Aluminum electrolytic capacitor

Abstract

The utility model provides an aluminum electrolytic capacitor, and aims to solve the technical problem that halogen ions gradually permeate into a contact surface between an aluminum stem and a rubber plug along with the increase of the service life of the conventional aluminum electrolytic capacitor, so that electrolyte leaks after the capacitor is corroded. The aluminum electrolytic capacitor comprises a core package, a guide pin, an isolation plate and a shell. The guide pin is electrically connected to the core package in a matching manner. The guide pin comprises an aluminum tongue, an aluminum stem and a lead. The aluminum stem is connected between the aluminum tongue and the lead. The isolation plate is installed in the housing, and one end of the isolation plate towards the aluminum tongue is connected with a protection block. The lead penetrates through the protection block to be exposed out of the shell. And the aluminum stem is hermetically connected in the protection block. According to the aluminum electrolytic capacitor, the protection block is arranged in the direction, facing the aluminum tongue, of the isolation plate, and the sealing rings are arranged on the end face and the outer side wall, facing the lead, of the aluminum stem arranged in the protection block in a sleeving mode, so that leakage of electrolyte is effectively avoided, and the service life of the aluminum electrolytic capacitor is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of capacitors, and in particular to the field of aluminum electrolytic capacitors. Background Art

[0002] Aluminum electrolytic capacitors are energy storage components that can be divided into four categories: leaded aluminum electrolytic capacitors, horn-type aluminum electrolytic capacitors, bolt-type aluminum electrolytic capacitors, and solid aluminum electrolytic capacitors. Among them, the most used are leaded aluminum electrolytic capacitors. Due to the advantages of small size, large capacity and low price, leaded aluminum electrolytic capacitors are widely used in the bypass of electronic equipment, coupling circuits, speaker system circuits and other fields.

[0003] In the past decade, with the increasing demand for aluminum electrolytic capacitors, life reliability has become a top priority for aluminum electrolytic capacitors, and how to prevent product corrosion and failure has become a research direction for major manufacturers. In the process of capacitor preparation, it is inevitable that flux, solvents (cleaning agents, fixatives, coating agents) and the like containing halogens will remain on the capacitors. These halides may penetrate the inside of the capacitor through the sealing material. As the service life of the capacitor increases, the halogen ions gradually penetrate into the contact surface between the aluminum stem and the rubber plug, corroding the aluminum stem and creating a gap between the aluminum stem and the rubber plug, thereby causing leakage of the electrolyte in the aluminum electrolytic capacitor. CN202320281206.0 discloses an anti-corrosion aluminum electrolytic capacitor, wherein a 5-20μm thick anti-corrosion film is provided on the stem, and the anti-corrosion film prevents the halogen ions from corroding the aluminum stem.

[0004] Publication number: CN219435713U, name: "A corrosion-resistant aluminum electrolytic capacitor", announcement date: July 28, 2023. Summary of the invention

[0005] The utility model aims to provide an aluminum electrolytic capacitor, which can prevent halogen ions from corroding the inside of the capacitor and greatly prolong the service life of the capacitor.

[0006] The technical solution adopted by the utility model is:

[0007] An aluminum electrolytic capacitor comprises a core package, a guide pin, an isolation plate and a shell;

[0008] A guide pin is matched and electrically connected to the core package; the guide pin comprises an aluminum tongue, an aluminum stem and a lead wire; the aluminum stem is connected between the aluminum tongue and the lead wire;

[0009] The isolation plate is installed in the housing, and one end of the isolation plate facing the aluminum tongue is connected to a protection block;

[0010] The lead wire passes through the protection block until it is exposed from the housing; the aluminum stem is sealed and connected inside the protection block.

[0011] Furthermore, the isolation plate is penetrated by two through holes; the protection block matching the through hole is matched and connected to one end of the isolation plate facing the aluminum tongue; the protection block is penetrated by a mounting hole coaxial with the through hole.

[0012] Furthermore, a sealing ring is sleeved on the end surface of the aluminum stem facing the lead direction and a partial outer wall; the aluminum stem is arranged in the protection block; the sealing ring sleeved on the outer wall of the aluminum stem abuts against the inner wall of the protection block.

[0013] Furthermore, the height of the aluminum stem is equal to the height of the protection block.

[0014] Furthermore, the core package is formed by winding an anode foil, an electrolytic paper and a cathode foil; the electrolytic paper is arranged between the anode foil and the cathode foil, and the anode foil and the cathode foil are both equal in width and length to the electrolytic paper.

