CN220441922U - HNB heating element and aerosol generating device - Google Patents

Abstract

The application discloses HNB heating element and aerosol generating device relates to aerosol generating device technical field, and wherein, HNB heating element includes substrate, resistance layer and electrode layer that generates heat, and resistance layer that generates heat covers in the inner wall and/or the outer wall of substrate, and resistance layer's both ends all are provided with the electrode layer that generates heat, and the electrode layer is connected with resistance layer electricity that generates heat, and the thermal conductivity of resistance layer that generates heat is greater than the thermal conductivity of electrode layer. In the application, the heat conductivity of the resistance heating layer is higher, so that the temperature in the middle of the resistance heating layer is conducted to two ends rapidly, and the temperature of the resistance heating layer is uniformly distributed; the heat conductivity of the electrode layer is smaller than that of the resistance heating layer, which is beneficial to making the temperature of the electrode layer lower than that of the resistance heating layer, the aging rate of devices connected with the electrode layer or surrounding devices can be effectively slowed down, and the service life of the devices is prolonged.

Description

HNB heating element and aerosol generating device

Technical Field

The application relates to the technical field of aerosol generating devices, in particular to an HNB heating element and an aerosol generating device.

Background

The working temperature of the heating non-Burning (HNB) electronic cigarette is about 300 ℃.

The core components of the heating non-burning electronic cigarette comprise three components, namely a battery, a main board, a heating body and the like. The heating non-burning electronic cigarette has higher requirement on the temperature distribution of the heating element, and whether the temperature distribution of the working section of the heating element is uniform directly influences the suction experience of a suction user or not, so that the more uniform the temperature distribution is, the better the suction experience of the suction user is. However, the more uniform the temperature of the working section is, the higher the temperature of the non-working section is, and heat flows to other devices of the aerosol generating device, such as a main board and a battery, through a wire, so that the devices on the main board are easily aged, the service life is reduced, and the smoking set is accelerated to be damaged; meanwhile, the too high temperature of the battery may also bring about a danger. Therefore, the working section of a good e-cigarette heating element needs to have a relatively uniform temperature distribution, while the non-working section at both ends, i.e. the electrode, needs to have a relatively low working temperature.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the HNB heating element can uniformly distribute the temperature of the working section of the heating element and effectively reduce the temperature of the non-working section.

The application also provides an aerosol generating device with the HNB heating element.

According to the HNB heating element of the embodiment of one aspect of the application, the HNB heating element comprises a base material, a resistance heating layer and an electrode layer, wherein the resistance heating layer covers the inner wall and/or the outer wall of the base material, the electrode layers are arranged at the two ends of the resistance heating layer, the electrode layer is electrically connected with the resistance heating layer, and the thermal conductivity of the resistance heating layer is larger than that of the electrode layer.

Further, the thermal conductivity of the resistive heating layer is greater than 30W/(mK).

Further, the thermal conductivity of the resistive heating layer is 100W/(mK).

Further, the thickness of the resistance heating layer is greater than or equal to 10 μm.

Further, the material of the resistance heating layer comprises metal powder, high-heat-conductivity inorganic powder, glass powder and an organic carrier.

Further, the thickness of the resistance heating layer is 50-300 μm.

Further, the thermal conductivity of the electrode layer is less than 40W/(mK).

Further, the thermal conductivity of the electrode layer is less than 30W/(mK).

Further, the thickness of the electrode layer is greater than or equal to 5 μm.

Further, the substrate is sheet-like, needle-like or tubular.

Further, the base material is tubular, the resistance heating layer is arranged on the outer wall of the base material, and the heat conductivity of the base material is larger than that of the resistance heating layer.

Further, the thermal conductivity of the substrate is less than 40W/(mK).

Further, the thermal conductivity of the substrate is less than 30W/(mK).

An aerosol-generating device according to another embodiment of the application comprises an HNB heating element as described above.

