CN218866910U

CN218866910U - Aluminum electrolytic capacitor based on sintered block

Info

Publication number: CN218866910U
Application number: CN202222860944.9U
Authority: CN
Inventors: 潘振炎; 贾明; 夏思凡
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: 2023-04-14
Anticipated expiration: 2032-10-28

Abstract

An aluminum electrolytic capacitor based on a sintered block comprises a shell, an anode body, a cathode foil, a cover plate and a lead-out assembly, wherein the anode body is hermetically arranged in the shell through the cover plate; the anode body is insulated from the shell, and an isolating film is arranged between the anode body and the cathode foil; the leading-out assembly comprises a cathode foil guiding strip, a cathode leading-out terminal, an anode foil guiding strip and an anode leading-out terminal, wherein one end of the cathode foil guiding strip is electrically connected to the cathode foil, the other end of the cathode foil guiding strip is electrically connected to the cathode leading-out terminal, one end of the anode foil guiding strip is electrically connected to the cathode foil, and the other end of the anode foil guiding strip is electrically connected to the anode leading-out terminal. In the utility model, the sintered body sintered by aluminum powder or aluminum alloy powder is used as the anode, and the anode body is sintered, so the anode body does not need to be corroded by acid and is relatively friendly to the environment; meanwhile, the porous structure of the anode body can ensure that the surface area of the anode body is large enough, and the capacity of the aluminum electrolytic capacitor can be effectively increased along with the increase of the volume of the anode body.

Description

Aluminum electrolytic capacitor based on sintered block

Technical Field

The utility model relates to an aluminum electrolytic capacitor especially relates to an aluminum electrolytic capacitor based on fritted block.

Background

At present, a large-sized aluminum electrolytic capacitor comprises a horn-shaped aluminum electrolytic capacitor and a bolt-shaped aluminum electrolytic capacitor, and both the horn-shaped aluminum electrolytic capacitor and the bolt-shaped aluminum electrolytic capacitor are wound aluminum electrolytic capacitors. The anode foils of the ox horn type aluminum electrolytic capacitor and the bolt type aluminum electrolytic capacitor are all adopted corrosion foils, the corrosion foils have limits on improving the capacity, and materials such as hydrochloric acid and sulfuric acid which have great pollution to the environment are required for producing the corrosion foils.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of overcoming the defects of the prior art and provides an aluminum electrolytic capacitor based on a sinter cake.

In order to solve the technical problem, the utility model provides a technical scheme does: an aluminum electrolytic capacitor based on a sintered block comprises a shell, an anode body, a cathode foil, a cover plate and a leading-out assembly, wherein the anode body is hermetically arranged in the shell through the cover plate, and is a sintered body formed by sintering aluminum powder or aluminum alloy powder; an insulating block is arranged between the anode body and the bottom of the shell, the anode body is insulated from the shell, and an isolating film is arranged between the anode body and the cathode foil; the leading-out assembly comprises a cathode foil guiding strip, a cathode leading-out terminal, an anode foil guiding strip and an anode leading-out terminal, one end of the cathode foil guiding strip is electrically connected to the cathode foil, the other end of the cathode foil guiding strip is electrically connected to the cathode leading-out terminal, one end of the anode foil guiding strip is electrically connected to the cathode foil, and the other end of the anode foil guiding strip is electrically connected to the anode leading-out terminal.

In the sintered block-based aluminum electrolytic capacitor, preferably, at least one layer of electrolytic paper is wound on the side surface of the anode body. The above aluminum electrolytic capacitor based on the sintered block preferably has the advantages that the anode leading-out terminal and the cathode leading-out terminal both comprise external terminals, aluminum rivets and washers, the anode foil guide strip or the cathode foil guide strip is electrically connected to the aluminum rivets, one end of each aluminum rivet is riveted to the external terminals, the other end of each aluminum rivet is connected with the washers after penetrating through the cover plate, and the aluminum rivets and the cover plate are tightly pressed through the washers in a matched mode to be connected in a sealed mode.

In the sintered block-based aluminum electrolytic capacitor, preferably, the external terminal includes one of a bolt and a horn terminal.

