Heating body, preparation method and heating non-combustion aerial fog generating device

Abstract

The invention relates to a heating element, a preparation method and a heating non-combustion aerial fog generating device, the heating element comprises a tubular base material, a resistance layer, a first electrode layer, a second electrode layer and a drainage electrode, the resistance layer is arranged on the inner wall or the outer wall of the tubular base material; the first electrode layer is arranged at one end of the resistive layer, and the second electrode layer is arranged at the other end of the resistive layer; the drainage electrode is connected with the resistance layer and at least partially overlaps with the resistance layer, and gaps exist between the drainage electrode and the first electrode layer and between the drainage electrode and the second electrode layer. According to the heating element, the drainage electrode is arranged on the resistance layer, so that the heating element can generate temperature difference during heating, the situation that the temperature field of the heating element can only be controlled through the material and the heat conduction performance of the material is changed, the target temperature field of the heating element can be obtained easily, and the preparation cost of the heating element can be reduced easily.

Description

Technical Field

[0001] The present application relates to the technical field of aerosol generating devices, and in particular to a heating element, a preparation method and a heat-not-burn aerosol generating device. Background Art

[0002] In the related technology, the core components of Heat Not Burning (HNB) electronic cigarettes include three major components: battery, motherboard and heating element.

[0003] In the heating element with circumferential heating of the resistor coating, there is an uneven temperature field distribution due to the thermal efficiency and thermal conductivity limitations of the resistor layer, which affects the smoking experience, especially the experience of the first two puffs. Although, by improving the thermal conductivity of the resistor layer or adding a layer specifically for heat conduction to the device, the temperature field can be made uniform. However, an overly uniform temperature field can easily cause the cigarette to be over-baked in the early stage, which will bring a bad experience to the smoker in the last few puffs. Summary of the invention

[0004] In view of this, the present application provides a heating element, a preparation method and a heat not burning (Heat Not Burning, HNB) aerosol generating device, aiming to solve the problem of how to control the temperature field distribution of the heating element to optimize the heating effect, thereby facilitating obtaining the target temperature field to effectively improve the smoking experience.

[0005] The heating element of one embodiment of the present application includes a tubular substrate, a resistor layer, a first electrode layer, a second electrode layer and a drain electrode, wherein:

[0006] The resistance layer is arranged on the inner wall and / or the outer wall of the tubular substrate;

[0007] The first electrode layer is disposed at one end of the resistance layer, and the second electrode layer is disposed at the other end of the resistance layer;

[0008] The drain electrode is connected to the resistance layer and at least partially overlaps with the resistance layer, and there is a gap between the drain electrode and both the first electrode layer and the second electrode layer.

[0009] Furthermore, the resistor layer is made of resistor paste, and the resistor paste includes silver powder, nickel powder, aluminum powder, bonding phase glass powder, aluminum oxide and organic components.

[0010] Furthermore, the specific surface area of ​​the silver powder is less than 1 m2 / g.

[0011] Furthermore, the mass of the silver powder is 30% to 60% of the total mass of the resistor paste, and the total mass of the nickel powder and the aluminum powder is 0 to 40% of the total mass of the resistor paste.

[0012] Furthermore, at least one of the first electrode layer, the second electrode layer and the drain electrode is made of silver.

[0013] Furthermore, the number of the drainage electrode is one, the drainage electrode extends along the circumferential direction of the tubular substrate and is discontinuous in the circumferential direction of the tubular substrate, or the drainage electrode extends along the axial direction of the tubular substrate.

[0014] Furthermore, the number of the drainage electrodes is at least two, and the drainage electrodes are arranged at intervals along the axial direction of the tubular substrate and extend along the circumferential direction of the tubular substrate, wherein each drainage electrode is discontinuous in the circumferential direction of the tubular substrate.

[0015] Furthermore, the tubular substrate is a ceramic substrate or a metal substrate provided with an insulating layer.

[0016] Furthermore, the heating element further comprises a dielectric packaging layer, and the dielectric packaging layer is arranged on a side of the resistance layer away from the tubular substrate.

