CN218782926U

CN218782926U - Aluminum electrolytic capacitor

Info

Publication number: CN218782926U
Application number: CN202222860508.1U
Authority: CN
Inventors: 潘振炎; 贾明; 沈灿红
Original assignee: Hunan Aihua Group Co Ltd
Current assignee: Hunan Aihua Group Co Ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-03-31
Anticipated expiration: 2032-10-28

Abstract

An aluminum electrolytic capacitor comprises a square anode body, a shell and an isolation component, wherein the anode body is hermetically arranged in the shell; the anode body is a porous sintered body formed by sintering aluminum powder or aluminum alloy powder; an anode isolating block and a cathode isolating block are respectively arranged at two ends of the anode body, and the anode body is isolated from the shell by the anode isolating block and the cathode isolating block; an anode lead is led out of the anode body, and the anode body and the shell are filled with electrolyte. In the invention, the anode body is used for replacing the traditional corrosion anode foil, so that the anode is relatively environment-friendly; meanwhile, the anode body is square, so that the aluminum electrolytic capacitor can be made into a square block, and space is saved when the aluminum electrolytic capacitor is installed on a circuit board. The anode body of the invention does not need to be wound into a core cladding as the traditional capacitor, thereby simplifying the production process of the aluminum electrolytic capacitor.

Description

Aluminum electrolytic capacitor

Technical Field

The invention relates to an aluminum electrolytic capacitor, in particular to a brand new square liquid aluminum electrolytic capacitor.

Background

At present, the application of the aluminum electrolytic capacitor is very wide, however, with the development of miniaturization of electronic products, the volume of the aluminum electrolytic capacitor is required to be reduced on the premise of not damaging the capacity, and thus the capacity of the aluminum electrolytic capacitor is required to be improved.

The anode foil of the existing aluminum electrolytic capacitor is made of corrosion foil, in order to increase the capacity of the aluminum electrolytic capacitor, a large number of ravines are formed on the surface of the anode foil when the anode foil is corroded by acid, and the anode foil is relatively thin, so that the anode foil is very low in strength and very brittle; this increases the difficulty of production.

Meanwhile, there is a limit to increase the surface area of the anode foil by acid etching, because formation is required in the subsequent production process of the anode foil, that is, an oxide film is formed on the surface of the anode foil, and too small ravines on the anode foil are filled with the oxide film, so that there is a limit to obtain a large surface area on the surface of the anode foil by etching.

In the production of the traditional corrosion foil, one or more of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid and the like are used during corrosion, and the treatment of the acid is relatively troublesome and has relatively great environmental protection problem.

In view of the above circumstances, a proposal of replacing the anode foil with a sintered body has been made, for example, patent 1CN109994318a, an aluminum electrolytic capacitor and a method for manufacturing the same; in the disclosed technical scheme, the positive electrode block is sealed in the shell after being coated by the electrolytic paper and the cathode foil, however, the positive electrode block is cylindrical, and is relatively difficult to form when being sintered; meanwhile, in patent 1, the positive electrode block is easily brought into contact with the case to cause a short circuit.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the aluminum electrolytic capacitor with high capacity, the anode body for the aluminum electrolytic capacitor replaces the prior corrosion anode foil, the winding is not needed, and the production process of the aluminum electrolytic capacitor is simplified.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: an aluminum electrolytic capacitor comprises a square anode body, a shell and an isolating component, wherein the anode body is hermetically arranged in the shell by a cover plate; the anode body is a porous sintered body sintered by aluminum powder or aluminum alloy powder; an anode isolation block and a cathode isolation block are respectively arranged at two ends of the anode body, and the anode body is isolated from the shell by the anode isolation block and the cathode isolation block; an anode lead is led out of the anode body, and the anode body and the shell are filled with electrolyte.

Preferably, the housing of the aluminum electrolytic capacitor includes an aluminum case and a cover plate, and the cover plate is hermetically welded to the aluminum case by laser welding.

In the above aluminum electrolytic capacitor, preferably, the anode spacer block and the cathode spacer block are provided with a neck of the anode body.

In the above aluminum electrolytic capacitor, preferably, the outer side of the anode body is wrapped with electrolytic paper.

