Preparation method of capacitor shell

Abstract

The invention relates to the related technical field of capacitor production, in particular to a preparation method of a capacitor shell, which comprises the steps of material selection and preparation, mold design and manufacture, shell forming process, quality detection and test, shell surface treatment and protection, shell assembly and welding, and final detection and quality guarantee of the shell. According to the preparation method of the capacitor shell, multiple key links are covered, various materials are selected, aluminum alloy, stainless steel, plastic and the like are matched with different scenes, the purity is strictly controlled and treated to enhance the performance, the mold design is reasonable, the material selection is proper, the machining precision is high, a cooling system optimizes the forming quality, and the forming process is rich; parameters are controlled to guarantee precision, quality is guaranteed through comprehensive detection, performance and attractiveness are improved through surface treatment, multiple modes are adopted for assembly, automation and manual work are combined, structural stability and good sealing are guaranteed, all links synergistically improve the comprehensive performance of the shell, and production quality and efficiency are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor production, and particularly to a preparation method for a capacitor housing Background Art

[0002] The preparation of a capacitor housing is a comprehensive and rigorous process. In the material selection stage, depending on different application scenarios and performance requirements, materials such as aluminum alloy, stainless steel, plastic, or composite materials are selected. The material purity is controlled, and pretreatment and modification are carried out to lay a reliable foundation for the housing. In the mold design and processing link, through scientific design, reasonable material selection, and high-precision processing, the forming quality and production efficiency of the housing are ensured. In the forming process, various methods such as injection molding, die casting, stamping, and stretching are used to meet the production of housings with different materials and shapes. At the same time, the forming parameters are strictly controlled and post-processing trimming is carried out. Comprehensive quality inspection runs through the whole process, covering various tests such as appearance, dimensions, strength, electrical performance, and environmental adaptability to ensure the quality of the housing. The surface treatment process further improves the protection performance and aesthetics of the housing. The assembly process uses various methods to ensure stable structure and good sealing, and the quality and efficiency of assembly are guaranteed through the cooperation of automation and manual work. Every step of the entire preparation process is closely linked and indispensable. Its core meaning is to manufacture a capacitor housing with excellent performance, reliable quality, and meeting the requirements of various usage scenarios through a series of scientific and precise processes, providing a solid guarantee for the stable operation, long-term use, and wide application of capacitors, and promoting the capacitor industry to play an important role in different fields. Therefore, a preparation method for a capacitor housing is needed

[0003] Summary of the Invention

[0004] The present invention provides a preparation method for a capacitor housing, including material selection and preparation, mold design and manufacturing, housing forming process, quality inspection and testing, housing surface treatment and protection, housing assembly and welding, and final inspection and quality assurance of the housing

[0005] Preferably, the material selection and preparation includes housing material selection, material purity requirements, material surface pretreatment, material modification treatment, and material performance testing. The steps of the material selection and preparation first perform housing material selection. After the step of housing material selection is completed, the material purity requirements start. After the material purity requirements are completed, material surface pretreatment is carried out. After the material surface pretreatment is completed, material modification treatment starts. After the material modification treatment is completed, material performance testing can be carried out

[0006] Preferably, the mold design and manufacturing include mold design scheme, mold material selection, mold processing technology, mold cooling system design, and mold inspection and debugging. The mold design and manufacturing first start with the mold design scheme. After the mold design scheme is completed, mold material selection can be started. After the mold material is selected, mold processing technology can be carried out. After the steps of the mold processing technology are completed, mold cooling system design can be carried out. After the mold cooling system design is completed, mold inspection and debugging can be carried out.

[0007] Preferably, the shell forming process includes injection molding, die casting, stamping and stretching, forming accuracy and control, and post-processing and trimming. The steps of the shell forming process include injection molding. After the injection molding is completed, die casting is used. After the die casting is completed, stamping and stretching can be carried out. After the stamping and stretching are completed, forming accuracy and control can be carried out. After the forming accuracy and control are completed, post-processing and trimming can be carried out.

[0008] Preferably, the quality inspection and testing include appearance inspection, dimensional inspection, strength testing, electrical performance testing, and environmental adaptability testing. First, appearance inspection should be carried out in the quality inspection and testing. After the appearance inspection is completed, dimensional inspection can be carried out. After the dimensional inspection is completed, strength testing can be carried out. After the strength testing is completed, electrical performance testing can be carried out. After the electrical performance testing is completed, environmental adaptability testing can be carried out.

[0009] Preferably, the shell surface treatment and protection include electroplating treatment, anodic oxidation treatment, spraying treatment, laser etching and engraving, and protective coating treatment. Electroplating treatment should be carried out on the shell surface treatment and protection. After the electroplating treatment is completed, anodic oxidation treatment can be carried out. After the anodic oxidation treatment is completed, spraying treatment can be carried out. After the spraying treatment is completed, laser etching and engraving can be carried out. After the laser etching and engraving are completed, protective coating treatment can be carried out.

[0010] Preferably, the shell assembly and welding include assembly process selection, welding process selection, sealing process, automated assembly and manual cooperation, and assembly quality inspection. Assembly process selection should be carried out in the shell assembly and welding. After the assembly process selection is completed, welding process selection can be carried out. After the welding process selection is completed, the sealing process can be carried out. After the sealing process is completed, automated assembly and manual cooperation can be carried out. After the automated assembly and manual cooperation are realized, assembly quality inspection can be carried out.

[0011] Preferably, the final inspection and quality assurance of the housing include appearance and surface quality inspection, functional testing, environmental adaptability testing, long-term reliability testing, and final quality acceptance and identification. The final inspection and quality assurance of the housing shall first conduct appearance and surface quality inspection. After the appearance and surface quality inspection, functional testing shall be carried out. After the functional testing, environmental adaptability testing can be conducted. After the environmental adaptability testing is completed, long-term reliability testing can be carried out. After the long-term reliability testing, the final quality acceptance and identification can be carried out.