[0017] Furthermore, the thickness of the resistance layer is greater than 10 μm, and / or the thickness of the first electrode layer is greater than 10 μm, and / or the thickness of the second electrode layer is greater than 10 μm, and / or the thickness of the dielectric packaging layer is greater than 10 μm.

[0018] Another aspect of the present application is a method for preparing a heating element according to an embodiment of the present invention, which is used to prepare the heating element as described above. The method for preparing the heating element comprises:

[0019] Making the resistance layer on the inner wall and / or outer wall of the tubular substrate;

[0020] The first electrode layer and the second electrode layer are spaced apart from each other on the resistance layer;

[0021] The drain electrode electrically connected to the resistance layer is provided, wherein the drain electrode at least partially overlaps with the resistance layer, and there is a gap between the drain electrode and both the first electrode layer and the second electrode layer.

[0022] A heating-without-burning mist generating device according to another embodiment of the present application includes a power supply component and a heating element as described above, wherein the heating element is electrically connected to the power supply component.

[0023] The heating element, preparation method and heating-without-burning aerosol generating device of the embodiment of the present application have at least the following beneficial effects: by setting the drainage electrode in the resistance layer, the heating element can generate a temperature difference when heated. In this way, the temperature field of the heating element when heated can be controlled or adjusted by setting the drainage electrode, which changes the situation that the temperature field of the heating element can only be controlled by the heating element material itself and its material thermal conductivity. Therefore, the temperature field of the heating element when heated can be controlled to a certain extent, which is conducive to obtaining the target temperature field and also helps to reduce the preparation cost of the heating element.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of a structure of a heating element according to an embodiment of the present application;

[0027] Figure 2 for Figure 1 A schematic diagram of the front view structure of the heating element;

[0028] Figure 3 for Figure 2 Schematic cross-sectional view of AA in the figure;

[0029] Figure 4 for Figure 1 A schematic diagram of the structure of the heating element omitting the dielectric packaging layer;

[0030] Figure 5 for Figure 4 A structural diagram from another perspective;

[0031] Figure 6 This is a schematic diagram of a structure of a heating element according to an embodiment of the present application;

[0032] Figure 7 for Figure 6 A schematic front view of the heating element shown;

[0033] Figure 8 for Figure 7 A schematic cross-sectional view of the middle BB;

[0034] Fig. 9 for Figure 6 The schematic diagram of the structure of the heating element shown omitting the dielectric packaging layer;

[0035] Fig.10A schematic diagram of temperature distribution of one embodiment of a heating element according to one aspect of the present application;

[0036] Fig.11 A schematic diagram of temperature distribution of one embodiment of a heating element according to one aspect of the present application;

[0037] Fig.12 A schematic diagram of temperature distribution of one embodiment of a heating element according to one aspect of the present application;

[0038] Fig.13 A schematic diagram of temperature distribution of a heating element according to one embodiment of the present application.

[0039] Reference numerals:

[0040] 110, tubular substrate; 120, first electrode layer; 130, second electrode layer; 140, dielectric packaging layer; 151, first lead; 152, second lead; 160, resistor layer; 170, drain electrode. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0045] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] On the one hand, an embodiment of the present application proposes a heating element, which is applied to a heat not burn (Heat Not Burning, HNB) aerosol generating device, and optimizes the heating effect by controlling the heating element to obtain a target temperature field, so as to effectively improve the smoking experience.

[0047] On the other hand, an embodiment of the present application discloses a heat-not-burn (HNB) aerosol generating device, including a heating element and a power supply component. The heating element is electrically connected to the power supply component. The heating element forms a conductive loop with the power supply component to generate heat, thereby heating the cigarette and generating an aerosol.

[0048] The present application embodiment discloses a heating element, see Figures 1 to 9 The heating element includes a tubular substrate 110, a first electrode layer 120, a second electrode layer 130, a resistor layer 160 and a drain electrode 170, wherein the resistor layer 160 is arranged on the inner wall and / or the outer wall of the tubular substrate 110; the first electrode layer 120 is arranged at one end of the resistor layer 160, and the second electrode layer 130 is arranged at the other end of the resistor layer 160; the drain electrode 170 is connected to the resistor layer 160, and the drain electrode 170 at least partially overlaps with the resistor layer 160, and there is a gap between the drain electrode 170 and the first electrode layer 120 and the second electrode layer 130.

