Sealing rubber plug of aluminum electrolytic capacitor

Abstract

The utility model discloses a sealing rubber plug of an aluminum electrolytic capacitor, which comprises a rubber plug body, an anode riveting part, a cathode riveting part, an anode welding terminal and a cathode welding terminal, the anode riveting part, the cathode riveting part, the anode welding terminal and the cathode welding terminal are fixed on the rubber plug body, and the anode riveting part and the cathode riveting part are led out from one surface of the rubber plug body towards the inside of the aluminum electrolytic capacitor. The anode welding terminal and the cathode welding terminal are led out from one surface, facing the outside of the aluminum electrolytic capacitor, of the rubber plug body, the anode welding terminal is connected with the anode riveting part in a conducting manner, and the cathode welding terminal is connected with the cathode riveting part in a conducting manner. On one hand, the air tightness of the sealing rubber plug is greatly improved, and on the other hand, the common problems that the lead is broken, the vibration frequency is transmitted into the capacitor through the lead to damage an internal core and the like due to low anti-seismic performance of the sealing rubber plug structure are reduced. According to the sealing rubber plug of the aluminum electrolytic capacitor provided by the utility model, the guide pin function is integrated in the rubber plug, the structure is simpler, and the assembly is easier.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum electrolytic capacitors, in particular to a sealing rubber plug of aluminum electrolytic capacitors. Background Art

[0002] Wound-type solid-state aluminum electrolytic capacitors are widely used in consumer electronics due to their high stability and reliability, low equivalent series resistance (ESR), good high-frequency characteristics, strong ripple current resistance, and small size. Their core component is the capacitor core, which is made of anode foil, electrolytic paper, cathode foil, anode guide pins, and cathode guide pins wound together, impregnated with electrolyte, and then encased in an aluminum shell and sealed with a rubber plug. The sealing plug has two lead holes running through the middle of the plug, which extend from the front to the back. When assembling the product, the anode and cathode guide pins need to be passed through these two holes, which poses a risk of poor airtightness. Furthermore, in a vibrating environment, external vibration frequencies can be transmitted through the leads into the capacitor, reducing its vibration resistance.

[0003] Chinese utility model patent 201920198374.7 discloses a surface-mounted aluminum electrolytic capacitor, comprising an aluminum shell and a core package located within the aluminum shell, the core package being connected to positive and negative electrode leads. The surface-mounted aluminum electrolytic capacitor's sealing plug is a boss sealing plug, the boss sealing plug having a cylindrical boss with a concave top, a hollow groove in the middle of the cylindrical boss perpendicular to the boss sealing plug, the hollow groove having positive and negative electrode lead holes, the positive and negative electrode leads extending through the positive and negative electrode lead holes, and the boss sealing plug being assembled and sealed at the opening of the aluminum shell. Although the sealing plug of this aluminum electrolytic capacitor avoids the problem of easily broken leads, the presence of positive and negative electrode lead holes in the sealing plug results in poor airtightness and seismic resistance of the electrolytic capacitor, and the electrolyte easily evaporates and dries up, causing the capacitor to fail.

[0004] Therefore, there is an urgent need to develop a sealing rubber plug with high sealing performance and anti-vibration performance. Utility Model Content

[0005] Based on this, it is necessary to provide a sealing plug for aluminum electrolytic capacitors to address the above technical problems. The sealing plug is provided with male and female lead terminals. When the sealing plug is used, the male and female lead terminals are directly connected to the external circuit board, and the airtightness and seismic resistance are better.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A sealing rubber plug for an aluminum electrolytic capacitor comprises: a rubber plug body, and an anode rivet portion, a cathode rivet portion, an anode welding terminal, and a cathode welding terminal fixed to the rubber plug body, wherein the anode rivet portion and the cathode rivet portion are led out from a side of the rubber plug body toward the interior of the aluminum electrolytic capacitor, and the anode welding terminal and the cathode welding terminal are led out from a side of the rubber plug body toward the exterior of the aluminum electrolytic capacitor, the anode welding terminal is conductively connected to the anode rivet portion, and the cathode welding terminal is conductively connected to the cathode rivet portion.

