Aluminum electrolytic capacitor

Abstract

The utility model discloses an aluminum electrolytic capacitor, which comprises an aluminum shell, a core bag arranged in the aluminum shell, and a cover plate used for packaging the core bag in the aluminum shell, wherein an isolating layer is arranged at the position, close to the bottom, of the aluminum shell, and the space of the aluminum shell is divided into a flame-retardant space and a core package accommodating space through the isolating layer; the core cladding is placed in the core cladding accommodating space, and an explosion-proof flame-retardant block is arranged in the flame-retardant space. The aluminum electrolytic capacitor provided by the utility model has good explosion-proof and flame-retardant effects, can effectively prevent fire disasters caused by explosion of the capacitor core cladding, and improves the safety performance of the electrolytic capacitor.

Description

Technical Field

[0001] This utility model belongs to the field of electronic device technology, and in particular relates to an aluminum electrolytic capacitor. Background Technology

[0002] Among various capacitors, aluminum electrolytic capacitors are widely popular because, for the same size, they can achieve a larger CV value per unit area, store more charge, and are cheaper.

[0003] Aluminum electrolytic capacitors are generally equipped with explosion-proof structures, such as explosion-proof valves or explosion-proof holes. Typically, most explosion-proof devices for aluminum electrolytic capacitors are located on the aluminum shell, such as explosion-proof holes or explosion-proof valves designed on the bottom or side. The main purpose is to prevent the capacitor from exploding if a performance abnormality occurs during use, causing the capacitor to heat up and the electrolyte inside the capacitor to vaporize, producing a large amount of gas inside the shell. When the gas pressure exceeds the pressure release value of the explosion-proof valve, the explosion-proof valve opens, releasing the electrolyte and gas, thus preventing the capacitor from exploding.

[0004] Although most aluminum electrolytic capacitors are designed with explosion-proof structures, capacitor explosions can still occur. Because the electrolyte in aluminum electrolytic capacitors is primarily composed of ethylene glycol and polymer materials, which are flammable, and this electrolyte adheres to the electrolytic paper, which is also flammable, the capacitor core can easily ignite under the sparks during an explosion. Once a capacitor catches fire, it can damage the entire device using the capacitor, or even cause a serious fire, endangering the user's property and life. Therefore, explosion-proof design for aluminum electrolytic capacitors is extremely important.

[0005] The above background information is provided only to aid in understanding the inventive concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0006] The purpose of this invention is to provide an aluminum electrolytic capacitor to solve at least one of the problems mentioned above in the background section.

[0007] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:

[0008] An aluminum electrolytic capacitor includes an aluminum shell, a core package installed inside the aluminum shell, and a cover plate for encapsulating the core package inside the aluminum shell; wherein, an isolation layer is provided near the bottom of the aluminum shell, and the isolation layer divides the space of the aluminum shell into a flame-retardant space and a core package receiving space; the core package is placed in the core package receiving space, and an explosion-proof flame-retardant block is provided in the flame-retardant space.

[0009] In some embodiments, the core package includes a plurality of electrolytic paper layers, an aluminum foil layer, and lead-out pins disposed on the aluminum foil layer, the lead-out pins extending outward through a cover plate.

[0010] In some embodiments, the explosion-proof flame-retardant block is a high-porosity flame-retardant sponge block or a high-porosity flame-retardant sheet.

[0011] In some embodiments, the explosion-proof flame-retardant block is provided with a plurality of vent holes, the direction of which is perpendicular to the radial direction of the explosion-proof flame-retardant block.

[0012] In some embodiments, the plurality of vent holes are arranged around the center of the explosion-proof and flame-retardant block, wherein the vent hole density of the central portion is greater than that of the edge portion.

[0013] In some embodiments, the insulating layer is a circular sheet, and the inner diameter of the flame-retardant space is less than or equal to the inner diameter of the core package receiving space.

