Carbon fiber heating element, its preparation method and electronic cigarette atomizer

Abstract

The present invention provides a carbon fiber heating element, which comprises a plurality of carbon fiber heating layers. Each of the carbon fiber heating layers includes a plurality of carbon fiber unidirectional filaments arranged in sequence. The plurality of carbon fiber heating layers are stacked up and down, and a porous conductive layer is provided between two adjacent carbon fiber heating layers. The two adjacent carbon fiber heating layers are adhesively fixed through the porous conductive layer. The carbon fiber heating element of the present invention has both an oil guiding function and a heating and atomizing function, with a large atomization area and high atomization efficiency. The present invention also provides a preparation method of the carbon fiber heating element and an electronic atomizer.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic cigarettes, and in particular to a carbon fiber heating element, a preparation method thereof, and an electronic cigarette atomizer. Background Art

[0002] An electronic cigarette, also known as a virtual cigarette, a vapor cigarette, an aerosol generating device, etc., is mainly used to simulate the feeling of smoking without affecting health for smoking cessation or replacing cigarettes.

[0003] The atomization core of an electronic cigarette is the core component of the electronic cigarette atomizer. The heating element in the atomization core of the electronic cigarette is the core component for electrothermal conversion, and its main function is to heat the e-liquid (e-paste) to generate smoke. At present, the atomization core of an electronic cigarette generally uses oil guiding cotton and a heating mesh as the heating element, and the oil guiding cotton is attached to the heating mesh; when in use, after the oil guiding cotton absorbs the e-liquid from the oil storage cotton or the oil storage cavity, the e-liquid atomizes to form smoke at the position where the heating mesh contacts the oil guiding cotton. This method has limited atomization efficiency due to the small atomization contact area between the oil guiding cotton and the heating mesh, resulting in insufficient atomization. At the same time, the small atomization area will cause local overheating, and the oil guiding cotton has poor heat resistance and is prone to the phenomenon of core burning. Summary of the Invention

[0004] The purpose of the present invention is to provide a carbon fiber heating element that simultaneously has the functions of oil guiding and heating atomization, with a large atomization area and high atomization efficiency.

[0005] The present invention provides a carbon fiber heating element, which includes a plurality of carbon fiber heating layers. Each carbon fiber heating layer includes a plurality of carbon fiber unidirectional filaments arranged in sequence. The plurality of carbon fiber heating layers are stacked up and down, and a porous conductive layer is provided between adjacent two carbon fiber heating layers. Adjacent two carbon fiber heating layers are bonded and fixed through the porous conductive layer.

[0006] In a feasible manner, in each carbon fiber heating layer, the plurality of carbon fiber unidirectional filaments are arranged in sequence along the width direction of the carbon fiber heating element, and a gap is provided between adjacent two carbon fiber unidirectional filaments.

[0007] In a feasible manner, the porous conductive layer includes a first main body portion and a first penetration portion. The first main body portion is located between adjacent two carbon fiber heating layers, and the first penetration portion is located in the gap.

[0008] In a feasible manner, a first electrode material layer is further provided between adjacent two carbon fiber heating layers. The first electrode material layer is located at the edge position of the carbon fiber heating element; the first electrode material layer is in conductive contact with the porous conductive layer, and adjacent two carbon fiber heating layers are electrically connected through the first electrode material layer.

[0009] In an implementable manner, the first electrode material layer includes a second main part and a second penetration part. The second main part is located between two adjacent carbon fiber heating layers, and the second penetration part is located within the gap.

[0010] In an implementable manner, the carbon fiber heating element further includes an electrode block. The electrode block is arranged corresponding to the edge position of the carbon fiber heating element, and the electrode block is electrically connected to the outermost carbon fiber heating layer through a second electrode material layer.

[0011] In an implementable manner, the material of the porous conductive layer is a porous carbon material.

[0012] The present invention also provides a preparation method of a carbon fiber heating element for manufacturing the above-mentioned carbon fiber heating element. The preparation method of the carbon fiber heating element includes the following steps:

[0013] S10: Provide a plurality of carbon fiber unidirectional tapes. Each carbon fiber unidirectional tape includes a plurality of carbon fiber unidirectional filaments arranged in sequence.

