Sheet capacitor monomer

Abstract

The utility model discloses a sheet-shaped capacitor monomer, which comprises an anode aluminum foil sheet, a cathode aluminum foil sheet, electrolytic paper and a coating film, wherein the cathode aluminum foil sheet is coated with the coating film; wherein the electrolytic paper is provided with an interlayer for placing the positive electrode aluminum foil, the negative electrode aluminum foil is provided with an accommodating space, the positive electrode aluminum foil is placed in the interlayer of the electrolytic paper, the positive electrode aluminum foil and the electrolytic paper are placed in the accommodating space of the negative electrode aluminum foil, and the coating film is coated on the surface of the negative electrode aluminum foil; the cathode aluminum foil sheet comprises a sheet-shaped cathode plate and a cathode lead-out port extending from the sheet-shaped cathode plate, the sheet-shaped cathode plate comprises a top plate and a bottom plate, and the accommodating space is formed between the top plate and the bottom plate. The sheet-shaped capacitor monomer is simple in structure, low in production cost and long in service life, and does not need a winding process.

Description

Technical Field

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

[0002] A capacitor is a passive device, and its main function is charging and discharging. 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 of the same size, an aluminum electrolytic capacitor can obtain a larger CV value per unit area than other capacitors, can store more charge, and is cheaper, so it is widely popular.

[0004] Currently, 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 low 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 showing 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 chip capacitor monomer 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 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 wrapping film that wraps the negative aluminum foil sheet inside; wherein, the electrolytic paper is provided with a sandwich layer for placing the positive aluminum foil sheet, the negative aluminum foil sheet is provided with a receiving space, the positive aluminum foil sheet is placed in the sandwich layer of the electrolytic paper and placed in the receiving space of the negative aluminum foil sheet together with the electrolytic paper, and the wrapping film is wrapped on the surface of the negative aluminum foil sheet; the negative aluminum foil sheet includes a sheet-shaped negative electrode plate and a negative electrode lead-out port extending from the sheet-shaped negative electrode plate, and the sheet-shaped negative electrode plate includes a top plate and a bottom plate, and the receiving space is formed between the top plate and the bottom plate.

[0009] In one embodiment, the negative electrode lead-out port of the negative aluminum foil sheet extends from the sheet-shaped negative electrode plate, and the negative electrode lead-out port includes a connecting portion connected to the sheet-shaped negative electrode plate, a bending portion bent upward from the connecting portion, and an extending portion extending outward from the bending portion.

[0010] In one embodiment, the positive aluminum foil sheet includes a sheet-shaped positive electrode plate and a positive electrode lead-out port extending from the sheet-shaped positive electrode plate; the electrolytic paper is arranged in a sheet-shaped sandwich structure, and the sheet-shaped positive electrode plate of the positive aluminum foil sheet is received in the sandwich structure and covered by the electrolytic paper.

[0011] In one embodiment, the thickness of the sheet-shaped positive electrode plate is less than the thickness of the positive electrode lead-out port, and the height differences between the upper and lower surfaces of the positive electrode lead-out port and the upper and lower surfaces of the sheet-shaped positive electrode plate are equal.

[0012] In one embodiment, the wrapping film includes a first wrapping sheet and a second wrapping sheet, and an accommodation space for wrapping the negative aluminum foil sheet is formed after the first wrapping sheet and the second wrapping sheet are enclosed together.

[0013] In one embodiment, the extending portion is on the same horizontal plane as the bottom plate; the height of the bending portion is approximately equal to the gap height between the top plate and the bottom plate.

[0014] In one embodiment, the electrolytic paper includes a first planar layer and a second planar layer that are parallel to each other, and the sandwich structure is formed between the first planar layer and the second planar layer.

[0015] In one embodiment, the sheet-shaped sandwich structure is configured to have an opening in at least one direction, and the positive aluminum foil sheet can be inserted into the sheet-shaped sandwich structure from the opening.

