Heating needle and aerosol-generating device

Abstract

The utility model provides a heating needle and an aerosol generating device. The heating needle comprises a heating element, an accommodating cavity is defined in the conductive ceramic; at least part of the first electrode is arranged in the accommodating cavity, and the first electrode is in contact with the conductive ceramic; and the second electrode is arranged on the outer surface of the conductive ceramic, so that current flows between the first electrode and the second electrode. The first electrode of the heating needle is arranged in the containing cavity of the conductive ceramic, so that the contact position of the conductive ceramic and the first electrode is not prone to corrosion, and the service life of the heating needle is longer.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of aerosol generation, and in particular to an aerosol generating device and a heating needle. Background Art

[0002] In the aerosol generating device, the aerosol generating product is heated by a heating needle. The material of the heating needle is generally conductive ceramics. Conductive ceramics are a new type of functional material in ceramic materials that has ion conductivity, electron and hole conductivity. It has both metallic conductivity and the structural characteristics, mechanical properties and unique physical and chemical properties of ceramics, such as anti-oxidation, anti-corrosion and high temperature resistance. It has high electrothermal conversion efficiency and high infrared emissivity. Compared with ordinary ceramics, conductive ceramics bake tobacco more evenly, have a better smoke taste, and have a wider application prospect. The contact between the metal positive electrode and the conductive ceramic of the current conductive ceramic heating needle is prone to corrosion due to the large current, high temperature, and frequent contact with highly corrosive smoke and condensed oil, which causes abnormal resistance of the heating needle and even malfunction.

[0003] Application Contents

[0004] To solve the problem that corrosion easily occurs at the contact point between the metal positive electrode of the conductive ceramic heating needle and the conductive ceramic.

[0005] The present application provides a heating needle comprising: a conductive ceramic, wherein a receiving cavity is defined in the conductive ceramic; a first electrode, wherein at least a portion of the first electrode is disposed in the receiving cavity, and the first electrode is in contact with the conductive ceramic; and a second electrode, wherein the second electrode is disposed on an outer surface of the conductive ceramic so that current flows between the first electrode and the second electrode.

[0006] The present application provides a heating needle, wherein one end of the conductive ceramic is tapered.

[0007] The present application provides a heating needle, wherein the inner diameter of the conductive ceramic is 0.5 mm-1.5 mm.

[0008] The present application provides a heating needle, wherein the outer diameter of the conductive ceramic is 2 mm-4 mm.

[0009] The present application provides a heating needle, wherein one end of the first electrode has a conductive pin, and the other end has a conductive terminal, the conductive terminal is connected to the conductive ceramic, and the conductive pin is used to connect to an external circuit.

[0010] The present application provides a heating needle, wherein the accommodating cavity extends along the length direction of the conductive ceramic, one end of the accommodating cavity in the length direction is a closed end, and the other end is an open end;

[0011] The conductive terminal is in contact with the closed end;

[0012] The conductive pin is disposed at the open end.

[0013] The present application provides a heating pin, wherein an insulating layer is provided on the outer surface of the first electrode, and the insulating layer is located between the conductive pin and the conductive terminal.

[0014] The present application provides a heating pin, wherein the insulating layer comprises a polyaromatic ether ketone-ketone resin layer and a polyimide layer.

[0015] The present application provides a heating needle, wherein the difference between the inner diameter of the conductive ceramic and the diameter of the first electrode at the insulating layer is 0.05 mm-0.2 mm.

[0016] The present application provides a heating pin, wherein the distance between the insulating layer and an end of the conductive terminal away from the insulating layer is 0.1 mm-1 mm.

[0017] The present application provides a heating needle, wherein in the length direction of the first electrode, the length of the insulating layer is greater than or equal to 10 mm.

[0018] The present application provides a heating needle, wherein the length of the insulating layer is 1 mm-5 mm in the length direction of the first electrode.

[0019] The present application provides a heating needle, wherein the conductive ceramic and the first electrode or the second electrode are connected by welding, riveting, or bonding.

[0020] The present application provides a heating needle, wherein the second electrode is a printed silver paste electrode; or, the second electrode is a closed ring, or, the second electrode is a ring with a gap in the circumferential direction; or, the second electrode is tubular with one end open and the other end closed, and the second electrode is sheathed on the conductive ceramic.