[0012] The beneficial effects of the present invention are as follows: The preparation method of the capacitor housing covers multiple key aspects including material selection, mold design, forming process, quality inspection, surface treatment, and assembly. Each aspect is closely coordinated, jointly bringing significant benefits to improving the comprehensive performance of the capacitor housing, ensuring production quality and efficiency. In terms of material selection, various materials such as aluminum alloy, stainless steel, plastic, and composite materials meet different application scenarios. Aluminum alloy, with its excellent thermal conductivity, corrosion resistance, and light weight, fits the requirements of most conventional capacitors, contributing to efficient heat dissipation and reducing the weight of the equipment. The high temperature and corrosion resistance of stainless steel make it a reliable choice in extreme environments. Plastic, with its low cost and good electrical insulation, meets the requirements of cost-sensitive products. Strictly control the material purity. For metal materials, avoid oxides and impurities interfering with mechanical strength and corrosion resistance. For plastic materials, ensure they are non-toxic and free of volatile harmful substances to maintain electrical performance and long-term stability. Material surface pretreatment and modification further enhance the performance. The metal housing undergoes pickling and polishing to improve the coating adhesion. The plastic housing undergoes sandblasting and polishing to improve the appearance and protection. In special applications, the metal housing undergoes anodic oxidation and electroplating, and the plastic housing adds anti-ultraviolet and antioxidant additives to meet the special requirements of complex working conditions for mechanical strength, corrosion resistance, and high temperature stability. The mold design fully considers the housing shape, wall thickness uniformity, and adaptability to the production process, ensuring the consistency of products in different batches, reducing the defective rate, and improving production efficiency and quality stability. Select suitable mold materials such as high-strength alloy steel and aluminum alloy to withstand high temperature and pressure, extend the mold service life, reduce the replacement frequency, and lower production costs. High-precision processing techniques such as milling, laser cutting, and grinding ensure the mold accuracy, avoiding housing quality problems. Fine machining of the mold mating surface and cooling system ensures the stable operation of the mold. The carefully designed cooling system effectively controls the mold temperature, preventing housing deformation during molding, and improving the molding quality and production efficiency. The forming process provides multiple options. Injection molding is suitable for mass production of high-precision and high-efficiency plastic housings, manufacturing housings with complex shapes and consistent dimensions. Die casting can quickly and accurately produce large quantities of metal housings, especially suitable for aluminum alloy and zinc alloy. Stamping and stretching forming processes are simple and efficient, meeting the production of metal housings with different shapes. During the forming process, strictly control parameters such as temperature, pressure, and cooling time to ensure the dimensional accuracy and surface quality of the housing, making it perfectly adapted to the internal components. Post-processing and trimming eliminate forming defects through deburring, polishing, drilling, etc., facilitating assembly, and improving the corrosion resistance and aesthetics by treating the surface finish. A comprehensive quality inspection system is the key to quality assurance. Visual inspection promptly discovers surface defects, avoiding affecting mechanical strength and sealing. Dimensional inspection ensures compliance with design specifications, guaranteeing assembly quality. Strength testing verifies durability, ensuring it can withstand external forces. Electrical performance testing ensures electrical insulation, preventing current leakage and electrical failures.Environmental adaptability tests simulate different environments to detect weather resistance, corrosion resistance, and anti-ultraviolet aging ability. The surface treatment process significantly improves the performance and aesthetics of the housing. Electroplating treatment enhances the corrosion resistance and aesthetics of the metal housing. Precise control of electroplating parameters ensures a uniform coating with strong adhesion, extending the service life. Anodizing treatment forms a strong alumina film on the aluminum alloy housing, improving corrosion resistance, hardness, and wear resistance, and providing a variety of color options. Spraying treatment provides additional corrosion resistance and aesthetic effects for the housing. Common spraying materials have good weather resistance and chemical resistance. Laser etching and engraving precisely etch information with high precision and no pollution. Protective coating treatment provides effective protection for the metal housing in extreme environments, extending the service life. The assembly process uses various methods such as mechanical latches, snap connections, screw fixation, and welding to ensure structural stability and sealing. Diversified welding processes meet the welding requirements of different housings. The sealing process uses silicone, rubber gaskets, etc. to prevent foreign substances from entering. Automated assembly combined with manual work improves production efficiency, ensuring complex assembly accuracy and product quality. Assembly quality inspection uses various methods to promptly detect and repair quality problems, ensuring the actual use performance. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0014] Figure 2 It is a schematic diagram of the material selection and preparation process of the present invention;

[0015] Figure 3 It is a schematic diagram of the mold design and manufacturing process of the present invention;

[0016] Figure 4 It is a schematic diagram of the housing forming process of the present invention;

[0017] Figure 5 It is a schematic diagram of the quality inspection and testing process of the present invention;

[0018] Figure 6 It is a schematic diagram of the housing surface treatment and protection process of the present invention;

[0019] Figure 7 It is a schematic diagram of the housing assembly and welding process of the present invention;

[0020] Figure 8 It is a schematic diagram of the final inspection and quality assurance process of the housing of the present invention.

