. The second portion 312 does not generate heat by itself, but rather generates heat as shown in FIG. Figure 3 The middle arrow R1 indicates that the heating element 31 generates heat by receiving heat transferred from the first portion 311. The heating element 31 does not have an electrode for guiding current on the second portion 312.

[0133] In some embodiments, the circuitry on the circuit board 20 is configured to control the power supplied to the heater 31 according to a predetermined heating curve, thereby causing the heater 31 to heat the aerosol-generating article 1000 according to the predetermined heating curve. For example, the applicant provides various details regarding the predetermined heating curve in Chinese patent CN112335940A, etc., which are incorporated herein by reference in their entirety.

[0134] In use, during the heating process of the heating body 31 being powered by the first electrode 321 and the second electrode 322, the temperature changes of the first portion 311 and the second portion 312 include:

[0135] During the first time period or preheating period, the first portion 311 is heated from room temperature to a predetermined temperature. During the first time period, the temperature of the first portion 311 is greater than the temperature of the second portion 312 because the second portion 312 can only generate heat by receiving heat transferred from the first portion 311.

[0136] In the second time stage or heating stage, the first part 311 is kept heated within a predetermined temperature range; in this second time stage, since the heating body 31 has the above-mentioned improved thermal conductivity, the second part 312 receives the conducted heat more quickly and thus has a temperature that is basically the same or similar to that of the first part 311.

[0137] or Figures 4 to 6 FIG. 4 is a schematic diagram of a heater 30a according to another embodiment; in this embodiment, the heater 30a comprises:

[0138] a tubular heating body 31 a extending between a first end 310 a and a second end 320 a ;

[0139] The first electrode 321 a and the second electrode 322 a are formed or bonded on the outer surface of the heating body 31 a and are arranged at intervals along the longitudinal direction of the heating body 31 a .

[0140] exist Figures 4 to 6As shown, the heating body 31a includes a first portion 311a and a second portion 312a arranged continuously in the longitudinal direction. The first electrode 321a and the second electrode 322a are combined on the first portion 311a. Figure 6 As shown, in use, the first electrode 321a and the second electrode 322a are electrically connected to the circuit board 20 by welding conductive leads, so that the circuit board 20 guides the current i1a to the first portion 311a of the heating body 31a through the first electrode 321a and the second electrode 322a. The current i1a is basically along the longitudinal direction of the heating body 31a. During operation, the first portion 311a can generate heat through resistive Joule heating; the second portion 312a mainly generates heat by receiving heat transferred from the first portion 311a. The heat transfer is as follows: Figure 6 As shown by the arrow R1.

[0141] In an embodiment, the first electrode 321a and / or the second electrode 322a are arranged to extend along the circumference of the heating body 31a. In an embodiment, the first electrode 321a and / or the second electrode 322a are not closed in the circumferential direction of the heating body 31a. Alternatively, at least one of the first electrode 321a and the second electrode 322a is not closed in the circumferential direction.

[0142] exist Figures 4 to 6 As shown, the first electrode 321a and / or the second electrode 322a is in an arc shape extending along the circumference of the heating body 31a. At least a portion of the first electrode 321a and at least a portion of the second electrode 322a are opposite in the longitudinal direction of the heating body 31a; or, in the longitudinal direction of the heating body 31a, the first electrode 321a and the second electrode 322a cannot be completely staggered. In some optional embodiments, the first electrode 321a and the second electrode 322a are the same in arc extending along the circumference of the heating body 31a; or in some other optional embodiments, the first electrode 321a and the second electrode 322a are different in arc extending along the circumference of the heating body 31a. For example, the arc of the first electrode 321a extending along the circumference of the heating body 31a is smaller than the arc of the second electrode 322a extending along the circumference of the heating body 31a. Figures 4 to 6 As shown, the arc of the first electrode 321 a and / or the second electrode 322 a extending along the circumference of the heating body 31 a is between π and 2π.

[0143] exist Figures 4 to 6As shown, the first electrode 321a defines a first notch 3211a; the second electrode 322a defines a second notch 3221a. In one embodiment, the first notch 3211a and the second notch 3221a are completely staggered in the longitudinal direction of the heater 31a. Alternatively, in other alternative embodiments, the first notch 3211a and the second notch 3221a are partially staggered in the longitudinal direction of the heater 31a. Alternatively, in other alternative embodiments, the first notch 3211a and the second notch 3221a are arranged in opposite directions in the radial direction of the heater 31a.