[0014] In some embodiments, the outer wall thickness of the aluminum shell is non-uniform, wherein the aluminum shell thickness of the flame-retardant space portion is greater than the aluminum shell thickness of the core package receiving space portion.

[0015] In some embodiments, the tail end of the aluminum shell is fitted with a metal explosion-proof fixing device, which includes a first explosion-proof space and a second explosion-proof space with unequal inner diameters.

[0016] In some embodiments, the second explosion-proof space is larger than the first explosion-proof space, and a gap is provided between the second explosion-proof space and the outer wall of the aluminum shell.

[0017] In some embodiments, the second explosion-proof space of the metal explosion-proof fixing device has a fixing pin; there are two fixing pins, and the two fixing pins are respectively arranged on both sides of the second explosion-proof space.

[0018] In some embodiments, the above is stated.

[0019] The beneficial effects of this utility model's technical solution are:

[0020] Compared with existing technologies, the aluminum electrolytic capacitor of this invention has excellent explosion-proof and flame-retardant effects, which can effectively prevent the capacitor core from bursting and causing a fire, thus improving the safety performance of the electrolytic capacitor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0023] Figure 2 This is a three-dimensional schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention from another angle;

[0024] Figure 3 This is a schematic diagram of the interior of an aluminum electrolytic capacitor after being cut open according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of an explosion-proof and flame-retardant block for an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of an explosion-proof and flame-retardant block for an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0027] Figure 6 This is a partially exploded schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0028] Figure 7 This is a cross-sectional schematic diagram of the aluminum shell of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0029] Figure 8 This is a partially enlarged cross-sectional view of the aluminum shell of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0030] Figure 9 This is a three-dimensional schematic diagram of an aluminum electrolytic capacitor according to another embodiment of the present invention;

[0031] Figure 10 yes Figure 9 A cross-sectional internal view of an aluminum electrolytic capacitor as shown in the example.

[0032] Figure 11 yes Figure 9 A three-dimensional schematic diagram of the metal explosion-proof fixing device for an aluminum electrolytic capacitor. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer and more understandable, and to enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0034] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0035] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, "multiple" means two or more. Terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Reference Figures 1-5 , Figure 7 , Figure 8As shown in the figure, as an embodiment of the present invention, an aluminum electrolytic capacitor 100 is provided, including an aluminum shell 10, a core package 20 installed in the aluminum shell 10, and a cover plate 30 for encapsulating the core package 20 in the aluminum shell 10; wherein, an isolation layer 101 is provided near the bottom of the aluminum shell, and the isolation layer 101 divides the space of the aluminum shell into a flame-retardant space 102 and a core package receiving space 103; an explosion-proof valve 1010 is provided on the isolation layer 101, and the core package 20 is placed in the core package receiving space; the core package 20 includes a plurality of electrolytic paper layers, an aluminum foil layer, and lead-out pins 201 provided on the aluminum foil layer, and the lead-out pins 201 extend outward through the cover plate 30.

[0038] Reference Figures 2-5 As shown, in some embodiments, an explosion-proof flame-retardant block 40 is disposed within the flame-retardant space 102 of the aluminum shell 10, and the explosion-proof flame-retardant block 40 is provided with a plurality of vent holes 401. In some embodiments, the explosion-proof flame-retardant block 40 is circular, and the direction of the plurality of vent holes 401 is perpendicular to the radial direction of the circular explosion-proof flame-retardant block. In some embodiments, the vent holes 401 are disposed around the center of the explosion-proof flame-retardant block, wherein the vent hole density of the central portion is greater than the vent hole density of the edge portion. (Refer to...) Figure 4 , Figure 5 As shown, in some embodiments, the vent 401 is cross-shaped. This cross-shaped design increases the gas flow rate through the air passage while preventing the passage of large liquid or solid particles. In some embodiments, the explosion-proof flame-retardant block 40 is a high-porosity flame-retardant sponge block or a high-porosity flame-retardant sheet. In some embodiments, the material of the explosion-proof flame-retardant block 40 is one or a combination of foamed cement, foamed metal sponge, foamed polymer sponge, and multi-layer genuine leather. In some embodiments, the inner diameter of the flame-retardant space 102 is equal to the outer diameter of the explosion-proof flame-retardant block 40, and the outer wall of the explosion-proof flame-retardant block 40 is in complete contact with the inner wall of the flame-retardant space 102.