[0008] Furthermore, the plug body comprises a plug shell and a plug core, and the inner peripheral wall of the plug shell wraps the outer peripheral wall of the plug core to form a sealing structure.

[0009] Furthermore, the anode riveted portion and the cathode riveted portion are fixed on the inner core of the rubber plug, and the anode riveted portion and the cathode riveted portion are led out from the outer shell of the rubber plug toward the inside of the aluminum electrolytic capacitor.

[0010] Furthermore, the anode welding terminal and the cathode welding terminal are respectively fixed on the inner core of the rubber plug, the anode welding terminal is conductively connected to the anode riveted part, and the cathode welding terminal is conductively connected to the cathode riveted part.

[0011] Furthermore, the anode riveted portion includes an anode riveted terminal and an anode connection gasket, the anode connection gasket is fixed on the inner core of the rubber plug, one end of the anode riveted terminal is conductively and fixedly connected to the anode connection gasket, and the other end passes through the rubber plug shell and is led out.

[0012] Furthermore, the cathode riveted part includes a cathode riveted terminal and a cathode connecting gasket, the cathode connecting gasket is fixed on the inner core of the rubber plug, one end of the cathode riveted terminal is conductively and fixedly connected to the cathode connecting gasket, and the other end passes through the rubber plug shell and is led out.

[0013] Furthermore, one end of the anode welding terminal is conductively connected to the anode connection gasket, and the other end is led out from the side of the rubber plug shell toward the outside of the aluminum electrolytic capacitor; one end of the cathode welding terminal is conductively connected to the cathode connection gasket, and the other end is led out from the side of the rubber plug shell toward the outside of the aluminum electrolytic capacitor.

[0014] Furthermore, the anode riveted terminal and the cathode riveted terminal are columnar terminals.

[0015] Furthermore, the anode welding terminal and the cathode welding terminal are sheet terminals.

[0016] Furthermore, the main material of the rubber plug shell is butyl rubber or EPDM rubber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The sealing rubber plug for aluminum electrolytic capacitors provided by the utility model directly provides male and female riveted portions and corresponding male and female soldering terminals for conductive connection on the plug body. During assembly, the male and female riveted portions are directly riveted to the positive and negative guide pins, eliminating the need for reserved positive and negative guide pin holes on the plug body. During use, the male and female soldering terminals can simply be soldered to an external circuit board. This greatly improves the airtightness of the sealing rubber plug and reduces common problems caused by the sealing rubber plug's low seismic resistance, such as lead breakage and vibration frequency transmission through the leads into the capacitor, which can damage the internal core. The sealing rubber plug for aluminum electrolytic capacitors provided by the utility model integrates the guide pin function into the plug, resulting in a simpler structure and easier assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the sealing plug of the aluminum electrolytic capacitor provided by the utility model Figure 1 ;

[0020] Figure 2 Schematic diagram of the bottom structure of the sealing plug of the aluminum electrolytic capacitor provided by the utility model Figure 1 ;

[0021] Figure 3 Schematic diagram of the internal structure of the sealing plug of the aluminum electrolytic capacitor provided by the utility model Figure 1 ;

[0022] Figure 4 Schematic diagram of the internal structure of the sealing plug of the aluminum electrolytic capacitor provided by the utility model Figure 2 ;

[0023] Figure 5 Schematic diagram of the internal structure of the sealing plug of the aluminum electrolytic capacitor provided by the utility model Figure 3 ;

[0024] Figure 6 Schematic diagram of the bottom structure of the sealing plug of the aluminum electrolytic capacitor provided by the utility model Figure 2 .

[0025] The markings in the figure are as follows:

[0026] The rubber plug body 1, the rubber plug shell 11, and the rubber plug inner core 12;

[0027] Anode riveted part 2, anode riveted terminal 21, anode connection gasket 22, first limit block 23;

[0028] Cathode riveted portion 3, cathode riveted terminal 31, cathode connecting gasket 32, second limiting block 33;

[0029] The anode is welded to the terminal 4 and the cathode is welded to the terminal 5. DETAILED DESCRIPTION

[0030] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0032] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first," "second," or "third" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] As described in the background art, the sealing rubber plugs of existing aluminum electrolytic capacitors have poor airtightness and shock resistance, which can easily lead to failure of the aluminum electrolytic capacitors.

