Rectangular aluminum electrolytic capacitor

Abstract

The utility model discloses a rectangular aluminum electrolytic capacitor, which comprises a rectangular shell, a plurality of capacitor monomers placed in the rectangular shell, and a cover plate used for packaging the capacitor monomers in the shell, wherein the cover plate is provided with an anode leading-out terminal and a cathode leading-out terminal; each capacitor monomer comprises a positive aluminum foil, a negative aluminum foil, electrolytic paper arranged between the positive aluminum foil and the negative aluminum foil, and a coating wrapping the positive aluminum foil, the negative aluminum foil and the electrolytic paper; 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, and the positive electrode aluminum foil and the electrolytic paper are placed in the accommodating space of the negative electrode aluminum foil together. The rectangular aluminum electrolytic capacitor is simple in structure, high in quality, convenient for subsequent maintenance and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of capacitors, and particularly relates to a rectangular 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 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] 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, the aluminum electrolytic capacitor is integrally installed and fixed on the circuit board by welding the positive and negative terminals to 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 rectangular 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 rectangular aluminum electrolytic capacitor includes a rectangular housing, a plurality of capacitor units placed in the rectangular housing, and a cover plate for encapsulating the capacitor units in the housing; wherein, a positive lead terminal and a negative lead terminal are installed on the cover plate; the capacitor unit includes a positive aluminum foil, a negative aluminum foil, electrolytic paper disposed between the positive aluminum foil and the negative aluminum foil, and a film for covering the positive aluminum foil, the negative aluminum foil and the electrolytic paper; the electrolytic paper is provided with a sandwich layer for placing the positive aluminum foil, the negative aluminum foil is provided with a receiving space, and the positive aluminum foil is placed in the sandwich layer of the electrolytic paper and placed in the receiving space of the negative aluminum foil together with the electrolytic paper.

[0009] In some embodiments, the positive aluminum foil and the negative aluminum foil of the capacitor unit are respectively provided with a positive lead outlet and a negative lead outlet, a plurality of capacitor units are stacked together, the positive lead outlets and the negative lead outlets of the capacitor units are respectively gathered together, and are led out and connected to the positive lead terminal and the negative lead terminal on the cover plate through a connecting piece.

[0010] In some embodiments, the positive lead outlets of the plurality of capacitor units are gathered together through a cell terminal, the cell terminal is directly connected to the connecting piece, and is connected to the positive lead terminal through the connecting piece.

[0011] In some embodiments, the negative lead outlets of the plurality of capacitor units are gathered together through a cell terminal, the cell terminal is directly connected to the connecting piece, and is connected to the negative lead terminal through the connecting piece.

[0012] In some embodiments, the positive aluminum foil includes a sheet-shaped positive plate, the electrolytic paper is arranged in a sheet-shaped sandwich structure, the sheet-shaped positive plate is received in the sandwich structure and covered by the electrolytic paper.

[0013] In some embodiments, the cell terminal includes a plurality of terminal pieces, and each terminal piece independently connects a positive lead outlet or a negative lead outlet of a capacitor unit.

[0014] In some embodiments, the plurality of terminal pieces of the cell terminal are independent of each other, and gaps are provided between the terminal pieces.

[0015] In some embodiments, 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.

[0016] In some embodiments, the negative aluminum foil is provided with a receiving space, the positive aluminum foil is placed in the sheet-shaped sandwich structure of the electrolytic paper, and is placed in the receiving space of the negative aluminum foil together with the electrolytic paper.

[0017] 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.

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

[0019] Compared with the prior art, the rectangular aluminum electrolytic capacitor of the present utility model has a simple structure, high quality, is convenient for subsequent maintenance, and has a long service life. 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 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, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a three-dimensional schematic diagram of a rectangular blade-type aluminum electrolytic capacitor according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of multiple capacitor monomers of a rectangular blade-type aluminum electrolytic capacitor according to an embodiment of the present invention stacked together;

[0023] Figure 3 is a schematic diagram of the connection between multiple capacitor monomers and the core terminals of a rectangular blade-type aluminum electrolytic capacitor according to an embodiment of the present invention;

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

[0025] Figure 5 is a partial exploded schematic diagram of a rectangular blade-type aluminum electrolytic capacitor according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a capacitor monomer of a rectangular blade-type 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 Schematic diagram of the negative aluminum foil of a single capacitor cell;

[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 a single capacitor cell;

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

[0035] Figure 15 is Figure 6 Partial schematic diagram of a single capacitor cell without a coating;

[0036] Figure 16 is Figure 6 Partial schematic diagram of the coating of a single capacitor cell;

[0037] Figure 17 is Figure 6 Schematic diagram of the first wrapping sheet of a single capacitor cell;

[0038] Figure 18 is Figure 6 Schematic diagram of the second wrapping sheet of a single capacitor cell. Specific implementation manner

[0039] 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 solution 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 of 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.