[0039] Reference Figure 1 , Figure 3 , Figure 6 As shown, in some embodiments, the cover plate 30 has a circular hole 301, and the lead-out pin 201 extending from the core package 20 passes through the circular hole 301 on the cover plate 30 and extends outward. In some embodiments, the cover plate 30 is a rubber stopper; after the core package 20 is placed in the core package receiving space 103, the opening of the aluminum shell 10 is sealed by the rubber stopper, and the opening of the aluminum shell is rolled to fix the rubber stopper. In some embodiments, the surface of the rubber stopper is provided with protrusions 302. This design can increase the redundancy of the rubber stopper and enhance the sealing effect of the cover plate.

[0040] Reference Figure 7 , Figure 8 , Figure 10 As shown, the insulating layer 101 is a circular sheet, and the inner diameter of the flame-retardant space 102 is less than or equal to the inner diameter of the core package receiving space 103. In some embodiments, the outer wall thickness of the aluminum shell 10 is greater than the thickness of the insulating layer 101. In some embodiments, the outer wall thickness of the aluminum shell 10 is non-uniform, wherein the aluminum shell thickness of the flame-retardant space portion is greater than the aluminum shell thickness of the core package receiving space portion; this design improves the flame-retardant and explosion-proof performance of the flame-retardant space portion.

[0041] Reference Figure 1 , Figure 3 , Figure 6 As shown, in some embodiments, the cover plate 30 is circular, and the diameter of the explosion-proof flame-retardant block 40 is smaller than the diameter of the cover plate 30. In some embodiments, the thickness of the explosion-proof flame-retardant block 40 is smaller than the thickness of the cover plate 30. After the explosion-proof flame-retardant block 40 is placed in the flame-retardant space 102, the opening of the flame-retardant space 102 is rolled up to tightly fasten the explosion-proof flame-retardant block 40, thereby fixing the flame-retardant block 40.

[0042] In some embodiments, the core package 20 includes a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer, and a cathode aluminum foil layer arranged sequentially from the inside out; a positive electrode lead-out pin is riveted to the anode aluminum foil layer, and a negative electrode lead-out pin is riveted to the cathode aluminum foil layer; wherein, a sandwich paper film is provided at the position where the positive electrode lead-out pin is riveted to the anode aluminum foil layer and / or at the position where the negative electrode lead-out pin is riveted to the cathode aluminum foil layer; the first electrolytic paper layer, the anode aluminum foil layer with the riveted positive electrode lead-out pin, the second electrolytic paper layer, and the cathode aluminum foil layer with the riveted negative electrode lead-out pin are wound together to form the core package. In some embodiments, the core package has a through hole along its central axis.

[0043] In some embodiments, the thickness of the electrolytic paper layer is 40µm-70µm, and the electrolytic paper is a double-layer composite paper with a rotary screen or a double-layer composite paper with a rotary screen and a special screen. In some embodiments, the fiber structure of the electrolytic paper is circular.

[0044] Reference Figures 9-11 As shown in one embodiment of this utility model, a metal explosion-proof fixing device 50 is provided at the end of the aluminum electrolytic capacitor opposite to the cover plate 30. The metal explosion-proof fixing device 50 includes a first explosion-proof space and a second explosion-proof space with unequal inner diameters, and a fixing pin 501 extending from the second explosion-proof space. The metal explosion-proof fixing device 50 is sleeved on the tail of the aluminum shell 10, wherein the inner diameter of the first explosion-proof space is equal to the outer diameter of the flame-retardant space 102, so that the tail of the aluminum shell is in complete contact with the first explosion-proof space.

