A preparation method of a chip-type solid-liquid hybrid aluminum electrolytic capacitor

Abstract

The present invention relates to the field of electronic component manufacturing technology, specifically to a method for preparing a chip-type solid-liquid hybrid aluminum electrolytic capacitor, comprising: performing microstructural electrolytic treatment on an aluminum foil core material to obtain a pretreated aluminum foil; providing a dispersion liquid based on the surface porosity of the pretreated aluminum foil; immersing the pretreated aluminum foil in the dispersion liquid to generate a solid-liquid mixed layer, the immersion time being 580 to 620 seconds; drying the solid-liquid mixed layer using a gradient cooling method to obtain a dried aluminum foil core material, adjusting the concentration of the dispersion liquid based on the surface curing degree of the dried aluminum foil core material; immersing the dried aluminum foil core material in the dispersion liquid after adjusting the concentration, the immersion time being 250 to 300 seconds, to obtain a cured aluminum foil core material; electrically connecting and sealing the cured aluminum foil core material to an electronic component and a housing to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor. This application improves the accuracy and efficiency of the production process and solves the problem that traditional aluminum electrolytic capacitors are prone to failure in harsh environments such as high temperature and high humidity.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic component manufacturing, and in particular to a method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor. Background Art

[0002] Aluminum electrolytic capacitors, widely used energy storage components in electronic devices, offer advantages such as high capacitance, compact size, and low cost. However, while the liquid electrolyte in existing aluminum electrolytic capacitors can provide the required capacitance, the use of liquid electrolytes can easily reduce capacitor reliability. This is particularly true in environments with high temperatures and large humidity fluctuations, where electrolyte leakage or volatilization can lead to capacitor failure and even affect the stability of the entire device.

[0003] The development of solid-state electrolytic capacitors has gradually become an effective way to address the problems of traditional aluminum electrolytic capacitors. By using a solid electrolyte instead of a liquid electrolyte, solid-state electrolytic capacitors avoid problems such as leakage, volatilization, and corrosion, significantly improving the stability and safety of the capacitor. However, in practical applications, solid-state electrolytic capacitors face challenges such as small capacity and poor conductivity of the solid electrolyte. Therefore, the concept of solid-liquid hybrid aluminum electrolytic capacitors came into being.

[0004] Although solid-liquid hybrid aluminum electrolytic capacitors have theoretical advantages, existing solid-liquid hybrid aluminum electrolytic capacitors cannot effectively combine solid and liquid electrolytes and cannot form a uniform and stable mixed layer on the aluminum foil surface. Although existing technologies use different solid-liquid mixing methods, due to the instability of the solid-liquid interface, the mixed layer may become uneven or defective during the production process, affecting the performance of the final capacitor. Therefore, improving the precision and efficiency of the solid-liquid hybrid aluminum electrolytic capacitor production process and optimizing the bonding effect between aluminum foil and electrolyte have become technical issues that need to be solved urgently in this field. Summary of the Invention

[0005] The main purpose of the present invention is to provide a method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor, aiming to overcome the technical problem of poor bonding between aluminum foil and electrolyte in the existing solid-liquid hybrid aluminum electrolytic capacitor production process.

[0006] In order to achieve the above-mentioned invention problem, the present invention proposes a method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor, the method comprising:

[0007] The aluminum foil core material is subjected to microstructure electrolysis treatment to form a specific micropore distribution structure on the surface of the aluminum foil to obtain a pretreated aluminum foil;

[0008] providing a dispersion based on the surface porosity of the pretreated aluminum foil, wherein the concentration of the dispersion matches the porosity of the specific micropore distribution structure;

[0009] Immersing the pretreated aluminum foil in the dispersion for 580 to 620 seconds to form a solid-liquid mixed layer on the surface of the pretreated aluminum foil;

[0010] Drying the solid-liquid mixed layer by a gradient cooling method to obtain a dried aluminum foil core material, and adjusting the concentration of the dispersion liquid based on the surface curing degree of the dried aluminum foil core material;

[0011] Immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration for 250 to 300 seconds to obtain a cured aluminum foil core material;

[0012] The cured aluminum foil core material is electrically connected to and sealed with the electronic component and the housing to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor.

[0013] Furthermore, the dispersion is a mixed solution containing nanoscale conductive particles and an electrolyte, the nanoscale conductive particles are uniformly dispersed in the electrolyte, the particle size of the nanoscale conductive particles ranges from 80 to 100 nanometers, the solvent of the electrolyte is an organic solvent, the organic solvent is at least one of ethylene glycol, propylene glycol, butanediol or pentanediol, and the electrolyte is at least one of a quaternary ammonium salt, a quaternary phosphonium salt or an imidazole salt.

[0014] Furthermore, the step of performing microstructure electrolysis treatment on the aluminum foil core material to form a specific micropore distribution structure on the surface of the aluminum foil to obtain the pretreated aluminum foil includes:

[0015] Electrolyzing the surface of the aluminum foil core material with an electrolyte, controlling the electrolysis current density to be 10-30 A / dm², and making the surface porosity of the aluminum foil core material 35-40%, thereby obtaining a microstructured aluminum foil;

[0016] Acquiring a surface state of the microstructured aluminum foil, adjusting a metal ion concentration of the electrolyte according to the surface state, and performing a secondary electrolysis treatment on the microstructured aluminum foil based on the adjusted electrolyte;

[0017] The microstructured aluminum foil after the secondary electrolysis treatment is cooled, and the cooling rate is controlled to be 0.8-1°C per second, so that the diameter of the micropores is 1-1.2 microns, thereby obtaining the pretreated aluminum foil.

[0018] Furthermore, the step of providing a dispersion based on the surface porosity of the pretreated aluminum foil, wherein the concentration of the dispersion matches the porosity of the specific micropore distribution structure, comprises:

[0019] Calculating the required particle concentration of the dispersion according to the porosity of the specific microporous distribution structure to obtain a dispersion concentration range suitable for the porosity;

[0020] Measuring the particle size of the initial dispersion, and adjusting the proportion of additives to the initial dispersion according to the particle size so that the particle size of the initial dispersion conforms to the dispersion concentration range;

[0021] The particle sedimentation of the initial dispersion after adjusting the additive ratio in different time periods is tested, and the pH value of the dispersion is adjusted according to the test results to obtain the dispersion.

