A through aluminum foil for aluminum electrolytic capacitors

Abstract

This utility model relates to the field of aluminum foil production technology, specifically a through-type aluminum foil for aluminum electrolytic capacitors. The utility model includes a copper foil body, with protective layers fixedly connected to both sides of the copper foil body. The protective layers are made of polyimide. A plurality of reinforcing wires, made of carbon fiber, are threaded through the copper foil body in a linear array and evenly distributed within the body. A protective mesh, made of aramid fiber, is fixedly connected to the outside of the protective layers. A thermally conductive layer, made of graphene coating, is fixedly connected to the outside of the protective mesh. This invention solves the problems of insufficient mechanical strength, easy tearing during processing and use, poor heat dissipation, difficulty in dissipating heat under high loads, affecting capacitor lifespan, and susceptibility to corrosion and erosion in humid and microbial environments, reducing capacitor reliability and limiting its application range when traditional aluminum foil is used in aluminum electrolytic capacitors.

Description

Technical Field

[0001] This utility model relates to the field of aluminum foil production technology, and in particular to a through aluminum foil for use in aluminum electrolytic capacitors. Background Technology

[0002] Electrolytic capacitors are indispensable components in electronic products. With the rapid development of electronic technology, the assembly density and integration level of electronic devices are further increasing. Aluminum electrolytic capacitors, as key, non-integrable discrete components, are developing towards smaller size, larger capacity, lower cost, and higher frequency and lower impedance. Aluminum electrolytic capacitors have excellent performance, large capacity, low price, ease of processing, and convenient use, and are therefore widely used in information electronic equipment, instruments, electromechanical products, and home appliances. Aluminum foil, as a key material in the production of aluminum electrolytic capacitors, has also made rapid progress in production technology, resulting in continuous improvement in product performance.

[0003] Regarding the aforementioned and existing related technologies, the inventors believe that the following shortcomings often exist: Traditional aluminum foil has many deficiencies when applied to aluminum electrolytic capacitors. For example, ordinary aluminum foil lacks mechanical strength, making it prone to tearing during processing and use, thus limiting its application range. Furthermore, its heat dissipation performance is limited; when the capacitor operates under high load, the generated heat is difficult to dissipate quickly, leading to an increase in internal temperature and affecting the capacitor's performance and lifespan. Simultaneously, in humid environments with microbial growth, aluminum foil is susceptible to corrosion and microbial attack, further reducing the capacitor's reliability. Therefore, to address these problems, a through-type aluminum foil for aluminum electrolytic capacitors is proposed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies where traditional aluminum foil used in aluminum electrolytic capacitors suffers from insufficient mechanical strength, easy tearing during processing and use, poor heat dissipation performance, difficulty in dissipating heat under high loads, affecting capacitor performance and lifespan, and susceptibility to corrosion and erosion in humid and microbial environments, reducing capacitor reliability and limiting its application range. Therefore, this invention proposes a through-hole aluminum foil for aluminum electrolytic capacitors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a through aluminum foil for an aluminum electrolytic capacitor, comprising a copper foil body, both sides of which are fixedly connected to a protective layer, the protective layer being polyimide, and a plurality of reinforcing wires passing through the copper foil body, the plurality of reinforcing wires being evenly distributed in a linear array within the copper foil body, the reinforcing wires being carbon fiber.

[0006] The effects achieved by the above components are as follows: by providing a polyimide protective layer in the copper foil body, the tear resistance of the copper foil body can be improved. At the same time, the carbon fiber reinforcing filaments are evenly distributed in a linear array in the copper foil body, which effectively enhances the overall strength and toughness of the copper foil. The two work together to significantly improve the mechanical properties and stability of aluminum foil in the application of aluminum electrolytic capacitors.

[0007] Preferably, a protective net is fixedly connected to the outer side of the protective layer, and the protective net is an aramid fiber woven mesh.

[0008] The effect achieved by the above components is as follows: the aramid fiber woven mesh is fixed on the outside of the polyimide protective layer as a protective mesh. With the high strength and high toughness of aramid fiber, it can further enhance the protection of the copper foil body, resist external mechanical impact and wear, and improve the overall durability and reliability of the aluminum foil.

[0009] Preferably, a heat-conducting layer is fixedly connected to the outer side of the protective net, and the heat-conducting layer is a graphene coating.