[0021] In the figure: S, preparation method; S1, material selection and preparation; S101, selection of housing material; S102, material purity requirement; S103, surface pretreatment of material; S104, material modification treatment; S105, material performance testing; S2, mold design and manufacturing; S201, mold design scheme; S202, mold material selection; S203, mold processing technology; S204, mold cooling system design; S205, mold inspection and debugging; S3, housing forming process; S301, injection molding; S302, die casting; S303, stamping and stretching forming; S304, forming accuracy and control; S305, post-processing and trimming; S4, quality inspection and testing; S401, appearance inspection; S402, dimensional inspection; S403, strength testing; S404, electrical performance testing; S405, environmental adaptability testing; S5, housing surface treatment and protection; S501, electroplating treatment; S502, anodic oxidation treatment; S503, spraying treatment; S504, laser etching and engraving; S505, protective coating treatment; S6, housing assembly and welding; S601, selection of assembly process; S602, selection of welding process; S603, sealing process; S604, automated assembly and manual cooperation; S605, assembly quality inspection; S7, final inspection and quality assurance of housing; S701, appearance and surface quality inspection; S702, functional testing; S703, environmental adaptability testing; S704, long-term reliability testing; S705, final quality acceptance and identification. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figure 1-8 , the present invention provides a preparation method for a capacitor housing: the preparation method for the capacitor housing includes the preparation method S, including material selection and preparation S1, mold design and manufacturing S2, housing forming process S3, quality inspection and testing S4, housing surface treatment and protection S5, housing assembly and welding S6, and final inspection and quality assurance S7 of the housing.

[0024] Furthermore, the material selection and preparation S1 includes the housing material selection S101, material purity requirement S102, material surface pretreatment S103, material modification treatment S104, and material performance testing S105. The steps of material selection and preparation S1 are preferably carried out with the housing material selection S101 first. After the step of housing material selection S101 is completed, the material purity requirement S102 starts. After the material purity requirement S102 is completed, the material surface pretreatment S103 is carried out. After the material surface pretreatment S103 is completed, the material modification treatment S104 starts. After the material modification treatment S104 is completed, the material performance testing S105 can be carried out. Through the settings of the housing material selection S101, material purity requirement S102, material surface pretreatment S103, material modification treatment S104, and material performance testing S105, the use effect is better. First, the housing material selection S101 is crucial for the performance of the capacitor. Commonly used materials include aluminum alloy, stainless steel, plastic, and composite materials. Aluminum alloy has excellent thermal conductivity, corrosion resistance, and a relatively light mass, and is very suitable for most capacitor applications. Stainless steel materials are resistant to high temperatures and corrosion, and are suitable for applications in extreme environments. Plastics are often used in low-cost products and have good electrical insulation properties. Then, for the material purity requirement S102, the selected materials should have high purity to ensure the reliability of the capacitor housing. Metal materials should avoid the interference of oxides and impurities, especially those that affect mechanical strength and corrosion resistance. The selection of plastic materials needs to ensure non-toxicity and no volatile harmful substances to avoid affecting the electrical performance and long-term stability of the housing. Next, the material surface pretreatment S103 is a key step to ensure the quality of housing forming and subsequent processing. For metal housings, the surface needs to remove impurities such as oil stains and rust, and is cleaned by pickling, mechanical grinding, etc. to improve the adhesion of coatings or adhesives. For plastic housings, the surface can be sandblasted, ground, etc. to enhance its adhesion to the coating. Then, for the material modification treatment S104, some special applications require the housing to have stronger mechanical strength, corrosion resistance, or high-temperature stability. To meet these requirements, modification methods such as reinforcing fibers and fillers can be used to enhance the performance of the material. For metal housings, the surface hardness and corrosion resistance are often improved by anodizing, electroplating, etc. For plastic housings, additives with anti-ultraviolet and antioxidant properties can be added. Finally, for the material performance testing S105, after the material selection is completed, its performance needs to be tested to ensure that it meets the design requirements. The test contents include tensile strength, high-temperature resistance, corrosion resistance, electrical insulation, etc. Through the comprehensive testing of the material, it is ensured that it meets the production process requirements and can operate stably for a long time.

[0025] Furthermore, mold design and manufacturing S2 includes a mold design plan S201, mold material selection S202, mold processing technology S203, mold cooling system design S204, and mold inspection and debugging S205. For mold design and manufacturing S2, the mold design plan S201 is carried out first. After the mold design plan S201 is completed, the mold material selection S202 can be started. After the mold material selection S202 is completed, the mold processing technology S203 can be carried out. After the steps of the mold processing technology S203 are completed, the mold cooling system design S204 can be carried out. After the mold cooling system design S204 is completed, the mold inspection and debugging S205 can be carried out. Through the settings of the mold design plan S201, mold material selection S202, mold processing technology S203, mold cooling system design S204, and mold inspection and debugging S205, the usage effect is better. First, the mold design plan S201 is carried out. The mold design is the core of the shell molding quality. When designing, the complex shape of the shell, wall thickness uniformity, and adaptability to injection molding, die casting, or stamping processes need to be considered. The design plan should ensure that the mold can maintain consistency in different production batches and have good production efficiency. Then, the mold material selection S202 directly affects the durability and processing accuracy of the mold. Commonly used mold materials include high-strength alloy steel, aluminum alloy, etc. According to the material of the shell and the requirements of the production process, the appropriate mold material is selected to ensure that the mold can withstand high temperature, pressure, and have a long service life. Then, the mold processing technology S203 includes milling, laser cutting, grinding, etc. The specific process depends on the complexity of the shell design. High-precision processing technology can ensure the accuracy of the mold and avoid quality problems of the shell products caused by mold defects. Especially the mating surfaces and cooling systems of the mold need to be finely processed to ensure the stability and good working performance of the mold. Next, the mold cooling system design S204 is carried out. The mold cooling system is crucial for improving production efficiency and ensuring molding quality. Uneven mold cooling will cause uneven temperature during shell molding, which will in turn cause shell deformation. By designing reasonable cooling channels, the mold temperature can be effectively controlled to ensure uniform shell molding. Next, the mold inspection and debugging S205 is carried out. After the mold processing is completed, a comprehensive inspection and debugging are required. Through trial molding, the dimensional accuracy, molding effect, and surface quality of the mold are verified. During the debugging process, when any problems are found, adjustments need to be made to ensure the accuracy and stability of the mold, and ultimately ensure high quality during mass production.

