A kind of ox horn type capacitor end cover sealing structure

Abstract

The utility model discloses a kind of cowhorn type capacitor end cover sealing structure, it is related to capacitor structure technical field, solve the problem that existing cowhorn type resin end cover is easily sealed failure. Including end cover main body, end cover main body outer periphery is sealedly connected with capacitor shell, two through connecting holes are set in end cover main body, sealing assembly and connecting assembly are equipped in connecting hole, sealing assembly includes two sealing pad layers of upper and lower and the connecting sleeve of connecting two sealing pad layers, connecting sleeve passes through connecting hole, two sealing pad layers are respectively abutted on the upper side and lower side of cover plate main body, connecting assembly includes rivet and connecting terminal, rivet passes through connecting sleeve and the lower end of connecting terminal, connecting terminal lower end and two sealing pad layers are clamped and fixed on end cover main body. By terminal riveting, sealing pad layer is tightly compacted, sealing pad layer and end cover main body are tightly adhered to realize the sealing of terminal part, reach the effect of reducing cowhorn type capacitor roll groove seal and terminal riveting part liquid leakage.

Description

Technical Field

[0001] This utility model relates to the field of capacitor structure technology, and in particular to a horn-shaped capacitor end cap sealing structure. Background Technology

[0002] Existing horn capacitors, such as Figure 1 As shown, during winding, a guide foil strip is used as a positive and negative current collector to lead out the positive and negative electrodes. The guide foil strip is connected to the resin end cap rivets. Its sealing structure follows the traditional electrolytic capacitor method. Its end cap body is a combination end cap with a rubber pad pasted on the surface of phenolic resin. The internal sealing of the capacitor is achieved by the grooving device and the edge-rolling device at the capacitor head. The principle is to use the grooving to create a limiting device to fix the end cap body. When the aluminum shell is rolled, the aluminum shell is embedded in the rubber layer on the upper surface of the combination end cap. The elastic rubber layer fills the gaps to achieve a seal. In the existing horn-shaped resin end cap, the positive and negative electrode parts are sealed by using rivets and gaskets, which cause the rubber layer on the upper surface of the end cap to be squeezed and deformed to achieve a seal.

[0003] However, the disadvantage of the traditional horn-shaped capacitor end cap packaging method is that the end cap and the aluminum shell are in physical contact and rely on the compression of the two to achieve a seal. During product manufacturing and customer use, factors such as the end cap being subjected to force, the increased internal pressure of the container opening the aluminum shell seal, and the aging and loss of elasticity of the rubber layer can all lead to seal failure and leakage of capacitor electrolyte, which in turn can damage the user's equipment.

[0004] Therefore, the sealing of the terminal riveting part of the end cap of a traditional horn-shaped capacitor relies on the rubber layer on the upper surface of the end cap for sealing. When subjected to external force, the sealing performance of the end cap may be affected, leading to leakage. The high temperature of the soldering iron tip or wave soldering during capacitor soldering can cause localized heat damage to the rubber layer at the end cap terminal part, resulting in a high risk of leakage during later use. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing structure for the end cap of a horn-shaped capacitor. After the terminals are riveted, the sealing gasket is compacted, and the sealing gasket is tightly fitted to the end cap body to achieve a seal at the terminal part, thereby reducing leakage problems at the grooved seal and terminal riveting parts of the horn-shaped capacitor.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A horn-shaped capacitor end cap sealing structure includes an end cap body, the outer periphery of which is sealed to the capacitor shell. Two through-holes are formed in the end cap body, and sealing and connecting components are disposed within the holes.

[0008] The sealing assembly includes upper and lower sealing gaskets and a connecting sleeve connecting the two sealing gaskets. The connecting sleeve passes through a connecting hole, and the two sealing gaskets respectively abut against the upper and lower sides of the cover plate body.

[0009] The connecting assembly includes rivets and connecting terminals. The rivets pass through the lower ends of the connecting sleeve and the connecting terminals, clamping and fixing the lower end of the connecting terminals and the two sealing gaskets to the end cap body.

[0010] Furthermore, the sealing gasket is a rubber gasket.

[0011] Furthermore, the sealing gasket is made of nitrile rubber, phenolic resin, or fluoroplastic.

[0012] Furthermore, the end cap body has a ring of circular recessed holes at the upper and lower ends of the connecting hole, and the sealing gasket is located in the corresponding circular recessed holes.

[0013] Furthermore, a seepage-proof groove is provided at the bottom of the circular sinkhole, and the inner side of the sealing gasket layer covers the seepage-proof groove.