[0040] 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.

[0041] 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.

[0042] 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 "installed", "connected", "connected to", "fixed" and other terms 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.

[0043] Referring to Figures 1 - 7 As shown, as an embodiment of the present invention, a rectangular aluminum electrolytic capacitor 200 is provided, which includes a rectangular housing 21, a plurality of capacitor monomers 100 placed in the rectangular housing 21, and a cover plate 22 for encapsulating the capacitor monomers 100 in the housing 21; wherein, a positive lead terminal 220 and a negative lead terminal 221 are installed on the cover plate 22; 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 coating film 40 that wraps the positive aluminum foil 10, the negative aluminum foil 20, and the electrolytic paper 30; the electrolytic paper 30 is provided with a sandwich layer for placing the positive aluminum foil 10, the negative aluminum foil 20 is provided with a receiving space, the positive aluminum foil 10 is placed in the sandwich layer of the electrolytic paper 30 and placed in the receiving space of the negative aluminum foil 20 together with the electrolytic paper 30; the coating film 40 is wrapped on the surface of the negative aluminum foil 20.

[0044] Referring to Figures 6 - 8 、 Figure 11 、 Figure 13 、 Figures 17 - 18As shown, specifically, the capacitor unit 100 is in a sheet shape. The positive aluminum foil 10 and the negative aluminum foil 20 of the capacitor unit 100 are respectively provided with a positive lead-out port 102 and a negative lead-out port 202. A plurality of capacitor units 100 are stacked together. The positive lead-out ports 102 and the negative lead-out ports 202 of the capacitor units 100 are respectively gathered together, and are led out through a conducting piece 23 and respectively connected to the positive lead-out terminal 220 and the negative lead-out terminal 221 on the cover plate 22.

[0045] Referring to Figures 3 - 5 As shown, specifically, the positive lead-out ports 102 of the plurality of capacitor units 100 are gathered together through the cell terminal 24. The cell terminal 24 is directly connected to the conducting piece 23 and is connected to the positive lead-out terminal 220 through the conducting piece 23. Correspondingly, the negative lead-out ports 202 of the plurality of capacitor units 100 are gathered together through the cell terminal 24. The cell terminal 24 is directly connected to the conducting piece 23 and is connected to the negative lead-out terminal 221 through the conducting piece 23.

[0046] Referring to Figure 4 As shown, in some embodiments, the cell terminal 24 includes a plurality of terminal pieces 240. Each terminal piece 240 is independently connected to the positive lead-out port 102 or the negative lead-out port 202 of one capacitor unit 100. In some embodiments, the plurality of terminal pieces 240 of the cell terminal 24 are independent of each other, and there is a gap between the terminal pieces 240. In some embodiments, an insulator 25 is provided between the conducting piece 23 and the cover plate 22, and insulation is achieved through the insulator 25 when the cover plate 22 is made of a metal material.

[0047] Referring to Figure 5 As shown, in some embodiments, the conducting piece 23 includes a main body portion 230 in contact with the cell terminal 24 and a conducting portion 231 in contact with the positive lead-out terminal 220 or the negative lead-out terminal 221. In some embodiments, the main body portion 230 is set as a sheet-shaped plane, and the conducting portion 231 is bent and extended 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.

[0048] In some embodiments, the positive aluminum foil 10 includes a sheet-shaped positive electrode plate 101 and a positive lead-out port 102 extending from the sheet-shaped positive electrode plate 101. The electrolytic paper 30 is set as a sheet-shaped sandwich structure. The sheet-shaped positive electrode plate 101 of the positive aluminum foil 10 is received in the sandwich structure and is covered by the electrolytic paper 30.

[0049] Referring to Figures 6 - 10 、 Figure 15As 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.

[0050] Reference Figure 11 , Figure 12 , Figure 15 As shown, in some embodiments, the negative electrode aluminum foil 20 is provided with a containing space, 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.

[0051] Reference Figures 7 - 14 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.

[0052] Figure 13 The schematic diagram of the positive aluminum foil of an embodiment of the utility model is shown, wherein the sheet-shaped positive electrode plate 101 of the positive aluminum foil 10 is rectangular, and the positive electrode lead-out port 102 extends outward along the rectangular long strip edge 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 edge 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 edge. 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-shaped positive electrode plate 101.

[0053] Figure 11 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 10, 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 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 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 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 can 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 .

[0054] Reference 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 sheet 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 102 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 101 is flush with the surface of the electrolytic paper 30.

[0055] 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, and an extending 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, openings are provided on three sides of the accommodation space, 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 extending 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 extending portion 2012 is on the same horizontal plane as the top plate 2021. In some embodiments, the thickness of the extending portion 2012 is the same as the thickness of the top plate 2021 or the bottom plate 2022.

