An electronic cigarette core based on electrochemical deposition capillary structure and a preparation method thereof

Abstract

The application relates to an electronic cigarette core based on an electrochemical deposition capillary structure and a preparation method thereof, and belongs to the technical field of electronic cigarettes. The electronic cigarette core comprises a base body, an electrochemical deposition capillary layer, a heating assembly and an electrode. The base body is a high-temperature-resistant insulating base body, the outer surface of the base body is covered with the electrochemical deposition capillary layer, the heating assembly is embedded in the electrochemical deposition capillary layer or attached to the outer surface of the electrochemical deposition capillary layer, the electrode is electrically connected with the heating assembly, and the electrode extends to the outside of the base body for connecting a power supply device of the electronic cigarette. The bonding strength of the electrochemical deposition capillary layer and the base body is greater than or equal to 15 MPa, the electrochemical deposition capillary layer is a uniform porous structure, the porosity is 30% to 80%, the capillary pore size is 1 mu m to 10 mu m, and the capillary layer thickness is 5 mu m to 50 mu m. The application has the advantages of smooth liquid guiding, uniform atomization, simple structure, long service life and high safety.

Description

Technical Field

[0001] The invention belongs to the field of electronic cigarette technology, specifically relating to an electronic cigarette core based on electrochemical deposition capillary structure and its preparation method. It is applicable to the atomization core component of various electronic cigarettes and can effectively improve the atomization performance, service life and safety of electronic cigarettes. Background Technology

[0002] As the core functional component of an electronic cigarette, the e-cigarette core plays a crucial role in adsorbing and transporting e-liquid through capillary action, and then using a heating element to atomize the e-liquid for the user to inhale. Currently, the mainstream e-cigarette cores on the market are mainly divided into three categories: ceramic atomizing cores, cotton cores, and silicon-based atomizing cores. Each type of core has significant technical defects: ceramic atomizing cores are made using a high-temperature sintering process, resulting in poor uniformity of the internal honeycomb pore size. This can easily lead to uneven e-liquid atomization, localized overheating and carbonization, and pore blockage. Furthermore, the poor thermal conductivity of ceramic materials results in slow e-liquid atomization speed, affecting the vaping experience. Cotton cores use a structure where heating wires are wrapped with organic cotton to achieve liquid atomization. Under high-temperature conditions, the organic cotton is prone to atomization and inhalation by the user, posing potential health risks. In addition, cotton cores have a short lifespan, are prone to dry burning, have poor atomization stability, and are difficult to mass-produce using automated methods. Although silicon-based atomizing cores have better processing consistency, their mechanical strength is limited, making it difficult to manufacture through-hole structures with high aspect ratios. Their liquid retention and storage performance is poor, increasing the risk of explosion. They require additional liquid separators and storage components, resulting in a complex core structure and increased production costs.

[0003] Furthermore, the capillary liquid guiding structure of existing electronic cigarette cores is mostly prepared by mechanical processing or sintering molding processes. It is difficult to achieve precise control of the capillary pore size and the pore distribution is uneven, which leads to poor e-liquid transmission and failure to supply e-liquid to the heating area in a timely and even manner. This not only affects the continuity and stability of atomization, but may also cause dry burning due to local lack of liquid, shorten the life of the core, and produce harmful substances that endanger the health of users.

[0004] Currently, electrochemical deposition technology is widely used in the preparation of metal coatings, but no mature technical solutions have been publicly disclosed for its application in the preparation of capillary structures for e-cigarette cores. Even existing technologies that attempt to use deposition processes to prepare capillary structures suffer from problems such as weak bonding between the capillary layer and the substrate, difficulty in precisely controlling porosity and pore size, and insufficient liquid conduction efficiency, failing to meet the high-frequency atomization requirements of e-cigarette cores. Therefore, developing an e-cigarette core that provides smooth liquid conduction, uniform atomization, simple structure, long service life, and high safety has become an urgent technical problem to be solved in the current e-cigarette industry, and is also the core technical challenge that this invention aims to address. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of existing electronic cigarette cores, such as unreasonable capillary structure design, poor liquid conduction, uneven atomization, short service life, and insufficient safety. It also addresses the problems of weak bonding and difficulty in parameter control during the preparation of capillary structures in existing deposition processes. This invention provides an electronic cigarette core based on electrochemically deposited capillary structures and its preparation method. The electrochemical deposition process prepares a high-precision, uniformly distributed capillary structure, achieving efficient and uniform e-liquid transport, thereby improving atomization, extending the core's service life, and reducing the risk of harmful substance generation. Furthermore, it provides a stable and scalable preparation method.

