Heating body, heating assembly, and aerosol generating device

Abstract

The present application provides a heating body, a heating assembly, and an aerosol generating device. The heating body is a semiconductor conductive ceramic member. The thermal conductivity of the semiconductor conductive ceramic member is 5 W / (m•K)-45 W / (m•K). The semiconductor ceramic member itself has a certain supporting function, and the thermal conductivity can be regulated according to requirements, so that an aerosol generating product to be heated can be heated to a preset temperature within a short time period, thereby providing a good taste for users.

Description

Heating body, heating assembly and aerosol generating device

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411497298.1, filed on October 24, 2024, and entitled “Heating body, heating assembly and aerosol generating device”, the content of which is incorporated herein by reference in its entirety.

[0003] TECHNICAL FIELD

[0004] The present application relates to the field of aerosol generating technology, in particular to a heating body in a heating assembly of an aerosol generating device. BACKGROUND

[0005] The heating assembly of the heating but not burning aerosol generating device can heat the heat source by resistance heating, heat radiation and heat convection, etc. The resistance heating is usually used to transfer heat from the heat source to the aerosol generating article. However, the heating body of the resistance heating as the heat source cannot meet the user's demand for temperature field distribution and temperature rise speed at present.

[0006] SUMMARY

[0007] To solve the problem that the user's demand for temperature field distribution and temperature rise speed cannot be met in the prior art.

[0008] The present application provides a heating body, the heating body is a semi-conductive ceramic piece, and the thermal conductivity of the semi-conductive ceramic is 5 W / (m•K)-45 W / (m•K).

[0009] The present application provides a heating body, the thermal conductivity of the semi-conductive ceramic is 6 W / (m•K)-30 W / (m•K).

[0010] The present application provides a heating body, the resistivity of the semi-conductive ceramic is 0.01 Ω.cm-1 Ω.cm; and / or the resistivity of the semi-conductive ceramic is 0.01 Ω.cm-0.5 Ω.cm.

[0011] The present application provides a heating body, the temperature coefficient of resistance of the semi-conductive ceramic is-3000 ppm / ℃-1000 ppm / ℃; and / or the temperature coefficient of resistance of the semi-conductive ceramic is-2800 ppm / ℃-0 ppm / ℃.

[0012] The present application provides a heating body, the normal total emissivity of the semi-conductive ceramic is 0.8-0.96.

[0013] The application provides a heating body, the three-point bending strength of the semiconductor conductive ceramic is greater than or equal to 25 N; and / or the three-point bending strength of the semiconductor conductive ceramic is greater than or equal to 40 N.

[0014] The application provides a heating assembly, comprising a first electrode, a second electrode and a heating body made of the semiconductor conductive ceramic according to claims 1-5; the heating body has an opening for inserting an aerosol generating article, the heating body defines a heating cavity for accommodating the aerosol generating article, the opening and the heating cavity are in communication; the heating body comprises a first end close to the opening and a second end away from the first end; the first electrode and the 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 used to guide the current in the longitudinal direction of the heating body when the heating assembly is in use, and the first electrode is located between the first end and the second electrode.

[0015] The application provides a heating assembly, the wall thickness of the heating body is 0.5 mm-0.7 mm.

[0016] The application provides a heating assembly, the first electrode and the second electrode extend along the circumference of the heating body.

[0017] The distance between the second electrode and the first end is less than the distance between the second electrode and the second end.

[0018] The application provides a heating assembly, the first electrode and / or the second electrode are closed annular.

[0019] The application provides a heating assembly, the first electrode and / or the second electrode are configured to be non-closed in the circumferential direction, and a notch is arranged on the corresponding electrode.

[0020] The application provides a heating assembly, the first electrode and the second electrode both have notches, the notch on the first electrode is a first notch, the notch on the second electrode is a second notch, and the first notch and the second notch are arranged staggered in the longitudinal direction of the heating body.

[0021] The application provides a heating assembly, the notch extends along an arc of 0.1π-0.8π in the circumferential direction of the heating body.

[0022] The application provides a heating assembly, the first electrode and / or the second electrode extend along an arc of π-2π in the circumferential direction of the heating body.

[0023] The application provides a heating assembly, the first electrode and the second electrode extend along the same arc in the circumferential direction of the heating body.

[0024] Alternatively, the first electrode and the second electrode have different arc lengths extending circumferentially along the heating body.

[0025] The application provides a heating assembly, further comprising:

[0026] A conductive transition bonding layer is formed or arranged between the first electrode and / or the second electrode and the heating body for providing bonding between the first electrode and / or the second electrode and the heating body.

[0027] The application provides a heating assembly, the first electrode has a first spacing from the first end, the first electrode has a second spacing from the second electrode, and the second electrode has a third spacing from the second end; the second spacing is greater than or equal to the first spacing, and the second spacing is less than or equal to the third spacing.

