Aluminum electrolytic capacitor with long service life

Abstract

An aluminum electrolytic capacitor long in service life comprises a cover plate, a shell and a core bag, the core bag is arranged in the shell through the cover plate, an exhaust device is arranged on the cover plate and comprises a connecting pipe, an upper end cover and a lower end cover, and the upper end cover and the lower end cover are connected with the connecting pipe through threads or in a welded mode or are integrated. An exhaust hole communicated with the central hole of the connecting pipe is formed in the upper end cover; the lower end cover comprises a lower cover cap and an ejector rod, the ejector rod extends into the connecting pipe, and communicated through holes are formed in the ejector rod and the lower cover cap; a hole blocking assembly is arranged between the ejector rod and the upper end cover. According to the utility model, when the internal pressure intensity of the aluminum electrolytic capacitor is too high, gas rushes through the limitation of the hole plugging assembly through the ejector rod and the through hole in the lower cover cap and is discharged from the exhaust hole in the upper end cover, and the internal gas is discharged, so that the possibility of failure of a product caused by too high internal air pressure is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of aluminum electrolytic capacitors, in particular to a kind of aluminum electrolytic capacitors with long service life. BACKGROUND

[0002] The common failure mode of aluminum electrolytic capacitor is valve leakage. On the one hand, too much gas is generated by physical or chemical reactions inside the product, which cannot be discharged in time. On the other hand, the hardness of the cover plate aluminum shell and other materials is limited, and the explosion-proof ability is limited. When there is too much gas accumulated inside, the internal pressure is too high, the valve will be opened prematurely, causing the product to fail. This phenomenon is particularly prominent in the life test of aluminum electrolytic capacitors. SUMMARY

[0003] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide an aluminum electrolytic capacitor with long service life.

[0004] To solve the above technical problems, the technical scheme provided by the utility model is as follows: an aluminum electrolytic capacitor with long service life, comprising a cover plate, a shell and a core package, the core package is arranged in the shell through the cover plate, an exhaust device is arranged on the cover plate, the exhaust device comprises a connecting pipe, an upper end cover and a lower end cover, the upper end cover and the connecting pipe are connected by threads or welding or are integrally formed, and the lower end cover and the connecting pipe are connected by threads or welding; an exhaust hole is arranged on the upper end cover and communicates with the center hole of the connecting pipe; the lower end cover comprises a lower cap and a jack, the jack extends into the connecting pipe, and the jack and the lower cap are provided with a through hole in communication; a hole plugging assembly is arranged between the jack and the upper end cover.

[0005] In the above-mentioned aluminum electrolytic capacitor with long service life, preferably, the hole plugging assembly comprises a silica gel ball, the silica gel ball is arranged between the jack and the upper end cover, the top of the jack presses against the silica gel ball and forms extrusion on the silica gel ball, and the silica gel ball plugs the through hole in the middle of the jack.

[0006] In the above-mentioned aluminum electrolytic capacitor with long service life, preferably, the hole plugging assembly comprises a partition plate and an elastic extrusion piece, the elastic extrusion piece is arranged between the partition plate and the upper end cover, and the top of the jack presses against the partition plate and forms extrusion on the partition plate and the elastic extrusion piece.

[0007] In the above-mentioned aluminum electrolytic capacitor with long service life, preferably, a groove is arranged at the position where the cover plate and the upper end cover contact, an insulating sleeve is sleeved on the upper end cover, and the bottom of the insulating sleeve extends into the groove.

[0008] In the above-mentioned aluminum electrolytic capacitor with long service life, preferably, a groove is arranged at the position where the cover plate and the lower end cover contact, an insulating sleeve is arranged on the lower end cover, and the bottom of the insulating sleeve extends into the groove.

[0009] The long-life aluminum electrolytic capacitor has the advantages that the sealing connection between the connecting pipe and the cover plate is achieved.

[0010] The long-life aluminum electrolytic capacitor has the advantages that the sealing ring is arranged between the lower cover cap and the cover plate.

[0011] The long-life aluminum electrolytic capacitor has the advantages that the upper end cover and the connecting pipe are integrally formed.

[0012] The long-life aluminum electrolytic capacitor has the advantages that the upper end cover and the cover plate are integrally formed.

[0013] Compared with the prior art, the long-life aluminum electrolytic capacitor has the advantages that when the internal pressure of the aluminum electrolytic capacitor is too high, the gas will rush out of the exhaust hole of the upper end cover through the through hole of the top rod and the lower cover cap, and the internal gas is discharged, so that the possibility of failure of the product caused by the excessive internal gas pressure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structure schematic view of the long-life aluminum electrolytic capacitor in Example 1.