In the above aluminum electrolytic capacitor, preferably, a cathode foil is disposed on one side of the anode body, and the anode foil and the cathode foil are separated by an electrolytic paper wrapped outside the anode body; and the cathode foil is electrically connected with a cathode lead.

In the above aluminum electrolytic capacitor, preferably, the anode lead extends from the cover plate and is sealed with the cover plate by a rubber plug; the cathode lead extends out of the shell on the opposite side of the cover plate, and the cathode lead and the shell are sealed through a rubber plug.

In the above aluminum electrolytic capacitor, preferably, the cathode lead includes an aluminum wire, an aluminum stem and an aluminum tongue, the aluminum wire and the aluminum tongue are respectively connected to two ends of the aluminum stem, and one end of the aluminum tongue connected to the aluminum stem is bent to form a staggered step; one end of the aluminum tongue connected with the cathode foil is arranged in a groove arranged on the cathode isolation block.

In the above aluminum electrolytic capacitor, preferably, the anode spacer block and the cathode spacer block both include a rubber pad or a teflon pad.

In the above aluminum electrolytic capacitor, preferably, a polytetrafluoroethylene pad is disposed between the rubber pad and the anode body.

In the above aluminum electrolytic capacitor, preferably, the case includes an aluminum plastic bag, and the outer side of the anode body is wrapped with electrolytic paper; a cathode foil is arranged on one side of the anode body, and the anode foil and the cathode foil are separated by electrolytic paper wrapped on the outer side of the anode body; the cathode foil is electrically connected with a cathode lead; the anode lead and the cathode lead extend out of the aluminum plastic bag, and the joint of the anode lead and the cathode lead with the aluminum plastic bag is sealed by hot pressing.

Compared with the prior art, the invention has the advantages that: in the invention, the anode body is used for replacing the traditional corrosion anode foil, so that the anode is relatively environment-friendly; meanwhile, the anode body is square, the anode body is convenient to form during sintering, and meanwhile, the aluminum electrolytic capacitor can be made into a square block shape, so that space is saved during installation on a circuit board. The anode body of the invention does not need to be wound into a core cladding as the traditional capacitor, thereby simplifying the production process of the aluminum electrolytic capacitor.

Drawings

FIG. 1 is a schematic view showing an assembly structure of an aluminum electrolytic capacitor in example 1.

FIG. 2 is a schematic view showing an assembly structure of an aluminum electrolytic capacitor in example 2.

FIG. 3 is a schematic view showing an assembly structure of an aluminum electrolytic capacitor in example 3.

FIG. 4 is a schematic view showing an assembly structure of an aluminum electrolytic capacitor in example 4.

FIG. 5 is a schematic view showing an assembly structure of an aluminum electrolytic capacitor in example 5.

Description of the drawings

1. An anode body; 2. an aluminum housing; 3. an anode separator; 31. sealing the rubber plug; 4. a cathode separator; 41. a card slot; 5. a cover plate; 6. electrolyzing paper; 7. an anode lead; 8. a cathode lead; 81. an aluminum wire; 82. aluminum stems; 83. an aluminum tongue; 9. a polytetrafluoroethylene mat.

Detailed Description

In order to facilitate an understanding of the invention, the invention will now be described more fully and in detail with reference to the preferred embodiments, but the scope of the 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

As shown in fig. 1, in the present embodiment, an aluminum electrolytic capacitor is provided, which includes a square anode body 1, an aluminum case 2, an isolation assembly and a cover plate 5, where the cover plate 5 is made of aluminum, the anode body 1 is sealed by the cover plate 5 and disposed in the case, and the cover plate 5 and the aluminum case 2 are hermetically connected by laser welding; the anode body 1 is a porous sintered body formed by sintering aluminum powder or aluminum alloy powder; an anode isolating block and a cathode isolating block are respectively arranged at two ends of the anode body 1, and the anode isolating block and the cathode isolating block separate the anode body 1 from the shell and the cover plate 5; an anode lead 7 is led out of the anode body 1, and the anode body 1 and the aluminum shell 2 are filled with electrolyte.