The HNB heating element has at least the following beneficial effects: the inner wall and/or the outer wall of the base material are/is provided with a resistance heating layer, and the two ends of the resistance heating layer are provided with electrode layers so that the resistance heating layer forms a conductive loop. The heat conductivity of the resistance heating layer is high, so that the temperature in the middle of the resistance heating layer is quickly conducted to two ends, and the temperature of the resistance heating layer is uniformly distributed; meanwhile, the heat conductivity of the electrode layer is smaller than that of the resistance heating layer, so that the temperature of the electrode layer is lower than that of the resistance heating layer, the ageing rate of devices connected with the electrode layer or surrounding devices can be effectively slowed down, and the service life of the devices is prolonged. It should be appreciated that the resistive heating layer is a working section of the heating element, the temperature of which is evenly distributed, enabling the user to have a good pumping experience; the electrode layer and other parts are non-working sections, and the temperature of the non-working sections is lower than that of the working sections, so that the aerosol generating device can be better protected, and meanwhile, the potential safety hazard is reduced.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The application is further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic view of one of the HNB heating elements according to an embodiment of an aspect of the present application;

fig. 2 is a schematic diagram of one of the HNB heating elements according to an embodiment of an aspect of the present application;

fig. 3 is a schematic view of one of the HNB heating elements according to an embodiment of an aspect of the present application;

fig. 4 is a schematic diagram of one of structures of an HNB heating element according to an embodiment of an aspect of the present application;

fig. 5 is a graph of temperature distribution at various locations along the axial direction of an HNB heating element in one embodiment of the present application;

fig. 6 is a graph of temperature distribution at various locations along the axial direction of an HNB heating element in one embodiment of the present application;

fig. 7 is a graph of temperature distribution at various locations along the axial direction of an HNB heating element in one embodiment of the present application.

Reference numerals:

110. a substrate; 120. a resistive heating layer; 130. an electrode layer.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that references to orientation descriptions, such as directions of up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.

In the description of the present application, a description with reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

An embodiment of an aspect of the present application discloses an aerosol generating device, including casing, HNB heating element and battery pack, HNB heating element sets up in the casing, and HNB heating element is connected with battery pack electricity to form conductive loop, thereby heats.

The application also discloses an HNB heating element, as shown in fig. 1 to 4, this HNB heating element includes substrate 110, resistance heating layer 120 and electrode layer 130, and resistance heating layer 120 covers in the inner wall and/or the outer wall of substrate 110, and resistance heating layer 120's both ends all are provided with electrode layer 130, and electrode layer 130 and resistance heating layer 120 electricity are connected. Wherein the thermal conductivity of the resistive heating layer 120 is greater than the thermal conductivity of the electrode layer 130. Specifically, the thermal conductivity of the resistive heating layer 120 is greater than the thermal conductivity of the substrate 110; the resistivity of the electrode layer 130 is less than the resistivity of the resistive heat generating layer 120; the substrate 110 is insulated from the resistive heat generating layer 120. It is understood that thermal conductivity, also known as thermal conductivity, is a measure of the thermal conductivity of a substance.

In operation, the electrode layer 130 at one end of the resistance heating layer 120 is electrically connected with one electrode of the power supply, and the electrode layer 130 at the other end of the resistance heating layer 120 is electrically connected with the other electrode of the power supply, so that the resistance heating layer 120 can form a conductive loop, thereby heating. It should be noted that, the position of the resistance heating layer 120 is a working section of a heating element, which is used for heating cigarettes and the like; the electrode layer 130 is located at a non-working section of the heating element for electrical connection with the electrodes of the power supply.

In the HNB heating element, the inner wall and/or the outer wall of the substrate 110 is provided with the resistance heating layer 120, and the electrode layers 130 are provided at both ends of the resistance heating layer 120, so that the resistance heating layer 120 forms a conductive loop. The thermal conductivity of the resistance heating layer 120 is higher, so that the temperature in the middle of the resistance heating layer 120 is quickly conducted to two ends, the temperature of the resistance heating layer 120 is uniformly distributed, and a longer uniform temperature section is formed; meanwhile, the heat conductivity of the electrode layer 130 is smaller than that of the resistance heating layer 120, so that the temperature of the electrode layer 130 is lower than that of the resistance heating layer 120, the ageing rate of devices connected with the electrode layer 130 or surrounding devices can be effectively slowed down, and the service life of the devices is prolonged. It should be appreciated that the resistive heat generating layer 120 is the active segment of the heating element, the temperature of which is evenly distributed, enabling a user to have a good pumping experience; the electrode layer 130 and other parts are non-working sections, and the temperature of the non-working sections is lower than that of the working sections, so that the aerosol generating device can be better protected, and meanwhile, the potential safety hazard is reduced.