[0049] In the present application, the tubular substrate 110 is a hollow component, that is, the cross section of the tubular substrate 110 is annular. The outer contour of the cross section of the tubular substrate 110 can be circular, elliptical, polygonal or other shapes; similarly, the inner contour of the cross section of the tubular substrate 110 can be circular, elliptical, polygonal or other shapes. Specifically, the tubular substrate 110 can be a circular tubular substrate, an elliptical substrate, a cylindrical substrate, a flat substrate or a substrate of other shapes suitable for heating the shape of a cigarette.

[0050] In the specification and drawings of the present application, only the tubular substrate 110 with a ring-shaped cross-sectional profile is used as a specific embodiment to exemplify and describe the technical solution of the present application in detail, which should not be understood as limiting the specific structure of the tubular substrate 110 of the embodiment of the present application.

[0051] The resistor layer 160 is disposed on the outer wall or inner wall of the tubular substrate 110, the first electrode layer 120 is connected to one end of the resistor layer 160, and the second electrode layer 130 is connected to the other end of the resistor layer 160. When the resistor layer 160 is a discontinuous layered structure disposed circumferentially around the outer wall or inner wall of the tubular substrate 110, the two ends of the resistor layer 160 are the two ends of the resistor layer 160 along the circumferential direction of the tubular substrate 110, such as Figure 4 When the resistor layer 160 extends along the axial direction of the tubular substrate 110, the two ends of the resistor layer 160 refer to the two ends of the resistor layer 160 in the axial direction of the tubular substrate 110 (i.e., the X direction in the figure), as shown in FIG. Fig. 9 shown.

[0052] The drain electrode 170 is not electrically connected to or directly in contact with the first electrode layer 120 and the second electrode layer 130; the drain electrode 170 can be disposed inside the resistor layer 160, or on a side of the resistor layer 160 away from the tubular substrate 110, or between the resistor layer 160 and the tubular substrate 110. Exemplarily, along the radial direction of the tubular substrate 110, the tubular substrate 110, the resistor layer 160, and the drain electrode 170 are stacked in sequence.

[0053] After the drain electrode 170 is arranged on the resistance layer 160, the drain electrode 170 is connected in parallel with the resistance layer 160 at the position corresponding to the drain electrode 170, which can effectively reduce the resistance at the overlapping position of the drain electrode 170 and the resistance layer 160. According to Joule's law, when the resistance decreases, the efficiency of the conductor generating heat also decreases. Therefore, the drain electrode 170 can be arranged at different positions of the resistance layer 160 according to the temperature field requirements of the heated cigarette, so as to achieve the purpose of controlling the temperature field of the heating element.

[0054] It should be understood that the relative position of the drain electrode 170 on the tubular substrate 110 can be set according to the curve change of the target temperature field; the shape, area size and material of the drain electrode 170 can also be set according to the curve change of the target temperature field.

[0055] In the traditional resistor-coated circumferentially heated heating body, due to the thermal efficiency and thermal conductivity limitations of the resistor layer, there is an uneven temperature field distribution phenomenon, which affects the smoking experience, especially the experience of the first two puffs. In addition, by improving the thermal conductivity of the resistor layer or adding a layer specifically used for heat conduction to the device, although the temperature field becomes uniform. However, an overly uniform temperature field can easily cause the cigarette to be over-baked in the early stage, which will bring a bad experience to the smoker in the last few puffs.

[0056] In the heating element and the heat-not-burn aerosol generating device of the present application, by providing the drainage electrode 170 on the resistance layer 160, a temperature difference can be generated when the heating element is heated. The temperature field of the heating element can be controlled or adjusted by providing the drainage electrode 170, which changes the situation that the temperature field of the heating element can only be controlled by the material itself and its thermal conductivity. As a result, the temperature field of the heating element when heated can be controlled to a certain extent, which is conducive to the heating element obtaining the target temperature field when heated, thereby better heating the cigarette to optimize the smoking experience; at the same time, by providing the drainage electrode 170 on the resistance layer 160 to achieve control of the temperature field of the heating element, it is avoided that the heating element must use precious metals to obtain a temperature field that meets the heating of the cigarette, which helps to reduce the preparation cost of the heating element.

