Aluminum electrolytic capacitor with good safety performance

Abstract

An aluminum electrolytic capacitor with good safety performance comprises a shell, a core bag, a cover plate and a fixing plate. An anode leading-out terminal and a cathode leading-out terminal are arranged on the sealing cover plate; the cover plate comprises a rubber layer and a hard resin plate, and the rubber layer is arranged on the hard resin plate in a sealed mode. The fixing plate is arranged below the hard resin plate; two first rivets are arranged on the fixed plate; an anode guide chaff and a cathode guide chaff of the core package are respectively riveted on one first rivet; and the two first rivets are respectively contacted and electrically connected with the anode leading-out terminal and the cathode leading-out terminal. Under the condition that the internal pressure of the aluminum electrolytic capacitor is increased, the cover plate firstly bulges under the action of the pressure, and the second rivet on the cover plate and the first rivet on the fixed plate are separated and powered off due to the formation of the bulge, so that a core bag in the capacitor fails and does not generate heat any more, and the internal air pressure of the aluminum electrolytic capacitor does not rise any more; therefore, the problem of electrolyte spraying caused by opening of the anti-explosion valve can be prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of aluminum electrolytic capacitors, especially a kind of aluminum electrolytic capacitor with good safety performance. BACKGROUND

[0002] Because of the core package of liquid aluminum electrolytic capacitor contains impregnation electrolyte, when there is abnormal voltage or product short-circuit fault, etc., the core package generates heat, so that the electrolyte will appear vaporization phenomenon, leading to the internal pressure of capacitor will rise, when the pressure rises to a certain degree, there is "steam-like electrolyte" spouts, thereby polluting the inside of equipment, serious possible will appear the safety accident caused by circuit board fire. SUMMARY

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, and provide an aluminum electrolytic capacitor with good safety performance.

[0004] To solve the above technical problems, the technical scheme provided by the utility model is as follows: an aluminum electrolytic capacitor with good safety performance, comprising a shell, a core package, a cover plate and a fixing plate; the core package is sealed in the shell by the cover plate; an anode lead-out terminal and a cathode lead-out terminal are arranged on the sealing cover plate; the cover plate comprises a rubber layer and a hard resin plate, and the rubber layer is sealed on the hard resin plate; the fixing plate is arranged below the hard resin plate; two first rivets are arranged on the fixing plate, and anode foil strips and cathode foil strips of the core package are riveted on one first rivet respectively; the two first rivets are in contact with and electrically connected to the anode lead-out terminal and the cathode lead-out terminal respectively.

[0005] Preferably, the anode lead-out terminal and the cathode lead-out terminal each comprise an external terminal and a second rivet, and the external terminal is in extrusion sealing connection with the rubber layer; the top of the first rivet is in contact with and electrically connected to the lower part of the second rivet.

[0006] Preferably, the lower part of the first rivet is provided with a groove in contact connection with the top of the second rivet.

[0007] Preferably, the fixing plate is provided with an edge fixing part and a rivet connecting part, and the edge fixing part is fixedly connected with the rivet connecting part; the edge fixing part is fixedly connected between the rubber layer and the waist of the shell.

[0008] Preferably, a step is formed between the rivet connecting part and the edge fixing part.

[0009] Preferably, a vent hole is arranged on the fixing plate.

[0010] The safety performance good aluminum electrolytic capacitor, preferably, the diameter of the hard resin plate is less than the diameter of the rubber layer, the centers of the hard resin plate and the rubber layer coincide, and the edge part of the hard resin plate extending out of the fixed plate is connected with the edge part of the fixed plate through the fixing glue.

[0011] The safety performance good aluminum electrolytic capacitor, preferably, the diameter of the hard resin plate is less than the diameter of the rubber layer, the centers of the hard resin plate and the rubber layer coincide, and the edge part of the hard resin plate extending out of the fixed plate is connected with the edge part of the fixed plate through the fixing glue.

