EP4218439A1

EP4218439A1 - Heating assembly and aerosol forming device

Info

Publication number: EP4218439A1
Application number: EP21870730.5A
Authority: EP
Inventors: Lin Zhang; Shouping Wang; Xingfu Zhang; Keyu XI; Lai SUN; Yan GU
Original assignee: Shenzhen Smoore Technology Ltd
Current assignee: Shenzhen Smoore Technology Ltd
Priority date: 2020-09-23
Filing date: 2021-03-23
Publication date: 2023-08-02
Also published as: JP2023532220A; EP4218439A4; KR20230009985A; WO2022062341A1; CN114246370A

Abstract

A heating assembly and an aerosol forming device. The heating assembly (30) comprises a base plate (31) and a heating body (32), wherein the heating body (32) is embedded in the base plate (31), and the heating body (32) comprises a first extension portion (321) and a second extension portion (322) connected to one end of the first extension portion (321), which are arranged spaced apart from each other; and the base plate (31) and the heating body (32) are used for being at least partially inserted into an aerosol forming substrate and generating heat to heat the aerosol forming substrate when the first extension portion (321) and the second extension portion (322) are powered on. The heating body (32) in the heating assembly (30) can be directly inserted into the aerosol forming substrate, and has a good stability.

Description

TECHNICAL FIELD

The present disclosure relates to the field of heating-not-burning smoke-forming devices, and in particular to a heating assembly and an aerosol-forming device.

BACKGROUND

As an alternative to cigarettes, e-cigarettes are safe, can be conveniently used, healthy, and environmentally friendly. Therefore, the e-cigarettes, such as heating-not-burning e-cigarettes, also known as heating-not-burning aerosol-forming devices, are increasingly popular.
A heating-not-burning aerosol-forming device in the art may heat substances in a tubular peripheral heating manner or in a central embedding heating manner. The tubular peripheral heating manner refers to a heating tube surrounding an outside of an aerosol-forming substance (such as tobacco) to heat the aerosol-forming substance. The central embedding heating manner refers to the heating assembly being inserted into the aerosol-forming substance to heat the aerosol-forming substance. The heating assembly may be easily manufactured and may be used easily, and therefore is widely used. A heating assembly in the art may be manufactured by configuring a ceramic or an insulated metal as a substrate, printing or coating a resistor heating circuit on the substrate, and performing a high temperature treatment to fix the resistor heating circuit on the substrate.
However, the resistor heating circuit on the heating assembly in the art is a thin film printed or coated on the ceramic substrate at a later stage. When the heating assembly is inserted into the aerosol-forming substance for a plurality of times, the substrate may be bent and deformed. Therefore, the resistor heating circuit may easily fall off from the substrate after being heated to a high temperature, and may not be stable. Further, in a heating process, the resistor heating circuit contacts only an aerosol-forming substance, which is disposed on a side of the substrate configured with the resistor heating circuit, but does not contact an aerosol-forming substance, which is disposed on a rear side of the substrate, such that the aerosol-forming substance may not be heated uniformly.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a heating assembly and aerosol-forming device, the heating assembly can solve the problem that the resistive heating line on the existing heating assembly is easy to fall off from the substrate and has poor stability after high-temperature heating.
In order to solve the above technical problems, a technical solution adopted in the present disclosure is to provide a heating assembly. The heat generating assembly includes a substrate; and a heating body, embedded in the substrate and including a first extension portion and a second extension portion connected to an end of the first extension portion; wherein the first extension portion and the second extension portion are spaced; the substrate, the first extension portion, and the second extension portion are configured to be at least partially inserted into an aerosol-forming substance and generate heat to heat the aerosol-forming substance when the first extension portion and the second extension portion are energized.
To solve the above technical problems, another technical solution adopted in the present disclosure is to provide an aerosol-forming device, including a housing, the heating assembly as above, and a power supply assembly; wherein the heating assembly and the power supply assembly are arranged in the housing; the power supply assembly is connected to the heating assembly and is configured to supply power to the heating assembly.
In the heating assembly and the aerosol-forming device provided in the present disclosure, the heating assembly includes the substrate and the heating body to heat the tobacco in the aerosol-forming substance through the heating body after inserted into the aerosol-forming substance; in addition, the heating body includes the first extension portion and the second extension portion connected to the first extension portion, and the substrate, and the first extension portion and the second extension portion of the heating body are configured to be at least partially inserted into the aerosol-forming substance and generate heat to heat the aerosol-forming substance when energized; compared to the existing heating body screen-printed on the ceramic substrate, the substrate and the heating body of the present disclosure can be directly and independently inserted into the aerosol-forming substance, and there is no problem of the heating body falling off from the ceramic substrate and causing failure after high-temperature heating, which greatly improves the stability of the heating assembly; in addition, by arranging the substrate, the heating body is embedded in the substrate to improve the strength, such that the heating assembly may be stressed through the substrate in the process of being inserted into the aerosol-forming substance, thereby effectively avoiding the problem of bending of the heating body due to the stress.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a is a structural schematic view of a heating assembly according to an embodiment of the present disclosure.
FIG. 1b is a structural schematic view of a heating body according to an embodiment of the present disclosure.
FIG. 1c is a plane view of a heating assembly according to an embodiment of the present disclosure.
FIG. 1d is a plane view of a heating assembly according to another embodiment of the present disclosure.
FIG. 1e is a plane view of a heating assembly according to further another embodiment of the present disclosure.
FIG. 2 is a disassembled schematic view of the structure shown in FIG. 1a according to an embodiment of the present disclosure.
FIG. 3a is a disassembled schematic view of the structure shown in FIG. 1a according to another embodiment of the present disclosure.
FIG. 3b is a schematic view of a heating assembly inserted in to an aerosol-forming substance according to an embodiment of the present disclosure.
FIG. 4 is a schematic view of a position between a substrate and a heating body according to an embodiment of the present disclosure.
FIG. 5 is a disassembled schematic view of a heating assembly according to an embodiment of the present disclosure.
FIG. 6 is a disassembled schematic view of a heating assembly according to another embodiment of the present disclosure.
FIG. 7 is a side view of a heating body according to an embodiment of the present disclosure.
FIG. 8 is a schematic view of the size of a heating assembly according to an embodiment of the present disclosure.
FIG. 9 is a C-directional view of the structure shown in FIG. 8.
FIG. 10a is a structural schematic view of a heating assembly according to another embodiment of the present disclosure.
FIG. 10b is a schematic view of a heating assembly inserted in to an aerosol-forming substance according to another embodiment of the present disclosure.
FIG. 11 is a structural schematic view of a heating assembly according to further another embodiment of the present disclosure.
FIG. 12 is a schematic view of the size of a heating assembly according to another embodiment of the present disclosure.
FIG. 13 is a schematic view of a structure where a mounting base is assembled with a heating assembly according to an embodiment of the present disclosure.
FIG. 14 is a disassembled schematic view of the product corresponding to FIG. 13.
FIG. 15 is a schematic view of a structure where a mounting base is assembled with a heating assembly according to another embodiment of the present disclosure.
FIG. 16 is a disassembled schematic view of the product corresponding to FIG. 15.
