Aluminum electrolytic capacitor

Abstract

An aluminum electrolytic capacitor comprises a shell, a core package and a sealing piece, the core package is arranged in the shell in a sealed mode through the sealing piece, the core package is formed by winding an anode foil, electrolytic paper and a cathode foil, and the anode foil is electrically connected with an anode guide foil strip or an anode guide pin; the cathode foil is electrically connected with a cathode guide foil strip or a cathode guide pin; a cathode pad foil is arranged on the cathode guide chaff or the cathode guide pin, and the cathode pad foil covers the electrical connection part of the cathode guide chaff or the cathode guide pin and the cathode foil; the cathode pad foil extends out of the bottom of the core package and contacts with the inner wall of the bottom of the housing. According to the aluminum electrolytic capacitor, heat generated in the core cladding can be transmitted to the shell through the cathode pad foil, so that heat dissipation of the core cladding is accelerated, the ripple resistance of the aluminum electrolytic capacitor is improved, and the service life of the aluminum electrolytic capacitor is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to an aluminum electrolytic capacitor, especially a fast heat dissipation aluminum electrolytic capacitor. BACKGROUND

[0002] Due to the inherent characteristics of the manufacturing material, when the aluminum electrolytic capacitor encounters a ripple current, the core package inside the capacitor will heat up, and the temperature at the center of the core package is the highest; when the core package heats up to a certain extent, it will cause the electrolyte to expand and the explosion-proof valve to open, resulting in the failure of the capacitor or the appearance of the product with a bulging shell. How to promptly dissipate the heat generated by the core package is a problem that the aluminum electrolytic capacitor industry has been seeking to solve. SUMMARY

[0003] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide an aluminum electrolytic capacitor with good heat dissipation performance.

[0004] To solve the above technical problems, the utility model provides a technical scheme: an aluminum electrolytic capacitor, comprising a shell, a core package, and a sealing element, the core package is sealed in the shell by the sealing element, the core package is wound to form by an anode foil, electrolytic paper, and a cathode foil, the anode foil is electrically connected with an anode foil strip or an anode needle, the cathode foil is electrically connected with a cathode foil strip or a cathode needle, the cathode foil strip or the cathode needle is provided with a cathode pad foil, the cathode pad foil covers the electrical connection part of the cathode foil strip or the cathode needle and the cathode foil, and the bottom of the cathode pad foil extending out of the core package is in contact with the inner wall of the bottom of the shell.

[0005] In the utility model, because the cathode pad foil is arranged in the core package, the cathode pad foil extends out of the core package and is in contact with the shell, so that the heat generated in the core package can be transmitted to the shell through the cathode pad foil, thereby accelerating the heat dissipation of the core package and ensuring the service life of the aluminum electrolytic capacitor.

[0006] In the utility model, the sealing element can be a rubber plug, a cover plate of a horn capacitor, or a cover plate of a bolt capacitor; that is, the aluminum electrolytic capacitor in the utility model can be a lead-type aluminum electrolytic capacitor, a horn-type aluminum electrolytic capacitor, or a bolt-type aluminum electrolytic capacitor.

[0007] The aluminum electrolytic capacitor described above is preferably provided with a cathode pad foil extending out of the bottom of the core package by 1-2 mm. In the utility model, after the winding of the core package is completed, part of the electrolytic paper of the product will extend out of the bottom of the core package, so the length of the cathode pad foil extending out of the bottom of the core package should be greater than the length of the electrolytic paper extending out of the bottom of the core package, and the length of the electrolytic paper extending out of the bottom of the core package should not exceed 2 mm.

