Aluminum electrolytic capacitor

Abstract

The utility model discloses an aluminum electrolytic capacitor, which comprises an aluminum shell, a core bag arranged in the aluminum shell, and a cover plate used for packaging the core bag in the aluminum shell, wherein the core package comprises a plurality of electrolytic paper layers, an aluminum foil layer and a plurality of guide pins arranged on the aluminum foil layer; an interlayer paper film is placed at the position, where the guide pin is arranged, of the aluminum foil layer, and the guide pin is arranged on the aluminum foil layer in a riveting mode or in a riveting and ultrasonic welding combined mode. And the plurality of electrolytic paper layers and the aluminum foil layer provided with the guide pin are wound together to form the core package. The aluminum electrolytic capacitor provided by the utility model can prevent burr breakdown caused by guide pin riveting, avoids short circuit caused by burr breakdown, and further prolongs the service life of the aluminum electrolytic capacitor.

Description

Technical Field

[0001] This utility model belongs to the field of electronic device technology, and in particular relates to an aluminum electrolytic capacitor. Background Technology

[0002] Among various capacitors, aluminum electrolytic capacitors are widely popular because, for the same size, they 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 aluminum electrolytic capacitors has gradually increased. In particular, the widespread use of leaded aluminum 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, due to the varying processing levels of different manufacturers, the stability of the manufacturing process is difficult to control, and there are significant differences in the maturity of the electrolyte and the level of internal process control. In particular, the high ripple series is prone to breakdown at the guide pin riveting point, resulting in burr breakdown and short circuit, which in turn affects the service life of the 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 aluminum 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 aluminum 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 plurality of electrolytic paper layers, an aluminum foil layer, and a plurality of guide pins disposed on the aluminum foil layer; a sandwich paper film is placed at the position of the guide pins on the aluminum foil layer, and the guide pins are disposed on the aluminum foil layer by riveting or a combination of riveting and ultrasonic welding; the plurality of electrolytic paper layers and the aluminum foil layer with guide pins are wound together to form the core package.

[0009] In some embodiments, 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 guide pin is riveted to the anode aluminum foil layer, and a negative electrode guide pin is riveted to the cathode aluminum foil layer.

[0010] In some embodiments, the interlayer paper film is provided at the position where the positive electrode guide pin is riveted on the anode aluminum foil layer and / or at the position where the negative electrode guide pin is riveted on the cathode aluminum foil layer.

[0011] In some embodiments, the interlayer paper film is a composite structure having a high-density dielectric layer and a low-density adsorption layer.

[0012] In some embodiments, the thickness of the electrolytic paper layer is 40um-70um, 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.

[0013] 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.

[0014] 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 .

[0015] In some embodiments, the interlayer paper film is a thickened cotton and linen paper material produced using a composite papermaking process combining cylinder wire and wire wire processes.

[0016] 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.

[0017] In some embodiments, the positive electrode needle and the negative electrode needle have different structures, the thickness of the negative electrode needle is 100 μM-200 μM, and the thickness of the negative electrode aluminum foil layer is 20 μM-60 μM.

[0018] The beneficial effects of this utility model's technical solution are:

[0019] Compared with existing technologies, the aluminum electrolytic capacitor of this invention can prevent burr breakdown during pin riveting, avoid short circuits caused by burr breakdown, and thus improve the service life of the aluminum 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 aluminum electrolytic capacitor according to an embodiment of the present invention;

[0022] Figure 2 This is a partially exploded schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the core package of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the assembly of the interlayer paper film and the positive electrode lead of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0025] Figure 5 This is another schematic diagram of the core package of an aluminum 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 aluminum electrolytic capacitor 100 is provided, including an aluminum shell 10, a core package 20 installed in the aluminum shell 10, and a cover plate for encapsulating the core package in the aluminum shell; wherein, the core package 20 includes a plurality of electrolytic paper layers, an aluminum foil layer, and a plurality of guide pins 201 disposed on the aluminum foil layer; a sandwich paper film 202 is placed at the position where the guide pins 201 are disposed on the aluminum foil layer, and the guide pins 201 are disposed on the aluminum foil layer by riveting or a combination of riveting and ultrasonic welding; the plurality of electrolytic paper layers and the aluminum foil layer with guide pins are wound together to form the core package 20.

