Ox horn type aluminum electrolytic capacitor

Abstract

The utility model discloses an ox horn type aluminum electrolytic capacitor, and the capacitor comprises an aluminum housing, and the bottom wall of the aluminum housing is provided with a pressure valve. The sleeve is arranged on the aluminum shell in a sleeving manner; the gasket assembly is clamped and fixed between the bottom wall of the aluminum shell and the sleeve, the pressure valve and the gasket assembly are oppositely arranged, the gasket assembly comprises a first flame-retardant gasket and a second flame-retardant gasket which are stacked, the first flame-retardant gasket is located on the side, close to the pressure valve, of the second flame-retardant gasket, and the second flame-retardant gasket is filled with a liquid absorption material; and the liquid absorbing material is used for absorbing the electrolyte discharged from the pressure valve. According to the technical scheme of the embodiment of the invention, the first flame-retardant gasket and the second flame-retardant gasket which are stacked are configured, the second flame-retardant gasket is filled with the liquid absorption material, and the second flame-retardant gasket can quickly absorb the sprayed electrolyte, so that the protection performance of the gasket assembly is remarkably improved, and the service life of the gasket assembly is prolonged. The electrolyte is effectively prevented from being jetted to a high-energy area of the circuit board, so that the potential safety hazard of the ox horn capacitor is reduced.

Description

Technical Field

[0001] The utility model generally relates to the field of capacitors, and in particular to a horn-type aluminum electrolytic capacitor. Background Art

[0002] Horn capacitors typically feature a pressure valve on the bottom wall of their aluminum shell. This valve is triggered to release pressure when the internal pressure reaches the threshold. Once triggered, electrolyte vapor within the aluminum shell is ejected through the valve, potentially spraying into high-energy areas of the circuit board, posing a potential fire hazard. Existing capacitors are equipped with a plastic gasket at the bottom. While this provides some protection against electrolyte spray, its performance is poor and urgently needs improvement. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a horn-type aluminum electrolytic capacitor.

[0004] The present application provides a horn-type aluminum electrolytic capacitor, comprising:

[0005] Aluminum shell, the bottom wall of the aluminum shell is provided with a pressure valve;

[0006] A sleeve, the sleeve is sleeved on the aluminum shell;

[0007] A gasket assembly is clamped between the bottom wall of the aluminum shell and the sleeve, and the pressure valve and the gasket assembly are arranged opposite to each other. The gasket assembly includes a first flame-retardant gasket and a second flame-retardant gasket stacked together, and the first flame-retardant gasket is located on the side of the second flame-retardant gasket close to the pressure valve. The interior of the second flame-retardant gasket is filled with liquid-absorbing material, which is used to absorb the electrolyte discharged from the pressure valve.

[0008] Furthermore, an adhesive layer is provided between the first flame retardant gasket and the second flame retardant gasket.

[0009] Furthermore, the liquid-absorbing material is liquid-absorbing powder, the second flame-retardant gasket includes a flame-retardant gasket body, the flame-retardant gasket body is formed with a filling cavity, and the liquid-absorbing powder is filled into the filling cavity.

[0010] Furthermore, the flame retardant gasket body is made of polypropylene non-woven fabric.

[0011] Furthermore, the liquid absorbing material includes sodium polyacrylate powder.

[0012] Furthermore, the liquid absorbing material includes activated carbon powder.

[0013] Furthermore, the first flame retardant gasket is a polypropylene gasket.

[0014] Furthermore, a core package is provided inside the aluminum shell, which includes a stacked anode layer and a cathode layer, an electrolytic paper layer is provided between the anode layer and the cathode layer, and the electrolytic paper layer includes an electrolytic paper body, and the side of the electrolytic paper body close to the anode layer is covered with a polyolefin porous membrane.

[0015] According to the technical solution provided in the embodiment of the present application, by configuring a stacked first flame-retardant gasket and a second flame-retardant gasket, the interior of the second flame-retardant gasket is filled with a liquid-absorbing material. When the electrolyte in the bull-horn aluminum electrolytic capacitor is sprayed out through the pressure valve, the second flame-retardant gasket can quickly absorb the sprayed electrolyte, significantly improving the protective performance of the gasket assembly, effectively preventing the electrolyte from being sprayed in the high-energy area of ​​the circuit board, and thereby reducing the safety hazards of the bull-horn capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 Schematic diagram of the structure of the horn-type aluminum electrolytic capacitor in this embodiment;

