Chip type aluminum electrolytic capacitor monomer

Abstract

The utility model discloses a chip type aluminum electrolytic capacitor monomer, which comprises an anode aluminum foil sheet, a cathode aluminum foil sheet, electrolytic paper arranged between the anode aluminum foil sheet and the cathode aluminum foil sheet, and a coating wrapping the anode aluminum foil sheet, the cathode aluminum foil sheet and the electrolytic paper. Wherein the electrolytic paper is provided with a sheet-shaped interlayer structure, and the positive electrode aluminum foil sheet is placed in the sheet-shaped interlayer structure. The sheet-type aluminum electrolytic capacitor monomer is simple in structure and high in performance and quality, and is not subjected to a winding process.

Description

Technical Field

[0001] The utility model belongs to the technical field of capacitors, and particularly relates to a single-chip aluminum electrolytic capacitor. Background Art

[0002] A capacitor is a passive device, and its main function is to charge and discharge. With the continuous improvement of capacitor performance, capacitors have been widely used in consumer electronics products, communication products, computers and peripheral products, new energy, automation control, automotive industry, optoelectronic products, high-speed railways, aviation, and military equipment.

[0003] Among various capacitors, compared with other types of capacitors, when the size is the same, the aluminum electrolytic capacitor can obtain a larger CV value per unit area than other capacitors, can store more charges, and is cheaper, so it is widely popular.

[0004] At present, an aluminum electrolytic capacitor generally consists of a core package formed by winding a positive aluminum foil, a negative aluminum foil, and electrolytic paper, a cylindrical aluminum shell, and a sealing cover plate with positive and negative terminal connection 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, it is welded to the circuit board through the positive and negative terminals, so as to integrally install and fix the aluminum electrolytic capacitor on the circuit board. However, this structure of the aluminum electrolytic capacitor is complex, and the winding process is likely to result in poor quality of the core package. Moreover, as long as one of the positive aluminum foil, negative aluminum foil, or electrolytic paper in the core package is damaged, the quality of the entire capacitor will be affected.

[0005] The disclosure of the above background art content is only used to assist in understanding the inventive concept and technical solution of the utility model, and it does not necessarily belong to the prior art of this patent application. Without clear evidence indicating that the above content was publicly available on the filing date of this patent application, the above background art should not be used to evaluate the novelty and creativity of this application. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a single-chip aluminum electrolytic capacitor to solve at least one of the problems in the above background art.

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

[0008] A single-chip aluminum electrolytic capacitor includes a positive aluminum foil sheet, a negative aluminum foil sheet, electrolytic paper disposed between the positive aluminum foil sheet and the negative aluminum foil sheet, and a film that wraps the positive aluminum foil sheet, the negative aluminum foil sheet, and the electrolytic paper; wherein, the electrolytic paper is arranged in a sheet-like sandwich structure, and the positive aluminum foil sheet is placed in the sheet-like sandwich structure.

[0009] In some embodiments, the electrolytic paper includes a first planar layer and a second planar layer that are parallel to each other, and the interlayer structure is formed between the first planar layer and the second planar layer.

[0010] In some embodiments, the sheet-like interlayer structure is configured to have openings in at least one direction.

[0011] In some embodiments, the distance between the first planar layer and the second planar layer is less than or equal to the thickness of the positive aluminum foil sheet.

[0012] In some embodiments, the electrolytic paper is square, and the sheet-like interlayer structure has openings in three directions and is closed in another direction.

[0013] In some embodiments, the surface size of the interlayer structure is the same as the surface of the positive aluminum foil sheet.

[0014] In some embodiments, the negative aluminum foil sheet is provided with a receiving space, the positive aluminum foil sheet is placed in the sheet-like interlayer structure, and the electrolytic paper and the positive aluminum foil sheet are placed together in the receiving space of the negative aluminum foil sheet.

[0015] In some embodiments, the positive aluminum foil sheet includes a sheet-like positive electrode plate and a positive electrode lead-out port extending from the sheet-like positive electrode plate.

[0016] In some embodiments, the negative aluminum foil sheet includes a sheet-like negative electrode plate and a negative electrode lead-out port extending from the sheet-like negative electrode plate.

[0017] In some embodiments, the encapsulation forms a receiving space for accommodating the positive aluminum foil sheet, the negative aluminum foil sheet, and the electrolytic paper.