[0026] Furthermore, the outer shell forming process S3 includes injection molding S301, die casting S302, stamping and stretching forming S303, forming precision and control S304, and post-processing and trimming S305. The steps of the outer shell forming process S3 include injection molding S301. After the injection molding S301 is completed, die casting S302 is used. After die casting S302 is formed, stamping and stretching forming S303 can be carried out. After stamping and stretching forming S303 is completed, forming precision and control S304 can be carried out. After the forming precision and control S304 is completed, post-processing and trimming S305 can be carried out. Through the settings of injection molding S301, die casting S302, stamping and stretching forming S303, forming precision and control S304, and post-processing and trimming S305, the usage effect is better. First, injection molding S301 is a common plastic shell production process. The plastic material is heated to a molten state and injected into the mold under high pressure. After cooling, it is formed. This process is suitable for high-precision and high-efficiency mass production and can produce shells with complex shapes and consistent dimensions. Then, die casting S302 is widely used in the production of metal shells. The metal material is heated to a molten state, and the molten metal is injected into the mold under high pressure. After cooling, the shell is obtained. The die casting process can quickly and accurately produce a large number of metal shells and is suitable for the production of metals such as aluminum alloy and zinc alloy. Next, stamping and stretching forming S303 is a process commonly used for metal shells. The stamping process is suitable for producing flat or shallow-drawn shells, and the stretching process is suitable for producing shells with deep cavities. Through the design of the mold, the metal material can be precisely shaped into the required shape. The process is simple and the production efficiency is high. Next, forming precision and control S304. During the forming process, it is very important to control the dimensional accuracy and surface quality of the shell. It is necessary to strictly control parameters such as forming temperature, pressure, and cooling time to ensure the geometric shape and surface smoothness of the shell. Precision control is directly related to the compatibility of the shell with internal components and the quality of the product. Then, post-processing and trimming S305. The formed shell may have problems such as burrs and defects and needs post-processing. Common post-processing includes operations such as deburring, grinding, and drilling to ensure that the shell meets the design requirements and facilitates subsequent assembly. At the same time, special attention should be paid to the treatment of surface finish to improve the corrosion resistance and aesthetics of the shell.

[0027] Furthermore, the quality inspection and testing S4 includes appearance inspection S401, dimensional inspection S402, strength test S403, electrical performance test S404, and environmental adaptability test S405. For the quality inspection and testing S4, the appearance inspection S401 should be carried out first. After the appearance inspection S401 is completed, the dimensional inspection S402 can be carried out. After the dimensional inspection S402 is completed, the strength test S403 can be carried out. After the strength test S403 is completed, the electrical performance test S404 can be carried out. After the electrical performance test S404 is completed, the environmental adaptability test S405 can be carried out. Through the settings of the appearance inspection S401, dimensional inspection S402, strength test S403, electrical performance test S404, and environmental adaptability test S405, in terms of the usage effect, first carrying out the appearance inspection S401 is an important link to ensure the qualification of the capacitor housing. The inspection content includes whether there are defects such as cracks, bubbles, and scratches on the surface. These defects not only affect the appearance but may also affect the mechanical strength and sealing performance of the capacitor. Through manual or automated appearance inspection, problems can be discovered and solved in a timely manner. Then, for the dimensional inspection S402, the dimensional accuracy of the housing directly affects the assembly quality of the capacitor. Precision tools such as coordinate measuring machines and calipers are used to measure the dimensions of the housing to ensure that they meet the design specifications. Housings with unqualified dimensions need to be reworked or scrapped to ensure the quality of the capacitor. Then, the strength test S403 is used. The mechanical strength of the housing is the basis for ensuring the durability and safety of the capacitor. Common strength tests include tensile strength, compressive strength, impact resistance tests, etc. Through these tests, the durability of the housing during long-term use is verified to ensure that it can withstand the external forces during normal use. Continuing with the electrical performance test S404, the capacitor housing needs to have good electrical insulation to prevent current leakage or electrical failures. Therefore, it is necessary to carry out electrical performance tests on the housing, including withstand voltage tests, insulation resistance tests, etc., to ensure sufficient safety of the housing during the operation of the capacitor. Finally, the environmental adaptability test S405 is used. The capacitor housing needs to work stably under different environmental conditions. The environmental adaptability test includes high and low temperature tests, humidity tests, ultraviolet aging, etc. By simulating different environments, the weather resistance, corrosion resistance, and ultraviolet aging resistance of the housing are detected to ensure that it can be used for a long time in various environments.