FIG. 17 is a main view of a structure where a mounting base is assembled with a heating assembly according to an embodiment of the present disclosure.
FIG. 18 is a schematic view of an aerosol-forming device according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Technical solutions in the embodiments of the present disclosure will be clearly and completely described below by referring to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some of but not all of the embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by any ordinary skilled person in the art without creative work shall fall within the scope of the present disclosure.
Terms "first", "second", and "third" in the present disclosure are used for descriptive purposes only, and shall not be interpreted as indicating or implying relative importance or implicitly specifying the number of an indicated technical feature. Therefore, a feature defined by the terms "first", "second", and "third" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality of" means at least two, such as two, three, and so on, unless otherwise expressly and specifically limited. All directional indications (such as up, down, left, right, forward, backward ......) in the present disclosure are used only to explain relative positions and movements of components in a particular attitude (the attitude shown in the corresponding drawing). When the particular attitude is changed, the directional indications may be changed accordingly. Terms "include", "have", and any variation thereof, are intended to cover non-exclusive inclusion. For example, a process, a method, a system, a product or an apparatus including a series of operations or units is not limited to the listed operations or units, but may further include operations or units that are not listed, or may include other may or units that are inherently included in the process, the method, the product or the apparatus.
The term "embodiments" may indicate that a particular feature, a structure or a property described in one embodiment may be included in at least one embodiment of the present disclosure. Presence of the term in various sections in the specification does not necessarily mean a same embodiment or a separate or an alternative embodiment that is mutually exclusive with other embodiments. It shall be understood, both explicitly and implicitly, by any ordinary skilled person in the art that the embodiments described herein may be combined with other embodiments.
The present disclosure will be described in detail below by referring to the accompanying drawings and embodiments.
Referring to FIGS. 1a to 3a, FIG. 1a is a structural schematic view of a heating assembly according to an embodiment of the present disclosure, FIG. 2 is a disassembled schematic view of the structure shown in FIG. 1a according to an embodiment of the present disclosure, and FIG. 3a is a disassembled schematic view of the structure shown in FIG. 1a according to another embodiment of the present disclosure. In the embodiments, a heating assembly 30 is provided, the heating assembly 30 is specifically configured to be inserted into and heat an aerosol-forming substance. For example, in some embodiments, the heating assembly 10 may be specifically configured to be inserted into and heat tobacco, as exemplified in the following embodiments. It is understood that in the embodiments, the aerosol-forming substance may be specifically tobacco.
Specifically, the heating assembly 30 includes a substrate 31 and a heating body 32 embedded in the substrate 31.
Specifically, the substrate 31 may be a rectangular substrate 31, which has a first end M and a second end N opposite to the first end M; when the heating assembly 30 is inserted into the aerosol-forming substance, the second end N of the substrate 31 is inserted into the aerosol-forming substance first. Therefore, in order to facilitate the insertion of the heating assembly 30 into the aerosol-forming substance, the second end N of the substrate 31 may be arranged specifically as a tip, i.e., in a triangular structure, and an angle between two adjacent sides of the tip may be 45 degrees to 90 degrees, for example, 60 degrees.
Specifically, the material of the substrate 31 may be insulating ceramic, and the thermal conductivity of the substrate 31 made of insulating ceramic may be 4-18 W/(m.k), the flexural strength may be above 600 MPa, the thermal stability may exceed 450 degrees, and the fire resistance may be greater than 1450 degrees. Of course, in other embodiments, the substrate 31 may be a metal treated with insulation, for example, a metal substrate arranged with an insulating coating to improve the strength of the heating assembly 30 and prevent the heating assembly 30 from bending or breaking while enabling the heat generated by the heating body 32 to diffuse to the tobacco in contact with the substrate 31, thereby improving the uniformity of heat to the tobacco within the aerosol-forming substance. The material of the substrate 31 may be made of a new composite zirconia material, and the new composite zirconia substrate 31 is capable of insulating and transferring heat generated by the heating body 32 to provide energy utilization of the heating assembly 30. The ceramic substrate 31 may be made of a zirconia toughened alumina ceramic (ZTA) material or mullite and alumina composite (MTA) material.
In some embodiments, the substrate 31 defines a receiving slot 311 along a length direction of the substrate 31, and at least a portion of the heating body 32 is accommodated in the receiving slot 311 to be stressed through the substrate 31 during insertion of the heating assembly 30 into the aerosol-forming substance, thereby avoiding the problem of bending of the heating body 32 due to direct stress.
Specifically, the substrate 31 includes a first surface C₁ and a second surface D₁ back from the first surface C₁, and the receiving slot 311 may be specifically a through slot running through the first surface C₁ and the second surface D₁. The heating body 32 is specifically accommodated in the through slot and upper and lower surfaces of the heating body 32 are flush with the first surface C₁ and the second surface D₁ of the substrate 31, respectively. By setting the receiving slot 311 as a through slot structure, the heating body 32 accommodated in the receiving slot 311 may be exposed from the side with the first surface C₁ and the side with the second surface D₁ of the substrate 31, such that both the surfaces of the heating body 32 may be in direct contact with the tobacco in the aerosol-forming substance after the heating body 32 is inserted into the aerosol-forming substance, which not only has a high energy utilization rate, but also heats more uniformly with a clear boundary of a preset temperature field.
In other embodiments, it is possible to make the upper and lower surfaces of the heating body 32 slightly protrude from the first surface C1 and the second surface D1 of the substrate 31, respectively, or slightly below the first surface C1 and the second surface D1 of the substrate 31, respectively, according to the actual need for temperature field division during heating. In this way, when the upper and lower surfaces of the heating body 32 slightly protrude from the first surface C1 and the second surface C2 of the substrate 31, respectively, the higher temperature of the heating body 32 may be concentrated on the upper and lower surfaces of the heating body 32 and bake the tobacco in contact with the upper and lower surfaces of the heating body 32 at a higher temperature, such that the atomized gas (smoke) may be more intense. While when the upper and lower surfaces of the heating body 32 are slightly lower than the first surface C1 and the second surface C2 of the substrate 31, respectively, due to the barrier effect of the substrate 31, the contact between the upper and lower surfaces of the heating body 32 and tobacco may be more relaxed, which may slightly reduce the baking temperature of the heating body 32 on the tobacco, so as to meet the demand for softer atomized gas.
The heating body 32 may be a self-supporting structure, i.e., the heating body 32 may exist independently without being attached to other carriers. The self-supporting structure of the heating body 32 may effectively avoid the problem of the heating body 32 falling off from the ceramic substrate or metal substrate when the heating body 32 is heated at high temperature or when the substrate is deformed, thereby improving the stability of the heating assembly 30 compared with the existing resistor heating film layer formed by printing or coating on the ceramic substrate. In addition, since the heating body 32 is a self-supporting structure and can be exposed from both the side with the first surface C1 and the side with the second surface D1 of the substrate 31, the heat utilization rate and heating uniformity are effectively improved.
The material of the heating body 32 may be specifically conductive ceramic, compared to the existing metal material, the conductive ceramic material of the heating body 32 has higher conductive efficiency, and the temperature generated by heating is more uniform. In addition, the power of the conductive ceramic heating body 32 may be adjusted and designed between 3-4 watts, conductivity thereof may be up to 1×10 ⁴ ohms-1×10^-6 ohms, suitable for low-voltage start for instant control and design of the power. The bending strength of conductive ceramics may be greater than 40MPa, and the fire resistance may be greater than 1200°C.
