Corrosion-resistant aluminum electrolytic capacitor

Abstract

A corrosion-resistant aluminum electrolytic capacitor comprises a shell, a core bag and a cover plate, the core bag is arranged in the shell in a sealed mode through the cover plate, and an anode leading-out terminal is arranged on the cover plate. The anode leading-out terminal comprises an anode external terminal and an anode rivet; after the anode guide chaff on the core bag is connected to the anode rivet, the top of the anode guide chaff extends to form an extension part, and the extension part is bent back and then welded to the bottom of the anode rivet. According to the utility model, the top of the anode guide chaff is extended and then bent back to be welded on the bottom of the anode rivet; when corrosion is generated, the corrosion is firstly generated on the section of the anode foil guide strip welded at the bottom of the anode rivet; and the section of anode guide chaff with capacity leading-out and conduction effects is not obviously influenced, so that the product performance is improved, and the failure rate of the product caused by corrosion is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of aluminum electrolytic capacitors, especially a kind of corrosion-resistant aluminum electrolytic capacitor. BACKGROUND

[0002] In the life of middle-high pressure bolt aluminum electrolytic capacitor or horn aluminum electrolytic capacitor, open circuit, low capacity, high loss and failure are usually caused by corrosion. Since the voltage is highest at the position of anode rivet of bolt aluminum electrolytic capacitor or horn aluminum electrolytic capacitor, and the rivet is in contact with the foil strip, the impurity content of the foil strip is higher, so corrosion usually occurs on the surface of the anode foil strip in contact with the anode rivet, causing the anode foil strip to break, resulting in low capacity, high loss and open circuit failure. SUMMARY

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a corrosion-resistant aluminum electrolytic capacitor.

[0004] To solve the above technical problems, the utility model provides a technical scheme: a corrosion-resistant aluminum electrolytic capacitor, comprising a shell, a core package and a cover plate, the core package is sealed in the shell by the cover plate, and an anode lead terminal is arranged on the cover plate; the anode lead terminal comprises an anode external terminal and an anode rivet; the anode foil strip on the core package is connected behind the anode rivet, the top of the anode foil strip is extended to form an extension, and the extension is welded on the bottom of the anode rivet after being bent back.

[0005] The corrosion-resistant aluminum electrolytic capacitor described above is preferably bent back to completely cover the bottom of the anode rivet.

[0006] The corrosion-resistant aluminum electrolytic capacitor described above is preferably provided with two washers at the lower part of the anode rivet, the washer close to the cover plate is sealed and connected between the anode external terminal on the anode rivet and the cover plate, and a preset hole is arranged on the anode foil strip and passes through the anode rivet between the two washers.

[0007] The corrosion-resistant aluminum electrolytic capacitor described above is preferably provided with a plurality of anode foil strips on the core package, and one of the plurality of anode foil strips is extended to form an extension.

[0008] The corrosion-resistant aluminum electrolytic capacitor described above is preferably provided with a plurality of anode foil strips on the core package, and one of the plurality of anode foil strips is extended to form an extension.

[0009] Compared with the prior art, the utility model discloses the advantages lie in: in the utility model, the top of anode foil strip is prolonged and then is back bent and is welded on the bottom of anode rivet, when corrosion occurs, corrosion will first occur on the section of anode foil strip welded on the bottom of anode rivet, and the section of anode foil strip for capacity lead-out and conduction will not be obviously affected, thereby improving product performance and reducing the failure rate of products caused by corrosion. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structural schematic view of the corrosion -resistant aluminum electrolytic capacitor in example 1.

[0011] Figure 2 It is the structural schematic view of the core package and anode lead-out terminal and cathode lead-out terminal connection in example 1.

[0012] Figure 3 It is the structural schematic view of the core package and anode lead-out terminal and cathode lead-out terminal connection in example 1 with multiple anode foil strips.

[0013] LEGEND

[0014] 1, shell, 2, core package, 3, cover plate, 31, rubber layer, 32, resin layer, 4, anode lead-out terminal, 41, anode external terminal, 42, anode rivet, 43, huasi, 5, cathode lead-out terminal, 6, anode foil strip, 61, extension, 7, cathode foil strip. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of the utility model, the following will be combined with the description and the preferred embodiments of the utility model more comprehensive, detailed description, but the protection scope of the utility model is not limited to the following specific embodiments.