[0028] Furthermore, the shell surface treatment and protection S5 includes electroplating treatment S501, anodizing treatment S502, spraying treatment S503, laser etching and engraving S504, and protective coating treatment S505. For the shell surface treatment and protection S5, electroplating treatment S501 is to be carried out. After the electroplating treatment S501 is completed, anodizing treatment S502 can be carried out. After the anodizing treatment S502 is completed, spraying treatment S503 can be carried out. After the spraying treatment S503 is completed, laser etching and engraving S504 can be carried out. After the laser etching and engraving S504 is completed, protective coating treatment S505 can be carried out. Through the settings of electroplating treatment S501, anodizing treatment S502, spraying treatment S503, laser etching and engraving S504, and protective coating treatment S505, the usage effect is better. First, electroplating treatment S501 is carried out. Electroplating treatment is widely used in the surface protection of metal shells, especially in enhancing its corrosion resistance and aesthetics. Commonly used electroplating materials include zinc plating, nickel plating, chromium plating, etc. The electroplating process can not only enhance the oxidation resistance of the shell, but also improve its surface hardness and increase the durability of the shell. By precisely controlling the electroplating time and current density, it is ensured that the electroplated layer is uniform and has strong adhesion, thereby improving the service life of the shell. Then, anodizing treatment S502 is used, which is usually used for aluminum alloy shells and can form a strong aluminum oxide film, thereby improving the corrosion resistance, hardness, and wear resistance of the shell. This treatment can not only increase the durability of the shell, but also improve the appearance. Usually, it can provide a variety of color options for the shell. The thickness of the anodizing film can be adjusted according to requirements to meet the usage needs in different environments. Then, spraying treatment S503 is commonly used for the surface modification of plastic shells or metal shells and can provide additional corrosion resistance and aesthetic effects. Common spraying materials include polyester, fluorocarbon coatings, etc. These coatings have good weather resistance and chemical resistance and can effectively prevent the surface of the shell from oxidation, corrosion, or fading. Through the spraying process, the surface of the shell can be smoother, improving the visual effect. Then, laser etching and engraving S504 is a fine surface treatment process suitable for etching information such as company logos, models, and technical parameters on the shell surface. This method has the advantages of high precision and no pollution and can deeply engrave on different materials to ensure that the engraved information is clear and durable. The laser process does not generate mechanical stress and avoids deformation that may be caused by traditional engraving processes. Finally, protective coating treatment S505 is used. The protective coating is a special coating for preventing the shell from being damaged in extreme environments and is usually used for metal shells. Common protective coatings include polyurethane, epoxy resin, etc. It can effectively resist chemical corrosion, ultraviolet radiation, and moisture erosion. By applying the protective coating, the service life of the shell can be greatly extended, especially in high-humidity, high-temperature, or chemically corrosive environments.

[0029] Further, the housing assembly and welding S6 includes the selection of assembly process S601, the selection of welding process S602, the sealing process S603, the automated assembly and manual cooperation S604, and the assembly quality inspection S605. For the housing assembly and welding S6, the selection of assembly process S601 needs to be carried out. After the selection of assembly process S601 is completed, the selection of welding process S602 can be carried out. After the selection of welding process S602 is completed, the sealing process S603 can be carried out. After the sealing process S603 is completed, the automated assembly and manual cooperation S604 can be carried out. After the automated assembly and manual cooperation S604 is realized, the assembly quality inspection S605 can be carried out. Through the settings of the selection of assembly process S601, the selection of welding process S602, the sealing process S603, the automated assembly and manual cooperation S604, and the assembly quality inspection S605, the usage effect is better. First, the selection of assembly process S601: The assembly process of the capacitor housing directly affects the structural stability and sealing performance of the housing. Common assembly processes include mechanical locking, snap connection, screw fixation, etc. For certain types of housings, welding processes may be adopted to ensure firm connection and strong sealing performance. According to the design requirements of the capacitor, the appropriate assembly method is selected. Then, the selection of welding process S602: The welding process is crucial for the assembly of the metal housing. Common welding methods include TIG welding, MIG welding, and laser welding, etc. TIG welding is suitable for precision and thin-walled housings, and can provide good welding strength and aesthetics; MIG welding is suitable for larger-sized housings with higher welding efficiency; laser welding is suitable for fields with high-precision requirements, with smooth welds and small heat-affected zones. Then, the sealing process S603: It is an important step to ensure that the capacitor housing can effectively prevent the entry of external moisture, dust and other substances. Commonly used sealing materials include silicone rubber, rubber gaskets, etc. These materials have good elasticity, high temperature resistance and waterproof performance. During the assembly process, by precisely controlling the installation position and pressure of the sealing ring, the sealing effect is ensured. Next, the automated assembly and manual cooperation S604: With the improvement of production efficiency, automated assembly has gradually become the main means of capacitor housing assembly. Automated assembly can greatly improve production efficiency and reduce errors caused by manual operations. However, in some complex assembly processes, manual intervention and inspection are still required to ensure the accuracy of each link and the product quality. Finally, the assembly quality inspection S605: After the assembly is completed, strict quality inspection must be carried out to ensure that the housing assembly is firm, airtight, and free of defects such as misalignment. Common inspection methods include airtightness test, watertightness test, visual inspection, etc. Through these inspections, quality problems that may occur during the assembly process can be detected and repaired in a timely manner to ensure that the capacitor housing can maintain efficient and safe performance during actual use.

[0030] Furthermore, the final inspection and quality assurance S7 of the housing includes appearance and surface quality inspection S701, functional testing S702, environmental adaptability testing S703, long-term reliability testing S704, and final quality acceptance and identification S705. For the final inspection and quality assurance S7 of the housing, the appearance and surface quality inspection S701 should be carried out first. After the appearance and surface quality inspection S701, the functional testing S702 should be carried out. After the functional testing S702, the environmental adaptability testing S703 can be carried out. After the environmental adaptability testing S703 is completed, the long-term reliability testing S704 can be carried out. After the long-term reliability testing S704, the final quality acceptance and identification S705 can be carried out. Through the settings of the appearance and surface quality inspection S701, functional testing S702, environmental adaptability testing S703, long-term reliability testing S70, and final quality acceptance and identification S705, the usage effect is better. First, the appearance and surface quality inspection S701 is the last quality inspection link in the production process of the capacitor housing. The inspection content includes whether there are defects such as scratches, cracks, and bubbles on the housing surface. The housing with poor appearance quality should be repaired or scrapped in time to ensure that the appearance of the capacitor in the final delivery meets the standards and does not affect its functionality and performance. Then, the functional testing S702 of the housing is an important link to ensure the normal operation of the capacitor. The main test items include waterproof, dustproof, seismic resistance, etc. Through strict functional testing, it is ensured that the housing can effectively protect the internal components of the capacitor and avoid the influence of external environmental factors on the capacitor performance. Then, the environmental adaptability testing S703 is carried out. The capacitor housing needs to work stably in different environments for a long time, so the environmental adaptability testing must be carried out. Common tests include high and low temperature alternation, humidity testing, ultraviolet aging, etc. By simulating extreme environments, the durability and stability of the housing under high temperature, high humidity, low temperature and other conditions are verified. Then, the long-term reliability testing S704 is carried out. In order to ensure the stability of the capacitor during long-term use, it is very important to carry out the long-term reliability testing. This test detects the aging resistance and deformation resistance of the housing by simulating the load conditions of the housing during years of use, and ensures that there is no performance decline during the entire service life. Finally, use...

