CN218241602U

CN218241602U - Aluminum electrolytic capacitor with novel packaging structure

Info

Publication number: CN218241602U
Application number: CN202221999435.8U
Authority: CN
Inventors: 许雷冰; 刘毅
Original assignee: Hunan Aihua Group Co Ltd
Current assignee: Hunan Aihua Group Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2023-01-06
Anticipated expiration: 2032-08-01

Abstract

An aluminum electrolytic capacitor with a novel packaging structure comprises a shell, a core package and a sealing cover; the core bag is hermetically arranged in the shell through a sealing cover; the core bag is formed by winding an anode foil, electrolytic paper and a cathode foil, wherein the anode foil and the cathode foil respectively extend out of the upper end and the lower end of the core bag; the anode foil and the cathode foil which extend out of the core bag are respectively in electrical contact with the sealing cover and the bottom of the shell; an insulating film is arranged between the sealing cover and the shell, and the sealing cover is connected with the shell in a sealing mode. The utility model discloses in, positive pole paper tinsel and negative pole paper tinsel are stretched out at the both ends of core respectively, thereby stretch out drawing forth of positive pole with sealed lid electric connection realization positive pole of core, thereby and stretch out drawing forth of negative pole paper tinsel direct and the realization negative pole of shell bottom electric connection of core, thereby just so avoided the use of traditional aluminum electrolytic capacitor rubber buffer or mass flow body to further improve aluminum electrolytic capacitor's capacity volume ratio.

Description

Aluminum electrolytic capacitor with novel packaging structure

Technical Field

The utility model relates to an aluminum electrolytic capacitor, in particular to an aluminum electrolytic capacitor with a novel packaging structure, which is sealed without a rubber plug.

Background

The traditional aluminum electrolytic capacitor has the structure that the core bag is sealed in the shell through the rubber plug, but the sealing effect of the core bag is not ideal when the core bag is sealed through the rubber plug, and most of the capacitor failures are dry failures caused by low sealing effect of the rubber plug. In actual production, because the shell at the position of the rubber plug needs to be sealed at the waist, the thickness of the rubber plug is larger, so that the prepared aluminum electrolytic capacitor is larger in length and does not accord with the development trend of miniaturization of the current capacitor. In order to solve the problem, the patent No. 2022214886427 discloses an aluminum electrolytic capacitor with a novel lead-out structure, which uses an insulating sealing cover to replace a rubber plug of a traditional aluminum electrolytic capacitor, so as to realize the improvement of the volume ratio of the capacity of the aluminum electrolytic capacitor; however, the leading-out of the anode in the technical solution provided in this patent needs to depend on the anode current collector, and the pure anode current collector makes the preparation process of the aluminum electrolytic capacitor complicated, and the cost also increases.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an aluminum electrolytic capacitor with a novel packaging structure which is not sealed by a rubber plug; the anode of the aluminum electrolytic capacitor is directly led out through the sealing cover, and the cathode is directly led out through the aluminum shell.

In order to solve the technical problem, the utility model provides a technical scheme does: an aluminum electrolytic capacitor with a novel packaging structure comprises a shell, a core package and a sealing cover; the core bag is hermetically arranged in the shell through a sealing cover; the core bag is formed by winding an anode foil, electrolytic paper and a cathode foil, wherein the anode foil and the cathode foil respectively extend out of the upper end and the lower end of the core bag; the anode foil and the cathode foil which extend out of the core bag are respectively in electrical contact with the sealing cover and the bottom of the shell; an insulating film is arranged between the sealing cover and the shell, and the sealing cover is connected with the shell in a sealing mode.

Preferably, the sealing cover is hermetically connected with the insulating film through insulating glue, and the shell is sealed with the insulating film through insulating glue.

In the above aluminum electrolytic capacitor with the novel packaging structure, preferably, the insulating film is extruded between the sealing cover and the shell, and the sealing cover and the shell seal the core package in the shell by extruding the insulating film.

In the above aluminum electrolytic capacitor with a novel packaging structure, preferably, the insulating film is extruded between the sealing cover and the housing through a beam waist; the number of the corset is one, two or three.

Preferably, the sealing cover and the shell are hermetically connected with the insulating film through insulating glue.

Preferably, the sealing cover and the shell are respectively provided with an anode terminal and a cathode terminal.

In the aluminum electrolytic capacitor with the novel packaging structure, preferably, the anode foil extending out of the core package and the sealing cover are welded together by heating the sealing cover.

