Aluminum electrolytic capacitor

Abstract

The utility model discloses an aluminum electrolytic capacitor, comprising a metal housing, a core package packaged in the metal housing, and a metal cover plate used for packaging the core package in the metal housing. Wherein the metal cover plate comprises a cover plate main body, a terminal assembly arranged on the cover plate main body and a plurality of fixed contact pins; the cover plate main body comprises a circular plane and an annular belt which is arranged on the periphery of the circular plane and is vertical to the circular plane, and the terminal assembly is arranged on the circular plane and extends upwards in a manner of being vertical to the circular plane; and the plurality of fixed contact pins are arranged on the inner wall of the annular belt. The aluminum electrolytic capacitor provided by the utility model is strong in shock resistance, and can be suitable for various complex application environments with bumpiness and shock.

Description

Technical Field

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

[0002] The basic function of a capacitor is charging and discharging. With the continuous improvement of capacitor performance, aluminum electrolytic capacitors have been widely used in consumer electronics, communication products, computers and peripheral products, new energy, automation control, automotive industry, optoelectronic products, high-speed railways, aviation and military equipment, etc.

[0003] At present, aluminum electrolytic capacitors are generally composed of a core package consisting of positive and negative aluminum foils and electrolytic paper windings, a cylindrical aluminum shell, and a sealing cover plate with positive and negative terminal terminals. The cover plate is provided with positive and negative terminal lead-out holes, and the positive and negative terminals are installed on the cover plate through through holes. When in use, the positive and negative terminals are welded to the circuit board, so that the aluminum electrolytic capacitor is installed and fixed on the circuit board as a whole. However, this type of aluminum electrolytic capacitor is only suitable for small volumes and relatively stable application environments. For large-volume aluminum electrolytic capacitors or for use in complex environments with shaking or vibration, it is easy for the aluminum electrolytic capacitor to shake easily if the positive and negative terminals are welded to the circuit board alone. Long-term shaking eventually causes the positive and negative terminals to loosen or be damaged, thereby affecting the life of the whole product; especially when the aluminum electrolytic capacitor is used in a whole product with vibration and bumps such as new energy vehicles, the bumps and vibrations of the whole product are easy to cause the aluminum electrolytic capacitor to shake, thereby affecting the performance of the aluminum electrolytic capacitor and ultimately affecting the life of the whole product.

[0004] It can be seen that, with respect to the above-mentioned current existing technologies, it is necessary to conduct research and development to provide a solution, to provide an aluminum electrolytic capacitor with strong vibration resistance to adapt to various complex application environments with severe vibration.

[0005] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Utility Model Content

[0006] The purpose of the utility model is to provide an aluminum electrolytic capacitor to solve at least one of the above-mentioned background technical problems.

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

[0008] An aluminum electrolytic capacitor comprises a metal shell, a core package encapsulated in the metal shell, and a metal cover plate for encapsulating the core package in the metal shell; wherein the metal cover plate comprises a cover plate body, a terminal assembly arranged on the cover plate body, and a plurality of fixing pins; the cover plate body comprises a circular plane, an annular belt arranged at the periphery of the circular plane and perpendicular to the circular plane, the terminal assembly is arranged on the circular plane and extends upward perpendicular to the circular plane; the plurality of fixing pins are arranged on the inner wall of the annular belt.

[0009] In some embodiments, the fixing pin includes a fitting portion fitted with the inner wall of the annular belt, a plug-in portion connected to an external device, and a reinforcing portion arranged between the fitting portion and the plug-in portion.

[0010] In some embodiments, the fitting portion is configured in a sheet shape, and a punching hole is provided on one side of the fitting portion.

[0011] In some embodiments, the bonding portion is attached to the inner wall of the annular belt by welding or riveting.

[0012] In some embodiments, the surface of the fitting portion is a plane, and the end of the fitting portion is arranged in an arc shape.

[0013] In some embodiments, the plurality of fixing pins are equidistantly spaced on the inner wall of the annular belt.

[0014] In some embodiments, the annular band and the circular plane together form a disk shape with a concave bottom.

[0015] In some embodiments, an opening is provided at one end of the metal shell, and an annular groove is provided on the surface of the metal shell near the opening; the width of the annular groove is greater than the depth of the groove.

[0016] In some embodiments, the terminal assembly includes a lead-out metal guide pin; the lead-out metal guide pin includes a connection end connected to an external device, an aluminum stem, and a welding end connected to the core package.

[0017] In some embodiments, the fixing pin is parallel to the lead-out metal guide pin of the terminal assembly, and the height of the fixing pin is less than or equal to the height of the lead-out metal guide pin.

