Electrolytic capacitor
By setting a pad paper layer with a composite structure of a high-density dielectric layer and a low-density adsorption layer at the bottom of the aluminum shell of the electrolytic capacitor, the problem of electrolyte flashover caused by the adsorption of water molecules by the electrolyte when exposed to air is solved, thus improving the safety and reliability of the capacitor.
Patent Information
- Application Number
- CN202520029450.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-06
AI Technical Summary
When high-voltage electrolytic capacitors are exposed to air during the production process, the desiccant in the electrolyte will adsorb water molecules in the air, changing the local electrical parameters of the electrolyte. This leads to a local short-board effect in the electrolyte flash voltage, which can easily cause non-burr-type breakdown at the winding edge of the electrolytic capacitor.
A paper pad is placed at the bottom of the aluminum shell of the electrolytic capacitor. The paper pad is a composite structure of a high-density dielectric layer and a low-density adsorption layer. It is used to adsorb the electrolyte of the core after winding, prevent water molecule interference, and prevent the positive electrode from deviating from the winding and contacting the aluminum shell, which could cause arcing, burn-through, or short circuit.
It effectively prevents the electrolyte from adsorbing water molecules from the air, improves the safety performance of electrolytic capacitors, prevents arcing, burn-through or short circuits, and enhances the safety of capacitors.
Smart Images
Figure CN223770974U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electronic device technology, and in particular relates to an electrolytic capacitor. Background Technology
[0002] Among various capacitors, electrolytic capacitors are widely popular because, for the same size, aluminum electrolytic capacitors can achieve a larger CV value per unit area, store more charge, and are cheaper.
[0003] In recent years, the application of high-voltage, large-capacity, and high-ripple-current leaded electrolytic capacitors has gradually increased. In particular, the widespread use of leaded plug-in electrolytic capacitors with voltage ranges of 400-600V (large particle diameter: Φ16x30-Φ22x60mm, capacitance range of 82UF-220UF) has led to the increasingly widespread application of this type of capacitor.
[0004] However, for this type of leaded high-voltage electrolytic capacitor, especially high-voltage 500V-600V capacitors, such as 600V capacitors, the water content of the electrolyte is less than 0.5%-3%. During the manufacturing process, the cells cannot be avoided from being exposed to air. When exposed to air, the desiccant properties of the electrolyte will adsorb water molecules present in the air, changing the local electrical parameters of the electrolyte. This can easily cause a local short-board effect in the electrolyte flashover voltage, which is a factor leading to non-burr-type breakdown at the winding edge of the electrolytic capacitor.
[0005] The above background information is provided only to aid in understanding the inventive concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content
[0006] The purpose of this invention is to provide an electrolytic capacitor to solve at least one of the problems mentioned above in the background section.
[0007] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:
[0008] An electrolytic capacitor includes an aluminum shell, a core package installed inside the aluminum shell, and a cover plate for encapsulating the core package inside the aluminum shell; wherein, the core package includes a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer, and a cathode aluminum foil layer arranged sequentially from the inside out; a positive electrode pin is riveted to the anode aluminum foil layer, and a negative electrode pin is riveted to the cathode aluminum foil layer; wherein, a sandwich paper film is provided at the position where the positive electrode pin is riveted to the anode aluminum foil layer and / or at the position where the negative electrode pin is riveted to the cathode aluminum foil layer, and a padding paper layer is provided at the bottom of the aluminum shell.
[0009] In some embodiments, the padding paper layer is a composite structure having a high-density dielectric layer and a low-density adsorption layer.
[0010] In some embodiments, the padding paper layer is a thickened cotton and linen paper material obtained by a composite papermaking process using both cylindrical and long-wire processes.
[0011] In some embodiments, the padding paper layer is circular, the diameter of the padding paper layer is equal to the inner diameter of the aluminum shell, and the periphery of the padding paper layer is in close contact with the inner wall of the aluminum shell.
[0012] In some embodiments, the upper and / or lower surfaces of the padding paper layer are flat planes, wherein the lower surface of the padding paper layer is in full contact with the bottom surface of the aluminum shell, and the upper surface of the padding paper layer is in full contact with the bottom of the core package.
[0013] In some embodiments, the upper and / or lower surfaces of the padding paper layer are non-flat planes, wherein there is a gap between the lower surface of the padding paper layer and the bottom surface of the aluminum shell or a gap between the upper surface of the padding paper layer and the bottom of the core package.
[0014] In some embodiments, the interlayer paper film is a composite structure having a high-density dielectric layer and a low-density adsorption layer.
[0015] In some embodiments, the interlayer paper film is square, and the height of the interlayer paper film is less than or equal to the height of the anode aluminum foil layer and the cathode aluminum foil layer.
[0016] In some embodiments, the composite density of the sandwich paper film in the composite structure is 0.65 g / cm³. 3 -0.85g / cm 3 .
