Anti-leakage aluminum electrolytic capacitor and anti-leakage structure

Abstract

The utility model relates to the technical field of capacitors, in particular to an anti-leakage aluminum electrolytic capacitor and an anti-leakage structure, and the anti-leakage aluminum electrolytic capacitor comprises a capacitor core, a sleeve, a packaging shell, an anti-leakage structure and a capacitor electrode which are assembled together. Wherein an installation cavity with an opening in the top end is formed in the sleeve, the anti-leakage structure is arranged at the opening of the installation cavity and abuts against the capacitor core, the anti-leakage structure comprises an annular fixing strip exposed out of the opening of the installation cavity, and the edge of the end of the sleeve extends into the installation cavity and is fixedly connected with the fixing strip. Compared with the prior art, the aluminum electrolytic capacitor has the advantages that the anti-leakage structure arranged at the top of the sleeve is abutted against the top end of the capacitor core, and the fixing strip on the anti-leakage structure is fixedly connected with the edge of the end part of the sleeve, so that the purpose of fully improving the durability of the aluminum electrolytic capacitor can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, and in particular to a leakage-proof aluminum electrolytic capacitor and an leakage-proof structure. Background Art

[0002] Aluminum electrolytic capacitors are commonly used electronic components for power supply filtering. Many factors can affect their service life, including abnormal operating voltages (overvoltage, reverse voltage, etc.), excessively high operating temperatures, and excessively fast charge and discharge (rapid charge and discharge frequency). These conditions can all shorten the lifespan of aluminum electrolytic capacitors. However, even under normal operating conditions, the simple rubber pad packaging used in some aluminum electrolytic capacitors has poor durability and is susceptible to packaging failure over time. The resulting electrolyte leakage can easily lead to safety incidents. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a leakage-proof aluminum electrolytic capacitor and an leakage-proof structure to solve the technical problem of poor durability of aluminum electrolytic capacitors simply encapsulated with rubber pads in the prior art.

[0004] In a first aspect, the present invention provides a leakage-proof aluminum electrolytic capacitor, comprising a capacitor core, a sleeve, a packaging shell, an anti-leakage structure, and a capacitor electrode, wherein:

[0005] The sleeve is formed with a mounting cavity with an open top;

[0006] The capacitor core is arranged at the bottom of the installation cavity;

[0007] The anti-leakage structure is arranged at the opening of the installation cavity and abuts against the capacitor core. The anti-leakage structure includes an annular fixing strip exposed at the opening of the installation cavity. The end edge of the sleeve extends into the installation cavity and is fixedly connected to the fixing strip.

[0008] The packaging shell covers the sleeve and the anti-leakage structure;

[0009] One end of the capacitor electrode is connected to the capacitor core, and the other end of the capacitor electrode passes through the anti-leakage structure and the packaging shell in sequence.

[0010] According to some embodiments of the present invention, the anti-leakage structure includes:

[0011] A rubber substrate is located at the bottom of the anti-leakage structure and abuts against the capacitor core;

[0012] a lower sealing cover connected to a side of the rubber substrate away from the capacitor core;

[0013] The upper sealing cover is connected to a side of the lower sealing cover away from the rubber substrate, and the fixing strip is arranged on a side of the upper sealing cover away from the lower sealing cover.

[0014] According to some embodiments of the present invention, the cross-sectional diameter of the rubber substrate is smaller than the cross-sectional diameter of the lower sealing cover and / or the upper sealing cover, and the portion of the sleeve corresponding to the rubber substrate is concave to form a bayonet.

[0015] According to some embodiments of the present invention, the circumferential side walls of the lower sealing cover and / or the upper sealing cover support the inner side walls of the installation cavity.

[0016] According to some embodiments of the present invention, a side of the lower sealing cover close to the upper sealing cover is provided with an annular groove or a snap ring, and a side of the upper sealing cover close to the lower sealing cover is correspondingly provided with an annular snap ring or a groove.

[0017] According to some embodiments of the present invention, a gap is preset between the lower sealing cover and the upper sealing cover.