In some embodiments of the present application, the substrate 110 is tubular, sheet-like, or needle-like.

As one example, the substrate 110 is tubular. For a tubular substrate, the resistance heating layer 120 may be disposed on an inner wall or an outer wall of the substrate 110, and by disposing the electrode layers 130 at two ends of the resistance heating layer 120, the electrode layers 130 are used to form a current loop with a power supply; in addition, the resistance heating layer 120 may be disposed on the inner wall and the outer wall of the substrate 110 at the same time, and the electrode layers 130 are disposed on the inner wall and the outer wall, and the electrode layers 130 on the inner wall and the outer wall are respectively connected with a power source to form a parallel current loop.

As one embodiment, as shown in fig. 1, fig. 1 shows a schematic cross-sectional view of an HNB heating element, in which a substrate 110 is a tubular substrate, and in the drawing, an X direction is a length direction of the substrate 110, and a Y direction is a radial direction, that is, a thickness direction, of the substrate 110. In the illustration, the resistance heating layer 120 is disposed on the outer wall of the substrate 110, and the resistance heating layer 120 has a certain distance from both ends of the substrate 110; along the length direction of the substrate 110, i.e. the X direction, the two ends of the resistance heating layer 120 are provided with electrode layers 130, and the outer wall of the substrate 110, which is not covered by the resistance heating layer 120, is completely covered by the electrode layers 130, and meanwhile, the electrode layers 130 are electrically connected with the resistance heating layer 120, so that the resistance heating layer 120 forms a conductive loop. In this configuration, the cigarettes are placed within the substrate 110. As a preferred embodiment, the thermal conductivity of the substrate 110 is greater than that of the resistive heating layer 120, thereby facilitating an increase in the temperature equalizing effect of the heating element. It should be noted that the higher the thermal conductivity of the substrate 110, the better the soaking effect.

As one of the embodiments, as shown in fig. 2, fig. 2 shows a schematic cross-sectional view of an HNB heating element, the substrate 110 in the heating element is a tubular substrate, in which the X direction is the length direction of the substrate 110 and the Y direction is the radial direction, i.e., the thickness direction, of the substrate 110. Specifically, the substrate 110 is a tubular substrate, the resistance heating layer 120 is disposed on an outer wall of the substrate 110, and the resistance heating layer 120 is spaced from two ends of the substrate 110; along the length direction of the substrate 110, i.e. the X direction, the two ends of the resistance heating layer 120 are both provided with the electrode layer 130, and the outer wall between the end of the electrode layer 130 far away from the resistance heating layer 120 and the end surface of the substrate 110 is exposed, i.e. the outer wall of the substrate 110 at the position is not covered by the electrode layer 130. At this time, the bare substrate 110, the electrode layer 130 and the resistance heating layer 120 are sequentially arranged in a stepwise manner. Further, the thermal conductivity of the substrate 110 is greater than that of the electrode heating layer 120, which is favorable for forming a longer uniform temperature section on the heating element, and is favorable for improving the taste of aerosol generated by heating the cigarettes.

As one embodiment, as shown in fig. 3, fig. 3 shows a schematic cross-sectional view of an HNB heating element, in which the substrate 110 is a tubular substrate, and in which the X direction is the length direction of the substrate 110 and the Y direction is the radial direction, i.e., the thickness direction, of the substrate 110. In the illustration, the resistance heating layer 120 is disposed on the inner wall of the substrate 110, and the resistance heating layer 120 has a certain distance from both ends of the substrate 110; along the length direction of the base material 110, i.e., the X direction, the two ends of the resistance heat layer 120 are provided with electrode layers 130, and the electrode layers 130 completely cover the inner wall of the base material 110 that is not covered by the resistance heat layer 120.