Specifically, for the heating body 32 made of conductive ceramics, the material may be selected to be with electromagnetic heating wavelength as a mid-infrared wavelength, which is conducive to atomizing the cigarette oil and enhance the taste. In addition, the crystal phase structure of the conductive ceramic heating body 32 may be high-temperature stable oxide ceramic. Due to the better fatigue resistance, higher strength, and density of oxide ceramics, the problem of harmful heavy metal volatilization and dust may be effectively avoided, thereby greatly improving the service life of the heating body 32.
The above heating body 32, made of ceramics as one piece, may reduce the area of the highest temperature hot spot, eliminating the risk of fatigue cracking and fatigue resistance increase, with better consistency; and due to the high strength of the ceramic heating material and the smoothness of the microcrystalline structure, the surface of the heating body 32 is easier to clean and less likely to adhere; in addition, a ceramic production process for producing the ceramic heating body 32 mainly includes the mixing of raw materials, molding and sintering, and cutting process, and the process is relatively simple and easy to control with lower cost, which is conducive to the promotion of production and economic efficiency.
Specifically, the heating body 32 made of conductive ceramics specifically includes a main component and a crystal component; the main component is configured to conduct electricity and make the conductive ceramic to form a certain resistance, and the main component may be specifically one or more of manganese, strontium, lanthanum, tin, antimony, zinc, bismuth, silicon, titanium; the crystal component, that is, the main material of ceramic materials, is mainly configured to form the shape and structure of the conductive ceramic, and the crystal component may be specifically one or more of lanthanum manganate, lanthanum strontium manganate, tin oxide, zinc oxide, antimony oxide, bismuth oxide, silicon oxide, yttrium oxide. In other embodiments, the heating body 32 may be a ceramic alloy made of a metal alloy or made of an iron-silicon alloy or an iron-silicon aluminum alloy.
Specifically, referring to FIG. 1b, FIG. 1b is a structural schematic view of a heating body according to an embodiment of the present disclosure. In some embodiments, the heating body 32 specifically includes a first extension portion 321 and a second extension portion 322 connected to the first extension portion 321. In specific embodiments, both the first extension portion 321 and the second extension portion 322 are configured to be at least partially inserted into the aerosol-forming substance and generate heat to heat the aerosol-forming substance when energized. It is understood that the first extension portion 321 and the second extension portion 322 may be independently and directly inserted into the aerosol-forming substance, whereas the existing heating bodies screen-printed on ceramic substrates require a ceramic or insulated metal substrate to be inserted into the aerosol-forming substance and cannot be directly inserted into the aerosol-forming device by themselves. The first extension portion 321 and the second extension portion 322 provided by the present disclosure will not have the problem of falling off from the substrate 31 and causing failure when the substrate 31 is deformed or heated up under high temperature, which greatly improves the reliability of the heating assembly 10.
Specifically, a part of the first extension portion 321 and a part of the second extension portion 322 configured to be inserted into the aerosol-forming substance have two opposite surfaces in contact with the aerosol. It is understood that since the heating body 32 of the present disclosure is directly inserted into the aerosol-forming substance, which does not require the aid of the substrate, at least two opposite surfaces of the first extension portion 321 and the second extension portion 322 of the heating body 32 can both directly contact with the aerosol, thereby greatly improving the heat utilization and heating efficiency.
In other embodiments, referring to FIGS. 1a to 3a, the heating body 32 further includes a third extension portion 323 configured to be entirely inserted into and heat the aerosol-forming substance. Specifically, in the embodiments, the first extension portion 321 and the second extension portion 322 are arranged side by side and are spaced apart from each other. An end of the first extension portion 321 near the second extension portion 322 and an end of the second extension portion 322 near the first extension portion 321 are connected with each other through the third extension portion 323. The end of the first extension portion 321 near the second extension portion 322 and the end of the second extension portion 322 near the first extension portion 321 are each specifically an end that is contacted with and inserted into the aerosol-forming substance. It is understood that the first extension portion 321, the second extension portion 322, and the third extension portion 323 are formed into a substantially U-shaped structure; and in specific embodiments, the first extension portion 321, the second extension portion 322, and the third extension portion 323 are one-piece formed and sintered conductive ceramics. Specifically, the heating body 32 substrate 31 may be cut by laser cutting to define a cut-groove 328, thereby obtaining the heating body 32 with the first extension portion 321, the second extension portion 322, and the third extension portion 323. It can be understood that the heat generator 32 may be directly sintered and molded.
In this regard, the shape of each of the first extension portion 321, the second extension portion 322, and the third extension portion 323 is not limited and may be designed according to actual needs. Specifically, the first extension portion 321 and the second extension portion 322 may be each an elongated plate; since the substrate 31 has a tip, the third extension portion 323 may specifically be an arc-shaped plate with an inner circle radius specifically of 0.5 mm and an outer circle radius specifically of 2 mm; the outer circle refers to a position where the third extension portion 323 of the heating body 32 contacts the substrate 31. The advantage of using the arc-shaped plate is that a connection stress with the first extension portion 321 and the second extension portion 322 is low, and the overall structural strength is better.
In the embodiments, the third extension portion 323 may be substantially V-shaped. In other embodiments, the third extension portion 323 may be U-shaped or isosceles trapezoidal, or other shapes where the width gradually decreases from an end near the first extension portion 321 and the second extension portion 322 to the direction away from the first extension portion 321 and the second extension portion 322. In the embodiments, the first extension portion 321, the second extension portion 322, and the third extension portion 323 cooperatively define the cut-groove 328, which may be a rectangle in shape of uniform width, or a convex leading arc is formed at an end of the rectangle near the third extension portion 323. Specifically, the cut-groove 328 is an axisymmetric structure with its length direction parallel to its central axis direction. The first extension portion 321 and the second extension portion 322 are spaced parallel and their length direction is parallel to the central axis direction of the cut-groove 328, and the width direction of the first extension portion 321, the second extension portion 322, and the third extension portion 323 are perpendicular to the central axis direction of the cut-groove 328. The heating body 32 is an axisymmetric structure about the central axis of the cut-groove 328, that is, the first extension portion 321, the second extension portion 322, and the third extension portion 323 are symmetrical about the central axis of the cutting slot 328. Such a structure makes the temperature of the first extension portion 321, the second extension portion 322, and the third extension portion 323 on both sides of the cut-groove 328 at corresponding positions in the width direction of the cut-groove 328 consistent, which makes the smoke taste better.
In other embodiments, referring to FIG. 1c, FIG. 1c is a plane view of a heating assembly according to an embodiment of the present disclosure. The first extension portion 321, the second extension portion 322 are arranged side by side, while the cut-groove 328 may be a centrosymmetric structure with the width gradually decreasing from an end away from the third extension portion 323 to the other end near the third extension portion 323. Correspondingly, outer edges of the first extension portion 321 and the second extension portion 322 are parallel, and the width of each of the first extension portion 321 and the second extension portion 322 gradually increases from an end away from the third extension portion 323 to the other end near the third extension portion 323. The above structure makes the resistance of the end away from the third extension portion 323 slightly increased to balance the resistance with the third extension portion 323 (the resistance of the third extension portion 323 is higher), such that the overall heat generation is more balanced.