[0034] In order to solve this technical problem, the utility model provides a sealing plug for an aluminum electrolytic capacitor, which includes a plug body 1 and an anode rivet part 2, a cathode rivet part 3, an anode welding terminal 4 and a cathode welding terminal 5 fixed on the plug body 1, the anode rivet part 2 and the cathode rivet part 3 are led out from a side of the plug body 1 toward the interior of the aluminum electrolytic capacitor, and the anode welding terminal 4 and the cathode welding terminal 5 are led out from a side of the plug body 1 toward the outside of the aluminum electrolytic capacitor, the anode welding terminal 4 is conductively connected to the anode rivet part 2, and the cathode welding terminal 5 is conductively connected to the cathode rivet part 3.

[0035] The sealing rubber plug for an aluminum electrolytic capacitor provided by the utility model integrates the anode and cathode riveting parts and the anode and cathode welding terminals into one body, thereby simplifying the overall structure of the aluminum electrolytic capacitor. No guide pin holes need to be reserved on the sealing rubber plug, thereby avoiding volatilization of electrolyte in the aluminum electrolytic capacitor caused by poor sealing of the guide pin holes during use, and enhancing the stability and seismic resistance of the aluminum electrolytic capacitor.

[0036] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] Please refer to Figures 1 to 5 The utility model provides a sealing plug for an aluminum electrolytic capacitor, which includes a core pack, an aluminum shell and a sealing plug. The core pack is placed inside a cavity formed by the aluminum shell and the sealing plug. The core pack is wound by an anode aluminum foil, electrolytic paper and a cathode aluminum foil. The anode foil and the cathode foil are riveted and have positive and negative electrode guide pins respectively.

[0040] Furthermore, the sealing plug is cylindrical and includes a plug body 1. The plug body 1 has an anode riveted part 2 and a cathode riveted part 3 extending from one side thereof toward the interior of the aluminum electrolytic capacitor. The anode riveted part 2 is riveted to the positive electrode guide pin, and the cathode riveted part 3 is riveted to the negative electrode guide pin. The guide pin hole structure in the sealing plug of a conventional aluminum electrolytic capacitor is omitted, thereby making the aluminum electrolytic capacitor more airtight.

[0041] Furthermore, the plug body 1 includes a plug shell 11 and a plug core 12. Specifically, the plug core 12 is a semi-rigid insulating support material, and the plug shell 11 is an elastic insulating material. The inner circumferential wall of the plug shell 11 wraps the outer circumferential wall of the plug core 12 to form a sealing structure. The anode riveted part 2 and the cathode riveted part 3 are fixed on the plug core 12, and the anode riveted part 2 and the cathode riveted part 3 are insulated and connected to each other. After the plug shell 11 wraps the plug core 12, the anode riveted part 2 and the cathode riveted part 3 are led out from the plug shell 11 toward the inner side of the aluminum electrolytic capacitor.

[0042] Furthermore, the material of the plug shell 11 is butyl rubber or EPDM rubber, which utilizes its good elasticity to adapt to the shape of the opening of the aluminum shell and press the opening of the aluminum shell.

[0043] Specifically, the anode riveted part 2 includes an anode riveted terminal 21 and an anode connecting gasket 22. The anode connecting gasket 22 is fixed on the rubber plug inner core 12. One end of the anode riveted terminal 21 is conductively and fixedly connected to the anode connecting gasket 22, and the other end passes through the rubber plug shell 11 and is led out and riveted to the positive electrode guide pin inside the aluminum electrolytic capacitor.