[0014] S20: Print porous conductive paste on the first layer of the carbon fiber unidirectional tape, then lay the second layer of the carbon fiber unidirectional tape on the first layer of the carbon fiber unidirectional tape, and then print porous conductive paste on the second layer of the carbon fiber unidirectional tape.

[0015] S30: Repeat the above S20 step until a plurality of layers of the carbon fiber unidirectional tapes stacked in sequence are obtained.

[0016] S40: Cure the porous conductive paste on the plurality of layers of the carbon fiber unidirectional tapes, and then a carbon fiber heating element is obtained.

[0017] In an implementable manner, the number of each layer of the carbon fiber unidirectional tapes is a plurality, and the plurality of carbon fiber unidirectional tapes in each layer are arranged in sequence along the width direction of the carbon fiber heating element.

[0018] In an implementable manner, electrode paste is also printed at the edge position of each layer of the carbon fiber unidirectional tape. The S20 step specifically includes:

[0019] Print the porous conductive paste on the first layer of the carbon fiber unidirectional tape, and reserve a blank area at the edge position of the first layer of the carbon fiber unidirectional tape, and then dry the porous conductive paste on the first layer of the carbon fiber unidirectional tape.

[0020] After the surface of the porous conductive paste on the first layer of the carbon fiber unidirectional tape is dried, print the electrode paste on the blank area of the first layer of the carbon fiber unidirectional tape, and then lay the second layer of the carbon fiber unidirectional tape on the first layer of the carbon fiber unidirectional tape.

[0021] In an implementable manner, the step S30 further includes:

[0022] After obtaining the multiple layers of carbon fiber unidirectional tapes stacked in sequence, print the electrode paste on the outermost layer of the carbon fiber unidirectional tape, and then press the electrode block onto the electrode paste on the outermost layer of the carbon fiber unidirectional tape. The electrode block is bonded to the outermost layer of the carbon fiber unidirectional tape through the electrode paste.

[0023] In an implementable manner, the porous conductive paste is a porous carbon paste, and the composition of the porous carbon paste includes a carbon material, an inorganic filler silicate, diatomaceous earth, a dispersant silane coupling agent, and a solvent; wherein, the carbon material includes at least one of carbon, graphite, short-cut carbon fibers, and carbon nanotubes.

[0024] The present invention also provides an electronic cigarette atomizer, including the above-mentioned carbon fiber heating element.

[0025] The carbon fiber heating element provided by the present invention, by setting multiple carbon fiber heating layers, each carbon fiber heating layer includes multiple carbon fiber monofilaments, and a porous conductive layer is arranged between adjacent two carbon fiber heating layers as an adhesive. The gaps between the carbon fiber monofilaments, the carbon fiber monofilaments themselves, and the porous conductive layer can all conduct oil, so that the carbon fiber heating element as a whole has good oil conduction ability; at the same time, each carbon fiber heating layer and each porous conductive layer can absorb and atomize oil, so that the carbon fiber heating element can heat and atomize the e-liquid as a whole, with a large atomization area and high atomization efficiency. This carbon fiber heating element has both oil conduction and heating and atomization functions, eliminating the need for an oil guiding cotton. It not only has high atomization efficiency but also good heat resistance, and can avoid the phenomenon of core burning. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the carbon fiber heating element in the embodiment of the present invention.

[0027] Figure 2 is Figure 1 side view of.

[0028] Figure 3 is Figure 1 partial explosion structural schematic diagram of.

[0029] Figure 4 is Figure 1 cross-sectional schematic diagram of the middle position of the carbon fiber heating element in.

[0030] Figure 5 This is a schematic three-dimensional structure diagram of the carbon fiber heating element in another embodiment of the present invention. Specific embodiments

[0031] The following will further describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0032] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.

[0033] The orientation terms such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the description and claims of the present invention are defined based on the position of the structure in the accompanying drawings and the position relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of orientation terms should not limit the scope of protection claimed by the present invention.