[0028] The application provides a heating assembly, the heating body comprises:

[0029] A first portion defines the first end;

[0030] A second portion defines the second end, the first electrode and / or the second electrode are arranged on the first portion and away from the second portion;

[0031] When an electric current is directed on 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.

[0032] The application provides a heating assembly, the first electrode and the second electrode are arranged spaced apart on the heating body for directing an electric current on at least a portion of the heating body;

[0033] At least one conductive track is formed on or integrated with the heating body; the at least one conductive track is arranged to extend from the first electrode to the second electrode and can be applied with a voltage by the first electrode and the second electrode to generate resistive Joule heat.

[0034] The application provides an aerosol generating device, comprising a battery assembly and the above-mentioned heating assembly, the battery assembly provides electric energy for the heating assembly.

[0035] The semiconductor conductive ceramic provided by the application has a thermal conductivity of 5 W / (m·K)-45 W / (m·K), and the semiconductor ceramic itself has a certain supporting effect. The thermal conductivity can be adjusted according to the needs, so that the aerosol generating article to be heated can be heated to a preset temperature in a shorter time, and the user can obtain a good taste. BRIEF DESCRIPTION OF DRAWINGS

[0036] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which do not limit the scope of embodiments, in which like references indicate similar elements. Figures in the drawings are in schematic, not to scale.

[0037] Fig. 1 is a temperature field distribution of a heat generating component in a working condition (1) of the present application when the heat generating component reaches the highest temperature;

[0038] Fig. 2 is a temperature field distribution of a heat generating component in a working condition (2) of the present application when the heat generating component reaches the highest temperature;

[0039] Fig. 3 is a temperature field distribution of a heat generating component in a working condition (3) of the present application when the heat generating component reaches the highest temperature;

[0040] Fig. 4 is a temperature field distribution of a heat generating component in a working condition (4) of the present application when the heat generating component reaches the highest temperature;

[0041] Fig. 5 is a temperature field distribution of a heat generating component in a working condition (5) of the present application when the heat generating component reaches the highest temperature;

[0042] Fig. 6 is a temperature field distribution of a heat generating component in a working condition (6) of the present application when the heat generating component reaches the highest temperature;

[0043] Fig. 7 is a temperature field distribution of a heat generating component in a working condition (7) of the present application when the heat generating component reaches the highest temperature;

[0044] Fig. 8 is a temperature field distribution of a heat generating component in a working condition (8) of the present application when the heat generating component reaches the highest temperature;

[0045] Fig. 9 is a temperature field distribution of a heat generating component in a working condition (9) of the present application when the heat generating component reaches the highest temperature;

[0046] Fig. 10 is a temperature field distribution of a heat generating component in a working condition (10) of the present application when the heat generating component reaches the highest temperature;

[0047] Fig. 11 is a temperature rising speed difference of the highest temperature point of a heat generating component in working conditions (1) to (10) of the present application;

[0048] Fig. 12 is a longitudinal temperature field distribution monitoring point position of a heat generating component of the present application when the heat generating component reaches the highest temperature of 300°C;

[0049] Fig. 13 is a longitudinal temperature difference between monitoring point 5 and monitoring point 1 in Fig. 5 of the present application;

[0050] Fig. 14 is a temperature change of monitoring point 5 over time under different thermal conductivities of the present application;

[0051] Fig. 15 is a schematic diagram of a heat generating component of an embodiment of the present application;

[0052] Fig. 16 is a schematic diagram of a heat generating component of an embodiment of the present application;

[0053] FIG. 17 is a schematic view of a heating assembly according to an embodiment of the present application;

[0054] FIG. 18 is a schematic view of a heating assembly according to an embodiment of the present application;

[0055] FIG. 19 is a schematic view of an aerosol generating device according to an embodiment of the present application.

[0056] In the drawings:

[0057] 10, heating assembly;

[0058] 1, first electrode; 11, first notch;

[0059] 2, second electrode; 21, second notch;

[0060] 3, heating body; 31, opening; 32, heating cavity; 33, first end; 34, second end; 35, first portion; 36, second portion;

[0061] 4, conductive trace;

[0062] 20, battery assembly;

[0063] 100, aerosol generating device. Embodiments of the present application

[0064] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0065] The terms "first", "second", "third" in the present application are only used for descriptive purposes, and cannot be understood as indicating or implying the importance or implicitly indicating the number or order of the indicated technical features. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship or movement between the components, and if the specific posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0066] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0067] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In cases where one element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar expressions are for illustrative purposes only and are not intended to be limiting.

[0068] The application provides a heating body, which can be made of a semiconductive ceramic. That is, the heating body can be a semiconductive ceramic piece. The semiconductive ceramic can have a thermal conductivity of 5 W / (m•K) - 45 W / (m•K).