[0010] The effects achieved by the above components are as follows: the graphene coating serves as a thermally conductive layer, utilizing the excellent thermal conductivity of graphene to quickly conduct the heat generated during the operation of the aluminum foil, effectively reducing the temperature and preventing overheating from affecting the performance of the aluminum electrolytic capacitor. At the same time, its good flexibility is also compatible with the aluminum foil structure.

[0011] Preferably, a waterproof layer is fixedly connected to the outside of the thermally conductive layer, and the waterproof layer is polytetrafluoroethylene.

[0012] The effect achieved by the above components is as follows: a polytetrafluoroethylene (PTFE) waterproof layer is set on the outside of the heat-conducting layer. Utilizing the extremely strong hydrophobicity and chemical stability of PTFE, moisture can be effectively blocked, preventing the aluminum foil from corroding due to moisture, ensuring the stable operation of the aluminum electrolytic capacitor in a humid environment, and extending its service life.

[0013] Preferably, an antibacterial layer is fixedly connected to the outside of the waterproof layer, and the antibacterial layer is a nano-alumina antibacterial coating.

[0014] The effect achieved by the above components is as follows: the outer side of the waterproof layer is provided with a nano-alumina antibacterial coating as an antibacterial layer. With the antibacterial properties of nano-alumina, it can effectively inhibit the growth of bacteria and prevent microorganisms from corroding the aluminum foil and surrounding structures or affecting their performance. It is especially suitable for application scenarios with high requirements for hygiene conditions and ensures the long-term stable operation of aluminum electrolytic capacitors.

[0015] Preferably, the surface of the copper foil body is provided with a plurality of through holes, and the plurality of through holes are evenly distributed on the surface of the copper foil body.

[0016] The effects achieved by the above components are as follows: the through holes can accelerate the contact between the electrolyte and the electrodes inside the aluminum electrolytic capacitor and the ion migration speed, thereby improving the charging and discharging efficiency; at the same time, the ventilation channels formed by the through holes can timely discharge the heat and gas generated during the operation of the capacitor, reduce the internal pressure, avoid performance degradation caused by heat accumulation or excessive gas pressure, and enhance the stability and service life of the capacitor.

[0017] In summary, the beneficial effects of this utility model are as follows:

[0018] In this invention, by providing a polyimide protective layer within the copper foil body, the tear resistance of the copper foil body can be improved. At the same time, carbon fiber reinforcing filaments are uniformly distributed in a linear array within the copper foil body, effectively enhancing the overall strength and toughness of the copper foil. The synergistic effect of the two significantly improves the mechanical properties and stability of the aluminum foil in the application of aluminum electrolytic capacitors. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 In this utility model Figure 1 Enlarged view of point A;

[0021] Figure 3 This is a schematic diagram of the structure of the copper foil body in this utility model;

[0022] Figure 4 This is a schematic diagram of the protective netting structure in this utility model.

[0023] Legend: 1. Copper foil body; 2. Reinforcing wire; 3. Protective layer; 4. Protective mesh; 5. Thermal conductive layer; 6. Waterproof layer; 7. Antibacterial layer; 8. Through hole. Detailed Implementation