[0144] exist Figures 4 to 6 As shown, the extension arc d41 of the first notch 3211a in the circumferential direction of the heating body 31a and the extension arc d42 of the second notch 3221a in the circumferential direction of the heating body 31a are the same. Or in some embodiments, the extension arc d41 of the first notch 3211a in the circumferential direction of the heating body 31a and the extension arc d42 of the second notch 3221a in the circumferential direction of the heating body 31a are different; for example, in an optional embodiment, the extension arc d41 of the first notch 3211a is greater than the extension arc d42 of the second notch 3221a. In some embodiments, the extension arc d41 of the first notch 3211a and / or the extension arc d42 of the second notch 3221a are approximately between 0.1π and 0.8π. For example, in Figures 4 to 6 As shown, the extension arc d41 of the first notch 3211 a and / or the extension arc d42 of the second notch 3221 a is approximately 0.3π to 0.5π.

[0145] exist Figures 4 to 6 As shown, in the longitudinal direction of the heating body 31a, the first electrode 321a has at least one or more first sections that are longitudinally opposite to the second electrode 322a. Correspondingly, the second electrode 322a has at least one or more second sections that are longitudinally opposite to the first electrode 321a. Specifically, Figures 4 to 6 As shown, the first electrode 321a has two first segments longitudinally opposite to the second electrode 322a, namely the first segment 3212a and the first segment 3213a; the second electrode 322a has two second segments longitudinally opposite to the first electrode 321a, namely the second segment 3222a and the second segment 3223a. The first segment 3212a and the second segment 3222a are longitudinally opposite to each other, and the first segment 3213a and the second segment 3223a are longitudinally opposite to each other. Figure 6 As shown, the first segment is spaced apart, that is, the first segment 3212a and the first segment 3213a are spaced apart; the second segment is spaced apart, that is, the second segment 3222a and the second segment 3223a are spaced apart.

[0146] exist Figures 4 to 6As shown, each first segment and / or each second segment extends circumferentially over an arc ranging from 0.03π to π; alternatively, each first segment and / or each second segment extends circumferentially over an angle ranging from 5° to 180°. In preferred embodiments, each first segment and / or each second segment extends circumferentially over an arc ranging from π / 3 to 2π / 3. For example, in some specific embodiments, the circumferential extension angles of the first segment 3212a / first segment 3213a / second segment 3222a / second segment 3223a are 60°, 90°, or 180°.

[0147] exist Figures 4 to 6 As shown, when current is directed through the heater 31a via the first electrode 321a and the second electrode 322a, the current i1a on the heater 31a primarily flows in the first region between the first segment 3212a and the second segment 3222a, and in the second region between the first segment 3213a and the second segment 3223a. Consequently, during operation, resistive Joule heating is primarily generated in the first region between the first segment 3212a and the second segment 3222a, and in the second region between the first segment 3213a and the second segment 3223a. This is beneficial for forming a differential temperature field on the heater 31a.

[0148] In some embodiments, the length of the first segment 3213a is less than the length of the first segment 3212a; or the length of the second segment 3222a is less than the length of the second segment 3223a. Thus, the area of ​​the first region is greater than the area of ​​the second region. Alternatively, in still other embodiments, the length of the first segment 3213a is equal to the length of the first segment 3212a; or the length of the second segment 3222a is equal to the length of the second segment 3223a. Thus, the area of ​​the first region is equal to the area of ​​the second region.

[0149] or Figure 7 A schematic diagram of a heater 30b of yet another embodiment is shown; in this embodiment, the heater 30b includes:

[0150] a tubular heating body 31 b extending between a first end 310 b and a second end 320 b;

[0151] The first electrode 321 b and the second electrode 322 b are formed or bonded on the heating body 31 b and are arranged at intervals along the longitudinal direction of the heating body 31 b.

[0152] exist Figure 7In the illustrated embodiment, the first electrode 321b and the second electrode 322b are non-closed in the circumferential direction. The first electrode 321b has a first gap 3211b, and the second electrode 322b has a second gap 3221b. The first gap 3211b and the second gap 3221b are at least partially staggered in the longitudinal direction. The first electrode 321b and the second electrode 322b extend over an arc of 0.03π to 2π in the circumferential direction of the heating body 31b. More preferably, the first electrode 321b and the second electrode 322b extend over an arc of π to 1.75π in the circumferential direction of the heating body 31b.

[0153] In Figure 7 In the illustrated embodiment, the first electrode 321b has a first section 3212b longitudinally opposite the second electrode 322b in the longitudinal direction of the heating body 31b. Correspondingly, the second electrode 322b has a second section 3222b longitudinally opposite the first electrode 321b. The first section 3212b and / or the second section 3222b extend over an arc d51 of 0.03π to 1.75π in the circumferential direction. For example, in some specific embodiments, the first section 3212b and / or the second section 3222b extend over an angle of 60°, 90°, 180° or 270° in the circumferential direction.

[0154] In Figure 7 In the illustrated embodiment, the first section 3212b is continuous, rather than being spaced apart, and the second section 3222b is continuous, rather than being spaced apart.