[0069] The semiconductive ceramic provided by the application has a thermal conductivity of 5 W / (m•K) - 45 W / (m•K), and the semiconductive ceramic itself has a certain supporting effect. The thermal conductivity can be adjusted according to requirements, so that the aerosol generating article to be heated can be heated to a preset temperature in a relatively short time, and a user can obtain a good taste.

[0070] In some examples, the semiconductive ceramic can have a thermal conductivity of 6 W / (m•K) - 30 W / (m•K). In one embodiment of the application, the semiconductive ceramic has a thermal conductivity of 10 W / (m•K) - 27 W / (m•K). For example, the semiconductive ceramic can have a thermal conductivity of 10 W / (m•K), 12 W / (m•K), 15 W / (m•K), 18 W / (m•K), 20 W / (m•K), 22 W / (m•K), 25 W / (m•K), 27 W / (m•K), 30 W / (m•K), 33 W / (m•K), 35 W / (m•K), 37 W / (m•K), or 40 W / (m•K).

[0071] In one embodiment of the application, the aerosol generating article has an overall appearance of a long, cylindrical configuration, such as a cylindrical shape similar to a cigarette. Alternatively, in some other variant embodiments, the aerosol generating article can have a long, elliptical cylindrical shape, a square cylindrical shape, a polygonal cylindrical shape, etc. In some embodiments, the aerosol generating article can have an appearance that mimics the appearance of a conventional, lightable, smokeable cigarette.

[0072] In one embodiment of the present application, the aerosol generating article includes an aerosol generating substrate; the aerosol generating substrate is used to describe a substrate capable of releasing volatile compounds upon heating, which can form an aerosol. The aerosol described herein can be visible or invisible, and can include vapors (e.g., fine particles of a substance that are in a gaseous state, which are normally liquid or solid at room temperature), as well as gases and droplets of condensed vapors. The aerosol generating substrate can include, for example, one or more of a powder, a granule, a pellet, a piece, a strand, a strip, or a sheet, which contains one or more of dried flowers or leaves, grass leaves, tobacco leaves, tobacco stems, expanded tobacco, and homogenized tobacco.

[0073] In one embodiment of the present application, the aerosol generating article includes a filter segment and a smoking segment, the filter segment is used to output after filtering the aerosol, the filter segment can generally include a porous material such as cellulose acetate. The smoking segment is inserted into the heating cavity 32 of the heating assembly 10 to heat the smoking segment to generate an aerosol.

[0074] The temperature rising speed and longitudinal temperature field distribution of the heating assembly 10 under the following 10 working conditions are tested by using multi-physical field simulation software.

[0075] Working condition (1): constant power 23W, thermal conductivity 37W / (m•K), electrical conductivity 1.5×10 3 S / m.

[0076] Working condition (2): constant power 23W, thermal conductivity 27W / (m•K), electrical conductivity 1.5×10 3 S / m.

[0077] Working condition (3): constant power 23W, thermal conductivity 27W / (m•K), electrical conductivity 7.5×10 2 S / m.

[0078] Working condition (4): constant power 23W, thermal conductivity 5W / (m•K), electrical conductivity 7.5×10 2 S / m;

[0079] Working condition (5): constant power 23W, thermal conductivity 6W / (m•K), electrical conductivity 7.5×10 2 S / m;

[0080] Working condition (6): constant power 23W, thermal conductivity 10W / (m•K), electrical conductivity 7.5×10 2 S / m;

[0081] Working condition (7): constant power 23W, thermal conductivity 20W / (m•K), electrical conductivity 7.5×10 2 S / m;

[0082] Operating condition (8): Constant power 23W, thermal conductivity 27W / (m•K), electrical conductivity 7.5×10 2 S / m;

[0083] Operating condition (9): Constant power 23W, thermal conductivity 30W / (m•K), electrical conductivity 7.5×10 2 S / m;

[0084] Operating condition (10): Constant power 23W, thermal conductivity 45W / (m•K), electrical conductivity 7.5×10 2 S / m.

[0085] In operating conditions (1)-(10), the temperature field distribution when the heating component 10 reaches its highest temperature is shown in Figures 1-10. As can be seen from Figures 1-10, the highest temperature of the heating component 10 is located between the first electrode 1 and the second electrode 2.

[0086] Figure 11 illustrates the difference in the heating rate of the highest temperature point of the heating component 10 under operating conditions (1) to (10). As can be seen from Figure 11, the heating rate of the highest temperature point of the heating component 10 differs under different operating conditions.