[0006] To achieve the above objectives, the present invention provides an electronic cigarette core based on an electrochemically deposited capillary structure, specifically comprising a substrate, an electrochemically deposited capillary layer, a heating component, and an electrode; the substrate is a high-temperature resistant insulating substrate, the outer surface of which is covered with the electrochemically deposited capillary layer, the heating component is embedded inside the electrochemically deposited capillary layer or attached to the outer surface of the electrochemically deposited capillary layer, the electrode is electrically connected to the heating component, and the electrode extends to the outside of the substrate for connection with the power supply device of the electronic cigarette.

[0007] Furthermore, the substrate is made of any one of alumina ceramic, zirconia ceramic, or borosilicate glass. The substrate can be configured as a columnar, sheet-like, or bowl-shaped structure, with a groove pre-set on its surface for positioning the heating component, ensuring that the heating component is firmly installed and accurately positioned, and preventing displacement during use. The thickness of the substrate is 0.5mm to 3mm, the groove depth is 0.1mm to 0.5mm, and the groove width matches the size of the heating component, ensuring full contact between the heating component and the capillary layer.

[0008] Furthermore, the electrochemically deposited capillary layer is prepared on the substrate surface by an electrochemical deposition process. Its material is any one of copper, nickel, gold, or copper alloys, nickel alloys, or gold alloys. The electrochemically deposited capillary layer has a uniform porous structure with a porosity controlled between 30% and 80%, a capillary pore size of 1 μm to 10 μm, and uniform pore distribution. The capillary layer thickness is 5 μm to 50 μm, which can be flexibly adjusted according to actual usage requirements. The bonding strength between the electrochemically deposited capillary layer and the substrate is ≥15 MPa, ensuring that it does not detach or peel off during use.

[0009] Furthermore, the heating component is a heating wire or a heating film, wherein the heating wire is spirally embedded inside the electrochemically deposited capillary layer, and the heating film is tightly attached to the outer surface of the electrochemically deposited capillary layer. The heating component is made of any one of titanium alloy, nickel-chromium alloy, or platinum alloy, and has the characteristics of high temperature resistance, corrosion resistance, and excellent thermal conductivity. The diameter of the heating wire is 0.05mm to 0.2mm, the thickness of the heating film is 0.01mm to 0.1mm, and the power density of the heating component is 5W / cm² to 20W / cm², ensuring that the e-liquid is rapidly atomized without carbonization.

[0010] Furthermore, the electrode includes a positive electrode and a negative electrode, which are respectively electrically connected to the two ends of the heating component. The electrode is made of copper or nickel sheet and has an anti-oxidation coating on its surface to effectively prevent electrode oxidation failure. The electrode is connected to the heating component by welding or pressing to ensure a firm connection and good conductivity. The thickness of the electrode is 0.1mm to 0.3mm, the thickness of the anti-oxidation coating is 0.005mm to 0.02mm, and the conductivity of the electrode is ≤0.1Ω.

[0011] Furthermore, the outer surface of the electrochemically deposited capillary layer is also covered with a leak-proof coating, which is a polytetrafluoroethylene coating with a thickness of 1μm to 5μm. This coating can effectively prevent e-liquid from leaking from the pores and gaps of the capillary layer, thereby improving the sealing performance of the core. The contact angle of the leak-proof coating is ≥110° to ensure stable leak-proof performance.