[0008] Preferably, in the aforementioned aluminum electrolytic capacitor, the cathode pad foil is connected to the cathode foil and the cathode conductive strip, or the cathode pad foil is connected to the cathode foil and the cathode conductive pin, by cold riveting. In this invention, the cathode conductive strip and the cathode foil are generally electrically connected by riveting. After riveting, burrs will appear on the riveting surface, and the thickness of the cathode conductive strip itself makes the electrolytic paper at the edge of the cathode conductive strip easily damaged during core winding, leading to a short circuit. In this invention, the cathode conductive strip is made of aluminum foil; during core winding, the edge of the cathode conductive strip inside the core bundle has a knife-like structure; under the winding tension, the electrolytic paper at the edge of the cathode conductive strip is easily damaged, leading to a short circuit. In this invention, the cathode pad foil is cold-riveted to the cathode foil and the cathode conductor foil strip, which reduces the blade effect. This is because the thickness of the pad foil is generally smaller than the thickness of the cathode conductor foil strip. In addition, the cathode pad foil does not need to be riveted to the cathode foil or connected to the lead-out terminal. Therefore, the pad foil can be made of aluminum material, which is more flexible than the cathode conductor foil strip.

[0009] In the aforementioned aluminum electrolytic capacitor, preferably, the electrolytic paper extends 1-2 mm beyond the top of the core package. This 1-2 mm extension allows for better isolation of the anode and cathode foils at the top of the core package.

[0010] Preferably, in the aforementioned aluminum electrolytic capacitor, an anode pad is provided on the anode conductive foil strip or anode conductive pin, the anode pad covering the electrical connection between the anode conductive foil strip and the anode foil. The anode pad can cover the burrs generated during the riveting of the anode conductive foil strip or anode conductive pin, preventing short circuits.

[0011] In the aforementioned aluminum electrolytic capacitor, preferably, the anode pad extends 1-2 mm beyond the top of the core package. This extension of the anode pad further isolates the anode foil and cathode foil at the top of the core package.

[0012] Compared with the prior art, the advantages of this utility model are: the aluminum electrolytic capacitor of this utility model can transfer the heat generated inside the core to the outer shell through the cathode pad foil, thereby accelerating the heat dissipation of the core and improving the ripple resistance and service life of the aluminum electrolytic capacitor. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the aluminum electrolytic capacitor in Example 1.

[0014] Figure 2 This is a schematic diagram of the core package after it has been unfolded in Example 1.

[0015] Legend

[0016] 1. Outer shell; 2. Core package; 21. Anode foil; 22. Electrolytic paper; 23. Cathode foil; 24. Cathode pad foil; 25. Anode pad paper; 26. Anode conductive foil strip; 27. Cathode conductive foil strip; 3. Cover plate; 4. Anode terminal; 5. Cathode terminal. Detailed Implementation

[0017] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0018] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0019] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention. Example 1

[0020] like Figure 1 The illustrated aluminum electrolytic capacitor is a horn-shaped type, comprising an aluminum casing 1, a core 2, and a sealing element. The core 2 is sealed within the casing 1 by a cover plate 3. The core 2 is formed by winding an anode foil 21, electrolytic paper 22, and a cathode foil 23. An anode conductive strip 26 is electrically connected to the anode foil 21; a cathode conductive strip 27 is electrically connected to the cathode foil 23; a cathode pad foil 24 is disposed on the cathode conductive strip 27, covering the electrical connection between the cathode conductive strip 27 and the cathode foil 23; the cathode pad foil 24 extends out from the bottom of the core 2 and contacts the inner wall of the bottom of the casing 1. The anode conductive strip 26 and the cathode conductive strip 27 are respectively connected to the anode terminal 4 and the cathode terminal 5 on the cover plate 3.

[0021] In this embodiment, the top of the core package 2 refers to the end of the anode conductive foil strip 26 and the cathode conductive foil strip 27 extending from the core package 2, and the bottom of the core package 2 refers to the other end of the anode conductive foil strip 26 and the cathode conductive foil strip 27 facing each other.

[0022] In this embodiment, the length of the cathode foil 24 is about 2 cm, and the cathode foil 24 extends 1.5 mm beyond the bottom of the core package 2; in other embodiments, the length of the cathode foil 24 extending beyond the bottom of the core package 2 can be selected between 1 and 2 mm depending on the situation.