[0014] Furthermore, the end cap body is a metal end cap.

[0015] Furthermore, the end cap body is welded and sealed to the capacitor housing.

[0016] Furthermore, the end cap body is made of the same material as the capacitor casing.

[0017] Furthermore, the edge of the end cap body is provided with a stepped surface, and the end cap body partially enters the capacitor shell and partially abuts against the outer end of the capacitor shell through the stepped surface.

[0018] In summary, this utility model has the following beneficial effects:

[0019] 1. The present invention is a combined end cap, in which both the end cap body and the capacitor shell are made of metal. Laser welding can be used to fuse the edge of the end cap with the opening of the shell. Compared with the traditional physical contact and extrusion sealing method, the reliability of metal laser welding sealing is greatly improved.

[0020] Furthermore, a step is provided on the edge of the end cap body. When the capacitor is packaged, the edge step mates with the circumference of the aluminum shell opening. A laser welding machine is used to weld around the circumference of the aluminum shell opening, so that the edge of the end cap and the edge of the aluminum shell are completely fused into a whole, thereby achieving the sealing of the capacitor.

[0021] 2. The present invention provides a combined end cap with rubber layers on both the upper and lower end faces of the terminal riveting area. After the terminals are riveted, the gasket tightly presses the rubber layer, and the rubber layer is tightly attached to the aluminum sheet to achieve a seal at the terminal. This is a significant improvement over the single-layer rubber layer seal of traditional capacitor end caps.

[0022] 3. The combined end cap of this utility model has anti-seepage grooves at the two stepped surfaces of the terminal riveting joint. After the rivet presses the rubber layer, the rubber layer forms a seal, and at the same time, part of the rubber layer is squeezed into the anti-seepage groove, making the seal more reliable. Attached Figure Description

[0023] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the existing technology of a horn-shaped capacitor with a rolled edge encapsulation.

[0025] Figure 2 This is a schematic diagram of the overall connection structure of a horn-shaped capacitor end cap sealing structure according to this utility model;

[0026] Figure 3 This is a schematic diagram of the main body of the end cap in the horn-shaped capacitor end cap sealing structure of this utility model.

[0027] In the figure, 01 is the capacitor casing; 02 is the core; 1 is the end cap body; 11 is the circular recessed hole; 12 is the anti-seepage groove; 13 is the stepped surface; 2 is the sealing assembly; 21 is the sealing gasket; 22 is the connecting sleeve; 3 is the connecting assembly; 31 is the rivet; and 32 is the connecting terminal. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0029] A horn-shaped capacitor end cap sealing structure, such as Figure 2 and Figure 3 As shown, the device includes an end cap body 1, a capacitor housing 01, and a winding core 02 inside the capacitor housing 01. The outer periphery of the end cap body 1 is sealed to the capacitor housing 01. Two through-holes are provided in the end cap body 1, and a sealing component 2 and a connecting component 3 are provided in the connecting holes.

[0030] The sealing assembly 2 includes upper and lower sealing gaskets 21 and a connecting sleeve 22 connecting the two sealing gaskets 21. The connecting sleeve 22 passes through a connecting hole, and the two sealing gaskets 21 respectively abut against the upper and lower sides of the cover plate body. The sealing gaskets 21 and the connecting sleeve 22 are integrally connected and are both made of rubber. In some other embodiments, the sealing gaskets 21 and the connecting sleeve 22 may also be made of nitrile rubber, phenolic resin, or fluoroplastics.

[0031] like Figure 3 As shown, the connecting component 3 includes a rivet 31 and a connecting terminal 32 (positive or negative). The rivet 31 passes through the connecting sleeve 22 and the lower end of the connecting terminal 32, clamping and fixing the lower end of the connecting terminal 32 and the two sealing gaskets 21 onto the end cap body 1. In some embodiments, the sealing material of the terminal riveting part can be filled and sealed by glass or ceramic sintering.

[0032] The end cap body 1 also has a circular recessed hole 11 coaxially formed at the upper and lower ends of the connecting hole, and the sealing gasket 21 is located in the corresponding circular recessed hole 11; in order to further improve the sealing performance, a concentric anti-seepage groove 12 is also formed at the bottom of each circular recessed hole 11, and the inner side of the sealing gasket 21 is covered outside the anti-seepage groove 12.