[0155] In Figure 7 In the illustrated embodiment, the first electrode 321b extends over a length in the circumferential direction that is less than the length over which the second electrode 322b extends in the circumferential direction. Alternatively, in yet other embodiments, the first electrode 321b extends over a length in the circumferential direction that is equal to the length over which the second electrode 322b extends in the circumferential direction.

[0156] Alternatively Figure 8 A schematic view of a heater 30c is shown, which illustrates yet another embodiment. In this embodiment, the heater 30c comprises:

[0157] A tubular heating body 31c extending between a first end 310c and a second end 320c;

[0158] A first electrode 321c and a second electrode 322c formed on or in the heating body 31c and spaced apart in the longitudinal direction of the heating body 31c. The first electrode 321c and the second electrode 322c can be configured to extend in the circumferential direction of the heating body 31c. The first electrode 321c is non-closed in the circumferential direction and has a first gap 3211c, and the second electrode 322c is non-closed in the circumferential direction and has a second gap 3221c. In Figure 8In the illustrated embodiment, the first electrode 321c is close to the first end 310c and has a first spacing d61 from the first end 310c. The first electrode 321c and the second electrode 322c have a second spacing d62 therebetween. The second electrode 322c is close to the second end 320c and has a third spacing d63 from the second end 320c.

[0159] In Figure 8 In the illustrated embodiment, the second spacing d62 is greater than the first spacing d61 and / or the third spacing d63. Alternatively, the second spacing d62 is greater than or equal to 1 / 3 of the longitudinal length of the heating body 31c. In operation, a region with greater resistive joule heat generation on the heating body 31c is created.

[0160] It should be noted that the preferred embodiments of the present application are shown and described in the present specification and drawings, but are not limited to the embodiments described in the specification, and further, those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the scope of the claims of the present application.

Claims

1. An aerosol generating device configured to heat an aerosol generating article to generate an aerosol; characterized in that include: a chamber having an open opening; In use, an aerosol-generating article can be at least partially received in or removed from the chamber through the opening; a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first end proximate to the opening and a second end facing away from the first end; A first electrode and a second electrode are arranged on the heating body at intervals along the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend circumferentially along the heating body, at least a portion of the first electrode is opposite to at least a portion of the second electrode in the longitudinal direction of the heating body, and thus, in use, the first electrode and the second electrode guide current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the distance between the second electrode and the first end is less than the distance between the second electrode and the second end.

2. The aerosol generating device according to claim 1, wherein The heating body is a conductive ceramic body.

3. The aerosol generating device according to claim 2, wherein The temperature coefficient of resistance of the material of the heating body is between -1500 and -2500 ppm / °C.

4. The aerosol generating device according to any one of claims 1 to 3, characterized in that The thermal conductivity of the heating body is greater than 20 W / mk.

5. The aerosol generating device according to any one of claims 1 to 3, characterized in that The first electrode and / or the second electrode is in a closed ring shape.

6. The aerosol generating device according to any one of claims 1 to 3, characterized in that The first electrode and / or the second electrode are configured to be non-closed in the circumferential direction; The first electrode has a first notch, and / or the second electrode has a second notch.

7. The aerosol generating device according to claim 6, wherein The first notch and the second notch are staggered in the longitudinal direction of the heating body.

8. The aerosol generating device according to claim 6, wherein The arc of the first notch and / or the second notch extending along the circumferential direction of the heating body is between 0.1π and 0.8π.

9. The aerosol generating device according to claim 6, wherein: The arc of the first electrode and / or the second electrode extending along the circumference of the heating body is between 0.03π and 2π.

10. The aerosol generating device according to claim 6, wherein The first electrode and the second electrode have the same arc extending along the circumference of the heating body; Alternatively, the first electrode and the second electrode have different arcs extending along the circumference of the heating body.

11. The aerosol generating device according to claim 6, wherein The first electrode has at least one first section, and the second electrode has at least one second section; the at least one first section and the at least one second section are opposed to each other in the longitudinal direction of the heating body.

12. The aerosol generating device according to claim 11, wherein The first section and / or the second section has an extension arc of 0.03π to 1.75π in the circumferential direction of the heating body.

13. The aerosol generating device according to claim 11, wherein The first electrode has two spaced-apart first sections, and the second electrode has two spaced-apart second sections.

14. The aerosol generating device according to any one of claims 1 to 3, characterized in that Also includes: A conductive transition bonding layer is formed or arranged between the first electrode and / or the second electrode and the heating body to provide bonding between the first electrode and / or the second electrode and the heating body.

15. The aerosol generating device according to claim 14, wherein The thickness of the transition bonding layer is between 0.01 mm and 1.0 mm.