[0022] Furthermore, the step of immersing the pretreated aluminum foil in the dispersion for 580 to 620 seconds to form a solid-liquid mixed layer on the surface of the pretreated aluminum foil comprises:

[0023] The dispersion is heated at a temperature of 90-100° C.

[0024] Placing the pretreated aluminum foil in the dispersion, setting the initial immersion depth to 50% of the thickness of the aluminum foil, and obtaining surface tension data of the dispersion;

[0025] According to the surface tension data of the dispersion, gradually increase the immersion depth to 100% of the thickness of the aluminum foil, so that the pretreated aluminum foil is completely immersed in the dispersion and maintain it for 580-620 seconds;

[0026] A mechanical stirring device is used to apply uniform micro-oscillation to the dispersion liquid, with a frequency set at 1-5 Hz, so that a solid-liquid mixed layer is generated on the surface of the pretreated aluminum foil.

[0027] Furthermore, the step of drying the solid-liquid mixed layer by a gradient cooling method to obtain a dried aluminum foil core material includes:

[0028] The solid-liquid mixed layer is heated to 90-100° C. and maintained at this temperature for 5 minutes to obtain a preliminarily solidified mixed layer;

[0029] Obtaining thickness data of the preliminary solidified mixed layer, and calculating the heat conduction rate of the thickness data during the gradient cooling process based on a conduction equation to obtain a cooling rate;

[0030] The preliminary solidified mixed layer is cooled according to the cooling rate for 10 minutes until the temperature drops to room temperature, thereby obtaining the dried aluminum foil core material.

[0031] Furthermore, the step of adjusting the concentration of the dispersion based on the surface curing degree of the dried aluminum foil core material includes:

[0032] Obtaining a surface spectrum of the dried aluminum foil core material using an infrared spectrometer, setting the spectrum to cover a wavenumber range of 500-400 cm⁻¹, and obtaining absorption peaks at each wavelength band on the surface;

[0033] Fitting the absorption peaks of each wavelength band according to the peak positions of the surface spectrum to obtain the integrated areas of the surface absorption peaks;

[0034] calculating a solidification degree of the solid-liquid mixed layer based on the integrated area, and determining whether a concentration of the dispersion reaches a threshold value according to the solidification degree;

[0035] If yes, the current concentration of the dispersion is maintained; if not, the ratio of the nano-scale conductive particles and the electrolyte in the dispersion is adjusted according to the difference ratio between the curing degree and the threshold value until the desired concentration threshold is reached.

[0036] Furthermore, the step of immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration for 250 to 300 seconds to obtain a solidified aluminum foil core material comprises:

[0037] Immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration, and measuring the flow rate information of the dispersion liquid using a flow meter;

[0038] Adjusting the circulation rate of the dispersion according to the flow rate information so that the dispersion is evenly covered on the surface of the dried aluminum foil core material;

[0039] The immersion temperature is controlled to be 60-70° C. so that the nano-scale conductive particles and electrolyte components in the dispersion can effectively penetrate into the microporous structure of the dried aluminum foil core material;

[0040] The dispersion is subjected to low-frequency vibration treatment using an ultrasonic device, with the frequency set at 20-30 kHz and the immersion time maintained at 250-300 seconds;

[0041] After the soaking is completed, the dried aluminum foil core material is taken out from the dispersion liquid and naturally cooled to room temperature to obtain the solidified aluminum foil core material.

[0042] Furthermore, the step of electrically connecting and sealing the cured aluminum foil core material with the electronic component and the housing to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor includes:

[0043] The end surface of the aluminum foil core material is activated by plasma treatment to form a microstructure with high surface energy on its surface, thereby obtaining an activated aluminum foil end surface;

[0044] butting the end surface of the activated aluminum foil against the pin of the electronic component to form a preliminary electrical connection;

[0045] Based on the use of ultrasonic welding technology, the aluminum foil core material and the electronic component after the preliminary electrical connection are electrically welded to form a stable electrical connection;

[0046] Pressing the aluminum foil core material and the electronic components to form a stable electrical connection, and assembling the pressed aluminum foil core material and the electronic components into a housing;

[0047] The shell is sealed with epoxy resin to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor.

[0048] Beneficial effects:

[0049] The present application proposes a method for preparing a patch-type solid-liquid hybrid aluminum electrolytic capacitor. Through microstructure electrolysis treatment, a specific microporous distribution structure is formed on the surface of the aluminum foil, which improves the bonding effect between the aluminum foil and the electrolyte and enhances the stability of the electrolyte, thereby significantly improving the electrical performance and reliability of the capacitor. By adjusting the concentration of the dispersion to match the porosity of the aluminum foil surface, the uniformity of the solid-liquid mixed layer is achieved. By adjusting the time of the first impregnation with the dispersion from 300 seconds to 600 seconds, the core is allowed to enter the core as much as possible during the first impregnation with the dispersion. The solid-liquid mixed layer is dried using a gradient cooling method, effectively controlling the curing process and optimizing the surface curing degree of the cured aluminum foil core material, thereby improving the service life and working stability of the aluminum electrolytic capacitor. This method further optimizes the curing process by adjusting the immersion time and liquid concentration, significantly improving the internal resistance, withstand voltage and other performance of the capacitor, and the encapsulated capacitor has higher sealing and stronger resistance to environmental changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the steps of a method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to one embodiment of the present invention;

[0051] Figure 2 The figure is a schematic diagram of the steps of a method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to an embodiment of the present invention.

[0052] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0054] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of features, integers, steps, operations, elements, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or wireless couplings. The term "and / or" used herein includes all or any module and all combinations of one or more associated listed items.

[0055] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as such, will not be interpreted in an idealized or overly formal sense.