[0087] Figure 12 shows the location of monitoring points for the longitudinal temperature field distribution when the heating component 10 reaches its maximum temperature of 300℃. Five monitoring points are set in Figure 12, namely measuring point 1, measuring point 2, measuring point 3, measuring point 4, and measuring point 5. The distribution location and spacing of measuring points 1 to 5 are marked in Figure 12 as an example.

[0088] Figure 13 shows the longitudinal temperature difference between monitoring point 5 and monitoring point 1 in Figure 12.

[0089] Figure 13 illustrates the longitudinal temperature difference between monitoring point 5 and monitoring point 1 at the instantaneous point of maximum temperature in operating conditions (1)-(10). When the thermal conductivity is 5W / (m•K), 6W / (m•K), 10W / (m•K), 20W / (m•K), 27W / (m•K), 30W / (m•K), 37W / (m•K) and 45W / (m•K), the longitudinal temperature differences between monitoring point 5 and monitoring point 1 at the instantaneous point of maximum temperature are 271.3℃, 271.0℃, 268.4℃, 254.3℃, 237.8℃, 229.7℃, 205.6℃ and 177.3℃, respectively.

[0090] Figure 14 shows the temperature change of monitoring point 5 over time under different thermal conductivity conditions. Based on operating conditions (1) to (10), it can be seen that when the thermal conductivity is 5 W / (m•K), the time for the highest temperature to reach 300℃ from room temperature of 25℃ is 1.8s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 271.3℃; when the thermal conductivity is 6 W / (m•K), the time for the highest temperature to reach 300℃ from room temperature of 25℃ is 1.9s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 271.0℃; when the thermal conductivity is 10 W / (m•K), the time for the highest temperature to reach 300℃ from room temperature of 25℃ is 2.25s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 268.4℃; when the thermal conductivity is 20 W / (m•K), the time for the highest temperature to reach 300℃ from room temperature of 25℃ is 3.42s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 254.3℃; when the thermal conductivity is 27 ... When the thermal conductivity is W / (m•K), the time it takes for the highest temperature to reach 300℃ from room temperature (25℃) is 4.4s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 237.8℃; when the thermal conductivity is 30 W / (m•K), the time it takes for the highest temperature to reach 300℃ from room temperature (25℃) is 4.86s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 229.7℃; when the thermal conductivity is 37 W / (m•K), the time it takes for the highest temperature to reach 300℃ from room temperature (25℃) is 5.7s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 205.6℃; when the thermal conductivity is 45 W / (m•K), the time it takes for the highest temperature to reach 300℃ from room temperature (25℃) is 6.6s, and the temperature difference between measuring point 5 and measuring point 1 at this moment is 177.3℃. Analysis shows that under the same constant power input of 23W, the thermal conductivity of the semiconductor ceramic decreases from 45 W / (m•K) to 5 W / (m•K), and the time to reach the highest temperature of 300℃ is shortened from 6.6s to 1.8s. This means that reducing the thermal conductivity increases the heating rate. In other words, the higher the thermal conductivity, the longer it takes to reach the same highest temperature with the same power input, and the more uniform the temperature field distribution along the longitudinal direction.

[0091] Based on the analysis of operating conditions (2) and (3), it can be seen that maintaining the thermal conductivity at 27 W / (m•K) and reducing the electrical conductivity from 1.5×10 3 S / m decreased to 7.5×10 2 S / m, the heating rate remains constant.

[0092] Analysis of the test data from combined operating conditions (1) to (10) unexpectedly revealed that the value of thermal conductivity has a substantial impact on the rate of temperature rise. By selecting a range of thermal conductivity values, the temperature rise rate requirements of the aerosol generation matrix can be met. Furthermore, as shown in Figures 12-14, a decrease in thermal conductivity weakens the heat transfer effect from the highest temperature to the lower temperature region, meaning that to reach the same temperature, semiconductor heating elements with lower thermal conductivity require less energy to reach their highest temperature region.

[0093] This application provides a heating component 10, as shown in Figures 15-17, including a first electrode 1, a second electrode 2, and a heating element 3 made of the aforementioned semiconductor conductive ceramic; the heating element 3 has an opening 31 for inserting an aerosol generating article 20, and the heating element 3 defines a heating cavity 32 for accommodating the aerosol generating article 20, the opening 31 and the heating cavity 32 are connected; the heating element 3 includes a first end 33 near the opening 31 and a second end 34 away from the first end 33; the first electrode 1 and the second electrode 2 are disposed on the heating element 3 at intervals along the longitudinal direction of the heating element 3, the first electrode 1 and the second electrode 2 are used to guide current in the longitudinal direction of the heating element 3 when the heating component 10 is used, the first electrode 1 is located between the first end 33 and the second electrode 2.