[0031] Reference Figure 3 , Figure 5As shown, specifically, in some embodiments, 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 out; 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, the interlayer paper film 202 is provided at the position where the positive electrode guide pin is riveted to the anode aluminum foil layer 204 and / or at the position where the negative electrode guide pin is riveted to the cathode aluminum foil layer 206; the first electrolytic paper layer 203, the anode aluminum foil layer 204 with the positive electrode guide pin 2010 riveted, the second electrolytic paper layer 205, and the cathode aluminum foil layer 206 with the negative electrode guide pin 2011 riveted are wound together to form the core package.

[0032] 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 / cm 3 By using this design, the high-density dielectric layer is fractured during riveting to increase the current path, reduce local impedance, and avoid short circuits caused by punctures from riveting burrs.

[0033] In some embodiments, the interlayer paper film 202 is a thickened cotton and linen paper material produced by a composite papermaking process using both cylindrical and wire mesh processes.

[0034] 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.

[0035] Reference Figures 3-5 As shown, 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. Taking the positive electrode guide needle as an example, the positive electrode guide needle 2010 includes a flat sheet-like riveting portion 2012, the height of which 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 riveting portion 2012.

[0036] 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 negative electrode 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 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.

[0037] 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.

[0038] 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.

[0039] 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 aluminum electrolytic capacitor characterized by: The application relates to 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 plurality of electrolytic paper layers, an aluminum foil layer, and a plurality of guide pins arranged on the aluminum foil layer; the aluminum foil layer is provided with a sandwich paper film at a position where the guide pins are arranged; the guide pins are arranged on the aluminum foil layer by riveting or riveting combined with ultrasonic welding; and the plurality of electrolytic paper layers and the aluminum foil layer provided with the guide pins are wound together to form the core package.

2. The aluminum electrolytic capacitor as claimed in claim 1, 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; the anode aluminum foil layer is riveted with positive guide pins, and the cathode aluminum foil layer is riveted with negative guide pins.

3. The aluminum electrolytic capacitor as claimed in claim 2, wherein: The sandwich paper film is arranged at a position where the positive guide pins are riveted on the anode aluminum foil layer and / or at a position where the negative guide pins are riveted on the cathode aluminum foil layer.

4. The aluminum electrolytic capacitor according to any one of claims 1 to 3, wherein: The sandwich paper film has a composite structure with a high-density dielectric layer and a low-density adsorption layer.

5. The aluminum electrolytic capacitor according to any one of claims 1 to 3, wherein: The electrolytic paper layer has a thickness of 40-70 um, and the electrolytic paper is a round-net double-layer composite paper or a round-net plus special-net double-layer composite paper.

6. The aluminum electrolytic capacitor according to any one of claims 1 to 3, wherein: The sandwich paper film is square, and the height of the sandwich paper film is less than or equal to the height of the anode aluminum foil layer and the cathode aluminum foil layer.

7. The aluminum electrolytic capacitor as claimed in claim 4, wherein: The composite density of the sandwich paper film of the composite structure is 0.65 g / cm 3 -0.85 g / cm 3 .

8. The aluminum electrolytic capacitor as claimed in claim 4, wherein: The sandwich paper film is a cotton-ramie thickening paper made by a round-net process and a long-net process.

9. The aluminum electrolytic capacitor as claimed in claim 2, wherein: The positive guide pins and the negative guide pins have the same structure; the positive guide pins comprise a flat sheet riveting part, and the height of the riveting part is less than the height of the sandwich paper film.

10. The aluminum electrolytic capacitor as claimed in claim 2, wherein: The positive guide pins and the negative guide pins have different structures; the thickness of the negative guide pins is 100-200 um, and the thickness of the cathode aluminum foil layer is 20-60 um.

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