CN117292947A

CN117292947A - Compact electrolytic capacitor

Info

Publication number: CN117292947A
Application number: CN202311341370.7A
Authority: CN
Inventors: 尹志华; 李良; 尹超
Original assignee: Shenzhen Jianghao Electron Co ltd
Current assignee: Shenzhen Jianghao Electron Co ltd
Priority date: 2023-10-16
Filing date: 2023-10-16
Publication date: 2023-12-26

Abstract

The invention discloses a compact electrolytic capacitor, which comprises a metal shell, a plurality of core-spun monomers encapsulated in the metal shell, a metal cover plate for encapsulating the core-spun monomers in the metal shell, and a terminal assembly welded on the metal cover plate through laser; the terminal assembly comprises a lead-out metal guide pin, an insulating rubber seat and a metal sleeve; the insulating rubber seat is arranged between the lead-out metal guide pin and the metal sleeve, so that the lead-out metal guide pin is insulated from the metal sleeve, and two ends of the insulating rubber seat protrude out of the metal sleeve and are exposed outside the metal sleeve. The compact electrolytic capacitor can maximize the volume capacity density of the capacitor and further meet the requirements of high-energy density scenes.

Description

Compact electrolytic capacitor

Technical Field

The invention belongs to the technical field of capacitors, and particularly relates to a compact electrolytic capacitor.

Background

The basic function of the capacitor is charging and discharging, and with the continuous improvement of the capacitor performance, the aluminum electrolytic capacitor has been widely applied to consumer electronics products, communication products, computers and peripheral products, new energy, automation control, automobile industry, photoelectric products, high-speed railway and aviation and military equipment, etc. In the technical field of consumer electronics, the application of the aluminum electrolytic capacitor has the characteristics of small volume, large stored electric quantity and high cost performance along with structural transformation and technical progress, and the aluminum electrolytic capacitor is expanded in various emerging fields such as energy-saving lamps, frequency converters, new energy sources and the like, and has wider application range.

At present, the filter capacitor adopted by high energy density is generally a horizontal large-sized aluminum electrolytic capacitor, the volume density is very high, but the filter capacitor is in a cylindrical shape, when the filter capacitor is applied to the fields of new energy automobiles and the like, the space occupied by the capacitor is small, but the space occupied by the vertical space cabin of the whole machine layout is large, and the maximum duty ratio capacity is difficult to achieve.

It can be seen that, in view of the above-mentioned prior art, there is a need to develop and research to provide a solution, a compact electrolytic capacitor, and a capacitor with maximized volumetric capacity density, so as to further meet the requirements of high energy density.

The foregoing background is only for the purpose of providing an understanding of the inventive concepts and technical aspects of the present invention and is not necessarily prior art to the present application and is not intended to be used to evaluate the novelty and creativity of the present application in the event that no clear evidence indicates that such is already disclosed at the filing date of the present application.

Disclosure of Invention

The present invention is directed to a compact electrolytic capacitor that solves at least one of the above-mentioned problems of the related art.

In order to achieve the above object, the technical solution of the embodiment of the present invention is as follows:

a compact electrolytic capacitor comprises a metal shell, a plurality of core-package monomers encapsulated in the metal shell, a metal cover plate for encapsulating the core-package monomers in the metal shell, and a terminal assembly welded on the metal cover plate through laser; the terminal assembly comprises a lead-out metal guide pin, an insulating rubber seat and a metal sleeve; the insulating rubber seat is arranged between the lead-out metal guide pin and the metal sleeve, so that the lead-out metal guide pin is insulated from the metal sleeve, and two ends of the insulating rubber seat protrude out of the metal sleeve and are exposed outside the metal sleeve.

In some embodiments, the metal sleeve is laser welded to a metal cover plate of the electrolytic capacitor, which is laser welded to an opening of the metal case.

In some embodiments, the lead-out metal lead comprises a CP lead, an aluminum stem and a welded base; the CP lead wire leading out the metal guide pin and the aluminum stem are in a circular strip shape, wherein the diameter of the aluminum stem is larger than that of the CP lead wire, and the length of the CP lead wire is larger than that of the aluminum stem.

