Flat aluminum electrolytic capacitor

Abstract

The utility model discloses a flat type aluminum electrolytic capacitor, which comprises a shell, a plurality of capacitor monomers stacked in the shell, and a cover plate used for packaging the capacitor monomers in the shell, wherein each capacitor monomer comprises a positive aluminum foil sheet, a negative aluminum foil sheet, electrolytic paper arranged between the positive aluminum foil sheet and the negative aluminum foil sheet, and a coating wrapping the positive aluminum foil sheet, the negative aluminum foil sheet and the electrolytic paper; the positive aluminum foil sheet comprises a sheet-shaped positive plate and a positive lead-out port extending from the sheet-shaped positive plate; the electrolytic paper is of a sheet-shaped sandwich structure, and the sheet-shaped positive plate of the positive aluminum foil sheet is contained in the sandwich structure. The flat type aluminum electrolytic capacitor is simple in structure, free of a winding process, high in production yield, reliable in quality, convenient in subsequent maintenance and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic devices, and particularly relates to a flat aluminum electrolytic capacitor. 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 achieve 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 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 flat 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 flat aluminum electrolytic capacitor includes a housing, a plurality of capacitor monomers stacked in the housing, and a cover plate for encapsulating the capacitor monomers in the housing; wherein, the capacitor monomer includes a positive aluminum foil, a negative aluminum foil, electrolytic paper disposed between the positive aluminum foil and the negative aluminum foil, and a coating film that encapsulates the positive aluminum foil, the negative aluminum foil, and the electrolytic paper; the positive aluminum foil 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 is received in the 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 sheet-shaped sandwich structure is formed between the first planar layer and the second planar layer.

[0010] In some embodiments, the electrolytic paper is square, the sheet-shaped sandwich structure is configured to have an opening in at least one direction, and the positive aluminum foil can be inserted into the sheet-shaped sandwich structure from the opening.

[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.

[0012] In some embodiments, the surface size of the sheet-shaped sandwich structure is the same as the surface size of the positive aluminum foil, so that the positive aluminum foil can be covered by the electrolytic paper.

[0013] In some embodiments, the sheet-shaped positive electrode plate of the positive aluminum foil is rectangular, and the positive electrode lead-out port extends outward along the rectangular long side of the sheet-shaped positive electrode plate near one end of the sheet-shaped positive electrode plate.

[0014] In some embodiments, the thickness of the sheet-shaped positive electrode plate of the positive aluminum foil is less than the thickness of the positive electrode lead-out port.

[0015] In some embodiments, 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.

[0016] In some embodiments, the thickness of the first planar layer of the electrolytic paper is equal to the thickness of the second planar layer.

[0017] 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 area of the sheet-shaped positive electrode plate.

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

[0019] Compared with the prior art, the flat aluminum electrolytic capacitor of the present utility model has a simple structure, does not require a winding process, has a high production yield of capacitors, reliable quality, convenient subsequent maintenance, and a long service life of the capacitors. 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 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 three-dimensional schematic diagram of a flat aluminum electrolytic capacitor according to an embodiment of the present invention;

[0022] Figure 2 is a partial exploded schematic diagram of a flat aluminum electrolytic capacitor according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a plurality of capacitor monomers of a flat aluminum electrolytic capacitor according to an embodiment of the present invention stacked together and connected to the core terminals;

[0024] Figure 4 is Figure 3 a partial enlarged schematic diagram;

[0025] Figure 5 is a partial exploded schematic diagram of the cover part of a flat aluminum electrolytic capacitor according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a capacitor monomer of a flat aluminum electrolytic capacitor according to an embodiment of the present invention;

[0027] Figure 7 is Figure 6 an exploded schematic diagram of the capacitor monomer;

[0028] Figure 8 is Figure 6 a schematic diagram of the electrolytic paper of the capacitor monomer;

[0029] Figure 9 is Figure 8 a schematic diagram of part A in

[0030] Figure 10 is Figure 8 a schematic diagram of part B in

[0031] Figure 11 is Figure 6 a schematic diagram of the negative aluminum foil of the capacitor monomer;

[0032] Figure 12 is Figure 11 Partial schematic diagram of the negative aluminum foil

[0033] Figure 13 is Figure 6 Schematic diagram of the positive aluminum foil of the capacitor unit

[0034] Figure 14 is Figure 13 Partial enlarged schematic diagram of part C

[0035] Figure 15 is Figure 6 Partial schematic diagram of the capacitor unit without encapsulation

[0036] Figure 16 is Figure 6 Schematic diagram of the first encapsulating sheet of the capacitor unit

[0037] Figure 17 is Figure 6 Schematic diagram of the second encapsulating sheet of the capacitor unit Detailed implementation manners

[0038] 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 in conjunction with 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.