[0023] In the embodiment, the cathode pad foil 24 extends from the bottom of the core pack 2 and contacts the inner wall of the bottom of the shell 1, so that the heat generated in the core pack 2 can be quickly transferred from the cathode pad foil 24 to the shell 1 to dissipate, thereby ensuring the ripple resistance of the aluminum electrolytic capacitor. At the same time, in the aging process of the aluminum electrolytic capacitor, when repairing the oxide film on the surface of the anode foil 21, the temperature in the core pack 2 can be quickly raised to a preset temperature, such as 80°C; at this preset temperature, the lattice structure of the oxide film formed on the surface of the anode foil 21 during the aging process is the most suitable.

[0024] In the embodiment, the cathode pad foil 24 is connected with the cathode foil 23 and the cathode lead foil strip 27 by cold riveting, and the cathode pad foil 24 completely covers the part where the cathode lead foil strip 27 is connected with the cathode foil 23. In the embodiment, the thickness of the cathode lead foil strip 27 is 200 μm, and the thickness of the cathode pad foil 24 is only about half of the thickness of the cathode lead foil strip 27. Therefore, during winding, under the action of the winding tension, the knife-edge effect of the cathode pad foil 24 is lower than that of the cathode lead foil strip 27, and the electrolytic paper 22 is not easy to be damaged, thereby reducing the possibility of short circuit. In other embodiments, such as the lead-type aluminum electrolytic capacitor, the thickness of the aluminum tongue for riveting the cathode lead pin with the cathode foil 23 is generally ≥230 μm, which is much larger than the thickness of the cathode lead foil strip 27 in the embodiment. At this time, the cathode pad foil 24 has a better effect on reducing the knife-edge effect.

[0025] In the embodiment, the electrolytic paper 22 can extend 1-2 mm from the top of the core pack 2; thereby ensuring the effective isolation of the anode foil 21 and the cathode foil 23 at the top of the core pack 2.

[0026] In the embodiment, the anode pad paper 25 is arranged on the anode lead foil strip 26 or the anode lead pin, the anode pad paper 25 covers the electrical connection part of the anode lead foil strip 26 and the anode foil 21, and the anode pad paper 25 extends 1-2 mm from the top of the core pack 2; in this way, the anode pad paper 25 further electrically isolates the anode foil 21 and the cathode foil 23 at the top of the core pack 2.

Claims

1. An aluminum electrolytic capacitor characterized by: The application relates to a battery, which comprises a shell, a core package and a sealing member, the core package is sealedly arranged in the shell through the sealing member, the core package is wound by an anode foil, electrolytic paper and a cathode foil, an anode lead foil strip or an anode lead pin is electrically connected to the anode foil, a cathode lead foil strip or a cathode lead pin is electrically connected to the cathode foil, a cathode pad foil is arranged on the cathode lead foil strip or the cathode lead pin, the cathode pad foil covers the electrically connecting part of the cathode lead foil strip or the cathode lead pin and the cathode foil, and the cathode pad foil extends from the bottom of the core package to contact the inner wall of the bottom of the shell.

2. The aluminum electrolytic capacitor according to claim 1, characterized by: The cathode pad foil extends from the bottom of the core package by 1-2 mm.

3. The aluminum electrolytic capacitor according to claim 1, characterized by: The cathode pad foil is connected with the cathode foil and the cathode lead foil strip or the cathode pad foil is connected with the cathode foil and the cathode lead pin through cold riveting.

4. The aluminum electrolytic capacitor according to any one of claims 1 to 3, characterized by: The electrolytic paper extends from the top of the core package by 1-2 mm.

5. The aluminum electrolytic capacitor according to any one of claims 1 to 3, characterized by: An anode pad paper is arranged on the anode lead foil strip or the anode lead pin, and the anode pad paper covers the electrically connecting part of the anode lead foil strip and the anode foil.

6. The aluminum electrolytic capacitor according to claim 5, characterized by: The anode pad paper extends from the top of the core package by 1-2 mm.

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