[0012] Furthermore, the substrate is provided with a through-type air guide channel, which is connected to the electrochemically deposited capillary layer to smoothly guide the heated and atomized smoke, ensuring a smooth suction process and improving the user experience; the diameter of the air guide channel is 0.5mm to 2mm, and the number of air guide channels is 1 to 5, which can be flexibly set according to the substrate structure.

[0013] The method for preparing an electronic cigarette core based on electrochemically deposited capillary structures in this invention specifically includes the following steps: S1. Substrate Pretreatment: Select a high-temperature resistant insulating substrate and perform grinding, cleaning, and activation treatment on its surface to thoroughly remove surface impurities and oxide layers, and form uniform active sites on the substrate surface to ensure a tight bond between the capillary layer and the substrate. Grinding is performed using 800-1200 grit sandpaper, cleaning is performed using ultrasonic cleaning with an ultrasonic power of 100W-300W for 5-15 minutes, and activation treatment is performed by immersion in a 5%-10% dilute hydrochloric acid solution for 1-3 minutes. After immersion, rinse thoroughly with deionized water and dry at a temperature of 60℃-100℃ for 20-60 minutes.

[0014] S2. Electrochemical deposition preparation of capillary layer: The pretreated substrate is used as the cathode and placed in an electroplating solution containing the corresponding metal ions. A metal plate of the same material as the capillary layer is used as the anode. A constant current of 0.1A / dm² to 2A / dm² is applied for electrochemical deposition. The temperature of the electroplating solution is controlled at 25℃ to 45℃, the pH value is controlled at 3 to 6, and the deposition time is 5 min to 30 min. After deposition, the substrate and capillary layer are cleaned and dried to obtain a porous capillary layer with uniformly distributed pores. The cleaning is carried out by rinsing with deionized water 3 to 5 times, and the drying temperature is 60℃ to 100℃ for 20 min to 60 min.

[0015] S3. Heating component and electrode assembly: Embed the heating component inside the capillary layer or attach it to the outer surface of the capillary layer to ensure full contact between the heating component and the capillary layer; connect the electrode to both ends of the heating component by welding or pressing to ensure a firm connection and good conductivity, and extend the electrode to the outside of the substrate for connection with the power supply device of the electronic cigarette.

[0016] S4. Leakage prevention treatment: A polytetrafluoroethylene coating is applied to the outer surface of the electrochemically deposited capillary layer by spraying or dipping. After coating, the coating is cured at 120℃~180℃ for 10min~30min to form a leakage prevention coating, thus obtaining the electronic cigarette core based on the electrochemically deposited capillary structure.

[0017] Further, in step S2, the components of the electroplating solution include: 20g / L to 50g / L of metal salt, 10g / L to 20g / L of complexing agent, 5g / L to 10g / L of buffer, and 0.1g / L to 0.5g / L of brightener; wherein the metal salt is one of copper sulfate, nickel sulfate, or gold chloride, the complexing agent is citric acid or potassium sodium tartrate, the buffer is boric acid, and the brightener is sodium dodecyl sulfate.

[0018] The principles and effects of the present invention will be further explained below with reference to the above technical solutions and accompanying drawings: Compared with the prior art, the present invention has the following significant advantages: (1) This invention uses an electrochemical deposition process to prepare the capillary layer. Compared with traditional machining and sintering processes, it can precisely control the capillary pore size and porosity, resulting in a uniform pore distribution in the capillary layer and excellent capillary liquid conduction performance. This enables rapid and uniform transmission of e-liquid, effectively avoiding dry burning caused by localized liquid shortages. At the same time, it significantly improves the uniformity of e-liquid atomization and enhances the user's vaping experience. Experimental verification shows that, after standing for 10 seconds in simulated e-liquid at 25°C with a propylene glycol to glycerol mass ratio of 1:1, the capillary rise height of the capillary layer of this invention is more than 60% higher than that of the capillary structure of traditional ceramic cores. The e-liquid transmission efficiency is greatly improved, and the atomization uniformity is improved by more than 40%.

