Aluminum electrolytic capacitor
Through the stacked structure and guide strip lead-out design, the winding process is cancelled, and the problems of complex structure and unstable quality of aluminum electrolytic capacitors are solved, and aluminium electrolytic capacitors with high production yield and long life are achieved.
Patent Information
- Application Number
- CN202421948840.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-13
AI Technical Summary
The existing aluminum electrolytic capacitors have complex structures, and the winding process can easily lead to low core pack quality. Once the positive electrode aluminum foil, negative electrode aluminum foil or electrolytic paper are damaged, the quality of the entire capacitor will be affected.
Adopting a stacked structure, the capacitor monomer consists of a positive electrode aluminum foil sheet, a negative electrode aluminum foil sheet and electrolytic paper. The positive electrode and negative electrode outlet are drawn through the guide plate, the winding process is cancelled, and the packaging is used is used.
It achieves simple structure, high production yield, reliable quality, convenient subsequent maintenance and long capacitor life.
Smart Images
Figure CN223155829U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electronic devices, and particularly relates to an 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, 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 kind of aluminum electrolytic capacitor has a complex structure, 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 an 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] An aluminum electrolytic capacitor includes a housing, a plurality of capacitor monomers stacked in the housing, and a cover plate for encapsulating the plurality of capacitor monomers in the housing. Among them, each 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. The negative aluminum foil is provided with a receiving space for placing the positive aluminum foil, the positive aluminum foil is placed in the receiving space, and the electrolytic paper is isolated and disposed between the positive aluminum foil and the negative aluminum foil. The coating film is coated on the surface of the negative aluminum foil.
[0009] In some embodiments, the positive aluminum foil and the negative aluminum foil are respectively provided with a positive lead-out port and a negative lead-out port. A plurality of capacitor monomers are stacked together, and the positive lead-out ports and the negative lead-out ports of the capacitor monomers are respectively gathered together and led out through a connecting piece.
[0010] In some embodiments, the negative aluminum foil includes a sheet-shaped negative electrode plate, and the negative lead-out port extends from the sheet-shaped negative electrode plate.
[0011] In some embodiments, the negative 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.
[0012] In some embodiments, the sheet-shaped negative electrode plate of the negative aluminum foil includes a top plate and a bottom plate, and the receiving space is formed between the top plate and the bottom plate.
[0013] In some embodiments, the height of the bending portion is substantially equal to the gap height between the top plate and the bottom plate.
[0014] In some embodiments, the extending portion is on the same horizontal plane as the top plate; the thickness of the extending portion is the same as the thickness of the top plate or the bottom plate.
[0015] In some embodiments, the negative lead-out port extends from the top plate or the bottom plate.
[0016] In some embodiments, the sheet-shaped negative electrode plate of the negative aluminum foil is rectangular, and one end of the negative lead-out port close to the sheet-shaped negative electrode plate extends outward along the rectangular long side of the sheet-shaped negative electrode plate.
[0017] In some embodiments, the length of the rectangular long side of the sheet-shaped negative electrode plate occupied by the negative lead-out port does not exceed one-half of the rectangular long side.
[0018] The beneficial effects of the technical solution of the present utility model are:
[0019] Compared with the prior art, the 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 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 an aluminum electrolytic capacitor according to an embodiment of the present invention;
[0022] Figure 2 is a schematic diagram of multiple capacitor monomers of an 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 terminal of an 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 an aluminum electrolytic capacitor according to an embodiment of the present invention;
[0026] Figure 6 is a schematic diagram of a capacitor monomer of an aluminum electrolytic capacitor according to an embodiment of the present invention;
[0027] Figure 7 is Figure 6 a schematic diagram of the film wrapping of the capacitor monomer;
[0028] Figure 8 is Figure 6 an exploded schematic diagram of the capacitor monomer;
[0029] Figure 9 is Figure 6 a schematic diagram of the positive aluminum foil of the capacitor monomer;
[0030] Figure 10 is Figure 9 a partially enlarged schematic diagram of part A in;
[0031] Figure 11 is Figure 6 a schematic diagram of the negative aluminum foil of the capacitor monomer;
[0032] Figure 12Yes Figure 11 Partial schematic diagram of the negative electrode aluminum foil
[0033] Figure 13 Yes Figure 6 First packet sheet schematic diagram of the capacitor unit
[0034] Figure 14 Yes Figure 6 Second packet sheet schematic diagram of the capacitor unit Detailed implementation manners
[0035] 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 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 in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.
[0036] 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.
[0037] 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.
[0038] 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 of" is two or more. Terms such as "mounted", "connected", "coupled", "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.
