A type of aluminum electrolytic capacitor with good sealing performance

Abstract

An aluminum electrolytic capacitor with good sealing performance includes a shell, a cover plate, and a core package. The core package is sealed inside the shell by the cover plate. The cover plate includes a rubber seal and a rigid substrate. The rubber seal is disposed on and wraps around the outer edge of the rigid substrate. The shell is sealed to the rubber seal after being rolled up. In this invention, the rubber seal on the outer edge of the rigid substrate increases the contact area between the cover plate and the shell, thereby improving the sealing effect of the aluminum electrolytic capacitor after assembly.

Description

Technical Field

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

[0002] The most common failure mode in the life test of aluminum electrolytic capacitors is leakage. In addition to leakage when the explosion-proof valve is open, another type is leakage at the cover plate end. When too much gas is generated by the internal reaction of the product and cannot be discharged in time, or when the hardness of the cover plate material and the sealing of the structure are insufficient, when too much gas accumulates inside and the internal pressure is too high, leakage will occur prematurely, leading to product failure.

[0003] In aluminum electrolytic capacitors, conventional cover plates are usually made of rubber and phenolic paperboard pressed or bonded together and stamped as a whole. The cover plate is not hard enough and the round side surface of the cover plate is not smooth enough, resulting in insufficient mechanical strength and insufficient contact with the aluminum shell, thus posing a risk of leakage or insufficient sealing. Utility Model Content

[0004] 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.

[0005] 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, including a shell, a cover plate and a core package, wherein the core package is sealed inside the shell by the cover plate; the cover plate includes a rubber seal and a rigid substrate, wherein the rubber seal is disposed on the outer edge of the rigid substrate and wraps around the outer edge of the rigid substrate; the shell is sealed with the rubber seal after the edge is rolled.

[0006] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, a ring of protrusions is provided on the outer edge of the rigid substrate, which is sealed and connected to a rubber seal, and the rubber seal wraps around the protrusions from the outside of the rigid substrate.

[0007] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the top and bottom of the rubber seal are flush with the top and bottom of the rigid substrate, respectively.

[0008] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the rubber seal covers the bottom of the rigid substrate.

[0009] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the rubber seal covers the top and sides of the rigid substrate.

[0010] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, a notch is provided at the bottom of the side of the rigid substrate, and the bottom of the rubber seal is disposed within the notch; and the bottom of the rubber seal is flush with the bottom of the side of the rigid substrate.

[0011] Preferably, in the aforementioned aluminum electrolytic capacitor with good sealing performance, the rubber seal covers the top, bottom, and sides of the rigid substrate.

[0012] Compared with the prior art, the advantages of this utility model are: by setting the rubber sealing element on the outer edge of the rigid substrate, the contact surface between the cover plate and the outer shell can be increased, thereby improving the sealing effect of the aluminum electrolytic capacitor after the aluminum electrolytic capacitor assembly is completed. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cover plate of the aluminum electrolytic capacitor with good sealing performance in Example 1.

[0014] Figure 2 This is a schematic diagram of the cover plate of the aluminum electrolytic capacitor with good sealing performance in Example 2.

[0015] Figure 3 This is a schematic diagram of the cover plate of the aluminum electrolytic capacitor with good sealing performance in Example 3.

[0016] Figure 4 This is a schematic diagram of the cover plate of the aluminum electrolytic capacitor with good sealing performance in Example 4.

[0017] Legend

[0018] 1. Cover plate; 11. Rubber seal; 12. Rigid substrate; 121. Protrusion; 122. Notch; 2. Anode lead-out terminal; 3. Cathode lead-out terminal; 4. External terminal; 5. Aluminum rivet; 6. Washer. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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

[0022] like Figure 1The diagram shows a well-sealed aluminum electrolytic capacitor, comprising a casing, a cover plate 1, and a core package, the core package being sealed within the casing by the cover plate 1. In this embodiment, the core package is formed by winding an anode foil, electrolytic paper, and a cathode foil; the core package is impregnated with an electrolyte. An anode conductive strip and a cathode conductive strip are riveted to the anode foil and cathode foil, respectively; the anode conductive strip and the cathode conductive strip are electrically connected to the anode lead-out terminal 2 and the cathode lead-out terminal 3, respectively. The anode lead-out terminal 2 and the cathode lead-out terminal 3 have the same structure, both including an external terminal 4, an aluminum rivet 5, and a washer 6; as shown... Figure 1 As shown, the external terminal 4 is located on the top of the cover plate 1. The aluminum rivet 5 passes through the cover plate 1 and is connected to the washer 6. With the cooperation of the washer 6, the external terminal 4 is firmly fixed to the cover plate 1 by the aluminum rivet 5, and forms a compression with the upper surface of the cover plate 1, thereby sealing the external terminal 4 and the cover plate 1.

