Aluminum electrolytic capacitor with good safety performance

Abstract

An aluminum electrolytic capacitor with good safety performance comprises a shell, a core package and a sealing piece, the core package is arranged in the shell through the sealing piece, a vent hole is formed in the bottom of the shell, a waterproof breathable film is arranged on the vent hole, and the waterproof breathable film is tightly attached to the bottom of the shell. According to the utility model, the vent hole and the waterproof breathable film are arranged at the bottom of the shell, so that the generated hydrogen can be discharged in time; and the safety problem caused by the fact that an explosion-proof valve of a traditional aluminum electrolytic capacitor is opened due to excessive hydrogen is solved.

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] Liquid aluminum electrolytic capacitor is immersed with electrolyte on core package, and electrolyte is mainly to repair the oxide film on the surface of anode foil;However, due to the existence of aluminum electrolytic capacitor leakage current, electrolyte can be decomposed to produce hydrogen and other gases, and excessive hydrogen can cause the explosion-proof valve of aluminum electrolytic capacitor to open, and the explosion-proof valve can also be opened by excessive hydrogen in the case of aluminum electrolytic capacitor heating, so as to cause safety accidents. 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 and a sealing element, the core package is arranged in the shell through the sealing element, a ventilation hole is formed in the bottom of the shell, a waterproof and breathable film is arranged on the ventilation hole, and the waterproof and breathable film is tightly attached to the bottom of the shell.

[0005] The aluminum electrolytic capacitor with good safety performance described above is preferably sealed and connected to the bottom of the shell around the waterproof and breathable film through sealing glue, and the middle of the waterproof and breathable film is tightly attached to the ventilation hole in the bottom of the shell.

[0006] The aluminum electrolytic capacitor with good safety performance described above is preferably provided with a cavity in the bottom of the shell, and the waterproof and breathable film is sealed and connected in the cavity by the sealing glue.

[0007] The aluminum electrolytic capacitor with good safety performance described above is preferably sealed and arranged in the bottom of the shell around the waterproof and breathable film through the extrusion plate, the middle of the extrusion plate is provided with a through hole, and the middle of the waterproof and breathable film is tightly attached to the ventilation hole in the bottom of the shell.

[0008] The aluminum electrolytic capacitor with good safety performance described above is preferably sealed and connected to the bottom of the shell by welding the extrusion plate or sealed and connected to the bottom of the shell by the sealing glue.

[0009] The aluminum electrolytic capacitor with good safety performance described above is preferably provided with a cavity in the bottom of the shell, and the waterproof and breathable film and the extrusion plate are sealed and connected in the cavity by the sealing glue.

[0010] For the aluminum electrolytic capacitor with good safety performance, preferably, a cavity is provided at the bottom of the shell, the extrusion plate extrudes the waterproof and breathable film into the cavity, and the extrusion plate is welded to the inner wall of the cavity.

[0011] Compared with the prior art, the advantages of the present invention are that: in the present invention, by providing a vent hole and a waterproof breathable membrane at the bottom of the shell, the generated hydrogen can be discharged in time; and there will be no safety problem caused by the opening of the explosion-proof valve due to excessive hydrogen in traditional aluminum electrolytic capacitors. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0013] Figure 2 This is a schematic structural diagram of an aluminum electrolytic capacitor with good safety performance in Example 2.

[0014] Figure 3 This is a schematic structural diagram of an aluminum electrolytic capacitor with good safety performance in Example 3, in which a through-hole diameter on the extruded plate is less than 1 mm.

[0015] Figure 4 This is a schematic structural diagram of an aluminum electrolytic capacitor with good safety performance and a through-hole diameter greater than 1 mm on an extruded plate in Example 3.

[0016] Figure 5 This is a schematic structural diagram of an aluminum electrolytic capacitor with good safety performance in Example 4.

[0017] Legend

[0018] 1. Shell; 11. Vent; 12. Cavity; 2. Waterproof and breathable membrane; 3. Extruded plate; 31. Through hole; 4. Sealant. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention will be described in more comprehensive and detailed manner below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0020] It should be noted that when an element is described as being "fixed, fixed, connected or communicated with" another element, it can be directly fixed, fixed, connected or communicated with the other element, or it can be indirectly fixed, fixed, connected or communicated with the other element through other intermediate connectors.

[0021] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Example 1

[0022] like Figure 1 A safe aluminum electrolytic capacitor is shown, comprising a housing, a core pack, and a seal. The core pack is positioned within the housing via the seal, which may be a rubber stopper. A vent is formed at the bottom of the housing, and a waterproof, breathable membrane is positioned over the vent. The membrane is tightly attached to the bottom of the housing. In this embodiment, two vents are provided at the bottom of the housing; the number of vents can be adjusted based on the size of the capacitor; the diameter of the vents is generally no greater than 1 mm. In this embodiment, the waterproof, breathable membrane prevents electrolyte impregnated into the core pack within the housing from escaping through the membrane. However, generated hydrogen can pass through the membrane due to the pressure differential between the inside and outside of the housing. When hydrogen is not generated within the core pack, the pressure differential between the inside and outside is consistent, preventing external gas from entering the housing. Since leakage current in aluminum electrolytic capacitors cannot be completely avoided, and due to the presence of electrolyte, the pressure inside the housing will not be less than the external pressure.