[0031] Working principle: First, the selection of the shell material S101 is crucial for the performance of the capacitor. Commonly used materials include aluminum alloy, stainless steel, plastic, and composite materials. Aluminum alloy has excellent thermal conductivity, corrosion resistance, and a relatively light mass, making it very suitable for most capacitor applications. Stainless steel materials are resistant to high temperatures and corrosion and are suitable for applications in extreme environments. Plastic is often used in low-cost products and has good electrical insulation properties. Then, the material purity requirement S102 is that the selected material should have high purity to ensure the reliability of the capacitor shell. Metal materials should avoid the interference of oxides and impurities, especially those that affect mechanical strength and corrosion resistance. The selection of plastic materials needs to ensure non-toxicity and no volatile harmful substances to avoid affecting the electrical performance and long-term stability of the shell. Next, the surface pretreatment of the material S103 is a key step to ensure the quality of shell forming and post-treatment. For metal shells, the surface needs to remove impurities such as oil stains and rust, and is cleaned by pickling, mechanical grinding, etc. to improve the adhesion of the coating or adhesive. For plastic shells, the surface can be sandblasted, polished, etc. to enhance its adhesion to the coating. Then, the material modification treatment S104 is carried out. Some special applications require the shell to have stronger mechanical strength, corrosion resistance, or high-temperature stability. To meet these requirements, modification methods such as reinforcing fibers and fillers can be used to enhance the performance of the material. For metal shells, surface hardness and corrosion resistance are often improved by anodic oxidation, electroplating, etc. For plastic shells, additives with anti-ultraviolet and anti-oxidation properties can be added. Finally, the material performance test S105 is carried out. After the material selection is completed, its performance needs to be tested to ensure that it meets the design requirements. The test contents include tensile strength, high-temperature resistance, corrosion resistance, electrical insulation, etc. Through comprehensive testing of the material, it is ensured that it meets the production process requirements and can operate stably for a long time. First, the mold design scheme S201 is carried out. Mold design is the core of the shell forming quality. When designing, the complex shape of the shell, wall thickness uniformity, and adaptability to injection molding, die casting, or stamping processes need to be considered. The design scheme should ensure that the mold can maintain consistency in different production batches and have good production efficiency. Then, the mold material selection S202 directly affects the durability and processing accuracy of the mold. Commonly used mold materials include high-strength alloy steel, aluminum alloy, etc. According to the material of the shell and the production process requirements, the appropriate mold material is selected to ensure that the mold can withstand high temperatures, pressures, and has a long service life. Then, the mold processing technology S203 is used, including milling, laser cutting, grinding, etc. The specific process depends on the complexity of the shell design. High-precision processing technology can ensure the accuracy of the mold and avoid quality problems of the shell product caused by mold defects. In particular, the mating surface and cooling system of the mold need to be finely processed to ensure the stability and good working performance of the mold. Next, the mold cooling system design S204 is carried out. The mold cooling system is crucial for improving production efficiency and ensuring the forming quality. Uneven mold cooling will cause uneven temperatures during shell forming.Furthermore, it causes the deformation of the outer shell. By designing reasonable cooling channels, the mold temperature can be effectively controlled to ensure uniform molding of the outer shell. Then, mold inspection and debugging are carried out. After the mold processing is completed, comprehensive inspection and debugging are required. The dimensional accuracy, molding effect, and surface quality of the mold are verified through trial molding. During the debugging process, when any problems are found, adjustments need to be made to ensure the accuracy and stability of the mold, and ultimately ensure high quality during mass production. First, injection molding is carried out. S30 is a commonly used plastic outer shell production process. The plastic material is heated to a molten state and injected into the mold under high pressure. After cooling, it is formed. This process is suitable for high-precision and high-efficiency mass production and can produce outer shells with complex shapes and consistent dimensions. Then, die casting is carried out. S302 is widely used in the production of metal outer shells. The metal material is heated to a molten state, and the molten metal is injected into the mold under high pressure. After cooling, the outer shell is obtained. The die casting process can quickly and accurately produce a large number of metal outer shells and is suitable for the production of metals such as aluminum alloy and zinc alloy. Then, stamping and stretching forming are carried out. S303 is a process commonly used for metal outer shells. The stamping process is suitable for producing flat or shallow stamping outer shells, and the stretching process is suitable for producing outer shells with deep cavities. Through the design of the mold, the metal material can be precisely shaped into the required shape. The process is simple and the production efficiency is high. Then, forming accuracy and control are carried out. S304 During the forming process, it is very important to control the dimensional accuracy and surface quality of the outer shell. It is necessary to strictly control parameters such as forming temperature, pressure, and cooling time to ensure the geometric shape and surface smoothness of the outer shell. Precision control is directly related to the compatibility of the outer shell with internal components and the quality of the product. Then, post-processing and trimming are carried out. S305 After forming, the outer shell may have problems such as burrs and defects and need post-processing. Common post-processing operations include deburring, grinding, drilling, etc. to ensure that the outer shell meets the design requirements and facilitates subsequent assembly. At the same time, special attention needs to be paid to the treatment of surface finish to improve the corrosion resistance and aesthetics of the outer shell. First, appearance inspection is carried out. S401 is an important link to ensure the qualification of the capacitor outer shell. The inspection content includes whether there are defects such as cracks, bubbles, and scratches on the surface. These defects not only affect the appearance but may also affect the mechanical strength and sealing performance of the capacitor. Through manual or automated appearance inspection, problems can be discovered and solved in a timely manner. Then, dimensional inspection is carried out. S402 The dimensional accuracy of the outer shell directly affects the assembly quality of the capacitor. Precision tools such as coordinate measuring machines and calipers are used to measure the dimensions of the outer shell to ensure that it meets the design specifications. Outer shells with unqualified dimensions need to be reworked or scrapped to ensure the quality of the capacitor. Then, strength testing is carried out. S403 The mechanical strength of the outer shell is the basis for ensuring the durability and safety of the capacitor. Common strength tests include tensile strength, compressive