[0056] Reference Figure 1 The present invention provides a method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor, the method comprising:

[0057] S1: performing microstructure electrolytic treatment on the aluminum foil core material to form a specific micropore distribution structure on the aluminum foil surface to obtain a pretreated aluminum foil;

[0058] In step S1, aluminum foil is the basic material of electrolytic capacitors. For solid-liquid hybrid aluminum electrolytic capacitors, the distribution and porosity of micropores on the surface of the aluminum foil affect the adhesion effect of the electrolyte and the stability of the solid-liquid interface. After the aluminum foil undergoes microstructure electrolysis treatment, a certain microporous structure will be formed on its surface. Specifically, by placing the aluminum foil in an electrolyte and applying a certain current density and voltage, a specific oxide film is formed on the surface of the aluminum foil, and tiny holes are generated on the surface of the oxide film through electrochemical reactions. These micropores have a certain size range, which is nanometer or micrometer level. In actual operation, a higher current density and an appropriate electrolyte temperature can promote the formation of micropores, while the length of the electrolysis time determines the depth and number of the micropores. In this process, a uniform pore structure will gradually form on the surface of the aluminum foil, and the porosity can be controlled according to the regulation of the electrolysis time and current to achieve the desired microstructure characteristics.

[0059] S2: providing a dispersion based on the surface porosity of the pretreated aluminum foil, wherein the concentration of the dispersion matches the porosity of the specific micropore distribution structure;

[0060] In step S2, the porosity of the aluminum foil surface is controlled by electrolytic treatment, and by regulating parameters such as the composition of the electrolyte, current density and electrolysis time, the surface structure of the aluminum foil with different porosities can be achieved. For example, if the electrolytic treatment of the aluminum foil forms a surface structure with higher porosity, it is necessary to provide a dispersion of higher concentration to ensure that the dispersion can fully soak into and adhere to the aluminum foil surface. The dispersion can be composed of a solid electrolyte, a solvent and a suitable additive, and the additive can be used to improve the dispersibility of the electrolyte or enhance the bonding force of the electrolyte and the aluminum foil surface. In actual operation, by measuring the porosity of the aluminum foil surface, the required dispersion concentration range is calculated, and then an immersion experiment is carried out to observe the formation of the solid-liquid mixed layer to ensure its uniformity and stability. For example, if the surface porosity of the aluminum foil is 30%, by adjusting the dispersion concentration to a certain value, a relatively uniform solid-liquid mixed layer is formed on the surface, indicating that concentration and porosity are matched, and desired effect has been achieved.

[0061] S3: soaking the pretreated aluminum foil in the dispersion for 580 to 620 seconds to form a solid-liquid mixed layer on the surface of the pretreated aluminum foil;

[0062] In step S3, the pretreated aluminum foil is immersed in the prepared dispersion. After a certain period of immersion, the components in the dispersion will penetrate into the surface micropores of the aluminum foil, thereby forming a uniform solid-liquid mixed layer on the surface of the aluminum foil. Specifically, the immersion time is set to 580 to 620 seconds. By adjusting the time of the first immersion in the dispersion, 300 seconds is extended to 600 seconds, so that when the core is immersed in the dispersion for the first time, as much dispersion as possible enters the core without excessive retention or insufficient filling of all pores. If the immersion time is too short, the dispersion may not be able to penetrate into the micropores, resulting in uneven thickness of the solid-liquid mixed layer, or even failure to form a stable mixed layer; and if the immersion time is too long, it may cause excessive dispersion to remain on the surface of the aluminum foil, thereby affecting subsequent processing steps, and even causing instability of the solid-liquid layer or affecting the performance of the capacitor. Through immersion, a uniform solid-liquid mixed layer will be formed on the surface of the aluminum foil. The formation of this layer depends on the original micropore distribution characteristics of the aluminum foil surface, as well as the composition and concentration of the electrolyte in the dispersion.

[0063] S4: drying the solid-liquid mixed layer by a gradient cooling method to obtain a dried aluminum foil core material, and adjusting the concentration of the dispersion liquid based on the surface curing degree of the dried aluminum foil core material;

[0064] In step S4, the solid-liquid mixed layer formed on the surface of the aluminum foil is affected by the gradual decrease in temperature during the drying process, so that the solid-liquid layer on the surface of the aluminum foil gradually hardens and stabilizes. This cooling process starts from a higher temperature and gradually decreases to room temperature or a temperature close to room temperature. The specific cooling rate and temperature range depend on factors such as the properties of the dispersion used, the material of the aluminum foil core material, and the thickness of the solid-liquid mixed layer. By using the gradient cooling method, the solid-liquid mixed layer can avoid uneven solidification while removing the dispersion liquid, and by reducing the drying temperature from 160 degrees to 125 degrees, the core is in a semi-wet state after the first dispersion liquid impregnation and drying, which facilitates the easier entry of the dispersion liquid during the second impregnation. The concentration of the dispersion liquid is adjusted according to the surface curing degree of the dried aluminum foil core material. During the drying process, the curing degree of the solid-liquid layer reflects the changes in the surface structure. If the curing degree is low, that is, the formation of the solid-liquid mixed layer is incomplete or has failed to stabilize, so it is necessary to increase the concentration of the dispersion liquid; and if the curing degree is high, it means that the solid-liquid layer has reached a relatively stable state, and the concentration of the dispersion liquid can be appropriately reduced.

[0065] S5: soaking the dried aluminum foil core material in the dispersion liquid with adjusted concentration for 250 to 300 seconds to obtain a solidified aluminum foil core material;

[0066] In step S5, the dried aluminum foil core material has been subjected to a gradient cooling process in step S4. At this time, the surface solid-liquid mixed layer has been preliminarily solidified, but the degree of solidification at this time has not fully reached the ideal state. The concentration of the dispersion liquid has been adjusted according to the surface solidification degree of the dried aluminum foil core material to ensure that it matches the porosity of the aluminum foil surface structure. The aluminum foil core material is immersed in the dispersion liquid with adjusted concentration, and the immersion time is set to 250~300 seconds. This time period is enough to enable the aluminum foil surface to obtain the required curing effect, and it can also prevent the immersion time from being too long and causing over-curing, which affects the further stability of the surface structure. During the immersion process, the interaction between the dispersion liquid and the solid-liquid mixed layer on the aluminum foil surface enables the aluminum foil surface to further complete the curing process, fix and form a firm surface structure, and ensure the appropriate matching of surface porosity and degree of solidification.