[0057] It should be pointed out that the target temperature field described in this application refers to the temperature distribution of the heating element that meets the heating temperature requirements of the cigarette.

[0058] In the present application, by setting the drainage electrode 170, the temperature at different positions of the heating element can be set to be the same or different according to the heating needs of the cigarette, and the temperature at different positions of the heating element can be set within a certain threshold range to meet the heating needs of the cigarette, thereby facilitating a better smoking experience.

[0059] In some embodiments of the present application, the resistor layer 160 is made of a resistor paste, and the resistor paste includes silver powder, nickel powder, aluminum powder, bonding phase glass powder, aluminum oxide and organic components. Among them, the nickel powder can be dispersed in the resistor layer 160 and play a role in preventing the abnormal growth of silver grains. In this way, the service life of the resistor layer 160 can be effectively extended; at the same time, the resistance change of the resistor layer 160 during the high and low temperature transition process is reduced, which is conducive to stabilizing the resistance value of the resistor layer 160. For example, in some embodiments of the present application, in the test of 10,000 high and low temperature transitions from room temperature to 250°C, the resistance change of the resistor layer 160 is less than 1%.

[0060] The organic components described in the present application include but are not limited to organic solvents, resins, dispersants, etc., and the organic solvent may specifically be an ethylene glycol solvent.

[0061] In some of the embodiments, the resistor layer 160 may be formed by sintering a resistor slurry, or the resistor layer 160 may be prepared on the inner wall or outer wall of the tubular substrate 110 by screen printing, spraying, dipping, coating, or other processes.

[0062] In some embodiments of the present application, the specific surface area of ​​the silver powder is less than 1m2 / g. The silver powder with a specific surface area less than 1m2 / g is used so that the resistor paste has a lower sintering activity, which helps to reduce the sintering difficulty, thereby helping to reduce equipment costs and production costs.

[0063] In some embodiments of the present application, the mass of silver powder is 30% to 60% of the total mass of the resistor paste, and the sum of the mass of nickel powder and aluminum powder is 0 to 40% of the total mass of the resistor paste. The addition of nickel powder helps to stabilize the resistor, thereby facilitating better control of the heat generated by the heating element; the addition of aluminum powder helps to stabilize the resistor and reduce costs.

[0064] In practical applications, the mass percentage of silver powder can be set to 35%, 40%, 45%, 50%, 55% and other values ​​according to actual needs; the mass percentage of the total nickel powder and aluminum powder can also be set accordingly according to actual needs. For example, the mass percentage of the total nickel powder and aluminum powder can be set to 10%, 20%, 30% and the like, which is not limited here.

[0065] In some embodiments of the present application, at least one of the first electrode layer 120 , the second electrode layer 130 and the drain electrode 170 is made of silver.

[0066] It is worth noting that the materials of the first electrode layer 120, the second electrode layer 130 and the drain electrode 170 can be the same or different, which is not limited here. One of the first electrode layer 120 and the second electrode layer 130 is a positive electrode, and the other is a negative electrode.

[0067] As one embodiment, the materials of the first electrode layer 120, the second electrode layer 130 and the drain electrode 170 are all silver. The first electrode layer 120 and the second electrode layer 130 are silver, which can reduce the resistance between the first electrode layer 120 and the second electrode layer 130 and the resistor layer 160; the material of the drain electrode 170 is silver, which improves the guiding effect of the drain electrode 170 on the current, so that the temperature field of the heating element can break through the limitations of the material itself and thermal conductivity, which is conducive to obtaining the target temperature field. When the drain electrode 170 is set on the resistor layer 160, the resistor layer 160 at the corresponding position of the drain electrode 170 is connected in parallel with the drain electrode 170, so that the resistance of the overlapping position of the drain electrode 170 and the resistor layer 160 can be effectively reduced. According to Joule's law, when the resistance is reduced, the efficiency of the conductor generating heat is also reduced. Therefore, according to the temperature field requirements of the heated cigarette, the drain electrode 170 can be set at different positions of the resistor layer 160 to achieve the purpose of controlling the temperature field of the heating element.