[0024] Reference Figures 1-4As shown, this utility model provides a technical solution: a through-type aluminum foil for aluminum electrolytic capacitors, comprising a copper foil body 1, with a protective layer 3 fixedly connected to both sides of the copper foil body 1. The protective layer 3 is polyimide. A plurality of reinforcing wires 2 are threaded through the copper foil body 1, and these reinforcing wires 2 are evenly distributed in a linear array within the copper foil body 1. The reinforcing wires 2 are carbon fibers. By providing the polyimide protective layer 3 within the copper foil body 1, the tear resistance of the copper foil body 1 can be improved. Simultaneously, the carbon fiber reinforcing wires 2, evenly distributed in a linear array within the copper foil body 1, effectively enhance the overall strength and toughness of the copper foil. The synergistic effect of these two elements significantly improves the performance of the aluminum foil in aluminum electrolytic capacitors. In capacitor applications, to ensure mechanical performance and stability, a protective mesh 4 is fixedly connected to the outside of the protective layer 3. The protective mesh 4 is made of aramid fiber woven mesh. The aramid fiber woven mesh, fixed to the outside of the polyimide protective layer 3, leverages the high strength and high toughness of aramid fibers to further enhance the protection of the copper foil body 1, resisting external mechanical impacts and wear, and improving the overall durability and reliability of the aluminum foil. A thermally conductive layer 5, made of graphene coating, is fixedly connected to the outside of the protective mesh 4. Utilizing the excellent thermal conductivity of graphene, the heat generated during aluminum foil operation can be quickly conducted away, effectively reducing temperature and preventing overheating from affecting performance. The aluminum electrolytic capacitor boasts excellent performance and its good flexibility is well-suited to the aluminum foil structure. A waterproof layer 6, made of polytetrafluoroethylene (PTFE), is fixedly connected to the outside of the thermally conductive layer 5. PTFE's strong hydrophobicity and chemical stability effectively block moisture, preventing corrosion of the aluminum foil due to dampness. This ensures stable operation of the aluminum electrolytic capacitor in humid environments and extends its service life. An antibacterial layer 7, a nano-alumina antibacterial coating, is also fixedly connected to the outside of the waterproof layer 6. The antibacterial properties of nano-alumina effectively inhibit bacterial growth. To prevent microorganisms from corroding the aluminum foil and surrounding structures or affecting performance, this method is particularly suitable for applications with high hygiene requirements, ensuring long-term stable operation of aluminum electrolytic capacitors. Several through holes 8 are evenly distributed on the surface of the copper foil body 1. The through holes 8 can accelerate the contact between the electrolyte and the electrodes inside the aluminum electrolytic capacitor and the ion migration speed, thereby improving the charging and discharging efficiency. At the same time, the ventilated channels formed by the through holes 8 can timely discharge the heat and gas generated during capacitor operation, reduce internal pressure, avoid performance degradation caused by heat accumulation or excessive gas pressure, and enhance the stability and service life of the capacitor.

[0025] Working principle: The polyimide protective layers 3 on both sides of the copper foil body 1 absorb external impacts through the flexibility of the molecular chains, improving tear resistance. The carbon fiber reinforcing filaments 2 distributed linearly inside enhance the overall strength and toughness of the copper foil body 1. The two are bonded together at the interface to form a reinforcement system, which greatly improves the tear resistance of the copper foil body 1. The protective net 4 of aramid fiber woven mesh on the outside disperses external impact forces with a grid structure, further resisting mechanical wear. The through holes 8 evenly distributed on the surface of the copper foil body 1 increase the specific surface area, accelerate the contact between the electrolyte and the electrode, improve the ion migration speed, and form a breathable channel to promote hot air convection. Combined with the graphene coating heat conduction network, the working heat is quickly dissipated, which reduces the internal temperature of the capacitor. The polytetrafluoroethylene waterproof layer 6 isolates moisture with its strong hydrophobicity. The nano-alumina antibacterial layer 7 inhibits microorganisms by adsorbing and destroying bacterial cell membranes, forming an environmental protection system. Through the physical and chemical interactions and structural synergy between the materials, the copper foil body 1 achieves a comprehensive improvement in mechanical stability, heat dissipation efficiency and environmental resistance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A through-type aluminum foil for aluminum electrolytic capacitors, comprising a copper foil body (1), characterized in that: The copper foil body (1) is fixedly connected to both sides with a protective layer (3), the protective layer (3) is polyimide, and a number of reinforcing wires (2) are threaded inside the copper foil body (1). The number of reinforcing wires (2) are evenly distributed in a linear array inside the copper foil body (1), and the reinforcing wires (2) are carbon fibers.

2. The through-type aluminum foil for aluminum electrolytic capacitors according to claim 1, characterized in that: A protective net (4) is fixedly connected to the outside of the protective layer (3), and the protective net (4) is an aramid fiber woven net.

3. A through-type aluminum foil for an aluminum electrolytic capacitor according to claim 2, characterized in that: A heat-conducting layer (5) is fixedly connected to the outside of the protective net (4), and the heat-conducting layer (5) is a graphene coating.

4. A through-type aluminum foil for an aluminum electrolytic capacitor according to claim 3, characterized in that: A waterproof layer (6) is fixedly connected to the outside of the heat-conducting layer (5), and the waterproof layer (6) is polytetrafluoroethylene.

5. A through-type aluminum foil for an aluminum electrolytic capacitor according to claim 4, characterized in that: An antibacterial layer (7) is fixedly connected to the outside of the waterproof layer (6), and the antibacterial layer (7) is a nano-alumina antibacterial coating.

6. A through-type aluminum foil for an aluminum electrolytic capacitor according to claim 1, characterized in that: The surface of the copper foil body (1) is provided with a plurality of through holes (8), and the plurality of through holes (8) are evenly distributed on the surface of the copper foil body (1).

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