[0067] S6: Electrically connecting and sealing the cured aluminum foil core material with the electronic components and the housing to obtain a packaged SMD solid-liquid hybrid aluminum electrolytic capacitor.

[0068] In step S6, the cured aluminum foil core is electrically connected to electronic components. Electronic components, such as conductive leads and positive and negative connection pins, are auxiliary components used to adjust the electrical performance of the capacitor. To ensure proper operation of the capacitor, electrical connections are made by welding or wire bonding, and the aluminum foil core is sealed to the outer casing. The outer casing of an aluminum electrolytic capacitor is made of metal or plastic, providing physical protection and preventing external environmental factors (such as moisture and oxygen) from affecting the capacitor's performance. To achieve a good seal, sealant, epoxy resin, or other sealing materials are used to connect the outer casing to the aluminum foil core. These materials can be formulated based on the surface condition of the aluminum foil core, the characteristics of the solid-liquid hybrid layer, and the requirements of the operating environment to ensure a good seal without compromising the stability of the electrical connection. After completing the electrical connection and sealing, the packaged SMD solid-liquid hybrid aluminum electrolytic capacitor undergoes multiple tests, such as electrical performance testing, sealing testing, and withstand voltage testing, to ensure that the packaged capacitor meets the intended function and stability. If the test results pass, the capacitor is ready for use.

[0069] In one embodiment, the dispersion is a mixed solution containing nanoscale conductive particles and an electrolyte, the nanoscale conductive particles are uniformly dispersed in the electrolyte, the particle size of the nanoscale conductive particles ranges from 80 to 100 nanometers, the solvent of the electrolyte is an organic solvent, the organic solvent is at least one of ethylene glycol, propylene glycol, butanediol or pentanediol, and the electrolyte is at least one of a quaternary ammonium salt, a quaternary phosphonium salt or an imidazole salt.

[0070] In the above-described embodiment, the nanometer-level conductive particles in the dispersion are uniformly dispersed in the electrolyte, and the particle size range is strictly controlled between 80 to 100 nanometers to ensure best dispersion effect and electrical property, improve the electrical conductivity of the electrolyte, and also help to form more uniform and close solid-liquid mixed layer on the aluminum foil surface. The solvent in the electrolyte is at least one organic solvent in ethylene glycol, propylene glycol, butylene glycol or pentanediol, and these organic solvents have good solubility and stability, can effectively carry other components in the nanometer-level conductive particles and the electrolyte, ensure that in the soaking process, can evenly penetrate into the micropores on the aluminum foil surface. The electrolyte is at least one of quaternary ammonium salt, quaternary phosphonium salt or imidazole salt. These electrolytes have excellent ion conductivity and chemical stability, can form stable ion conductive layer on the aluminum foil surface, help to improve electrical property and the stability of the capacitor. Simultaneously, the solubility of these electrolytes is moderate, can form a good mixed solution with nanometer-level conductive particles and organic solvent, ensure the uniformity and stability of the dispersion.

[0071] In one embodiment, the step of performing microstructure electrolysis treatment on the aluminum foil core material to form a specific micropore distribution structure on the surface of the aluminum foil to obtain the pretreated aluminum foil includes:

[0072] Electrolyzing the surface of the aluminum foil core material with an electrolyte, controlling the electrolysis current density to be 10-30 A / dm², and making the surface porosity of the aluminum foil core material 35-40%, thereby obtaining a microstructured aluminum foil;

[0073] Acquiring a surface state of the microstructured aluminum foil, adjusting a metal ion concentration of the electrolyte according to the surface state, and performing a secondary electrolysis treatment on the microstructured aluminum foil based on the adjusted electrolyte;

[0074] The microstructured aluminum foil after the secondary electrolysis treatment is cooled, and the cooling rate is controlled to be 0.8-1°C per second, so that the diameter of the micropores is 1-1.2 microns, thereby obtaining the pretreated aluminum foil.

[0075] In the above-described embodiment, during the electrolytic treatment of the microstructure of the aluminum foil core material, an electrolyte is used to electrolyze the aluminum foil surface, thereby changing the surface structure of the aluminum foil. The electrolytic current density is controlled between 10 and 30 A / dm². This current density range effectively forms a stable and uniform microporous structure on the aluminum foil surface. Specifically, a lower current density may result in the formation of coarse or irregular pores, while a higher current density may cause excessive electrolysis, resulting in excessively small pores and even damage to the aluminum foil surface by the electrolyte. Therefore, the current density range of 10 to 30 A / dm² is intended to optimize the size and distribution of micropores, thereby controlling the porosity of the aluminum foil surface between 35% and 40%. After the first round of electrolytic treatment, the metal ion concentration of the electrolyte is adjusted based on the surface state of the microstructured aluminum foil, thereby affecting the formation and structure of pores on the aluminum foil surface. Adjusting the metal ion concentration can change the conductivity of the electrolyte, thereby affecting the electrolytic reaction rate on the aluminum foil surface. In this process, increasing the metal ion concentration can accelerate the electrolytic reaction, while reducing the metal ion concentration can reduce the intensity of the electrolytic reaction. By controlling the metal ion concentration of the electrolyte, it is possible to ensure that the required microporous structure is formed on the surface of the aluminum foil. After completing the secondary electrolytic treatment, the microstructured aluminum foil needs to be cooled at a rate of 0.8 to 1°C per second. This cooling rate can prevent defects such as uneven microporous structure or cracks caused by excessively fast cooling rates while ensuring uniform micropore size. The slow cooling process allows the diameter of the micropores to be controlled between 1 and 1.2 microns, giving it better oxidation resistance and a longer service life, while reducing the amount of liquid electrolyte used.

