CN216568370U - Heating element for aerosol generating device and aerosol generating device - Google Patents
Heating element for aerosol generating device and aerosol generating device Download PDFInfo
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- CN216568370U CN216568370U CN202122474380.0U CN202122474380U CN216568370U CN 216568370 U CN216568370 U CN 216568370U CN 202122474380 U CN202122474380 U CN 202122474380U CN 216568370 U CN216568370 U CN 216568370U
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Abstract
The application relates to a heating element and aerosol generating device of aerosol generating device, the heating element includes: the conductive ceramic substrate is characterized in that a thin film layer is arranged on part of the surface of the conductive ceramic substrate, the coverage length of the thin film layer is 30% -50% of the total length of the conductive ceramic substrate, and the resistivity of the thin film layer is smaller than that of the conductive ceramic substrate; and the metal electrode is electrically connected with the conductive ceramic matrix or the thin film layer. The application provides a heating body and aerosol generating device of aerosol generating device, through the surface at conductive ceramic base member form the thin layer, utilize the low resistivity of thin layer, can effectively reduce the resistance of conductive ceramic base member bottom, reduce the regional calorific capacity in bottom of heating body, reduce the calorific capacity of whole aerosol generating device.
Description
Technical Field
The application relates to the technical field of ceramics, in particular to a heating body of an aerosol generating device and the aerosol generating device.
Background
At present, with the rapid development of a heating non-combustible aerosol generating device, a heating body of the aerosol generating device becomes a core component, and the overall design and performance quality level of the aerosol generating device are determined. The heating body made of ceramic material has the advantages of oxidation resistance, high temperature resistance, long service life and the like, and has gradually replaced the old heating resistance wire. At present, the theory of operation of conductive ceramic heat-generating body lets in the electric current in its inside, make conductive ceramic wholly generate heat through producing joule heat, this kind of heat-generating body has the advantage such as generate heat evenly, high temperature resistant, anti-oxidant, but as the whole heat source that generates heat, the heat of its output is except being used for heating the tobacco tar and makes the flue gas atomizing, the heat-generating body still can produce a large amount of waste heat with the non-tobacco tar contact position of aerosol generating device, the waste heat of production not only can increase battery energy loss, improve the calorific capacity of whole aerosol generating device, still can influence aerosol generating device's use simultaneously and experience.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a heating element of an aerosol generating device and the aerosol generating device, and the resistance at the bottom of a conductive ceramic substrate can be effectively reduced by utilizing the low resistivity of a thin film layer, so that the heat productivity of the bottom area of the heating element is reduced, and the heat productivity of the whole aerosol generating device is reduced.
In a first aspect, the present application provides a heat-generating body of an aerosol-generating device, the heat-generating body including:
the conductive ceramic substrate is characterized in that a thin film layer is arranged on part of the surface of the conductive ceramic substrate, the coverage length of the thin film layer is 30% -50% of the total length of the conductive ceramic substrate, and the resistivity of the thin film layer is smaller than that of the conductive ceramic substrate; and
and the metal electrode is electrically connected with the conductive ceramic matrix or the thin film layer.
In one embodiment, the thin film layer has a thickness of 2 μm or more.
In one embodiment, the thin film layer is selected from at least one of a nickel layer, a silver layer, a platinum layer, a gold layer, and a copper-nickel composite layer.
In one embodiment, the film layer has a cover length of 7mm to 9 mm.
In one embodiment, the thin film layer covers each surface of the bottom of the conductive ceramic base.
In one embodiment, notches are symmetrically arranged on two sides of the connecting portion of the conductive ceramic substrate, and the metal electrode is wound on the connecting portion along the notches.
In one embodiment, the metal electrode is a copper electrode or a silver electrode, and a silver film, a gold film, or a nickel film is formed on a surface of the copper electrode or the silver electrode.
In one embodiment, the electrically conductive ceramic matrix has a resistivity of 1.0 × 10-5Ω·m～1.0×10-3Ω·m。
In one embodiment, the resistivity of the thin film layer is 1.0 × 10 or less-7Ω·m。
In a second aspect, the present application provides an aerosol-generating device including the above-described heat-generating body.