[0016] In one embodiment, 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.

[0017] In the following embodiments, the thickness of the first planar layer of the electrolytic paper is equal to the thickness of the second planar layer.

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

[0019] Compared with the prior art, the single-piece capacitor of the present utility model has a simple structure, does not go through a winding process, has a low production cost and a high capacitor life. 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic diagram of a single-piece capacitor of an embodiment of the present utility model;

[0022] Figure 2 is an exploded schematic diagram of a single-piece capacitor of an embodiment of the present utility model;

[0023] Figure 3 is a schematic diagram of the electrolytic paper of a single-piece capacitor of 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 is a schematic diagram of the negative aluminum foil of a single-piece capacitor of an embodiment of the present utility model;

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

[0028] Figure 8 is a schematic diagram of the positive aluminum foil of a single-piece capacitor of an embodiment of the present utility model;

[0029] Figure 9 is Figure 8 a partially enlarged schematic diagram of part C in

[0030] Figure 10 is a partial schematic diagram of a single-piece capacitor of an embodiment of the present utility model without an encapsulation;

[0031] Figure 11 It is a schematic diagram of the first wrapping sheet of a chip capacitor monomer according to an embodiment of the present utility model;

[0032] Figure 12 It is a schematic diagram of the second wrapping sheet of a chip capacitor monomer according to an embodiment of the present utility model;

[0033] Figure 13 It is a partial schematic diagram of the film wrapping of a chip capacitor monomer according to an embodiment of the present utility model. Detailed implementation manners

[0034] 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, so that those skilled in the art can better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model 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 of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] 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.

[0036] It should be understood that the orientation or positional relationship indicated by the terms "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, and is only for the convenience of describing the embodiments of the present utility model 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, and thus cannot be understood as a limitation of the present utility model.

[0037] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the meaning of "a plurality" is two or more. Terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; 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 internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Referring to Figures 1 - 3 、 Figure 6 、 Figure 8 、 Figure 11 、 Figure 12 As shown in

[0039] The positive aluminum foil 10 includes a sheet-shaped positive electrode plate 101 and a positive electrode lead-out port 102 extending from the sheet-shaped positive electrode plate 101; the electrolytic paper 30 is arranged in a sheet-shaped sandwich structure, and the sheet-shaped positive electrode plate 101 of the positive aluminum foil 10 is received in the sandwich structure and covered by the electrolytic paper 30.

[0040] Referring to Figures 3 - 5 、 Figure 10As shown, the electrolytic paper 30 includes a first plane layer 301 and a second plane layer 302 parallel to each other, and the sandwich structure is formed between the first plane layer 301 and the second plane layer 302; in some embodiments, the electrolytic paper 30 is square, and the sheet-like sandwich structure is configured to have an opening in at least one direction, and the positive aluminum foil 10 can be inserted into the sheet-like sandwich structure from the opening; 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 plane layer 301 and the second plane layer 302 is less than or equal to the thickness of the positive aluminum foil 10; in some embodiments, the surface size of the sandwich structure is consistent with the surface of the positive aluminum foil 10, thereby ensuring that the positive aluminum foil 10 can be covered by the electrolytic paper 30.

[0041] In some embodiments, the negative electrode aluminum foil 20 is provided with a containing space, and the positive electrode aluminum foil 10 is placed in the sheet-like sandwich structure of the electrolytic paper 30 and is placed in the containing space of the negative electrode aluminum foil 20 together with the electrolytic paper 30 .

[0042] Reference Figures 8 - 10 As shown, the positive electrode lead-out port 102 of the positive electrode aluminum foil sheet 10 is integrally formed with the sheet-like positive electrode plate 101; the negative electrode 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 102 is the same as the shape of the sheet-like negative electrode plate 201. The envelope 40 is formed with a receiving space for receiving the positive electrode aluminum foil sheet 10, the negative electrode aluminum foil sheet 20 and the electrolytic paper 30, the height of the receiving space is substantially equal to the sum of the thicknesses of the positive electrode aluminum foil sheet 10, the negative electrode aluminum foil sheet 20 and the electrolytic paper 30, and the shape of the receiving space is substantially the same as the shape of the electrolytic paper 30.