In other embodiments, referring to FIG. 1d, FIG. 1d is a plane view of a heating assembly according to another embodiment of the present disclosure. The cut-groove 328 may be a centrosymmetric structure gradually increasing from an end away from the third extension portion 323 to the other end near the third extension portion 323. Correspondingly, outer edges of the first extension portion 321 and the second extension portion 322 are parallel, and the width of each of the first extension portion 321 and the second extension portion 322 gradually decreases from an end away from the third extension portion 323 to the other end near the third extension portion 323, such that the resistance near an upper end of the heating body 32 is greater, in order to apply design requirements of the heating mode in which the high temperature of the heating body 32 is more concentrated in the middle and upper section of the heating body 32.
In other embodiments, referring to Figure 1e, FIG. 1e is a plane view of a heating assembly according to further another embodiment of the present disclosure. The first extension portion 321 and the second extension portion 322 are each rectangular, but not arranged side by side or parallel while at an angle of, for example, 3-10 degrees. In this case, the width of the cut-groove 328 may be a centrosymmetric structure with the width decreasing from an end away from the third extension portion 323 to the other end near the third extension portion 323.
Referring to FIG. 2, the above-mentioned receiving slot 311 has an opened end and a closed end. Specifically, the receiving slot 311 extends from the first end M of the substrate 31 to a position near the second end N. Further, in some embodiments, an end of the receiving slot 311 away from the second end N of the substrate 31 is the opened end, and another end of the receiving slot 311 near the second end N of the substrate 31 is the closed end. By arranging one end of the receiving slot 311 as the opened end, relief of the stress, which is generated while the heating body 32 and the substrate 31 are sintered, may be achieved. For example, when no opening is defined, a small stress of the heating body 32 may compress the substrate 31. In addition, when the first end M is the opened end, the conductive ceramic may be connected to the electrode leads (not shown in the drawings) easily. In the embodiments, the receiving slot 311 may be U-shaped. In the embodiments, the third extension portion 323 of the heating body 32 may be received in the receiving slot 311 and at a position near the closed end. The position of the substrate 31 near the closed end has the tip, allowing the heating body to be inserted into the aerosol-forming substance.
In other embodiments, referring to FIG. 4, FIG. 4 is a schematic view of a position between a substrate and a heating body according to an embodiment of the present disclosure. An end of the through slot away from the second end N of the substrate 31 may be the closed end, while another end of the through slot near the second end N of the substrate 31 is the opened end. In the embodiments, the third extension portion 323 of the heating body 32 may extend out from the opened end of the through slot and form the tip, referring to FIG. 4 for the specific structure. Of course, in other embodiments, both ends of the through slot may be closed ends, i.e., the receiving slot 311 is a through hole.
In detail, referring to FIG. 1a and FIG. 2, the heating body 32 may be plate-shaped. Specifically, the heating body 32 may be the heater plate made of the electrically conductive ceramic. The resistivity of the ceramic used for the heater plate may be 5×10⁵ ohms, the design power of the ceramic may be 2 watts, and the resistance of the ceramic may be 0.71 ohms. Specifically, the heater plate may be a single-strip connection-in-series type, that is, the first extension portion 321, third extension portion 323, and second extension portion 322 are arranged in sequence and are connected in series (the slot is defined in the middle).
In some embodiments, referring to FIG. 5 and FIG. 6, FIG. 5 is a disassembled schematic view of a heating assembly according to an embodiment of the present disclosure, and FIG. 6 is a disassembled schematic view of a heating assembly according to another embodiment of the present disclosure. A bonding layer 34 is disposed at a junction where the substrate 31 is connected to the heating body 32, to strengthen the bonding between the heating body 32 and the substrate 31. Specifically, the bonding layer 34 may be made of an adapted inorganic glass-ceramic, and may be joined to the substrate 31 and the heating body 32 by co-sintering. Specifically, the thickness of the bonding layer 34 may be 0.05 mm to 0.1 mm. Of course, in other embodiments, the substrate 31 and the heating body 32 may be seamlessly-spliced with each other.
In specific embodiments, a periphery of the sintered heating body 32 is coated with bonded glass ceramic. Subsequently, the heating body 32 is placed in the receiving slot 311 of the sintered substrate 31. Further, a second sintering may be performed on the substrate 31 and the heating body 32, such that the heating body 32 is embedded into the receiving slot 311 of the substrate 31.
Referring to FIG. 1a to FIG. 5, in specific embodiments, the heating assembly 30 further includes a first electrode 33a and a second electrode 33b. One of the first electrode 33a and the second electrode 33b is arranged on the first extension portion 321, and the other one of the first electrode 33a and the second electrode 33b is arranged on the second extension portion 322. While the device is in use, the first electrode 33a and the second electrode 33b are electrically connected to the power supply assembly via electrode leads respectively, such that the heating body 32 is electrically connected to the power supply assembly. Specifically, referring to FIG. 3a, the first electrode 33a and the second electrode 33b are arranged on the end of the first extension portion 321 away from the third extension portion 323 and the end of the second extension portion 322 away from the third extension portion 323, respectively; and a surface of the first extension portion 321 where the first electrode 33a is arranged and a surface of the second extension portion 322 where the second electrode 33b is arranged face towards a same direction. In specific embodiments, when the substrate 31 is a metal substrate, the first electrode 33a and the second electrode 33b may extend to the surface of the substrate 31 made of metal. In this way, when power is supplied, the substrate 31 made of metal may generate heat, such that the heating efficiency may be improved.
In specific embodiments, referring to FIGS. 2, 5 and 6, one of the first extension portion 321 and the second extension portion 322 has a first surface C₂ and a second surface D₂ opposite to the first surface C₂, and the first electrode 33a is arranged on each of the first surface C₂ and the second surface D₂. The other one of the first extension portion 321 and the second extension portion 322 has a first surface C₂ and a second surface D₂ opposite to the first surface C₂, and the second electrode 33b is arranged on each of the first surface C₂ and the second surface D₂. That is, the number of first electrodes 33a is two, and the number of second electrodes 33b is two. When the first electrode 33a and the second electrode 33b are connected to two electrode leads, one of the two electrode leads is the Y-shaped electrode lead and is connected to the first electrode 33a arranged on the two surfaces on the first extension portion 321; and the other one of the two electrode leads is the Y-shaped electrode lead and is connected to the second electrode 33b arranged on the two surfaces on the second extension portion 322. By arranging the first electrode 33a and the second electrode 33b on each of the two surfaces, soldering may be performed easily, and the contact area of the heating body 32 made of the conductive ceramic may be increased as much as possible to reduce the contact resistance. In this way, when power is supplied to the heating body 32, a relatively less heat may be generated, the temperature may be reduced. Further, two surfaces of the heating body 32 made of the conductive ceramic may be conducted at the same time, the two surfaces may generate the same electrical potential, such that conductive components of the two surfaces may generate a uniform electric field, and a better heating effect may be achieved. Therefore, the mounting base 40 may be arranged at positions where the first electrode 33a and the second electrode 33b are arranged (the resistance of the heating body32 at the first electrode 33a and the second electrode 33b may be low, and a less amount of heat may be generated). In this way, the mounting base 20 may be prevented from being damaged due to high temperatures.