As one embodiment, as shown in fig. 4, fig. 4 shows a schematic cross-sectional view of an HNB heating element, in which the substrate 110 is a tubular substrate, and in which the X direction is the length direction of the substrate 110 and the Y direction is the radial direction, i.e., the thickness direction, of the substrate 110. In the illustration, the resistance heating layer 120 is disposed on the inner wall of the substrate 110, and the resistance heating layer 120 has a certain distance from both ends of the substrate 110; along the length direction of the substrate 110, i.e. the X direction, the two ends of the resistance heating layer 120 are both provided with the electrode layer 130, and the outer wall between the end of the electrode layer 130 far away from the resistance heating layer 120 and the end surface of the substrate 110 is exposed, i.e. the outer wall of the substrate 110 at the position is not covered by the electrode layer 130.

As an example, the substrate 110 is a sheet, and for the sheet substrate 110, the resistive heat-generating layer 120 may be disposed on the upper surface and/or the lower surface of the substrate 110, and the electrode layer 130 is disposed on the surface of the substrate 110, where the electrode layer 130 and the resistive heat-generating layer 120 are disposed on the same surface of the substrate 110. It should be appreciated that when the substrate 110 is sheet-shaped, the inner and outer walls of the substrate 110 correspond to the upper and lower surfaces of the substrate 110, respectively.

As one example, the substrate 110 is needle-shaped. When the substrate 110 is needle-shaped, the resistive heating layer 120 is generally disposed on the outer wall of the substrate 110.

In some embodiments of the present application, the thermal conductivity of the resistive heating layer 120 is greater than 30W/(m·k). By making the thermal conductivity of the resistance heating layer 120 larger than 30W/(m·k), the heat conduction rate of the resistance heating layer 120 is improved, which is advantageous in uniformly distributing the temperature field of the resistance heating layer 120. In practical use, the thermal conductivity of the resistive heating layer 120 may be selected to be 50W (m·k), 70 (m·k), 100W/(m·k), 200W/(m·k), 300W/(m·k), or the like, as required.

As one embodiment, the thermal conductivity of the resistance heating layer 120 is 100W/(m·k), so that the thermal conductivity of the resistance heating layer 120 along the axial direction of the substrate 110 is improved, the temperature uniformity of the resistance heating layer 120 along the axial direction can be increased, and the suction experience of a user is improved. When the thermal conductivity of the resistive heating layer 120 reaches 100W/(m·k), the temperature equalizing section approaches 100%.

It should be noted that, in the working state of the electronic cigarette, the portion of the heating element where the temperature fluctuation is less than 20 c is considered as the soaking zone.

The traditional heating pipe with integral coating has the conditions of uneven heating with high middle temperature and low temperature at two ends when heating. In this embodiment, the thickness of the resistance heating layer 120 is greater than or equal to 10 μm, and meanwhile, since the resistance heating layer 120 also has higher thermal conductivity, the thickness of the resistance heating layer 120 is made thick, so that heat generated in the middle section of the resistance heating layer 120 can be quickly conducted to two ends of the resistance heating layer 120, so as to reduce the heating phenomenon that the middle temperature of the resistance heating layer 120 is high and the temperatures of the two ends are low, thereby increasing the uniformity of the axial temperature of the resistance heating layer 120 and being beneficial to improving the pumping experience of users.

In some embodiments of the present application, the material of the resistive heating layer 120 includes metal powder, high thermal conductive inorganic powder, glass powder, and organic carrier. Specifically, the resistive heating layer 120 is formed by printing a mixture including metal powder, high thermal conductive inorganic powder, glass frit and an organic carrier on the substrate 110, and then sintering the mixture at a high temperature under vacuum. Wherein, the metal powder includes but is not limited to nichrome, nichrome iron, iron chromium aluminum; the high-heat-conductivity inorganic powder can be diamond powder, silicon carbide, aluminum nitride and the like, and has good heat-conductivity; the organic vehicle may be PMMA, PVB, PVA or the like. Therefore, the obtained resistance heating layer 120 has higher resistivity, and the thickness of the resistance heating layer 120 can be made thick so as to increase hot melting and improve the axial heat conduction efficiency of the resistance heating layer 120; meanwhile, the resistance heating layer 120 has a higher heat conductivity coefficient, which is beneficial to increasing the uniformity of the axial temperature of the resistance heating layer 120, thereby improving the pumping experience of a user.