[0043] Figure 8 The diagram shows a schematic diagram of a positive aluminum foil sheet according to an embodiment of the present invention, wherein the sheet-shaped 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 strip side of the sheet-shaped positive electrode plate 101 near one end of the sheet-shaped positive electrode plate 101. In some embodiments, the length of the rectangular long strip side of the sheet-shaped positive electrode plate occupied by the positive electrode lead-out port 102 does not exceed one-half of the rectangular long strip side. In some embodiments, the positive electrode lead-out port 102 is roughly in the shape of an "I". It should be noted that, in some other embodiments, the positive electrode lead-out port 102 may also be in various other shapes. In some embodiments, the positive electrode lead-out port 102 may also be arranged at any position on the periphery of the sheet-shaped positive electrode plate 101.

[0044] Figure 6The figure shows a schematic diagram of the negative aluminum foil sheet in an embodiment of the present invention. Corresponding to the positive aluminum foil sheet 10, the sheet-shaped negative electrode plate 201 of the negative aluminum foil sheet 20 is rectangular, and the negative lead-out port 202 extends outward along the rectangular long side of the sheet-shaped negative electrode plate 201 near one end of the sheet-shaped negative electrode plate 201; the negative lead-out port 202 is far from the positive lead-out port 102. When the positive aluminum foil sheet 10, the electrolytic paper 30, and the negative aluminum foil sheet 20 are stacked and combined together, the positive lead-out port 102 and the negative lead-out port 202 are respectively located at both ends of the combined body instead of overlapping. In some embodiments, the length of the rectangular long side of the sheet-shaped negative electrode plate 201 occupied by the negative lead-out port 202 does not exceed one-half of the rectangular long side. It should be noted that the negative lead-out port 202 is generally in an "I" shape. In some other embodiments, the negative lead-out port 202 can also be of various other shapes. In some embodiments, the structure of the negative lead-out port 202 and the structure of the positive lead-out port 102 can be the same or different.

[0045] Referring to Figures 8 - 10 the figure, in some embodiments, the thickness of the sheet-shaped positive electrode plate 101 of the positive aluminum foil sheet 10 is less than the thickness of the positive lead-out port 102, and the height differences between the upper and lower surfaces of the positive lead-out port 102 and the upper and lower surfaces of the sheet-shaped positive electrode plate 102 are equal. In some embodiments, the thickness of the first planar layer 301 of the electrolytic paper 30 is equal to the thickness of the second planar layer 302. And this thickness is equal to the height differences between the upper and lower surfaces of the positive lead-out port 102 and the upper and lower surfaces of the sheet-shaped positive electrode plate 101, so that the surface of the positive lead-out port 101 is flush with the surface of the electrolytic paper 30.

[0046] Referring to Figure 6 、 Figure 7As shown, the negative electrode lead-out port 202 of the negative electrode aluminum foil sheet 20 extends from the sheet-shaped negative electrode plate 201. The negative electrode lead-out port 202 includes a connection portion 2010 connected to the sheet-shaped negative electrode plate, a bending portion 2011 bent upward from the connection portion, and an extension portion 2012 extending outward from the bending portion. In some embodiments, the sheet-shaped negative electrode plate 202 of the negative electrode aluminum foil sheet 20 includes a top plate 2021 and a bottom plate 2022, and the accommodation space is formed between the top plate 2021 and the bottom plate 2022; the negative electrode lead-out port 202 extends on the top plate 2021 or the bottom plate 2022. In some embodiments, three sides of the accommodation space are provided with openings, and one side is sealed; it should be noted that in some other embodiments, the accommodation space can also be designed to have openings only on one side. In some embodiments, the extension portion 2012 is on the same horizontal plane as the bottom plate 2022; in some embodiments, the height of the bending portion 2011 is approximately equal to the gap height between the top plate 2021 and the bottom plate 2022; in some embodiments, the extension portion 2012 is on the same horizontal plane as the top plate 2021. 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.

