CN219202965U

CN219202965U - Electrolytic capacitor

Info

Publication number: CN219202965U
Application number: CN202320082023.6U
Authority: CN
Inventors: 许璟华; 宋红石; 张守辉
Original assignee: Zhongke Ruige Yantai Technical Service Co ltd
Current assignee: Zhongke Ruige Yantai Technical Service Co ltd
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-06-16
Anticipated expiration: 2033-01-13

Abstract

The utility model relates to the technical field of electronic components and discloses an electrolytic capacitor, which comprises a capacitor core and a metal shell, wherein the capacitor core comprises first electrolytic paper, positive electrode foil, second electrolytic paper and negative electrode foil are sequentially stacked below the first electrolytic paper, one end of the positive electrode foil is fixedly connected with a positive electrode lug, one end of the negative electrode foil, which is far away from the positive electrode lug, is fixedly connected with a negative electrode lug, the capacitor core is arranged in the metal shell with one open end, the negative electrode lug and the negative electrode foil are both connected with the metal shell, the positive electrode lug is connected with a metal cover, and an insulating ring for isolating the metal shell from the positive electrode foil is arranged between the metal cover and the metal shell; the utility model shortens the current path, avoids the inherent equivalent series inductance effect and equivalent series resistance effect of the electrolytic capacitor, can improve the high-frequency performance of the electrolytic capacitor, reduces the loss, and can improve the working frequency, increase the instant charge and discharge current, reduce the heating value and improve the reliability in the electronic circuit acted by the electrolytic capacitor.

Description

Electrolytic capacitor

Technical Field

The utility model relates to the technical field of electronic components, in particular to an electrolytic capacitor.

Background

With the continuous development of modern electronic technology, the trend of circuit digitization and high frequency has become a major bureau, high ESL affects high frequency characteristics in electronic devices, high ESR generates loss and heat in electronic circuits, these two parameters directly reduce the performance and reliability of the circuits, and the requirements for low ESR and low ESL electrolytic capacitors are increasing, so that newer applications are as follows: the high-performance capacitor in the fields of charging piles, secondary power supplies, UPS power supplies, inverters, automobile starting, storage of wind energy and light energy power generation and the like is an essential component. The electrolytic capacitor with low ESL and low ESR is indispensable for improving the frequency, reducing the volume, reducing the loss, improving the reliability and the like of the product.

In order to solve the problems of high ESR and high ESL of the electrolytic capacitor, in the prior art, the high-frequency low-resistance characteristic of the electrolytic capacitor is improved from the aspect of materials, and the structure is improved by adopting double-layer winding, but the problems have limitations and cannot fundamentally solve the inherent defects of high ESL and ESR of the coiled electrolytic capacitor.

Disclosure of Invention

The utility model aims to provide an electrolytic capacitor, which aims to shorten a current path, avoid an inherent equivalent series inductance Effect (ESL) and an inherent equivalent series resistance Effect (ESR) of the electrolytic capacitor, improve the high-frequency performance of the electrolytic capacitor, reduce loss, improve the working frequency, increase instant charging and discharging current, reduce heating value and improve the reliability in an electronic circuit acted by the electrolytic capacitor.

The utility model is realized in the following way:

the utility model provides an electrolytic capacitor, includes capacitor core and metal casing, the capacitor core includes first electrolysis paper, positive pole foil, second electrolysis paper and negative pole foil have been stacked in proper order to the below of first electrolysis paper, the one end fixedly connected with positive pole ear of positive pole foil, the negative pole foil is kept away from positive pole ear one end fixedly connected with negative pole ear, the capacitor core sets up in one end open-ended in the metal casing, negative pole ear and negative pole foil all with the metal casing is connected, positive pole ear is connected with the metal cover, the metal cover with be provided with between the metal casing be used for keeping apart the metal casing with the insulating ring of positive pole foil, the insulating ring sets up between positive pole ear with the metal cover.