[0044] Specifically, the cathode riveted part 3 includes a cathode riveted terminal 31 and a cathode connecting gasket 32. The cathode connecting gasket 32 is fixed on the inner core 12 of the rubber plug. One end of the cathode riveted terminal 31 is conductively and fixedly connected to the cathode connecting gasket 32, and the other end passes through the rubber plug shell 11 and is led out to be riveted to the negative electrode guide pin inside the aluminum electrolytic capacitor.

[0045] Furthermore, the sealing rubber plug is also provided with an anode welding terminal 4 and a cathode welding terminal 5. Specifically, the anode welding terminal 4 and the cathode welding terminal 5 are respectively fixed on the rubber plug inner core 12. The anode welding terminal 4 is conductively connected to the anode riveted portion 2, and the cathode welding terminal 5 is conductively connected to the cathode riveted portion 3. Specifically, one end of the anode welding terminal 4 is conductively connected to the anode connection gasket 22, and the other end is led out from the rubber plug shell 11 toward the outside of the aluminum electrolytic capacitor and welded to the external circuit board. Thus, one end of the cathode welding terminal 5 is conductively connected to the cathode connection gasket 32, and the other end is led out from the rubber plug shell 11 toward the outside of the aluminum electrolytic capacitor and welded to the external circuit board. This changes the traditional method of winding aluminum electrolytic capacitors by leading the lead pins from the inside of the capacitor to the outside for welding, effectively improving the seismic performance of the capacitor.

[0046] Furthermore, the anode riveted part 2 also includes a first limit block 23, the bottom of which is fixed on the rubber plug inner core 12 and arranged around the anode riveted terminal 21 to assist in fixing the anode riveted terminal 21 and prevent the anode riveted terminal 21 from displacement.

[0047] Furthermore, the cathode riveting part 3 also includes a second limit block 33, the bottom of which is fixed on the rubber plug inner core 12 and is arranged around the cathode riveted terminal 31 to assist in fixing the cathode riveted terminal 31 and prevent the cathode riveted terminal 31 from displacement.

[0048] Furthermore, the anode riveted terminal 21 and the cathode riveted terminal 31 are columnar terminals. In this embodiment, the anode riveted terminal 21 and the cathode riveted terminal 31 are designed into different shapes to facilitate the distinction between positive and negative poles during assembly, wherein the anode riveted terminal 21 is a cylindrical terminal, and the cathode riveted terminal 31 is a square columnar terminal.

[0049] Furthermore, the anode welding terminal 4 and the cathode welding terminal 5 are sheet-shaped terminals, insulated from each other. One side of the anode welding terminal 4 is electrically connected to the anode connection gasket 22, and the other side protrudes from the rubber plug housing 11, facing the outside of the aluminum electrolytic capacitor, thereby being welded to an external circuit board. The cathode welding terminal 5 has one side electrically connected to the cathode connection gasket 32, and the other side protrudes from the rubber plug housing 11, facing the outside of the aluminum electrolytic capacitor, thereby being welded to an external circuit board. The shapes of the anode welding terminal 4 and the cathode welding terminal 5 are not limited. In this embodiment, the anode welding terminal 4 and the cathode welding terminal 5 are of the same shape, both being rectangular sheet-shaped structures, to ensure a sufficiently large welding area.

[0050] The utility model provides a sealing rubber plug for an aluminum electrolytic capacitor, such as Figure 6 As shown, the difference from Example 1 is that the anode welding terminal 4 and the cathode welding terminal 5 are different in shape, wherein the anode welding terminal 5 is a rectangular sheet structure, and the cathode welding terminal 4 is a rectangular sheet structure and the corresponding two side edges are concave to form a semicircular depression, which is convenient for distinguishing the positive and negative terminals during the welding operation and preventing welding errors.

[0051] The use process of the sealing plug of the aluminum electrolytic capacitor provided by the present invention is as follows: the positive electrode guide pin is riveted to the anode aluminum foil, the negative electrode guide pin is riveted to the cathode aluminum foil, and then the anode aluminum foil, electrolytic paper and cathode aluminum foil are wound into a core package, which is impregnated with electrolyte and placed in an aluminum shell. After sealing with a sealing plug, the core package is subjected to a waist aging process to complete the assembly, wherein the anode riveted terminal 21 of the sealing plug is connected to the positive electrode guide pin, and the cathode riveted terminal 31 is connected to the negative electrode guide pin. When in use, the anode welding terminal 4 and the cathode welding terminal 5 are welded to the external circuit board.

