CN212625217U

CN212625217U - Solid electrolytic capacitor

Info

Publication number: CN212625217U
Application number: CN202021791069.8U
Authority: CN
Inventors: 杜嘉杰; 魏蓉晖
Original assignee: Dong Jia Electronics Chenzhou Co ltd
Current assignee: Dong Jia Electronics Chenzhou Co ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-02-26
Anticipated expiration: 2030-08-24

Abstract

The utility model discloses a solid electrolytic capacitor, this solid electrolytic capacitor includes: a plurality of capacitor units, a lead structure and a packaging layer. Each capacitor unit has a positive electrode part and a negative electrode part, and the positive electrode part and the negative electrode part are insulated from each other; the lead structure comprises a positive end part and a negative end part, and the plurality of capacitor units are erected on the lead structure; the packaging layer coats the plurality of capacitor units and the lead structure, and two ends of the lead structure are exposed outside the packaging layer; the positive electrode end part is step-shaped, the positive electrode part of each capacitor unit is erected on the positive electrode end part layer by layer and is electrically connected with the lead structure, and the negative electrode part of each capacitor unit is electrically connected and stacked on the negative electrode end part. Thus, the stepped arrangement of the lead structure in the solid electrolytic capacitor facilitates the stacking placement of the capacitor cells to facilitate the assembly of the solid electrolytic capacitor.

Description

Solid electrolytic capacitor

Technical Field

The present invention relates to solid electrolytic capacitors, and more particularly to a stacked solid electrolytic capacitor.

Background

Capacitors are widely used in modern electrical products, and their main applications include charge storage, ac filtering, bypassing or tuning oscillation, rotation, etc. The capacitor has different types according to different materials and applications. Various types of capacitors have different capacitor characteristics, and thus have different functions and application ranges. Among them, the solid electrolytic capacitor has the advantages of higher capacitance, smaller size and volume, superior frequency characteristics, lower manufacturing cost and the like, has wider application range, and is suitable for various types of electric appliances and electronic products.

The dielectric material of the solid electrolytic capacitor is usually a conductive polymer material. A solid electrolytic capacitor using a conductive polymer which is easy to form a solid electrolyte as a solid electrolyte, comprising a plurality of anode bodies having anode portions and a capacitor element having a cathode portion on the surface of the anode body, the cathode portion being formed with a dielectric oxide film and a cathode layer in this order.

Generally, a plurality of capacitor cells may be stacked on a planar lead structure to form a solid electrolytic capacitor having a high capacitance as a decoupling element in a power supply circuit of a Central Processing Unit (CPU). The stacked solid electrolytic capacitor includes a plurality of capacitor units and a lead structure, wherein each capacitor unit includes a positive electrode portion, a negative electrode portion, and an insulating portion electrically insulating the positive electrode portion and the negative electrode portion from each other. The positive electrode parts of the capacitor units are respectively erected at one end of the lead structure, and the negative electrode parts of the capacitor units are stacked at the other end of the lead structure and are provided with a conductor layer, so that the capacitor units are electrically connected with each other.

In the field of stacked solid electrolytic capacitors, how to quickly and stably mount each positive electrode portion of a plurality of capacitor cells on a lead structure has become one of the problems to be actively solved by those skilled in the art.

Therefore, the present invention is directed to a solid electrolytic capacitor to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a solid electrolytic capacitor, in which a lead structure is provided to facilitate the assembly of the solid electrolytic capacitor.

To achieve at least one of the advantages or other advantages, one embodiment of the present invention provides a solid electrolytic capacitor, including: a plurality of capacitor units, a lead structure and a packaging layer. Each capacitor unit has a positive electrode part and a negative electrode part, and the positive electrode part and the negative electrode part are insulated from each other; the lead structure comprises a positive end part and a negative end part, and the plurality of capacitor units are erected on the lead structure; the packaging layer coats the plurality of capacitor units and the lead structure, and two ends of the lead structure are exposed outside the packaging layer; the positive electrode end part is step-shaped, the positive electrode part of each capacitor unit is erected on the positive electrode end part layer by layer and is electrically connected with the lead structure, and the negative electrode part of each capacitor unit is electrically connected and stacked on the negative electrode end part.

In some embodiments, the positive electrode portion of each capacitor unit is electrically connected to the positive electrode end portion by conductive paste or welding.