[0034] As Figures 1 to 4 shown, the carbon fiber heating element provided in the embodiment of the present invention includes a plurality of carbon fiber heating layers 1. Each carbon fiber heating layer 1 includes a plurality of carbon fiber unidirectional filaments 11 arranged in sequence. The carbon fiber unidirectional filaments 11 are in a filamentous structure. The plurality of carbon fiber heating layers 1 are stacked up and down, and a porous conductive layer 2 is provided between two adjacent carbon fiber heating layers 1. The porous conductive layer 2 has a porous structure, and two adjacent carbon fiber heating layers 1 are bonded and fixed through the porous conductive layer 2.

[0035] As Figure 1 and Figure 2 shown, as an embodiment, in each carbon fiber heating layer 1, each carbon fiber unidirectional filament 11 extends along the length direction L of the carbon fiber heating element, and a plurality of carbon fiber unidirectional filaments 11 are arranged in sequence along the width direction W of the carbon fiber heating element, and a gap 12 is provided between two adjacent carbon fiber unidirectional filaments 11.

[0036] Specifically, for the carbon fiber heating element provided in this embodiment, by arranging a plurality of carbon fiber heating layers 1, each carbon fiber heating layer 1 includes multiple carbon fiber monofilaments 11, and a porous conductive layer 2 is arranged between two adjacent carbon fiber heating layers 1 as an adhesive. The carbon fiber monofilaments 11, the gaps 12 between the carbon fiber monofilaments 11, and each layer of the porous conductive layer 2 can all conduct oil, so that the carbon fiber heating element as a whole has good oil conduction ability; at the same time, each carbon fiber heating layer 1 and each porous conductive layer 2 can absorb and atomize oil, so that the carbon fiber heating element can heat and atomize the e-liquid as a whole, with a large atomization area and high atomization efficiency. This carbon fiber heating element has both oil conduction and heating and atomization functions, eliminating the need for an oil guiding cotton. It not only has high atomization efficiency but also good heat resistance, and can avoid the phenomenon of coil burning.

[0037] As Figure 4 shown, as an implementation manner, the porous conductive layer 2 includes a first main body portion 21 and a first penetration portion 22 that are connected to each other. The first main body portion 21 is located between two adjacent carbon fiber heating layers 1, and the first penetration portion 22 is located in the gap 12. The first penetration portion 22 located in the gap 12 can not only better bond the carbon fiber monofilaments 11 together but also play the functions of oil conduction and heating and atomization. The e-liquid can be guided from the upper carbon fiber heating layer 1 to the lower carbon fiber heating layer 1 through the first penetration portion 22, thereby improving the overall oil conduction and heating and atomization capabilities of the carbon fiber heating element.

[0038] As Figure 1 shown, as an implementation manner, the porous conductive layer 2 is located at the middle position of the carbon fiber heating element along its length direction L, and the material of the porous conductive layer 2 is a porous carbon material. A first electrode material layer 3 is further provided between two adjacent carbon fiber heating layers 1, and the first electrode material layer 3 is located at the edge position of the carbon fiber heating element along its length direction L. The first electrode material layer 3 is in conductive contact with the porous conductive layer 2, and two adjacent carbon fiber heating layers 1 are electrically connected through the first electrode material layer 3.

[0039] Specifically, since the material of the porous conductive layer 2 is a porous carbon material, and the resistance of the porous carbon material is generally large, it has good heating and atomization functions; however, due to the large resistance of the porous carbon material, and the edge positions on both sides of the carbon fiber heating element need to have a smaller resistance (the edge positions on both sides of the carbon fiber heating element serve as the electrodes of the carbon fiber heating element), and at the same time, since it is difficult to weld the carbon fiber monofilaments 11, a first electrode material layer 3 with a smaller resistance is arranged at the edge position of the carbon fiber heating element (the first electrode material layer 3 is generally made of silver paste, gold paste, copper paste, platinum paste, etc.). Two adjacent carbon fiber heating layers 1 are electrically connected through the first electrode material layer 3 to form an electrode structure with a smaller resistance at the edge position of the carbon fiber heating element, so as to facilitate conductive connection with an external power supply (not shown in the figure). Of course, asFigure 5 As shown, in other embodiments, the porous conductive layer 2 can also be made of a material with better electrical conductivity (of course, in this case, the heating and atomizing function of the porous conductive layer 2 will be weakened). At this time, the entire layer can be set as the porous conductive layer 2 (printing the porous conductive paste for the entire layer), and the first electrode material layer 3 does not need to be provided at the edge position.