[0052] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0053] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the present invention patent.

Claims

1. A sealing rubber plug for an aluminum electrolytic capacitor, characterized in that: The invention comprises a rubber plug body (1), and an anode riveted portion (2), a cathode riveted portion (3), an anode welding terminal (4), and a cathode welding terminal (5) fixed on the rubber plug body (1); the anode riveted portion (2) and the cathode riveted portion (3) are led out from a side of the rubber plug body (1) facing the inside of the aluminum electrolytic capacitor; the anode welding terminal (4) and the cathode welding terminal (5) are led out from a side of the rubber plug body (1) facing the outside of the aluminum electrolytic capacitor; the anode welding terminal (4) is conductively connected to the anode riveted portion (2), and the cathode welding terminal (5) is conductively connected to the cathode riveted portion (3).

2. The sealing rubber plug for aluminum electrolytic capacitor according to claim 1, characterized in that: The plug body (1) comprises a plug shell (11) and a plug core (12), wherein the inner peripheral wall of the plug shell (11) wraps the outer peripheral wall of the plug core (12) to form a sealing structure.

3. The sealing rubber plug for aluminum electrolytic capacitor according to claim 2, characterized in that: The anode riveted portion (2) and the cathode riveted portion (3) are fixed on the rubber plug inner core (12), and the anode riveted portion (2) and the cathode riveted portion (3) are led out from the rubber plug outer shell (11) toward the interior of the aluminum electrolytic capacitor.

4. The sealing rubber plug for aluminum electrolytic capacitor according to claim 2, characterized in that: The anode welding terminal (4) and the cathode welding terminal (5) are respectively fixed on the rubber plug inner core (12); the anode welding terminal (4) is conductively connected to the anode riveted portion (2); and the cathode welding terminal (5) is conductively connected to the cathode riveted portion (3).

5. The sealing rubber plug for aluminum electrolytic capacitor according to claim 3, characterized in that: The anode riveted portion (2) comprises an anode riveted terminal (21) and an anode connection gasket (22); the anode connection gasket (22) is fixed to the rubber plug inner core (12); one end of the anode riveted terminal (21) is conductively and fixedly connected to the anode connection gasket (22), and the other end passes through the rubber plug outer shell (11) and is led out.

6. The sealing rubber plug for aluminum electrolytic capacitor according to claim 5, characterized in that: The cathode riveting portion (3) comprises a cathode riveting terminal (31) and a cathode connecting gasket (32); the cathode connecting gasket (32) is fixed to the rubber plug inner core (12); one end of the cathode riveting terminal (31) is conductively and fixedly connected to the cathode connecting gasket (32), and the other end passes through the rubber plug outer shell (11) and is led out.

7. The sealing rubber plug for aluminum electrolytic capacitor according to claim 5, characterized in that: One end of the anode welding terminal (4) is conductively connected to the anode connection gasket (22), and the other end is led out from the side of the rubber plug shell (11) toward the outside of the aluminum electrolytic capacitor; one end of the cathode welding terminal (5) is conductively connected to the cathode connection gasket (32), and the other end is led out from the side of the rubber plug shell (11) toward the outside of the aluminum electrolytic capacitor.

8. The sealing rubber plug for aluminum electrolytic capacitor according to claim 6, characterized in that: The anode riveted terminal (21) and the cathode riveted terminal (31) are columnar terminals.

9. The sealing rubber plug for aluminum electrolytic capacitor according to claim 4, characterized in that: The anode welding terminal (4) and the cathode welding terminal (5) are sheet-shaped terminals.

10. The sealing rubber plug for aluminum electrolytic capacitor according to claim 2, characterized in that: The main material of the rubber plug shell (11) is butyl rubber or EPDM rubber.

Images