[0023] In this embodiment, as Figure 1 As shown, the cover plate 1 includes a rubber seal 11 and a rigid substrate 12. The rigid material can be made of high-temperature resistant nylon or phenolic resin. The rubber seal 11 and the rigid substrate 12 are pressed or bonded together, and the entire plate is stamped. The rubber seal 11 wraps around the top and sides of the rigid substrate 12, thus forming a semi-enclosed structure. The rolled edge of the outer shell is sealed to the rubber seal 11. The external terminals 4 of the anode lead-out terminal 2 and the cathode lead-out terminal 3 are sealed by the cooperation of aluminum rivets 5 and washers 6, which compress the external terminals 4 against the rubber seal 11.

[0024] In this embodiment, a notch 122 is provided at the bottom of the side of the rigid substrate 12, and the bottom of the rubber seal 11 is disposed in the notch 122, thereby forming a structure in which the rubber seal 11 wraps around the side of the rigid substrate 12; and the bottom of the rubber seal 11 is flush with the bottom of the side of the rigid substrate 12.

[0025] In this embodiment, during assembly, the top edge of the opening of the outer casing is rolled, causing the rolled edge of the outer casing to be pressed into the rubber seal 11, thereby sealing it. In this embodiment, since the side of the cover plate 1 is a rubber seal 11, after the cover plate 1 is inserted into the outer casing and the waist is tightened and the edge is rolled, the outer casing will exert a certain amount of pressure on the rubber seal 11 on the side of the cover plate 1, thereby improving the sealing effect. In this embodiment, the provision of the rubber seal 11 on the outer edge of the rigid substrate 12 can increase the contact surface between the cover plate 1 and the outer casing, thereby improving the sealing effect of the aluminum electrolytic capacitor after assembly. Example 2

[0026] like Figure 2As shown, in this embodiment, the rubber seal 11 covers the top, bottom, and sides of the rigid substrate 12, thereby forming a fully enclosed structure. No notch 122 is provided at the bottom of the side of the rigid substrate 12. In this embodiment, after the washer 6 is connected to the aluminum rivet 5, the compression of the rubber seal 11 at the bottom of the rigid substrate 12 by the washer 6 also increases the sealing between the anode lead-out terminal 2 and the cathode lead-out terminal 3 and the cover plate 1. Other parts of this embodiment are the same as in Embodiment 1. Example 3

[0027] like Figure 3 As shown, in this embodiment, a ring of protrusions 121 is provided on the outer edge of the rigid substrate 12, which is sealed and connected to the rubber seal 11. The rubber seal 11 wraps around the protrusions 121 from the outside of the rigid substrate 12. The top and bottom of the rubber seal 11 are flush with the top and bottom of the rigid substrate 12, respectively. In this embodiment, the aluminum rivets 5 of the anode lead-out terminal 2 and the cathode lead-out terminal 3 are preset inside the rigid substrate 12 and are sealed and connected to the rigid substrate 12; the external terminal 4 can be electrically connected to the aluminum rivets 5, and the washer 6 is not required. In this embodiment, since the aluminum rivets 5 are directly sealed to the rigid substrate 12, only the sealing performance of the rolled edge of the outer shell needs to be considered. The other parts of this embodiment are the same as those in embodiment 1. Example 4

[0028] like Figure 4 As shown, the rubber seal 11 covers the bottom of the rigid substrate 12; the other parts of this embodiment are the same as those in embodiment 3.

Claims

1. An aluminum electrolytic capacitor having excellent sealing properties, characterized by: The device includes an outer shell, a cover plate, and a core package. The core package is sealed inside the outer shell by the cover plate. The cover plate includes a rubber seal and a rigid substrate. The rubber seal is disposed on and wraps around the outer edge of the rigid substrate. The outer shell is rolled up and sealed to the rubber seal. The outer edge of the rigid substrate has a ring of protrusions that are sealed to the rubber seal. The rubber seal wraps around the protrusions from the outside of the rigid substrate. The top and bottom of the rubber seal are flush with the top and bottom of the rigid substrate, respectively.

2. The sealed aluminum electrolytic capacitor according to claim 1, wherein: The rubber seal covers the bottom of the rigid substrate.

3. The aluminum electrolytic capacitor with good sealing performance according to claim 1, characterized in that: The anode and cathode leads connected to the core package are sealed to the rigid substrate.

4. The aluminum electrolytic capacitor with good sealing performance according to claim 1, characterized in that: The rubber seal covers the top and sides of the rigid substrate.

5. The aluminum electrolytic capacitor with good sealing performance according to claim 4, characterized in that: The rigid substrate has a notch at the bottom of its side, and the bottom of the rubber seal is located inside the notch; and the bottom of the rubber seal is flush with the bottom of the rigid substrate.

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