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

[0019] Compared with the prior art, the single structure of the chip aluminum electrolytic capacitor of the present utility model is simple, does not go through the winding process, and has high performance and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of a single chip aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0022] Figure 2It is an exploded view of a single-chip aluminum electrolytic capacitor in an embodiment of the present utility model;

[0023] Figure 3 It is a schematic diagram of electrolytic paper of a single-chip aluminum electrolytic capacitor in an embodiment of the present utility model;

[0024] Figure 4 Is Figure 3 A schematic diagram of part A in

[0025] Figure 5 Is Figure 3 A schematic diagram of part B in

[0026] Figure 6 It is a schematic diagram of the negative aluminum foil of a single-chip aluminum electrolytic capacitor in an embodiment of the present utility model;

[0027] Figure 7 It is a partial schematic diagram of the negative aluminum foil of a single-chip aluminum electrolytic capacitor in an embodiment of the present utility model;

[0028] Figure 8 It is a partial schematic diagram of a single-chip aluminum electrolytic capacitor without encapsulation in an embodiment of the present utility model;

[0029] Figure 9 It is a schematic diagram of the first wrapping sheet of a single-chip aluminum electrolytic capacitor in an embodiment of the present utility model;

[0030] Figure 10 It is a schematic diagram of the second wrapping sheet of a single-chip aluminum electrolytic capacitor in an embodiment of the present utility model. Detailed implementation manners

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present utility model clearer and more understandable, and to enable those skilled in the art to better understand the solutions of the present utility model, the technical solutions in 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. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or 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 indirectly connected to the other element. In addition, the connection can be for fixing or for circuit connection.

[0033] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the meaning of "a plurality" is two or more. Terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside 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 invention can be understood according to specific circumstances.

[0035] Refer to Figures 1-3 , Figure 6 , Figures 9-10 As shown in

[0036] Refer to Figures 3-5 , Figure 8As shown, the electrolytic paper 30 includes a first planar layer 301 and a second planar layer 302 that are parallel to each other, and a sandwich structure is formed between the first planar layer 301 and the second planar layer 302; in some embodiments, the electrolytic paper 30 is square, and the sheet-like sandwich structure is configured to have openings in at least one direction, and the positive aluminum foil sheet 303 can be inserted into the sheet-like sandwich structure from the place of the opening 303; in some embodiments, the sheet-like sandwich structure has openings in three directions and is closed in one direction. In some embodiments, the distance between the first planar layer 301 and the second planar layer 302 is less than or equal to the thickness of the positive aluminum foil sheet 10; in some embodiments, the surface size of the sandwich structure is the same as the surface of the positive aluminum foil sheet 10, so as to ensure that the positive aluminum foil sheet 10 can be covered by the electrolytic paper 30.

[0037] Refer to Figures 6-8 As shown, in some embodiments, the negative aluminum foil sheet 20 is provided with a receiving space, the positive aluminum foil sheet 10 is placed in the sheet-like sandwich structure of the electrolytic paper 30, and is placed in the receiving space of the negative aluminum foil sheet together with the electrolytic paper.

[0038] Refer to Figure 1 、 Figure 2 、 Figure 8 As shown, the positive aluminum foil sheet 10 includes a sheet-like positive electrode plate 101 and a positive electrode lead-out port 102 extending from the sheet-like positive electrode plate 101, and the positive electrode lead-out port 102 is integrally formed with the sheet-like positive electrode plate 101; the negative aluminum foil sheet 20 includes a sheet-like negative electrode plate 201 and a negative electrode lead-out port 202 extending from the sheet-like negative electrode plate 201, and the negative electrode lead-out port 202 is integrally formed with the sheet-like negative electrode plate 201; the shape of the sheet-like positive electrode plate 101 is the same as the shape of the sheet-like negative electrode plate 201. The encapsulation 40 forms a receiving space for accommodating the positive aluminum foil sheet 10, the negative aluminum foil sheet 20 and the electrolytic paper 30, the height of the receiving space is approximately equal to the sum of the thicknesses of the positive aluminum foil sheet 10, the negative aluminum foil sheet 20 and the electrolytic paper 30, and the shape of the receiving space is approximately the same as the shape of the electrolytic paper 30.

[0039] Please refer to Figure 2 As shown, the sheet-like positive electrode plate 101 of the positive aluminum foil sheet 10 is rectangular, and the positive electrode lead-out port 102 extends outward along the rectangular long side of the sheet-like positive electrode plate near one end of the sheet-like positive electrode plate 101. In some embodiments, the length of the positive electrode lead-out port 102 occupying the rectangular long side of the sheet-like positive electrode plate 101 does not exceed one-half of the rectangular long side. In some embodiments, the positive electrode lead-out port 102 is generally in an "I" shape. It should be noted that in some other embodiments, the positive electrode lead-out port 102 can also be of various other shapes. In some embodiments, the positive electrode lead-out port can also be set at any position on the periphery of the sheet-like positive electrode plate.