[0017] In some embodiments, the positive electrode guide pin has the same structure as the negative electrode guide pin; the positive electrode guide pin includes a flat, sheet-like riveting portion, the height of which is less than the height of the interlayer paper film.
[0018] The beneficial effects of this utility model's technical solution are:
[0019] Compared to existing technologies, this novel electrolytic capacitor can absorb the electrolyte accumulated at the edge of the core during core winding, effectively preventing the harmful effects of process water molecules. At the same time, it can prevent a few positive electrodes from misaligning and contacting the aluminum shell, causing arcing and burning through the aluminum shell, or directly short-circuiting the aluminum shell and causing a short circuit, thus improving the safety performance of the electrolytic capacitor. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a three-dimensional schematic diagram of an electrolytic capacitor according to an embodiment of the present invention;
[0022] Figure 2 This is a partially exploded view of an electrolytic capacitor according to an embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of the core package of an electrolytic capacitor according to an embodiment of the present invention;
[0024] Figure 4 This is another schematic diagram of the core package of an electrolytic capacitor according to an embodiment of the present invention;
[0025] Figure 5 This is a schematic diagram of the assembly of the interlayer paper film and the positive electrode needle of an electrolytic capacitor according to an embodiment of the present invention. Detailed Implementation
[0026] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer and more understandable, and to enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.
[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, "multiple" means two or more. Terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0030] Reference Figures 1-5 As shown in the figure, as an embodiment of the present invention, an electrolytic capacitor 100 is provided, including an aluminum shell 10, a core package 20 installed inside the aluminum shell 10, and a cover plate for encapsulating the core 20 inside the aluminum shell; wherein, the core package 20 includes a first electrolytic paper layer 203, an anode aluminum foil layer 204, a second electrolytic paper layer 205, and a cathode aluminum foil layer 206 arranged sequentially from the inside to the outside; a positive electrode guide pin 2010 is riveted to the anode aluminum foil layer 204, and a negative electrode guide pin 2011 is riveted to the cathode aluminum foil layer 206; wherein, a sandwich paper film 202 is provided at the position where the positive electrode guide pin 2010 is riveted to the anode aluminum foil layer 204 and / or at the position where the negative electrode guide pin 2011 is riveted to the cathode aluminum foil layer 206; a pad paper layer 30 of the same material as the sandwich paper film 202 is provided at the bottom of the aluminum shell 10.
[0031] Reference Figure 3 , Figure 4 As shown, specifically, the first electrolytic paper layer 203, the anode aluminum foil layer 204 riveted with the positive electrode guide needle 2010, the second electrolytic paper layer 205, and the cathode aluminum foil layer 206 riveted with the negative electrode guide needle 2011 are wound together to form the core package. (Refer to...) Figure 2 As shown, in some embodiments, the end of the second electrolytic paper layer 205 is extended with an adhesive paper layer 207, and the core package 20 is wound and then wrapped tightly through the adhesive paper layer 207.
[0032] In some embodiments, the padding paper layer 30 is a composite structure having a high-density dielectric layer and a low-density adsorption layer; in some embodiments, the composite density of the padding paper layer 30 is 0.65 g / cm³. 3 -0.85g / cm 3 .
[0033] By setting a padding paper layer 30 at the bottom of the aluminum shell 10, the electrolyte accumulated at the edge of the core after winding can be absorbed, effectively preventing water molecules from damaging and interfering with the core process. In addition, the padding paper layer 30 can prevent a few positive electrodes from deviating and contacting the aluminum shell, causing arcing and burning through the aluminum shell, or directly short-circuiting the aluminum shell.
[0034] In some embodiments, the padding paper layer 30 is a thickened cotton and linen paper material obtained by a composite papermaking process using both cylindrical and long-wire processes.
[0035] In some embodiments, the thickness of the electrolytic paper layer is 40µm-70µm, and the electrolytic paper is a double-layer composite paper with a rotary screen or a double-layer composite paper with a rotary screen and a special screen. In some embodiments, the fiber structure of the electrolytic paper is circular.
[0036] Reference Figures 2-4 As shown, in some embodiments, the padding paper layer 30 is circular, and the diameter of the padding paper layer 30 is equal to the inner diameter of the aluminum shell, ensuring that the periphery of the padding paper layer 30 is in close contact with the inner wall of the aluminum shell. In some embodiments, the upper surface and / or lower surface of the padding paper layer 30 is a flat plane, the lower surface of the padding paper layer 30 is in full contact with the bottom surface of the aluminum shell, and the upper surface of the padding paper layer 30 is in full contact with the bottom of the core package; in some embodiments, the upper surface and / or lower surface of the padding paper layer 30 is not a flat plane, and there is a gap between the lower surface of the padding paper layer 30 and the bottom surface of the aluminum shell or between the upper surface of the padding paper layer 30 and the bottom of the core package.