[0018] Figure 2 Schematic diagram of the cross section of the electrolytic paper in this embodiment. DETAILED DESCRIPTION

[0019] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Please refer to Figure 1This embodiment provides a bullhorn-type aluminum electrolytic capacitor, comprising an aluminum shell 100, a sleeve 200, and a gasket assembly 300. A pressure valve 600 is provided on the bottom wall of the aluminum shell 100. The sleeve 200 is sleeved on the aluminum shell 100. The gasket assembly 300 is clamped between the bottom wall of the aluminum shell 100 and the sleeve 200, and the pressure valve 600 and the gasket assembly 300 are arranged opposite each other. The gasket assembly 300 includes a first flame-retardant gasket 310 and a second flame-retardant gasket 320 stacked together, with the first flame-retardant gasket 310 located on the side of the second flame-retardant gasket 320 closer to the pressure valve 600. Both the first flame-retardant gasket 310 and the second flame-retardant gasket 320 are made of flame-retardant materials to provide good flame-retardant properties and prevent combustion. The interior of the second flame-retardant gasket 320 is filled with a liquid-absorbing material 322, which is used to absorb the electrolyte discharged from the pressure valve 600. This ensures that the electrolyte ejected from the pressure valve 600 is substantially absorbed by the liquid-absorbing material 322, effectively preventing the electrolyte from being sprayed onto high-energy areas of the circuit board. The first flame-retardant gasket 310 forms a second layer of protection behind the first flame-retardant gasket 310, improving the gasket assembly 300's flame retardancy and protection against electrolyte spray.

[0022] In this embodiment, by configuring a stacked first flame-retardant gasket 310 and a second flame-retardant gasket 320, the interior of the second flame-retardant gasket 320 is filled with a liquid-absorbing material 322. When the electrolyte in the bull-horn aluminum electrolytic capacitor is sprayed out through the pressure valve 600, the second flame-retardant gasket 320 can quickly absorb the sprayed electrolyte, significantly improving the protective performance of the gasket assembly 300, effectively preventing the electrolyte from being sprayed in the high-energy area of ​​the circuit board, avoiding the occurrence of fire, and thereby reducing the safety hazards of the bull-horn capacitor.

[0023] The sleeve 200 is a heat shrinkable sleeve 200 and its material can be but is not limited to PVC. After heating, the sleeve 200 shrinks and is fastened to the outer periphery of the aluminum shell 100, and the gasket assembly 300 is clamped between the sleeve 200 and the bottom wall of the aluminum shell 100.

[0024] The bottom of the sleeve 200 may be provided with an opening 201 to expose a portion of the gasket assembly 300 .

[0025] The pressure valve 600 may be a pressure groove provided on the bottom wall of the aluminum shell 100 ; or a silicone rubber pressure valve 600 , with an installation through hole provided on the bottom wall of the aluminum shell 100 , and the silicone rubber pressure valve 600 is filled and installed in the installation through hole.

[0026] The first flame retardant gasket 310 is a polypropylene gasket, which not only has good flame retardant properties but also has a certain hardness, and can provide good support for the second flame retardant gasket 320 .

[0027] In some embodiments of the present application, an adhesive layer is provided between the first flame retardant gasket 310 and the second flame retardant gasket 320, and the two are bonded and fixed by the adhesive layer to avoid relative displacement between the two, thereby ensuring the protective function of the gasket assembly 300, and also facilitating the assembly and transportation of the gasket assembly 300.

[0028] The adhesive layer may be a double-sided tape or formed by curing a glue liquid, and this application does not impose any restrictions on this.

[0029] Of course, in other embodiments, the above-mentioned adhesive layer may not be provided between the first flame retardant gasket 310 and the second flame retardant gasket 320 .

[0030] In some embodiments of the present application, the liquid-absorbing material 322 is liquid-absorbing powder, and the second flame-retardant gasket 320 includes a flame-retardant gasket body, which is formed with a filling cavity, and the liquid-absorbing powder is filled into the filling cavity.

[0031] The flame-retardant gasket body has a porous structure that allows electrolyte vapor to pass through the porous structure, thereby facilitating electrolyte absorption by the liquid-absorbing powder. The flame-retardant gasket body may be made of, but is not limited to, a polypropylene non-woven fabric. The particle size of the liquid-absorbing powder is larger than the mesh size of the polypropylene non-woven fabric to prevent leakage of the liquid-absorbing powder from the flame-retardant gasket body.