[0015] Furthermore, an end surface of one end of the aluminum tongue is in an arc shape.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] A protective block is provided on the isolation plate toward the aluminum tongue, and a sealing ring is sleeved on the end face and outer wall of the aluminum stem in the protection block toward the lead wire. At this time, the sealing ring provided on the end face of the aluminum stem toward the lead wire can prevent the halogen ions from corroding the end face of the aluminum stem. At the same time, when the lead wire passes through the protection block to the exposed shell, the sealing ring sleeved on the outer wall of the aluminum stem abuts against the inner wall of the protection block, which can prevent the halogen ions from corroding the junction of the aluminum stem and the isolation plate, effectively avoiding the leakage of the electrolyte, which is conducive to extending the service life of the aluminum electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure in which a guide pin of an aluminum electrolytic capacitor is installed on an isolation plate according to an embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of an isolation plate of an aluminum electrolytic capacitor according to an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of a guide pin of an aluminum electrolytic capacitor according to an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of an aluminum electrolytic capacitor according to an embodiment of the present application.

[0023] Reference numerals:

[0024] 1. Cathode guide pin; 10. Aluminum tongue; 11. Aluminum stem; 12. Lead wire; 13. Sealing ring;

[0025] 2. Anode guide pin; 3. Isolation plate;

[0026] 4. Protective block; 41. Mounting hole;

[0027] 5. Shell. DETAILED DESCRIPTION

[0028] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0029] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships conventionally placed when the product of the utility model is used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0032] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0033] The embodiment of the utility model provides an aluminum electrolytic capacitor, which includes a core package, a guide pin, an outer shell 5 and an isolation plate 3. A protective block 4 is provided on the isolation plate 3 toward the aluminum tongue 10, and a sealing ring 13 is sleeved on the end face and outer wall of the aluminum stem 11 in the protective block 4 toward the lead 12. At this time, the sealing ring 13 provided at the bottom end of the aluminum stem 11 can prevent the halogen ions from corroding the end face of the aluminum stem 11. At the same time, when the lead 12 passes through the protective block 4 to the outer shell, the sealing ring 13 sleeved on the outer wall of the aluminum stem 11 abuts against the inner wall of the protective block 4, which can prevent the halogen ions from corroding the junction of the aluminum stem 11 and the isolation plate 3.

[0034] Specifically,

[0035] The core package is wound with anode foil, electrolytic paper and cathode foil. The electrolytic paper is arranged between the anode foil and the cathode foil, and the anode foil and the cathode foil are both of the same width and length as the electrolytic paper.

[0036] Guide needle, such as Figure 1 or Figure 3 or Figure 4 As shown, it includes an anode guide pin 2 and a cathode guide pin 1. Taking the cathode guide pin 1 as an example, the cathode guide pin 1 includes an aluminum tongue 10, an aluminum stem 11 and a lead wire 12. The end surface of one end of the aluminum tongue 10 is in an arc shape and can be inserted into the gap between the cathode foil and the electrolytic paper. The aluminum stem 11, one end of which is connected to the other end of the aluminum tongue 10. A sealing ring 13 is provided at the bottom of the aluminum stem 11 (the end facing the lead wire 12) and a part of the outer wall. The sealing ring 13 first passes through the lead wire 12 and is sleeved on the bottom end surface of the aluminum stem 11 and a part of the outer wall. The lead wire 12, one end of which is connected to the other end of the aluminum stem 11.

[0037] Isolation plate 3, such as Figure 2 or Figure 4As shown, it has two through holes. A protective block 4 matching the through hole is connected to the top of the isolation plate 3 (the end facing the aluminum tongue 10). That is, the protective block 4 is arranged at the through hole. The protective block 4 is penetrated by a mounting hole 41 coaxial with the through hole. The aluminum stem 11 is matched and arranged in the protective block 4, that is, the height of the aluminum stem 11 is equal to the height of the protective block 4, and the diameter of the aluminum stem 11 is slightly smaller than the inner diameter of the protective block 4. Two isolation plates 3 are provided, which are respectively arranged at the top and bottom of the core package.

[0038] The aluminum tongue 10 is electrically connected to the core package, and the isolation plate 3 is installed on the guide pin, so that the lead wire 12 of the guide pin passes through the installation hole 41 of the protection block 4 and the through hole of the isolation plate 3 in sequence. At this time, the sealing ring 13 sleeved on the outer wall of the aluminum stem 11 abuts against the protection block 4.