[0094] In one embodiment of this application, the heating element 3 made of semiconductor conductive ceramic is formed by injection molding the semiconductor ceramic raw material into a mold and then sintering and solidifying it. In another embodiment of this application, the preparation process may include: mixing the raw material of conductive ceramic material with a liquid solvent to form an injectable slurry; then injecting the slurry into the cavity of the mold to form a tubular green body; after demolding to obtain the green body, sintering and solidifying it to obtain the heating element 3.

[0095] In one embodiment of this application, the resistivity of the semiconductor conductive ceramic is 0.01 Ω·cm - 1 Ω·cm; and / or the resistivity of the semiconductor conductive ceramic is 0.01 Ω·cm - 0.5 Ω·cm. In another embodiment of this application, the resistivity of the semiconductor conductive ceramic is 0.01 Ω·cm, 0.1 Ω·cm, 0.15 Ω·cm, 0.18 Ω·cm, 0.2 Ω·cm, 0.3 Ω·cm, 0.4 Ω·cm, or 0.5 Ω·cm.

[0096] In one embodiment of this application, when current is guided to the heating element 3 through the first electrode 1 and the second electrode 2, the resistance value of the heating element 3 measured by the first electrode 1 and the second electrode 2 is between 0.45Ω and 5Ω. In other words, when current is guided to the heating element 3 through the first electrode 1 and the second electrode 2, the resistance value of the heating element 3 measured by the first electrode 1 and the second electrode 2 is in the range of 0.45Ω to 5Ω. In some embodiments, the resistance value of the heating element 3 measured by the first electrode 1 and the second electrode 2 is between 0.8Ω and 1.5Ω. In other words, the resistance value of the heating element 3 measured by the first electrode 1 and the second electrode 2 is in the range of 0.8Ω to 1.5Ω. In a specific embodiment, the resistance value of the heating element 3 measured by the first electrode 1 and the second electrode 2 is approximately 1.4Ω.

[0097] In one embodiment of this application, the temperature coefficient of resistance of the semiconductor conductive ceramic is -3000ppm / ℃ to 1000ppm / ℃; and / or the temperature coefficient of resistance of the semiconductor conductive ceramic is -2800ppm / ℃ to 0ppm / ℃. In one embodiment of this application, the resistance of the heating element 3 decreases as the temperature of the heating element 3 increases. In one embodiment of this application, when current is guided through the first electrode 1 and the second electrode 2 on the heating element 3 at room temperature, the initial resistance of the heating element 3 is 1.4Ω; when the temperature of the heating element 3 rises to approximately 350℃, the resistance of the heating element 3 decreases to approximately 0.5Ω.

[0098] In one embodiment of this application, the three-point bending strength of the semiconductor conductive ceramic is greater than or equal to 25 N. In another embodiment, the three-point bending strength of the semiconductor conductive ceramic is greater than or equal to 40 N. In yet another embodiment, the three-point bending strength of the semiconductor conductive ceramic is 25 N, 30 N, 32 N, 35 N, 40 N, 45 N, or 60 N. The three-point bending strength test is a commonly used method for testing the mechanical properties of materials. Its basic principle is to place the sample at two support points and one bending point, and then apply a downward load at the bending point. When the moments formed by the sample at the two support points are equal, the sample will fracture at the midpoint. This method is often used to measure the bending strength (flexural strength) of materials and is suitable for testing the mechanical properties of various materials.

[0099] In one embodiment of this application, the normal total emissivity of the semiconductor conductive ceramic is 0.8-0.96. In another embodiment, the semiconductor conductive ceramic itself has infrared emission characteristics and can emit infrared light to heat the aerosol generation product. In another embodiment, the heating element 3 made of the semiconductor conductive ceramic can be in direct contact with the aerosol generation product.

[0100] In one embodiment of this application, the wall thickness of the heating element 3 is 0.5 mm - 0.7 mm. In another embodiment of this application, the wall thickness of the heating element 3 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, or 0.7 mm.

[0101] In one embodiment of this application, the inner diameter of the heating element 3 is determined based on the diameter of the aerosol-generating article. In one embodiment of this application, the diameter of the aerosol-generating article can be between approximately 5 mm and 12 mm. In another embodiment of this application, the diameter of the aerosol-generating article can be between approximately 6 mm and 10 mm.

[0102] In one embodiment of this application, a first electrode 1 and a second electrode 2 are disposed at a distance from each other on the heating body 3 along its longitudinal direction. The first electrode 1 and the second electrode 2 extend circumferentially along the heating body 3. The first electrode 1 and the second electrode 2 are used to guide current in the longitudinal direction of the heating body 3 when the heating component 10 is in use. The first electrode 1 is located between the first end 33 and the second electrode 2, and the distance between the second electrode 2 and the first end 33 is less than the distance between the second electrode 2 and the second end 34. In another embodiment of this application, the first electrode 1 and the second electrode 2 may be arranged close to the first end 33 but far away from the second end 34.