As one embodiment, the thickness of the resistive heat generation layer 120 is 50 to 300 μm. Specifically, the resistance heating layer 120 has a higher resistivity, and the thickness of the resistance heating layer 120 is made thick to increase the thermal melting of the resistance heating layer 120 so as to improve the heat conduction efficiency of the resistance heating layer 120 in the axial direction; meanwhile, the resistance heating layer 120 has a higher heat conductivity coefficient, which is beneficial to increasing the uniformity of the axial temperature of the resistance heating layer 120, thereby improving the pumping experience of a user. In practical applications, the thickness of the resistive heat generating layer 120 may be set to be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 200 μm, 300 μm, etc.

In some embodiments of the present application, the thermal conductivity of the electrode layer 130 is less than 40W/(m·k). Specifically, the thermal conductivity of the electrode layer 130 is smaller than that of the resistive heating layer 120, so that the temperature of the electrode layer 130 is smaller than that of the resistive heating layer 120, which is beneficial to reducing the aging speed of other elements of the aerosol generating device and improving the safety of the aerosol generating device.

As one embodiment, the thermal conductivity of the electrode layer 130 is less than 30W/(m·k).

In some embodiments of the present application, the thickness of the electrode layer 130 is greater than or equal to 5 μm to increase the contact cross section of the electrode layer 130 and the resistive heat generation layer 120, thereby optimizing the conductive effect; in other embodiments, the electrode layer 130 may be partially disposed on the resistive heat-generating layer 120, so that the electrode layer 130 makes good electrical contact with the resistive heat-generating layer 120.

When the thermal conductivity of the base material 110 is higher than 40W/(m·k), the soaking effect of the base material 110 is good, but the base material 110 of this type is either costly, or insufficient in mechanical properties or contains toxic and harmful substances. In some embodiments of the present application, the thermal conductivity of the substrate 110 is less than 40W/(mK) to reduce the temperature of the non-operational section of the substrate 110, thereby reducing the burn-in rate of other devices of the aerosol-generating device, while also improving the safety performance of the aerosol-generating device. It should be noted that the thermal conductivity of the substrate 110 is less than the thermal conductivity of the resistive heat generating layer 120.

As one embodiment, the thermal conductivity of the substrate 110 is less than 30W/(m·k).

In some embodiments of the present application, the substrate 110 is a tubular substrate, and the material of the substrate 110 may be zirconia or quartz. Further, the length of the substrate 110 may be selected to be 27mm, 31mm, 36mm, or the like, as desired. Further, the thermal conductivity of the resistive heating layer 120 may be selected to be 70W/(m·k), 100W/(m·k), or 200W/(m·k) as needed; the length of the resistive heat generating layer 120 along the length of the substrate 110 may be selected according to the actual length of the substrate 110. When determining the length of the resistive heat layer 120, the setting positions of the electrode layers 130 should be reserved at two ends of the resistive heat layer 120. For example, when the length of the substrate 110 is selected to be 31mm, the length of the resistance heat layer 120 may be selected to be 27mm, and the resistance heat layer 120 is disposed in the middle of the substrate 110, so that the electrode layers 130 can be disposed on the substrate 110 corresponding to the two ends of the resistance heat layer 120; when the length of the base material 110 is selected to be 36mm, the length of the resistance heat layer 120 may be selected to be 31mm; when the length of the base material 110 is selected to be 27mm, the length of the resistance heat layer 120 may be selected to be 23mm. The thickness of the resistive heat generating layer 120 may be specifically selected to be 150 μm, 200 μm, 300 μm, 400 μm or the like. Further, the thermal conductivity of the electrode layer 130 may be specifically selected to be 10W/(m·k), 20W/(m·k); the length of the electrode layer 130 may be set according to the distance between the end surface of the resistive heating layer 120 and the end surface of the substrate 110; the thickness of the electrode layer 130 may be specifically selected to be 10 μm, 20 μm, or the like.

In the foregoing embodiment, the temperature uniformity of the working section of the HNB heating element is good, so that the aerosol generating device has better taste, and is beneficial to improving the user suction experience; meanwhile, compared with the temperature of the working section (namely the resistance heating layer 120), the temperature of the electrode layer 130 is lower, and the temperature difference of the electrode layer 130 is large, so that the temperature of the electrode layer 130 at two ends of the substrate 110 is as low as possible, the aging speed of other elements connected with electrode leads in the aerosol generating device can be reduced, the safety of the aerosol generating device is improved, and the service life of the aerosol generating device is prolonged.