[0018] According to some embodiments of the present invention, the edge of the sleeve is connected to the fixing strip by welding or stamping.

[0019] According to some embodiments of the present invention, the fixing strip is a welding strip, and is embedded and connected to the top end of the anti-leakage structure.

[0020] According to some embodiments of the present invention, the capacitor core includes a core package and a sealing tape for fastening the core package, and the core package is electrically connected to the capacitor pole.

[0021] In a second aspect, the utility model also proposes an anti-leakage structure suitable for an aluminum electrolytic capacitor, which includes a sleeve, and the sleeve is formed with an installation cavity with an open top, wherein the anti-leakage structure is arranged at the opening of the installation cavity, and the anti-leakage structure includes an annular fixing strip exposed at the opening of the installation cavity, and the end edge of the sleeve extends into the installation cavity and is fixedly connected to the fixing strip.

[0022] According to an embodiment of the present invention, a leakage-proof aluminum electrolytic capacitor and an leakage-proof structure have at least the following beneficial effects:

[0023] According to the solution of the utility model, the anti-leakage structure provided on the top of the sleeve abuts the top of the capacitor core to form a primary seal for the capacitor core. Simultaneously, the fixing strip on the anti-leakage structure is fixedly connected to the end edge of the sleeve, thereby forming a secondary seal for the capacitor core below. Thus, the two-stage seal not only improves the reliability of preventing electrolyte leakage, but also enhances the package strength through the fixed connection between the fixing strip and the edge of the sleeve, thereby fully improving the durability of the aluminum electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic cross-sectional view of a leakage-proof aluminum electrolytic capacitor provided by the present invention;

[0025] Figure 2 A schematic diagram of a split structure of the anti-leakage structure provided by the utility model;

[0026] Figure 3 A schematic diagram of an assembly structure of the fixing strip and the upper sealing cover provided by the present invention;

[0027] Figure 4 for Figure 1 A local enlarged schematic diagram of point A;

[0028] Figure 5 A schematic diagram of the disassembled structure of the capacitor core provided by the utility model;

[0029] In the picture:

[0030] 10. Capacitor core; 20. Casing; 30. Package shell;

[0031] 40. Anti-leakage structure; 50. Capacitor pole; 101. Core package;

[0032] 102, sealing tape; 401, rubber lining; 402, lower sealing cover;

[0033] 403, upper sealing cover; 404, fixing bar; 501, cathode electrode;

[0034] 502, anode electrode; 1010, separator paper; 1011, cathode patch;

[0035] 1012. Anode patch; 1013. Cathode foil; 1014. Anode foil;

[0036] 4021, groove; 4031, snap ring. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] Based on the above background technology, it can be seen that some current aluminum electrolytic capacitors only use a rubber cover to seal the top of the capacitor, resulting in poor durability of the capacitor packaging. Therefore, the present invention proposes a leak-proof aluminum electrolytic capacitor to fully improve the overall durability of the aluminum electrolytic capacitor.

[0042] Please also refer to Figure 1 and, Figure 3 and Figure 4 The leakage-proof aluminum electrolytic capacitor proposed in the embodiment of the present application includes a capacitor core 10, a sleeve 20, a packaging shell 30, an anti-leakage structure 40, and a capacitor pole 50. Among them, the sleeve 20 is formed with a mounting cavity with an open top; the capacitor core 10 is arranged at the bottom of the mounting cavity; the anti-leakage structure 40 is arranged at the opening of the mounting cavity and abuts the capacitor core 10. The anti-leakage structure 40 includes an annular fixing bar 404 exposed at the opening of the mounting cavity, and the end edge of the sleeve 20 extends into the mounting cavity and is fixedly connected to the fixing bar 404; the packaging shell 30 covers the sleeve 20 and the anti-leakage structure 40; one end of the capacitor pole 50 is connected to the capacitor core 10, and the other end of the capacitor pole 50 passes through the anti-leakage structure 40 and the packaging shell 30 in sequence.