[0012] Compared with the prior art, the advantages of the aluminum electrolytic capacitor lie in that when the internal pressure of the aluminum electrolytic capacitor increases, the cover plate is first formed to be bulged under the pressure, the bulging causes the second rivet on the cover plate and the first rivet on the fixed plate to be separated and disconnected, the internal core of the capacitor is disabled and no longer heated, the internal air pressure of the aluminum electrolytic capacitor no longer increases, and thus the problem of electrolyte spraying caused by the opening of the explosion-proof valve can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a sectional structure schematic view of the safety performance good aluminum electrolytic capacitor in Example 1.

[0014] Figure 2 It is a sectional structure schematic view of the safety performance good aluminum electrolytic capacitor in Example 1 after being disabled.

[0015] LEGEND

[0016] 1, shell; 11, curled edge part; 12, waist part; 2, core; 21, anode foil; 22, cathode foil; 3, cover plate; 31, rubber layer; 32, hard resin plate; 4, fixed plate; 5, anode lead terminal; 6, cathode lead terminal; 7, first rivet; 8, external terminal; 9, second rivet; 10, groove. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present application, the following will be combined with the drawings and the preferred embodiments to make a more comprehensive and detailed description of the present application, but the protection scope of the present application is not limited to the following specific embodiments.

[0018] It should be particularly noted that when a certain element is described as being "fixed to, connected to, or communicated to" another element, it can be directly fixed, connected or communicated to the other element, or indirectly fixed, connected or communicated to the other element through other intermediate connecting elements.

[0019] Unless otherwise defined, all terms used in the description employed herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents. Embodiment

[0020] As Figure 1 shown in the drawings, the aluminum electrolytic capacitor with good safety performance comprises a shell 1, a core package 2, a cover plate 3 and a fixed plate 4; the core package 2 is sealed in the shell 1 through the cover plate 3; an anode lead-out terminal 5 and a cathode lead-out terminal 6 are arranged on the sealing cover plate 3; the cover plate 3 comprises a rubber layer 31 and a hard resin plate 32, the rubber layer 31 is sealed on the hard resin plate 32; the fixed plate 4 is arranged below the hard resin plate 32; two first rivets 7 are arranged on the fixed plate 4, an anode foil guide strip 21 and a cathode foil guide strip 22 of the core package 2 are riveted on one first rivet 7 respectively; the two first rivets 7 are in contact with and electrically connected with the anode lead-out terminal 5 and the cathode lead-out terminal 6 respectively. The fixed plate 4 is provided with a vent hole.

[0021] In the embodiment, the anode lead-out terminal 5 and the cathode lead-out terminal 6 each comprise an external terminal 8 and a second rivet 9, the external terminal 8 is in extrusion sealing connection with the rubber layer 31; the top of the first rivet 7 is in contact with and electrically connected with the lower part of the second rivet 9. The lower part of the first rivet 7 is provided with a groove 10 in contact connection with the top of the second rivet 9.

[0022] In the embodiment, as Figure 2 shown in the drawings, when the aluminum electrolytic capacitor encounters an abnormal voltage or a short circuit failure of the product and the like, the core package 2 generates heat, causing the electrolyte in the shell 1 to vaporize and expand, at this time, the explosion-proof valve at the bottom of the shell 1 has not been opened, but under the pressure generated by the vaporization of the electrolyte, the rubber layer 31 of the cover plate 3 will bulge, and the rubber layer 31 and the hard resin plate 32 are connected together through the fixing glue, so the hard resin plate 32 and the fixed plate 4 will be separated; and the second rivet 9 and the first rivet 7 fixed on the cover plate 3 and the fixed plate 4 respectively will be separated and disconnected, so as to achieve the purpose of failure of the aluminum electrolytic capacitor; at this time, the core package 2 will not generate heat any more, and the explosion-proof valve will not be opened to cause the electrolyte to be sprayed out.

