An aluminum electrolytic capacitor

Abstract

An aluminum electrolytic capacitor comprises a core package, a shell and a sealing element, the core package is sealed in the shell by the sealing element; the sealing element comprises a partition plate and a sealing glue, the partition plate is arranged at the top of the core package, the sealing glue is arranged above the partition plate to form a sealing glue layer, and the sealing glue layer is sealingly connected with the shell, an anode lead pin and a cathode lead pin; a soaking hole is arranged at the bottom of the shell and is sealed by a bottom cover. In the utility model, the partition plate and the sealing glue layer replace the traditional rubber plug, the size of the aluminum electrolytic capacitor is further reduced, and the sealing effect of the aluminum electrolytic capacitor is better than that of the rubber plug under the action of the sealing glue layer.

Description

Technical Field

[0001] This utility model relates to an aluminum electrolytic capacitor, and more particularly to a small-sized aluminum electrolytic capacitor. Background Technology

[0002] Currently, small-sized aluminum electrolytic capacitors typically use rubber plugs combined with waist-shaped and rolled-edge seals for sealing. However, rubber plugs have a certain thickness, requiring a large space inside the casing, which contradicts the current trend of component miniaturization. Furthermore, the seal between the rubber plug and the casing is achieved by squeezing the rubber plug; at high temperatures or when the aluminum electrolytic capacitor heats up, electrolyte can easily leak from the joint between the casing and the rubber plug, thus affecting its lifespan. Utility Model Content

[0003] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a small-sized aluminum electrolytic capacitor.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: an aluminum electrolytic capacitor, including a core, a shell, and a sealing element, wherein the core is sealed inside the shell by the sealing element; the sealing element includes a partition and a sealant, wherein the partition is disposed on the top of the core, and a sealant layer is disposed above the partition to form a sealant layer, and the sealant layer is sealed to the shell, the anode lead, and the cathode lead.

[0005] Preferably, in the aforementioned aluminum electrolytic capacitor, the separator is circular, and the outer side wall of the separator is in contact with the inner side wall of the outer casing.

[0006] Preferably, in the aluminum electrolytic capacitor described above, the separator is provided with receiving holes for anode and cathode leads, the aluminum stems of the anode and cathode leads are disposed in the receiving holes, and the sidewalls of the aluminum stems are in contact with the inner sidewalls of the receiving holes.

[0007] In the aforementioned aluminum electrolytic capacitor, preferably, the open end of the outer casing is bent inward to form a fixing part after the partition is placed inside the casing.

[0008] Preferably, in the aluminum electrolytic capacitor described above, the sealant fills the cavity formed between the top of the outer casing and the partition.

[0009] Compared with the prior art, the advantages of this utility model are: the use of a partition and a sealing layer instead of a traditional rubber stopper in this utility model can further reduce the size of the aluminum electrolytic capacitor; at the same time, the sealing effect of the aluminum electrolytic capacitor is better than that of the rubber stopper under the action of the sealing layer. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the aluminum electrolytic capacitor in Example 1.

[0011] Figure 2 This is a schematic diagram of the exploded structure of the aluminum electrolytic capacitor in Example 1.

[0012] Legend 1. Outer shell; 11. Fixing part; 2. Core package; 3. Sealing element; 31. Partition plate; 32. Sealing layer; 4. Bottom cover; 5. Anode guide pin; 6. Cathode guide pin; 7. Aluminum rod. Detailed Implementation

[0013] 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.

[0014] 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.

[0015] 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

[0016] like Figure 1 and Figure 2 The aluminum electrolytic capacitor shown is a small-sized capacitor, such as one with a diameter of 5mm or 6mm. This embodiment of the aluminum electrolytic capacitor includes a core package 2, a housing 1, and a sealing element 3. The core package 2 is sealed inside the housing 1 by the sealing element 3. The core package 2 is formed by winding an anode foil, electrolytic paper, and a cathode foil. An anode guide pin 5 and a cathode guide pin 6 are riveted to the anode foil and cathode foil, respectively. An impregnation hole is provided at the bottom of the housing, and the impregnation hole is sealed by a bottom cover 4. In this embodiment, the sealing element 3 includes a partition 31 and sealant. The partition 31 is disposed on the top of the core package 2 and contacts the top of the core package. The top of the core package refers to one end of the anode and cathode guide pins on the core package. A sealant layer 32 is formed above the partition 31, and the sealant layer 32 is sealed to the housing 1, the anode guide pin 5, and the cathode guide pin 6. In this embodiment, the partition 31 is made of insulating material, such as resin board; the partition 31 can be rigid or flexible; the partition 31 mainly serves to isolate and prevent the sealant from flowing onto the core package 2 before it is cured.