[0019] (2) By optimizing the substrate pretreatment process and electrochemical deposition parameters, the present invention makes the electrochemically deposited capillary layer tightly bonded to the substrate with a bonding strength ≥15MPa, and it is not easy to fall off. Moreover, the metal or alloy material used in the capillary layer has good thermal conductivity with a thermal conductivity coefficient ≥40W / (m·K), which can quickly and evenly transfer the heat generated by the heating component to the entire capillary layer, so that the e-liquid in the capillary layer is heated evenly, reducing the carbonization of e-liquid caused by local overheating and reducing the amount of harmful substances produced (after testing, the emission of harmful substances such as formaldehyde and acetaldehyde is reduced by more than 35% compared with traditional ceramic cores), while accelerating the atomization speed of e-liquid and improving the immediacy of vaping.

[0020] (3) The capillary layer is made of metal or alloy material, which has high mechanical strength, good wear resistance, and hardness ≥ HV150. Compared with traditional cotton core, the service life can be extended by 3 to 5 times. At the same time, the core structure of the present invention is simple and does not require additional liquid separation or liquid storage components, which facilitates large-scale automated production, increases production efficiency by more than 50%, and effectively reduces production costs.

[0021] (4) The anti-leakage coating (contact angle ≥110°) on the outer surface of the capillary layer can effectively prevent e-liquid leakage, reducing the leakage rate by more than 90%, and further improving the sealing of the core; the through-type air guide channel inside the base can ensure that the atomized smoke is smoothly discharged, avoiding problems such as smoke blockage and excessive suction resistance. The suction resistance is controlled at 10Pa~30Pa, further optimizing the user's vaping experience. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the axial cross-sectional structure of Embodiment 1 of the present invention; Figure 2 This is a magnified schematic diagram of the electrochemically deposited capillary layer in Example 1 of the present invention (magnification ratio is 1000x). Figure 3 This is a radial cross-sectional view of Embodiment 2 of the present invention. Figure Labels

[0023] 1-Substrate, 2-Electrochemically deposited capillary layer, 3-Heating component, 4-Electrode, 5-Leak-proof coating, 6-Gas channel. Detailed Implementation

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Example 1 like Figure 1 , Figure 2As shown, this embodiment provides an electronic cigarette core based on an electrochemically deposited capillary structure, specifically including a substrate 1, an electrochemically deposited capillary layer 2, a heating component 3, and an electrode 4; the substrate 1 is made of alumina ceramic material, has a columnar structure, and a thickness of 1mm. It has a through-type air channel 6 with a diameter of 1mm inside. The outer surface of the substrate 1 has a pre-set spiral groove for positioning the heating component 3, with a groove depth of 0.3mm, to ensure that the heating component 3 is installed stably.

[0025] The electrochemically deposited capillary layer 2, made of copper, was prepared on the outer surface of the substrate 1 using an electrochemical deposition process. The specific preparation process was as follows: First, the surface of the substrate 1 was polished with 800-grit sandpaper and ultrasonically cleaned at 300W for 10 minutes to thoroughly remove surface impurities and the oxide layer. Then, it was activated by immersion in an 8% dilute hydrochloric acid solution for 2 minutes to form uniform active sites on the substrate surface. The treated substrate 1 was used as the cathode, and the copper sheet as the anode, both immersed in a solution containing copper sulfate (30 g / L), citric acid (15 g / L), boric acid (8 g / L), and sodium dodecyl sulfate (0.3 g / L). In an electroplating solution containing g / L, the temperature of the electroplating solution was controlled at 35℃, the pH value was controlled at 4.5, a constant current of 0.5A / dm² was applied, and the deposition time was controlled at 10min. After deposition, the substrate and capillary layer were repeatedly washed three times with deionized water to remove residual electroplating solution from the surface. Then, it was dried at 80℃ for 30min to finally obtain an electrochemically deposited capillary layer 2 with a thickness of 20μm. The porosity of the capillary layer was 65%, the capillary pore size was 3μm~10μm, the pore distribution was uniform, the liquid conductivity was excellent, and the bonding strength between the capillary layer and the substrate was 18MPa.