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects at least:
the application provides a heating body of aerosol generating device, through at least partial surface formation thin layer at the conductive ceramic base member, realize the local metallization of conductive ceramic base member, utilize the low resistivity of thin layer, can effectively reduce the resistance of conductive ceramic base member bottom, reduce the regional calorific capacity in bottom of heating body, reduce the calorific capacity of whole aerosol generating device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a heat generating body of an aerosol generating device according to an embodiment of the present application;
FIG. 2 is a schematic view showing the structure of a conductive ceramic base in a heat-generating body provided in an embodiment of the present application;
FIG. 3 is another schematic structural diagram of a heat generating body of an aerosol generating device according to an embodiment of the present application;
FIG. 4a is a schematic structural diagram of a thin film layer on a conductive ceramic substrate according to an embodiment of the present disclosure;
FIG. 4b is another schematic structural view of a thin film layer on a conductive ceramic substrate according to an embodiment of the present disclosure;
FIG. 5a is a schematic view showing a state after heat cycle of a heat-generating body provided in example 1 of the present application;
FIG. 5b is a schematic view showing a state after heat cycle of the heat-generating body provided in comparative example 1 of the present application.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect connections, unless otherwise indicated.
The term "aerosol-generating device" as used herein refers to an aerosol-generating article which is heated to a temperature below its combustion temperature to generate an aerosol, thereby avoiding the generation of noxious, harmful substances as a result of the combustion of the aerosol-generating article.
Fig. 1 is a schematic structural view of a heat generating body of an aerosol generating device according to an embodiment of the present application, and as shown in fig. 1, the heat generating body of the aerosol generating device according to the present application includes: the conductive ceramic base body 1 is provided with a thin film layer 14 on at least part of the surface of the conductive ceramic base body 1, the coverage length of the thin film layer 14 is 30% -50% of the total length of the conductive ceramic base body 1, and the resistivity of the thin film layer 14 is smaller than that of the conductive ceramic base body 1; and the metal electrode 2 is electrically connected with the conductive ceramic substrate 1 or the thin film layer 14.
The application provides a heating body of aerosol generating device, through at least partial surface formation thin layer at the electrically conductive ceramic base member, realize the local metallization of electrically conductive ceramic base member, can effectively reduce the resistance of electrically conductive ceramic base member bottom, reduce the regional calorific capacity in bottom of heating body, reduce the calorific capacity of whole aerosol generating device.
As shown in fig. 2, the conductive ceramic substrate 1 may be a long sheet, and the thickness of the conductive ceramic substrate 1 may be 0.3 to 2mm, specifically, 0.5mm, 0.7mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, or 2mm, and the like, which is not limited herein; the thickness of the conductive ceramic base 1 is preferably 1 mm. In other embodiments, the conductive ceramic substrate 1 may have a cylindrical shape, a prismatic shape, or the like, and is not limited herein.
The resistivity of the conductive ceramic matrix 1 is 1.0X 10-5Ω·m～1.0×10-3Omega. m, specifically 1.0X 10-5Ω·m、1.5×10-5Ω·m、2.0×10-5Ω·m、1.0×10-4Ω·m、1.0×10-3Ω · m, etc., without limitation.
It should be noted that the heating uniformity of the conductive ceramic substrate is good, but the thickness of the conductive ceramic substrate is small, the generated thermal resistance is large, the solder joint is particularly easy to age, and the whole aerosol generating device generates heat due to the fact that the whole conductive ceramic substrate generates heat, which is not beneficial to prolonging the service life.
The conductive ceramic base 1 may be obtained by dry-pressing and sintering a conductive ceramic base material. The conductive ceramic matrix material comprises at least one of silicon carbide, silicon nitride, aluminum oxide, silicon oxide, titanium diboride, zirconium oxide, titanium carbide and titanium diboride. Preferably, the conductive ceramic matrix material is a composite material of silicon carbide and titanium diboride. The conductive ceramic matrix material is a novel material with ionic conduction and electron/hole conduction in the ceramic material, and has the characteristics of oxidation resistance, corrosion resistance, high temperature resistance, long service life and the like. The heating body made of the conductive ceramic matrix material can uniformly release heat in the repeated heating process, avoids local overheating of the non-combustible product, generates pungent tastes such as scorch and the like, and can prolong the service life of the heating body.