[0016] Need to be particularly pointed out is, when certain element is described as " fixed on, fixed on, connected or communicated with " another element, it can be directly fixed, fixed, connected or communicated on another element, can also be indirectly fixed, fixed, connected or communicated on another element through other intermediate connecting piece.

[0017] Unless otherwise defined, all professional terms used in the following are the same as the meanings understood by those skilled in the art. The professional terms used in the present text are only for the purpose of describing specific embodiments, and are not intended to limit the protection scope of the utility model. Example 1

[0018] As Figure 1The corrosion-resistant cowhorn-shaped aluminum electrolytic capacitor shown in the figure comprises a shell 1, a core package 2 and a cover plate 3, the core package 2 is sealed in the shell 1 through the cover plate 3, and the cover plate 3 is provided with an anode lead-out terminal 4 and a cathode lead-out terminal 5. Figure 2 As shown in the figure, the anode lead-out terminal 4 comprises an anode external terminal 41 and an anode rivet 42; the anode foil strip on the core package 2 is connected behind the anode rivet 42, the top of the anode foil strip 6 is extended to form an extension 61, the extension 61 is bent back and welded on the bottom of the anode rivet 42; after the extension 61 is welded on the bottom of the anode rivet 42, the bottom of the anode rivet 42 is completely covered. The cathode foil strip 7 of the embodiment is electrically connected to the cathode lead-out terminal 5. In other embodiments, it can also be a bolt-shaped aluminum electrolytic capacitor.

[0019] In this embodiment, by extending the top of the anode foil strip 6 and then bending it back and welding it on the bottom of the anode rivet 42; when corrosion occurs, corrosion will first occur on the section of the anode foil strip 6 welded on the bottom of the anode rivet 42; and for capacity lead-out, the section of the anode foil strip 6 that functions as a conductor will not be significantly affected, thereby improving product performance and reducing the failure rate of the product due to corrosion.

[0020] In this embodiment, since the anode lead-out terminal 4 is connected to the positive electrode, only the top of the anode foil strip needs to be extended to form an extension, and the cathode lead-out terminal 5 can be designed according to the conventional design.

[0021] In this embodiment, the cover plate 3 comprises a rubber layer 31 and a resin layer 32, and the rubber layer 31 and the resin layer 32 are connected together by a sealing glue. In this embodiment, two washers 43 are arranged below the anode rivet 42 at the lower part of the resin layer 32, the washer 43 close to the cover plate 3 is in extrusion sealing connection with the anode rivet 42, and the anode foil strip 6 is provided with a preset hole which is arranged on the anode rivet 42 between the two washers 43.

[0022] In this embodiment, the end of the extension 61 can be arc-shaped to prevent the voltage on the tip of the extension 61 from being too high and causing rapid corrosion.

[0023] In this embodiment, as shown in the figure, in order to improve the large current impact resistance of the aluminum electrolytic capacitor, a plurality of anode foil strips 6 can be arranged on the core package 2, and one of the plurality of anode foil strips 6 is extended to form an extension 61. Figure 3 ​

Claims

1. A corrosion-resistant aluminum electrolytic capacitor, characterized by: It includes an outer shell, a core package and a cover plate. The core package is sealed in the outer shell through the cover plate, and the cover plate is provided with an anode lead terminal; the anode lead terminal includes an anode external terminal and an anode rivet; after the anode foil strip on the core package is connected to the anode rivet, the top of the anode foil strip is extended to form an extension part, and the extension part is bent back and welded to the bottom of the anode rivet.

2. The corrosion-resistant aluminum electrolytic capacitor according to claim 1, wherein: The extended portion completely covers the bottom of the anode rivet after being bent back.

3. The corrosion-resistant aluminum electrolytic capacitor according to claim 1, wherein: Two washers are provided at the lower part of the anode rivet. The washer close to the cover plate and the anode rivet ensure a sealed connection between the anode external terminal on the anode rivet and the cover plate. A preset hole is provided on the anode foil strip, and the preset hole is passed through the anode rivet between the two washers.

4. The corrosion-resistant aluminum electrolytic capacitor according to any one of claims 1 to 3, characterized in that: A plurality of anode foil strips are arranged on the core package, and one of the plurality of anode foil strips is extended to form an extension portion.

5. The corrosion-resistant aluminum electrolytic capacitor according to any one of claims 1 to 3, characterized in that: The end of the extension portion is configured to be arc-shaped.

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