strength, impact resistance tests, etc. Through these tests, the durability of the outer shell during long-term use is verified to ensure that it can withstand the external forces during normal use. Then, electrical performance testing is carried out. S404 The capacitor outer shell must have good electrical insulation properties,To prevent current leakage or electrical faults, it is necessary to conduct electrical performance tests on the enclosure, including withstand voltage tests, insulation resistance tests, etc., to ensure that the enclosure has sufficient safety during the operation of the capacitor. Finally, environmental adaptability tests S405 are required. The capacitor enclosure needs to work stably under different environmental conditions. Environmental adaptability tests include high and low temperature tests, humidity tests, ultraviolet aging, etc. By simulating different environments, the weather resistance, corrosion resistance and anti-ultraviolet aging ability of the enclosure are detected to ensure its long-term use in various environments. First, electroplating treatment S501 is carried out. Electroplating treatment is widely used in the surface protection of metal enclosures, especially in enhancing its corrosion resistance and aesthetics. Common electroplating materials include zinc plating, nickel plating, chromium plating, etc. The electroplating process can not only enhance the oxidation resistance of the enclosure, but also improve its surface hardness and increase the durability of the enclosure. By precisely controlling the electroplating time and current density, it is ensured that the electroplating layer is uniform and has strong adhesion, thereby increasing the service life of the enclosure. Then, anodizing treatment S502 is used, which is usually used for aluminum alloy enclosures and can form a strong alumina film, thereby improving the corrosion resistance, hardness and wear resistance of the enclosure. This treatment can not only increase the durability of the enclosure, but also improve its appearance. Usually, it can provide a variety of color options for the enclosure. The thickness of the anodized film can be adjusted according to requirements to meet the usage needs under different environments. Then, spraying treatment S503 is used, which is commonly used for the surface modification of plastic enclosures or metal enclosures and can provide additional corrosion resistance and aesthetics. Common spraying materials include polyester, fluorocarbon coatings, etc. These coatings have good weather resistance and chemical resistance and can effectively prevent the surface of the enclosure from oxidation, corrosion or fading. Through the spraying process, the surface of the enclosure can be smoother, enhancing the visual effect. Then, laser etching and engraving S504 is a fine surface treatment process suitable for etching information such as company logos, models, and technical parameters on the surface of the enclosure. This method has the advantages of high precision and no pollution and can perform deep engraving on different materials to ensure that the engraved information is clear and durable. The laser process does not generate mechanical stress, avoiding deformation that may be caused by traditional engraving processes. Finally, protective coating treatment S505 is used. The protective coating is a coating specially designed to prevent the enclosure from being damaged in extreme environments and is usually used for metal enclosures. Common protective coatings include polyurethane, epoxy resin, etc. and can effectively resist chemical corrosion, ultraviolet radiation and moisture erosion. By applying the protective coating, the service life of the enclosure can be greatly extended, especially in high humidity, high temperature or chemical corrosion environments. First, the assembly process selection S601 is carried out. The assembly process of the capacitor enclosure directly affects the structural stability and sealing performance of the enclosure. Common assembly processes include mechanical latches, snap connections, screw fixation, etc. For certain types of enclosures, welding processes may be used to ensure firm connection and strong sealing. According to the design requirements of the capacitor, the appropriate assembly method is selected, and then the selection of the welding process S602 is carried out. The welding process is crucial for the assembly of metal enclosures.Common welding methods include TIG welding, MIG welding and laser welding. TIG welding is suitable for precise and thin-walled shells, and can provide good welding strength and aesthetics; MIG welding is suitable for larger shells and has higher welding efficiency; laser welding is suitable for fields with high precision requirements, with smooth welds and small heat-affected zones. The use of sealing process S603 is an important step to ensure that the capacitor shell can effectively prevent the entry of external moisture, dust and other substances. Commonly used sealing materials include silicone, rubber gaskets, etc. These materials have good elasticity, high temperature resistance and waterproof performance. During the assembly process, the sealing effect is ensured by precisely controlling the installation position and pressure of the sealing ring, and then using With the improvement of production efficiency, automated assembly has gradually become the main means of assembling capacitor shells. Automated assembly can greatly improve production efficiency and reduce errors caused by manual operation. However, in some complex assembly processes, manual intervention and inspection are still required to ensure the accuracy and product quality of each link. Finally, assembly quality inspection S605 is used. After the assembly is completed, strict quality inspection must be carried out to ensure that the shell is firmly assembled, without air leakage, dislocation and other defects. Common inspection methods include air tightness test, water tightness test, visual inspection, etc. Through these inspections, quality problems that may occur in the assembly process can be discovered and repaired in time to ensure the quality of the capacitor. The container shell can maintain efficient and safe performance in actual use. First, the appearance and surface quality inspection S701 is the last quality inspection link in the production process of the capacitor shell. The inspection content includes whether there are scratches, cracks, bubbles and other defects on the shell surface. The shell with poor appearance quality should be repaired or scrapped in time to ensure that the appearance of the final delivery of the capacitor meets the standards and does not affect its functionality and performance. Then use the functional test S702. The functional test of the shell is an important link to ensure the normal operation of the capacitor. The main test items include waterproof, dustproof, shockproof, etc. Through strict functional testing, it is ensured that the shell can effectively protect the internal components of the capacitor and avoid external environmental factors. The performance of the capacitor is affected, and then the environmental adaptability test S703 is used. The capacitor shell needs to work stably for a long time in different environments, so environmental adaptability testing is necessary. Common tests include high and low temperature alternation, humidity testing, ultraviolet aging, etc. By simulating extreme environments, the durability and stability of the shell under high temperature, high humidity, and low temperature conditions are verified. Then the long-term reliability test S704 is used to ensure the stability of the capacitor during long-term use. It is very important to conduct long-term reliability testing. This test simulates the load conditions of the shell in many years of use to detect the shell's resistance to aging and deformation, ensuring that its performance does not decline throughout the entire use cycle before use.