[0039] The shell 5 has a core package and a separator 3 installed therein. That is, the core package is arranged in a closed space enclosed by the shell 5 and the separator 3. An electrolyte is also arranged in the closed space, so that the core package is immersed in the closed space. When the guide pin passes through the mounting hole 41, the sealing ring 13 arranged at the bottom end of the aluminum stem 11 can prevent the halogen ions from corroding the end face of the aluminum stem 11, and the sealing ring 13 sleeved on the outer wall of the aluminum stem 11 abuts against the inner wall of the protective block 4, which can prevent the halogen ions from corroding the junction between the aluminum stem 11 and the separator 3.

[0040] One end of the cathode guide pin 1 is inserted into the gap between the cathode foil and the electrolytic paper, and the other end thereof passes through the mounting hole 41 and the through hole in turn, so that the lead wire 12 can be exposed from the outer shell 5. The specific installation method is as follows: the aluminum tongue 10 of the cathode guide pin 1 is inserted into the gap between the cathode foil and the electrolytic paper, and the sealing ring 13 is passed through the lead wire 12 and sleeved on the bottom end and partial outer wall of the aluminum stem 11. Then install the isolation plate 3 at the bottom of the outer shell 5, so that the lead wire 12 of the guide pin passes through the mounting hole 41 of the protection block 4 and the through hole of the isolation plate 3 in turn, until the lead wire 12 of the guide pin can be exposed from the outer shell 5 of the capacitor. At this time, the sealing ring 13 sleeved on the outer wall of the aluminum stem 11 abuts against the inner wall of the protection block 4.

[0041] Based on the above embodiments, the utility model has the following advantages:

[0042] A protective block 4 is provided in the direction of the aluminum tongue 10 on the isolation plate 3, and a sealing ring 13 is sleeved on the end surface and outer wall of the aluminum stem 11 in the protection block 4 facing the lead 12. At this time, the sealing ring 13 provided on the end surface of the aluminum stem 11 facing the lead 12 can prevent the halogen ions from corroding the end surface of the aluminum stem 11. At the same time, when the lead 12 passes through the protection block 4 to the exposed shell 5, the sealing ring 13 sleeved on the outer wall of the aluminum stem 11 abuts against the inner wall of the protection block 4, which can prevent the halogen ions from corroding the junction of the aluminum stem 11 and the isolation plate 3, effectively avoiding the leakage of the electrolyte, which is conducive to extending the service life of the aluminum electrolytic capacitor.

Claims

1. An aluminum electrolytic capacitor, characterized in that: The aluminum electrolytic capacitor comprises a core package, a guide pin, an isolation plate and a shell; A guide pin, electrically connected to the core package; the guide pin comprises an aluminum tongue, an aluminum stem and a lead wire; The aluminum stem is connected between the aluminum tongue and the lead; The isolation plate is installed in the housing, and one end of the isolation plate facing the aluminum tongue is connected to a protection block; The lead wire passes through the protection block until it is exposed from the housing; The aluminum stem is sealed and connected in the protection block.

2. The aluminum electrolytic capacitor according to claim 1, characterized in that: The isolation plate is penetrated by two through holes; the protection block matching the through hole is matched and connected to one end of the isolation plate facing the aluminum tongue; the protection block is penetrated by a mounting hole coaxial with the through hole.

3. The aluminum electrolytic capacitor according to any one of claims 1 or 2, characterized in that: The end surface and outer wall of the aluminum stem facing the lead direction are sleeved with a sealing ring; the aluminum stem is arranged in the protection block; the sealing ring sleeved on the outer wall of the aluminum stem abuts against the inner wall of the protection block.

4. The aluminum electrolytic capacitor according to claim 3, characterized in that: The height of the aluminum stem is equal to the height of the protection block.

5. The aluminum electrolytic capacitor according to any one of claims 1, 2 or 4, characterized in that: The core package is formed by winding an anode foil, an electrolytic paper and a cathode foil; the electrolytic paper is arranged between the anode foil and the cathode foil, and the anode foil and the cathode foil are both of the same width and length as the electrolytic paper.

6. The aluminum electrolytic capacitor according to any one of claims 1, 2 or 4, characterized in that: An end surface of one end of the aluminum tongue is in an arc shape.

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