[0056] Referring to Figures 16 - 18 As shown, the coating film 40 includes a first wrapping sheet 401 and a second wrapping sheet 402. Figure 5 The figure shows a schematic diagram of the first wrapping sheet 401. Figure 6The figure shows 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 accommodating 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 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 sheet 401 and the second wrapping sheet 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 sheet 401 and the second wrapping sheet 402 are wrapping films, and the first wrapping sheet 401 and the second wrapping sheet 402 enclose 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 flat. After the two wrapping sheets are attached together, the recess 400 forms the accommodating space. In some embodiments, the size of the accommodating 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.

[0057] Referring to Figures 6 - 8 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 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.

[0058] 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 sheet shapes of their structures, 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 overlap when they are overlapped.

[0059] In some embodiments, the positive aluminum foil sheet is configured to be formed by masking and leaving margins on the electronic aluminum foil and then corroding it with acid and alkali solutions. Specifically, from the corrosion stage, the positive aluminum foil sheet is masked and left with 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 unchanged, and when manufacturing later, the mask at specific positions can be removed by laser to form a positive electrode lead-out port with local blanking.

[0060] The negative aluminum foil sheet is configured to include a sheet-shaped negative electrode plate and a negative electrode lead-out port. 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.

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

[0062] 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 falling within 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.

[0063] 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.

[0064] 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 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 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 rectangular aluminum electrolytic capacitor, characterized in that: The invention comprises a rectangular shell, a plurality of capacitor cells placed in the rectangular shell, and a cover plate for encapsulating the capacitor cells in the shell; wherein the cover plate is provided with a positive lead-out terminal and a negative lead-out terminal; the capacitor cells comprise a positive aluminum foil sheet, a negative aluminum foil sheet, an electrolytic paper arranged between the positive aluminum foil sheet and the negative aluminum foil sheet, and a film encapsulating the positive aluminum foil sheet, the negative aluminum foil sheet and the electrolytic paper; the electrolytic paper is provided with an interlayer for placing the positive aluminum foil sheet, the negative aluminum foil sheet is provided with an accommodating space, the positive aluminum foil sheet is placed in the interlayer of the electrolytic paper and is placed together with the electrolytic paper in the accommodating space of the negative aluminum foil sheet.

2. The rectangular aluminum electrolytic capacitor according to claim 1, characterized in that: The positive aluminum foil sheet and the negative aluminum foil sheet of the capacitor cell are respectively provided with a positive lead-out port and a negative lead-out port. A plurality of capacitor cells are stacked together, and the positive lead-out ports and the negative lead-out ports of the capacitor cells are respectively gathered together and connected to the positive lead-out terminal and the negative lead-out terminal on the cover plate through the conductive sheet.

3. The rectangular aluminum electrolytic capacitor according to claim 2, characterized in that: The positive electrode lead-out ports of the plurality of capacitor cells are brought together through the cell terminals. The cell terminals are directly connected to the conductive sheet and are connected to the positive electrode lead-out terminal through the conductive sheet.

4. The rectangular aluminum electrolytic capacitor according to claim 2, characterized in that: The negative electrode lead-out ports of the plurality of capacitor cells are brought together through the cell terminals. The cell terminals are directly connected to the conductive sheet and are connected to the negative electrode lead-out terminal through the conductive sheet.

5. The rectangular aluminum electrolytic capacitor according to claim 2, characterized in that: The positive electrode aluminum foil sheet includes a sheet-shaped positive electrode plate. The electrolytic paper is arranged in a sheet-shaped sandwich structure. The sheet-shaped positive electrode plate is accommodated in the sandwich structure and covered by the electrolytic paper.

6. The rectangular aluminum electrolytic capacitor according to claim 4, characterized in that: The cell terminal includes a plurality of terminal pieces, each of which is independently connected to a positive electrode lead-out port or a negative electrode lead-out port of a capacitor cell.

7. The rectangular aluminum electrolytic capacitor according to claim 6, characterized in that: The multiple terminal pieces of the battery cell terminal are independent of each other, and gaps are provided between the terminal pieces.

8. The rectangular aluminum electrolytic capacitor according to claim 5, characterized in that: The electrolytic paper includes a first plane layer and a second plane layer which are parallel to each other, and the sandwich structure is formed between the first plane layer and the second plane layer.

9. The rectangular aluminum electrolytic capacitor according to claim 5, characterized in that: The negative electrode aluminum foil is provided with a containing space, and the positive electrode aluminum foil is placed in the sheet-like sandwich structure of the electrolytic paper and is placed together with the electrolytic paper in the containing space of the negative electrode aluminum foil.

10. The rectangular aluminum electrolytic capacitor according to claim 8, 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 electrode aluminum foil.

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