Specifically, the first electrode 33a and the second electrode 33b may be formed at two ends of the first extension portion 321 and the second extension portion 322 by means of coating to improve the bonding between the electrodes and the heating body 32, thereby improving the stability of the connection between the electrode leads connected to the electrodes and the heating body 32. It is understood that the ceramic has a microporous structure, and the microporous structure of the ceramic may make the bonding between the formed first electrode 33a and the second electrode 33b and the heating body 32 stronger despite the large coating thickness, thereby greatly improving the bonding between the first electrode 33a and the second electrode 33b and the heating body 32. Specifically, the above coating material may be selected from silver paste. It can be understood that the first electrode 33a and the second electrode 33b may be formed by depositing a metal film, such as depositing a metal material with resistivity greater than 1×10^-6 ohm such as gold, platinum, copper, etc.; the length of the coating specifically may be 6.5 mm.
In specific embodiments, referring to FIG. 7, FIG. 7 is a side view of a heating body according to an embodiment of the present disclosure. The surface of the heating body 32 may be coated with a protective layer 35. The protective layer 35 covers the first electrode 33a and the second electrode 33b to prevent oil, which is generated when the tobacco is heated, from damaging the first electrode 33a, the second electrode 33b, and the heating body 32. Specifically, the protective layer 35 may be a vitreous glaze layer. Further, the protective layer 35 may cover the entire substrate 31, such that the entire heating assembly 30 has a smooth surface. Of course, in other embodiments, the protective layer 35 may be coated over the entire surface of the substrate 31 as well as a portion of the surface of the heating body 32 near the substrate 31 such that a portion of the surface of the heating body 32 away from the substrate 31 is exposed, thereby enabling the heating body 32 to come into direct contact with the aerosol-forming substance while improving the smoothness of the surfaces of the substrate 31 and the heating body 32, thus improving heat utilization. The portion of the surface of the heating body 32 near the substrate 31 specifically refers to the surface of a portion of the heating body 32 near a connection of the heating body 32 and the substrate 31; the portion of the surface of the heating body 32 away from the substrate 31 specifically refers to the surface of the middle portion of the heating body 32.
In detail, referring to FIG. 1a, the heating body 32 includes a first heat region A and a second heat region B connected to the first heat region A. The first heat region A is a main atomization region to be inserted into and heat the aerosol-forming substance. In this way, the substrate 31 and at least a portion of the heating body 32 are inserted into the aerosol-forming substance. An atomization temperature on the heating body 32 is concentrated within a range of 280°C to 350°C, and the region in the temperature of 280°C to 350°C occupies more than 75% of an area of the atomization region. The second heat region B is a main mating section of the heating body 32 and has a temperature below 150°C. In specific embodiments, the first electrode 33a and the second electrode 33b are specifically arranged at the second heat region B of the heating body 32 to reduce the atomization temperature of the ceramic heating body 32, allowing the ratio of the temperature of the first heat region A to the temperature of the second heat region B of the heating body 32 to be greater than 2.
In specific embodiments, the resistivity of the material of the portion of the heating body 32 located in the second heat region B is less than the resistivity of the material of the portion of the heating body 32 located in the first heat region A, such that the temperature of the first heat region A of the heating body 32 is greater than the temperature of the second heat region B. In addition, by arranging materials of different resistivities in different heat regions, the temperature of different heat regions is regulated by the difference in resistivities. Specifically, the portion of the heating body 32 located in the first heat region A and the portion of the heating body 32 located in the second heat region B have substantially the same main component of the ceramic material and are integrally formed, but the portion of the heating body 32 located in the first heat region A and the portion of the heating body 32 located in the second heat region B have different proportions of the ceramic material or different other components, such that the resistivity of the portion of the heating body 32 located in the first heat region A is different from that of the portion of the heating body 32 located in the second heat region B. Compared with the related art, the first heat region A and the second heat region B are adopted with different conductive materials, such as aluminum film and gold film, and the solution of splicing the two different conductive material materials can effectively avoid the problem of breaking the conductive body of the first heat region A and the second heat region B of the heating body 32.
According to the present disclosure, the heating assembly 30 is provided. The substrate 31 and the heating body 32 are arranged, such that after the heating body 32 is inserted into the aerosol-forming substance, the heating body 32 heats the tobacco in the aerosol-forming substance. Further, the heating body 32 includes the first extension portion 321 and the second extension portion 322 connected to the first extension portion 321. The substrate 31, the first extension portion 321, and the second extension portion 322 of the heating body 32 are at least partially inserted into the aerosol-forming substance, and generate heat to heat the aerosol-forming substance when being conducted. Compared to the heating body in the art, which is screen-printed on the ceramic substrate, the substrate 31 and the heating body 32 of the present disclosure can be directly and independently inserted into the aerosol-forming substance. Further, when the temperature is excessively high, the heating body 32 may not fall off from the ceramic substrate, failure of the heating assembly 30 may not be caused, the stability of the heating assembly 30 may be improved significantly. In addition, by arranging the substrate 31, the heating body 32 is embedded in the substrate 31 to improve the strength of the heating assembly 30, such that while the heating assembly 30 is being inserted into the aerosol-forming substance, the heating body 32 may not receive the force directly but may receive the force through the substrate 31, such that the heating body 32 may not be bent.
In some embodiments, referring to FIG. 2 and FIG. 3a, a first flange 312 is arranged on an inner wall surface of the through slot near the second surface D₁ of the substrate 31. A size of the first flange 312 in the thickness direction is less than the thickness of the heating body 32. The heating body 32 is specifically lapped on a surface of this first flange 312 away from the second surface D₁ of the substrate 31, such that the heating body 32 may be prevented from falling out of the through slot of the substrate 31. Specifically, the surface of the first flange 312 flushes with the second surface D₁ of the substrate 31 and may be integrally formed with the substrate 31. In the present embodiment, the substrate 31 may be cut by laser to a predetermined size to form the step-shaped substrate 31 having the first flange 312 as described in the above. In this way, dimensional accuracy of the product may be ensured effectively, and a supportive strength of the first flange 312 may be improved significantly.
In some embodiments, referring to FIG. 2, the first flange 312 extends continuously along a circumferential direction of the through slot to be arranged on the entire inner wall surface of the through slot. To be noted that the size of the first flange 312 in the thickness direction is less than the thickness of the heating body 32, which may be interpreted as the first flange 312 being arranged along the circumferential direction of the through slot to allow the first flange 312 having a same shape as the through slot. When the through slot is a U-shaped slot, the first flange 312 is in a continuous U-shaped structure.