[0015] Figure 2 It is a sectional structure schematic view of the cover plate of the long-life aluminum electrolytic capacitor in Example 1.

[0016] Figure 3 It is a structure schematic view of the upper end cover of the long-life aluminum electrolytic capacitor in Example 1.

[0017] Figure 4 It is a structure schematic view of the upper end cover and the lower end cover of the long-life aluminum electrolytic capacitor in Example 1.

[0018] Figure 5 It is a sectional structure schematic view of the cover plate of the long-life aluminum electrolytic capacitor in Example 2.

[0019] Figure 6 It is a sectional structure schematic view of the cover plate of the long-life aluminum electrolytic capacitor in Example 3.

[0020] Figure 7 It is a sectional structure schematic view of the cover plate of the long-life aluminum electrolytic capacitor in Example 4.

[0021] LEGEND

[0022] 1, cover plate; 11, groove; 2, shell; 3, exhaust device; 31, connecting pipe; 32, upper end cover; 321, exhaust hole; 33, lower end cover; 331, lower cover cap; 332, top rod; 34, sealing ring; 35, insulating sleeve; 36, silica gel ball; 37, partition plate; 38, elastic extrusion piece. DETAILED DESCRIPTION

[0023] For the convenience of understanding the present application, the following will combine the description of the drawings and the preferred embodiments to make a more comprehensive and detailed description of the present application, but the protection scope of the present application is not limited to the following specific embodiments.

[0024] It should be particularly noted that when a certain element is described as "fixed to, fixedly connected to, connected to or communicated to" another element, it can be directly fixed, fixedly connected, connected or communicated to another element, or indirectly fixed, fixedly connected, connected or communicated to another element through other intermediate connecting elements.

[0025] Unless otherwise defined, all the professional terms used in the following have the same meaning as generally understood by those skilled in the art. The professional terms used in this paper are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present application. Embodiment 1

[0026] As shown in Figure 1 A long-life aluminum electrolytic capacitor, comprising a cover plate 1, a shell 2 and a core package, the core package is arranged in the shell 2 through the cover plate 1, and the cover plate 1 is provided with an exhaust device 3. As shown in Figure 2 In this embodiment, the exhaust device 3 is a split structure, the exhaust device 3 comprises a connecting pipe 31, an upper end cover 32 and a lower end cover 33, the upper end cover 32 and the lower end cover 33 are connected with the connecting pipe 31 through threads or welding, the upper end cover 32 is provided with an exhaust hole 321 communicated with the center hole of the connecting pipe 31; the lower end cover 33 comprises a lower cap 331 and a top rod 332, the top rod 332 extends into the connecting pipe 31, the top rod 332 and the lower cap 331 are provided with communicated through holes; the top rod 332 and the upper end cover 32 are provided with a hole plugging assembly. In order to enhance the sealing between the lower cap 331 and the cover plate 1, the connecting pipe 31 and the cover plate 1 are sealed by glue or extrusion connection, and the lower cap 331 and the cover plate 1 are provided with a sealing ring 34; after the lower end cover 33 and the connecting pipe 31 are connected through threads or welding, the lower end cover 33 extrudes the sealing ring 34 to ensure the sealing degree between the lower cap 331 and the cover plate 1.

[0027] In this embodiment, when the lower end cover 33 and the connecting pipe 31 are connected by threads, the lower part of the connecting pipe 31 is provided with internal threads, and the top rod 332 on the lower end cover 33 is provided with external threads matched with the internal threads.

[0028] In this embodiment, the upper end cover 32 can be made of insulating materials such as plastic, or can be made of metal such as aluminum. When it is made of metal, the distance between the upper end cover 32 and the positive and negative lead terminals on the cover plate 1 may be close, which may cause arc discharge. Therefore, as shown inFigure 3 As shown, a groove 11 is provided at the position where the cover plate 1 contacts the upper end cover 32. An insulating sleeve 35 is fitted onto the upper end cover 32, with the bottom of the insulating sleeve 35 extending into the groove 11. To prevent arc discharge between the lower cap and the positive and negative leads, it can be done as follows: Figure 4 As shown, a groove 11 is provided at the position where the cover plate 1 contacts the lower cap, and an insulating sleeve 35 is fitted on the lower cap 331 of the lower end cover 33, with the bottom of the insulating sleeve 35 extending into the groove 11.