16. The aerosol generating device according to claim 14, wherein The thermal expansion coefficient of the transition bonding layer is smaller than the thermal expansion coefficient of the first electrode and / or the second electrode.

17. The aerosol generating device according to any one of claims 1 to 3, characterized in that There is a first distance between the first electrode and the first end, a second distance between the first electrode and the second electrode, and a third distance between the second electrode and the second end; the second distance is greater than the first distance, and the second distance is smaller than the third distance.

18. The aerosol generating device according to any one of claims 1 to 3, characterized in that The heating body comprises: a first portion close to or defining the first end; a second portion close to or defining the second end; the first electrode and / or the second electrode are arranged on the first portion and avoid the second portion; When current is conducted to the heating body through the first electrode and the second electrode, the first portion can generate heat by resistive Joule heat, and the second portion generates heat by receiving heat transferred from the first portion.

19. The aerosol generating device according to claim 18, wherein The heating body is free of electrodes for conducting current on the second portion.

20. An aerosol generating device configured to heat an aerosol generating article to generate an aerosol; characterized in that include: a chamber having an open opening; In use, an aerosol-generating article can be at least partially received in or removed from the chamber through the opening; a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; a first electrode and a second electrode disposed on the heating body and spaced apart in a longitudinal direction; the first electrode and the second electrode being arranged to extend along a circumference of the heating body, with at least a portion of the first electrode opposing at least a portion of the second electrode in the longitudinal direction of the heating body, such that, in use, current is guided in the longitudinal direction of the heating body by the first electrode and the second electrode; The first electrode and / or the second electrode is configured to be open in the circumferential direction.

21. An aerosol generating device configured to heat an aerosol generating article to generate an aerosol; characterized in that include: a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use; a heating body made of a conductive ceramic material, surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first portion and a second portion sequentially arranged in a longitudinal direction; A first electrode and a second electrode are arranged on the first portion at intervals in the longitudinal direction and avoid the second portion; The first electrode and the second electrode are arranged to extend along the circumference of the heating body, so that in use, the first electrode and the second electrode conduct current on the first portion, causing the first portion to heat the aerosol-generating article by resistive Joule heating; The second portion generates heat by receiving the heat transferred from the first portion, thereby heating the aerosol-generating article.

22. An aerosol generating device configured to heat an aerosol generating article to generate an aerosol; characterized in that include: a chamber having an open opening; In use, an aerosol-generating article can be at least partially received in or removed from the chamber through the opening; a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; A first electrode and a second electrode are arranged on the heating body at intervals to guide current on the heating body; A conductive transition bonding layer is formed or arranged between the first electrode and / or the second electrode and the heating body to provide bonding between the first electrode and / or the second electrode and the heating body.

23. A heater for an aerosol generating device, characterized in that: include: a first end and a second end facing each other in a longitudinal direction; a tubular heating body extending from the first end to the second end; A first electrode and a second electrode are arranged on the heating body at intervals along the longitudinal direction of the heating body; the first electrode and the second electrode are arranged to extend circumferentially along the heating body, at least a portion of the first electrode is opposite to at least a portion of the second electrode in the longitudinal direction of the heating body, and thus, in use, the first electrode and the second electrode guide current in the longitudinal direction of the heating body; the first electrode is closer to the first end than the second electrode, or the first electrode is located between the first end and the second electrode; the distance between the second electrode and the first end is less than the distance between the second electrode and the second end.

24. A heater for an aerosol generating device, characterized in that: include: a tubular heating body; A first electrode and a second electrode are arranged on the heating body at intervals along the longitudinal direction of the heating body; The first electrode and the second electrode are arranged to extend along the circumference of the heating body, with at least a portion of the first electrode facing at least a portion of the second electrode in the longitudinal direction of the heating body, so that in use, the first electrode and the second electrode guide current in the longitudinal direction of the heating body; The first electrode and / or the second electrode is configured to be open in the circumferential direction.

25. A heater for an aerosol generating device, characterized in that: include: A tubular heating body made of conductive ceramic material; The heating body includes a first part and a second part arranged in sequence in the longitudinal direction; A first electrode and a second electrode are arranged on the first portion at intervals in the longitudinal direction and avoid the second portion; The first electrode and the second electrode are arranged to extend along the circumference of the heating body, so that in use, the first electrode and the second electrode conduct current on the first portion, causing the first portion to heat the aerosol-generating article by resistive Joule heating; The second portion generates heat by receiving the heat transferred from the first portion, thereby heating the aerosol-generating article.

26. A heater for an aerosol generating device, characterized in that: include: a tubular heating body; A first electrode and a second electrode are arranged on the heating body at intervals to guide current on the heating body; A conductive transition bonding layer is formed or arranged between the first electrode and / or the second electrode and the heating body to provide bonding between the first electrode and / or the second electrode and the heating body.

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