[0039] 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 a fixing function or for a circuit connection function.

[0040] 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 accompanying 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 therefore should not be construed as a limitation to the present utility model.

[0041] 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 of such features. In the description of the embodiments of the present utility model, unless otherwise clearly specified and defined, the meaning of "a plurality" is two or more. Terms such as "installed", "connected", "joined", "fixed", etc. 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 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.

[0042] Referring to Figures 1 - 8 , Figure 11 , Figure 13 , Figures 16 - 17 As shown in the figures, as an embodiment of the present utility model, a flat aluminum electrolytic capacitor 200 is provided, which includes a housing 21, a plurality of capacitor monomers 100 stacked in the housing 21, and a cover plate 22 for encapsulating the capacitor monomers 100 in the housing 21. Among them, the capacitor monomer 100 includes a positive aluminum foil 10, a negative aluminum foil 20, an electrolytic paper 30 disposed between the positive aluminum foil 10 and the negative aluminum foil 20, and a film 40 that wraps the positive aluminum foil 10, the negative aluminum foil 20, and the electrolytic paper 30. The positive aluminum foil 10 includes a sheet-shaped positive plate 101 and a positive lead-out port 102 extending from the sheet-shaped positive plate 101. The electrolytic paper 30 is arranged in a sheet-shaped sandwich structure, and the sheet-shaped positive plate 101 of the positive aluminum foil 10 is received in the sandwich structure.

[0043] Referring to Figure 3 , Figure 6 , Figure 7 As shown in the figures, specifically, the capacitor monomer 100 is sheet-shaped, and the positive aluminum foil 10 and the negative aluminum foil 20 of the capacitor monomer 100 are respectively provided with a positive lead-out port 102 and a negative lead-out port 202. A plurality of capacitor monomers 100 are stacked together, and the positive lead-out ports 102 and the negative lead-out ports 202 of the capacitor monomers 100 are respectively brought together and led out through a conducting piece 23 and connected to a positive lead-out terminal 220 and a negative lead-out terminal 221 on the cover plate 22 respectively.

[0044] Referring to Figures 3 - 7As shown, specifically, the positive electrode lead-out ports 102 of the multiple capacitor monomers 100 are gathered together through the battery cell terminals 24. The battery cell terminals 24 are directly connected to the conducting sheet 23 and are connected to the positive electrode lead-out terminal 220 through the conducting sheet 23. Correspondingly, the negative electrode lead-out ports 202 of the multiple capacitor monomers 100 are gathered together through the battery cell terminals 24. The battery cell terminals 24 are directly connected to the conducting sheet 23 and are connected to the negative electrode lead-out terminal 221 through the conducting sheet 23.

[0045] Referring to Figure 3 、 Figure 4 As shown, in some embodiments, the battery cell terminals 24 include multiple terminal pieces 240. Each terminal piece 240 is independently connected to the positive electrode lead-out port 102 or the negative electrode lead-out port 202 of one capacitor monomer 100. In some embodiments, the multiple terminal pieces 240 of the battery cell terminals 24 are independent of each other, and there are gaps between the terminal pieces 240. In some embodiments, an insulator 25 is provided between the conducting sheet 23 and the cover plate 22 to achieve insulation when the cover plate 22 is made of a metal material.

[0046] Referring to Figure 2 、 Figure 3 、 Figure 5 As shown, in some embodiments, the conducting sheet 23 includes a main body portion 230 in contact with the battery cell terminals 24 and a conducting portion 231 in contact with the positive electrode lead-out terminal 220 or the negative electrode lead-out terminal 221. In some embodiments, the main body portion 230 is provided as a sheet-like plane, and the conducting portion 231 extends by bending from the main body portion 230. The area of the conducting portion 231 is less than or equal to the area of the main body portion 230.