[0021] The present application provides a heating needle, wherein a depression is provided on the outer surface of the conductive ceramic, and the second electrode is embedded in the depression.

[0022] The present application provides a heating needle, wherein the recess extends along the circumferential direction of the conductive ceramic and is ring-shaped.

[0023] The present application provides a heating needle, wherein the conductive ceramic includes zinc oxide conductive ceramic, metal-based conductive ceramic, oxide electronic conductive ceramic, nitride conductive ceramic, boride conductive ceramic or carbide conductive ceramic.

[0024] The present application provides a heating needle, wherein the first electrode comprises copper, copper alloy or silver.

[0025] The present application provides a heating needle, wherein the second electrode includes beryllium copper, titanium copper, phosphor copper, silver or gold.

[0026] The present application provides an aerosol generating device, comprising a battery assembly and the above-mentioned heating needle, wherein the battery assembly provides electrical energy for the heating needle.

[0027] In the present application, the first electrode of the heating needle is arranged in the accommodating cavity of the conductive ceramic, so that the contact point between the conductive ceramic and the first electrode is not easily corroded, and the service life of the heating needle is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0029] Figure 1 A schematic diagram of a heating needle according to an embodiment of the present application;

[0030] Figure 2 A schematic diagram of a conductive ceramic according to an embodiment of the present application;

[0031] Figure 3 A schematic diagram of a first electrode according to an embodiment of the present application;

[0032] Figure 4 A schematic diagram of a second electrode according to an embodiment of the present application;

[0033] Figure 5 A schematic diagram of a heating needle according to an embodiment of the present application;

[0034] Figure 6 A schematic diagram of a conductive ceramic according to an embodiment of the present application;

[0035] Figure 7 A schematic diagram of a first electrode according to an embodiment of the present application;

[0036] Figure 8 A schematic diagram of a second electrode according to an embodiment of the present application;

[0037] Fig. 9 This is a schematic diagram of an aerosol generating device according to an embodiment of the present application.

[0038] In the figure:

[0039] 10. Fever needle;

[0040] 1. Conductive ceramic; 11. Accommodating cavity; 12. Depression;

[0041] 2. first electrode; 21. conductive pin; 22. conductive terminal; 23. insulating layer;

[0042] 3. A second electrode;

[0043] 20. Battery components;

[0044] 100. Aerosol generating device. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or suggesting the quantity or order of the indicated technical features relative to importance or implicitly indicating. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative position relationship or movement between the components under a certain specific posture (as shown in the accompanying drawings), and if the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or equipment comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be one or more central elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0049] An embodiment of the present application provides a heating needle 10, comprising: a conductive ceramic 1, wherein a receiving cavity 11 is defined in the conductive ceramic 1; a first electrode 2, wherein at least a portion of the first electrode 2 is disposed in the receiving cavity 11, and the first electrode 2 is in contact with the conductive ceramic 1; and a second electrode 3, wherein the second electrode 3 is disposed on the outer surface of the conductive ceramic 1 so that current flows between the first electrode 2 and the second electrode 3.

[0050] In the present application, the first electrode 2 of the heating needle 10 is arranged in the accommodating cavity 11 of the conductive ceramic 1, so that the contact point between the conductive ceramic 1 and the first electrode 2 is not easily corroded, and the service life of the heating needle 10 is longer.

[0051] In one embodiment of the present application, the first electrode 2 serves as the positive electrode and the second electrode 3 serves as the negative electrode. Current flows out from the first electrode 2 and flows to the second electrode 3 through the conductive ceramic 1. Since the first electrode 2 is located in the accommodating cavity 11 of the conductive ceramic 1, the risk of leakage is avoided. In addition, the first electrode 2 serving as the positive electrode is located in the accommodating cavity 11 of the conductive ceramic 1 without contacting the aerosol generating product or directly contacting the smoke and the smoke oil, thereby avoiding corrosion between the conductive ceramic 1 and the first electrode 2.