[0103] In one embodiment of this application, a first distance d1 is provided between the first electrode 1 and the first end 33. A second distance d2 is provided between the first electrode 1 and the second electrode 2. A third distance d3 is provided between the second electrode 2 and the second end 34. In one embodiment of this application, the first distance d1 is smaller than the third distance 33 between the second electrode 2 and the second end 34. In another embodiment of this application, the first distance d1 is less than or equal to the second distance d2. The second distance d2 is less than or equal to the third distance d3.

[0104] In one embodiment of this application, the first spacing d1 is between 0.5 and 2.0 mm. The second spacing d2 is between 1 mm and 4 mm. In some alternative embodiments, the first spacing d1 is approximately 1 mm. The second spacing d2 is approximately 2 mm. Or in some embodiments, the ratio of the second spacing d2 to the longitudinal length of the heating element 3 is between 5% and 50%. In one embodiment of this application, the ratio of the second spacing d2 to the longitudinal length of the heating element 3 is between 5% and 40%.

[0105] In one embodiment of this application, the ratio of the third distance d3 between the second electrode 2 and the second end 34 to the longitudinal length of the heating element 3 is between 0% and 85%. In another embodiment of this application, the ratio of the third distance d33 to the longitudinal length of the heating element 3 is between 40% and 80%.

[0106] In one embodiment of this application, the dimensions of the first electrode 1 and / or the second electrode 2 along the longitudinal direction of the heating body 3 are between 1 mm and 4 mm. In another embodiment, the dimensions of the first electrode 1 and / or the second electrode 2 along the longitudinal direction of the heating body 3 are approximately 2 mm. In some optional embodiments, the ratio of the dimension of the first electrode 1 and / or the second electrode 2 along the longitudinal direction of the heating body 3 to the longitudinal length of the heating body 3 is between 1% and 40%. In one embodiment, the ratio of the dimension of the first electrode 1 and / or the second electrode 2 along the longitudinal direction of the heating body 3 to the longitudinal length of the heating body 3 is between 5% and 40%. In another embodiment, the ratio of the dimension of the first electrode 1 and / or the second electrode 2 along the longitudinal direction of the heating body 3 to the longitudinal length of the heating body 3 is between 10% and 30%.

[0107] In one embodiment of this application, the first electrode 1 and the second electrode 2 are attached to the outer surface of the heating element 3 and are arranged at intervals along the longitudinal direction of the heating element 3.

[0108] In one embodiment of this application, the first electrode 1 and / or the second electrode 2 are arranged extending circumferentially along the heating body 3. The first electrode 1 and / or the second electrode 2 are annular around the heating body 3. In one embodiment of this application, the first electrode 1 and / or the second electrode 2 are closed circumferentially. In one embodiment of this application, the first electrode 1 and / or the second electrode 2 are closed annular rings.

[0109] In one embodiment of this application, the first electrode 1 and / or the second electrode 2 includes 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 1 and / or the second electrode 2 are made of a low-resistivity metal or alloy. For example, the first electrode 1 and / or the second electrode 2 includes gold, silver, copper, or an alloy containing at least one of these. In some embodiments, the first electrode 1 and / or the second electrode 2 are obtained by forming a conductive paste containing the aforementioned low-resistivity metal or alloy on the outer surface of the heating element 3 by printing, spraying, or depositing, and then curing it. For example, the first electrode 1 and / or the second electrode 2 are obtained by printing conductive silver paste on the outer surface of the heating element 3 and then curing it.

[0110] In one embodiment of this application, the heating element 3 includes a first portion 35 and a second portion 36, the first portion 35 being close to or defining a first end 33, and the second portion 36 being close to or defining a second end 34; a first electrode 1 and / or a second electrode 2 are disposed on the first portion 35 and away from the second portion 36.

[0111] In one embodiment of this application, when the heating element 3 is powered through the first electrode 1 and the second electrode 2, the first part 35 of the heating element 3 generates heat through resistive Joule heating, while the second part 36 does not generate heat itself, but generates heat by receiving heat transferred from the first part 35.

[0112] In one embodiment of this application, the first electrode 1 and / or the second electrode 2 are arranged to extend circumferentially along the heating body 3. In this embodiment, the first electrode 1 and / or the second electrode 2 are not closed circumferentially along the heating body 3, and the corresponding electrodes have notches. In other words, at least one of the first electrode 1 and the second electrode 2 is not closed circumferentially, and the corresponding electrode has a notch.