In some embodiments, the height of each step of the step shape of the positive electrode end portion of the lead structure is the same.

In some embodiments, the negative electrode portions of the respective capacitor units are connected to each other with a conductive paste.

In some embodiments, the positive electrode portions of the respective capacitor cells are offset from one another.

In some embodiments, each of the capacitor units further includes an insulating layer, the insulating layer surrounds a circle and covers a portion of the surface of the positive electrode portion, the negative electrode portion covers a portion of the surface of the insulating layer, and the negative electrode portion includes a polymer conductive adhesive layer and a carbon adhesive layer.

In some embodiments, the number of the stepped steps of the positive electrode terminal is determined according to the number of the capacitor units.

In some embodiments, the number of steps at the positive end is between 2 and 8.

In some embodiments, the stepped step height of the positive terminal is determined according to the height of the capacitor unit.

Therefore, utilize the utility model provides a solid electrolytic capacitor, the step form setting of its lead structure is convenient for piling up of electric capacity unit and is placed to do benefit to solid electrolytic capacitor's equipment, can keep each electric capacity unit's planarization after the equipment, and then guarantee solid electrolytic capacitor's bulk characteristic.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are listed, and the detailed description is given below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It should be apparent that the drawings in the following description are only examples of the present application and are not intended to limit the embodiments of the present invention, and that other drawings can be derived from the drawings by those of ordinary skill in the art without inventive exercise. The drawings comprise:

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

FIG. 2 is a sectional perspective view of a solid electrolytic capacitor according to the present invention; and

fig. 3 is a perspective view of the middle lead structure of the present invention.

The attached drawings are marked as follows: 10-solid electrolytic capacitor 12-capacitance unit 122-positive pole part 124-negative pole part 14-lead structure 142-positive pole end 1420-connecting piece 144-negative pole end 1440-connecting piece 16-encapsulating layer 18-conductive adhesive layer H1, H2-step height

Detailed Description

Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present invention. The invention may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or component being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, the term "comprises" and any variations thereof mean "including at least".

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integrally formed connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Referring to fig. 1 and 2, fig. 1 is a perspective view of a solid electrolytic capacitor according to the present invention, and fig. 2 is a sectional perspective view of the solid electrolytic capacitor according to the present invention. To achieve at least one of the advantages or other advantages, an embodiment of the present invention provides a solid electrolytic capacitor 10, where the solid electrolytic capacitor 10 includes: a plurality of capacitive elements 12, a lead structure 14, and an encapsulation layer 16. Each capacitor unit 12 has one positive electrode portion 122 and one negative electrode portion 124, and the positive electrode portion 122 and the negative electrode portion 124 are insulated from each other. The lead structure 14 includes a positive end 142 and a negative end 144, and the plurality of capacitor units 12 are mounted on the lead structure 14. The encapsulation layer 16 encapsulates the plurality of capacitor units 12 and the lead structure 14, and two ends of the lead structure 14 are exposed outside the encapsulation layer 16. Referring to fig. 3, fig. 3 is a perspective view of the middle lead structure of the present invention. The positive end 142 of the lead structure 14 has a step-shaped connection member 1420, the positive electrode portion 122 of each capacitor unit 12 is mounted on the connection member 1420 and electrically connected to the positive end 142, the negative electrode portion 124 of each capacitor unit 12 is stacked on the connection portion 1440 of the negative end 144 of the lead structure 14, and the capacitor units 12 are electrically connected to each other.

The material of the encapsulation layer 16 may be one or more of epoxy resin, silicone rubber, polyimide, polytetrafluoroethylene, polyurethane, and liquid crystal plastic.

Referring to fig. 3 in conjunction with fig. 1 and fig. 2, in one embodiment, the lead structure 14 of the solid electrolytic capacitor 10 includes a positive terminal 142 and a negative terminal 144 for accommodating and mounting the plurality of capacitor units 12. The positive electrode end 142 and the negative electrode end 144 are disposed in opposite separated positions, and have different shapes and structures. The negative end 144 is generally "コ" shaped and has a flat connector 1440 on its top. The negative electrode portion 124 of the capacitor unit 12 has a planar shape. Thus, the negative electrode portions 124 of the plurality of capacitor units 12 are connected to each other through the conductive adhesive layer 18 and stacked on the connecting portion 1440 of the negative electrode end portion 144 of the lead structure 14 at intervals.