[0040] As Figure 2 shown, as an implementation manner, the first electrode material layer 3 includes a second main body portion 31 and a second penetration portion 32. The second main body portion 31 is located between two adjacent carbon fiber heating layers 1, and the second penetration portion 32 is located in the gap 12. The second penetration portion 32 located in the gap 12 can better electrically connect each carbon fiber monofilament 11 together, so that each carbon fiber monofilament 11 has an overall conductive function, solving the problem that each carbon fiber monofilament 11 needs to be electrically connected.

[0041] As Figure 1 shown, as an implementation manner, the carbon fiber heating element further includes an electrode block 4, and the electrode block 4 can be a metal sheet or a metal mesh. The electrode block 4 is arranged corresponding to the edge position of the carbon fiber heating element. The electrode block 4 is electrically connected to the outermost carbon fiber heating layer 1 through a second electrode material layer 5, and the electrode block 4 is used to be electrically connected to a power supply. The second electrode material layer 5 can adopt the same electrode material as the first electrode material layer 3.

[0042] As Figure 1 shown, as an implementation manner, the number of the electrode blocks 4 is two, and the two electrode blocks 4 are respectively arranged on opposite sides of the carbon fiber heating element, and the two electrode blocks 4 are respectively used to be electrically connected to the positive and negative electrodes of the power supply.

[0043] As an implementation manner, the cross-section of the carbon fiber monofilament 11 can be circular, square or other structures.

[0044] The embodiment of the present invention also provides a preparation method of a carbon fiber heating element for manufacturing the above-mentioned carbon fiber heating element. The preparation method of the carbon fiber heating element includes the following steps:

[0045] S10: Provide a plurality of carbon fiber unidirectional tapes, and each carbon fiber unidirectional tape includes a plurality of carbon fiber monofilaments 11 arranged in sequence (that is, a carbon fiber unidirectional tape contains a plurality of carbon fiber monofilaments 11; since the diameter of the carbon fiber monofilament 11 is very small, it is not convenient to arrange and manufacture a single carbon fiber monofilament 11, but directly use the carbon fiber unidirectional tape to manufacture the carbon fiber heating element);

[0046] S20: Print a porous conductive paste on the first layer of carbon fiber unidirectional tape, then lay the second layer of carbon fiber unidirectional tape on the first layer of carbon fiber unidirectional tape, and then print the porous conductive paste on the second layer of carbon fiber unidirectional tape;

[0047] S30: Repeat the above S20 steps until the number of layers of the carbon fiber unidirectional tape reaches the target value (e.g., 3 - 4 layers), thereby obtaining multiple layers of carbon fiber unidirectional tapes stacked in sequence;

[0048] S40: Cure the porous conductive paste on the multiple layers of carbon fiber unidirectional tapes (e.g., perform heat treatment in an environment of 80 - 100 °C). After the porous conductive paste is cured, the solvent in the paste volatilizes, leaving the porous conductive layer 2 with a porous structure, thereby obtaining the carbon fiber heating element.

[0049] As an implementation manner, the number of carbon fiber unidirectional tapes in each layer is multiple, and the multiple carbon fiber unidirectional tapes in each layer are arranged in sequence along the width direction W of the carbon fiber heating element; that is, in the above S20 step, before printing the porous conductive paste on each layer of carbon fiber unidirectional tape, it is necessary to first evenly spread out the multiple carbon fiber unidirectional tapes in each layer along the width direction W (the adjacent carbon fiber unidirectional tapes can be closely arranged or there can be gaps), and then print the porous conductive paste on the multiple carbon fiber unidirectional tapes in that layer. Of course, in other embodiments, the number of carbon fiber unidirectional tapes in each layer can also be one, and the size of this one carbon fiber unidirectional tape is relatively large.