[0052] The present application provides a heating needle, and the conductive ceramic 1 includes zinc oxide conductive ceramic, metal-based conductive ceramic, oxide electronic conductive ceramic, nitride conductive ceramic, boride conductive ceramic or carbide conductive ceramic. The conductive ceramic 1 has both the conductivity of the metal state and the structural characteristics, mechanical properties and unique physical and chemical properties of ceramics, such as anti-oxidation, anti-corrosion and high temperature resistance. At the same time, relative to quartz glass, it has better toughness and tensile and bending strength. It has good conductivity throughout the body. Therefore, except for the electrode position, the rest of the parts do not need to be specially coated with conductive coating materials, so the process is relatively simple. It also has good infrared emissivity, strong infrared penetration ability, high heating efficiency, and can effectively reduce the power consumption of a single cigarette.

[0053] In one embodiment of the present application, one end of the conductive ceramic 1 is tapered to facilitate the insertion of the heating needle 10 into the aerosol generating product. In one embodiment of the present application, the inner diameter of the conductive ceramic 1 is 0.5mm-1.5mm. In one embodiment of the present application, the inner diameter of the conductive ceramic is 0.5mm, 0.8mm, 1.0mm, 1.2mm or 1.5mm. In one embodiment of the present application, the inner diameter of the conductive ceramic 1 is matched with the diameter of the first electrode 2 so that the first electrode 2 can be accommodated in the accommodating cavity of the conductive ceramic 1. In one embodiment of the present application, the accommodating cavity 11 of the conductive ceramic 1 is cylindrical, and correspondingly, the first electrode 2 is also substantially cylindrical.

[0054] In one embodiment of the present application, the outer diameter of the conductive ceramic 1 is 2 mm-4 mm. In one embodiment of the present application, the outer diameter of the conductive ceramic 1 is 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm. In one embodiment of the present application, the outer diameter of the conductive ceramic 1 is adapted to the diameter of the aerosol generating article, so that the conductive ceramic 1 can be inserted into the aerosol generating article. In one embodiment of the present application, the height of the conductive ceramic 1 is 1 mm-5 mm greater than the length of the adapted aerosol generating article, so that the conductive ceramic 1 can be fully inserted into the aerosol generating article, thereby heating the aerosol generating article.

[0055] In one embodiment of the present application, one end of the first electrode 2 has a conductive pin 21, and the other end has a conductive terminal 22, the conductive terminal is connected to the conductive ceramic 1, and the conductive pin 21 is used to connect to an external circuit. In one embodiment of the present application, the accommodating cavity 11 extends along the length direction of the conductive ceramic 1, one end of the accommodating cavity 11 in the length direction is a closed end, and the other end is an open end, the conductive terminal 22 is in contact with the closed end, and the conductive pin 21 is provided at the open end.

[0056] In one embodiment of the present application, an insulating layer 23 is provided on the outer surface of the first electrode 2, and the insulating layer 23 is located between the conductive pin 21 and the conductive terminal 22. In one embodiment of the present application, an insulating layer is provided in the middle of the first electrode 2, and both ends of the first electrode 2 are exposed, serving as the conductive pin 21 and the conductive terminal 22, respectively.

[0057] In one embodiment of the present application, the insulating layer 23 includes a polyaromatic ether ketone-ketone resin layer and a polyimide layer. The insulating layer 23 has good high temperature resistance, still has good insulation performance in a high temperature environment, and the structure is relatively stable at high temperatures. In one embodiment of the present application, the difference between the inner diameter of the conductive ceramic 1 and the diameter of the first electrode 2 at the insulating layer 23 is 0.05mm-0.2mm, so that the first electrode 2 can be installed in the accommodating cavity 11 of the conductive ceramic 1.

[0058] In one embodiment of the present application, the distance between the insulating layer 23 and the end of the conductive terminal 22 away from the insulating layer 23 is 0.1 mm-1 mm. That is, the end of the first electrode 2 connected to the conductive ceramic 1 is not provided with the insulating layer 23, and the exposed length is 0.1 mm-1 mm, which facilitates the connection between the conductive terminal 22 and the conductive ceramic 1.