In the above sintered block-based aluminum electrolytic capacitor, preferably, a step is provided on one side of the open end of the case, the cover plate is prevented from resting on the step, and the case and the cover plate are hermetically connected.

Compared with the prior art, the utility model has the advantages of: in the utility model, the sintered body sintered by aluminum powder or aluminum alloy powder is used as the anode, and because the anode body is sintered, the anode body does not need to be corroded by acid, thus being relatively friendly to the environment; meanwhile, the porous structure of the anode body can ensure that the surface area of the anode body is large enough, and the capacity of the aluminum electrolytic capacitor can be effectively increased along with the increase of the volume of the anode body.

Drawings

Fig. 1 is a schematic view of the structure of a sintered compact-based aluminum electrolytic capacitor in example 1.

FIG. 2 is a schematic view showing the structure of the sintered compact-based aluminum electrolytic capacitor in example 2.

Description of the figures

1. A housing; 2. an anode body; 3. a cathode foil; 4. a cover plate; 41. a rubber layer; 42. a phenolic paperboard layer; 5. an insulating block; 6; an anode lead-out terminal; 61. an external connection terminal; 62. an aluminum rivet; 63. washer; 7. a cathode lead-out terminal; 8. girdling; 9. sealing the frame; 10. an anode foil guide strip; 11. and a cathode foil guide strip.

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 technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. 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

The aluminum electrolytic capacitor based on the sintered block as shown in fig. 1 comprises a shell 1, an anode body 2, a cathode foil 3, a cover plate 4 and a lead-out component, wherein the shell 1 is an aluminum shell. The anode body 2 is hermetically arranged in the shell 1 through a cover plate 4, and the anode body 2 is a porous sintered body sintered by aluminum powder or aluminum alloy powder; an insulating block 5 is arranged between the anode body 2 and the bottom of the shell 1, the anode body 2 is insulated from the shell 1, and an isolating film is arranged between the anode body 2 and the cathode foil 3; the leading-out assembly comprises a cathode foil guiding strip 11, a cathode leading-out terminal 7, an anode foil guiding strip 10 and an anode leading-out terminal 6, wherein one end of the cathode foil guiding strip 11 is electrically connected to the cathode foil 3, the other end of the cathode foil guiding strip is electrically connected to the cathode leading-out terminal 7, one end of the anode foil guiding strip 10 is electrically connected to the cathode foil 3, and the other end of the anode foil guiding strip is electrically connected to the anode leading-out terminal 6. The insulating block 5 may be a rubber block or a plastic block.

In this embodiment, the separator may be electrolytic paper or other insulating dielectric material. At least one layer of electrolytic paper is wound on the side surface of the anode body 2, and the number of the layers of the electrolytic paper is preferably 2-3, so that the anode body 2 and the cathode foil 3 can be effectively separated; meanwhile, the anode body 2 and the shell 1 can be effectively insulated and isolated by winding the electrolytic paper. In this embodiment, one end of the anode body 2 is insulated and isolated from the bottom of the housing 1 by the insulating block 5, the other end faces the cover plate 4, and the other four sides are wrapped with electrolytic paper, but in other embodiments, they may be isolated by an insulating medium.

In the present embodiment, since the anode body 2 as the anode is a one-piece porous sintered body, the effective surface area thereof is large, so that the capacitance of the capacitor can be effectively increased. Compared with the traditional aluminum electrolytic capacitor with the same volume, the aluminum electrolytic capacitor of the embodiment has the advantages that the capacitance can be improved by more than 20 percent; this is because the conventional winding type aluminum electrolytic capacitor core package is formed by winding the anode foil, the electrolytic paper and the cathode foil 3, that is, the cathode foil 3 and the electrolytic paper need to occupy a large volume in the core package, and the cathode foil 3 and the electrolytic paper do not contribute to the capacitance of the aluminum electrolytic capacitor.