[0050] As Figure 4 shown, as an implementation manner, there is a gap 12 between two adjacent carbon fiber monofilaments 11 in each carbon fiber unidirectional tape. In the above S20 step, when printing the porous conductive paste on the carbon fiber unidirectional tape, a part of the porous conductive paste is located between the upper and lower adjacent layers of carbon fiber unidirectional tapes, and another part of the porous conductive paste penetrates into the gap 12 between the carbon fiber monofilaments 11. The porous conductive paste located between the upper and lower adjacent layers of carbon fiber unidirectional tapes forms the first main part 21 of the above porous conductive layer 2 after curing, and the porous conductive paste that penetrates into the gap 12 between the carbon fiber monofilaments 11 forms the first penetration part 22 of the above porous conductive layer 2 after curing.

[0051] As an implementation manner, electrode paste is also printed at the edge position of each layer of carbon fiber unidirectional tape. The above S20 step specifically includes:

[0052] Print the porous conductive paste on the first layer of carbon fiber unidirectional tape, and reserve a blank area at the edge position of the first layer of carbon fiber unidirectional tape, and then dry the porous conductive paste on the first layer of carbon fiber unidirectional tape (e.g., dry in an environment of 50 - 60 °C);

[0053] After the surface of the porous conductive paste on the first layer of carbon fiber unidirectional tape is dry, print the electrode paste in the blank area on the first layer of carbon fiber unidirectional tape. At this time, the electrode paste is in contact with the porous conductive paste, and then lay the second layer of carbon fiber unidirectional tape on the first layer of carbon fiber unidirectional tape.

[0054] That is, in the step S20, when printing the porous conductive paste on each layer of carbon fiber unidirectional tape, a blank area is reserved at the edge position of the carbon fiber unidirectional tape (for example, the width of the blank area is 1 mm, and the porous conductive paste is not printed in the blank area); after printing the porous conductive paste on each layer of carbon fiber unidirectional tape, the porous conductive paste is first dried, and then the porous conductive paste in the middle position is covered and protected by a protective film, and then the electrode paste is printed in the blank area; after the electrode paste is printed, the protective film is torn off, and then the next layer of carbon fiber unidirectional tape is laid.

[0055] As Figure 2 shown, as an implementation manner, when printing the electrode paste in the blank area on the carbon fiber unidirectional tape, a part of the electrode paste is located between the upper and lower adjacent layers of carbon fiber unidirectional tapes, and another part of the electrode paste penetrates into the gaps 12 between the carbon fiber unidirectional filaments 11. The electrode paste located between the upper and lower adjacent layers of carbon fiber unidirectional tapes forms the second main part 31 of the first electrode material layer 3 after curing, and the electrode paste that penetrates into the gaps 12 between the carbon fiber unidirectional filaments 11 forms the second penetration part 32 of the first electrode material layer 3 after curing.

[0056] As an implementation manner, the step S30 further includes:

[0057] After obtaining multiple layers of carbon fiber unidirectional tapes stacked in sequence, the electrode paste is printed on the outermost layer of carbon fiber unidirectional tape, and then the electrode block 4 is pressed onto the electrode paste of the outermost layer of carbon fiber unidirectional tape. The electrode block 4 is bonded to the outermost layer of carbon fiber unidirectional tape through the electrode paste, and the electrode block 4 serves as the electrode of the carbon fiber heating element.

[0058] As an implementation manner, the composition of the electrode paste includes an electrode material and a solvent. The electrode material is at least one of silver powder, gold powder, copper powder, and platinum powder, and the solvent is ethanol or ethyl acetate. The mass fractions of the components in the electrode paste are 80%-85% for the electrode material and 18%-29% for the solvent.