[0029] In this embodiment, the plugging assembly includes a silicone ball 36, which is positioned between the push rod 332 and the upper cap 32. The top of the push rod 332 presses against the silicone ball 36, compressing it and blocking the through hole in the middle of the push rod 332. When excessive gas is generated inside the aluminum electrolytic capacitor, causing excessive internal pressure, the gas passes through the through holes on the push rod 332 and the lower cap 331, forcing open the silicone ball 36 and venting out through the vent hole 321 of the upper cap 32, thus reducing the possibility of product failure due to excessive internal pressure. After the internal gas of the aluminum electrolytic capacitor is released, the elasticity of the silicone ball 36 re-blocks the through hole on the push rod 332, thereby reducing the chance of external impurities entering the capacitor. Example 2

[0030] like Figure 5 As shown, in this embodiment, the plugging assembly includes a partition 37 and an elastic compression member 38. The elastic compression member 38 is disposed between the partition 37 and the upper end cap 32. The top of the push rod 332 abuts against the partition 37 and compresses the partition 37 and the elastic compression member 38. A soft rubber layer or a soft plastic layer is disposed at the bottom of the partition 37, and the soft rubber layer or soft plastic layer abuts against the top of the push rod. The elastic compression member 38 can be as follows: Figure 5 The spring pad shown is used to release gas from the aluminum electrolytic capacitor. When excessive gas is generated inside, leading to excessive internal pressure, the gas forces its way through the through holes on the top rod 332 and the lower cap 331, breaking through the partition and escaping through the vent hole 321 on the upper cap 32. This releases the internal gas and reduces the possibility of product failure due to excessive internal pressure. After the internal gas of the aluminum electrolytic capacitor is released, the elasticity of the elastic pressing member 38 causes the partition to re-block the through hole on the top rod 332, thereby reducing the chance of external impurities entering the capacitor.

[0031] The other parts of this embodiment are the same as those in Embodiment 1. Example 3

[0032] like Figure 6As shown, in this embodiment, the upper end cap and the connecting tube are integrally formed and can be made of resin or metal. An internal thread is provided in the central hole of the connecting tube, and the top rod 332 on the lower end cap 33 is provided with an external thread that matches the internal thread. Other parts of this embodiment are the same as in Embodiment 1. In this embodiment, the cover plate, upper end cap, and connecting tube can also be integrally formed. Example 4

[0033] like Figure 7 As shown, in this embodiment, the upper end cap 32 and the cover plate are integrally molded and can be made of resin material. The connecting pipe can be made of resin material or metal material. The other parts of this embodiment are the same as in embodiment 1.

Claims

1. A long-life aluminum electrolytic capacitor comprising a cover plate, a case, and a core package, the core package being disposed in the case by the cover plate, characterized by The cover plate is provided with an exhaust device, the exhaust device comprises a connecting pipe, an upper end cover and a lower end cover, the upper end cover is connected with the connecting pipe through thread or welding or is integrally formed, the lower end cover is connected with the connecting pipe through thread or welding, the upper end cover is provided with an exhaust hole which is communicated with the center hole of the connecting pipe, the lower end cover comprises a lower cover cap and a top rod, the top rod extends into the connecting pipe, the top rod and the lower cover cap are provided with communicated through holes, and a hole plugging assembly is arranged between the top rod and the upper end cover.

2. The long life aluminum electrolytic capacitor according to claim 1, characterized by: The hole plugging assembly comprises a silica gel ball, the silica gel ball is arranged between the top rod and the upper end cover, the top of the top rod presses against the silica gel ball and forms extrusion to the silica gel ball, and the silica gel ball plugs the through hole in the middle of the top rod.

3. The long life aluminum electrolytic capacitor of claim 1 wherein: The hole plugging assembly comprises a partition plate and an elastic extrusion piece, the elastic extrusion piece is arranged between the partition plate and the upper end cover, the top of the top rod presses against the partition plate and forms extrusion to the partition plate and the elastic extrusion piece.

4. The long life aluminum electrolytic capacitor as claimed in any one of claims 1 to 3, characterized by: The position where the cover plate and the upper end cover are in contact is provided with a groove, an insulating sleeve is sleeved on the upper end cover, and the bottom of the insulating sleeve extends into the groove.

5. The long life aluminum electrolytic capacitor as claimed in any one of claims 1 to 3, characterized by: The connecting pipe and the cover plate are sealingly connected.

6. The long life aluminum electrolytic capacitor as claimed in any one of claims 1 to 3, characterized by: A sealing ring is arranged between the lower cover cap and the cover plate.

7. The long life aluminum electrolytic capacitor as claimed in any one of claims 1 to 3, characterized by: The upper end cover and the connecting pipe are integrally formed.

8. The long life aluminum electrolytic capacitor as claimed in any one of claims 1 to 3, characterized by: The upper end cover and the cover plate are integrally formed.

9. The long life aluminum electrolytic capacitor as claimed in any one of claims 1 to 3, characterized by: The position where the cover plate and the lower end cover are in contact is provided with a groove, an insulating sleeve is arranged on the lower end cover, and the bottom of the insulating sleeve extends into the groove.

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