[0043] According to the leakage-proof aluminum electrolytic capacitor of the embodiment of the present invention, the capacitor core 10 is press-fitted into the sleeve 20 through the leakage-proof structure 40, and the leakage-proof structure 40 is used to form a first seal of the lower closure; on this basis, the end edge of the sleeve 20 (i.e., the opening edge of the installation cavity) is bent and extended and fixedly connected to the fixing strip 404 at the top of the leakage-proof structure 40, thereby forming a second seal of the upper closure (which can be combined with Figure 1 and Figure 3 Obviously, the multiple seals distributed up and down in this structural form can fully improve the fault tolerance effect of preventing electrolyte leakage, and fully cooperate with the fixed connection between the sleeve 20 and the fixing bar 404 to improve the durability of the entire aluminum electrolytic capacitor.

[0044] It is understood that the circumferential sidewall of the anti-leakage structure 40 must have at least one complete annular contact portion with the inner sidewall of the mounting cavity, thereby forming a bottom-enclosed seal. Furthermore, if multiple annular contact portions (distributed vertically) are formed between the circumferential sidewall of the anti-leakage structure 40 and the inner sidewall of the mounting cavity, the number of annular seals can be further increased, thereby further improving the durability of the entire aluminum electrolytic capacitor.

[0045] Please refer to Figure 1 and Figure 2 In some embodiments of the present invention, the anti-leakage structure 40 further includes:

[0046] The rubber substrate 401 is located at the bottom of the anti-leakage structure 40 and abuts against the capacitor core 10;

[0047] The lower sealing cover 402 is connected to the side of the rubber substrate 401 away from the capacitor core 10;

[0048] The upper sealing cover 403 is connected to a side of the lower sealing cover 402 away from the rubber substrate 401 , and the fixing bar 404 is provided on a side of the upper sealing cover 403 away from the lower sealing cover 402 .

[0049] Therefore, the anti-leakage structure 40 proposed in the present invention can further increase the number of annular seals based on the existing rubber cover packaging form by utilizing the combination of the lower sealing cover 402 and the upper sealing cover 403, and cooperating with the fixed connection between the sleeve 20 and the fixing bar 404, thereby further improving the durability of the entire aluminum electrolytic capacitor.

[0050] It can be understood that the assembled (or modular) sealing installation structure composed of the lower sealing cover 402 and the upper sealing cover 403 adopted here not only makes it easy to disassemble and assemble, but also provides convenience for the disassembly and assembly of the fixing strip 404 and its connection with the sleeve 20 (for example, the lower sealing cover 402 is first pressed into the sleeve 20, and then the relative fixed height between the upper sealing cover 403 and the lower sealing cover 402 is adjusted, so that the fixing strip 404 on the upper sealing cover 403 can be conveniently connected or fixed to the extended edge of the sleeve 20).

[0051] On this basis, the rubber substrate 401 and the lower sealing cover 402 can be fixed by gluing or clamping, and the upper sealing cover 403 and the lower sealing cover 402 can also be fixed by gluing, clamping or threading.

[0052] In some embodiments of the present invention, the cross-sectional diameter of the rubber substrate 401 is smaller than the cross-sectional diameter of the lower sealing cover 402 and / or the upper sealing cover 403, and the portion of the sleeve 20 corresponding to the rubber substrate 401 is concave to form a bayonet (such as Figure 1 and Figure 4 shown).

[0053] As a result, the concave inner sidewall of the sleeve 20's mounting cavity fully abuts the outer peripheral wall of the rubber substrate 401, effectively positioning the rubber substrate 401 while also effectively sealing the capacitor core 10 located below the concave portion. Furthermore, both the upper sealing cover 403 and the lower sealing cover 402 are located above the concave portion, with the lower sealing cover 402 preferably abutting the transitional sidewall of the concave portion, further enhancing the seal between the entire anti-leakage structure 40 and the sleeve 20.