In some embodiments, referring to FIG. 1a and FIG. 2, the length of the substrate 31 is slightly greater than the length of the heating body 32, the first heat region A and the second heat region B of the heating body 32 may all be accommodated in the receiving slot 311, and an inner wall surface of the through slot is arranged with the first flange 312 at positions corresponding to the first heat region A and the second heat region B of the heating body 32, and the first heat region A and the second heat region B of the heating body 32 are lapped on the first flange 312. Accordingly, during the process of electrifying and heating the heating body 32, the temperature of the portion of the substrate 31 surrounding the first heat region A is greater than the temperature of the portion of the substrate 31 surrounding the first heat region A. In the structure shown in FIG. 2, the first heat region A and the portion of the substrate 31 surrounding the first heat region A are inserted inside the aerosol-forming substance, and the second heat region B and the portion of the substrate 31 surrounding the second heat region B are positioned outside the aerosol-forming substance.
Specifically, the size of the product corresponding to the above embodiments (shown in FIG. 2) may be seen specifically in FIG. 8 and FIG. 9, where FIG. 8 is a schematic view of the size of a heating assembly according to an embodiment of the present disclosure, and FIG. 9 is a C-directional view of the structure shown in FIG. 8. Specifically, the substrate 31 may have a total length L21 of 15-20 mm, for example, it may be 18.00 mm, a total width W21 of 3-6 mm, for example, it may be 5.00 mm, and a total thickness H21 of 0.3-0.6 mm, for example, it may be 0.5 mm. The width W22 of the first surface C₁ of the substrate 31 may be 0.5-1 mm, such as may be 0.75 mm, and the width W23 of the second surface D₁ of the substrate 31 may be 1-2 mm, such as may be 1.25 mm. In the embodiments, the width of the first flange 312 may be 0.2-0.3 mm, for example, may be 0.25 mm. The length L22 of the heating body 32 arranged in the receiving slot 311 may be 10-17 mm, for example, may be 16.1 mm, and the width W24 may be 2-5 mm, for example, may be 3.4 mm; the length L23 of the first extension portion 321 and the second extension portion 322 may be 12-16 mm, for example, may be 14.55 mm; the spacing L24 between the first extension portion 321 and the second extension portion 322 is less than one-tenth of the entire width of the heating body 32, and the spacing L24 between the first extension portion 321 and the second extension portion 322 may range from 0.25-0.35 mm, for example, the spacing L24 between the two may be 0.3 mm specifically to avoid short circuit problems while effectively ensuring the strength of the heating body 32. Specifically, after the heating body 32 is accommodated in the receiving slot 311, a gap exists between the heating body 32 and the inner wall surface of the housing slot 311 to facilitate the filling of the bonding layer 34, and the width of the gap may be 0.05-0.1 mm.
In other embodiments, referring to FIG. 10a, FIG. 10a is a structural schematic view of a heating assembly according to another embodiment of the present disclosure. For the first heat region A and the second heat region B, the first heat region A of the heating body 32 may be received in the receiving slot 311, and the second heat region B is arranged in suspension. In this case, referring to FIG. 10b, FIG. 10b is a schematic view of a heating assembly inserted in to an aerosol-forming substance according to another embodiment of the present disclosure. The entire substrate 31 may be inserted into the aerosol-forming substance 302, and in this case, the heating body 32 is partially inserted into the aerosol-forming substance 302. Specifically, only the majority or the entire first heat region A of the heating body 32 is inserted into the aerosol-forming substance 302, and the portion corresponding to the second heat region B is disposed out of the aerosol-forming substance 302, i.e., not inserted into the aerosol-forming substance 302. Alternatively, the first heat region A and a small portion of the second heat region B of the heating body 32 are inserted into the aerosol-forming substance 302, and the majority of the portion corresponding to the second heat region B is disposed out of the aerosol-forming substance 302. In the embodiments, referring to FIG. 5 and FIG. 11, FIG. 11 is a structural schematic view of a heating assembly according to further another embodiment of the present disclosure. The portion of the first extension portion 321 disposed in the second heat region B has a first protrusion 3211, and the portion of the second extension portion 322 disposed in the second heat region B has a second protrusion 3221 opposite to the first protrusion 3211, such that the width of the portion of the heating body 32 disposed in the second heat region B is greater than the width of the portion of the heating body 32 disposed in the first heat region A. In this way, the strength of the second heat region B of the heating body32 is ensured. Further, the resistance of the second heat region B is less than the resistance of the first heat region A of the heating body 32, and the temperature corresponding to the second heat region B of the heating body32 is lower. Specifically, in the embodiments, the length L21 of the substrate 31 is less than the length L22 of the heating body 32.
Specifically, the first protrusion 3211 and the second protrusion 3221 abut against the ends of the substrate 31. In a specific embodiment, the receiving slot 311 has two opposite side walls, and the width of each of the two opposite side walls is W26. Each of the width W25 of the first protrusion 3211 and the width W25 of the second protrusion 3221 may be the same as the width W26. The two opposite side walls of the receiving slot 311 refers to two extension portions of the substrate 31 that are spaced apart from each other and are arranged parallel to each other. Further, in an embodiment, referring to FIG. 5, each of the end of the first extension portion 321 away from the third extension portion 323 and the end of the second extension portion 322 away from the third extension portion 323 is arranged with a second flange 313 flushing with the first flange 312. Each of a position of the first protrusion 3211 corresponding to the second flange 313 and a position of the second protrusion 3221 corresponding to the second flange 313 is arranged with a first reserved portion 324. The first reserved portion 324 is lapped on the second flange 313, such that the second heat region B of the heating body 32 may be supported by the second flange 313.
In other embodiments, referring to FIG. 3a, the heating body 32 is accommodated entirely in the receiving slot 311, and the first flange 312 is arranged only on the inner wall surface of the receiving slot 311 near the first end M; specifically, the number of the first flanges 312 is two, and the two first flanges 312 are arranged on the two inner wall surfaces of the receiving slot 311 opposite each other and are disposed on the substrate 31 near the first end M.
Specifically, when the entire heating body 32 is accommodated in the receiving slot 311, the two first flanges 312 are only arranged on the inner wall surface of the receiving slot 311 at positions corresponding the second heat region B of the heating body 32, and the portion of the heating body 32 in the second heat region B is lapped on the two first flanges 312. In this case, referring to FIG. 3b, FIG. 3b is a schematic view of a heating assembly inserted in to an aerosol-forming substance according to an embodiment of the present disclosure. The substrate 31 is partially inserted into the aerosol-forming substance 302, and the heating body 32 is still partially inserted into the aerosol-forming substance 302. Specifically, only the portion of the heating body 32 corresponding to the first heat region A is inserted into the aerosol-forming substance 302, the first heat region A of the heating body 32 does not need to be supported by the substrate 31, and the portion of the heating body 32 corresponding to the second heat region B and a portion of the substrate 31 at a corresponding position rest on the outside of the aerosol-forming substance 302, i.e., not inserted into the aerosol-forming substance 302. In specific embodiments, referring to FIG. 6, the thickness of the heating body 32 is the same as the thickness of the substrate 31, and the portion of the heating body 32 located in the second heat region B is arranged with two second reserved portions 325 facing the two first flanges 312, and the two second reserved portions 325 are lapped on the two first flanges 312.
Of course, in other embodiments, for the first heat region A and the second heat region B, when only the first heat region A of the heating body 32 is received in the receiving slot 311, the two first flanges 312 are arranged only at positions of the inner wall surface of the receiving slot 311 corresponding to the portion of the heating body 32 in the first heat region A, and the portion of the heating body 32 in the first heat region A is lapped on the two first flanges 312.