In some embodiments, the weld base is disk-shaped, and the lead-out metal lead is welded to the electrolytic capacitor core pack through the weld base.

In some embodiments, a current collector is led out of each core-spun single body, and an insulator is arranged between the core-spun single body and the metal cover plate.

In some embodiments, the core wrap monomer is substantially in the shape of a flat rectangle comprising a current collector, electrolytic paper, cathode foil, and anode foil; wherein, the innermost layer of the core package monomer and the space between the cathode foil and the anode foil are respectively provided with an electrolytic paper layer.

In some embodiments, the metal shell is a square container that is open at one end.

In some embodiments, one end of the metal shell is provided with a square opening, and the metal shell is square column-shaped; the core bag formed by the plurality of core bag monomers is placed in the metal shell through the square opening of the metal shell.

In some embodiments, the metal cover is generally square and includes a metal cover body on which the terminal assembly is disposed.

In some embodiments, the metal cover body is provided with a groove, and a bottom surface of the groove is provided with a terminal assembly mounting hole; the metal sleeve of the terminal assembly is welded at the terminal assembly mounting hole, so that the terminal assembly is mounted and fixed on the metal cover plate main body.

The technical scheme of the invention has the beneficial effects that:

compared with the prior art, the compact electrolytic capacitor can maximize the volume capacity density of the capacitor, and further meets the requirement of high-energy density scenes.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a perspective view of a compact electrolytic capacitor according to an embodiment of the present invention;

FIG. 2 is a partially exploded schematic illustration of a compact electrolytic capacitor in accordance with one embodiment of the invention;

FIG. 3 is another exploded view of a compact electrolytic capacitor according to one embodiment of the present invention;

FIG. 4 is a partially exploded schematic illustration of a compact electrolytic capacitor in accordance with one embodiment of the invention;

FIG. 5 is a schematic view of a terminal assembly of a compact electrolytic capacitor according to one embodiment of the invention;

FIG. 6 is a perspective view of a compact electrolytic capacitor according to another embodiment of the present invention;

FIG. 7 is an exploded view of a terminal assembly of a compact electrolytic capacitor according to one embodiment of the present invention;

FIG. 8 is a schematic view of an insulating rubber mount of a terminal assembly of a compact electrolytic capacitor according to one embodiment of the present invention;

FIG. 9 is a cutaway illustration of a terminal assembly of a compact electrolytic capacitor in accordance with one embodiment of the present invention;

FIG. 10 is a partially exploded view of a compact electrolytic capacitor according to another embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clear and make those skilled in the art better understand the solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for a fixing function or for a circuit communication function.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the invention and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In describing embodiments of the present invention, unless explicitly stated and limited otherwise, the meaning of "plurality" is two or more, and the terms "mounted," "connected," "secured," etc. are to be construed broadly, as for example, they may be fixedly connected, detachably connected, or as a unit; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 10, as an embodiment of the present invention, there is provided a compact electrolytic capacitor 100 including a metal case 10, a plurality of core pack units 20 encapsulated in the metal case 10, a metal cap plate 300 for encapsulating the plurality of core pack units 20 in the metal case, and a terminal assembly 400 welded to the metal cap plate by laser; wherein the terminal assembly 400 includes a lead-out metal lead 40, an insulating rubber seat 41, and a metal sleeve 42; the insulating rubber seat 41 is disposed between the lead-out metal pin 40 and the metal sleeve 42, so that the lead-out metal pin 40 is insulated from the metal sleeve 42, and two ends of the insulating rubber seat protrude out of the metal sleeve and are exposed outside the metal sleeve.

Referring to fig. 7-9, the lead-out metal pin 40 includes a CP lead 401, an aluminum stem 402, and a welding base 403; in some embodiments, the metal cover plate is welded to the opening of the metal shell by laser, and the metal sleeve is welded to the metal cover plate of the electrolytic capacitor by laser.