Further, the first electrolytic paper, the positive electrode foil, the second electrolytic paper and the negative electrode foil are all in a strip shape, one ends of the positive electrode foil connected with the positive electrode lugs are respectively higher than the edges of the first electrolytic paper, the second electrolytic paper and the negative electrode foil, the positive electrode lugs are matched with the positive electrode foil, one ends of the negative electrode foils connected with the negative electrode lugs are respectively higher than the edges of the first electrolytic paper, the second electrolytic paper and the positive electrode foil, and the negative electrode lugs are matched with the negative electrode foil.

Further, the positive electrode lug and the negative electrode lug are both zigzag.

Further, one end of the opening of the metal shell is fixedly connected with a resistance ring for limiting the metal cover and the insulating ring.

Compared with the prior art, the utility model has the beneficial effects that:

in practical application, the first electrolytic paper, the positive electrode foil, the second electrolytic paper and the negative electrode foil take one end between the positive electrode lug and the negative electrode lug as an axle center, and are wound to one side of the first electrolytic paper to form a columnar capacitor core, and the lead-out electrode of the electrolytic capacitor is directly led out through the positive electrode lug on the positive electrode foil and the negative electrode lug on the negative electrode foil to form an equivalent parallel structure of a plurality of electrolytic capacitors.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a schematic of the overall structure of the present utility model;

FIG. 2 is a schematic view of the structure of the capacitor core of the present utility model;

FIG. 3 is a schematic view of the structure of the insulating ring of the present utility model;

fig. 4 is a schematic structural view of the positive electrode foil of the present utility model;

fig. 5 is a schematic structural view of the negative electrode foil of the present utility model;

fig. 6 is a cross-sectional view of a schematic of the metal housing structure of the present utility model.

Reference numerals: a metal housing 1; a capacitor core 2; a first electrolytic paper 3; a positive electrode foil 4; a second electrolytic paper 5; a negative electrode foil 6; a positive electrode tab 7; a negative electrode tab 8; a metal cover 9; an insulating ring 10; resistance ring 11.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Referring to fig. 1 to 6, an electrolytic capacitor includes a capacitor core 2 and a metal housing 1, the capacitor core 2 includes a first electrolytic paper 3, a positive electrode foil 4, a second electrolytic paper 5 and a negative electrode foil 6 are stacked under the first electrolytic paper 3 in sequence, one end of the positive electrode foil 4 is fixedly connected with a positive electrode tab 7, one end of the negative electrode foil 6 away from the positive electrode tab 7 is fixedly connected with a negative electrode tab 8, the capacitor core 2 is disposed in the metal housing 1 with one end open, the negative electrode tab 8 and the negative electrode foil 6 are connected with the metal housing 1, the positive electrode tab 7 is connected with a metal cover 9, an insulating ring 10 for isolating the metal housing 1 and the positive electrode foil 4 is disposed between the metal cover 9 and the metal housing 1, and the insulating ring 10 is disposed between the positive electrode tab 7 and the metal cover 9.

In practical application, the first electrolytic paper 3, the positive electrode foil 4, the second electrolytic paper 5 and the negative electrode foil 6 take one end between the positive electrode lug 7 and the negative electrode lug 8 as an axis, and are wound to one side of the first electrolytic paper 3 to form the columnar capacitor core 2, and the lead-out electrode of the electrolytic capacitor is directly led out through the positive electrode lug 7 on the positive electrode foil 6 and the negative electrode lug 8 on the negative electrode foil 6 to form an equivalent parallel structure of a plurality of electrolytic capacitors.