[0113] In one embodiment of this application, the first electrode 1 and / or the second electrode 2 are arcuate shapes extending circumferentially along the heating body 3. At least a portion of the first electrode 1 and at least a portion of the second electrode 2 are opposite each other in the longitudinal direction of the heating body 3; or, in the longitudinal direction of the heating body 3, the first electrode 1 and the second electrode 2 are not completely staggered. In one embodiment of this application, the first electrode 1 and the second electrode 2 have the same arcuate extension along the circumferential direction of the heating body 3; or in some alternative embodiments, the first electrode 1 and the second electrode 2 have different arcuate extensions along the circumferential direction of the heating body 3. For example, the arcuate extension of the first electrode 1 along the circumferential direction of the heating body 3 is less than the arcuate extension of the second electrode 2 along the circumferential direction of the heating body 3. In one embodiment of this application, the arcuate extension of the first electrode 1 and / or the second electrode 2 along the circumferential direction of the heating body 3 is between π and 2π. In one embodiment of this application, the arcuate extension of the first electrode 1 and / or the second electrode 2 along the circumferential direction of the heating body 3 is between 1.5π and 2π.

[0114] In one embodiment of this application, the first electrode 1 defines a first notch 11; the second electrode 2 defines a second notch 21. In this embodiment, the first notch 11 and the second notch 21 are completely offset in the longitudinal direction of the heating element 3. Alternatively, in some other embodiments, the first notch 11 and the second notch 21 are partially offset in the longitudinal direction of the heating element 3. Or, in some other optional embodiments, the first notch 11 and the second notch 21 are arranged opposite to each other in the radial direction of the heating element 3.

[0115] In one embodiment of this application, the circumferential extension arc of the first notch 11 and the circumferential extension arc of the second notch 21 in the heating body 3 are the same. Alternatively, in some embodiments, the circumferential extension arcs of the first notch 11 and the second notch 21 in the heating body 3 are different; for example, in some embodiments, the extension arc of the first notch 11 is greater than the extension arc of the second notch 21. In some embodiments, the extension arcs of the first notch 11 and / or the second notch 21 are approximately between 0.1π and 0.8π. In one embodiment of this application, the extension arcs of the first notch 11 and / or the second notch 21 are approximately between 0.3π and 0.5π.

[0116] In one embodiment of this application, a transition bonding layer is provided between the first electrode 1 and / or the second electrode 2 and the heating element 3. In this embodiment, the transition bonding layer connects the first electrode 1 and / or the second electrode 2 made of metal to the heating element 3 made of ceramic, thereby forming a solid solution or intermetallic compound with the first electrode 1 and / or the second electrode 2 made of metal. The transition bonding layer and the heating element 3 made of ceramic generate strong chemical bonds (ionic bonds / covalent bonds) to achieve the connection of dissimilar materials and achieve the bonding effect. The transition bonding layer enables the first electrode 1 and / or the second electrode 2 and the heating element 3 to form a tight bond.

[0117] In one embodiment of this application, the thickness of the transition adhesive layer is approximately 0.01 mm to 1.0 mm. In another embodiment of this application, the thickness of the transition adhesive layer is approximately 0.05 mm to 0.8 mm.

[0118] In one embodiment of this application, the coefficient of thermal expansion of the transition adhesive layer is less than that of the first electrode 1 and / or the second electrode 2. This is advantageous for suppressing deformation of the first electrode 1 and / or the second electrode 2 during use.

[0119] In one embodiment of this application, the transition adhesive layer is conductive. In another embodiment of this application, the material of the transition adhesive layer may be a metal or alloy, such as silver, aluminum, titanium, or alloys thereof.

[0120] In one embodiment of this application, the transition adhesive layer may be a composite material of ceramics and metals. This allows the transition adhesive layer to simultaneously possess material compatibility with both the metallic first electrode 1 and / or the second electrode 2, and the ceramic heating element 3. For example, in some optional embodiments, the transition adhesive layer may comprise 10%-80% metal and 20%-90% ceramics. The metal in the transition adhesive layer may include at least one of gold, silver, copper, aluminum, nickel, titanium, zirconium, platinum, etc. The ceramic in the transition adhesive layer may include oxides or nitrides such as alumina, zirconium oxide, titanium oxide, iron oxide, and silicon oxide.

[0121] In one embodiment of this application, the transition adhesive layer is obtained by printing or coating the above materials onto the outer surface of the heating body 3 and then sintering it.

[0122] One embodiment of this application also provides a heating assembly 10, as shown in FIG18. A first electrode 1 and a second electrode 2 are arranged at intervals on a heating body 3 for guiding current on at least a portion of the heating body 3; at least one conductive trace 4 is formed or incorporated on the heating body 3; the at least one conductive trace 4 is arranged to extend from the first electrode 1 to the second electrode 2 and is capable of applying a voltage from the first electrode 1 and the second electrode 2 to generate resistive Joule heating.

[0123] One embodiment of the present application also provides an aerosol generating device 100, as shown in FIG. 19, which includes the battery assembly 20 and the heating assembly 10 described above, and the battery assembly 20 provides electric energy to the heating assembly 10.