[0023] In this embodiment, gases such as hydrogen generated by decomposition of the electrolyte in the core package can pass through the waterproof and breathable membrane and thus be discharged from the outer shell, so the hydrogen remover in the traditional electrolyte can be eliminated.

[0024] In this embodiment, the four sides of the waterproof breathable membrane are directly connected to the bottom of the housing through sealant; the middle of the waterproof breathable membrane is tightly attached to the vent hole at the bottom of the housing.

[0025] In the utility model, by providing a vent hole and a waterproof breathable membrane at the bottom of the shell, the generated hydrogen can be discharged in time; thus, there will be no safety problem caused by the opening of the explosion-proof valve due to excessive hydrogen in traditional aluminum electrolytic capacitors. Example 2

[0026] like Figure 2 As shown, in this embodiment, a cavity is provided at the bottom of the housing, the vent is located within the cavity, and a sealant seals the waterproof, breathable membrane within the cavity. In this embodiment, by providing a cavity at the bottom of the housing and sealing the waterproof, breathable membrane within the cavity using sealant, a more effective sealing connection is achieved. The remainder of this embodiment is identical to that of Example 1. Example 3

[0027] like Figure 3 As shown, the waterproof breathable membrane is sealed on all sides by an extruded plate and is set at the bottom of the housing. A through hole is set in the middle of the extruded plate; the middle of the waterproof breathable membrane is tightly attached to the vent hole at the bottom of the housing. The extruded plate is sealed and connected to the bottom of the housing by welding or by using a sealant. In this embodiment, Figure 3As shown, the through hole in the middle of the extrusion plate can be a through hole with a diameter less than or equal to 1 mm; as Figure 4 As shown, the through hole in the middle of the extrusion plate can also be a through hole with a diameter greater than 1 mm, and a flow channel for gas is formed between the through hole on the bottom of the shell and the through hole on the extrusion plate.

[0028] The other parts of this embodiment are the same as those of Embodiment 1. Embodiment 4

[0029] In this embodiment, as shown, Figure 5 The bottom of the shell is provided with a cavity, and the sealing glue seals and connects the waterproof and breathable film and the extrusion plate in the cavity. In this embodiment, the sealing glue can not be used, but the waterproof and breathable film can be extruded in the cavity by the extrusion plate, and the waterproof and breathable film is sealed and connected to the bottom of the shell in the form of welding between the extrusion plate and the inner wall of the cavity. The other parts of this embodiment are the same as those of Embodiment 3.

Claims

1. An aluminum electrolytic capacitor with good safety performance, characterized by: The invention comprises a shell, a core package and a seal. The core package is arranged in the shell through the seal. A vent hole is opened at the bottom of the shell. A waterproof breathable membrane is arranged on the vent hole. The waterproof breathable membrane is tightly attached to the bottom of the shell.

2. The aluminum electrolytic capacitor with good safety performance according to claim 1, characterized in that: The four sides of the waterproof and breathable membrane are sealed and connected to the bottom of the shell through sealant; the middle part of the waterproof and breathable membrane is tightly attached to the vent hole at the bottom of the shell.

3. The aluminum electrolytic capacitor with good safety performance according to claim 2, characterized in that: A cavity is provided at the bottom of the shell, and the sealant seals and connects the waterproof and breathable membrane in the cavity.

4. The aluminum electrolytic capacitor with good safety performance according to claim 1, characterized in that: The four sides of the waterproof breathable membrane are sealed on the bottom of the shell through an extrusion plate, and a through hole is provided in the middle of the extrusion plate; the middle of the waterproof breathable membrane is tightly attached to the vent hole at the bottom of the shell.

5. The aluminum electrolytic capacitor with good safety performance according to claim 4, characterized in that: The extruded plate is sealed and connected to the bottom of the shell by welding or the extruded plate is sealed and connected to the bottom of the shell by sealant.

6. The aluminum electrolytic capacitor with good safety performance according to claim 5, characterized in that: A cavity is provided at the bottom of the shell, and the sealant seals and connects the waterproof and breathable membrane and the extruded plate in the cavity.

7. The aluminum electrolytic capacitor with good safety performance according to claim 5, characterized in that: The bottom of the shell is provided with a cavity, the extrusion plate extrudes the waterproof and breathable film into the cavity, and the extrusion plate is welded to the inner wall of the cavity.

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