[0047] Referring to Figure 7 、 Figure 8 、 Figure 15 As shown, in some embodiments, the positive electrode 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. The electrolytic paper 30 is provided as a sheet-like sandwich structure. The sheet-like positive electrode plate 101 of the positive electrode aluminum foil sheet 10 is received in the sandwich structure and is covered by the electrolytic paper 30.

[0048] Referring to Figures 7 - 10 、 Figure 15As 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 10 can be inserted into the sheet-like sandwich structure from the place of 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 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.

[0049] Refer to Figure 11 、 Figure 12 、 Figure 15 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 20 together with the electrolytic paper 30.

[0050] Refer to Figures 6 - 7 、 Figure 11 、 Figure 13 、 Figure 15 As shown, the positive lead-out port 102 of the positive aluminum foil sheet 10 is integrally formed with the sheet-like positive plate 101; the negative aluminum foil sheet 20 includes a sheet-like negative plate 201 and a negative lead-out port 202 extending from the sheet-like negative plate 201, and the negative lead-out port 202 is integrally formed with the sheet-like negative plate 201; the shape of the sheet-like positive plate 101 is the same as the shape of the sheet-like negative plate 201. The envelope 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.

[0051] Refer to Figure 13 、 Figure 14As shown, the sheet-like positive electrode plate 101 of the positive electrode aluminum foil 10 is rectangular, and the positive electrode lead-out port 102 extends outward along the rectangular long strip side of the sheet-like positive electrode plate 101 near one end of the sheet-like positive electrode plate 101. In some embodiments, the length of the rectangular long strip side of the sheet-like positive electrode plate 101 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 set at any position on the periphery of the sheet-like positive electrode plate 101.

[0052] Please refer to Figure 11 , Figure 12 As shown, corresponding to the positive aluminum foil 10, the sheet-shaped negative electrode plate 201 of the negative 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 201 and extends outward along the rectangular long strip edge of the sheet-shaped negative electrode plate 201; the negative electrode lead-out port 202 is far away from the positive electrode lead-out port 102. When the positive aluminum foil 10, the electrolytic paper 30, and the negative 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 plate 201 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 may also be in various other shapes. In some embodiments, the structure of the negative electrode lead-out port 202 may be the same as or different from the structure of the positive electrode lead-out port 102.

[0053] Reference Figure 9 , Figure 10 , Figure 13 , Figure 14 As shown, in some embodiments, the thickness of the sheet-shaped positive electrode plate 101 of the positive electrode aluminum foil 10 is less 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. In some embodiments, the thickness of the first plane layer 301 of the electrolytic paper 30 is equal to the thickness of the second plane layer 302. And the thickness is equal to 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, so that the surface of the positive electrode lead-out port 102 is flush with the surface of the electrolytic paper 30.

[0054] Reference Figure 11 , Figure 12As 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 2010, and an extension portion 2012 extending outward from the bending portion 2011. In some embodiments, the sheet-shaped negative electrode plate 201 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 an opening on only 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.

[0055] Figure 16 , Figure 17 The figure shows a schematic diagram of the coating film in an embodiment of the present invention. The coating film 40 includes a first wrapping sheet 401 and a second wrapping sheet 402. Figure 11 The figure shows a schematic diagram of the first wrapping sheet. Figure 12 The figure shows a schematic diagram of the second wrapping sheet; the first wrapping sheet 401 and the second wrapping sheet 402 have the same shape. After the first wrapping sheet 401 and the second wrapping sheet 402 are surrounded together, the accommodation space is formed to accommodate the positive electrode aluminum foil sheet 10, the negative electrode aluminum foil sheet 20, and the electrolytic paper 30. Specifically, the first wrapping sheet 401 and the second wrapping sheet 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 four sides 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 coating films, and the first wrapping sheet 401 and the second wrapping sheet 402 are surrounded to form a coating film envelope, and the positive electrode aluminum foil sheet 10, the negative electrode aluminum foil sheet 20, and the electrolytic paper 30 are encapsulated in the coating 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 plane. After the two wrapping sheets are attached together, the recess forms the accommodation space.

[0056] 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 201; 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 201.