[0124] 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, and further, those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the claims of the present application.

Claims

1. A heating body, characterized by, The heating body is a semi-conductive ceramic piece, and the semi-conductive ceramic has a thermal conductivity of 5 W / (m·K) to 45 W / (m·K).

2. The heating element according to claim 1, characterized in that The semi-conductive ceramic has a thermal conductivity of 6 W / (m·K) to 30 W / (m·K).

3. The heating element according to claim 1, wherein The semi-conductive ceramic has a resistivity of 0.01 Ω·cm to 1 Ω·cm; and / or the semi-conductive ceramic has a resistivity of 0.01 Ω·cm to 0.5 Ω·cm.

4. The heating element according to claim 1, wherein The semi-conductive ceramic has a temperature coefficient of resistance of -3000 ppm / ℃ to 1000 ppm / ℃; and / or the semi-conductive ceramic has a temperature coefficient of resistance of -2800 ppm / ℃ to 0 ppm / ℃.

5. The heating element according to claim 1, wherein The semi-conductive ceramic has a normal total emissivity of 0.8 to 0.

96.

6. The heating element according to claim 1, wherein The semi-conductive ceramic has a three-point bending strength of greater than or equal to 25 N; and / or the semi-conductive ceramic has a three-point bending strength of greater than or equal to 40 N.

7. A heat generating component, characterized by The heating body comprises a first electrode, a second electrode, and a semi-conductive ceramic heating body as claimed in any one of claims 1 to 6. The heating body has an opening for insertion of an aerosol-generating article, and defines a heating cavity for accommodating the aerosol-generating article, the opening and the heating cavity being in communication; the heating body comprises a first end proximate to the opening, and a second end distal from the first end; The first electrode and the second electrode are spaced apart along the longitudinal direction of the heating body and are arranged on the heating body, and the first electrode and the second electrode are used to guide an electric current in the longitudinal direction of the heating body when the heating assembly is in use, and the first electrode is located between the first end and the second electrode.

8. The heat generating component of claim 7, wherein, The heating body has a wall thickness of 0.5 mm to 0.7 mm.

9. The heat generating component of claim 7, wherein, The first electrode and the second electrode extend along the circumferential direction of the heating body. The second electrode is closer to the first end than to the second end.

10. The heat generating component of claim 9, wherein, The first electrode and / or the second electrode is a closed ring.

11. The heat generating component of claim 9, wherein, The first electrode and / or the second electrode is configured to be non-closed in the circumferential direction, and a notch is provided on the corresponding electrode.

12. The heat generating component of claim 11, wherein, The first electrode and the second electrode each have a notch, the notch on the first electrode is a first notch, and the notch on the second electrode is a second notch, the first notch and the second notch are arranged staggered in the longitudinal direction of the heating body.

13. The heat generating component of claim 11, wherein, The notch extends along an arc of 0.1π to 0.8π in the circumferential direction of the heating body.

14. The heat generating component of claim 9, wherein, The first electrode and / or the second electrode extends along an arc of π to 2π in the circumferential direction of the heating body.

15. The heat generating component of claim 9, wherein, The first electrode and the second electrode extend along the same arc in the circumferential direction of the heating body. Alternatively, the first electrode and the second electrode extend along different arcs in the circumferential direction of the heating body.

16. The heat generating component of claim 9, wherein, Further comprising: A conductive transition bonding layer formed or arranged between the first electrode and / or the second electrode and the heating body for providing bonding between the first electrode and / or the second electrode and the heating body.

17. The heat generating component of claim 9, wherein, The first electrode has a first spacing from the first end, the first electrode has a second spacing from the second electrode, and the second electrode has a third spacing from the second end; the second spacing is greater than or equal to the first spacing, and the second spacing is less than or equal to the third spacing.

18. The heat generating component of claim 9, wherein, The heating element includes: a first portion defining the first end; a second portion defining the second end, the first electrode and / or the second electrode being disposed on the first portion and away from the second portion; when an electric current is directed through the first electrode and the second electrode on the heating element, the first portion is capable of generating heat by resistive Joule heating, and the second portion is capable of generating heat by receiving heat transferred from the first portion.

19. The heat generating component of claim 7, wherein, The first electrode and the second electrode are spaced apart on the heating element for directing an electric current on at least a portion of the heating element; at least one electrically conductive track formed on or integrated with the heating element; The at least one electrically conductive track is arranged to extend from the first electrode to the second electrode and is capable of having a voltage applied by the first electrode and the second electrode to generate resistive Joule heat.

20. An aerosol-generating device comprising: A battery assembly and the heating element as claimed in claims 7-19, the battery assembly providing electrical energy to the heating element.

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