[0045] Reference Figure 10 As shown, the second explosion-proof space is larger than the first explosion-proof space, and a gap is provided between the second explosion-proof space and the outer wall of the aluminum shell. (Refer to...) Figure 10 As shown, there are two fixed pins 501, which are respectively located on both sides of the second explosion-proof space. In some embodiments, the fixed pins 501 are in the shape of straight plates, flush with the opening of the second explosion-proof space and tangent to the inner circle of the second explosion-proof space. With this arrangement, the electrolytic capacitor can be stably mounted and fixed on the circuit board during installation.

[0046] It is understood that the above description is a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the inventive concept, and all such substitutions or modifications should be considered within the scope of protection of this patent. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention.

[0047] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of different embodiments or examples, without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope defined by the appended claims.

[0048] Furthermore, the scope of this invention is not intended to be limited to the specific embodiments of the processes, machines, manufactures, material compositions, means, methods, and steps described in the specification. Those skilled in the art will readily understand that existing or later-developed disclosures, processes, machines, manufactures, material compositions, means, methods, or steps that perform substantially the same function as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein can be utilized. Therefore, the appended claims are intended to include such processes, machines, manufactures, material compositions, means, methods, or steps within their scope.

Claims

1. An aluminum electrolytic capacitor characterized by: The application relates to an aluminum shell, a core package installed in the aluminum shell, and a cover plate used for packaging the core package in the aluminum shell; wherein the aluminum shell is provided with an isolation layer at a position close to the bottom, the space of the aluminum shell is divided into a flame-retardant space and a core package containing space through the isolation layer; the core package is placed in the core package containing space, and an explosion-proof flame-retardant block is arranged in the flame-retardant space.

2. The aluminum electrolytic capacitor as claimed in claim 1, wherein: The core package comprises a plurality of electrolytic paper layers, an aluminum foil layer, and a lead-out needle arranged on the aluminum foil layer, and the lead-out needle extends outward through the cover plate.

3. The aluminum electrolytic capacitor as claimed in claim 1, wherein: The explosion-proof flame-retardant block is a high-porosity flame-retardant sponge block or a high-porosity flame-retardant sheet.

4. The aluminum electrolytic capacitor as claimed in claim 1, wherein: The explosion-proof flame-retardant block is provided with a plurality of air permeation holes, and the directions of the air permeation holes are perpendicular to the radial direction of the explosion-proof flame-retardant block.

5. The aluminum electrolytic capacitor as claimed in claim 4, wherein: The plurality of air permeation holes are arranged around the central position of the explosion-proof flame-retardant block, wherein the air permeation hole density of the central part is greater than that of the edge part.

6. The aluminum electrolytic capacitor as claimed in claim 1, wherein: The isolation layer is a circular sheet, and the inner diameter of the flame-retardant space is less than or equal to the inner diameter of the core package containing space.

7. The aluminum electrolytic capacitor as claimed in claim 1, wherein: The shell wall thickness of the aluminum shell is unevenly arranged, wherein the aluminum shell thickness of the flame-retardant space part is greater than that of the core package containing space part.

8. The aluminum electrolytic capacitor as claimed in claim 1, wherein: The tail part of the aluminum shell is sleeved with a metal explosion-proof fixing device, and the metal explosion-proof fixing device comprises a first explosion-proof space and a second explosion-proof space with different inner diameters.

9. The aluminum electrolytic capacitor as claimed in claim 8, wherein: The second explosion-proof space is greater than the first explosion-proof space, and a gap is arranged between the second explosion-proof space and the outer wall of the aluminum shell.

10. The aluminum electrolytic capacitor as claimed in claim 9, wherein: The second explosion-proof space of the metal explosion-proof fixing device is provided with fixing pins; the fixing pins are two in total, and the two fixing pins are arranged on the two sides of the second explosion-proof space respectively.

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