Large ripple current resistant capacitor

Abstract

The utility model relates to the technical field of capacitors resistant to large ripple current, and discloses a capacitor resistant to large ripple current, which comprises a packaging shell, the inner wall of the packaging shell is fixedly connected with an aluminum shell, the top end of the aluminum shell is fixedly connected with a butt joint ring, and the top end of the butt joint ring is connected with a cover plate through an installation assembly. An electric connection plate is fixedly connected to the top end of the cover plate, a molten pool groove is formed in the inner diameter of the butt joint ring, poke rods are slidably connected to the front side and the rear side of the outer wall of the top end of the cover plate, electrode aluminum foils are connected to the left side and the right side of the top end of the electric connection plate through capacitor assemblies, and a fixing column is fixedly connected to the bottom end of the inner wall of the cover plate. According to the utility model, the cover plate and the aluminum shell can be accurately aligned, the positions of the cover plate and the aluminum shell are ensured to be accurate in the welding process, the two capacitor cores are connected in parallel, and the capacities of the two capacitor cores can be superposed by connecting the capacitor cores in parallel, so that the total capacity of the whole capacitor is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of large ripple current resistant capacitors, and particularly relates to a large ripple current resistant capacitor. Background Technique

[0002] The large ripple current resistant capacitor has high ripple current bearing capacity, low equivalent series resistance (ESR), long service life and high temperature stability, and is widely used in fields such as switching power supplies, electric vehicles, industrial inverters and communication equipment. When selecting a model, ripple current capacity, working voltage, temperature range and ESR value need to be considered. Common types include aluminum electrolytic capacitors, tantalum capacitors, ceramic capacitors and thin film capacitors.

[0003] After retrieval, an aluminum electrolytic capacitor with large ripple current resistance, with the publication number CN219610228U, includes an aluminum shell. Inside the aluminum shell, a positive aluminum foil and a negative aluminum foil are separated by electrolytic paper. The electrolytic paper overlaps and winds the separated positive aluminum foil and negative aluminum foil to form a core. The positive aluminum foil is a positive aluminum foil treated by phosphating. Through the material selection design of the positive and negative aluminum foils, the optimization of the core winding structure, the riveting process of the negative lead foil strip and the negative aluminum foil, and the optimization of the riveting process of the positive lead foil strip and the cover plate, the ripple current resistance ability of the aluminum electrolytic capacitor is greatly improved, and the ripple current is increased by 25 - 50% on the basis of conventional products.

[0004] Based on the above patent, through the material selection design of the positive and negative aluminum foils, the optimization of the core winding structure, the riveting process of the negative lead foil strip and the negative aluminum foil, and the optimization of the riveting process of the positive lead foil strip and the cover plate, the ripple current resistance ability of the aluminum electrolytic capacitor is greatly improved, and the ripple current is increased by 25 - 50% on the basis of conventional products. However, when connecting the cover plate and the aluminum shell with welding materials in this patent, the cover plate is easily detached from the aluminum shell, resulting in inconvenience in installing the cover plate and the aluminum shell. And insecure installation or uneven contact surface will lead to poor electrical contact, affecting the performance of the capacitor, increasing the resistance, and thus affecting the overall efficiency and stability of the circuit. Content of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art, and to propose a large ripple current resistant capacitor, which helps to accurately align the cover plate and the aluminum shell, ensure the accurate position of the two during the welding process, improve the ripple resistance effect of the capacitor, and the improvement of the ripple current resistance ability can reduce the heat accumulation inside the capacitor.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A large ripple current resistant capacitor, comprising a packaging shell, an aluminum shell fixedly connected to the inner wall of the packaging shell, a docking ring fixedly connected to the top of the aluminum shell, a cover plate connected to the top of the docking ring through an installation component, an electrical connection plate fixedly connected to the top of the cover plate, a melting pool groove formed in the inner diameter of the docking ring, a toggle rod slidably connected to the front and rear sides of the outer wall of the top of the cover plate, electrode aluminum foils connected to the left and right sides of the top of the electrical connection plate through capacitance components, a fixed column fixedly connected to the bottom end of the inner wall of the cover plate, and fixing frames fixedly connected to the four sides of the top of the inner wall of the cover plate.

[0008] Further, the installation component includes a moving plate connected to the outer wall of the fixed column through a return spring, traction plates rotatably connected to the four sides of the outer wall of the moving plate, and clamping plates rotatably connected to the opposite ends of the traction plates.