[0076] In one embodiment, the step of providing a dispersion based on the surface porosity of the pretreated aluminum foil, wherein the concentration of the dispersion matches the porosity of the specific microporous distribution structure, comprises:

[0077] Calculating the required particle concentration of the dispersion according to the porosity of the specific microporous distribution structure to obtain a dispersion concentration range suitable for the porosity;

[0078] Measuring the particle size of the initial dispersion, and adjusting the proportion of additives to the initial dispersion according to the particle size so that the particle size of the initial dispersion conforms to the dispersion concentration range;

[0079] The particle sedimentation of the initial dispersion after adjusting the additive ratio in different time periods is tested, and the pH value of the dispersion is adjusted according to the test results to obtain the dispersion.

[0080] In the above embodiment, the appropriate dispersion concentration and particle concentration range are determined by calculating the porosity of the pretreated aluminum foil surface. Porosity refers to the proportion of micropores on the aluminum foil surface, which is related to the size and concentration of particles in the dispersion, because aluminum foil with higher porosity requires the use of a dispersion with higher particle concentration to ensure that the particles can be evenly distributed and effectively fill the pores. By calculating the porosity of the pretreated aluminum foil surface, the particle concentration range required for the dispersion can be obtained. This range is determined based on the size and distribution of the pores on the aluminum foil surface and the energy storage performance required by the electrolytic capacitor. After calculating the required particle concentration range, the particle size in the initial dispersion is measured, and the proportion of additives in the dispersion is adjusted based on these size data. Additives are used to improve the stability of the dispersion and prevent particles from settling or agglomerating. By adjusting the proportion of additives, it is possible to ensure that the particle size meets the required dispersion concentration range and the stability of the dispersion is ensured to achieve uniform filling of the aluminum foil pores. After adjusting the additive ratio, the dispersion's particle size falls within the predetermined concentration range. Further testing is then required to examine the particle sedimentation of the adjusted dispersion over different time periods. Particle sedimentation refers to the gradual sinking of particles in a dispersion due to gravity. Based on the results of the particle sedimentation test, the pH of the dispersion can be adjusted. Changes in pH can affect the dispersion properties of particles in a dispersion because different pH environments produce different charges on the particle surface, which in turn alters the particles' aggregation and sedimentation rate. Adjusting the pH can optimize particle interactions and reduce particle aggregation, thereby improving the stability of the dispersion and ensuring its effectiveness in practical applications.

[0081] In one embodiment, the step of immersing the pretreated aluminum foil in the dispersion for 580 to 620 seconds to form a solid-liquid mixed layer on the surface of the pretreated aluminum foil comprises:

[0082] The dispersion is heated at a temperature of 90-100° C.

[0083] Placing the pretreated aluminum foil in the dispersion, setting the initial immersion depth to 50% of the thickness of the aluminum foil, and obtaining surface tension data of the dispersion;

[0084] According to the surface tension data of the dispersion, gradually increase the immersion depth to 100% of the thickness of the aluminum foil, so that the pretreated aluminum foil is completely immersed in the dispersion and maintain it for 580-620 seconds;

[0085] A mechanical stirring device is used to apply uniform micro-oscillation to the dispersion liquid, with a frequency set at 1-5 Hz, so that a solid-liquid mixed layer is generated on the surface of the pretreated aluminum foil.

[0086] In the above embodiment, the dispersion is heated to 90-100°C to enhance the activity of the particles in the dispersion and improve their compatibility with the aluminum foil surface. The elevated dispersion temperature helps reduce the tendency of particles to settle in the dispersion. After the heat treatment, the pretreated aluminum foil is immersed in the dispersion. The initial immersion depth is set to 50% of the foil thickness. During the initial immersion stage, this ensures that the surface of the foil gradually comes into contact with the dispersion, thereby controlling the formation of a solid-liquid mixed layer. Setting the initial immersion depth to half the foil's thickness effectively prevents excessive liquid from directly entering the deeper layers of the foil, which could cause over-immersion or uneven distribution of the surface layer. This stage not only ensures uniform distribution of the liquid on the foil surface but also facilitates subsequent precise control of the immersion process. During the initial contact stage between the aluminum foil and the dispersion, surface tension data of the dispersion is obtained to determine the interaction force between the dispersion and the foil surface. Surface tension data can reflect the properties of the dispersion, including its viscosity, particle distribution, and affinity for the foil surface. Based on this data, the immersion depth of the dispersion can be precisely adjusted. Specifically, while monitoring surface tension data, the immersion depth of the aluminum foil is gradually increased until it reaches 100% of its thickness, meaning the foil is completely immersed in the dispersion. This controlled process ensures that the dispersion fully penetrates every layer of the foil throughout the immersion process, resulting in a uniform solid-liquid mixed layer. By gradually increasing the immersion depth, it is possible to avoid uneven distribution of the dispersion due to excessive immersion, which could affect the quality of the solid-liquid mixed layer. During the immersion process, the immersion time is controlled between 580 and 620 seconds to ensure sufficient formation of the solid-liquid mixed layer while avoiding excessive adsorption or sedimentation of the dispersion due to prolonged immersion, which could affect the electrochemical properties of the aluminum foil. During the immersion process, a mechanical stirring device is used to uniformly micro-oscillate the dispersion at a frequency between 1 and 5 Hz. This gentle vibration enhances the fluidity and uniform distribution of the particles in the dispersion while preventing sedimentation or aggregation. The micro-oscillation frequency is adjusted within the 1-5 Hz range, which effectively ensures particle movement and dispersion without excessively disturbing the stability of the liquid or the aluminum foil surface, thereby contributing to the formation of a more uniform solid-liquid mixed layer.

[0087] In one embodiment, the step of drying the solid-liquid mixed layer by a gradient cooling method to obtain a dried aluminum foil core material comprises:

[0088] The solid-liquid mixed layer is heated to 90-100° C. and maintained at this temperature for 5 minutes to obtain a preliminarily solidified mixed layer;

[0089] Obtaining thickness data of the preliminary solidified mixed layer, and calculating the heat conduction rate of the thickness data during the gradient cooling process based on a conduction equation to obtain a cooling rate;

[0090] The preliminary solidified mixed layer is cooled according to the cooling rate for 10 minutes until the temperature drops to room temperature, thereby obtaining the dried aluminum foil core material.