It should be noted that, in the embodiment of the present invention, the CP lead 401 from which the metal lead is led out and the aluminum stem 402 are in a circular strip shape, wherein the diameter of the aluminum stem 402 is greater than the diameter of the CP lead 401, and the length of the CP lead 401 is greater than the length of the aluminum stem 402; the welding base 403 is disk-shaped, and the lead metal pins are welded to a core package (not shown) of the electrolytic capacitor through the welding base 403.

Referring to fig. 7 to 9, the insulating rubber mount 41 includes a cylindrical tube 410 and a circular bottom plate 411; the cylindrical tube 410 includes a first cylindrical tube and a second cylindrical tube having the same inner diameter; the outer diameter of the first cylindrical pipe is smaller than that of the second cylindrical pipe, and the length of the first cylindrical pipe is smaller than that of the second cylindrical pipe; the length of the second cylindrical pipe is smaller than that of the metal sleeve. The center of the insulating rubber seat 41 is provided with a through hole 412 matched with the aluminum stem 402 from which the metal guide pin is led out, and the outer diameter of the aluminum stem 402 is matched with 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 two cylindrical tubes is less than the diameter of the circular chassis 411. The circular chassis 411 of the insulating rubber mount 41 is abutted against the welding base 403 from which the metal lead 40 is led out.

The metal sleeve 42 is sleeved on the surface of the cylindrical tube 410 of the insulating rubber seat 41, corresponding to the cylindrical tube 410, the metal sleeve 42 is cylindrical, the inner diameter of the metal sleeve 42 is matched with the outer diameter of the second cylindrical tube 410, the length of the metal sleeve 42 is larger than that of the second cylindrical tube, the metal sleeve 42 is sleeved on the surface of the second cylindrical tube 410 to be bunched, one end of the metal sleeve 42 is connected with the circular chassis 411 of the insulating rubber seat 41 in a low-pressure manner, and the other end of the metal sleeve 42 is buckled with the second cylindrical tube 410 of the insulating rubber seat 41 through curling; the first cylindrical tube is higher than the metal sleeve, and the curled edge of the metal sleeve is isolated from the leading-out metal guide pin, so that the insulation effect of the metal sleeve and the leading-out metal guide pin is better. In some implementations, the metal sleeve 42 is an aluminum tube.

Referring to fig. 7 and 9, in some embodiments, an annular protruding strip 404 is disposed on the upper surface of the welding base 403 of the lead-out metal lead pin 40, and an annular groove 405 is formed between the annular protruding strip 404 and the bottom of the aluminum stem; so designed, when the metal sleeve 42 is in a girdling state, the insulating rubber seat 41 is extruded, the circular chassis 411 of the insulating rubber seat 41 is partially extruded and embedded into the annular groove 405, and meanwhile, the circular protruding strip 404 is extruded and embedded into the circular chassis 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.

Referring to fig. 2-4, in some embodiments, a current collector 21 is led out from each core-package unit 20, and an insulator 301 is disposed between the core-package unit 20 and the metal cover 300, so as to avoid contact conduction between the current collector 21 and the metal cover 300; the metal cover 300 and the metal shell 10 are connected together by laser welding to encapsulate the plurality of core pack units 20 in the metal shell 10.

The core-package unit 20 comprises a current collector 21, electrolytic paper (not numbered), cathode foil (not numbered) and anode foil (not numbered), wherein electrolytic paper layers are respectively arranged between the innermost layer of the core-package unit 20 and the cathode foil and the anode foil; the current collector 21 comprises an anode current collector and a cathode current collector; specifically, a negative current collector is led out of the cathode foil, and a positive current collector is led out of the anode foil; as an embodiment of the invention, the electrolytic paper, the cathode foil and the anode foil are arranged in sequence. In another embodiment, after the electrolytic paper and the cathode foil are wound into a flat shape with a certain thickness, adding the positive foil and continuing to wind into a flat shape until the quantitative cutting length of the positive foil is fully wrapped in the electrolytic paper and the cathode composite layer. In some embodiments, the core wrap monomer 20 is generally in the shape of a flat rectangle, and a plurality of core wrap monomers are tightly adhered together.