[0026] The heating element 3 is a nickel-chromium alloy heating wire with a diameter of 0.1 mm. It is spirally embedded inside the electrochemically deposited capillary layer 2 and closely adheres to the spiral groove on the surface of the substrate 1, ensuring full contact between the heating wire and the capillary layer and improving heat transfer efficiency. The power density of the heating element is 12 W / cm². The electrode 4 includes a positive electrode and a negative electrode, made of copper sheet with a thickness of 0.2 mm. Its surface is covered with a 0.01 mm thick anti-oxidation coating, which can effectively prevent electrode oxidation. The positive electrode and the negative electrode are respectively connected to the two ends of the heating wire by welding. The electrode 4 extends to the outside of the substrate 1 for connection with the power supply device of the electronic cigarette to realize power transmission. The conductivity of the electrode is 0.08 Ω.

[0027] The outer surface of the electrochemically deposited capillary layer 2 is covered with a polytetrafluoroethylene anti-leakage coating 5 with a thickness of 2μm and a contact angle of 115°. This coating can effectively prevent e-liquid from leaking out of the pores and gaps of the capillary layer, improve the sealing of the core, and avoid e-liquid waste and leakage risks.

[0028] The working principle of this embodiment is as follows: the e-liquid is quickly and evenly adsorbed and transported to the heating component 3 through the capillary action of the electrochemically deposited capillary layer 2; the power supply device of the electronic cigarette supplies power to the heating component 3 through the electrode 4; after the heating component 3 is powered on, it generates heat and quickly atomizes the surrounding e-liquid; the atomized smoke is smoothly discharged through the air guide channel 6 inside the substrate 1 for the user to inhale, the overall inhalation experience is smooth and the taste is uniform, and the draw resistance is 20Pa. Example 2

[0029] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that: the substrate 1 is made of borosilicate glass, has a bowl-shaped structure, and a thickness of 1.5 mm. It contains two air-guiding channels 6, each with a diameter of 0.8 mm, which are connected to the bottom of the bowl-shaped structure, allowing for greater capacity of e-liquid. The electrochemically deposited capillary layer 2 is made of gold and is prepared on the inner and outer surfaces of the substrate 1 using an electrochemical deposition process. It has a thickness of 15 μm, a porosity of 80%, and capillary pore sizes ranging from 2 μm to 10 μm, resulting in higher liquid guiding efficiency. The bonding strength between the capillary layer and the substrate is... 20MPa; Heating component 3 is a platinum alloy heating film with a thickness of 0.05mm, which is tightly attached to the inner surface of the electrochemically deposited capillary layer 2 by sputtering process, so that the heat transfer is more direct and uniform. The power density of the heating component is 15W / cm²; Electrode 4 is a nickel sheet with a thickness of 0.25mm, which is connected to both ends of the heating film by pressing. The connection is firm and has good conductivity. The conductivity resistance of the electrode is 0.07Ω; The anti-leakage coating 5 has a thickness of 3μm, a contact angle of 120°, and a suction resistance of 18Pa; The rest of the structure is consistent with that of Example 1.

[0030] In this embodiment, the bowl-shaped substrate 1 can hold more e-liquid and extend the life of the core; the electrochemically deposited capillary layer 2 covers the inner and outer surfaces of the substrate, further increasing the liquid guiding area and improving the liquid guiding efficiency; the heating film is attached to the inner surface of the capillary layer, which can directly transfer heat to the e-liquid, resulting in faster atomization speed, more uniform atomization, and a more delicate vaping experience. Example 3

[0031] The difference between this embodiment and Embodiment 1 is as follows: the electrochemically deposited capillary layer 2 is made of nickel alloy; the electroplating solution is a mixed system of nickel sulfate (40 g / L), potassium sodium tartrate (18 g / L), boric acid (7 g / L), and sodium dodecyl sulfate (0.4 g / L); the deposition current is 1.5 A / dm²; the deposition time is 5 min; the electroplating solution temperature is controlled at 40℃; and the pH value is controlled at 5. The final capillary layer has a thickness of 10 μm, a porosity of 35%, a capillary pore size of 1 μm to 5 μm, and a bonding strength with the substrate of 16 MPa. The heating element 3 is a titanium alloy heating wire with a diameter of 0.08 mm and a power density of 8 W / cm². The remaining structure and parameters are consistent with those of Embodiment 1. The capillary layer of this embodiment is suitable for electronic cigarette cores with low porosity requirements, provides stable liquid conduction, and has a lower risk of dry burning.