[0091] In the above embodiment, the solid-liquid mixed layer is heated to 90-100°C and maintained at this temperature for 5 minutes to form a preliminarily solidified mixed layer. This allows the liquid component in the solid-liquid mixed layer to gradually evaporate, thereby allowing the solid particles in the mixed layer to more tightly bind together, forming a preliminarily solidified layer. The thickness of this mixed layer is then obtained, and the heat conduction rate is calculated using a conduction equation. During the heat conduction process, heat is transferred from the surface to the interior of the solid-liquid mixed layer. The heat conduction rate is affected by factors such as the thickness of the mixed layer, temperature differences, and the thermal conductivity of the material. Using the conduction equation and the obtained thickness data, the heat conduction rate at different locations during the cooling process can be calculated. Based on the obtained heat conduction rate, the cooling process of the preliminarily solidified mixed layer is controlled for 10 minutes until the temperature drops to room temperature. This prevents uneven solidification caused by excessively rapid cooling and ensures that the materials in the mixed layer solidify stably as the temperature gradually decreases. Using the calculated cooling rate, the cooling process is precisely controlled within the required time and temperature range, thereby maintaining a uniform structure in the solid-liquid mixed layer of the aluminum foil core material and preventing cracks or incomplete solidification caused by excessive temperature differences. The entire cooling process is completed within 10 minutes, and the cooling rate is adjusted based on the thickness data of the initially solidified mixed layer and the results of heat conduction analysis to ensure that the mixed layer cools evenly from high temperature to room temperature. Through the entire drying process, the structure of the solid-liquid mixed layer is stabilized and the performance of the aluminum foil core material is fully optimized.

[0092] In one embodiment, reference Figure 2 The step of adjusting the concentration of the dispersion based on the surface curing degree of the dried aluminum foil core material comprises:

[0093] S431: Obtaining a surface spectrum of the dried aluminum foil core material using an infrared spectrometer, setting the spectrum to cover a wavenumber range of 500 to 400 cm⁻¹, and obtaining absorption peaks of each wavelength band on the surface;

[0094] S432: fitting the absorption peaks of each wavelength band according to the peak positions of the surface spectrum to obtain the integrated areas of the surface absorption peaks;

[0095] S433: Calculating a solidification degree of the solid-liquid mixed layer based on the integrated area, and determining whether a concentration of the dispersion reaches a threshold value according to the solidification degree;

[0096] S434: If yes, maintain the current concentration of the dispersion; if not, adjust the ratio of the nano-scale conductive particles and the electrolyte in the dispersion according to the difference ratio between the curing degree and the threshold value until the desired concentration threshold is reached.

[0097] In steps S431-S434, an infrared spectrometer is used to obtain a surface spectrum of the dried aluminum foil core material. The wavenumber range of the spectrum is set between 500 and 400 cm⁻¹. This wavenumber range effectively captures the chemical composition information of the solid-liquid mixed layer, particularly the relevant absorption peaks. The absorption peak locations are more accurately extracted from the infrared spectrum, and the integrated area of each absorption peak is calculated using a fitting method. The integrated area represents the absorption intensity at a specific wavelength and the substance content or composition information associated with that wavelength. Specifically, the absorption peaks of the solid-liquid mixed layer at different wavelengths reflect the molecular vibrations and chemical reactions of the substances within the layer. The fitted integrated area, combined with a pre-defined spectral data model, can be used to calculate the degree of solidification of the solid-liquid mixed layer. The degree of solidification refers to the degree of conversion of solid components within the mixed layer. By calculating the degree of solidification, the integrity and uniformity of the solidified layer on the surface of the dried aluminum foil core material can be determined. Based on the calculated degree of solidification, a threshold concentration of the dispersion liquid is determined. This concentration threshold is experimentally verified or theoretically derived to ensure the ideal performance of the solid-liquid mixed layer in the final product. If the degree of cure calculation indicates that the dispersion concentration has reached the threshold, the curing process is sufficient and the reaction of the mixed layer is essentially complete. At this point, the current dispersion concentration can be maintained without further adjustment. If the degree of cure is lower than the threshold, it indicates that the reaction of the solid-liquid mixed layer is not yet complete, or there is a deviation in the composition ratio of the solid-liquid mixed layer. In this case, the ratio of nano-scale conductive particles and electrolyte in the dispersion needs to be adjusted based on the difference between the degree of cure and the threshold. Specifically, the amount of nano-scale conductive particles and the ratio of electrolyte will directly affect the curing process of the solid-liquid mixed layer and the final electrical and mechanical properties of the capacitor. If the degree of cure is low, increasing the proportion of conductive particles will improve the conductivity of the capacitor. At the same time, the concentration or composition of the electrolyte may also need to be adjusted to promote the curing reaction and ensure the structural stability of the mixed layer. Based on the difference between the degree of cure and the threshold, the proportions of these components are adjusted until the desired degree of cure is achieved and the concentration of the dispersion meets the standard, thereby achieving the desired capacitor performance.

[0098] In another embodiment, the calculation expression of the degree of curing in the above embodiment is: ,in The degree of solidification indicates the solidification progress of the solid-liquid mixed layer, ranging from 0 to 1, where 0 indicates completely unsolidified and 1 indicates completely solidified; is the integrated area of the i-th absorption peak (the output of the fitting result), and is related to the wavelength band The absorbance intensity is proportional to It is the correction factor of the absorption peak, which is used to describe the correlation between the absorption peak in different wavelength bands and the degree of curing; is the wavelength position of the i-th absorption peak; N is the total number of absorption peaks. During the fitting process, the positions and intensities of multiple absorption peaks may be obtained; α is the rate constant of the curing reaction; T is the temperature of the curing reaction, which affects the reaction rate and is combined with time, and the unit is Kelvin (K); Describes the effect of temperature and time on the degree of cure during the curing reaction and represents the progress of the curing reaction at a given temperature.