[0059] In one embodiment of the present application, the conductive ceramic 1 and the first electrode 2 or the second electrode 3 are connected by welding, riveting, or bonding. When the conductive ceramic 1 and the conductive terminal 22 are connected by welding, the contact point is usually the end surface where the two are in contact; when the conductive ceramic 1 and the conductive terminal 22 are connected by riveting, the contact point is usually the riveted structure set at the ends of the two; when the conductive ceramic 1 and the first electrode 2 are connected by bonding, the conductive ceramic 1 and the first electrode 2 are bonded by conductive glue, and the conductive glue covers the end of the first electrode 2 that is not covered by the insulating layer 23. At this time, the contact area between the conductive ceramic 1 and the first electrode 2 is larger, the contact resistance is smaller, and the conductive effect is good.

[0060] In one embodiment of the present application, when the conductive ceramic 1 and the conductive terminal 22 are connected by welding, a groove is formed at the conductive terminal 22 near the insulating layer 23 after welding. In one embodiment of the present application, the groove is annular. The groove formed after welding is formed due to the necking phenomenon of the laser welding cross section during the welding process.

[0061] In one embodiment of the present application, the second electrode 3 is a printed silver paste electrode, which can be connected to an external circuit. Silver paste is a viscous slurry composed of a mechanical mixture of high-purity (99.9%) metallic silver particles, adhesives, solvents, and additives. Silver paste can be divided into silver oxide paste, silver carbonate paste, and molecular silver paste according to the form of silver. Silver paste is divided into printed silver paste, sprayed silver paste, etc. according to the coating method. The silver paste electrode can be set on the surface of the conductive ceramic 1 by printing, spraying and other processes. The silver paste electrode formed on the surface of the conductive ceramic 1 by printing and spraying is usually thinner.

[0062] In one embodiment of the present application, the second electrode 3 is a closed ring, or the second electrode 3 is a ring with a gap in the circumferential direction. In one embodiment of the present application, a recess 12 is provided on the outer surface of the conductive ceramic 1, and the second electrode 3 is embedded in the recess 12. In one embodiment of the present application, the recess 12 extends along the circumferential direction of the conductive ceramic 1 and is annular. In one embodiment of the present application, the recess 12 is only a recess 12 with a circular or other polygonal cross section, and the second electrode 3 can be arranged in the recess 12.

[0063] In one embodiment of the present application, a closed annular or notched second electrode 3 is disposed in the depression, and the outer surface of the conductive ceramic 1 of the heating needle 10 after the second electrode 3 is disposed and the outer surface of the second electrode 3 are substantially on the same curved surface, which is conducive to forming the consistency of the outer surface of the heating needle 10, making it more convenient to install the heating needle 10 to the aerosol generating device 100. In one embodiment of the present application, a closed annular or notched second electrode 3 is disposed on the outer surface of the conductive ceramic 1, and the outer surface of the conductive ceramic 1 of the heating needle 10 after the second electrode 3 is disposed and the outer surface of the second electrode 3 are not on the same curved surface. In one embodiment of the present application, when the second electrode 3 is annular with a notch, the second electrode 3 can undergo a certain deformation, and the second electrode 3 can be assembled with the conductive ceramic 1 by interference fit.

[0064] In one embodiment of the present application, the length of the insulating layer 23 is greater than or equal to 10 mm in the length direction of the first electrode 1. In one embodiment of the present application, when the second electrode 3 is a closed ring or a ring with a gap, and the length of the insulating layer is greater than or equal to 10 mm, at this time, the exposed length of the first electrode 2 is small, the first electrode 2 is connected to the conductive ceramic 1 by welding or riveting, and the distance between the insulating layer 23 and the conductive terminal 22 is 0.1 mm-1 mm. At this time, the current flowing to the heating needle 10 passes through the first electrode 2, reaches the connection between the conductive ceramic 1 and the first electrode 2, and then flows in the length direction of the conductive ceramic 1 to reach the third electrode 3.

[0065] In one embodiment of the present application, the second electrode 3 is tubular, with one end open and the other end closed, and the second electrode 3 is sheathed on the conductive ceramic 1. In one embodiment of the present application, in the length direction of the first electrode 1, the length of the insulating layer 23 is 1mm-5mm. In one embodiment of the present application, when the second electrode 3 is tubular, with one end open and the other end closed, and the second electrode 3 is sheathed on the conductive ceramic 1, the length of the insulating layer 23 is 1mm-5mm, the exposed length of the first electrode 2 is large, the contact area between the first electrode 2 and the conductive ceramic 1 is large, and the first electrode 2 is bonded to the conductive ceramic 1 by conductive glue. At this time, the current flowing to the heating needle 10 passes through the first electrode 2, perpendicular to the length direction of the heating needle 10, and flows from the first electrode 2 to the second electrode 3.