Preferably, the cathode foil extending out of the core package and the bottom of the casing are welded together by heating the bottom of the casing.

Preferably, the anode foil extending out of the core package is electrically connected with the sealing cover through a conductive adhesive.

Preferably, the cathode foil extending out of the core package is electrically connected with the bottom of the shell through a conductive adhesive.

Compared with the prior art, the utility model has the advantages of: the utility model discloses in, positive pole paper tinsel and negative pole paper tinsel are stretched out at the both ends of core respectively, thereby stretch out drawing forth of positive pole with sealed lid electric connection realization positive pole of core, thereby and stretch out drawing forth of negative pole paper tinsel direct and the realization negative pole of shell bottom electric connection of core, thereby just so avoided the use of traditional aluminum electrolytic capacitor rubber buffer or mass flow body to further improve aluminum electrolytic capacitor's capacity volume ratio. Simultaneously the utility model discloses well adoption insulating film will seal the lid and the shell is insulating to thereby seal through insulating glue or beam waist and guarantee the gas tightness between sealed lid and the shell.

Drawings

Fig. 1 is a schematic structural diagram of an aluminum electrolytic capacitor having a novel package structure in example 1.

Fig. 2 is a schematic sectional structure view of an aluminum electrolytic capacitor having a novel package structure in example 1.

Fig. 3 is a schematic view showing the structure of a corset between the sealing cover and the housing in example 1.

Fig. 4 is a schematic structural diagram of the core package in embodiment 1.

Fig. 5 is an enlarged schematic view of a portion a of fig. 4.

Description of the figures

1. A housing; 2. a core package; 21. An anode foil; 22. electrolyzing paper; 23. a cathode foil; 3. a sealing cover; 4. an insulating film; 5. girdling; 6. an anode terminal; 7. and a cathode terminal.

Detailed Description

To facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.

It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Example 1

An aluminum electrolytic capacitor with a novel packaging structure as shown in fig. 1 comprises a shell 1, a core package 2 and a sealing cover 3; the core pack 2 is sealingly arranged in the housing 1 by means of a sealing cover 3. As shown in fig. 2, the core pack 2 is formed by winding an anode foil 21, an electrolytic paper 22 and a cathode foil 23, and the anode foil 21 and the cathode foil 23 protrude from the upper end and the lower end of the core pack 2, respectively. As shown in fig. 1, the anode foil 21 and the cathode foil 23 extending out of the core pack 2 are in electrical contact with the sealing cover 3 and the bottom of the case 1, respectively. The cut section of the anode foil 21 after cutting is free from a dense oxide film, and the anode foil 21 extending out of the core package 2 is in contact with the sealing cover 3 to form the cut end face of the anode foil 21. An insulating film 4 is arranged between the sealing cover 3 and the shell 1, and the sealing cover 3 is connected with the shell 1 in a sealing mode. In the present embodiment, the sealing cap 3 and the case 1 are provided with an anode terminal 6 and a cathode terminal 7, respectively; the anode led out from the sealing cover 3 is connected to a circuit board through an anode terminal, and the cathode led out from the housing 1 is connected to the circuit board through a cathode terminal 7.

In the present embodiment, the insulating film 4 is pressed between the sealing cover 3 and the case 1, and the sealing cover 3 and the case 1 seal the core pack 2 inside the case 1 by pressing the insulating film 4. In the embodiment, the sealing cover 3 and the shell 1 extrude the insulating film 4 in a way of a beam waist 5, and two beam waists 5 are arranged for ensuring the sealing property; in other embodiments, one corset 5 or three corsets 5 are possible. In order to further improve the air tightness of the aluminum electrolytic capacitor of the embodiment, the sealing cover 3 and the housing 1 are hermetically connected with the insulating film 4 through insulating glue. In the embodiment, the sealing cover 3 and the shell 1 are both made of aluminum material; in this embodiment, the sealing cover 3 is separated from the housing 1 by the insulating film 4, so that the sealing cover 3 and the housing 1 are not electrically short-circuited. The insulating film 4 may be made of polypropylene, polyethylene or polytetrafluoroethylene.