[0032] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Preparation method of capacitor housing, including preparation method (S), including material selection and preparation (S1), mold design and manufacturing (S2), housing forming process (S3), quality inspection and testing (S4), housing surface treatment and protection (S5), housing assembly and welding (S6), and final inspection and quality assurance of housing (S7).

2. The manufacturing method of the capacitor housing according to claim 1, characterized in that: The material selection and preparation (S1) includes housing material selection (S101), material purity requirement (S102), material surface pretreatment (S103), material modification treatment (S104), and material property testing (S105). The step of housing material selection (S101) is preferentially carried out in the material selection and preparation (S1). After the step of housing material selection (S101) is completed, the material purity requirement (S102) starts. After the material purity requirement (S102) is completed, the material surface pretreatment (S103) is carried out. After the material surface pretreatment (S103) is completed, the material modification treatment (S104) starts. After the material modification treatment (S104) is completed, the material property testing (S105) can be carried out.

3. The preparation method of the capacitor housing according to claim 1, characterized in that: The mold design and manufacturing (S2) includes mold design scheme (S201), mold material selection (S202), mold processing technology (S203), mold cooling system design (S204), and mold inspection and debugging (S205). The mold design and manufacturing (S2) first starts with the mold design scheme (S201). After the mold design scheme (S201) is designed, the mold material selection (S202) can start. After the mold material selection (S202) is selected, the mold processing technology (S203) can be carried out. After the step of mold processing technology (S203) is completed, the mold cooling system design (S204) can be carried out. After the mold cooling system design (S204) is completed, the mold inspection and debugging (S205) can be carried out.

4. The preparation method of the capacitor housing according to claim 1, characterized in that: The housing forming process (S3) includes injection molding (S301), die casting molding (S302), stamping and stretching molding (S303), forming accuracy and control (S304), and post-processing and trimming (S305). The steps of the housing forming process (S3) include injection molding (S301). After the injection molding (S301) is completed, die casting molding (S302) is used. After the die casting molding (S302) is formed, stamping and stretching molding (S303) can be carried out. After the stamping and stretching molding (S303) is completed, the forming accuracy and control (S304) can be carried out. After the forming accuracy and control (S304) is controlled, the post-processing and trimming (S305) can be carried out.

5. The preparation method of the capacitor housing according to claim 1, characterized in that: The quality inspection and testing (S4) includes appearance inspection (S401), dimensional inspection (S402), strength test (S403), electrical performance test (S404), and environmental adaptability test (S405). For the quality inspection and testing (S4), the appearance inspection (S401) shall be carried out first. After the appearance inspection (S401) is completed, the dimensional inspection (S402) can be carried out. After the dimensional inspection (S402) is completed, the strength test (S403) can be carried out. After the strength test (S403) is completed, the electrical performance test (S404) can be carried out. After the electrical performance test (S404) is completed, the environmental adaptability test (S405) can be carried out.

6. The preparation method of the capacitor housing according to claim 1, characterized in that: The housing surface treatment and protection (S5) includes electroplating treatment (S501), anodizing treatment (S502), spraying treatment (S503), laser etching and engraving (S504), and protective coating treatment (S505). For the housing surface treatment and protection (S5), the electroplating treatment (S501) shall be carried out. After the electroplating treatment (S501) is completed, the anodizing treatment (S502) can be carried out. After the anodizing treatment (S502) is completed, the spraying treatment (S503) can be carried out. After the spraying treatment (S503) is completed, the laser etching and engraving (S504) can be carried out. After the laser etching and engraving (S504) is completed, the protective coating treatment (S505) can be carried out.

7. The preparation method of the capacitor housing according to claim 1, characterized in that: The housing assembly and welding (S6) includes assembly process selection (S601), welding process selection (S602), sealing process (S603), automated assembly and manual cooperation (S604), and assembly quality inspection (S605). For the housing assembly and welding (S6), the assembly process selection (S601) shall be carried out. After the assembly process selection (S601) is completed, the welding process selection (S602) can be carried out. After the welding process selection (S602) is completed, the sealing process (S603) can be carried out. After the sealing process (S603) is completed, the automated assembly and manual cooperation (S604) can be carried out. After the automated assembly and manual cooperation (S604) is achieved, the assembly quality inspection (S605) can be carried out.

8. The preparation method of the capacitor housing according to claim 1, characterized in that: The final inspection and quality assurance (S7) of the housing includes appearance and surface quality inspection (S701), functional testing (S702), environmental adaptability testing (S703), long-term reliability testing (S704), and final quality acceptance and identification (S705). For the final inspection and quality assurance (S7) of the housing, the appearance and surface quality inspection (S701) shall be carried out first. After the appearance and surface quality inspection (S701), the functional testing (S702) shall be carried out. After the functional testing (S702), the environmental adaptability testing (S703) can be carried out. After the environmental adaptability testing (S703) is completed, the long-term reliability testing (S704) can be carried out. After the long-term reliability testing (S704), the final quality acceptance and identification (S705) can be carried out.

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