Referring to fig. 2 and 3, the metal casing 10 is a square container with one end open, and is made of metal; in particular, the metal shell 10 may be an aluminum shell, a stainless steel shell, or an alloy shell. In some embodiments, one end of the metal shell 10 is provided with a square opening, and the metal shell 10 is square column-shaped; the core pack formed by the plurality of core pack units 20 is placed in the metal shell through the square opening of the metal shell 10. In some embodiments, rounded transitions are provided at the corners of the metal shell 10.

Referring to fig. 2 and 3, the metal cover 300 is encapsulated at the square opening 101 of the metal casing 10, and is connected to the metal casing 10 by laser welding, and the metal cover 300 is substantially square and includes a metal cover body 30, and the terminal assembly 400 is disposed on the metal cover body 30; wherein, the metal cover body 30 is provided with a groove 31, and a terminal assembly mounting hole 310 is arranged on the bottom surface of the groove 31; the metal sleeve 42 of the terminal assembly is welded to the terminal assembly mounting hole 310, thereby mounting and fixing the terminal assembly 400 to the metal cap plate body 30.

Referring to fig. 1, 6 and 10, the opening edge of the groove 31 of the metal cover main body 30 is provided with an arc shape to form an arc opening inclined inwards; the junction of the bottom surface and the peripheral side surfaces of the groove 31 is provided with an arc transition. In the embodiment of the present invention, the recess 31 of the metal cover body 30 is square. In some embodiments, the metal cover body 30 may also have a rectangular shape, and the connection between each two adjacent surfaces of the outer surface of the metal cover body 30 is configured to have an arc shape. In some embodiments, the metal cover plate is provided with a groove, and the core package is enclosed in the metal shell outwards or inwards; when the groove faces outwards, the surface of the cover plate of the electrolytic capacitor is concave; and when the grooves face inwards, the surface of the cover plate of the electrolytic capacitor is plane.

It should be noted that, in other embodiments, the metal cover body 30 and/or the groove 31 of the metal cover body 30 may be configured in other shapes, and no matter what shape is configured, the metal cover body and the groove should fall within the protection scope of the present invention.

Referring to fig. 6 and 10, in some embodiments, the depth of the recess 31 is less 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 terminal assembly mounting hole 310; the insulating rubber seat 41 of the terminal assembly comprises a cylindrical sleeve 410 and a circular chassis 411, wherein the outer diameter of the circular chassis 411 is larger than the aperture of the terminal assembly mounting hole 310. The metal sleeve 42 is welded to the metal cap plate 300 at the terminal assembly mounting hole 310 by laser so that the terminal assembly 400 is fixed to the metal cap plate 300.

In some embodiments, the terminal assembly mounting holes 310 are two for mounting positive and negative terminals. The two terminal assembly mounting holes 310 are symmetrically or asymmetrically provided on the metal cap body 30. The insulator 301 is provided in a square shape corresponding to the metal cap body 30, and is provided with a guide pin hole 302 corresponding to the terminal assembly mounting hole 310.

In some embodiments, the welded base 403 of the metal lead is welded to the current collector 21 of the core pack monomer 20 by laser. The metal guide pin 40 comprises a positive metal guide pin and a negative metal guide pin, and a welding base of the positive metal guide pin and a welding base of the negative metal guide pin are welded on a positive current collector and a negative current collector of the core pack respectively through laser welding. In the embodiment of the invention, the positive electrode current collectors of the plurality of core pack monomers 20 are mutually connected together and are fixedly connected with the welding base of the positive electrode metal guide pin through laser welding; the negative electrode current collectors of the plurality of core package monomers 20 are mutually connected together and are fixedly connected with the welding base of the negative electrode metal guide pin through laser welding.

In some embodiments, the current collector 21 is in a flat sheet shape, and the current collectors of two adjacent core-spun units 20 are bent in the same direction or in opposite directions.