[0054] In some embodiments of the present invention, the circumferential sidewalls of the lower sealing cover 402 and / or the upper sealing cover 403 abut the inner sidewalls of the mounting cavity. It is understood that while the circumferential sidewalls of the lower sealing cover 402 do not abut the inner sidewalls of the mounting cavity, the circumferential sidewalls of the upper sealing cover 403 must abut the inner sidewalls of the mounting cavity. In this case, an annular buffer chamber can be formed between the rubber substrate 401 and the upper sealing cover 403 to accommodate electrolyte leakage from the rubber substrate 401, thereby reducing the risk of electrolyte leakage to the outside.

[0055] Similarly, if the circumferential side wall of the upper sealing cover 403 does not abut against the inner side wall of the installation cavity, the circumferential side wall of the lower sealing cover 402 must abut against the inner side wall of the installation cavity; or the circumferential side wall of the lower sealing cover 402 abuts against the circumferential side wall of the upper sealing cover 403 (such as Figure 1 、 Figure 4At this point, the extended edge of the sleeve 20 is fixedly connected to the fixing strip 404, and can also cooperate to form a nearly annular buffer cavity between the upper sealing cover 403 and the inner wall of the installation cavity, which can also accommodate electrolyte leakage from the rubber substrate 401, thereby reducing the risk of electrolyte leakage to the outside.

[0056] Please see further Figure 2 In some embodiments of the present invention, an annular groove 4021 or a snap ring 4031 is provided on one side of the lower sealing cover 402 close to the upper sealing cover 403, and an annular snap ring 4031 or a groove 4021 is correspondingly provided on one side of the upper sealing cover 403 close to the lower sealing cover 402. Thus, the lower sealing cover 402 and the upper sealing cover 403 can be assembled and disassembled by splicing (or embedding) the groove 4021 and the snap ring 4031.

[0057] In a further embodiment of the present invention, a gap is preset between the lower sealing cover 402 and the upper sealing cover 403. Figure 2 It is understood that if a heightening pad is added to the bottom of the retaining ring 4031 or a heightening pad is set inside the retaining ring 4031, the preset gap can be achieved; if the thickness of the heightening pad is adjusted, or an elastic or flexible heightening pad is used, the gap height adjustment during fixation can also be achieved.

[0058] It is understandable that further disposing a material for absorbing electrolyte (such as electrolytic paper for soaking in electrolyte) in the above-mentioned gap can further prevent the electrolyte from leaking out of the capacitor, thereby achieving the purpose of improving the reliability of the entire aluminum electrolytic capacitor.

[0059] In some embodiments of the present invention, the edge of the sleeve 20 is welded or stamped to the fixing strip 404 to fully ensure that the fixed connection between the extended edge of the sleeve 20 and the fixing strip 404 does not leave any gaps, thereby avoiding leakage.

[0060] In some embodiments of the present invention, the aforementioned fixing strip 404 is a welding strip, and is embedded and connected to the top end of the anti-leakage structure 40 so as to be fully combined and fixed with the extended edge of the sleeve 20 .

[0061] Understandably, if Figure 2 、 Figure 3 As shown, the fixing strip 404 preferably protrudes from the top surface of the anti-leakage structure 40 (i.e., the upper end surface of the upper sealing cover 403), thereby facilitating the fixing strip 404 to be fixed on the surface and the extended edge of the sleeve 20 to be fixedly connected thereto.

[0062] Please also refer to Figure 1 and Figure 5In some embodiments of the present invention, the capacitor core 10 includes a core package 101 and a sealing tape 102 for fastening the core package 101 , and the core package 101 is electrically connected to the capacitor electrode 50 .

[0063] Specifically, the core package 101 includes a cathode foil 1013 and an anode foil 1014 wound together, and the cathode foil 1013 and the anode foil 1014 are synchronously wound and separated by a separator 1010, and then the cathode patch 1011 is attached to the cathode foil 1013 and the anode patch 1012 is attached to the anode foil 1014 to form the winding structure of the core package 101. Correspondingly, as Figure 1 As shown, the capacitor electrode 50 also includes a cathode electrode 501 connected to the cathode patch 1011, and an anode electrode 502 connected to the anode patch 1012. Thus, the electrical connection between the capacitor core 10 and the capacitor electrode 50 can be achieved.