As shown in fig. 3, in the illustrated solid electrolytic capacitor 10, the positive electrode end 142 of the lead structure 14 has the shape of "Contraband" and has a vertically upward connecting member 1420 thereon. Further, one side of the connecting member 1420 of the positive terminal 142 is stepped to receive the positive electrode 122 of the capacitor unit 12, as shown in fig. 1 and 2.

In one embodiment, the positive electrode portion 122 of each capacitor unit 12 is electrically connected to the connecting member 1420 of the positive electrode end portion 142 by conductive adhesive or welding. In the example shown in fig. 1, the lead structure 14 is made of a metal material, and when the positive electrode portion 122 of the capacitor unit 12 is connected to the connecting member 1420 of the positive electrode end portion 142 by a conductive adhesive, the conductivity between the capacitor unit 12 and the positive electrode end portion 142 is ensured; when the positive electrode portion 122 of the capacitor unit 12 is electrically connected to the connecting member 1420 of the positive electrode end portion 142 by welding, the capacitor unit 12 can be stably and smoothly mounted on the positive electrode end portion 142, and the conductivity therebetween can be ensured.

The positive electrode portions 122 of the capacitor units 12 have different structural shapes, so that the positive electrode portions of the capacitor units 12 are staggered from each other and are mounted on the connecting member 1420 of the positive electrode end portion 142, and are further fixed on the lead structure 14. As shown in fig. 1, the solid electrolytic capacitor 10 in this example has three capacitor cells 12, the positive electrode portions 122 of the three capacitor cells 12 are mounted on the positive electrode end portion 142 so as to be shifted from each other, and the positive electrode portions 122 have different shapes. The positive electrode portion 122 of the capacitor unit 12 located at the middle in fig. 1 is T-shaped, and the positive electrode portions 122 of the capacitor units 12 located at the upper and lower layers are L-shaped and are staggered in different directions at the positive electrode end portion 142, so that the plurality of capacitor units 12 are respectively and independently arranged at different step positions of the connecting member 1420 having a step shape, and each capacitor unit 12 is stably arranged on the lead structure 14.

In one embodiment, the negative electrode portions 124 of the capacitor units 12 are connected to each other by the conductive adhesive layer 18. Referring to fig. 1 and 2 again, in the present invention, the conductive adhesive layer 18 is a conductive adhesive, such as silver adhesive, but the material of the conductive adhesive layer 18 is not limited thereto. The solid electrolytic capacitor 10 in the illustrated example has three capacitor cells 12, the negative electrode portions 124 of the three capacitor cells 12 are stacked on the connecting portion 1440 of the negative electrode end portion 144 so as to overlap each other, and the negative electrode portions 124 have substantially the same shape and structure. The negative electrode portions 124 are connected to each other by the conductive adhesive 18 and stacked, and the positive electrode portions 122 of the capacitor units 12 are staggered from each other and erected on the positive electrode end portion 142, so that the capacitor units 12 are conveniently and quickly fixed on the lead structure 14, and the capacitor units 12 can be kept horizontal and flat after being assembled, thereby ensuring the overall performance of the solid electrolytic capacitor 10.

In one embodiment, each capacitor unit 12 further includes an insulating layer (not shown). The insulating layer surrounds a circle and covers a portion of the surface of the positive electrode portion 122 of the capacitor unit 12, the negative electrode portion 124 of the capacitor unit 12 covers a portion of the surface of the insulating layer, and the negative electrode portion 124 includes a polymer conductive adhesive layer and a carbon adhesive layer. In one embodiment, the material of the conductive adhesive layer 18 is one or a combination of carbon glue and silver glue. The conductive adhesive layer 18 can be formed by coating a polymer conductive adhesive layer with a conductive adhesive layer by impregnation, screen printing, pad printing, or the like, to serve as a cathode.

In one embodiment, the number of steps of the step shape on the side of the connecting member 1420 on the positive terminal portion 142 in the lead structure 14 is determined according to the number of the capacitor cells 12. In the example shown in fig. 1, the solid electrolytic capacitor 10 has three capacitor units 12, the number of steps of the connecting member 1420 corresponds to the number of the capacitor units 12, in this example, the number of steps is 2, three stages are divided to place the three capacitor units 12, so that each capacitor unit 12 can be conveniently and quickly erected on the lead structure 14 in staggered strata.

