Aluminum electrolytic capacitor with improved sealing

Abstract

The utility model provides an aluminum electrolytic capacitor with good sealing, which comprises a cover plate, a core package and a shell, the core package is sealingly arranged in the shell by the cover plate, the cover plate comprises an insulating center plate and an aluminum outer rim, the insulating center plate and the aluminum outer rim are inlaid with each other and sealingly connected together, and the aluminum outer rim and the shell are sealingly connected by laser welding. In the utility model, the aluminum outer rim of the cover plate and the shell are sealingly connected by laser welding instead of the conventional crimping and extruding sealing, so that the sealing effect is better.

Description

Technical Field

[0001] This utility model relates to an aluminum electrolytic capacitor, and more particularly to an aluminum electrolytic capacitor with good sealing performance. Background Technology

[0002] Traditional horn-shaped aluminum electrolytic capacitors and bolt-shaped aluminum electrolytic capacitors both use a cover plate to seal between the cover plate and the outer shell. The cover plate consists of a resin plate and a rubber layer, and the top edge of the outer shell is rolled and squeezed into the rubber layer to seal. However, this rolled and squeezed seal cannot completely seal the capacitor. The vapor pressure formed by the electrolyte when heated allows the electrolyte to overflow from the rolled and squeezed area, which affects the lifespan of the aluminum electrolytic capacitor. Utility Model Content

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

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: an aluminum electrolytic capacitor with good sealing performance, comprising a cover plate, a core package, and a shell, wherein the cover plate seals the core package inside the shell; the cover plate comprises an insulating center plate and an aluminum outer ring, wherein the insulating center plate and the aluminum outer ring are interlocked and sealed together; the aluminum outer ring is sealed to the shell by laser welding.

[0005] Preferably, in the above-mentioned aluminum electrolytic capacitor with good sealing performance, the outer edge of the insulating center plate is provided with a protrusion and / or a groove, and the inner side of the aluminum outer edge is provided with a groove and / or a protrusion that matches the protrusion and / or groove.

[0006] Preferably, in the above-mentioned aluminum electrolytic capacitor with good sealing performance, the anode terminal and the cathode terminal are sealed and connected to the insulating center plate; the anode terminal and the cathode terminal are interlocked with the insulating center plate.

[0007] Preferably, in the above-mentioned aluminum electrolytic capacitor with good sealing performance, both the anode terminal and the cathode terminal include an external terminal and a connecting post; the external terminal is connected to the connecting post, and the connecting post and the insulating center plate are interlocked and sealed together.

[0008] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the anode terminal and the cathode terminal are provided with protrusions and / or grooves, and the portion of the insulating center plate connected to the anode terminal and the cathode terminal is provided with grooves and / or protrusions that match the protrusions and / or grooves.

[0009] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the side of the aluminum outer ring has a positioning welding step for the outer shell.

[0010] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the width of the positioning welding step is greater than or equal to the thickness of the opening end of the outer casing.

[0011] Compared with the prior art, the advantages of this utility model are as follows: In this utility model, the aluminum outer edge ring of the cover plate and the outer shell are connected by laser welding to replace the rolling and extrusion sealing of the transmission, resulting in a better sealing effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the aluminum electrolytic capacitor with good sealing performance in Example 1.

[0013] Figure 2 This is a cross-sectional view of the aluminum electrolytic capacitor with good sealing performance in Example 1.

[0014] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0015] Figure 4 This is a schematic diagram of the cover plate in Example 1.

[0016] Figure 5 This is a schematic diagram of the cover plate in Example 2.

[0017] Legend 1. Cover plate; 11. Insulating center plate; 111. Recessed hole; 12. Aluminum outer ring; 121. Positioning welding step; 2. Core package; 3. Outer shell; 4. Sleeve; 5. Anode terminal; 6. Cathode terminal; 7. External terminal; 8. Connecting post. Detailed Implementation

[0018] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0019] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0020] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention. Example 1

[0021] like Figures 1-3The aluminum electrolytic capacitor shown includes a cover plate 111, a core 2, and a housing 3. The cover plate 111 seals the core 2 inside the housing 3, and a sleeve 4 is fitted onto the housing 3. The cover plate 111 includes an insulating center plate and an aluminum outer ring 12, which are interlocked and sealed together. The aluminum outer ring 12 is sealed to the housing 3 by laser welding.

[0022] In this embodiment, Figures 1-4 The outer edge of the insulating center plate shown has protrusions and grooves, and the inner side of the aluminum outer edge has grooves and protrusions that match the protrusions and grooves. The protrusions and grooves on the insulating center plate and the grooves and protrusions on the aluminum outer edge are interlocked.