[0033] like Figure 3 As shown, the end cap body 1 is a metal end cap. The end cap body 1 is welded and sealed to the capacitor shell 01. It can be made of aluminum, aluminum alloy, magnesium alloy, iron, stainless steel or other materials. In this embodiment, the end cap body 1 and the capacitor shell 01 are made of the same material, aluminum. The edge of the end cap body 1 is provided with a stepped surface 13. The end cap body 1 enters the capacitor shell 01 through the stepped surface 13 and abuts against the outer end of the capacitor shell 01. Alternatively, the stepped surface 13 may not be provided.

[0034] Traditional capacitor end cap rivet sealing structures rely primarily on the upper rubber layer of the end cap for sealing. However, in this embodiment, the end cap body 1 is made of aluminum sheet. Both the end cap body 1 and the capacitor shell 01 are made of metal, allowing for laser welding to fuse the edge of the end cap body 1 with the opening of the capacitor shell 01. Compared to traditional physical contact and compression sealing methods, metal laser welding significantly improves sealing reliability. Furthermore, the edge of the end cap body 1 has a stepped surface 13. During capacitor encapsulation, the stepped surface 13 of the end cap body 1 mates with the circumference of the opening of the aluminum shell (capacitor shell 01). A laser welding machine is used to weld around the circumference of the opening of the aluminum shell, completely fusing the edge of the end cap with the edge of the aluminum shell to achieve a seal for the capacitor.

[0035] Connecting holes are provided at the terminal riveting positions on the end cap body 1. A circular recessed hole 11 is provided on both the upper and lower end faces of the connecting holes. A rubber gasket (sealing gasket layer 21) is provided inside the circular recessed hole 11. After the terminal is riveted, the gasket tightly presses the rubber layer. The sealing gasket layer 21 fits tightly with the end cap body 1 to achieve a seal at the terminal. A rubber layer is provided on both the upper and lower end faces of the terminal riveting position. The sealing reliability after the terminal is riveted is greatly improved compared with the single-layer rubber layer seal of the traditional capacitor end cap.

[0036] Furthermore, anti-seepage grooves 12 are provided at the two stepped surfaces of the terminal riveting joint. After the rivet presses the rubber layer, the rubber layer forms a seal, and at the same time, part of the rubber in the rubber layer is squeezed into the anti-seepage grooves 12, making the seal more reliable. In addition, this new type of horn-shaped combined end cap is not only suitable for horn-shaped capacitors, but can also be applied to energy storage components such as lithium-ion batteries, sodium-ion batteries, thin film capacitors, and supercapacitors.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A cowhorn type capacitor end cap seal structure, characterized by: The system includes an end cap body, which is sealed to the capacitor housing. Two through-holes are formed within the end cap body, and sealing and connecting components are installed within these holes. The sealing assembly includes upper and lower sealing gaskets and a connecting sleeve connecting the two sealing gaskets. The connecting sleeve passes through a connecting hole, and the two sealing gaskets respectively abut against the upper and lower sides of the cover plate body. The connecting assembly includes rivets and connecting terminals. The rivets pass through the lower ends of the connecting sleeve and the connecting terminals, clamping and fixing the lower end of the connecting terminals and the two sealing gaskets to the end cap body.

2. The cowhorn type capacitor end cover sealing structure according to claim 1, characterized in that: The sealing gasket is a rubber gasket.

3. The cowhorn type capacitor end cover sealing structure according to claim 1, characterized in that: The sealing gasket is made of nitrile rubber, phenolic resin, or fluoroplastic.

4. The cowhorn type capacitor end cover sealing structure according to claim 1, characterized in that: The end cap body also has a ring of circular recessed holes at the upper and lower ends of the connecting hole, and the sealing gasket is located in the corresponding circular recessed holes.

5. A cowhorn type capacitor end cover seal structure according to claim 4, wherein: A seepage-proof groove is also provided at the bottom of the circular sinkhole, and the inner side of the sealing gasket is covered outside the seepage-proof groove.

6. The cowhorn type capacitor end cover sealing structure according to claim 1, characterized in that: The end cap body is a metal end cap.

7. A cowhorn type capacitor end cover seal structure according to claim 6, wherein: The end cap body is welded and sealed to the capacitor housing.

8. The cowhorn type capacitor end cover sealing structure according to claim 1 or 7, characterized in that: The end cap body is made of the same material as the capacitor shell.

9. The cowhorn type capacitor end cover sealing structure according to claim 1 or 7, characterized in that: The edge of the end cap body is provided with a stepped surface, and the end cap body partially enters the capacitor shell through the stepped surface and partially abuts against the outer end of the capacitor shell.

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