[0018] The beneficial effects of the technical solution of the utility model are:

[0019] Compared with the prior art, the aluminum electrolytic capacitor of the utility model has strong anti-vibration capability and can adapt to various complex application environments with bumps and vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a three-dimensional schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the utility model;

[0022] Figure 2 This is a partially exploded schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the utility model;

[0023] Figure 3 It is a three-dimensional schematic diagram of a metal cover plate of an aluminum electrolytic capacitor according to an embodiment of the utility model;

[0024] Figure 4 It is a three-dimensional schematic diagram of a fixing pin of an aluminum electrolytic capacitor according to an embodiment of the utility model;

[0025] Figure 5 It is an exploded schematic diagram of a terminal assembly of an aluminum electrolytic capacitor according to an embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the utility model clearer and more understandable, and to enable people in the technical field to better understand the solutions of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing or for circuit connection.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the utility model 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 cannot be understood as a limitation on the utility model.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, unless otherwise clearly specified and defined, the meaning of "multiple" is two or more, and the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0030] Reference Figure 1-Figure 4 As shown, as an embodiment of the utility model, an aluminum electrolytic capacitor 100 is provided, comprising a metal shell 10, a core package (not shown) encapsulated in the metal shell 10, and a metal cover 300 for encapsulating the core package in the metal shell 10; wherein the metal cover 300 comprises a cover body 30, a terminal assembly 400 arranged on the cover body 30, and a plurality of fixing pins 31; wherein the cover body 30 comprises a circular plane 301, a circular ring belt 302 arranged on the periphery of the circular plane and perpendicular to the circular plane, the terminal assembly 400 is arranged on the circular plane 301 and extends upward perpendicular to the circular plane 301; the plurality of fixing pins 31 are arranged on the inner wall of the ring belt 302.

[0031] Reference Figure 1-Figure 3 As shown, the annular belt 302 and the circular plane 301 are combined to form a disc shape with a concave bottom; the aluminum electrolytic capacitor cover plate 300 is encapsulated in the opening position of the aluminum electrolytic capacitor metal shell 10 by placing the annular belt 302 of the cover plate body 30 facing away from the core package. In some embodiments, the connection between the annular belt 302 and the circular plane 301 is set to be an arc transition.

[0032] Please refer to Figure 3, Figure 4 As shown, the fixing pin 31 includes a fitting portion 310 fitted with the inner wall of the annular belt 302, a plug-in portion 311 connected to an external device, and a reinforcing portion 312 disposed between the fitting portion 310 and the plug-in portion 311. In some embodiments, the fitting portion 310 is configured in a sheet shape, and a punching hole 313 is provided on one side of the fitting portion 310; the fitting portion 310 is attached to the inner wall of the annular belt 302 by welding or riveting. The reinforcing portion 312 is conical, and gradually decreases from the plug-in portion 311 to the fitting portion 310; the plug-in portion 311 is strip-shaped; it should be noted that in some other embodiments, the reinforcing portion 312 and the plug-in portion 311 can also be configured in other shapes.

[0033] In some embodiments, the surface of the fitting portion 310 is a plane, and the end of the fitting portion 310 is arranged in an arc shape.

[0034] In some embodiments, the plurality of fixing pins 31 are equidistantly spaced on the inner wall of the annular belt 302; in an embodiment of the utility model, the number of the fixing pins 31 is an even number, such as four, and the four fixing pins 31 are configured to be located at the four corners of a square; in some embodiments, the number of the fixing pins 31 may also be an odd number, such as three, and the three fixing pins 31 are configured to be located at the three vertices of an equilateral triangle.

[0035] Please refer to Figure 1 , Figure 2 As shown, an opening is provided at one end of the metal shell 10 , and an annular groove 101 is provided on the surface of the metal shell 10 near the opening; the width of the annular groove 101 is greater than the depth of the groove.

[0036] In some embodiments, the other end of the metal shell 10 is closed, thereby forming a receiving space with an opening at one end.

[0037] Please refer to Figure 2 , Figure 3 , Figure 4 As shown, the metal cover plate 300 is laser welded by welding the outer surface of the annular band of the cover plate body 30 to the inner surface of the metal shell 10, so as to encapsulate the metal cover plate 300 at the opening of the metal shell 10, and then encapsulate the core package in the metal shell. The annular groove 101 of the metal shell 10 forms a circle of protrusions 102 inside the shell, and the circular plane of the cover plate body 30 abuts against the protrusions 102, so that the top surface of the aluminum electrolytic capacitor is concave. Through the laser welding packaging of the metal cover plate, the closing position area of ​​the aluminum electrolytic capacitor packaging structure is reduced by more than 90%, and through the use of the metal cover plate, the metal area is increased to more than 95%, further improving the safety factor of the product.