[0068] In some other embodiments, the first electrode layer 120 and / or the second electrode layer 130 and / or the drain electrode 170 may also be made of other materials with good conductive properties, such as nickel, gold, copper, etc., which are not limited here.

[0069] In some embodiments of the present application, the first electrode layer 120 is connected to a first lead 151, and the second electrode layer 130 is connected to a second lead 152. The heating element is electrically connected to the power supply component through the first lead 151 and the second lead 152 to form a conductive loop.

[0070] In some embodiments of the present application, see Figures 1 to 5 The number of the drain electrode 170 is one, the drain electrode 170 extends along the circumference of the tubular substrate 110 and is discontinuous in the circumference of the tubular substrate 110, or the drain electrode 170 extends along the axial direction of the tubular substrate 110. The axial direction of the tubular substrate 110 refers to the X direction in the figure.

[0071] As one embodiment, the number of the drainage electrode 170 is one, the drainage electrode 170 extends along the axial direction of the tubular substrate 110 , and the drainage electrode 170 is discontinuous in the axial direction of the tubular substrate 110 .

[0072] In some embodiments of the present application, see Figures 6 to 9 The number of the drain electrodes 170 is at least two, and each drain electrode 170 is arranged at intervals along the axial direction of the tubular substrate 110 and extends along the circumferential direction of the tubular substrate 110. Each drain electrode 170 is discontinuous in the circumferential direction of the tubular substrate 110.

[0073] In practical applications, the number of drainage electrodes 170 can be set to 1, 2, 3, 4, etc. according to the actual needs of obtaining the target temperature field.

[0074] In the aforementioned embodiment, the relative position of the drainage electrode 170 in the axial direction of the tubular substrate 110 can be set according to the curve change of the target temperature field; the length of the drainage electrode 170 in the axial direction (i.e., the X direction in the figure) and the length in the circumferential direction of the tubular substrate 110 can also be set according to the curve change of the target temperature field.

[0075] In some embodiments of the present application, the tubular substrate 110 is a ceramic substrate or a metal substrate provided with an insulating layer. When the tubular substrate 110 is a metal substrate, the insulating layer is located between the resistor layer 160 and the metal substrate.

[0076] In some embodiments of the present application, see Figure 2 and Figure 3 , Figure 7 and Figure 8 The heating element further includes a dielectric packaging layer 140, which is disposed on a side of the resistor layer 160 away from the tubular substrate 110. The dielectric packaging layer 140 can protect the resistor layer 160, the first electrode layer 120, the second electrode layer 130 and the drain electrode 170.

[0077] In some embodiments of the present application, the thickness of the resistance layer 160 and / or the first electrode layer 120 and / or the second electrode layer 130 and / or the dielectric packaging layer 140 is greater than 10 μm. In practical applications, the thickness of any one of the resistance layer 160 and / or the first electrode layer 120 and / or the second electrode layer 130 and / or the dielectric packaging layer 140 can be set to 15 μm, 20 μm, 25 μm or 30 μm according to actual needs.

[0078] It should be understood that the thicknesses of any two or more of the resistance layer 160 , the first electrode layer 120 , the second electrode layer 130 and the dielectric packaging layer 140 may be the same or different.

[0079] In some embodiments of the present application, the material of the tubular substrate 110 can be selected as zirconium oxide, aluminum oxide, etc. according to actual needs.

[0080] In some embodiments of the present application, the length of the tubular substrate 110 can be set to values ​​such as 14m, 15mm, 20mm, 25mm, 30mm, etc.

[0081] In some embodiments of the present application, the thickness of the resistance layer 160 may be 15 μm, 20 μm, 25 μm, or 30 μm.