In specific embodiments, the size of the heating body 32 corresponding to FIG. 3a is shown in FIG. 12, and FIG. 12 is a schematic view of the size of a heating assembly according to another embodiment of the present disclosure. The total length L21 of the substrate 31 may be in a range from 15 mm to 20 mm, such as may be 18.00 mm, the total width W21 of the substrate 31 may be in a range from 3 mm to 6 mm, such as may be 5.00 mm, and the total thickness H21 of the substrate 31 may be in a range from 0.3 mm to 0.6 mm, such as may be 0.5 mm. The width W22 of the first surface C₁ of the substrate 31 may be in a range from 0.5 mm to 1 mm, such as may be 0.75 mm. The width W23 of the second surface D₁ of the substrate 31 may be in a range from 1 mm to 2 mm, such as may be 1.25 mm. In the embodiments, the thickness H22 of the first flange 312 may be in a range from 0.2 mm to 0.3 mm, such as may be 0.25 mm. The length L25 of the first flange 312 may be in a range from 5 mm to 6 mm, such as may be 6.00 mm. The length L22 of the heating body 32 received in the receiving slot 311 may be in a range from 10 mm to 17 mm, such as may be 16.1 mm. The width W24 of the portion lapped on the first flange 312 may be in a range from 2 mm to 5 mm, such as may be 3.4 mm. The width W27 of the portion snapped between the two first flanges 312 may be in a range from 2 mm to 3 mm, such as may be 2.4 mm. Each of the length L23 of the first extension portion 321 and the length L23 of the second extension portion 322 may be in a range from 13 mm to 16 mm, such as may be 14.55 mm. The spacing L4 between the first extension portion 321 and the second extension portion 322 is less than one tenth of the width of the entire heating body 32. The spacing L24 between the first extension portion 321 and the second extension portion 322 may be in a range from 0.25 mm to 0.35 mm, for example, the spacing L24 between the two extension portions may be specifically 0.3 mm. Specifically, the length corresponding to the first reserved portion 324 on the heating body 32 is the same as the length of the first flange 312, the height corresponding to the first reserved portion 324 is the same as the thickness H22 of the first flange 312. Specifically, an error for each of the above dimensions is not greater than 0.05 mm.
In some embodiments, referring to FIGS. 13 to 16, FIG. 13 is a schematic view of a structure where a mounting base is assembled with a heating assembly according to an embodiment of the present disclosure, FIG. 14 is a disassembled schematic view of the product corresponding to FIG. 13, FIG. 15 is a schematic view of a structure where a mounting base is assembled with a heating assembly according to another embodiment of the present disclosure, and FIG. 16 is a disassembled schematic view of the product corresponding to FIG. 15. The heating assembly 30 is further arranged with a mounting base 40. In specific embodiments, the heating assembly 30 is arranged on the mounting base 40 when in use so as to form a heating mechanism. The mounting base 40 is clamped and fixed with the heating assembly 30 to mount the heating assembly 30 in a body of the aerosol-forming device by means of the mounting base 40. Specifically, the mounting base 40 is fixed at a position corresponding to the second heating region B on the heating assembly 30; and after the heating assembly is inserted into the aerosol-forming substance 302, a bottom end of the aerosol-forming substance 302 abuts against an upper surface of the mounting base 40.
Specifically, the material of the mounting base 40 may be an organic or inorganic material with a melting point above 160 degrees, for example, it may be a PEEK material. The mounting base 40 may be specifically bonded to the heating assembly 30 by an adhesive, which may be a high temperature resistant glue.
In some embodiments, referring to FIG. 13 and FIG. 14, the mounting base 40 includes a mounting body 41 defining a mounting hole 42, and the heating assembly 30 is specifically inserted in the mounting hole 42 to be mounted with the mounting base 40; in specific embodiments, when the heating body 32 of the heating assembly 30 is fixed to the mounting base 40, the portion of the heating body 32 corresponding to the second heating region B is inserted in the mounting hole 42. Specifically, a side wall of the mounting hole 42 defines an avoidance slot, through which the electrode leads specifically extend into the mounting base 40 to be connected with the electrodes on the heating body 32. Further, the mounting body 41 is arranged with at least two snap-in portions 43, and the mounting base 40 is specifically fixed to the housing of the aerosol-forming device by the snap-in portions 43.
Further, referring to FIG. 16, a side of the mounting body 41 may further define an extension slot 44 communicated with the mounting hole 42. The extension slot 44 may be defined specifically on a side surface of the third extension portion 323 back from the heat generator 32, and the shape the extension slot 44 matches with the shape of the portion of the heat generator assembly 30 configured to be inserted into the mounting base 40. For example, when the portion of the heat generator assembly 30 configured to be inserted into the mounting base 40 is rectangular in shape, the extension slot 44 is also rectangular in shape, so as to reinforce the portion of the heating assembly 30 inserted into the mounting base 40 by the extension slot 44 and prevent it from breaking. In specific embodiments, the mounting base 40 defines two extension slots 44, the two extension slots 44 being arranged crosswise and vertically.
In some embodiments, referring to FIG. 17, FIG. 17 is a main view of a structure where a mounting base is assembled with a heating assembly according to an embodiment of the present disclosure. A surface of the portion of the heating assembly 30 configured to be inserted into the mounting base 40 includes a first retaining structure 326, and a second retaining structure 327 is arranged at a position corresponding to the first retaining structure 326 in the mounting hole 42 of the mounting base 40. The first retaining structure 326 and the second retaining structure 327 are clamped together to achieve the fixation of the mounting base 40 and the heating assembly, thereby improving the stability of the connection between the two. The first retaining structure 326 may be multiple bumps (or recesses), and the second retaining structure 327 may be recesses (or bumps) matching the first retaining structure 326. Specifically, when the heating body 32 of the heating assembly 30 is fixed to the mounting base 40, the first retaining structure 326 may be arranged on a portion of the surface of the first extension portion 321 and the second extension portion 322 of the heating body 32 configured to be inserted into the mounting base 40. When the substrate 31 of the heating assembly 30 is fixed to the mounting base 40, the first retaining structure 326 may be specifically arranged on a portion of the surface of the substrate 31 configured to be inserted into the mounting base 40 (referring to FIG. 17).
For the heating assembly 30 provided in the embodiments, the heating form may be directly adopted with the self-supporting ceramic heating plate (or heating rod), and the heating body 32 may be arranged into a single-strip connection-in-series type according to the electrode layout control position and resistance value requirements. In addition, the heating body 32 is made of ceramic, compared with the existing heating body made of metal or ceramic substrate coated with metal heating material, can double-sided simultaneous contact with the tobacco and heating the tobacco, thereby heating more uniform and stable.
Referring to FIG. 18, FIG. 18 is a schematic view of an aerosol-forming device according to an embodiment of the present disclosure. In the embodiments, an aerosol-forming device 300 is provided, the aerosol-forming device 300 includes a housing 301 and a heating assembly 30, a mounting base 40, and a power supply assembly 50 that are arranged in the housing 301.