[0066] In one embodiment of the present application, the first electrode 2 includes copper, copper alloy or silver. In one embodiment of the present application, the first electrode 2 is copper or copper alloy, and the surface of the first electrode 2 in contact with the conductive ceramic 1 is plated with silver to reduce the contact resistance between the first electrode 2 and the conductive ceramic 1 and increase the conductive properties of the first electrode 2 and the conductive ceramic 1. In one embodiment of the present application, the first electrode 2 is silver.

[0067] In one embodiment of the present application, the second electrode 3 includes beryllium copper, titanium copper, phosphor copper, silver or gold. In one embodiment of the present application, the second electrode 3 is a copper alloy, and the surface is plated with gold or silver to reduce the contact resistance between the second electrode 3 and the conductive ceramic 1 and increase the conductivity of the second electrode 3 and the conductive ceramic 1. In one embodiment of the present application, the second electrode 3 is silver.

[0068] The present application provides an aerosol generating device 100 , comprising a battery assembly 20 and the above-mentioned heating needle 10 , wherein the battery assembly 20 provides electrical energy for the heating needle 10 .

[0069] One embodiment of the present application provides a method of heating an aerosol generating product such as a cigarette rather than burning it, thereby causing at least one component of the aerosol generating product to volatilize or release to form an aerosol for inhalation.

[0070] In an optional embodiment, the aerosol generating product preferably uses a tobacco-containing material that releases volatile compounds from the substrate when heated; or it can also be a non-tobacco material suitable for electrically heated smoking. The aerosol generating product preferably uses a solid substrate, which can include one or more of powder, particles, fragments, strips or sheets of one or more of herb leaves, tobacco leaves, homogenized tobacco, and expanded tobacco; or, the solid substrate can contain additional tobacco or non-tobacco volatile flavor compounds to be released when the substrate is heated.

[0071] When the aerosol generating article is received in the aerosol generating device 100, it is advantageous for a portion of the article to be exposed outside the aerosol generating device 100, such as a filter tip, for inhalation by a user.

[0072] The aerosol generating device 100 of one embodiment of the present application is generally configured in a longitudinal shape. The aerosol generating device 100 includes:

[0073] The housing, which basically defines the outer surface of the aerosol generating device 100, has a proximal end and a distal end opposite to each other along the length direction; in use, the proximal end is the end close to the user for easy operation of containing the aerosol generating product and inhalation; the distal end is the end away from the user.

[0074] In some examples, the housing can be formed of a metal or alloy such as stainless steel, aluminum, etc. Other suitable materials include various plastics (eg, polycarbonate), metal-plating over plastic, ceramics, and the like.

[0075] The aerosol generating device 100 further includes a circuit and a charging interface. In some embodiments of the present application, the battery assembly 20, the circuit and the charging interface are formed in one piece, and the aerosol generating device 100 is a common one-piece device.

[0076] The circuit can control the overall operation of the aerosol generating device 100. In detail, the circuit controls not only the operation of the battery assembly 20 and the heating needle 10, but also the operation of other components in the aerosol generating device 100. In addition, the circuit can determine whether the aerosol generating device 100 can be operated by checking the status of the components of the aerosol generating device 100.

[0077] The circuit includes at least one control unit. The control unit may include, but is not limited to, a combination of a microcontroller and a memory for storing a program executable in the microcontroller, and the memory may be integrated in the microcontroller or independent of the microcontroller.

[0078] The battery assembly 20 provides power for operating the aerosol generating device 100. For example, the battery assembly 20 can provide power to heat the heating needle 10, and can provide power required for operating the circuit. In addition, the battery assembly 20 can provide power required for operating the sensor, motor, etc. provided in the aerosol generating device 100.

[0079] The battery assembly 20 may be, but is not limited to, lithium iron phosphate (LiFePO 4 For example, the battery assembly 20 may be a lithium cobalt oxide (LiCoO 2 ) battery cell or lithium titanate battery cell. The battery assembly 20 can be a rechargeable battery cell.