[0082] In some embodiments of the present application, the thickness of the first electrode layer 120 and / or the second electrode layer 130 can be set to a value of 10 μm, 15 μm, 20 μm, etc. Further, the length of the first electrode layer 120 and / or the second electrode layer 130 can be determined according to the length of the resistor layer 160, such as the length of the first electrode layer 120 and / or the second electrode layer 130 is equal to the length of the resistor layer 160. Further, the width of the first electrode layer and / or the second electrode layer can be set according to needs and the arrangement of the resistor layer 160. Exemplarily, when the first electrode layer 120 and the second electrode layer 130 are arranged at both ends of the tubular substrate 110, the length of the first electrode layer 120 and the second electrode layer 130 along the X direction is its width, and its width can be specifically set to a value of 1.5 mm, 2 mm, etc. Similarly, the length of the first electrode layer 120 and / or the second electrode layer 130 can be set according to needs and the arrangement of the resistor layer 160.

[0083] In some embodiments of the present application, the thickness of the drainage electrode 170 can be specifically set to values ​​such as 10 μm, 15 μm, and 20 μm.

[0084] In some embodiments of the present application, when the first electrode layer 120 and the second electrode layer 130 are respectively located at both ends of the tubular substrate 110, the length of the drain electrode 170 in the circumferential direction of the tubular substrate 110 may be 5 mm. It is worth understanding that the length of the drain electrode 170 in the circumferential direction of the tubular substrate 110 may also be set to other values ​​as needed.

[0085] In some embodiments of the present application, when the resistance layer 160 is discontinuous in the circumferential direction of the tubular substrate 110, and the first electrode layer 120 and the second electrode layer 130 are respectively arranged at both ends of the resistance layer 160 in the circumferential direction of the tubular substrate 110, the length of the drain electrode 170 along the axial direction of the tubular substrate 110 can be set to 5 mm, or it can be set to other values ​​as needed. Further, the length of the drain electrode 170 along the circumferential direction of the tubular substrate 110 can be set to 2 mm, or it can be set to other values ​​as needed.

[0086] In some embodiments of the present application, the thickness of the dielectric encapsulation layer 140 can be specifically set to 10 μm, 15 μm, 20 μm, etc. In the present application, by arranging the drain electrode 170 on the resistance layer 160, and by changing the relative position of the drain electrode 170 on the resistance layer 160, or by changing the thickness, material, cross-sectional area size, number of drain electrodes 170 and distribution of multiple drain electrodes 170, different temperature fields of the heating element or, such as Figures 10 to 13 That is to say, the temperature field of the heating element of the present application is controllable. In this way, the heating element of the present application and the heating element of the HNB aerosol generating device can better heat the cigarette to obtain a better smoking experience.

[0087] The method for preparing a heating element proposed in the present application is used to prepare the heating element as described above, wherein the method for preparing the heating element comprises:

[0088] A resistor layer 160 is formed on the inner wall and / or outer wall of the tubular substrate 110;

[0089] The first electrode layer 120 and the second electrode layer 130 are spaced apart on the resistance layer 160;

[0090] A drain electrode 170 electrically connected to the resistance layer 160 is provided, wherein the drain electrode 170 at least partially overlaps with the resistance layer 160 , and there is a gap between the drain electrode 170 and both the first electrode layer 120 and the second electrode layer 130 .

[0091] It should be noted that the order of disposing the drain electrode 170, the first electrode layer 120 and the second electrode layer 130 is not particular, and the process can be adaptively adjusted according to the actual process and structure. For example, the drain electrode 170 can be first disposed on the resistor layer 160, and then the first electrode layer 120 and the second electrode layer 130 can be disposed on the resistor layer 160.

[0092] In some embodiments of the present application, the resistor layer 160 can be disposed on the inner wall and / or outer wall of the tubular substrate 110 by screen printing, spraying, dipping, coating, etc. The resistor layer 160 is made of resistor paste. The resistor paste can specifically include silver powder, nickel powder, aluminum powder, bonding phase glass powder, aluminum oxide, and organic components.

[0093] In some embodiments of the present application, the first electrode layer 120, the second electrode layer 130 and the drain electrode 170 are formed by high-temperature sintering of a conductive paste. Exemplarily, the first electrode layer 120, the second electrode layer 130 and the drain electrode 170 are made of silver, and the first electrode layer 120, the second electrode layer and the drain electrode 170 are formed by high-temperature sintering of a silver paste.