The heating assembly 30 is arranged on the mounting base 40 and is fixedly arranged on an inner wall surface of the housing 301 by the mounting base 40; specifically, the specific structure and function of the heating assembly 30 and the mounting base 40 may be found in the textual description of the heating assembly 30 in the relevant embodiments provided above, which will not be repeated herein; the power supply assembly 50 is connected to the heating assembly 30 for supplying power to the heating assembly 30. In some embodiments, the power supply assembly 50 may specifically be a rechargeable lithium-ion battery.
In the aerosol-forming device 300 provided in the embodiments, the heating assembly 30 is arranged to heat and atomize the aerosol-forming substance 302 after inserted into the aerosol-forming substance 302; the heating assembly 30 includes the substrate 31 and the heating body 32 to heat the tobacco in the aerosol-forming substance 302 through the heating body 32 after inserted into the aerosol-forming substance 302; in addition, the heating body 32 includes the first extension portion 321 and the second extension portion 322 connected to the first extension portion 321, and the substrate 31, and the first extension portion 321 and the second extension portion 322 of the heating body 32 are configured to be at least partially inserted into the aerosol-forming substance 302 and generate heat to heat the aerosol-forming substance 302 when energized; compared to the existing heating body screen-printed on the ceramic substrate, the substrate 31 and the heating body 32 of the present disclosure can be directly and independently inserted into the aerosol-forming substance 302, and there is no problem of the heating body 32 falling off from the ceramic substrate and causing failure after high-temperature heating, which greatly improves the stability of the heating assembly 30; in addition, by arranging the substrate 31, the heating body 32 is embedded in the substrate 31 to improve the strength, such that the heating assembly 30 may be stressed through the substrate 31 in the process of being inserted into the aerosol-forming substance 302, thereby effectively avoiding the problem of bending of the heating body 32 due to the stress.
The above is only some embodiments of the present disclosure, not to limit the scope of the present disclosure. Any equivalent structure or equivalent process transformation made by using the contents of the specification and the accompanying drawings of the present disclosure, or directly or indirectly applied in other related technical fields, are included in the scope of the present disclosure in the same way.

Claims

A heating assembly, comprising:
a substrate; and

a heating body, embedded in the substrate and comprising a first extension portion and a second extension portion connected to an end of the first extension portion; wherein the first extension portion and the second extension portion are spaced; the substrate, the first extension portion, and the second extension portion are configured to be at least partially inserted into an aerosol-forming substance and generate heat to heat the aerosol-forming substance when the first extension portion and the second extension portion are energized.
The heating assembly according to claim 1, wherein the substrate defines a receiving slot, and at least a portion of the heating body is accommodated in the receiving slot; the first extension portion and the second extension portion are arranged side by side and are spaced apart from each other; the heating body further comprises a third extension portion configured to be entirely inserted into and heat the aerosol-forming substance; an end of the first extension portion near the second extension portion and an end of the second extension portion near the first extension portion are connected with each other through the third extension portion.
The heating assembly according to claim 2, wherein the substrate comprises a first surface and a second surface back from the first surface, and the receiving slot is a through slot running through the first surface and the second surface, such that the heating body is exposed from a side with the first surface and a side with the second surface of the substrate.
The heating assembly according to claim 3, wherein the through slot comprises an opened end and a closed end; the third extension portion is disposed at a position where the closed end is located and extends from the closed end to form a tip.
The heating assembly according to claim 3, wherein the through slot comprises an opened end and a closed end; the third extension portion is disposed at a position near the closed end, and a position of the substrate near the closed end comprises a tip.
The heating assembly according to claim 5, wherein a first flange is arranged on an inner wall surface of the through slot near the second surface, and the heating body is lapped on the first flange.
The heating assembly according to claim 6, wherein the first flange extends along a circumferential direction of the through slot; the heating body has a first heat region and a second heat region connected to the first heat region; among the first heat region and the second heat region, only the first heat region is accommodated in the receiving slot and lapped on the first flange.
The heating assembly according to claim 7, wherein a portion of the first extension portion disposed in the second heat region comprises a first protrusion, and a portion of the second extension portion disposed in the second heat region comprises a second protrusion opposite to the first protrusion; the first protrusion and the second protrusion abut against two ends of the substrate.
The heating assembly according to claim 8, wherein each of the two ends of the substrate abutting against the first protrusion and the second protrusion is arranged with a second flange; each of a position of the first protrusion facing a corresponding second flange and a position of the second protrusion facing the other corresponding second flange is arranged with a first reserved portion; the first reserved portion is lapped on the second flange.
The heating assembly according to claim 6, wherein the heating body has a first heat region and a second heat region connected to the first heat region; the heating body is entirely accommodated in the receiving slot, the first flange comprises two first flanges arranged on the inner wall surface of the receiving slot only at positions corresponding the second heat region, and a portion of the heating body disposed in the second heat region is lapped on the two first flanges.
The heating assembly according to claim 10, wherein the portion of the heating body disposed in the second heat region is arranged with two second reserved portions facing the two first flanges, and the two second reserved portions are lapped on the two first flanges.
The heating assembly according to claim 10, wherein a ratio of the temperature of the first heat region to the temperature of the second heat region is greater than 2.
The heating assembly according to claim 1, further comprising a first electrode and a second electrode; wherein one of the first electrode and the second electrode is arranged on an end of the first extension portion away from the third extension portion, and the other one of the first electrode and the second electrode is arranged on an end of the second extension portion away from the third extension portion.
The heating assembly according to claim 13, wherein the one of the first electrode and the second electrode is disposed on a first surface and a second surface of the first extension portion, the second surface being opposite to the first surface; the other one of the first electrode and the second electrode is disposed on a first surface and a second surface of the second extension portion, the second surface being opposite to the first surface.
The heating assembly according to claim 13, further comprising a protective layer;
wherein the protective layer is coated on a surface of the heating body and covers the first electrode and the second electrode; or

the protective layer is coated on a surface of the substrate entirely and a portion of the surface of the heating body near the substrate, such that another portion of the surface of the heating body away from the substrate is exposed.
The heating assembly according to claim 1, wherein the heating body is a heating plate, and a spacing between the first extension portion and the second extension portion ranges from 0.25 mm to 0.35 mm.
The heating assembly according to claim 1, wherein the heating body further comprises a main component and a crystal component; the main component is one or more of manganese, strontium, lanthanum, tin, antimony, zinc, bismuth, silicon, titanium, and the crystal component is one or more of lanthanum manganate, lanthanum strontium manganate, tin oxide, zinc oxide, antimony oxide, bismuth oxide, silicon oxide, yttrium oxide.
The heating assembly according to claim 1, wherein the substrate is made of an insulating ceramic, and a bonding layer is arranged between the substrate and the heating body for bonding the substrate and the heating body.
The heating assembly according to claim 3, wherein the heating body and the substrate are each plate-shaped, and each of upper and lower surfaces of the heating body is flush with or projecting from or recessed into a corresponding one of the first surface and second surface of the substrate.
An aerosol-forming device, comprising a housing, the heating assembly according to claim 1, and a power supply assembly; wherein the heating assembly and the power supply assembly are arranged in the housing; the power supply assembly is connected to the heating assembly and is configured to supply power to the heating assembly.