[0038] Please refer to Figure 3-Figure 5 As shown, the circular plane 301 is provided with a terminal assembly mounting hole (not numbered); the terminal assembly 400 includes a lead-out metal guide pin 40, and the lead-out metal guide pin 40 includes a connection end 401 connected to an external device, an aluminum stem 402, and a welding end 403 connected to the core package. In some embodiments, the fixed pin 31 is parallel to the lead-out metal guide pin 40 of the terminal assembly 400, and the height of the fixed pin 31 is less than or equal to the height of the lead-out metal guide pin 40. When the aluminum electrolytic capacitor is installed on the circuit board, the fixed pin 31 on the metal cover plate 300 is fixed to the circuit board to stably connect and fix the metal cover plate 300 to the circuit board, and then the aluminum electrolytic capacitor is installed and fixed on the circuit board, thereby reducing the force on the lead-out metal guide pin and reducing damage to the lead-out metal guide pin.

[0039] When the metal cover of the aluminum electrolytic capacitor is packaged, the outer surface of the annular band 302 of the cover body 30 is laser welded to the inner surface of the metal shell 10, so that the metal cover 300 is packaged at the opening of the metal shell 10 of the aluminum electrolytic capacitor, and then the core package is packaged in the metal shell 10. Specifically, when the annular band 302 of the cover body 30 is packaged away from the core package, the connection end of the metal guide pin 40 extends outward from the concave side of the metal cover, and the surface of the metal cover of the aluminum electrolytic capacitor is concave.

[0040] Please refer to Figure 5 As shown, in some embodiments, the terminal assembly 400 also includes an insulating rubber seat 41 and a metal sleeve 42; specifically, the insulating rubber seat 41 is arranged between the lead-out metal guide pin 40 and the metal sleeve 42, and the metal sleeve 42 is welded to the terminal assembly mounting hole, thereby installing and fixing the terminal assembly 400 on the metal cover plate body 30.

[0041] Please refer to Figure 2 , Figure 3 , Figure 5 As shown, in some embodiments, the width of the circular belt 302 is smaller than the height of the metal sleeve 42 of the terminal assembly 400; the outer diameter of the metal sleeve 42 is adapted to the mounting hole of the terminal assembly; the insulating rubber seat 41 of the terminal assembly 400 includes a cylindrical sleeve 410 and a circular chassis 411, and the outer diameter of the circular chassis 411 is larger than the aperture of the mounting hole of the terminal assembly.

[0042] In some embodiments, there are two terminal assembly mounting holes for mounting the positive and negative terminal assemblies. The two terminal assembly mounting holes are symmetrically or asymmetrically arranged on the metal cover body 30 .

[0043] Reference Figure 5As shown, the insulating rubber seat 41 of the terminal assembly is arranged between the lead-out metal guide pin 40 and the metal sleeve 42 to insulate the lead-out metal guide pin 40 from the metal sleeve 42; the lead-out metal guide pin 40 includes a connecting end 401 connected to an external device, an aluminum stem 402 and a welding end 403 connected to the core package.

[0044] In an embodiment of the utility model, the connection end 401 of the lead-out metal guide pin 40 connected to the external device and the aluminum stem 402 are circular strips, wherein the diameter of the aluminum stem 402 is greater than the diameter of the connection end 401 connected to the external device, and the length of the connection end 401 connected to the external device is greater than the length of the aluminum stem 402; the welding end 403 connected to the core package is disc-shaped and is welded to the battery cell of the aluminum electrolytic capacitor through the welding end 403 connected to the core package.

[0045] Please refer to Figure 5 As shown, the center of the insulating rubber seat 41 is provided with a through hole 412 that matches the aluminum stem 402 for leading out the metal guide pin, and the outer diameter of the aluminum stem 402 is adapted to the inner diameter of the through hole 412, so that the aluminum stem 402 can be tightly sleeved inside the through hole 412. In some embodiments, the length of the through hole 412 is greater than the length of the aluminum stem 402. In some embodiments, the diameter of the cylindrical sleeve 410 is smaller than the diameter of the circular bottom plate 411. The circular bottom plate 411 of the insulating rubber seat 41 abuts against the welding end 403 of the metal guide pin 40 connected to the core package.

[0046] The metal sleeve 42 is sleeved on the surface of the cylindrical sleeve 410 of the insulating rubber seat 41. Corresponding to the cylindrical sleeve 410, the metal sleeve 42 is cylindrical, the inner diameter of the metal sleeve 42 is matched with the outer diameter of the cylindrical sleeve 410, the length of the metal sleeve 42 is greater than the length of the cylindrical sleeve 410, and the metal sleeve 42 is sleeved on the surface of the cylindrical sleeve 410 and then waisted. One end of the metal sleeve 42 is low-connected to the circular bottom plate 411 of the insulating rubber seat 41, and the other end is buckled with the cylindrical sleeve 410 of the insulating rubber seat 41 by crimping. In some implementations, the metal sleeve 42 is an aluminum tube.