[0023] In the embodiment, the fixed plate 4 is provided with an edge fixed part and a rivet connecting part, the edge fixed part is fixedly connected with the rivet connecting part; the edge fixed part is fixedly connected between the rubber layer 31 and the waist of the shell 1. A step is formed between the rivet connecting part and the edge fixed part. In the embodiment, after the edge curling process of the aluminum electrolytic capacitor is completed, the edge part of the fixed plate 4 and the edge part of the cover plate 3 are extruded between the waist part 12 of the shell 1 and the edge curling part 11 of the shell 1, so that the fixing is completed. In the embodiment, the fixed plate 4 is provided with a vent hole, when the core package 2 is heated, the rubber layer 31 is bulged under the action of the steam pressure of the electrolyte, and the fixed plate 4 does not deform.

[0024] In the embodiment, the diameter of the hard resin plate 32 is smaller than the diameter of the rubber layer 31, the centers of the hard resin plate 32 and the rubber layer 31 are coincident; the edge part of the fixed plate 4 extending out of the hard resin plate 32 is connected with the edge part of the fixed plate 4. The diameter of the hard resin plate 32 is smaller than the diameter of the rubber layer 31, the centers of the hard resin plate 32 and the rubber layer 31 are coincident; the edge part of the fixed plate 4 extending out of the hard resin plate 32 is fixedly connected with the edge part of the fixed plate 4 through the fixing glue.

[0025] In the aluminum electrolytic capacitor, when the internal pressure increases, the cover plate 3 is first bulged under the action of the pressure, and the bulging causes the second rivet 9 on the cover plate 3 and the first rivet 7 on the fixed plate 4 to be separated and disconnected, so that the core package in the capacitor is invalid and no longer heated, the internal pressure of the aluminum electrolytic capacitor no longer rises, and therefore the problem of electrolyte spraying caused by the opening of the explosion-proof valve can be prevented.

Claims

1. An aluminum electrolytic capacitor having a high safety performance, characterized by: The application relates to a battery, which comprises a shell, a core package, a cover plate and a fixing plate; the core package is sealed in the shell through the cover plate; anode and cathode lead-out terminals are arranged on the cover plate; the cover plate comprises a rubber layer and a hard resin plate, the rubber layer is sealed on the hard resin plate; the fixing plate is arranged below the hard resin plate; two first rivets are arranged on the fixing plate, anode and cathode lead foils of the core package are riveted on the first rivets respectively; the two first rivets are in contact with and electrically connected with the anode and cathode lead-out terminals respectively.

2. The aluminum electrolytic capacitor with good safety performance according to claim 1, characterized in that: The anode and cathode lead-out terminals each comprise an external terminal and a second rivet, the external terminal is in extrusion sealing connection with the rubber layer; the top of the first rivet is on the lower part of the second rivet to be in contact and electrically connected.

3. The aluminum electrolytic capacitor with high safety performance according to claim 2, characterized in that: The lower part of the first rivet is provided with a groove in contact connection with the top of the second rivet.

4. The aluminum electrolytic capacitor with good safety performance according to claim 1, characterized in that: The fixing plate is provided with an edge fixing part and a rivet connecting part, the edge fixing part is fixedly connected with the rivet connecting part; the edge fixing part is fixedly connected between the rubber layer and the waist of the shell.

5. The aluminum electrolytic capacitor with high safety performance according to claim 4, characterized in that: A step is formed between the rivet connecting part and the edge fixing part.

6. The aluminum electrolytic capacitor with good safety performance according to claim 1, characterized in that: The fixing plate is provided with a vent hole.

7. The aluminum electrolytic capacitor with good safety performance according to any one of claims 1 to 6, characterized in that: The diameter of the hard resin plate is smaller than that of the rubber layer, the centers of the hard resin plate and the rubber layer are coincident; the edge part of the fixing plate extending out of the hard resin plate is in contact connection with the edge part of the fixing plate.

8. The aluminum electrolytic capacitor with high safety performance according to claim 7, wherein: The edge part of the fixing plate extending out of the hard resin plate is fixedly connected with the edge part of the fixing plate through fixing glue.

Images