In the embodiment of the present invention, the CP lead 401 from which the metal lead 40 is led out and the aluminum stem 402 are in a circular strip shape, wherein the diameter of the aluminum stem 402 is greater than the diameter of the CP lead 401, and the length of the CP lead 401 is greater than the length of the aluminum stem 402; the welding base 403 is disk-shaped, and is welded to the core bag of the electrolytic container through the welding base 403.

It should be understood that, in some embodiments, the lead-out metal pins 40 may be in the shape of strips with other irregular patterns, and the shapes of the lead-out metal pins are not particularly limited in this embodiment, and any pattern should be included in the protection scope of the present application as long as the pattern does not deviate from the gist of the present application.

It is to be understood that the foregoing is a further detailed description of the present invention in connection with the specific/preferred embodiments, and that no particular implementation of the present invention is to be considered limited to such description. It will be apparent to those skilled in the art to which the present invention pertains that many substitutions and modifications of these described embodiments may be made without departing from the inventive concepts herein, and these substitutions and modifications are intended to be within the scope of this patent. In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention.

In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope as defined by the appended claims.

Furthermore, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. Those of ordinary skill in the art will readily appreciate that the above-described disclosures, procedures, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

Claims

1. A compact electrolytic capacitor, characterized by: the metal cover plate comprises a metal shell, a plurality of core package monomers encapsulated in the metal shell, a metal cover plate used for encapsulating the core package monomers in the metal shell, and a terminal assembly welded on the metal cover plate through laser; the terminal assembly comprises a lead-out metal guide pin, an insulating rubber seat and a metal sleeve; the insulating rubber seat is arranged between the lead-out metal guide pin and the metal sleeve, so that the lead-out metal guide pin is insulated from the metal sleeve, and two ends of the insulating rubber seat protrude out of the metal sleeve and are exposed outside the metal sleeve.

2. The compact electrolytic capacitor of claim 1 wherein: the metal sleeve is welded on a metal cover plate of the electrolytic capacitor through laser, and the metal cover plate is welded at an opening of the metal shell through laser.

3. The compact electrolytic capacitor of claim 1 wherein: the lead-out metal guide pin comprises a CP lead, an aluminum stem and a welding base; the CP lead wire leading out the metal guide pin and the aluminum stem are in a circular strip shape, wherein the diameter of the aluminum stem is larger than that of the CP lead wire, and the length of the CP lead wire is larger than that of the aluminum stem.

4. A compact electrolytic capacitor as claimed in claim 3, wherein: the welding base is disc-shaped, and the lead-out metal guide pin is welded on the core package of the electrolytic capacitor through the welding base.

5. The compact electrolytic capacitor of claim 1 wherein: and a current collector is led out of each core-spun monomer, and an insulator is arranged between the core-spun monomer and the metal cover plate.

6. The compact electrolytic capacitor of claim 1 wherein: the core-spun single body is in a flat rectangular shape and comprises a current collector, electrolytic paper, cathode foil and anode foil; wherein, the innermost layer of the core package monomer and the space between the cathode foil and the anode foil are respectively provided with an electrolytic paper layer.

7. The compact electrolytic capacitor of claim 1 wherein: the metal shell is a square container with one end open.

8. The compact electrolytic capacitor of claim 1 wherein: one end of the metal shell is provided with a square opening, and the metal shell is square column-shaped; the core bag formed by the plurality of core bag monomers is placed in the metal shell through the square opening of the metal shell.

9. The compact electrolytic capacitor of claim 8 wherein: the metal cover plate is approximately square and comprises a metal cover plate main body, and the terminal assembly is arranged on the metal cover plate main body.

10. The compact electrolytic capacitor of claim 9 wherein: the metal cover plate main body is provided with a groove, and the bottom surface of the groove is provided with a terminal assembly mounting hole; the metal sleeve of the terminal assembly is welded at the terminal assembly mounting hole, so that the terminal assembly is mounted and fixed on the metal cover plate main body.