[0009] Further, the capacitance component includes a polypropylene film fixedly connected to the inner wall of the aluminum shell, a polytetrafluoroethylene film fixedly connected to the inner wall of the polypropylene film, capacitance cores installed on the left and right sides of the bottom end of the inner wall of the polytetrafluoroethylene film, and electrical contact points installed on the top ends of the capacitance cores.

[0010] Further, the outer wall of the cover plate is in close contact with the inner wall of the melting pool groove, and the bottom ends of the toggle rods are respectively fixedly connected to the front and rear sides of the top end of the return spring.

[0011] Further, the bottom end of the return spring is fixedly connected to the bottom end of the inner wall of the cover plate, and the top end of the return spring is fixedly connected to the bottom end of the moving plate.

[0012] Further, the opposite ends of the traction plates are respectively installed on the outer wall of the bottom end of the fixing frame, and the outer walls of the opposite ends of the clamping plates are rotatably connected to the four sides of the outer wall of the cover plate.

[0013] Further, the opposite ends of the clamping plates are detachably connected to the four sides of the inner wall of the aluminum shell, and the four sides of the outer wall of the moving plate are slidably connected to the inner wall of the cover plate.

[0014] Further, the bottom end of the polytetrafluoroethylene film is fixedly connected to the bottom end of the inner wall of the aluminum shell, the bottom ends of the capacitance cores are respectively fixedly connected to the left and right sides of the bottom end of the inner wall of the aluminum shell, and the top ends of the electrical contact points are in close contact with the bottom end of the cover plate.

[0015] The utility model has the following beneficial effects:

[0016] 1. In the utility model, through the combined use of the fixed column, the fixing frame, the return spring, the moving plate, the traction plate and the clamping plate, it is helpful to accurately align the cover plate and the aluminum shell, ensure the accurate position of the two during the welding process, thereby improving the welding quality and reliability, reducing welding defects such as voids, cracks or incomplete penetration, and improving the quality of the welding joint.

[0017] 2. In the present utility model, through the combined use of an electrical connection board, an aluminum shell, a polypropylene film, a polytetrafluoroethylene film, a capacitor core, and electrical contacts, the two capacitor cores are connected in parallel. By connecting the capacitor cores in parallel, their capacitances can be superimposed, thereby increasing the total capacitance of the entire capacitor, improving its ability to withstand ripple current. Since ripple current = ripple voltage / capacitance, it also reduces the impact of the failure of a single capacitor on the performance of the overall capacitor, thereby improving the reliability and long-term stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional view of a large ripple current withstand capacitor proposed by the present utility model;

[0019] Figure 2 is a half-sectional view of the packaging shell of a large ripple current withstand capacitor proposed by the present utility model;

[0020] Figure 3 is a half-sectional view of the aluminum shell of a large ripple current withstand capacitor proposed by the present utility model;

[0021] Figure 4 is a half-sectional view of the moving plate of a large ripple current withstand capacitor proposed by the present utility model;

[0022] Figure 5 is a half-sectional view of the cover plate of a large ripple current withstand capacitor proposed by the present utility model;

[0023] Figure 6 is a schematic structural view of the capacitor core of a large ripple current withstand capacitor proposed by the present utility model.

[0024] Legend Explanation:

[0025] 1. Packaging shell; 2. Aluminum shell; 3. Docking ring; 4. Cover plate; 5. Electrical connection board; 6. Molten pool groove; 7. Poking rod; 8. Electrode aluminum foil; 9. Fixed column; 10. Fixed frame; 11. Return spring; 12. Moving plate; 13. Traction plate; 14. Clamping plate; 15. Polypropylene film; 16. Polytetrafluoroethylene film; 17. Capacitor core; 18. Electrical contact. DETAILED IMPLEMENTATION MANNER

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Refer to Figure 1, an embodiment provided by the present utility model: a large ripple current resistant capacitor, including a packaging shell 1, an aluminum shell 2 is fixedly connected to the inner wall of the packaging shell 1, a docking ring 3 is fixedly connected to the top of the aluminum shell 2, a cover plate 4 is connected to the top of the docking ring 3 through an installation component, an electrical connection plate 5 is fixedly connected to the top of the cover plate 4, a molten pool groove 6 is provided in the inner diameter of the docking ring 3, a toggle rod 7 is slidably connected to the front and rear sides of the outer wall of the top of the cover plate 4, electrode aluminum foils 8 are connected to the left and right sides of the top of the electrical connection plate 5 through capacitor components, a fixing column 9 is fixedly connected to the bottom end of the inner wall of the cover plate 4, and fixing frames 10 are fixedly connected to the four sides of the top end of the inner wall of the cover plate 4. Installing the cover plate 4 at the aluminum shell 2 facilitates the installation of electronic components inside the aluminum shell 2, and the electrode aluminum foils 8 can be installed at the locations to be installed. The molten pool groove 6 is convenient as a molten pool for filling welding flux during welding, so as to carry out the fixing work. The outer wall of the cover plate 4 is in close contact with the inner wall of the molten pool groove 6, and the bottom ends of the toggle rods 7 are respectively fixedly connected to the front and rear sides of the top of the return spring 11.

