Aluminum electrolytic capacitor with long service life

Abstract

An aluminum electrolytic capacitor with long service life comprises an aluminum shell, a core bag and a rubber plug, and the core bag is arranged in the shell in a sealed mode through the rubber plug. One end of the core package is provided with a liquid absorption pad made of electrolytic paper or silica gel, and electrolyte is absorbed on the liquid absorption pad. According to the utility model, the liquid absorption pad is arranged in the aluminum shell, so that when an oxidation film on the surface of the anode foil of the aluminum electrolytic capacitor is damaged, the aluminum electrolytic capacitor can generate heat; when the aluminum electrolytic capacitor emits heat, the electrolyte absorbed in the liquid absorption pad can be released, so that the electrolyte enters the core package to repair an oxidation film on the surface of the anode foil; therefore, the service life of the aluminum electrolytic capacitor is prolonged.

Description

Technical Field

[0001] The utility model relates to an aluminum electrolytic capacitor, in particular to an aluminum electrolytic capacitor with a long service life. Background Art

[0002] The core package of a liquid aluminum electrolytic capacitor is impregnated with electrolyte, and the main function of the electrolyte is to repair the oxide film on the surface of the anode foil. Different electrolyte impregnation methods result in different amounts of electrolyte impregnated on the core package; for example, when using the injection type impregnation, the impregnation of the electrolyte is insufficient, which easily leads to high product loss and high ESR.

[0003] When the amount of electrolyte impregnated on the core package of an aluminum electrolytic capacitor is small, during the long-term operation of the capacitor, due to the insufficient amount of electrolyte, problems such as large product loss and low capacitance occur in the short term. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an aluminum electrolytic capacitor with a long service life.

[0005] To solve the above technical problem, the technical solution proposed by the utility model is: an aluminum electrolytic capacitor with a long service life, including an aluminum shell, a core package and a rubber plug, the core package is hermetically arranged in the outer shell through the rubber plug; one end of the core package is provided with a liquid absorption pad made of electrolytic paper or silica gel, and the liquid absorption pad absorbs electrolyte.

[0006] For the above-mentioned aluminum electrolytic capacitor with a long service life, preferably, the liquid absorption pad is arranged between the bottom of the core package and the bottom of the aluminum shell.

[0007] For the above-mentioned aluminum electrolytic capacitor with a long service life, preferably, an explosion-proof valve is arranged at the bottom of the aluminum shell, and a through hole is arranged at the position corresponding to the explosion-proof valve on the liquid absorption pad.

[0008] For the above-mentioned aluminum electrolytic capacitor with a long service life, preferably, the liquid absorption pad is arranged at one end of the rubber plug, and through holes for the anode lead pin and the cathode lead pin to pass through are arranged on the liquid absorption pad.

[0009] For the above-mentioned aluminum electrolytic capacitor with a long service life, preferably, the thickness of the liquid absorption pad is within 2 mm.

[0010] For the above-mentioned aluminum electrolytic capacitor with a long service life, preferably, a hydrogen scavenger is absorbed on the liquid absorption pad.

[0011] Compared with the prior art, the advantages of the present utility model are as follows: A liquid absorption pad is arranged inside the aluminum shell of the present utility model. When the oxide film on the surface of the anode foil of the aluminum electrolytic capacitor is damaged, the aluminum electrolytic capacitor will heat up. When the aluminum electrolytic capacitor heats up, the electrolyte absorbed in the liquid absorption pad will be released, and then enter the core package to repair the oxide film on the surface of the anode foil, thereby achieving the effect of extending the service life of the aluminum electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic assembly structure diagram of the long-life aluminum electrolytic capacitor in Embodiment 1.

[0013] Figure 2 It is a schematic assembly structure diagram of the long-life aluminum electrolytic capacitor in Embodiment 2.

[0014] Figure 3 It is a schematic assembly structure diagram of the long-life aluminum electrolytic capacitor in Embodiment 3.

[0015] LEGEND DESCRIPTION

[0016] 1. Aluminum shell; 2. Core package; 3. Rubber plug; 4. Liquid absorption pad; 5. Explosion-proof valve; 6. Through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] For the convenience of understanding the present utility model, the following will describe the present utility model more comprehensively and meticulously in conjunction with the accompanying drawings of the specification and preferred embodiments. However, the protection scope of the present utility model is not limited to the following specific embodiments.

[0018] It should be particularly noted that when an element is described as "fixed to, fixedly connected to, connected to, or communicated with" another element, it can be directly fixed, fixedly connected, connected, or communicated to the other element, or indirectly fixed, fixedly connected, connected, or communicated to the other element through other intermediate connecting members.