[0047] In some embodiments, a welding end 403 of the lead-out metal guide pin 40 connected to the core package is provided with a circular protrusion 404 on the upper surface, and an annular groove 405 is formed between the circular protrusion 404 and the bottom of the aluminum stem; such a design allows the metal sleeve 42 to squeeze the insulating rubber seat 41 when the waist is tightened, and the circular bottom plate 411 of the insulating rubber seat 41 is partially squeezed and embedded in the annular groove 405, and at the same time, the circular protrusion 404 is squeezed and embedded in the circular bottom plate 411 of the insulating rubber seat 41, so that the insulating rubber seat 41 and the lead-out metal guide pin 40 are tightly combined together.

[0048] In some embodiments, a current collector is led out from the core package, and an insulator is provided between the core package and the metal cover plate 300 to prevent the current collector from contacting and conducting with the metal cover plate 300. Specifically, the core package includes a current collector, electrolytic paper (unnumbered), cathode foil (unnumbered), and anode foil (unnumbered), wherein an electrolytic paper layer is provided in the innermost layer of the core package and between the cathode foil and the anode foil; the current collector includes an anode current collector and a cathode current collector; specifically, a negative electrode current collector is led out from the cathode foil, and a positive electrode current collector is led out from the anode foil; as an embodiment of the present invention, the arrangement order of the electrolytic paper, cathode foil, and anode foil is electrolytic paper, cathode foil, electrolytic paper, and anode foil.

[0049] It is understandable that the above content is a further detailed description of the invention of the utility model in combination with specific / preferred implementation methods, and it cannot be determined that the specific implementation of the invention of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the invention of the utility model belongs, without departing from the concept of the invention of the utility model, they can also make several substitutions or modifications to these described implementation methods, and these substitutions or modifications should be deemed to belong to the scope of protection of this patent. In the description of this specification, the description of reference terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model.

[0050] In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other. Although the embodiments and advantages of the utility model have been described in detail, it should be understood that various changes, substitutions and modifications may be made herein without departing from the scope defined by the appended claims.

[0051] In addition, the scope of the 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. It will be readily understood by those skilled in the art that the above disclosures, processes, machines, manufactures, material compositions, means, methods, or steps currently existing or to be developed later that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein may be utilized. Therefore, the appended claims are intended to include these processes, machines, manufactures, material compositions, means, methods, or steps within their scope.

Claims

1. An aluminum electrolytic capacitor, characterized in that: It includes a metal shell, a core package encapsulated in the metal shell, and a metal cover plate for encapsulating the core package in the metal shell; wherein the metal cover plate includes a cover plate body, a terminal assembly arranged on the cover plate body, and a plurality of fixing pins; the cover plate body includes a circular plane, an annular belt arranged on the periphery of the circular plane and perpendicular to the circular plane, the terminal assembly is arranged on the circular plane and extends upward perpendicular to the circular plane; the plurality of fixing pins are arranged on the inner wall of the annular belt.

2. The aluminum electrolytic capacitor according to claim 1, wherein: The fixed pin includes a fitting portion fitted with the inner wall of the annular belt, a plug-in portion connected to an external device, and a reinforcing portion arranged between the fitting portion and the plug-in portion.

3. The aluminum electrolytic capacitor according to claim 2, wherein: The bonding part is configured in a sheet shape, and a punching hole is provided on one side of the bonding part.

4. The aluminum electrolytic capacitor according to claim 2, wherein: The bonding portion is bonded to the inner wall of the annular belt by welding or riveting.

5. The aluminum electrolytic capacitor according to claim 2, wherein: The surface of the fitting portion is a plane, and the end of the fitting portion is arranged in an arc shape.

6. The aluminum electrolytic capacitor according to claim 1, wherein: The plurality of fixed pins are arranged at equal intervals on the inner wall of the annular belt.

7. The aluminum electrolytic capacitor according to claim 1, wherein: The annular belt and the circular plane together form a disc shape with a concave bottom.

8. The aluminum electrolytic capacitor according to claim 1, wherein: An opening is arranged at one end of the metal shell, and an annular groove is arranged on the surface of the metal shell near the opening; the width of the annular groove is greater than the depth of the groove.

9. The aluminum electrolytic capacitor according to claim 1, wherein: The terminal assembly includes a lead-out metal guide pin; the lead-out metal guide pin includes a connection end connected to an external device, an aluminum stem, and a welding end connected to a core package.

10. The aluminum electrolytic capacitor according to claim 9, wherein: The fixed pin is parallel to the lead-out metal guide pin of the terminal assembly, and the height of the fixed pin is less than or equal to the height of the lead-out metal guide pin.

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