[0064] In a further embodiment of the present invention, the sealing tape 102 is provided by adhesive tape to achieve overall winding and fixation of the core package 101 .

[0065] In a further embodiment of the present invention, the length of the anode electrode 502 is longer than that of the cathode electrode 501 , so as to facilitate separate assembly between the anode electrode 502 and the cathode electrode 501 .

[0066] Please refer again Figure 1 、 Figure 2 and Figure 3 In some embodiments of the present invention, the rubber substrate 401 , the lower sealing cover 402 , the upper sealing cover 403 and the packaging shell 30 are all provided with mounting holes adapted to the anode electrode 502 and the cathode electrode 501 .

[0067] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A leak-proof aluminum electrolytic capacitor, comprising a capacitor core, a casing, a packaging shell, an anti-leakage structure, and a capacitor electrode, characterized in that: The sleeve is formed with a mounting cavity with an open top; The capacitor core is arranged at the bottom of the installation cavity; The anti-leakage structure is arranged at the opening of the installation cavity and abuts against the capacitor core. The anti-leakage structure includes an annular fixing strip exposed at the opening of the installation cavity. The end edge of the sleeve extends into the installation cavity and is fixedly connected to the fixing strip. The packaging shell covers the sleeve and the anti-leakage structure; One end of the capacitor electrode is connected to the capacitor core, and the other end of the capacitor electrode passes through the anti-leakage structure and the packaging shell in sequence.

2. The anti-leakage aluminum electrolytic capacitor according to claim 1, characterized in that: The anti-leakage structure comprises: A rubber substrate is located at the bottom of the anti-leakage structure and abuts against the capacitor core; a lower sealing cover connected to a side of the rubber substrate away from the capacitor core; The upper sealing cover is connected to a side of the lower sealing cover away from the rubber substrate, and the fixing strip is arranged on a side of the upper sealing cover away from the lower sealing cover.

3. The anti-leakage aluminum electrolytic capacitor according to claim 2, characterized in that: The cross-sectional diameter of the rubber substrate is smaller than the cross-sectional diameter of the lower sealing cover and / or the upper sealing cover, and the portion of the sleeve corresponding to the rubber substrate is concave to form a bayonet.

4. The anti-leakage aluminum electrolytic capacitor according to claim 3, characterized in that: The circumferential side walls of the lower sealing cover and / or the upper sealing cover support the inner side walls of the installation cavity.

5. The anti-leakage aluminum electrolytic capacitor according to any one of claims 2 to 4, characterized in that: The side of the lower sealing cover close to the upper sealing cover is provided with an annular groove or a snap ring, and the side of the upper sealing cover close to the lower sealing cover is correspondingly provided with an annular snap ring or a groove.

6. The anti-leakage aluminum electrolytic capacitor according to claim 5, characterized in that: A gap is preset between the lower sealing cover and the upper sealing cover.

7. The anti-leakage aluminum electrolytic capacitor according to any one of claims 1 to 4, characterized in that: The edge of the sleeve is connected to the fixing strip by welding or stamping.

8. The anti-leakage aluminum electrolytic capacitor according to claim 7, characterized in that: The fixing strip is a welding strip and is embedded and connected to the top end of the anti-leakage structure.

9. The anti-leakage aluminum electrolytic capacitor according to any one of claims 1 to 4, characterized in that: The capacitor core includes a core package and a sealing tape for fastening the core package, and the core package is electrically connected to the capacitor pole.

10. A leakage-proof structure, suitable for an aluminum electrolytic capacitor, comprising a sleeve having a mounting cavity with an open top, characterized in that: The anti-leakage structure is arranged at the opening of the installation cavity, and the anti-leakage structure includes an annular fixing strip exposed at the opening of the installation cavity, and the end edge of the sleeve extends into the installation cavity and is fixedly connected to the fixing strip.

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