[0047] Figures 11 - 13 As shown, the coating film 40 includes a first wrapping sheet 401 and a second wrapping sheet 402. Figure 5 The schematic diagram of the first wrapping sheet 401 is shown. Figure 6Shown is a schematic diagram of the second wrapping sheet 402; the first wrapping sheet 401 has the same shape as the second wrapping sheet 402. After the first wrapping sheet 401 and the second wrapping sheet 402 are enclosed together, the accommodation space is formed to accommodate the positive aluminum foil sheet 10, the negative aluminum foil sheet 20, and the electrolytic paper 30. Specifically, the first wrapping sheet 401 and the second wrapping sheet 402 are provided with a rectangular recess 400, and the size of the rectangular recess 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 sheet 401 and the second wrapping sheet 402 are relatively combined together to form the accommodation space, and the sealing edges 403 on the periphery of the rectangular recess are attached together to seal the accommodation space. In some embodiments, the first wrapping sheet 401 and the second wrapping sheet 402 are wrapping films, and the first wrapping sheet 401 and the second wrapping sheet 402 are enclosed to form a wrapping film envelope, and the positive aluminum foil sheet 10, the negative aluminum foil sheet 20, and the electrolytic paper 30 are encapsulated in the wrapping film envelope. In some embodiments, only one of the first wrapping sheet 401 and the second wrapping sheet 402 is provided with a recess 400, and the other wrapping sheet is a flat surface. After the two wrapping sheets are attached together, the recess 400 forms the accommodation space. In some embodiments, the size of the accommodation space of the wrapping film is adapted to the size of the sheet-shaped negative electrode plate, and the surface of the sheet-shaped negative electrode plate is closely attached to the wrapping film.

[0048] Referring to Figure 2 、 Figure 10 As shown, in some embodiments, corresponding to the positive aluminum foil sheet 10 and the negative aluminum foil sheet 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 20; in some embodiments, the shape of the electrolytic paper 30 is rectangular, and the rectangular area of the electrolytic paper 30 is greater than or equal to the rectangular area of the sheet-shaped positive electrode plate 101 or greater than or equal to the rectangular area of the sheet-shaped negative electrode plate 20.

[0049] In some embodiments, the positive aluminum foil sheet 10 and the negative aluminum foil sheet 20 can be provided in a strip shape. Corresponding to the positive aluminum foil sheet 10 and the negative aluminum foil sheet 20, the electrolytic paper 30 and the cladding 40 are also in a strip shape. Of course, in some embodiments, the positive aluminum foil sheet 10 and the negative aluminum foil sheet 20 can also be provided in other sheet-shaped rectangles, and the positive electrode lead-out port 102 and the negative electrode lead-out port 202 are respectively arranged on the short sides of the rectangle. It should be noted that in some other embodiments, the positive aluminum foil sheet 10 and the negative aluminum foil sheet 20 can also be provided in a sheet shape of their structure, as long as the positive electrode plate 101 of the positive aluminum foil sheet 10 has the same shape as the negative electrode plate of the negative aluminum foil sheet 20, and the edges can be overlapped when they are overlapped.

[0050] In some embodiments, the positive aluminum foil sheet is configured to be formed by masking the edge of the electronic aluminum foil and then corroding it with acid and alkali solutions. Specifically, the positive aluminum foil sheet starts from the corrosion stage to mask the edge and corrode the surface area, and undergoes an electrochemical reaction 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 edge, and then re-rapidly formed to achieve full-voltage formation on the surface. Alternatively, the mask can be left intact, and when manufacturing later, the mask at specific positions can be removed by laser to form a positive electrode lead-out with local blanking.