[0094] It is worth understanding that the first electrode layer 120, the second electrode layer 130 and the drain electrode 170 may also be components made of other materials with good conductive properties, such as nickel, gold, etc.; the material and manufacturing process of the drain electrode 170 may be the same as or different from those of the first electrode layer 120 and the second electrode layer 130.

[0095] In some embodiments of the present application, the method for preparing the heating element further includes: manufacturing a dielectric packaging layer 140 on one side of the tubular substrate 110 provided with the resistor layer 160, and using the dielectric packaging layer 140 to package the resistor layer 160, the first electrode layer 120, the second electrode layer 130 and the drain electrode 170. The dielectric packaging layer 140 is provided with windows (i.e., notches) at positions corresponding to the first electrode layer 120 and the second electrode layer 130, so as to facilitate connecting leads to the first electrode layer 120 and the second electrode layer 130, respectively.

[0096] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A heating element, characterized in that: The invention comprises a tubular substrate, a resistor layer, a first electrode layer, a second electrode layer and a drain electrode, wherein: The resistance layer is arranged on the inner wall and / or the outer wall of the tubular substrate; The first electrode layer is disposed at one end of the resistance layer, and the second electrode layer is disposed at the other end of the resistance layer; The drain electrode is connected to the resistance layer and at least partially overlaps with the resistance layer, and there is a gap between the drain electrode and both the first electrode layer and the second electrode layer.

2. The heating element according to claim 1, characterized in that: The resistor layer is made of resistor paste, and the resistor paste includes silver powder, nickel powder, aluminum powder, bonding phase glass powder, aluminum oxide and organic components.

3. The heating element according to claim 2, characterized in that: The specific surface area of ​​the silver powder is less than 1 m2 / g.

4. The heating element according to claim 2, characterized in that: The mass of the silver powder is 30% to 60% of the total mass of the resistor paste, and the total mass of the nickel powder and the aluminum powder is 0% to 40% of the total mass of the resistor paste.

5. The heating element according to claim 1, characterized in that: At least one of the first electrode layer, the second electrode layer and the drain electrode is made of silver.

6. The heating element according to any one of claims 1 to 5, characterized in that: The number of the drainage electrode is one; The drain electrode extends along the circumferential direction of the tubular substrate and is discontinuous in the circumferential direction of the tubular substrate, or the drain electrode extends along the axial direction of the tubular substrate.

7. The heating element according to any one of claims 1 to 5, characterized in that: The number of the drainage electrodes is at least two; The drain electrodes are arranged at intervals along the axial direction of the tubular substrate and extend along the circumferential direction of the tubular substrate, wherein each drain electrode is discontinuous in the circumferential direction of the tubular substrate.

8. The heating element according to claim 1, characterized in that The tubular substrate is a ceramic substrate or a metal substrate provided with an insulating layer.

9. The heating element according to claim 1 or 8, characterized in that: The heating element further comprises a dielectric packaging layer, and the dielectric packaging layer is arranged on a side of the resistance layer away from the tubular substrate.

10. The heating element according to claim 9, characterized in that: The thickness of the resistance layer is greater than 10 μm, and / or the thickness of the first electrode layer is greater than 10 μm, and / or the thickness of the second electrode layer is greater than 10 μm, and / or the thickness of the dielectric packaging layer is greater than 10 μm.

11. A method for preparing a heating element, characterized in that: The method for preparing the heating element is used to prepare the heating element according to any one of claims 1 to 10, and the method for preparing the heating element comprises: Making the resistance layer on the inner wall and / or outer wall of the tubular substrate; The first electrode layer and the second electrode layer are spaced apart from each other on the resistance layer; The drain electrode electrically connected to the resistance layer is provided, wherein the drain electrode at least partially overlaps with the resistance layer, and there is a gap between the drain electrode and both the first electrode layer and the second electrode layer.

12. A heat-not-burn aerosol generating device, characterized in that: It comprises a power supply component and a heating element as described in any one of claims 1 to 10, wherein the heating element is electrically connected to the power supply component.

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