[0059] As an implementation manner, both the porous conductive paste and the electrode paste are printed by screen printing. The screen printing mesh number of the porous conductive paste is 600-700 meshes, and the screen printing thickness is 20-25 microns; the screen printing mesh number of the electrode paste is 600-700 meshes, and the screen printing thickness is 20-25 microns.

[0060] As an implementation manner, the above-mentioned porous conductive paste is a porous carbon paste, and the composition components of the porous carbon paste include a carbon material, an inorganic filler silicate, diatomaceous earth, a dispersant silane coupling agent, and a solvent. Among them, the carbon material includes at least one of carbon, graphite, chopped carbon fiber, and carbon nanotubes, and the solvent is ethanol or ethyl acetate. The mass fractions of the components in the porous carbon paste are 60%-65% for the carbon material, 10%-15% in total for the inorganic filler silicate and diatomaceous earth, 1%-2% for the dispersant silane coupling agent, and 18%-29% for the solvent.

[0061] Specifically, as Figure 1 shown, in this embodiment, since the porous conductive paste uses a porous carbon paste, and the resistance of the porous carbon paste is generally large, while the edge positions on both sides of the carbon fiber heating element need to have a small resistance, electrode paste with a small resistance is printed at the edge positions of each layer of carbon fiber unidirectional tape. As Figure 5 shown, as another implementation manner, when the porous conductive paste uses a paste with a small resistance, in the above S20 step, the porous conductive paste can also be printed on the entire layer of the carbon fiber unidirectional tape, and at this time, there is no need to print the electrode paste, thus simplifying the manufacturing steps.

[0062] The embodiment of the present invention also provides an electronic cigarette atomizer, including the above-mentioned carbon fiber heating element.

[0063] As an implementation manner, the electronic cigarette atomizer further includes a porous ceramic body (not shown in the figure), and an oil storage cavity (not shown in the figure) for storing e-liquid is provided in the porous ceramic body. The carbon fiber heating element is attached to the porous ceramic body, and the carbon fiber heating element can absorb oil from the porous ceramic body. The absorbed e-liquid is heated and atomized by the carbon fiber heating element to form a smoke for the user to inhale.

[0064] The advantages of the carbon fiber heating element and its preparation method provided by the embodiment of the present invention include:

[0065] 1. By providing a plurality of carbon fiber heating layers 1, each carbon fiber heating layer 1 includes a plurality of carbon fiber unidirectional filaments 11, and a porous conductive layer 2 is provided as a binder between two adjacent carbon fiber heating layers 1. The gaps 12 between the carbon fiber unidirectional filaments 11, the carbon fiber unidirectional filaments 11, and each layer of the porous conductive layer 2 can all conduct oil, so that the carbon fiber heating element as a whole has good oil conduction ability; at the same time, each carbon fiber heating layer 1 and each porous conductive layer 2 can absorb and atomize oil, so that the carbon fiber heating element can heat and atomize the e-liquid as a whole, with a large atomization area and high atomization efficiency. This carbon fiber heating element has both oil conduction and heating atomization functions, eliminating the need for an oil guide cotton. It not only has high atomization efficiency but also good heat resistance, and can avoid the phenomenon of core coking.

[0066] 2. Since carbon fiber is difficult to weld, an electrode structure is formed at the edge position of the carbon fiber heating element by printing electrode paste. The electrode paste is used to achieve the electrical connection between two adjacent carbon fiber heating layers 1. The electrode paste penetrates into the gaps 12 between the carbon fiber monofilaments 11 and connects each carbon fiber monofilament 11, solving the problems that carbon fiber cannot form electrodes by welding and each carbon fiber monofilament 11 needs to be electrically connected.

[0067] Example

[0068] Select large carbon fiber unidirectional tapes of grade T300 or T800, cut them into multiple carbon fiber unidirectional tapes with a size of 3mm * 5mm, and then evenly lay a part of the carbon fiber unidirectional tapes on a porous ceramic body with a porosity of 50%-55% to form the first layer of carbon fiber unidirectional tapes.