[0099] In one embodiment, the step of immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration for 250 to 300 seconds to obtain a solidified aluminum foil core material comprises:

[0100] Immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration, and measuring the flow rate information of the dispersion liquid using a flow meter;

[0101] Adjusting the circulation rate of the dispersion according to the flow rate information so that the dispersion is evenly covered on the surface of the dried aluminum foil core material;

[0102] The immersion temperature is controlled to be 60-70° C. so that the nano-scale conductive particles and electrolyte components in the dispersion can effectively penetrate into the microporous structure of the dried aluminum foil core material;

[0103] The dispersion is subjected to low-frequency vibration treatment using an ultrasonic device, with the frequency set at 20-30 kHz and the immersion time maintained at 250-300 seconds;

[0104] After the soaking is completed, the dried aluminum foil core material is taken out from the dispersion liquid and naturally cooled to room temperature to obtain the solidified aluminum foil core material.

[0105] In the above embodiment, a dried aluminum foil core is immersed in a dispersion of adjusted concentration for a duration of 250 to 300 seconds, allowing the nano-conductive particles in the dispersion to fully contact and penetrate the microporous structure of the aluminum foil core, achieving the desired curing effect. A flow meter monitors the flow rate of the dispersion in real time to maintain proper flow during the immersion process. This data allows for accurate regulation of the dispersion's circulation rate, ensuring a uniform coating on the aluminum foil surface. The immersion temperature is controlled between 60 and 70°C to promote penetration of the dispersion's components into the aluminum foil's micropores. The dispersion is then subjected to low-frequency vibrations using an ultrasonic device. This acoustic wave action maintains a uniform dispersion of the particles, preventing them from settling or agglomerating, and ensuring a uniform and stable coating. The ultrasonic frequency is set between 20 and 30 kHz. This low-frequency vibration frequency generates sufficient acoustic energy to effectively disperse the nano-particles in the dispersion and further facilitates penetration of the dispersion into the aluminum foil's micropores. After the immersion process is complete, the dried aluminum foil core is removed from the dispersion and allowed to cool naturally to room temperature. During this stage, the conductive particles in the dispersion react with the components on the surface and in the pores of the aluminum foil core, gradually solidifying into a film. Natural cooling to room temperature ensures the stability of the curing process, avoiding problems such as incomplete curing or uneven film formation caused by excessively high or low temperatures. The cooled aluminum foil core is now a cured aluminum foil core, and the conductive film layer covering its surface has tightly bonded to the aluminum foil surface, forming a core component of an aluminum electrolytic capacitor with excellent conductive properties.

[0106] In one embodiment, the step of electrically connecting and sealing the cured aluminum foil core material with the electronic component and the housing to obtain a packaged surface-mount solid-liquid hybrid aluminum electrolytic capacitor includes:

[0107] The end surface of the aluminum foil core material is activated by plasma treatment to form a microstructure with high surface energy on its surface, thereby obtaining an activated aluminum foil end surface;

[0108] butting the end surface of the activated aluminum foil against the pin of the electronic component to form a preliminary electrical connection;

[0109] Based on the use of ultrasonic welding technology, the aluminum foil core material and the electronic component after the preliminary electrical connection are electrically welded to form a stable electrical connection;

[0110] Pressing the aluminum foil core material and the electronic components to form a stable electrical connection, and assembling the pressed aluminum foil core material and the electronic components into a housing;

[0111] The shell is sealed with epoxy resin to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor.

[0112] In the above embodiment, the end faces of the aluminum foil core material are activated through plasma treatment. This process changes the microstructure of the aluminum foil surface, increasing surface roughness and active sites, thereby raising its surface energy. The high surface energy of the aluminum foil end faces allows for better physical and chemical bonding with the pins of the electronic component, enhancing the reliability and stability of the connection. The activated aluminum foil end faces are then butted against the pins of the electronic component to establish a preliminary electrical connection. Subsequently, ultrasonic welding technology is used to generate energy through high-frequency vibrations, forming a metallurgical bond between the aluminum foil core material and the electronic component. This bond not only provides high strength but also excellent electrical conductivity, ensuring the electrical stability of the capacitor during operation. After electrical welding, the aluminum foil core material and the electronic component are pressed together to further strengthen the mechanical connection and improve the overall structural strength of the capacitor. Next, the pressed aluminum foil core material and the electronic component are assembled into a housing, providing the necessary mechanical support and electrical insulation for the capacitor. Finally, the housing is sealed with epoxy resin. Epoxy resin has excellent insulation and bonding properties, which can effectively prevent moisture, dust and other impurities in the external environment from entering the capacitor. It can also fix internal components and prevent structural loosening caused by vibration or impact, thereby obtaining a packaged chip solid-liquid hybrid aluminum electrolytic capacitor.

[0113] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor, characterized in that: The method comprises: Performing microstructure electrolysis treatment on the aluminum foil core material to form a microporous distribution structure on the surface of the aluminum foil to obtain a pretreated aluminum foil; providing a dispersion based on the surface porosity of the pretreated aluminum foil, wherein the concentration of the dispersion matches the porosity of the microporous distribution structure; Immersing the pretreated aluminum foil in the dispersion for 580 to 620 seconds to form a solid-liquid mixed layer on the surface of the pretreated aluminum foil; Drying the solid-liquid mixed layer by a gradient cooling method to obtain a dried aluminum foil core material, and adjusting the concentration of the dispersion liquid based on the surface curing degree of the dried aluminum foil core material; Immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration for 250 to 300 seconds to obtain a cured aluminum foil core material; Electrically connecting and sealing the cured aluminum foil core material with the electronic components and the housing to obtain a packaged SMD solid-liquid hybrid aluminum electrolytic capacitor; The step of adjusting the concentration of the dispersion based on the surface curing degree of the dried aluminum foil core material comprises: Obtaining a surface spectrum of the dried aluminum foil core material using an infrared spectrometer, setting the spectrum to cover a wavenumber range of 500-400 cm⁻¹, and obtaining absorption peaks at each wavelength band on the surface; Fitting the absorption peaks of each wavelength band according to the peak positions of the surface spectrum to obtain the integrated areas of the surface absorption peaks; calculating a solidification degree of the solid-liquid mixed layer based on the integrated area, and determining whether a concentration of the dispersion reaches a threshold value according to the solidification degree; If yes, the current concentration of the dispersion is maintained; if no, the ratio of the nano-scale conductive particles and the electrolyte in the dispersion is adjusted according to the difference between the curing degree and the threshold value until the desired concentration threshold is reached; Wherein, the calculation expression of the curing degree is: ,in is the degree of curing, is the integrated area of the i-th absorption peak, is the correction factor for the absorption peak, is the wavelength position of the i-th absorption peak, N is the total number of absorption peaks, α is the rate constant of the curing reaction, T is the temperature of the curing reaction, Describe the effects of temperature and time on the degree of cure during the curing reaction.

2. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The dispersion is a mixed solution containing nanoscale conductive particles and an electrolyte, wherein the nanoscale conductive particles are uniformly dispersed in the electrolyte, the particle size of the nanoscale conductive particles ranges from 80 to 100 nanometers, the solvent of the electrolyte is an organic solvent, and the organic solvent is at least one of ethylene glycol, propylene glycol, butanediol, or pentanediol, and the electrolyte is at least one of a quaternary ammonium salt, a quaternary phosphonium salt, or an imidazole salt.

3. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The step of performing microstructure electrolysis treatment on the aluminum foil core material to form a microporous distribution structure on the surface of the aluminum foil to obtain the pretreated aluminum foil includes: Electrolyzing the surface of the aluminum foil core material with an electrolyte, controlling the electrolysis current density to be 10-30 A / dm², and making the surface porosity of the aluminum foil core material 35-40%, thereby obtaining a microstructured aluminum foil; Acquiring a surface state of the microstructured aluminum foil, adjusting a metal ion concentration of the electrolyte according to the surface state, and performing a secondary electrolysis treatment on the microstructured aluminum foil based on the adjusted electrolyte; The microstructured aluminum foil after the secondary electrolysis treatment is cooled, and the cooling rate is controlled to be 0.8-1°C per second, so that the diameter of the micropores is 1-1.2 microns, thereby obtaining the pretreated aluminum foil.

4. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The step of providing a dispersion based on the surface porosity of the pretreated aluminum foil, wherein the concentration of the dispersion matches the porosity of the microporous distribution structure, comprises: Calculating the required particle concentration of the dispersion according to the porosity of the microporous distribution structure to obtain a dispersion concentration range suitable for the porosity; Measuring the particle size of the initial dispersion, and adjusting the proportion of additives to the initial dispersion according to the particle size so that the particle size of the initial dispersion conforms to the dispersion concentration range; The particle sedimentation of the initial dispersion after adjusting the additive ratio in different time periods is tested, and the pH value of the dispersion is adjusted according to the test results to obtain the dispersion.

5. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The step of immersing the pretreated aluminum foil in the dispersion for 580 to 620 seconds to form a solid-liquid mixed layer on the surface of the pretreated aluminum foil comprises: The dispersion is heated at a temperature of 90-100° C. Placing the pretreated aluminum foil in the dispersion, setting the initial immersion depth to 50% of the thickness of the aluminum foil, and obtaining surface tension data of the dispersion; According to the surface tension data of the dispersion, gradually increase the immersion depth to 100% of the thickness of the aluminum foil, so that the pretreated aluminum foil is completely immersed in the dispersion and maintain it for 580-620 seconds; A mechanical stirring device is used to apply uniform micro-oscillation to the dispersion liquid, with a frequency set at 1-5 Hz, so that a solid-liquid mixed layer is generated on the surface of the pretreated aluminum foil.

6. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The step of drying the solid-liquid mixed layer by a gradient cooling method to obtain a dried aluminum foil core material comprises: The solid-liquid mixed layer is heated to 90-100° C. and maintained at this temperature for 5 minutes to obtain a preliminarily solidified mixed layer; Obtaining thickness data of the preliminary solidified mixed layer, and calculating the heat conduction rate of the thickness data during the gradient cooling process based on a conduction equation to obtain a cooling rate; The preliminary solidified mixed layer is cooled according to the cooling rate for 10 minutes until the temperature drops to room temperature, thereby obtaining the dried aluminum foil core material.

7. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The step of immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration for 250 to 300 seconds to obtain a solidified aluminum foil core material comprises: Immersing the dried aluminum foil core material in the dispersion liquid with adjusted concentration, and measuring the flow rate information of the dispersion liquid using a flow meter; Adjusting the circulation rate of the dispersion according to the flow rate information so that the dispersion is evenly covered on the surface of the dried aluminum foil core material; The immersion temperature is controlled to be 60-70° C. so that the nano-scale conductive particles and electrolyte components in the dispersion can effectively penetrate into the microporous structure of the dried aluminum foil core material; The dispersion is subjected to low-frequency vibration treatment using an ultrasonic device, with the frequency set at 20-30 kHz and the immersion time maintained at 250-300 seconds; After the soaking is completed, the dried aluminum foil core material is taken out from the dispersion liquid and naturally cooled to room temperature to obtain the solidified aluminum foil core material.

8. The method for preparing a surface-mount solid-liquid hybrid aluminum electrolytic capacitor according to claim 1, wherein: The step of electrically connecting and sealing the cured aluminum foil core material with the electronic component and the housing to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor comprises: The end surface of the aluminum foil core material is activated by plasma treatment to form a microstructure with high surface energy on its surface, thereby obtaining an activated aluminum foil end surface; butting the end surface of the activated aluminum foil against the pin of the electronic component to form a preliminary electrical connection; Based on the use of ultrasonic welding technology, the aluminum foil core material and the electronic component after the preliminary electrical connection are electrically welded to form a stable electrical connection; Pressing the aluminum foil core material and the electronic components to form a stable electrical connection, and assembling the pressed aluminum foil core material and the electronic components into a housing; The shell is sealed with epoxy resin to obtain a packaged chip-type solid-liquid hybrid aluminum electrolytic capacitor.

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