[0037] In some embodiments, the sandwich paper film 202 is a composite structure having a high-density dielectric layer and a low-density adsorption layer; in some embodiments, the composite density of the sandwich paper film 202 is 0.65 g / cm³. 3 -0.85g / cm3 .
[0038] Reference Figure 4 , Figure 5 As shown, in some embodiments, the interlayer paper film 202 is square, and the height of the interlayer paper film 202 is less than or equal to the height of the anode aluminum foil layer 204 and the cathode aluminum foil layer 206; in some embodiments, the positive electrode guide needle 2010 has the same structure as the negative electrode guide needle 2011, and the positive electrode guide needle 2010 is used as an example for explanation; wherein, the positive electrode guide needle 2010 includes a flat sheet-like riveting portion 2012, the height of the sheet-like riveting portion 2012 is less than the height of the interlayer paper film 202; the width of the sheet-like riveting portion 2012 is at least less than half the width of the interlayer paper film 202.
[0039] In some embodiments, the positive electrode needle 2010 and the negative electrode needle 2011 have different structures. The thickness of the negative electrode needle 2011 is 100 μm-200 μm, and the thickness of the cathode aluminum foil layer 206 is 20 μm-60 μm. The surface of the positive electrode needle 2010 is high-voltage polarized. The material of the positive electrode needle 2010 and the anode aluminum foil is the same, 99.993% anode aluminum. The anode foil has a low specific capacitance with a unit area capacitance of 0.1 μF / cm²-0.32 μF / cm² and a thickness between 70 μm and 95 μm.
[0040] It is understood that the above description is a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the inventive concept, and all such substitutions or modifications should be considered within the scope of protection of this patent. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention.
[0041] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of different embodiments or examples, without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope defined by the appended claims.
[0042] Furthermore, the scope of this invention is not intended to be limited to the specific embodiments of the processes, machines, manufactures, material compositions, means, methods, and steps described in the specification. Those skilled in the art will readily understand that existing or later-developed disclosures, processes, machines, manufactures, material compositions, means, methods, or steps that perform substantially the same function as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein can be utilized. Therefore, the appended claims are intended to include such processes, machines, manufactures, material compositions, means, methods, or steps within their scope.
Claims
1. An electrolytic capacitor characterized by: An aluminum shell, a core package installed in the aluminum shell, and a cover plate for packaging the core package in the aluminum shell; wherein the core package comprises a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer, and a cathode aluminum foil layer arranged in sequence from inside to outside; a positive electrode guide needle is riveted on the anode aluminum foil layer, and a negative electrode guide needle is riveted on the cathode aluminum foil layer; wherein a clamping layer paper film is arranged at the position where the positive electrode guide needle is riveted on the anode aluminum foil layer and / or at the position where the negative electrode guide needle is riveted on the cathode aluminum foil layer; and a pad paper layer is arranged at the bottom of the aluminum shell.
2. The electrolytic capacitor of claim 1, wherein: The pad paper layer has a composite structure of a high-density dielectric layer and a low-density adsorption layer.
3. The electrolytic capacitor as claimed in claim 1, wherein: The pad paper layer is a cotton-ramie thickened paper obtained by a composite mixed paper process using a round net process and a long net process.
4. The electrolytic capacitor of claim 1 wherein: The pad paper layer is circular, and the diameter of the pad paper layer is equal to the inner diameter of the aluminum shell, and the periphery of the pad paper layer is in close contact with the inner wall of the aluminum shell.
5. The electrolytic capacitor of claim 1 wherein: The upper surface and / or the lower surface of the pad paper layer is a flat plane, wherein the lower surface of the pad paper layer is in full contact with the bottom surface of the aluminum shell, and the upper surface of the pad paper layer is in full contact with the bottom of the core package.
6. The electrolytic capacitor of claim 1 wherein: The upper surface and / or the lower surface of the pad paper layer is a non-flat plane, wherein there is a gap between the lower surface of the pad paper layer and the bottom surface of the aluminum shell or a gap between the upper surface of the pad paper layer and the bottom of the core package.
7. The electrolytic capacitor according to any one of claims 1 to 6, wherein: The clamping layer paper film has a composite structure of a high-density dielectric layer and a low-density adsorption layer.
8. The electrolytic capacitor of any one of claims 1 to 6, wherein: The clamping layer paper film is square, and the height of the clamping layer paper film is less than or equal to the height of the anode aluminum foil layer and the cathode aluminum foil layer.
9. The electrolytic capacitor of claim 7 wherein: The composite density of the sandwich paper film of the composite structure is 0.65 g / cm 3 -0.85 g / cm 3 .
10. The electrolytic capacitor as claimed in claim 9, wherein: The positive electrode guide needle and the negative electrode guide needle have the same structure; the positive electrode guide needle comprises a flat sheet riveting part, and the height of the sheet riveting part is less than the height of the clamping layer paper film.