[0028] Specifically:

[0029] Referring to Figure 4 and Figure 5 , a moving plate 12 is connected to the outer wall of the fixing column 9 through a return spring 11. Traction plates 13 are rotatably connected to the four sides of the outer wall of the moving plate 12. Clamping plates 14 are rotatably connected to the opposite ends of the traction plates 13. After docking the cover plate 4 at the aluminum shell 2, release the toggle rod 7, so that the moving plate 12 drives the traction plates 13 to pull the clamping plates 14 to open to both sides through the elastic force of the return spring 11, so that the clamping plates 14 are clamped at the aluminum shell 2, so that the cover plate 4 is pre-installed during pre-welding, which helps to accurately align the cover plate 4 and the aluminum shell 2. The bottom end of the return spring 11 is fixedly connected to the bottom end of the inner wall of the cover plate 4, the top end of the return spring 11 is fixedly connected to the bottom end of the moving plate 12, the opposite ends of the traction plates 13 are respectively installed on the outer wall of the bottom end of the fixing frame 10, the outer walls of the opposite ends of the clamping plates 14 are rotatably connected to the four sides of the outer wall of the cover plate 4, the opposite ends of the clamping plates 14 are detachably connected to the four sides of the inner wall of the aluminum shell 2, and the four sides of the outer wall of the moving plate 12 are slidably connected to the inner wall of the cover plate 4, ensuring that the positions of the two are accurate during the welding process, thereby improving the welding quality and reliability, reducing welding defects such as voids, cracks or incomplete penetration, etc., and improving the quality of the welded joint.

[0030] Specifically:

[0031] Referring to Figure 2 , Figure 3 and Figure 6, a polypropylene film 15 is fixedly connected to the inner wall of the aluminum shell 2, a polytetrafluoroethylene film 16 is fixedly connected to the inner wall of the polypropylene film 15, and capacitor cores 17 are installed on both the left and right sides at the bottom end of the inner wall of the polytetrafluoroethylene film 16. Electric contacts 18 are installed at the top ends of the capacitor cores 17. The packaging shell 1 can provide external protection for the capacitor, and the aluminum shell 2 can effectively dissipate the heat generated inside the capacitor to prevent the capacitor from overheating. The polypropylene film 15 has excellent heat resistance and chemical stability, and adopts a biaxial stretching process to improve its mechanical strength and electrical properties. The low dielectric loss and high dielectric strength of the polytetrafluoroethylene film 16 make it perform excellently in high-frequency applications. The bottom end of the polytetrafluoroethylene film 16 is fixedly connected to the bottom end of the inner wall of the aluminum shell 2, and the bottom ends of the capacitor cores 17 are respectively fixedly connected to both the left and right sides at the bottom end of the inner wall of the aluminum shell 2. The top ends of the electric contacts 18 are in close contact with the bottom end of the cover plate 4, so that the two capacitor cores 17 are connected in parallel. By connecting the capacitor cores 17 in parallel, their capacitances can be superimposed, thereby increasing the total capacitance of the entire capacitor to improve its ability to withstand ripple current, because ripple current = ripple voltage / capacitance, and at the same time reducing the impact of the failure of a single capacitor on the performance of the overall capacitor, thereby improving the reliability and long-term stability of the system.