[0032] Comparative Example 1 (Traditional Ceramic Atomizing Core) The mainstream ceramic atomizing cores on the market were selected. Their structure includes a ceramic substrate, a ceramic capillary layer, a heating wire, and an electrode. The ceramic capillary layer is prepared by high-temperature sintering process, with a porosity of 50% and a capillary diameter of 5μm to 20μm. The heating wire is a nickel-chromium alloy, and the power density is the same as in Example 1. The other parameters are matched with those in Example 1.

[0033] Comparative Example 2 (Traditional Cotton Core) The mainstream cotton cores on the market were selected. Their structure includes a cotton core matrix, an organic cotton capillary layer, a heating wire, and an electrode. The heating wire is a nickel-chromium alloy, and its power density is the same as that in Example 1. The other parameters are the same as those in Example 1.

[0034] Comparative Example 3 (Capillary core prepared by existing deposition process) The capillary core was prepared using a publicly available electrochemical deposition process. The substrate was alumina ceramic, the capillary layer was made of copper, the deposition current was 0.3 A / dm², no substrate activation treatment was performed, the capillary layer thickness was 20 μm, the porosity was 60%, and the rest of the structure was the same as in Example 1.

[0035] Performance test comparison Performance tests were conducted on the electronic cigarette cores of Examples 1, 2, and 3, and Comparative Examples 1, 2, and 3. The test items included: capillary rise height, e-liquid delivery efficiency, atomization uniformity, harmful substance emission, lifespan, leakage rate, and draw resistance. The test conditions were 25°C and simulated e-liquid with a propylene glycol to glycerol mass ratio of 1:1. The test results are shown in the table below.

[0036] As can be seen from the above test results, the electronic cigarette cores of Embodiments 1, 2 and 3 of the present invention are significantly superior to traditional ceramic atomizing cores, cotton cores and capillary cores prepared by existing deposition processes in terms of capillary rise height, e-liquid transmission efficiency, atomization uniformity and service life. Moreover, they have lower harmful substance emissions and leakage rate, and more suitable draw resistance, which fully demonstrates the technical advantages and creativity of the present invention and solves the core defects of the prior art.

[0037] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An electronic cigarette core based on an electrochemically deposited capillary structure, characterized in that, The device includes a substrate, an electrochemically deposited capillary layer, a heating component, and an electrode. The substrate is a high-temperature resistant insulating substrate, and its outer surface is covered with the electrochemically deposited capillary layer. The heating component is embedded inside the electrochemically deposited capillary layer or attached to the outer surface of the electrochemically deposited capillary layer. The electrode is electrically connected to the heating component and extends to the outside of the substrate for connecting to the power supply device of the electronic cigarette. The bonding strength between the electrochemically deposited capillary layer and the substrate is ≥15MPa. The electrochemically deposited capillary layer has a uniform porous structure with a porosity of 30% to 80%, a capillary pore size of 1μm to 10μm, and a capillary layer thickness of 5μm to 50μm.

2. The electronic cigarette core according to claim 1, characterized in that, The electrochemically deposited capillary layer is made of copper, nickel, gold, or a copper alloy, nickel alloy, or gold alloy.

3. The electronic cigarette core according to claim 1, characterized in that, The substrate is made of alumina ceramic, zirconia ceramic or borosilicate glass, and the substrate has a columnar, sheet or bowl-shaped structure, and its surface is provided with grooves for positioning the heating component; the thickness of the substrate is 0.5mm to 3mm, and the depth of the groove is 0.1mm to 0.5mm.