[0017] In this embodiment, since the outer shell 1 is cylindrical, the partition 31 is circular, and the outer side wall of the partition 31 contacts the inner side wall of the outer shell 1. The partition 31 is provided with receiving holes for the anode guide pin 5 and the cathode guide pin 6. The aluminum stems 7 of the anode guide pin 5 and the cathode guide pin 6 are disposed within the receiving holes, and the side wall of the aluminum stems 7 contacts the inner side wall of the receiving holes. The partition 31 is preferably soft, so that it can be pressed against the outer shell 1, facilitating the installation of the partition 31. Furthermore, because the soft partition 31 is pressed against the outer shell 1 and against the aluminum stems 7 of the anode guide pin 5 and the cathode guide pin 6, the sealant will not flow below the partition 31 before it has cured.

[0018] This embodiment also provides a method for preparing an aluminum electrolytic capacitor, including the following steps: 1) Wind the anode foil, electrolytic paper, and cathode foil into a core package; 2) Insert the anode guide pin 5 and cathode guide pin 6 on the core package 2 into the receiving hole of the partition plate 31; and press the partition plate 31 to the position of the aluminum stem 7 of the anode guide pin 5 and cathode guide pin 6; 3) Insert the core package 2 and the partition plate 31 together into the outer casing 1; 4) Bend the open end of the outer casing 1 inward to form a fixing part 11; 5) Inject sealant onto the top of the partition 31, filling the cavity between the fixing part 11 and the partition 31; then heat to cure. 6) Impregnate the outer casing 1 and the core package 2 together with the electrolyte; 7) The bottom cover 4 is laser welded to the outer shell 1 to seal the impregnation hole.

[0019] In this embodiment, after the partition 31 is placed inside the outer shell 1, the open end of the outer shell 1 is bent inward to form a fixing part 11. Sealant fills the cavity formed between the bent top of the outer shell 1 and the partition 31. In this embodiment, during assembly, the anode guide pin 5 and cathode guide pin 6 on the core package 2 are first inserted into the receiving holes of the partition 31; and the partition 31 is then positioned at the position of the aluminum stems 7 of the anode guide pin 5 and cathode guide pin 6; then the core package 2 and the partition 31 are inserted together into the outer shell 1; the open end of the outer shell 1 is then bent inward to form a fixing part 11, thus fixing the partition 31 inside the outer shell 1; finally, sealant is injected onto the partition 31, filling the cavity formed between the fixing part 11 and the partition 31; then it is heated and cured. During the curing of the sealant, the core package is not impregnated with electrolyte; otherwise, during curing, the evaporation of the electrolyte would generate bubbles in the sealant layer, affecting the sealing effect. After the sealant is heated and cured to form a sealant layer, the outer shell and the core package are impregnated with electrolyte. The electrolyte enters the core package through the impregnation hole on the outer shell, thus impregnating the core package with electrolyte. Finally, the impregnation hole is sealed with the bottom cover 4 by laser welding, thus completing the assembly of the aluminum electrolytic capacitor. In this embodiment, since the partition 31 is fixed inside the outer shell 1 by the fixing part 11, and the cavity formed between the fixing part 11 and the partition 31 is filled with sealant, the sealing effect after curing is better than that of traditional rubber plugs with waisting and rolled edge sealing under the action of the sealant layer 32.

[0020] In this embodiment, replacing the traditional rubber stopper with a partition 31 and a sealing layer 32 can further reduce the size of the aluminum electrolytic capacitor; at the same time, the sealing effect of the aluminum electrolytic capacitor is better than that of the rubber stopper under the action of the sealing layer 32.

Claims

1. An aluminum electrolytic capacitor, comprising a core, a housing, and a seal, wherein the core is sealed within the housing by the seal; characterized in that: The sealing element includes a partition and a sealant. The partition is disposed on the top of the core package, and a sealant layer is disposed above the partition to form a sealant layer. The sealant layer is sealed to the outer shell, the anode guide needle, and the cathode guide needle. An impregnation hole is disposed at the bottom of the outer shell, and the impregnation hole is sealed by a bottom cover.

2. The aluminum electrolytic capacitor according to claim 1, characterized in that: The partition is circular, and its outer sidewall is in contact with the inner sidewall of the outer shell.

3. The aluminum electrolytic capacitor according to claim 2, characterized in that: The partition plate is provided with receiving holes for anode and cathode guide pins, and the aluminum stems of the anode and cathode guide pins are disposed in the receiving holes, with the sidewalls of the aluminum stems in contact with the inner sidewalls of the receiving holes.

4. The aluminum electrolytic capacitor according to claim 1, characterized in that: After the partition is placed inside the outer shell, the open end of the outer shell is bent inward to form a fixing part.

5. The aluminum electrolytic capacitor according to claim 4, characterized in that: The sealant fills the cavity formed between the top of the outer shell and the partition after bending.

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