[0040] Figure 6 The schematic diagram of the negative electrode aluminum foil of an embodiment of the utility model is shown. Corresponding to the positive electrode aluminum foil, the sheet-shaped negative electrode plate 201 of the negative electrode aluminum foil 20 is rectangular, and the negative electrode lead-out port 202 is close to one end of the sheet-shaped negative electrode plate and extends outward along the rectangular long strip edge of the sheet-shaped negative electrode plate; the negative electrode lead-out port 202 is far away from the positive electrode lead-out port 102. When the positive electrode aluminum foil 10, the electrolytic paper 30, and the negative electrode aluminum foil 20 are stacked together, the positive electrode lead-out port 102 and the negative electrode lead-out port 202 are respectively located at the two ends of the assembly, rather than overlapping. In some embodiments, the length of the rectangular long strip edge of the sheet-shaped negative electrode occupied by the negative electrode lead-out port 202 does not exceed one-half of the rectangular long strip edge. It should be noted that the negative electrode lead-out port 202 is roughly in the shape of an "I". In some other embodiments, the negative electrode lead-out port 202 can also be various other shapes. In some embodiments, the structure of the negative electrode lead-out port can be the same as or different from the structure of the positive electrode lead-out port.

[0041] In some embodiments, the thickness of the sheet-shaped positive electrode plate 101 of the positive electrode aluminum foil 10 is smaller than the thickness of the positive electrode lead-out port 102 , and the height difference between the upper and lower surfaces of the positive electrode lead-out port 102 and the upper and lower surfaces of the sheet-shaped positive electrode plate 101 is equal.

[0042] Reference Figure 7 , Figure 8 As shown, the negative electrode lead-out port 202 of the negative electrode aluminum foil 20 extends from the sheet-shaped negative electrode plate 201, and the negative electrode lead-out port 202 includes a connection portion 2010 connected to the sheet-shaped negative electrode plate 201, a bending portion 2011 bent upward from the connection portion, and an extension portion 2012 extending outward from the bending portion 2011. In some embodiments, the sheet-shaped negative electrode plate 202 of the negative electrode aluminum foil 20 includes a top plate 2021 and a bottom plate 2022, and the accommodating space is formed between the top plate 2021 and the bottom plate 2022; the negative electrode lead-out port extends from the top plate 2021 or the bottom plate 2022. In some embodiments, three sides of the accommodating space are provided with openings, and one side is sealed; it should be noted that in some other embodiments, the accommodating space can also be designed to have an opening on only one side. In some embodiments, the extension portion 2012 and the bottom plate 2022 are on the same horizontal plane; in some embodiments, the height of the bent portion 2011 is substantially equal to the height of the gap between the top plate 2021 and the bottom plate 2022; in some embodiments, the extension portion 2012 and the top plate 2021 are on the same horizontal plane. In some embodiments, the thickness of the extension portion 2012 is the same as the thickness of the top plate 2021 or the bottom plate 2022.

[0043] Figure 9 ,Figure 10 The figure shows a schematic diagram of the coating film of an embodiment of the present utility model. The coating film 40 includes a first wrapping piece 401 and a second wrapping piece 402. Figure 9 The figure shows a schematic diagram of the first wrapping piece. Figure 10 The figure shows a schematic diagram of the second wrapping piece; the first wrapping piece 401 and the second wrapping piece 402 have the same shape. After the first wrapping piece 401 and the second wrapping piece 402 are enclosed together, the accommodating space is formed to accommodate the positive aluminum foil 10, the negative aluminum foil 20, and the electrolytic paper 30. Specifically, the first wrapping piece 401 and the second wrapping piece 402 are provided with rectangular recesses 400, and the size of the rectangular recesses 400 is the same as the size of the electrolytic paper 30; a sealing edge 403 is formed on the outer extension of the periphery of the rectangular recess 400. The rectangular recesses 400 of the first wrapping piece 401 and the second wrapping piece 402 are combined relatively to form the accommodating space, and the sealing edges 403 on the periphery of the rectangular recess are attached together to seal the accommodating space. In some embodiments, the first wrapping piece and the second wrapping piece are coating films, and the first wrapping piece and the second wrapping piece enclose to form a coating film envelope, and the positive aluminum foil, the negative aluminum foil, and the electrolytic paper are packaged in the coating film envelope. In some embodiments, only one of the first wrapping piece and the second wrapping piece is provided with a recess, and the other wrapping piece is a plane. After the two wrapping pieces are attached together, the recess forms the accommodating space.

[0044] In some embodiments, corresponding to the positive aluminum foil 10 and the negative aluminum foil 20, the shape of the electrolytic paper 30 is substantially the same as that of the sheet-shaped positive electrode plate 101 and the sheet-shaped negative electrode plate 201; in some embodiments, the shape of the electrolytic paper is rectangular, and the rectangular area of the electrolytic paper is greater than or equal to the rectangular area of the sheet-shaped positive electrode plate or greater than or equal to the rectangular area of the sheet-shaped negative electrode plate.