[0032] Working principle: Install the cover plate 4 on the aluminum shell 2 to facilitate the installation of the electronic components inside the aluminum shell 2, and the electrode aluminum foil 8 can be installed at the location to be installed. The molten pool tank 6 can be used as the molten pool for filling the welding flux during welding, so as to carry out the fixing work. After docking the cover plate 4 to the aluminum shell 2, loosen the toggle lever 7, so that the moving plate 12 drives the traction plate 13 to drive the clamping plate 14 to open to both sides through the elastic force of the return spring 11, so that the clamping plate 14 is clamped on the aluminum shell 2, so that the cover plate 4 is pre-installed during pre-welding, which helps to accurately align the cover plate 4 and the aluminum shell 2, ensure that their positions are accurate during the welding process, thereby improving the welding quality and reliability, reducing welding defects such as voids, cracks or incomplete penetration, improving the quality of the welded joint. The packaging shell 1 can provide external protection for the capacitor, and the aluminum shell 2 can effectively dissipate the heat generated inside the capacitor to prevent the capacitor from overheating. The polypropylene film 15 has excellent heat resistance and chemical stability, and adopts a biaxial stretching process to improve its mechanical strength and electrical properties. The low dielectric loss and high dielectric strength of the polytetrafluoroethylene film 16 make it perform excellently in high-frequency applications. The two capacitor cores 17 are connected in parallel. By connecting the capacitor cores 17 in parallel, their capacitances can be superimposed, thereby increasing the total capacitance of the entire capacitor, reducing the impact of the failure of a single capacitor on the performance of the overall capacitor, thereby improving its ability to withstand ripple current, because ripple current = ripple voltage / capacitance, so the reliability and long-term stability of the system are also improved.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A capacitor with high ripple current resistance, comprising a packaging shell (1), characterized in that: The inner wall of the packaging shell (1) is fixedly connected to an aluminum shell (2), the top of the aluminum shell (2) is fixedly connected to a docking ring (3), the top of the docking ring (3) is connected to a cover plate (4) through a mounting assembly, the top of the cover plate (4) is fixedly connected to an electric connection plate (5), the inner diameter of the docking ring (3) is provided with a molten pool groove (6), the front and rear sides of the outer wall of the top of the cover plate (4) are slidably connected to a toggle rod (7), the left and right sides of the top of the electric connection plate (5) are connected to electrode aluminum foil (8) through a capacitor assembly, the bottom of the inner wall of the cover plate (4) is fixedly connected to a fixing column (9), and the four sides of the top of the inner wall of the cover plate (4) are fixedly connected to a fixing frame (10).

2. The high ripple current resistant capacitor according to claim 1, characterized in that: The mounting assembly comprises a movable plate (12) located on the outer wall of a fixed column (9) and connected via a return spring (11); four sides of the outer wall of the movable plate (12) are rotatably connected to traction plates (13); and the opposite ends of the traction plates (13) are rotatably connected to a clamping plate (14).

3. The large ripple current resistant capacitor according to claim 1, characterized in that: The capacitor assembly comprises a polypropylene film (15) fixedly connected to the inner wall of the aluminum shell (2), a polytetrafluoroethylene film (16) fixedly connected to the inner wall of the polypropylene film (15), capacitor cores (17) installed on both left and right sides of the bottom end of the inner wall of the polytetrafluoroethylene film (16), and electrical contacts (18) installed on the top of the capacitor core (17).

4. The high ripple current resistant capacitor according to claim 1, characterized in that: The outer wall of the cover plate (4) is tightly attached to the inner wall of the molten pool groove (6), and the bottom end of the toggle rod (7) is fixedly connected to the front and rear sides of the top of the return spring (11).

5. The large ripple current resistant capacitor according to claim 2, characterized in that: The bottom end of the return spring (11) is fixedly connected to the bottom end of the inner wall of the cover plate (4), and the top end of the return spring (11) is fixedly connected to the bottom end of the moving plate (12).

6. The high ripple current resistant capacitor according to claim 2, characterized in that: The opposite ends of the traction plates (13) are respectively mounted on the outer wall of the bottom end of the fixing frame (10), and the opposite ends of the outer wall of the clamping plates (14) are rotatably connected to the four sides of the outer wall of the cover plate (4).

7. The high ripple current resistant capacitor according to claim 2, characterized in that: The opposite end of the clamping plate (14) is detachably connected to the four sides of the inner wall of the aluminum shell (2), and the four sides of the outer wall of the movable plate (12) are slidably connected to the inner wall of the cover plate (4).

8. The large ripple current resistant capacitor according to claim 3, characterized in that: The bottom end of the polytetrafluoroethylene film (16) is fixedly connected to the bottom end of the inner wall of the aluminum shell (2), the bottom end of the capacitor core (17) is respectively fixedly connected to the left and right sides of the bottom end of the inner wall of the aluminum shell (2), and the top end of the electric contact (18) is tightly attached to the bottom end of the cover plate (4).

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