[0032] The flame retardant gasket body may be, but is not limited to, a circumferentially closed bag-like structure, wherein the cavity of the bag forms a filling cavity. For example, the flame retardant gasket body may be formed by at least two layers of polypropylene non-woven fabrics that are circumferentially sealed.

[0033] The liquid absorbing material 322 can be sodium polyacrylate powder or activated carbon powder, or the liquid absorbing material 322 can be sodium polyacrylate powder and activated carbon powder. The above liquid absorbing material 322 is not only easy to obtain and low in cost, but also has good liquid absorbing performance.

[0034] Please refer to Figure 2 In some embodiments of the present application, a core package is provided inside the aluminum shell 100, and the core package includes a stacked anode layer 400 and a cathode layer 500, and an electrolytic paper layer 300 is provided between the anode layer 400 and the cathode layer 500. The electrolytic paper layer 300 includes an electrolytic paper body 310, and the side of the electrolytic paper body 310 close to the anode layer 400 is covered with a polyolefin porous membrane 320.

[0035] The core package installed inside the aluminum shell 100 is wound by the laminated anode layer 400 and cathode layer 500, and is insulated and separated by the electrolytic paper layer 300 between the anode layer 400 and the cathode layer 500. The electrolytic paper layer 300 between the anode layer 400 and the cathode layer 500 in the embodiment is arranged in a laminated structure, forming a structure in which the polyolefin porous film 320, which is a nanometer film, and the conventional electrolytic paper are stacked. Since the nanometer polyolefin material has thermoplasticity, when the capacitor receives an excessive current impact, the temperature inside the capacitor reaches the closing temperature of the nanometer polyolefin porous film 320, the micropores of the polyolefin porous film 320 will close to become a non-porous insulating layer, forming an open circuit one-side capacitor overheating failure; after the temperature inside the capacitor drops, the micropores of the polyolefin porous film 320 open, and the capacitor can continue to be used. The thermal shutdown function of the polyolefin porous film 320 is used in the embodiment, and the overheat protection of the cowhorn type aluminum electrolytic capacitor is realized.

[0036] It should be understood that the above-mentioned terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; the orientation terms "inner" and "outer" refer to the inner and outer of the contour of each component itself. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0037] For the convenience of description, spatial relative terms such as "above", "upper", "on", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned 90 degrees or in other orientations in other different ways, and the spatial relative descriptions used herein are interpreted accordingly.

[0038] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A horn-type aluminum electrolytic capacitor, characterized in that: include: an aluminum shell, wherein a pressure valve is provided on the bottom wall of the aluminum shell; a sleeve, the sleeve being sleeved on the aluminum shell; A gasket assembly is clamped between the bottom wall of the aluminum shell and the sleeve, and the pressure valve is arranged opposite to the gasket assembly. The gasket assembly includes a first flame-retardant gasket and a second flame-retardant gasket stacked together, and the first flame-retardant gasket is located on the side of the second flame-retardant gasket close to the pressure valve. The interior of the second flame-retardant gasket is filled with a liquid-absorbing material, and the liquid-absorbing material is used to absorb the electrolyte discharged from the pressure valve.

2. The horn-type aluminum electrolytic capacitor according to claim 1, characterized in that: An adhesive layer is provided between the first flame retardant gasket and the second flame retardant gasket.

3. The horn-type aluminum electrolytic capacitor according to claim 1, characterized in that: The liquid-absorbing material is liquid-absorbing powder. The second flame-retardant gasket includes a flame-retardant gasket body. The flame-retardant gasket body is formed with a filling cavity. The liquid-absorbing powder is filled into the filling cavity.

4. The horn-type aluminum electrolytic capacitor according to claim 3, characterized in that: The flame retardant gasket main body is polypropylene non-woven fabric.

5. The horn-type aluminum electrolytic capacitor according to claim 1, characterized in that: The liquid absorbing material includes sodium polyacrylate powder.

6. The horn-type aluminum electrolytic capacitor according to claim 1, characterized in that: The liquid absorbing material includes activated carbon powder.

7. The horn-type aluminum electrolytic capacitor according to claim 1, characterized in that: The first flame retardant gasket is a polypropylene gasket.

8. The horn-type aluminum electrolytic capacitor according to claim 1, characterized in that: A core package is provided inside the aluminum shell, and the core package includes a stacked anode layer and a cathode layer. An electrolytic paper layer is provided between the anode layer and the cathode layer. The electrolytic paper layer includes an electrolytic paper body, and the side of the electrolytic paper body close to the anode layer is covered with a polyolefin porous membrane.

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