The conductive ceramic base 1 includes an insertion portion 11 and a connection portion 12, and the insertion portion 11 and the connection portion 12 are integrally formed. Wherein the insert 11 is for insertion into an aerosol-forming substrate of an aerosol-generating device such that heat from the heat-generating body can cause the aerosol-forming substrate to form an aerosol. In this embodiment, the insertion portion 11 is a V-shaped tip, which facilitates insertion of the heating element into the aerosol-forming substrate. The edges of the insert 11 are sharpened to further facilitate insertion into the aerosol-forming substrate. The connecting portion 12 is used for mounting the heating element in the aerosol generating device shell, and specifically, the bottom of the conductive ceramic substrate 1 is provided with two connecting portions 12 protruding to both sides respectively, so that the heating element is clamped in the mounting cavity of the aerosol generating device shell.
In order to form the conductive loop, the conductive ceramic base 1 is provided with a through groove 13 along the longitudinal direction, and the through groove 13 enables the conductive ceramic base 1 to form the loop in the power-on state. Wherein, the two connecting parts 12 are symmetrically arranged along the through groove 13; the through grooves 13 are also formed by dry pressing of a mold, and insulating materials can be filled in the through grooves 13.
In order to facilitate the connection of the metal electrodes, notches 121 are symmetrically formed on both sides of the connecting portion 12, and the metal electrodes may be wound around the connecting portion 12 along the notches 121. Specifically, the notch 121 may have an arc shape, a rectangular shape, a trapezoidal shape, a fan shape, etc., and is not limited thereto. In the present embodiment, the notch 121 is an arc-shaped notch to avoid abrasion of the metal electrode.
In other embodiments, as shown in fig. 3, the connecting portion 12 may also form a groove or other structure for connecting the metal electrodes. As shown in fig. 3, the connecting portion 12 may also be provided with a recessed groove 122, and the metal electrode 2 may include an electrode sheet 21 and an electrode wire 22, and the electrode sheet 21 is accommodated in the groove 122 and then fixed by welding through the welding paste layer 23. Understandably, the concave groove is formed on the surface of the conductive ceramic substrate, so that the welding area of the electrode and the conductive ceramic can be increased, the welding strength is improved, and the overall stability is improved. The recess 122 may be rectangular, circular or other shapes as long as the electrode tab can be received in the recess.
A thin film layer 14 is formed on at least a part of the surface of the conductive ceramic base 1, and the thin film layer 14 may be a laminate of at least one or more of a nickel layer, a silver layer, a platinum layer, a gold layer, and a copper-nickel composite layer. In other embodiments, the thin film layer 14 may be made of other materials as long as the resistivity of the thin film layer is smaller than that of the conductive ceramic base, and the other materials may be titanium carbide, titanium nitride, or other plating layers as long as the heat generation amount of the region of the conductive ceramic base covered with the thin film layer can be smaller than that of the region not covered with the thin film layer.
The thickness of the thin film layer 14 is 2 μm or more, and the thicker the thin film layer 14 is, the smaller the resistivity of the thin film layer is, that is, the resistance at the bottom of the conductive ceramic base is lowered, which is advantageous for reducing the amount of heat generated in the bottom region of the heating element. However, the thickness of the thin film layer is too large, and the production cost increases. Specifically, when the thin film layer 14 is a nickel layer, the thickness of the thin film layer is 5 μm to 10 μm, and the thickness of the nickel layer may be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, or the like, but may be other values within the above range. When the thin film layer 14 is a silver layer, a platinum layer, a gold layer or a copper-nickel composite layer, the thin film layer is 2 μm to 10 μm.
As shown in fig. 4a or 4b, the coverage length L of the thin film layer 14 is 30% to 50% of the total length of the conductive ceramic substrate 1, and may be 30%, 32%, 34%, 35%, 40%, 45%, 48%, or 50%, and the like, which is not limited herein. The coverage length L is a distance from the bottom to an end of the thin film layer away from the bottom along the extending direction of the conductive ceramic base. Illustratively, the total length of the conductive ceramic base 1 is 20mm, and then the covered length of the thin film layer 14 may be 6mm to 10 mm.
In the present embodiment, the thin film layer 14 has a covering length L of 7mm to 9mm, and the thin film layer 14 covers at least the connecting portions on both sides of the conductive ceramic substrate. The thin film layer 14 may be formed only on the front surface and/or the back surface of the conductive ceramic base 1, or may be formed on the end surface and/or the side surface of the conductive ceramic base 1, and in this embodiment, the thin film layer 14 covers the respective surfaces of the bottom of the conductive ceramic base 1.