[0069] Screen-print porous carbon paste at a position 1mm away from the edge of the first layer of carbon fiber unidirectional tape. The composition of the porous carbon paste includes carbon materials, inorganic filler silicate, diatomaceous earth, dispersant silane coupling agent, and solvent. Among them, the carbon materials include at least one of carbon, graphite, short-cut carbon fiber, and carbon nanotubes, and the solvent is ethanol or ethyl acetate. The mass fractions of each component in the porous carbon paste are 60%-65% for carbon materials, 10%-15% in total for inorganic filler silicate and diatomaceous earth, 1%-2% for dispersant silane coupling agent, and 18%-29% for solvent. The screen-printing mesh number of the porous conductive paste is 600-700 mesh, and the screen-printing thickness is 20-25 microns.

[0070] Dry the porous carbon paste on the first layer of carbon fiber unidirectional tape at 50-60°C. After the surface of the porous carbon paste on the first layer of carbon fiber unidirectional tape is dried, cover and protect the porous carbon paste on the first layer of carbon fiber unidirectional tape with a protective film, and then screen-print electrode paste at the edge position of the first layer of carbon fiber unidirectional tape. Among them, the composition of the electrode paste includes electrode materials and solvent. The electrode materials are at least one of silver powder, gold powder, copper powder, and platinum powder, and the solvent is ethanol or ethyl acetate. The mass fractions of each component in the electrode paste are 80%-85% for electrode materials and 18%-29% for solvent. The screen-printing mesh number of the electrode paste is 600-700 mesh, and the screen-printing thickness is 20-25 microns.

[0071] After the electrode paste is printed, tear off the protective film, and then lay the second layer of carbon fiber unidirectional tape on the first layer of carbon fiber unidirectional tape. Repeat the above operations until 3-4 layers of carbon fiber unidirectional tapes are laminated. Finally, after printing conductive paste on the outermost layer of carbon fiber unidirectional tape, press the electrode block 4 on it, and then carry out a curing treatment to cure the porous carbon paste and the electrode paste, thus obtaining the carbon fiber heating element.

[0072] The above carbon fiber heating element was tested: compared with a general-purpose oil guide cotton of the same mass (the oil guide cotton adopts a structure of three layers of non-woven fabrics stacked), the oil absorption of the carbon fiber heating element is 0.20 - 0.25 g, and the oil absorption of the oil guide cotton is 0.20 - 0.22 g. The oil absorptions of the two are quite equivalent, indicating that the carbon fiber heating element has a good oil absorption function; at the same time, when atomizing 0.15 g of e-liquid, the carbon fiber heating element takes 1 - 2 seconds, while the oil guide cotton takes 3 - 5 seconds, indicating that the carbon fiber heating element has a good atomization function.

[0073] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A carbon fiber heating element, characterized in that, it comprises a plurality of carbon fiber heating layers (1), each of the carbon fiber heating layers (1) comprises a plurality of carbon fiber unidirectional filaments (11) arranged in sequence; the plurality of carbon fiber heating layers (1) are stacked up and down, and a porous conductive layer (2) is provided between two adjacent carbon fiber heating layers (1), and two adjacent carbon fiber heating layers (1) are adhesively fixed through the porous conductive layer (2); in each of the carbon fiber heating layers (1), the plurality of carbon fiber unidirectional filaments (11) are arranged in sequence along the width direction of the carbon fiber heating element, and a gap (12) is provided between two adjacent carbon fiber unidirectional filaments (11); the porous conductive layer (2) comprises a first main body portion (21) and a first penetration portion (22), the first main body portion (21) is located between two adjacent carbon fiber heating layers (1), and the first penetration portion (22) is located in the gap (12); The preparation method of the carbon fiber heating element comprises the following steps: S10: Provide a plurality of carbon fiber unidirectional tapes, each of the carbon fiber unidirectional tapes comprises a plurality of carbon fiber unidirectional filaments (11) arranged in sequence; S20: Print a porous conductive paste on the first layer of the carbon fiber unidirectional tape, then lay the second layer of the carbon fiber unidirectional tape on the first layer of the carbon fiber unidirectional tape, and then print a porous conductive paste on the second layer of the carbon fiber unidirectional tape; S30: Repeat the above S20 step until a plurality of layers of the carbon fiber unidirectional tapes stacked in sequence are obtained; S40: Cure the porous conductive paste on the plurality of layers of the carbon fiber unidirectional tapes, and thus obtain the carbon fiber heating element.