[0039] Referring to Figures 1 - 9 As shown, as an embodiment of the present utility model, an 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 coating film 40 that wraps the positive aluminum foil 10, the negative aluminum foil 20, and the electrolytic paper 30. The negative aluminum foil 20 is provided with a receiving space for placing the positive aluminum foil 10, the positive aluminum foil 10 is placed in the receiving space, and an isolated electrolytic paper 30 is placed between the positive aluminum foil 10 and the negative aluminum foil 20.
[0040] Referring to Figures 2 - 4 、 Figure 6 As shown, specifically, the capacitor monomer 100 is in a sheet shape, 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, the positive lead-out ports 102 and the negative lead-out ports 202 of the capacitor monomers 100 are respectively gathered together, and are led out through a connecting piece 23 and respectively connected to a positive lead-out terminal 220 and a negative lead-out terminal 221 on the cover plate 22.
[0041] Referring to Figures 3 - 5As shown, specifically, the positive electrode lead-out ports 102 of multiple capacitor units 100 are gathered together through the battery cell terminals 24. The battery cell terminals 24 are directly connected to the conducting piece 23 and are connected to the positive electrode lead-out terminal 220 through the conducting piece 23. Correspondingly, the negative electrode lead-out ports 202 of multiple capacitor units 100 are gathered together through the battery cell terminals 24. The battery cell terminals 24 are directly connected to the conducting piece 23 and are connected to the negative electrode lead-out terminal 221 through the conducting piece 23.
[0042] Referring to Figure 4 、 Figure 5 As shown, in some embodiments, the battery cell terminals 24 include multiple terminal pieces 240, and each terminal piece 240 is independently connected to the positive electrode lead-out port 102 or the negative electrode lead-out port 202 of a capacitor unit 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.
[0043] Referring to Figure 5 As shown, in some embodiments, the conducting piece 23 includes a main body part 230 in contact with the battery cell terminals 24 and a conducting part 231 in contact with the positive electrode lead-out terminal 10 or the negative electrode lead-out terminal 20. In some embodiments, the main body part 230 is set as a sheet-like plane, and the conducting part 231 is bent and extended from the main body part 230. The area of the conducting part 231 is less than or equal to the area of the main body part 230.
[0044] Referring to Figures 8 - 12 As shown, the positive electrode aluminum foil 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 positive electrode lead-out port 102 is integrally formed with the sheet-like positive electrode plate 101. The negative electrode aluminum foil 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. 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 202. The encapsulation 40 forms an accommodation space for accommodating the positive electrode aluminum foil 10, the negative electrode aluminum foil 20, and the electrolytic paper 30. The height of the accommodation space is approximately equal to the thickness of the positive electrode aluminum foil 10 or the negative electrode aluminum foil 20; or, the height of the accommodation space is approximately equal to the sum of the thicknesses of the positive electrode aluminum foil, the negative electrode aluminum foil, and the electrolytic paper, and the shape of the accommodation space is approximately the same as the shape of the electrolytic paper 30.
[0045] Figure 9The diagram shows a positive electrode aluminum foil sheet 10 according to an embodiment of the present invention, wherein the sheet-shaped positive electrode plate 101 of the positive electrode aluminum foil sheet 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 near one end of the sheet-shaped positive electrode plate. In some embodiments, the length of the rectangular long strip edge of the sheet-shaped positive electrode plate 101 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 arranged at any position on the periphery of the sheet-shaped positive electrode plate 101.
[0046] Figure 11 The schematic diagram of the negative electrode aluminum foil 20 of an embodiment of the present invention is shown. Corresponding to the positive electrode aluminum foil, the sheet-shaped negative electrode plate 201 of the negative electrode aluminum foil 20 is rectangular, and the negative electrode lead-out port 202 is close to one end of the sheet-shaped negative electrode plate 201 and extends outward along the rectangular long strip edge of the sheet-shaped negative electrode plate; the negative electrode lead-out port 202 is far away from the positive electrode lead-out port 102. When the positive electrode aluminum foil 10, the electrolytic paper 30, and the negative electrode aluminum foil 20 are stacked together, the positive electrode lead-out port 102 and the negative electrode lead-out port 202 are respectively located at the two ends of the assembly, rather than overlapping. In some embodiments, the length of the rectangular long strip edge of the sheet-shaped negative electrode occupied by the negative electrode lead-out port 202 does not exceed half of the rectangular long strip edge. It should be noted that the negative electrode lead-out port is roughly in the shape of an "I". In some other embodiments, the negative electrode lead-out port can also be in various other shapes. In some embodiments, the structure of the negative electrode lead-out port can be the same as or different from the structure of the positive electrode lead-out port.
[0047] Reference Figure 9 , Figure 10 As shown, in some embodiments, the thickness of the sheet-like 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 upper and lower surfaces of the positive electrode lead-out port 102 respectively form a height difference with the upper and lower surfaces of the sheet-like positive electrode plate 101, and the height difference is set to be equal or unequal.