4. The electronic cigarette core according to claim 1, characterized in that, The heating component is a heating wire or a heating film. The heating wire is spirally embedded inside the electrochemically deposited capillary layer, and the heating film is tightly attached to the outer surface of the electrochemically deposited capillary layer. The heating component is made of one of titanium alloy, nickel-chromium alloy, or platinum alloy. The diameter of the heating wire is 0.05 mm to 0.2 mm, the thickness of the heating film is 0.01 mm to 0.1 mm, and the power density of the heating component is 5 W / cm² to 20 W / cm².

5. The electronic cigarette core according to claim 1, characterized in that, The electrode includes a positive electrode and a negative electrode, which are electrically connected to both ends of the heating component. The electrode is made of copper or nickel sheet with an anti-oxidation coating on its surface. The electrode is connected to the heating component by welding or pressing. The electrode has a thickness of 0.1 mm to 0.3 mm, the anti-oxidation coating has a thickness of 0.005 mm to 0.02 mm, and the electrode has a conductivity resistance of ≤0.1 Ω.

6. The electronic cigarette core according to claim 1, characterized in that, The outer surface of the electrochemically deposited capillary layer is also covered with a leak-proof coating, which is a polytetrafluoroethylene coating with a thickness of 1μm to 5μm and a contact angle of ≥110°.

7. The electronic cigarette core according to claim 1, characterized in that, The substrate has a through-hole gas guiding channel, which is connected to the electrochemically deposited capillary layer; the diameter of the gas guiding channel is 0.5 mm to 2 mm, and the number of gas guiding channels is 1 to 5.

8. A method for preparing an electronic cigarette core based on electrochemically deposited capillary structures, characterized in that, The electronic cigarette core is the electronic cigarette core according to any one of claims 1 to 7, and includes the following steps: S1. Substrate pretreatment: Select a high-temperature resistant insulating substrate, and perform grinding, cleaning, and activation treatment on its surface to remove surface impurities and oxide layers and form uniform active sites. S2. Electrochemical deposition to prepare capillary layer: The pretreated substrate is used as the cathode and placed in an electroplating solution containing metal ions. A metal plate of the same material as the capillary layer is used as the anode. A constant current of 0.1A / dm² to 2A / dm² is applied for electrochemical deposition. After deposition, the substrate is cleaned and dried to obtain a porous capillary layer. S3. Heating component and electrode assembly: The heating component is embedded inside the capillary layer or attached to the outer surface of the capillary layer. The electrodes are connected to both ends of the heating component and the electrodes extend to the outside of the substrate. S4. Leakage prevention treatment: Coating the outer surface of the electrochemically deposited capillary layer with a polytetrafluoroethylene coating and curing it to obtain the electronic cigarette core.

9. The preparation method according to claim 8, characterized in that, In step S1, grinding is done with 800-1200 grit sandpaper, cleaning is done with 100W-300W ultrasonic cleaning for 5-15 minutes, activation treatment is done by soaking in 5%-10% dilute hydrochloric acid solution for 1-3 minutes; drying temperature is 60℃-100℃, and drying time is 20-60 minutes.

10. The preparation method according to claim 8, characterized in that, In step S2, the temperature of the electroplating solution is 25℃~45℃, the pH value is 3~6, and the deposition time is 5min~30min; the components of the electroplating solution include: 20g / L~50g / L of metal salt, 10g / L~20g / L of complexing agent, 5g / L~10g / L of buffer, and 0.1g / L~0.5g / L of brightener; wherein, the metal salt is one of copper sulfate, nickel sulfate or gold chloride, the complexing agent is citric acid or potassium sodium tartrate, the buffer is boric acid, and the brightener is sodium dodecyl sulfate.

11. The preparation method according to claim 8, characterized in that, In step S4, the coating method is spraying or dipping, the curing temperature is 120℃~180℃, and the curing time is 10min~30min.

12. An electronic cigarette, characterized in that, Including the electronic cigarette core based on electrochemically deposited capillary structure as described in any one of claims 1 to 7.

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