The resistivity of the thin film layer 14 is 1.0 x 10 or less-7Omega. m, specifically 1.0X 10-7Ω·m、1.0×10-8Ω·m、1.5×10-8Ω·m、2.0×10-8Ω·m、1.0×10-9Ω · m, etc., without limitation. As long as the resistivity of the thin film layer 14 is smaller than the resistivity of the conductive ceramic base 1, it can be understood that, since the resistivity of the thin film layer is lower, the resistance of the thin film layer is smaller, and the heat generated after the energization is smaller, the temperature at the bottom of the heating body can be prevented from being too high.
In a specific embodiment, a surface of the connection portion 12 is provided with a solder paste layer, and the solder paste layer is selected from at least one of a silver-copper-titanium-containing solder paste layer, a silver-copper-titanium-indium-containing solder paste layer, and a silver-palladium-titanium-containing solder paste layer; and
at least part of the metal electrode 2 is abutted against the surface of the connecting part and is electrically connected with the connecting part through the welding paste layer.
The metal electrode 2 is a copper electrode or a silver electrode, and at least one of a silver film, a gold film or a nickel film is formed on the surface of the copper electrode or the silver electrode. The surface of the copper electrode or the silver electrode is coated with the film, so that the high-temperature oxidation of the electrode can be slowed down, and the service life of the electrode is prolonged. The metal electrode 2 is a wire-like metal electrode, and the length of the metal electrode 2 is 30mm to 40mm, and may be 30mm, 32mm, 33mm, 35mm, 37mm, 38mm, 40mm, or the like.
In this example, the metal electrode 2 was a silver electrode, and the purity of the silver electrode was 99.9%.
In the actual manufacturing process, the linear metal electrode is wound on the connecting portion 12 along the notch. And after winding, coating the welding slurry on the connecting part and covering the metal electrode so as to preliminarily fix the metal electrode and the conductive ceramic substrate, and sintering.
Or, filling welding slurry in the groove, then arranging the electrode plate in the groove, pressing the electrode plate to enable at least part of the welding slurry to overflow to the surface of the electrode plate, and connecting the electrode plate with the electrode wire so as to enable the metal electrode and the conductive ceramic matrix to be preliminarily fixed, and sintering is performed.
In the above scheme, through forming the welding thick liquids layer in the surface or the recess of conductive ceramic base member, utilize the welding thick liquids layer with metal electrode and conductive ceramic base member or thin layer electricity connection, can increase welding area to can improve the welding strength of metal electrode and conductive ceramic base member, improve the stability in use of heat-generating body, in heat-generating body heating process, can avoid metal electrode heating stress to act on and produce not hard up or drop, can the effective control heat-generating body resistance variation in the heating use.
In a second aspect, the present application also provides an aerosol-generating device including the heating element of the aerosol-generating device according to the first aspect. The application provides an aerosol generating device forms the thin layer on conductive ceramic base member, utilizes the low resistivity of thin layer, can effectively reduce the resistance of conductive ceramic base member bottom, reduces the regional calorific capacity in bottom of heat-generating body, reduces whole aerosol generating device's calorific capacity.
The examples of the present application are further illustrated below in various examples. The present embodiments are not limited to the following specific examples. The present invention can be modified and implemented as appropriate within the scope of the main claim.
Example 1
The bottom of the conductive ceramic base body is provided with a nickel film layer, wherein the total length of the conductive ceramic base body is 20mm, the coverage length of the nickel film layer is 7mm, and the thickness of the nickel film layer is 5 mu m.
Example 2
Different from the embodiment 1, the surface of the conductive ceramic substrate is provided with the copper-nickel composite thin film layer, the coverage length of the copper-nickel composite thin film layer is 7mm, and the thickness of the copper-nickel composite thin film layer is 10 μm.
Example 3
Unlike example 1, the surface of the conductive ceramic substrate was provided with a platinum thin film layer having a coverage length of 7mm and a thickness of 8 μm.
Example 4
Unlike example 1, the surface of the conductive ceramic substrate was provided with a silver thin film layer having a coverage length of 10mm and a thickness of 3 μm.