In one embodiment, the step height of the step on the side of the connection 1420 on the positive terminal 142 of the lead structure 14 is determined according to the height of the capacitor unit 12. In the example of fig. 1 and 2, the height of the step-like step of the connecting member 1420 on the positive electrode end 142 is determined according to the height of the negative electrode portion 124 of the capacitor unit 12. The step height ensures that each capacitor is conveniently assembled on the lead structure 14 in a single layer.

In one embodiment, the number of steps of the step shape on the side of the connection member 1420 on the positive terminal portion 142 of the lead structure 14 is between 2 and 8. In the illustrated example, the number of steps of the step shape on the side of the connection member 1420 on the positive electrode end portion 142 in the lead structure 14 is 2, and correspondingly, the number of the capacitor cells 12 is 3. In practice, the number of steps in the lead structure 14 is determined comprehensively by the number of capacitor cells 12 to be used in the solid electrolytic capacitor 10, the width of the positive electrode portion 122 of each capacitor cell 12, and the like.

As shown in fig. 3, in one embodiment, the step height of the step shape on the side of the connecting member 1420 on the positive terminal portion 142 in the lead structure 14 is the same. That is, the step height H1 is equal to H2 in the illustration. In other words, in the present invention, the heights of the negative electrode portions 124 of the capacitor cells 12 included in the solid electrolytic capacitor 10 are the same, and the thicknesses of the conductive adhesive layers 18 between the negative electrode portions 124 are also the same.

In summary, the present invention provides a solid electrolytic capacitor 10, wherein the step-like structure in the lead structure 14 is convenient for stacking the capacitor units 12 one by one to facilitate the assembly of the solid electrolytic capacitor 10, and the assembled capacitor units 12 can maintain the level and smoothness of each capacitor unit 12, thereby ensuring the overall performance of the solid electrolytic capacitor 10.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make many modifications or equivalent variations by using the above disclosed method and technical contents without departing from the technical scope of the present invention, but all the simple modifications, equivalent variations and modifications made by the technical spirit of the present invention to the above embodiments are within the scope of the technical solution of the present invention.

Claims

1. A solid electrolytic capacitor, comprising:

a plurality of capacitor units, each of the capacitor units having a positive electrode portion and a negative electrode portion, the positive electrode portion and the negative electrode portion being insulated from each other;

the lead structure comprises a positive end part and a negative end part, and the plurality of capacitor units are erected on the lead structure;

the packaging layer covers the plurality of capacitor units and the lead structure, and two ends of the lead structure are exposed outside the packaging layer;

the positive end part is step-shaped, the positive part of each capacitor unit is erected on the positive end part layer by layer and is electrically connected with the lead structure, and the negative part of each capacitor unit is electrically connected and stacked on the negative end part.

2. The solid electrolytic capacitor according to claim 1, wherein each of the positive electrode portions is electrically connected to the positive electrode end portion by conductive paste or welding.

3. The solid electrolytic capacitor as claimed in claim 1 or 2, wherein the steps of the step-like shape of the positive electrode end portion of the lead structure are the same in height.

4. The solid electrolytic capacitor as claimed in claim 1, wherein the negative electrode portions of the capacitor elements are connected to each other with a conductive paste.

5. The solid electrolytic capacitor according to claim 1, wherein the positive electrode portions of the respective capacitor cells are offset from each other.

6. The solid electrolytic capacitor as claimed in claim 1, wherein each of the capacitor cells further comprises an insulating layer surrounding a portion of the surface of the positive electrode portion, the negative electrode portion covering a portion of the surface of the insulating layer, the negative electrode portion comprising a polymer conductive adhesive layer and a carbon adhesive layer.

7. The solid electrolytic capacitor as claimed in claim 1, wherein the number of the steps of the step shape of the positive electrode terminal is determined according to the number of the capacitor cells.

8. The solid electrolytic capacitor as claimed in claim 7, wherein the number of steps at the positive terminal is between 2 and 8.

9. The solid electrolytic capacitor as claimed in claim 1, wherein the stepped step height of the positive electrode terminal is determined according to the height of the capacitor cell.