[0045] In some embodiments, the positive aluminum foil 10 and the negative aluminum foil 20 can be provided in a strip shape. Corresponding to the positive aluminum foil and the negative aluminum foil, the electrolytic paper 30 and the cladding 40 are also in a strip shape. Of course, in some embodiments, the positive aluminum foil and the negative aluminum foil can also be provided in other sheet-shaped rectangles, and the positive electrode lead-out port and the negative electrode lead-out port are respectively arranged on the short sides of the rectangle. It should be noted that in some other embodiments, the positive aluminum foil and the negative aluminum foil can also be provided in a sheet shape of their structures, as long as the positive electrode plate of the positive aluminum foil and the negative electrode plate of the negative aluminum foil have the same shape and ensure that the edges can coincide when overlapping.

[0046] In some embodiments, the positive aluminum foil sheet is configured to be formed by subjecting an electronic aluminum foil to masking and leaving margins, followed by corrosion with acid and alkali solutions. Specifically, from the corrosion stage, the positive aluminum foil sheet undergoes masking and leaving margins to corrode out the surface area, and an electrochemical reaction occurs to generate a surface oxide film. After the non-masked surface of the aluminum foil is formed, the mask is removed by high-temperature baking to expose the margins, and then rapid formation is carried out again to achieve full-voltage formation on the surface. Alternatively, the mask can be left in place, and when subsequent production is carried out, the mask at specific positions is removed by laser to form a positive electrode lead-out with local blanking.

[0047] In some embodiments, the encapsulating film is a transparent heat-resistant material.

[0048] In some embodiments, the aluminum purity of the positive aluminum foil sheet or the negative aluminum foil sheet is ≥99.9%.

[0049] It can be understood that the above content is a further detailed description of the creation of the present utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the creation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the creation of the present utility model pertains, without departing from the creative concept of the present utility model, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as falling within the protection scope of this patent. In the description of this specification, the description referring to terms such as "an embodiment", "some embodiments", "preferred embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model.

[0050] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the creation of the present utility model 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 defined by the appended claims.

[0051] Moreover, the scope of the present utility model creation is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, means, methods, and steps described in the specification. Those of ordinary skill in the art will readily understand that the foregoing disclosures, processes, machines, manufactures, compositions of matter, means, methods, or steps that are currently available or will be developed later, which perform substantially the same functions or achieve substantially the same results as the corresponding embodiments described herein, can be utilized. Accordingly, the appended claims are intended to embrace such processes, machines, manufactures, compositions of matter, means, methods, or steps within their scope.

Claims

1. A single chip aluminum electrolytic capacitor, characterized in that: It includes a positive aluminum foil sheet, a negative aluminum foil sheet, an electrolytic paper disposed between the positive aluminum foil sheet and the negative aluminum foil sheet, and a wrapping film that wraps the positive aluminum foil sheet, the negative aluminum foil sheet, and the electrolytic paper therein; wherein, the electrolytic paper is arranged in a sheet-like sandwich structure, and the positive aluminum foil sheet is placed in the sheet-like sandwich structure.

2. The single-chip aluminum electrolytic capacitor according to claim 1, characterized in that: The electrolytic paper includes a first planar layer and a second planar layer that are parallel to each other, and a sandwich structure is formed between the first planar layer and the second planar layer.

3. The single-chip aluminum electrolytic capacitor according to claim 2, characterized in that: The sheet-like sandwich structure is configured to have openings in at least one direction.

4. The single-chip aluminum electrolytic capacitor according to claim 2, characterized in that: The distance between the first planar layer and the second planar layer is less than or equal to the thickness of the positive aluminum foil sheet.

5. The single-chip aluminum electrolytic capacitor according to claim 2, wherein: The electrolytic paper is square, and the sheet-like sandwich structure has openings in three directions and is closed in another direction.

6. The single-chip aluminum electrolytic capacitor as described in claim 2, characterized in that: The surface size of the sandwich structure is the same as the surface of the positive aluminum foil sheet.

7. The single-chip aluminum electrolytic capacitor as described in claim 1, wherein: The negative aluminum foil sheet is provided with a receiving space, and the positive aluminum foil sheet is placed in the sheet-like sandwich structure and is placed in the receiving space of the negative aluminum foil sheet together with the electrolytic paper.

8. The single-chip aluminum electrolytic capacitor according to claim 1, characterized in that: The positive aluminum foil sheet includes a sheet-like positive electrode plate and a positive electrode lead-out port extending from the sheet-like positive electrode plate.

9. The single-chip aluminum electrolytic capacitor according to claim 8, wherein: The negative aluminum foil sheet includes a sheet-like negative electrode plate and a negative electrode lead-out port extending from the sheet-like negative electrode plate.

10. The single-chip aluminum electrolytic capacitor monomer according to claim 9, characterized in that: The wrapping film forms a receiving space for receiving the positive aluminum foil sheet, the negative aluminum foil sheet, and the electrolytic paper.

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