Example 5
Unlike example 1, the surface of the conductive ceramic substrate was provided with a gold thin film layer having a coverage length of 5mm and a silver thin film layer having a thickness of 2 μm.
Comparative example 1
Unlike example 1, the surface of the conductive ceramic base was not formed with the thin film layer.
Comparative example 2
Unlike example 1, a nickel thin film layer having a thickness of 0.5 μm was formed on the surface of the conductive ceramic base.
Comparative example 3
Unlike example 1, the film layer had a cover length of 5 mm.
Test method
The heat-generating bodies obtained in examples 1 to 5 and comparative examples 1 to 3 were subjected to a suction test.
The suction test was: respectively heating the bare chip and the whole machine to 335 ℃ by adopting a 1000 mA.h battery, running for 3 minutes according to a fixed program, then cooling to room temperature, repeating the processes, and recording the suction times, the temperature of the bottom of the heating body and the temperature of the outer surface of the aerosol generating device; the test results are shown in table 1 below:
TABLE 1
FIGS. 5a to 5b are schematic views showing the state after electrode cycles of the heating elements produced in example 1 and comparative example 1; as shown in fig. 5a and 5b, the heat loss of the heating element manufactured in example 1 is reduced by 10% to 20% after circulation, so that the pumping frequency is increased by 10% to 30% under the same volume of tobacco tar, compared with comparative example 1, the temperature of the bottom of the ceramic heating sheet can be reduced by 10 ℃ to 30 ℃ without forming a local thin film layer on the bottom of the heating element, and the temperature of the outer surface of the whole aerosol generating device is reduced by more than 5 ℃. This is because the thin film layer on the bottom of the conductive ceramic base can effectively reduce the resistance of the bottom of the conductive ceramic base and reduce the amount of heat generated in the bottom region of the heating element.
The film layer thickness at the bottom of the conductive ceramic base of comparative example 2 was too thin, and the resistance at the bottom of the conductive ceramic base was significantly increased, which was not favorable for reducing the amount of heat generated at the bottom region of the heating element.
The coverage length of the thin film layer on the bottom of the conductive ceramic base body of comparative example 3 was too short, which was not favorable for reducing the amount of heat generation in the bottom region of the heat generating body.
As can be seen from the test data of examples 1 to 5, by forming a thin film layer on the surface of the conductive ceramic base to achieve local metallization of the conductive ceramic base, the resistance at the bottom of the conductive ceramic base can be effectively reduced, the amount of heat generation in the bottom region of the heating element can be reduced, and the amount of heat generation of the entire aerosol generation device can be reduced.
The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. A heat-generating body of an aerosol-generating device, characterized in that the heat-generating body comprises:
the conductive ceramic substrate is characterized in that a thin film layer is arranged on part of the surface of the conductive ceramic substrate, the coverage length of the thin film layer is 30% -50% of the total length of the conductive ceramic substrate, and the resistivity of the thin film layer is smaller than that of the conductive ceramic substrate; and
and the metal electrode is electrically connected with the conductive ceramic matrix or the thin film layer.
2. A heat-generating body as described in claim 1, characterized in that the thickness of said thin film layer is 2 μm or more.
3. A heat-generating body as described in claim 1, wherein said thin film layer is at least one selected from a nickel layer, a silver layer, a platinum layer, a gold layer, and a copper-nickel composite layer.
4. A heat-generating body as described in claim 1, characterized in that the covering length of the thin film layer is 7mm to 9 mm.
5. A heat-generating body as described in claim 1, wherein said thin film layer covers each surface of the bottom of said conductive ceramic base.
6. A heating unit as defined in claim 1, wherein notches are symmetrically provided on both sides of the connecting portion of the conductive ceramic base, and the metal electrode is wound around the connecting portion along the notches.
7. A heat-generating body as described in claim 1, wherein the metal electrode is a copper electrode or a silver electrode, and a silver film, a gold film or a nickel film is formed on a surface of the copper electrode or the silver electrode.
8. The heating body as claimed in claim 1, wherein the conductive ceramic base has a resistivity of 1.0 x 10-5Ω·m～1.0×10-3Ω·m。
9. A heat-generating body as described in claim 1, characterized in that the resistivity of said thin film layer is 1.0 x 10 or less-7Ω·m。
10. An aerosol-generating device comprising the heat-generating body according to any one of claims 1 to 9.
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