2. The carbon fiber heating element according to claim 1, characterized in that, a first electrode material layer (3) is further provided between two adjacent carbon fiber heating layers (1), and the first electrode material layer (3) is located at the edge position of the carbon fiber heating element; the first electrode material layer (3) is in conductive contact with the porous conductive layer (2), and two adjacent carbon fiber heating layers (1) are electrically connected through the first electrode material layer (3).

3. The carbon fiber heating element according to claim 2, characterized in that, the first electrode material layer (3) comprises a second main body portion (31) and a second penetration portion (32), the second main body portion (31) is located between two adjacent carbon fiber heating layers (1), and the second penetration portion (32) is located in the gap (12).

4. The carbon fiber heating element according to claim 1, characterized in that, the carbon fiber heating element further comprises an electrode block (4), the electrode block (4) is arranged corresponding to the edge position of the carbon fiber heating element, and the electrode block (4) is electrically connected to the outermost carbon fiber heating layer (1) through a second electrode material layer (5).

5. The carbon fiber heating element according to claim 1, characterized in that, the material of the porous conductive layer (2) is a porous carbon material.

6. A preparation method of a carbon fiber heating element, characterized in that, For manufacturing the carbon fiber heating element as described in any one of claims 1-5, the preparation method of the carbon fiber heating element comprises the following steps: S10: Provide a plurality of carbon fiber unidirectional tapes, each of the carbon fiber unidirectional tapes comprising a plurality of carbon fiber monofilaments (11) arranged in sequence; S20: Print porous conductive paste on the first layer of the carbon fiber unidirectional tape, then lay the second layer of the carbon fiber unidirectional tape on the first layer of the carbon fiber unidirectional tape, and then print porous conductive paste on the second layer of the carbon fiber unidirectional tape; S30: Repeat the above S20 step until a plurality of layers of the carbon fiber unidirectional tapes stacked in sequence are obtained; S40: Cure the porous conductive paste on the plurality of layers of the carbon fiber unidirectional tapes, thereby obtaining the carbon fiber heating element.

7. The preparation method of the carbon fiber heating element as described in claim 6, characterized in that, electrode paste is also printed at the edge position of each layer of the carbon fiber unidirectional tape, and the S20 step specifically comprises: Print the porous conductive paste on the first layer of the carbon fiber unidirectional tape, and reserve a blank area at the edge position of the first layer of the carbon fiber unidirectional tape, and then dry the porous conductive paste on the first layer of the carbon fiber unidirectional tape; After the surface of the porous conductive paste on the first layer of the carbon fiber unidirectional tape is dried, print the electrode paste in the blank area on the first layer of the carbon fiber unidirectional tape, and then lay the second layer of the carbon fiber unidirectional tape on the first layer of the carbon fiber unidirectional tape.

8. The preparation method of the carbon fiber heating element as described in claim 7, characterized in that, the S30 step further comprises: After obtaining a plurality of layers of the carbon fiber unidirectional tapes stacked in sequence, print the electrode paste on the outermost layer of the carbon fiber unidirectional tape, and then press the electrode block (4) onto the electrode paste on the outermost layer of the carbon fiber unidirectional tape, and the electrode block (4) is adhered to the outermost layer of the carbon fiber unidirectional tape through the electrode paste.

9. The preparation method of the carbon fiber heating element as described in claim 6, characterized in that, the porous conductive paste is porous carbon paste, and the composition components of the porous carbon paste include carbon material, inorganic filler silicate, silane coupling agent and solvent; wherein, the carbon material includes at least one of graphite, short carbon fiber and carbon nano.

10. An electronic cigarette atomizer, characterized in that, comprises the carbon fiber heating element as described in any one of claims 1-5.

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