In the present embodiment, in order to prevent the poor contact or disconnection between the anode foil 21 and the sealing cover 3 due to the oxidation of the sealing cover 3, the anode foil 21 protruding out of the core pack 2 and the sealing cover 3 are welded together by laser heating the sealing cover 3. After the aluminum electrolytic capacitor of the present embodiment is packaged, the contact portion between the sealing lid 3 and the anode foil 21 protruding from the core pack 2 is heated from the outside, so that the sealing lid 3 and the anode foil 21 are slightly melted and welded together. The cathode foil 23 protruding from the core pack 2 and the bottom of the outer can 1 can be welded together by heating the bottom of the outer can 1 in the same manner.

In this embodiment, the anode foil 21 and the cathode foil 23 respectively extend out from two ends of the core package 2, the anode foil 21 extending out of the core package 2 is electrically connected with the sealing cover 3 to realize the leading-out of the anode, and the cathode foil 23 extending out of the core package 2 is directly electrically connected with the bottom of the shell 1 to realize the leading-out of the cathode, so that the use of a rubber plug or a current collector of the traditional aluminum electrolytic capacitor is avoided, and the volume ratio of the capacity of the aluminum electrolytic capacitor is further improved. Simultaneously the utility model discloses in adopt insulating film 4 will seal lid 3 and shell 1 insulating to thereby seal through insulating glue or beam waist 5 between sealed lid 3 and the shell 1 and guarantee the gas tightness.

Example 2

In the present embodiment, the sealing cover 3 and the housing 1 are hermetically connected to the insulating film 4 by an insulating glue. That is, the sealing cover 3 and the insulating film 4 are connected by the insulating glue in a sealing manner, and the housing 1 and the insulating film 4 are sealed by the insulating glue. The present embodiment does not provide that the corset 5 directly connects the sealing cover 3 with the housing 1 by means of the insulating glue. The other portions of this example are the same as example 1.

Example 3

In the embodiment, the anode foil 21 extending out of the core package 2 and the sealing cap are directly provided with the conductive adhesive, so as to ensure the direct electrical connection between the anode foil 21 and the sealing cap; a conductive adhesive may also be disposed between the cathode foil 23 extending out of the core pack 2 and the bottom of the case 1, so as to ensure the electrical connection between the cathode foil 23 and the case 1. In this embodiment, no conductive adhesive may be disposed between the cathode foil 23 extending out of the core package 2 and the bottom of the case 1, and the cathode foil 23 directly contacts the bottom of the case 1, so that the electrical connection between the cathode foil 23 and the bottom of the case 1 can be satisfied, because no dense oxide film is formed on the surface of the cathode foil 23, and the electrical conductivity of the cathode foil 23 is better than that of the anode foil 21.

In the present embodiment, the conductive adhesive is a heat-cured conductive adhesive, and after the aluminum electrolytic capacitor of the present embodiment is packaged, the sealing cap and the bottom of the case 1 are heated to cure the conductive adhesive. The other portions of this example are the same as example 1.

Claims

1. An aluminum electrolytic capacitor with a novel packaging structure is characterized in that: comprises a shell, a core bag and a sealing cover; the core bag is hermetically arranged in the shell through a sealing cover; the core bag is formed by winding an anode foil, electrolytic paper and a cathode foil, wherein the anode foil and the cathode foil respectively extend out of the upper end and the lower end of the core bag; the anode foil and the cathode foil which extend out of the core bag are respectively in electrical contact with the sealing cover and the bottom of the shell; an insulating film is arranged between the sealing cover and the shell, and the sealing cover is connected with the shell in a sealing mode.

2. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the sealing cover is connected with the insulating film in a sealing mode through insulating glue, and the shell is sealed with the insulating film through the insulating glue.

3. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the insulating film is extruded between the sealing cover and the shell, and the sealing cover and the shell seal the core package in the shell by extruding the insulating film.

4. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 3, wherein: the insulating film is extruded between the sealing cover and the shell through the beam waist; the number of the corset waists is one, two or three.

5. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the sealing cover, the shell and the insulating film are connected in a sealing mode through insulating glue.

6. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: and the sealing cover and the shell are respectively provided with an anode wiring terminal and a cathode wiring terminal.

7. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the anode foil extending out of the core bag and the sealing cover are welded together through heating the sealing cover.

8. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the cathode foil extending out of the core package and the bottom of the shell are welded together by heating the bottom of the shell.

9. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the anode foil extending out of the core bag is electrically connected with the sealing cover through the conductive adhesive.

10. The aluminum electrolytic capacitor with novel packaging structure as claimed in claim 1, wherein: the cathode foil extending out of the core package is electrically connected with the bottom of the shell through conductive adhesive.