CN211929315U

CN211929315U - Aluminum electrolytic capacitor

Info

Publication number: CN211929315U
Application number: CN202021054990.4U
Authority: CN
Inventors: 王宁; 陈亮; 范笑锋
Original assignee: Jiangyin Zhongwei Electronics Co ltd
Current assignee: Jiangyin Zhongwei Electronics Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2020-11-13
Anticipated expiration: 2030-06-10

Abstract

The utility model discloses an aluminum electrolytic capacitor, which comprises a capacitor body and a plastic diaphragm, wherein the capacitor body comprises a cover plate, an aluminum shell, a core cladding, pins and an explosion-proof valve; the core package is arranged in the aluminum shell, the pins are led out from the positive electrode and the negative electrode in the core package, the cover plate is fixed at the upper end of the core package, and the pins extend out of the cover plate and are riveted with the cover plate; the explosion-proof valve is arranged at the bottom of the aluminum shell, the surface of the explosion-proof valve is provided with explosion-proof lines, and a plastic membrane is arranged below the explosion-proof valve. The utility model discloses an add a plastic film piece in the bottom of explosion-proof valve, can prevent effectively that electric capacity explosion back electrolyte from revealing, the back of plastic film piece can be used to print simultaneously, conveniently traces back, simple structure, the sexual valence relative altitude.

Description

Aluminum electrolytic capacitor

Technical Field

The utility model relates to an aluminum electrolytic capacitor.

Background

The capacitor is used as an energy storage element and is widely applied to the fields of automobile industry, new energy, automatic control and the like, and the main production process of the aluminum electrolytic capacitor, particularly a large-sized welding sheet type capacitor is that positive and negative aluminum foils and electrolytic paper are attached together and are wound into a capacitor core, an aluminum shell is assembled, and a cover plate is riveted at the head of the aluminum shell. Simultaneously the condenser can be provided with an explosion-proof valve bottom the aluminum hull, and explosion-proof valve surface has explosion-proof line, behind the inside dielectric loss of electric capacity, the high temperature gas inflation that produces in the core package, and the condenser can be at first split from explosion-proof line part, avoids other positions of electric capacity to receive the harm. However, in practice, the function of the explosion-proof valve is unstable, and the electrolyte may leak from the crack after explosion, which may damage external equipment. The chinese patent publication No. CN107342167A discloses an aluminum electrolytic capacitor for preventing electrolyte from splashing, which adds a set of coated aluminum shell on the basis of the existing capacitor, and when the explosion-proof valve is released, the coated aluminum shell plays a role of blocking the electrolyte. However, the coated aluminum shell needs to be customized according to the size of the capacitor, the process is complicated, and the cost is high. In view of the above prior art, there is a need for further improvement of aluminum electrolytic capacitors.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an aluminum electrolytic capacitor, which comprises a capacitor body, a sleeve and a plastic diaphragm, wherein the capacitor body comprises a cover plate, an aluminum shell, a core cladding, pins and an explosion-proof valve; the core package is arranged in the aluminum shell, the pins are led out from the positive electrode and the negative electrode in the core package, the cover plate is fixed at the upper end of the core package, and the pins extend out of the cover plate and are riveted with the cover plate; the explosion-proof valve is arranged at the bottom of the aluminum shell, the surface of the explosion-proof valve is provided with explosion-proof grains, and a plastic membrane is arranged below the explosion-proof valve; the sleeve is made of PVC plastic, and the sleeve is sleeved outside the aluminum shell.

Further, the plastic membrane covers the surface of the explosion-proof line.

Furthermore, the plastic membrane is a cylindrical sheet, and the diameter of the bottom of the plastic membrane is smaller than that of the bottom surface of the explosion-proof valve.

Further, the difference between the diameters of the plastic membrane and the explosion-proof valve is 10-20 mm.

Further, the upper end of the sleeve extends to the upper surface of the aluminum shell and shrinks towards the center of the cover plate; the lower end of the sleeve extends out of the lower surface of the aluminum shell and contracts inwards, and the lower end of the sleeve covers the edge of the lower surface of the plastic membrane.

Further, the length of the lower end of the sleeve covering the edge of the lower surface of the plastic membrane is 10-15 mm.

Furthermore, the upper surface of the plastic membrane is provided with a channel corresponding to the anti-explosion lines, and the tail end of the channel extends out of the edge of the plastic membrane.

Further, the lower surface of the plastic film is provided with a production mark for marking production information.

The utility model discloses a plastic film piece has been add in the bottom of explosion-proof valve to tighten through the marginal pyrocondensation of cover pipe cover plastic film piece, can prevent effectively that electrolyte from revealing behind the electric capacity explosion, plastic film piece's lower surface can be used to print production information simultaneously, conveniently traces back, simple structure simultaneously, the sexual valence relative altitude.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure of an aluminum electrolytic capacitor according to the present invention;

FIG. 2 is a schematic view of an explosion-proof bottom pattern of an aluminum electrolytic capacitor according to the present invention;

FIG. 3 is a schematic diagram of a back structure of an aluminum electrolytic capacitor after a plastic diaphragm is mounted;

FIG. 4 is a schematic diagram of a back structure of the aluminum electrolytic capacitor bushing of FIG. 3;

FIG. 5 is a schematic cross-sectional view of an aluminum electrolytic capacitor after sleeving;

FIG. 6 is a cross-shaped channel on the upper surface of a plastic film sheet.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that the terms "upper end", "lower end", "upper surface" and "lower surface" in this specification are based on the front view shown in fig. 1 of the specification, and are used for convenience of describing the technical solution of the patent and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation.