[0051] The negative aluminum foil sheet is configured to include a sheet-shaped negative electrode plate and a negative electrode lead-out. The sheet-shaped negative electrode plate includes a top plate and a bottom plate, and a receiving space is formed between the top plate and the bottom plate.

[0052] In some embodiments, the aluminum purity of the positive aluminum foil sheet or the negative aluminum foil sheet is ≥99.9%;

[0053] In some embodiments, the main solvent of the electrolyte is composed of ethylene glycol and deionized water.

[0054] 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 present utility model belongs, 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 belonging to the protection scope of this patent. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model.

[0055] 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.

[0056] Moreover, the scope of the present utility model 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 above disclosures, processes, machines, manufactures, compositions of matter, means, methods, or steps that are currently available or to be developed later can be utilized to perform substantially the same functions as the corresponding embodiments described herein or to achieve substantially the same results as the embodiments described herein. Accordingly, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, means, methods, or steps within their scope.

Claims

1. A chip capacitor unit, 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 coating film that wraps the negative aluminum foil sheet therein; wherein, the electrolytic paper is provided with a sandwich layer for placing the positive aluminum foil sheet, the negative aluminum foil sheet is provided with a receiving space, the positive aluminum foil sheet is placed in the sandwich layer of the electrolytic paper and placed in the receiving space of the negative aluminum foil sheet together with the electrolytic paper, and the coating film covers the surface of the negative aluminum foil sheet; the negative aluminum foil sheet includes a sheet-shaped negative electrode plate and a negative electrode lead-out port extending from the sheet-shaped negative electrode plate, and the sheet-shaped negative electrode plate includes a top plate and a bottom plate, and the receiving space is formed between the top plate and the bottom plate.

2. The single-chip capacitor according to claim 1, wherein: The negative electrode lead-out port of the negative aluminum foil sheet extends from the sheet-shaped negative electrode plate, and the negative electrode lead-out port includes a connecting portion connected to the sheet-shaped negative electrode plate, a bending portion bent upward from the connecting portion, and an extending portion extending outward from the bending portion.

3. The single-chip capacitor according to claim 1, characterized in that: The positive aluminum foil sheet includes a sheet-shaped positive electrode plate and a positive electrode lead-out port extending from the sheet-shaped positive electrode plate; the electrolytic paper is arranged in a sheet-shaped sandwich structure, and the sheet-shaped positive electrode plate of the positive aluminum foil sheet is received in the sandwich structure and covered by the electrolytic paper.

4. The single-chip capacitor according to claim 3, wherein: The thickness of the sheet-shaped positive electrode plate is less than the thickness of the positive electrode lead-out port, and the height differences between the upper and lower surfaces of the positive electrode lead-out port and the upper and lower surfaces of the sheet-shaped positive electrode plate are equal.

5. The single-chip capacitor according to claim 1, characterized in that: The coating film includes a first wrapping sheet and a second wrapping sheet, and an accommodation space for wrapping the negative aluminum foil sheet is formed after the first wrapping sheet and the second wrapping sheet are enclosed together.

6. The single-chip capacitor according to claim 2, wherein: The extending portion is on the same horizontal plane as the bottom plate; the height of the bending portion is approximately equal to the gap height between the top plate and the bottom plate.

7. The single-chip capacitor according to claim 3, characterized in that: The electrolytic paper includes a first planar layer and a second planar layer that are parallel to each other, and the sandwich structure is formed between the first planar layer and the second planar layer.

8. The single-chip capacitor according to claim 7, wherein: The sheet-shaped sandwich structure is configured to have an opening in at least one direction, and the positive aluminum foil sheet can be inserted into the sheet-shaped sandwich structure from the opening.

9. The single-chip capacitor according to claim 7, wherein: 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.

10. The single-chip capacitor as claimed in claim 9, wherein: The thickness of the first planar layer of the electrolytic paper is equal to the thickness of the second planar layer.

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