In this embodiment, positive pole spacing block and negative pole spacing block are rubber buffer or polytetrafluoroethylene pad 9, are provided with the draw-in groove 41 of the positive pole body 1 on rubber buffer or polytetrafluoroethylene pad 9, and the both ends card of positive pole body 1 is in the draw-in groove 41 on rubber buffer or polytetrafluoroethylene pad 9, and after packing into aluminum hull 2 with positive pole body 1 like this, because rubber buffer or polytetrafluoroethylene pad 9 are built on stilts with positive pole body 1, thereby positive pole body 1 just can not contact the short circuit with aluminum hull 2 like this.

In this embodiment, the cathode lead 8 is directly welded to the aluminum case 2, and the cathode of the capacitor is led out from the aluminum case 2. In this embodiment, since the electrolyte is filled in the anode body 1 and the aluminum case 2, the electrolyte is the actual cathode of the capacitor, and the electrolyte is in contact with the case, the cathode of the capacitor can be directly led out from the aluminum case 2.

In this embodiment, the anode lead 7 is led out from the anode body 1, the anode lead 7 is an aluminum wire 81, and the aluminum wire 81 as the anode is directly welded on the anode body 1; the anode lead 7 may be directly sintered to the anode body 1 at the time of sintering the anode body 1. An anode lead 7 sequentially penetrates through the anode isolation block and the cover plate 5; the anode lead 7 and the cover plate 5 are sealed by extrusion through a sealing rubber plug 31, and can also be sealed through a sealing glue.

In the embodiment, the anode body 1 is used for replacing a traditional corrosion anode foil, and is relatively environment-friendly; meanwhile, the anode body 1 of the aluminum electrolytic capacitor is square, so that the aluminum electrolytic capacitor can be made into a square block, and space is saved when the aluminum electrolytic capacitor is installed on a circuit board. The anode body 1 of the invention does not need to be wound into a core cladding as the traditional capacitor, thereby simplifying the production process of the aluminum electrolytic capacitor.

Example 2

As shown in fig. 2, in the present embodiment, at least one layer of electrolytic paper 6 is wrapped around the outer side of the square anode body 1, and the outer side of the square anode body 1 wrapping the electrolytic paper 6 has 4 sides other than the sides in contact with the anode separator and the cathode separator. In this embodiment, the two ends of the square anode body 1 are respectively clamped on the anode separator 3 and the cathode separator 4, and the other 4 sides are wrapped with the electrolytic paper 6, so as to ensure that the square anode body 1 does not contact the aluminum shell 2, thereby avoiding the short circuit. The other portions of this example are the same as example 1.

Example 3

As shown in fig. 3, the rubber stopper or teflon mat 9 as the anode separator 3 in the present embodiment is not provided with the catching groove 41 of the anode body 1; the rubber stopper or the teflon gasket 9 as the cathode separator 4 is not provided with the catching groove 41 of the anode body 1. At the time of assembly, the anode body 1 is in contact with or slightly pressed between the anode separator 3 and the cathode separator 4, and the other parts of the present embodiment are the same as those of embodiment 2. In this embodiment, two ends of the anode body 1 are respectively contacted with the anode spacer and the cathode spacer, and the other 4 sides are wrapped with at least one layer of electrolytic paper 6, so that the anode body 1 of the aluminum electrolytic capacitor in this embodiment is not contacted with the aluminum case 2 after being assembled.

Example 4

As shown in fig. 4, in the present embodiment, both the anode separator 3 and the cathode separator 4 are rubber stoppers, and a polytetrafluoroethylene mat 9 is provided between the anode separator 3 or the cathode separator 4 and the anode body 1. The other portions of this example are the same as example 1.