With reference to fig. 1 to 3, an aluminum electrolytic capacitor comprises a capacitor body and a plastic membrane 1, wherein the capacitor body comprises a cover plate 2, an aluminum shell 3, a core package, pins 4 and an explosion-proof valve 5, the core package is arranged in the aluminum shell 3, the pins 4 are led out from the positive electrode and the negative electrode in the core package, the cover plate 2 is fixed at the upper end of the core package, and the pins 4 extend out of the cover plate 2 and are riveted with the cover plate 2; an explosion-proof valve 5 is arranged at the bottom of the aluminum shell 3, and explosion-proof grains 6 are arranged on the surface of the explosion-proof valve 5, as shown in fig. 2, the explosion-proof grains on the aluminum electrolytic capacitor related in the embodiment are cross-shaped; a plastic membrane 1 is arranged below the explosion-proof valve 5, and a sleeve 7 is sleeved outside the aluminum shell 3 through heat shrinkage.

The plastic membrane 1 isolates the exposed aluminum shell 3, so that the aluminum shell 3 is prevented from leaking electricity during working, and electrolyte in the core bag is prevented from leaking when the explosion-proof valve 5 explodes; when the internal dielectric loss of capacitor is too big, the high-temperature gas in the aluminum shell 3 outwards expands, the explosion-proof valve 5 is cracked all around from the center of explosion-proof line 6, and the gas in the core package is blocked by plastic film 1, prevents the electrolyte in the core package outwards spill, and the bottom of plastic film 1 can be used to print the relevant production information of capacitor simultaneously.

With reference to fig. 4, further, the sleeve 7 is made of PVC plastic, the plastic diaphragm 1 is in the shape of a cylindrical sheet, the diameter of the bottom of the plastic diaphragm 1 is smaller than the diameter of the bottom of the explosion-proof valve 5, the difference between the diameters of the explosion-proof valve 5 and the bottom of the plastic diaphragm 1 is preferably 10-20mm, the diameters are too different, and the plastic diaphragm 1 cannot perform an explosion-proof function. The lower end of the sleeve 7 extends out of the lower surface of the aluminum shell 3 and contracts inwards to cover the edge of the lower surface of the plastic membrane 1, the upper end of the sleeve 7 extends to the upper surface of the aluminum shell 3 and contracts inwards to provide bonding force between the plastic membrane 1 and the explosion-proof valve 5, preferably, the sleeve 7 covers the width of the lower surface of the plastic sheet 1 by 10-15mm, the covering size is too large, the processing requirement and the material for the sleeve are high, the covering size is too low, and the adhesion force between the plastic membrane and the explosion-proof valve cannot be provided.

As shown in fig. 5, due to the height difference between the plastic membrane 1 and the explosion-proof valve 5, the inner sleeve 7 is adjusted to form a section of cavity 8 when it is heat-shrunk in the area of the explosion-proof valve 5 not covered by the plastic membrane 1. The upper surface of the plastic membrane 1 has channels 9 corresponding to the explosion-proof lines 6, which channels are also cross-shaped channels, corresponding to the cross-shaped explosion-proof lines, shown in fig. 6. The ends of the channels 9 extend beyond the edges of the plastic film web 1. After the explosion-proof valve 5 is cracked, high-temperature gas is guided to a cavity 8 in the sleeve 7 through a channel 9, and pressure on the upper surface of the plastic membrane 1 is reduced.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. An aluminum electrolytic capacitor, characterized in that: the capacitor comprises a capacitor body, a sleeve and a plastic diaphragm, wherein the capacitor body comprises a cover plate, an aluminum shell, a core cladding, pins and an explosion-proof valve; the core package is arranged in the aluminum shell, the pins are led out from the positive electrode and the negative electrode in the core package, the cover plate is fixed at the upper end of the core package, and the pins extend out of the cover plate and are riveted with the cover plate; the explosion-proof valve is arranged at the bottom of the aluminum shell, the surface of the explosion-proof valve is provided with explosion-proof grains, and a plastic membrane is arranged below the explosion-proof valve; the sleeve is made of PVC plastic, and the sleeve is sleeved outside the aluminum shell.

2. The aluminum electrolytic capacitor of claim 1 wherein: the plastic membrane covers the surface of the explosion-proof line.

3. The aluminum electrolytic capacitor of claim 1 wherein: the plastic diaphragm is a cylindrical sheet, and the diameter of the bottom of the plastic diaphragm is smaller than that of the bottom surface of the explosion-proof valve.

4. The aluminum electrolytic capacitor of claim 3 wherein: the difference between the radiuses of the plastic membrane and the explosion-proof valve is 10-20 mm.

5. The aluminum electrolytic capacitor of claim 3 wherein: the upper end of the sleeve extends to the upper surface of the aluminum shell and contracts towards the center of the cover plate; the lower end of the sleeve extends out of the lower surface of the aluminum shell and contracts inwards, and the lower end of the sleeve covers the edge of the lower surface of the plastic membrane.

6. The aluminum electrolytic capacitor of claim 5 wherein: the length of the lower end of the sleeve covering the edge of the lower surface of the plastic membrane is 10-15 mm.

7. The aluminum electrolytic capacitor of claim 5 wherein: the upper surface of the plastic membrane is provided with a channel corresponding to the anti-explosion lines, and the tail end of the channel extends out of the edge of the plastic membrane.

8. The aluminum electrolytic capacitor as recited in any one of claims 1 to 7, wherein: the lower surface of the plastic film is provided with a production mark for marking production information.