Referring to fig. 1 to 6, the first electrolytic paper 3, the positive electrode foil 4, the second electrolytic paper 5 and the negative electrode foil 6 are strip-shaped, one ends of the positive electrode foil 4 connected with the positive electrode tab 7 are respectively higher than edges of the first electrolytic paper 3, the second electrolytic paper 5 and the negative electrode foil 6, the positive electrode tab 7 is matched with the positive electrode foil 4, one ends of the negative electrode foil 6 connected with the negative electrode tab 8 are respectively higher than edges of the first electrolytic paper 3, the second electrolytic paper 5 and the positive electrode foil 4, and the negative electrode tab 8 is matched with the negative electrode foil 6. In this embodiment, the positive electrode foil 4 and the positive electrode tab 7 are connected with one end and the negative electrode foil 6 and the negative electrode tab 8 are connected with one end, and are respectively higher than the edges of the first electrolytic paper 3 and the second electrolytic paper 5, so that the positive electrode tab 7 and the negative electrode tab 8 are conveniently flattened towards the axis direction of the capacitor core 2, the length of the positive electrode tab 7 is matched with the length of the positive electrode foil 4, and the length of the negative electrode tab 8 is matched with the length of the negative electrode foil 6, thereby being beneficial to reducing the equivalent parallel resistance.

Referring to fig. 1 to 6, the positive electrode tab 7 and the negative electrode tab 8 are zigzag. In this embodiment, the heights of the zigzag positive electrode tab 7 and the zigzag negative electrode tab 8 are between 1 mm and 4mm, so that the positive electrode tab 7 and the negative electrode tab 8 can be flattened towards the axial direction conveniently, and the fit connection between the winding circumferences of the positive electrode tab 7 and the negative electrode tab 8 can be satisfied.

Referring to fig. 1 to 6, a resistance ring 11 for limiting the metal cover 9 and the insulating ring 10 is fixedly connected to the open end of the metal housing 1. In this embodiment, the resistance ring 11 and the metal housing 1 are integrally formed, and the resistance ring 11 is used for limiting and pressing the metal cover 9 and the insulating ring 10, so that the positive electrode lug 7 is connected with the metal upper cover more stably, and the metal housing 1 and the metal cover 9 are surrounded to form a sealing cylinder by the limitation of the resistance ring 11.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An electrolytic capacitor, characterized in that: including capacitor core (2) and metal casing (1), capacitor core (2) include first electrolysis paper (3), positive pole foil (4), second electrolysis paper (5) and negative pole foil (6) have been stacked in proper order to the below of first electrolysis paper (3), the one end fixedly connected with positive pole ear (7) of positive pole foil (4), negative pole foil (6) are kept away from positive pole ear (7) one end fixedly connected with negative pole ear (8), capacitor core (2) set up in one end open-ended in metal casing (1), negative pole ear (8) and negative pole foil (6) all with metal casing (1) are connected, positive pole ear (7) are connected with metal lid (9), metal lid (9) with be provided with between metal casing (1) and be used for keeping apart metal casing (1) with insulating ring (10) of positive pole foil (4), insulating ring (10) set up between positive pole ear with the metal lid.

2. The electrolytic capacitor according to claim 1, wherein the first electrolytic paper (3), the positive electrode foil (4), the second electrolytic paper (5) and the negative electrode foil (6) are strip-shaped, one ends of the positive electrode foil (4) and the positive electrode lug (7) connected are respectively higher than edges of the first electrolytic paper (3), the second electrolytic paper (5) and the negative electrode foil (6), the positive electrode lug (7) is matched with the positive electrode foil (4), one ends of the negative electrode foil (6) and the negative electrode lug (8) connected are respectively higher than edges of the first electrolytic paper (3), the second electrolytic paper (5) and the positive electrode foil (4), and the negative electrode lug (8) is matched with the negative electrode foil (6).

3. An electrolytic capacitor according to claim 2, wherein the positive tab (7) and the negative tab (8) are each zigzag-shaped.

4. An electrolytic capacitor according to claim 1, characterized in that the open end of the metal housing (1) is fixedly connected with a resistance ring (11) for limiting the metal cover (9) and the insulating ring (10).