In the application, the temperature uniformity of the working section of the HNB heating element is good; meanwhile, the temperature of the electrode layer 130 is lower than that of the working section (i.e., the resistive heat generation layer 120).

For example, referring to fig. 5, fig. 5 shows a temperature distribution situation in an axial direction (i.e., an X direction) of one embodiment of the HNB heating element, and as can be seen from the graph, when the temperature in the middle of the working section of the HNB heating element is 240 ℃, the temperature at both ends of the working section is greater than 225 ℃ and the temperature difference between the working sections is less than 20 ℃ when the HNB heating element is applied to an electronic cigarette; the temperature in the middle of the electrode layer 130 in the non-working sections at both ends is 190 c, the highest temperature is more than 225 c, the lowest temperature is less than 165 c, and the temperature difference in the whole non-working section is more than 60 c, i.e., the temperature of the electrode layer 130 is lower than that in the working section (i.e., the resistive heat generating layer 120).

As another example, referring to fig. 6, fig. 6 shows a temperature distribution in an axial direction (i.e., an X direction) of one embodiment of the HNB heating element, where, as shown in the figure, when the temperature in the middle of the working section of the HNB heating element is 260 ℃, the minimum temperature of the working section is near 250 ℃, and the temperature difference of the working section is less than 15 ℃; the maximum temperature of the non-working section is close to 250 ℃, the minimum temperature is less than 150 ℃, and the temperature difference of the non-working section is more than 100 ℃.

As another example, referring to fig. 7, fig. 7 shows a temperature distribution in an axial direction (i.e., an X direction) of one embodiment of the HNB heating element, where, as shown in the figure, when the temperature in the middle of the working section of the HNB heating element is 305 ℃, the minimum temperature of the working section is greater than 294 ℃ and the temperature difference of the working section is less than 11 ℃; meanwhile, the highest temperature of the non-working section is more than 290 ℃, the lowest temperature is close to 200 ℃, and the temperature difference of the non-working section is more than 90 ℃.

It should be understood that the foregoing embodiments are merely exemplary descriptions and are not to be construed as limiting the HNB heating element of the present application. The embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the present application and features of the embodiments may be combined with each other without conflict.

Claims (13)

1. The HNB heating element is characterized by comprising a base material, a resistance heating layer and an electrode layer, wherein the resistance heating layer is covered on the inner wall and/or the outer wall of the base material, the electrode layers are arranged at the two ends of the resistance heating layer, the electrode layer is electrically connected with the resistance heating layer, and the heat conductivity of the resistance heating layer is larger than that of the electrode layer.

2. The HNB heating element of claim 1, wherein the resistive heating layer has a thermal conductivity greater than 30W/(m-K).

3. The HNB heating element of claim 2, wherein the resistive heat generating layer has a thermal conductivity of 100W/(m-K).

4. A HNB heating element as claimed in any of claims 1 to 3, wherein the thickness of the resistive heat generating layer is greater than or equal to 10 μm.

5. A HNB heating element as claimed in any of claims 1 to 3, wherein the thickness of the resistive heat generating layer is from 50 to 300 μm.

6. The HNB heating element of claim 1, wherein the thermal conductivity of the electrode layer is less than 40W/(m-K).

7. The HNB heating element of claim 6, wherein the thermal conductivity of the electrode layer is less than 30W/(m-K).

8. The HNB heating element of claim 6 or 7, wherein the thickness of the electrode layer is greater than or equal to 5 μm.

9. The HNB heating element of claim 1, wherein the substrate is sheet, needle or tubular.

10. The HNB heating element of claim 9, wherein the substrate is tubular, the resistive heating layer is disposed on an outer wall of the substrate, and the substrate has a thermal conductivity greater than a thermal conductivity of the resistive heating layer.

11. The HNB heating element of claim 1, wherein the substrate has a thermal conductivity of less than 40W/(m-K).

12. The HNB heating element of claim 11, wherein the substrate has a thermal conductivity of less than 30W/(m-K).

13. An aerosol-generating device comprising an HNB heating element as claimed in any of claims 1 to 12.