The anode leading-out terminal 6 and the cathode leading-out terminal 7 both comprise an external terminal 61, an aluminum rivet 62 and a washer 63, the anode foil guiding strip 10 or the cathode foil guiding strip 11 is electrically connected to the aluminum rivet 62, one end of the aluminum rivet 62 is riveted to the external terminal 61, the other end of the aluminum rivet 62 is connected with the washer 63 after penetrating through the cover plate 4, and the aluminum rivet 62 and the cover plate 4 are tightly pressed through the washer 63 in a matched mode to be connected in a sealed mode. In the present embodiment, the external connection terminal 61 is a horn terminal, that is, the aluminum electrolytic capacitor of the present embodiment is a horn aluminum electrolytic capacitor.

In this embodiment, the cover plate 4 includes, in order from the outside to the inside, a rubber layer 41, a phenolic paper sheet layer 42, and a pp film. One side of the open end of the shell 1 is provided with a step through a girdling 8, the cover plate 4 is placed on the step, and the open end of the shell 1 is connected with the rubber layer 41 of the cover plate 4 in a sealing mode through a turned edge.

In the present embodiment, the sintered body sintered from the aluminum powder or the aluminum alloy powder serves as the anode, and since the anode body 2 is sintered, it is not necessary to be corroded by acid, and is relatively environmentally friendly; meanwhile, the porous structure of the anode body 2 can make the surface area of the anode body 2 large enough, and the capacity of the aluminum electrolytic capacitor can be effectively increased along with the increase of the volume of the anode body 2.

Example 2

As shown in fig. 2, in the present embodiment, an aluminum sealing frame 9 is extruded on the cover plate 4, the sealing frame 9 and the housing 1 are sealed and welded by laser welding, and the sealing frame 9 extrudes the rubber layer 41 on the cover plate 4 to ensure the sealing connection between the cover plate 4 and the housing 1. In this embodiment, the cover plate 4 is placed on the step formed by the girdling 8 on the side of the open end of the housing 1, the sealing between the housing 1 and the rubber layer 41 of the cover plate 4 is not performed by crimping, but by pressing the sealing frame 9, and then the sealing frame 9 is sealed with the open end of the housing 1 by laser welding, which is more effective. The other portions of this example are the same as example 1.

Claims

1. An aluminum electrolytic capacitor based on sintered blocks is characterized in that: the device comprises a shell, an anode body, a cathode foil, a cover plate and a lead-out assembly, wherein the anode body is hermetically arranged in the shell through the cover plate, and is a porous sintered body sintered by aluminum powder or aluminum alloy powder; the anode body is insulated from the shell, and an isolating film is arranged between the anode body and the cathode foil; the leading-out assembly comprises a cathode foil guiding strip, a cathode leading-out terminal, an anode foil guiding strip and an anode leading-out terminal, one end of the cathode foil guiding strip is electrically connected to the cathode foil, the other end of the cathode foil guiding strip is electrically connected to the cathode leading-out terminal, one end of the anode foil guiding strip is electrically connected to the cathode foil, and the other end of the anode foil guiding strip is electrically connected to the anode leading-out terminal.

2. The sintered cake based aluminum electrolytic capacitor of claim 1 wherein: an insulating block is arranged between the anode body and the bottom of the shell.

3. The sintered cake based aluminum electrolytic capacitor of claim 1 wherein: at least one layer of electrolytic paper is wound on the side surface of the anode body.

4. The sintered cake based aluminum electrolytic capacitor of claim 1 wherein: the anode leading-out terminal and the cathode leading-out terminal both comprise external terminals, aluminum rivets and washers, the anode foil guiding strips or the cathode foil guiding strips are electrically connected to the aluminum rivets, one ends of the aluminum rivets are riveted to the external terminals, the other ends of the aluminum rivets penetrate through the cover plate and then are connected with the washers, and the aluminum rivets and the cover plate are tightly pressed through the washers in a matched mode to be in sealing connection.

5. The sintered cake based aluminum electrolytic capacitor of claim 4 wherein: the external terminal includes one of a bolt and a horn terminal.

6. The sintered cake based aluminum electrolytic capacitor of claim 1 wherein: one side of the opening end of the shell is provided with a step, the cover plate is prevented from being arranged on the step, and the shell is connected with the cover plate in a sealing mode.