[0080] The charging interface, when the charging interface is electrically connected to the external power supply device, for example, the external power adapter is inserted into the charging interface, the charging interface outputs a certain charging voltage to the battery assembly 20 to charge the battery assembly 20. When charging is completed, the electrical connection between the charging interface and the external power supply device can be disconnected, that is, the external power adapter is unplugged from the charging interface.

[0081] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but are not limited to the embodiments described in the specification. Furthermore, it is possible for a person of ordinary skill in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present application.

Claims

1. A heating needle, characterized in that: include: A conductive ceramic, wherein a receiving cavity is defined in the conductive ceramic; a first electrode, at least a portion of which is disposed in the accommodation cavity, and the first electrode is in contact with the conductive ceramic; The second electrode is disposed on an outer surface of the conductive ceramic so that current flows between the first electrode and the second electrode.

2. The heating needle according to claim 1, characterized in that: One end of the conductive ceramic is tapered.

3. The heating needle according to claim 1, characterized in that: The inner diameter of the conductive ceramic is 0.5 mm-1.5 mm.

4. The heating needle according to claim 1, characterized in that: The outer diameter of the conductive ceramic is 2 mm-4 mm.

5. The heating needle according to claim 1, characterized in that: One end of the first electrode has a conductive pin, and the other end has a conductive terminal. The conductive terminal is connected to the conductive ceramic, and the conductive pin is used to connect to an external circuit.

6. The heating needle according to claim 5, characterized in that: The accommodating cavity extends along the length direction of the conductive ceramic, one end of the accommodating cavity in the length direction is a closed end, and the other end is an open end; The conductive terminal is in contact with the closed end; The conductive pin is disposed at the open end.

7. The heating needle according to claim 6, characterized in that: An insulating layer is provided on the outer surface of the first electrode, and the insulating layer is located between the conductive pin and the conductive terminal.

8. The heating needle according to claim 7, characterized in that: The insulating layer includes a polyaryletherketone-ketone resin layer and a polyimide layer.

9. The heating needle according to claim 7, characterized in that: The difference between the inner diameter of the conductive ceramic and the diameter of the first electrode at the insulating layer is 0.05 mm to 0.2 mm.

10. The heating needle according to claim 7, characterized in that: The distance between the insulating layer and one end of the conductive terminal away from the insulating layer is 0.1 mm-1 mm.

11. The heating needle according to claim 7, characterized in that: In the length direction of the first electrode, the length of the insulating layer is greater than or equal to 10 mm.

12. The heating needle according to claim 7, characterized in that: In the length direction of the first electrode, the length of the insulating layer is 1 mm-5 mm.

13. The heating needle according to claim 1, characterized in that: The conductive ceramic and the first electrode or the second electrode are connected by welding, riveting, or bonding.

14. The heating needle according to claim 1, characterized in that: The second electrode is a printed silver paste electrode; Alternatively, the second electrode is a closed ring. Alternatively, the second electrode is in the shape of a ring having a gap in the circumferential direction; Alternatively, the second electrode is in a tubular shape with one end open and the other end closed, and the second electrode is sheathed on the conductive ceramic.

15. The heating needle according to claim 1, characterized in that: A recess is provided on the outer surface of the conductive ceramic, and the second electrode is embedded in the recess.

16. The heating needle according to claim 15, characterized in that: The recess extends along the circumferential direction of the conductive ceramic and has a ring shape.

17. The heating needle according to claim 1, characterized in that: The conductive ceramic includes zinc oxide conductive ceramic, metal-based conductive ceramic, oxide electronic conductive ceramic, nitride conductive ceramic, boride conductive ceramic or carbide conductive ceramic.

18. The heating needle according to claim 1, characterized in that: The first electrode includes copper, copper alloy or silver.

19. The heating needle according to claim 1, characterized in that: The second electrode includes beryllium copper, titanium copper, phosphor copper, silver or gold.

20. An aerosol generating device, characterized in that: It comprises a battery assembly and a heating needle as described in any one of claims 1 to 19, wherein the battery assembly provides electrical energy for the heating needle.

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