[0048] 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 connecting portion 2010 connected to the sheet-shaped negative electrode plate 201, a bending portion 2011 bent upward from the connecting 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 includes a top plate 2021 and a bottom plate 2022, and the accommodating space is formed between the top plate 2021 and the bottom plate; 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 accommodating space are provided with openings and one side is sealed; it should be noted that in some other embodiments, the accommodating space can also be designed to have an opening on only one side. In some embodiments, the 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.
[0049] Figure 13 , Figure 14 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 13 The figure shows a schematic diagram of the first wrapping sheet 401. Figure 14 The figure shows a schematic diagram of the second wrapping sheet 402; 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 enclosed together, the accommodating 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 extends outward around the rectangular recesses 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 recesses 400 are attached together to seal the accommodating space. In some embodiments, the first wrapping sheet 401 and the second wrapping sheet 402 are coating films, and the first wrapping sheet and the second wrapping sheet enclose 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 accommodating space.
[0050] Referring to Figure 8 as shown, corresponding to the positive aluminum foil sheet and the negative aluminum foil sheet, 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 and less than or equal to the rectangular area of the sheet-shaped negative electrode plate. Or, the rectangular area of the electrolytic paper 30 is less than or equal to the rectangular area of the sheet-shaped positive electrode plate 101 and greater than or equal to the rectangular area of the sheet-shaped negative electrode plate.
[0051] 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, such as Figure 7 , Figure 8 as shown, the positive aluminum foil sheet and the negative aluminum foil sheet 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 structures, as long as the positive electrode plate of the positive aluminum foil sheet is consistent with the negative electrode plate of the negative aluminum foil sheet, and it is ensured that the edges can coincide when they overlap. It should be noted that in some other embodiments, the positive aluminum foil sheet and the negative aluminum foil sheet can also be interchanged, that is, the accommodation space is arranged on the positive aluminum foil sheet, and the sheet-shaped negative electrode plate of the negative aluminum foil sheet is placed in the accommodation space.
[0052] In some embodiments, the aluminum purity of the positive aluminum foil sheet or the negative aluminum foil sheet ≥ 99.9%;
[0053] In some embodiments, the main solvent of the aluminum electrolytic capacitor 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 present utility model creation in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present utility model creation is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model creation belongs, without departing from the creative concept of the present utility model creation, several alternatives or modifications can be made to these described embodiments, and these alternative or modified ways should all be regarded as belonging to the protection scope of this patent. In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" etc. 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 descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may 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 present invention 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] In addition, the scope of the present invention 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 will 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. An aluminum electrolytic capacitor, characterized in that: It includes a housing, a plurality of capacitor monomers stacked in the housing, and a cover plate for encapsulating the plurality of capacitor monomers in the housing; wherein, each 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 an encapsulation film; the negative aluminum foil is provided with a receiving space for placing the positive aluminum foil, the positive aluminum foil is placed in the receiving space, and the electrolytic paper is isolatedly disposed between the positive aluminum foil and the negative aluminum foil; the encapsulation film covers the surface of the negative aluminum foil.
2. The aluminum electrolytic capacitor according to claim 1, wherein: The positive aluminum foil and the negative aluminum foil are respectively provided with a positive lead-out port and a negative lead-out port. A plurality of capacitor monomers are stacked together, and the positive lead-out ports and the negative lead-out ports of the capacitor monomers are respectively gathered together and led out through conducting pieces.
3. The aluminum electrolytic capacitor according to claim 2, wherein: The negative aluminum foil includes a sheet-shaped negative electrode plate, and the negative lead-out port extends from the sheet-shaped negative electrode plate.
4. The aluminum electrolytic capacitor according to claim 3, wherein: The negative 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.
5. The aluminum electrolytic capacitor according to claim 4, wherein: The sheet-shaped negative electrode plate of the negative aluminum foil includes a top plate and a bottom plate, and the receiving space is formed between the top plate and the bottom plate.
6. The aluminum electrolytic capacitor according to claim 5, characterized in that: The height of the bending portion is substantially equal to the gap height between the top plate and the bottom plate.
7. The aluminum electrolytic capacitor according to claim 5, characterized in that: The extending portion is on the same horizontal plane as the top plate; the thickness of the extending portion is the same as the thickness of the top plate or the bottom plate.
8. The aluminum electrolytic capacitor according to claim 5, characterized in that: The negative lead-out port extends from the top plate or the bottom plate.
9. The aluminum electrolytic capacitor according to claim 3, wherein: The sheet-shaped negative electrode plate of the negative aluminum foil is rectangular, and the end of the negative lead-out port close to the sheet-shaped negative electrode plate extends outward along the rectangular long side of the sheet-shaped negative electrode plate.
10. The aluminum electrolytic capacitor according to claim 9, characterized in that: The length of the rectangular long side of the sheet-shaped negative electrode plate occupied by the negative lead-out port does not exceed one half of the rectangular long side.