[0019] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present utility model. Embodiment 1

[0020] As Figure 1 shown, a long-life aluminum electrolytic capacitor includes an aluminum shell 1, a core package 2, and a rubber plug 3. The core package 2 is hermetically arranged inside the outer shell through the rubber plug 3. One end of the core package 2 is provided with a liquid absorption pad 4 made of electrolytic paper or silica gel, and the liquid absorption pad 4 absorbs electrolyte and hydrogen scavenger. In this embodiment, the electrolyte absorbed on the liquid absorption pad 4 is the same as the electrolyte impregnated on the core package 2; the hydrogen scavenger can be common p-nitrophenol.

[0021] In this embodiment, the core package 2 is wound by an anode foil, electrolytic paper, and a cathode foil. An anode lead pin and a cathode lead pin are respectively riveted on the anode foil and the cathode foil. The anode lead pin and the cathode lead pin respectively pass through the rubber plug 3. In this embodiment, the electrolytic paper for making the liquid absorption pad is the same as the electrolytic paper inside the core package.

[0022] When the oxide film on the surface of the anode foil of the aluminum electrolytic capacitor is damaged, the aluminum electrolytic capacitor will heat up; when the aluminum electrolytic capacitor heats up, the electrolyte absorbed in the liquid absorption pad 4 will be released, and then enter the core package 2 to repair the oxide film on the surface of the anode foil; thus achieving the effect of extending the life of the aluminum electrolytic capacitor. And the leakage current of the aluminum electrolytic capacitor, that is, the ESR value, always exists. Under the action of the leakage current, the electrolysis of the electrolyte always exists, so hydrogen gas will be generated, resulting in gas swelling; the hydrogen scavenger can eliminate these hydrogen gases.

[0023] In this embodiment, the liquid absorption pad 4 is arranged between the bottom of the core package 2 and the bottom of the aluminum shell 1. The thickness of the liquid absorption pad 4 is 1.5 mm.

[0024] The aluminum electrolytic capacitor of this embodiment can supplement the electrolyte during long-term use, thereby extending the life of the aluminum electrolytic capacitor. Embodiment 2

[0025] In this embodiment, as Figure 2 shown, an explosion-proof valve 5 is arranged at the bottom of the aluminum shell 1, and a through hole 6 is arranged at the position of the explosion-proof valve 5 on the liquid absorption pad 4. Because if the liquid absorption pad 4 is not perforated, it will affect the opening of the explosion-proof valve 5; that is, the pressure inside the aluminum shell 1 reaches the opening value of the explosion-proof valve 5, but due to the existence of the liquid absorption pad 4, the pressure value acting on the explosion-proof valve 5 is reduced, thereby affecting the opening of the explosion-proof valve 5. In this embodiment, arranging a through hole 6 at the position of the explosion-proof valve 5 on the liquid absorption pad 4 well solves this problem. Other parts of this embodiment are the same as those of Embodiment 1. Embodiment 3

[0026] In this embodiment, as Figure 3 shown, the liquid absorption pad 4 is arranged at one end of the rubber plug 3, and through holes through which the anode lead pin and the cathode lead pin pass are arranged on the liquid absorption pad 4. Other parts of this embodiment are the same as those of Embodiment 1.

Claims

1. A long-life aluminum electrolytic capacitor, characterized in that: It comprises an aluminum shell, a core package and a rubber plug, wherein the core package is sealed in the shell through the rubber plug; a liquid absorbing pad made of electrolytic paper or silica gel is arranged at one end of the core package, and electrolyte is absorbed on the liquid absorbing pad.

2. The long-life aluminum electrolytic capacitor according to claim 1, characterized in that: The liquid absorbing pad is arranged between the bottom of the core package and the bottom of the aluminum shell.

3. The long-life aluminum electrolytic capacitor according to claim 2, characterized in that: An explosion-proof valve is arranged at the bottom of the aluminum shell, and a through hole is arranged at a position corresponding to the explosion-proof valve on the liquid-absorbing pad.

4. The long-life aluminum electrolytic capacitor according to claim 1, characterized in that: The liquid absorbing pad is arranged at one end of the rubber stopper, and a through hole through which the anode guide needle and the cathode guide needle pass is arranged on the liquid absorbing pad.

5. The long-life aluminum electrolytic capacitor according to any one of claims 1 to 4, characterized in that: The thickness of the liquid absorbing pad is within 2 mm.

6. The long-life aluminum electrolytic capacitor according to claim 1, characterized in that: The liquid absorbing pad absorbs the hydrogen remover.

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