[0057] In some embodiments, the positive aluminum foil sheet 10 and the negative aluminum foil sheet 20 can be arranged 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 arranged 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 arranged in a sheet shape of their structure, as long as the positive electrode plate of the positive aluminum foil sheet 10 is consistent with the negative electrode plate of the negative aluminum foil sheet 20, and it is ensured that the edges can coincide when they overlap.

[0058] In some embodiments, the positive aluminum foil sheet 10 is configured to be formed by masking and leaving a margin on the electronic aluminum foil and then corroding it with acid and alkali solutions. Specifically, the positive aluminum foil sheet 10 starts from the corrosion stage to mask and leave a margin to corrode out the surface area, and an electrochemical reaction is carried out 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 margin, and then re-rapidly formed to achieve full-surface voltage formation. The mask can also not be removed. When making later, the mask at a specific position is removed by laser to form the positive electrode lead-out port 102 with local blanking.

[0059] The negative aluminum foil sheet 20 is configured to include a sheet-shaped negative electrode plate 201 and a negative electrode lead-out port 202. The sheet-shaped negative electrode plate 202 includes a top plate 2021 and a bottom plate 2022, and a receiving space is formed between the top plate 2021 and the bottom plate 2022.

[0060] In some embodiments, the encapsulating film is a transparent heat-resistant material.

[0061] In some embodiments, the aluminum purity of the positive aluminum foil sheet or the negative aluminum foil sheet is ≥99.9%.

[0062] It is understandable 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, they can also make several substitutions or variations to these described embodiments, and these substitution or variation methods 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 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.

[0063] In this specification, the schematic representation of the above terms does 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.

[0064] In addition, the scope of the creation 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 currently exist or will be developed later can be utilized to perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein. Therefore, the appended claims are intended to include these processes, machines, manufactures, compositions of matter, means, methods, or steps within their scope.

Claims

1. A flat aluminum electrolytic capacitor, characterized in that: It comprises a shell, a plurality of capacitor cells stacked and placed in the shell, and a cover plate for encapsulating the capacitor cells in the shell; wherein the capacitor cells comprise a positive aluminum foil, a negative aluminum foil, electrolytic paper arranged between the positive aluminum foil and the negative aluminum foil, and a film encapsulating the positive aluminum foil, the negative aluminum foil and the electrolytic paper; the positive aluminum foil comprises 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 is accommodated in the sandwich structure.

2. The flat aluminum electrolytic capacitor according to claim 1, wherein: The electrolytic paper comprises a first plane layer and a second plane layer which are parallel to each other, and the sheet-like sandwich structure is formed between the first plane layer and the second plane layer.

3. The flat aluminum electrolytic capacitor according to claim 1, wherein: The electrolytic paper is square, and the sheet-like sandwich structure is configured to have an opening in at least one direction, and the positive electrode aluminum foil can be inserted into the sheet-like sandwich structure from the opening.

4. The flat aluminum electrolytic capacitor according to claim 2, wherein: The distance between the first planar layer and the second planar layer is less than or equal to the thickness of the positive electrode aluminum foil.

5. The flat aluminum electrolytic capacitor according to claim 2, wherein: The surface size of the sheet-like sandwich structure is consistent with the surface size of the positive electrode aluminum foil, so that the positive electrode aluminum foil can be covered by the electrolytic paper.

6. The flat aluminum electrolytic capacitor according to claim 1, wherein: The sheet-shaped positive electrode plate of the positive electrode aluminum foil is rectangular, and the positive electrode lead-out port is close to one end of the sheet-shaped positive electrode plate and extends outward along the rectangular long strip edge of the sheet-shaped positive electrode plate.

7. The flat aluminum electrolytic capacitor according to claim 1, wherein: The thickness of the sheet-shaped positive electrode plate of the positive electrode aluminum foil is smaller than the thickness of the positive electrode lead-out port.

8. The flat aluminum electrolytic capacitor according to claim 1, wherein: The height difference 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 is equal.

9. The flat aluminum electrolytic capacitor according to claim 2, wherein: The thickness of the first plane layer of the electrolytic paper is equal to the thickness of the second plane layer.

10. The flat aluminum electrolytic capacitor according to claim 1, wherein: The electrolytic paper is in a rectangular shape, and the rectangular area of ​​the electrolytic paper is greater than or equal to the area of ​​the sheet-shaped positive electrode plate.

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