Example 5

As shown in fig. 5, in the present embodiment, a cathode foil is disposed on one side of the anode body 1, and the anode foil and the cathode foil are separated by an electrolytic paper 6 wrapped on the outer side of the anode body 1; the cathode foil is riveted or welded with a cathode lead 8. The cathode lead 8 comprises an aluminum wire 81, an aluminum stem 82 and an aluminum tongue 83, the aluminum wire 81 and the aluminum tongue 83 are respectively connected to two ends of the aluminum stem 82, and the aluminum tongue 83 is bent at one end connected with the aluminum stem 82 to form a staggered step; the end of the aluminum tongue 83 connected to the cathode foil is placed in a groove provided on the cathode spacer. The end of the aluminum tongue 83 connected to the cathode foil is placed in a groove provided on the cathode spacer. In this embodiment, since the cathode foil is provided on one side of the anode body 1, the aluminum tab 83 of the cathode lead 8 needs to be provided with a step of misalignment so that the aluminum tab 83 can be riveted or welded to the cathode foil. The aluminum tabs 83 are disposed in slots provided on the cathode spacer block so that the aluminum tabs 83 do not protrude above the cathode spacer block. The other portions of this example are the same as example 1.

Example 6

In this embodiment, the housing comprises an aluminum-plastic bag, and the outside of the anode body 1 is completely covered with the electrolytic paper 6; one side of the anode body 1 is provided with a cathode foil, and the anode foil and the cathode foil are separated by electrolytic paper 6 wrapped outside the anode body 1; a cathode lead 8 is electrically connected to the cathode foil; the anode lead 7 and the cathode lead 8 extend out of the aluminum plastic bag, and the joint of the anode lead 7 and the cathode lead 8 with the aluminum plastic bag is sealed by hot pressing. The other portions of this example are the same as example 1.

Claims

1. An aluminum electrolytic capacitor, characterized in that: the device comprises a square anode body, a shell and an isolation assembly, wherein the anode body is hermetically arranged in the shell; the anode body is a porous sintered body formed by sintering aluminum powder or aluminum alloy powder; an anode isolating block and a cathode isolating block are respectively arranged at two ends of the anode body, and the anode body is isolated from the shell by the anode isolating block and the cathode isolating block; an anode lead is led out of the anode body, and the anode body and the shell are filled with electrolyte.

2. The aluminum electrolytic capacitor of claim 1, wherein: the shell comprises an aluminum shell and a cover plate, and the cover plate is welded on the aluminum shell in a sealing mode through laser welding.

3. The aluminum electrolytic capacitor of claim 2, wherein: and the anode isolating block and the cathode isolating block are provided with clamping grooves of anode bodies.

4. The aluminum electrolytic capacitor of any one of claims 1 to 3, wherein: the outer side of the anode body is wrapped with electrolytic paper.

5. The aluminum electrolytic capacitor of claim 4, wherein: a cathode foil is arranged on one side of the anode body, and the anode foil and the cathode foil are separated by electrolytic paper wrapped on the outer side of the anode body; and the cathode foil is electrically connected with a cathode lead.

6. The aluminum electrolytic capacitor according to claim 5, wherein: the anode lead extends out of the cover plate and is sealed with the cover plate through a rubber plug; the cathode lead extends out of the shell on the opposite side of the cover plate, and the cathode lead and the shell are sealed through a rubber plug.

7. The aluminum electrolytic capacitor of claim 5, wherein: the cathode lead comprises an aluminum wire, an aluminum stem and an aluminum tongue, the aluminum wire and the aluminum tongue are respectively connected to two ends of the aluminum stem, and one end of the aluminum tongue connected with the aluminum stem is bent to form a staggered step; one end of the aluminum tongue connected with the cathode foil is arranged in a groove arranged on the cathode isolation block.

8. The aluminum electrolytic capacitor of claim 1, wherein: the anode isolation block and the cathode isolation block both comprise rubber pads.

9. The aluminum electrolytic capacitor of claim 8, wherein: and a polytetrafluoroethylene pad is arranged between the rubber pad and the anode body.

10. The aluminum electrolytic capacitor according to claim 1, wherein: the shell comprises an aluminum-plastic bag, and the outer side of the anode body is wrapped with electrolytic paper; a cathode foil is arranged on one side of the anode body, and the anode foil and the cathode foil are separated by electrolytic paper wrapped on the outer side of the anode body; the cathode foil is electrically connected with a cathode lead; the anode lead and the cathode lead extend out of the aluminum plastic bag, and the joint of the anode lead and the cathode lead with the aluminum plastic bag is sealed by hot pressing.