[0023] In this embodiment, an anode terminal 5 and a cathode terminal 6 are sealed and connected to the insulating center plate; the anode terminal 5 and the cathode terminal 6 are interlocked with the insulating center plate. Both the anode terminal 5 and the cathode terminal 6 include an external terminal 7 and a connecting post 8; the external terminal 7 is connected to the connecting post 8, and the connecting post 8 is interlocked and sealed with the insulating center plate. In this embodiment, the connecting post 8 is provided with protrusions and grooves for interlocking, and the portion where the insulating center plate connects to the connecting post 8 is also provided with grooves and protrusions that match the protrusions and grooves on the connecting post 8. In this embodiment, the external terminal 7 can be integrally formed with the connecting post 8, or it can be separately provided and connected together by resistance welding, laser welding, ultrasonic welding, riveting, or a combination of multiple processes.

[0024] In this embodiment, the core package 2 is made of an anode foil, electrolytic paper and a cathode foil wound together. An anode guide foil strip and a cathode guide foil strip are riveted to the anode foil and the cathode foil respectively. The anode guide foil strip and the cathode guide foil strip are electrically connected to the connecting post 8 of the anode terminal 5 and the connecting post 8 of the cathode terminal 6 respectively.

[0025] In this embodiment, the material of the insulating center plate can be phenolic resin, PEEK, POM, PPS, nylon, etc. During molding, injection molding is used to integrally form the insulating center plate, anode terminal 5, cathode terminal 6, and aluminum outer ring 12.

[0026] In other implementations of this embodiment, the anode terminal 5 and the cathode terminal 6 may only have protrusions or grooves, and the part of the insulating center plate that connects to the anode terminal 5 and the cathode terminal 6 may only have matching grooves or protrusions; the aluminum outer ring 12 may only have protrusions or grooves, and the part of the insulating center plate that connects to the aluminum outer ring 12 may only have matching grooves or protrusions.

[0027] In this embodiment, as Figures 2-4As shown, the side of the aluminum outer ring 12 has a positioning welding step 121 for the outer shell 3. The width of the positioning welding step 121 is greater than or equal to the thickness of the opening end of the outer shell 3. During laser welding, the aluminum outer ring 12 of the cover plate 111 rests on the outer shell 3 through the positioning welding step 121, thus completing the positioning between the cover plate 111 and the outer shell 3; therefore, the traditional waisting is not needed for positioning and for supporting the cover plate 111 when the outer shell 3 is rolled. The width of the positioning welding step 121 is greater than or equal to the thickness of the opening end of the outer shell 3, so that after laser welding is completed, the aluminum outer ring 12 of the cover plate 111 can completely cover the outer shell 3.

[0028] In this embodiment, the aluminum outer edge ring 12 of the cover plate 111 is laser-welded to the outer shell 3 to replace the rolling and extrusion sealing of the transmission, which has a better sealing effect and thus ensures the life of the aluminum electrolytic capacitor. Example 2

[0029] In Example 1, as Figures 1-4 As shown, when a connecting piece is provided at the bottom of the external terminal 7, and the connecting piece has a certain thickness, the connecting piece of the external terminal 7 will form a protrusion on the insulating center plate. This protrusion will prevent the cover plate 111 from being tightly attached to the circuit board during use. In this embodiment, as... Figure 5 As shown, the thickness of the center of the insulating center plate is less than the thickness of the edge, thus forming a recess 111 in the middle; the connecting piece is disposed in the recess 111, so that no protrusion is formed on the insulating center plate. The other parts of this embodiment are the same as those of embodiment 1.

Claims

1. An aluminum electrolytic capacitor with good sealing performance, characterized in that: The device includes a cover plate, a core package, and a housing. The cover plate seals the core package within the housing. The cover plate includes an insulating center plate and an aluminum outer ring, which are interlocked and sealed together. The aluminum outer ring is sealed to the housing by laser welding.

2. The aluminum electrolytic capacitor with good sealing performance according to claim 1, characterized in that: The outer edge of the insulating center plate is provided with protrusions and / or grooves, and the inner side of the aluminum outer edge is provided with grooves and / or protrusions that match the protrusions and / or grooves.

3. The aluminum electrolytic capacitor with good sealing performance according to claim 1, characterized in that: The insulating center plate is sealed with an anode terminal and a cathode terminal; the anode terminal and the cathode terminal are interlocked with the insulating center plate.

4. The aluminum electrolytic capacitor with good sealing performance according to claim 3, characterized in that: Both the anode terminal and the cathode terminal include an external terminal and a connecting post; the external terminal is connected to the connecting post, and the connecting post and the insulating center plate are interlocked and sealed together.

5. The aluminum electrolytic capacitor with good sealing performance according to claim 3, characterized in that: The anode terminal and cathode terminal are provided with protrusions and / or grooves, and the portion of the insulating center plate that connects to the anode terminal and cathode terminal is provided with grooves and / or protrusions that match the protrusions and / or grooves.

6. The aluminum electrolytic capacitor with good sealing performance according to claim 1, characterized in that: The side of the aluminum outer ring has a positioning welding step for the outer shell.

7. The aluminum electrolytic capacitor with good sealing performance according to claim 6, characterized in that: The width of the positioning welding step is greater than or equal to the thickness of the opening end of the outer shell.

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