Aluminum electrolytic capacitor

Abstract

The utility model provides an aluminum electrolytic capacitor, which comprises a metal shell, a core bag and a cover plate covering the metal shell, a closed space is formed by the metal shell and the cover plate, and the core bag is arranged in the closed space; the core package is connected with an electrode terminal, the cover plate is provided with a first through hole corresponding to the electrode terminal, and the electrode terminal penetrates through the first through hole and extends out of the cover plate; the aluminum electrolytic capacitor further comprises a sealing assembly arranged at the first through hole, and the sealing assembly is used for sealing the first through hole. According to the aluminum electrolytic capacitor, the metal shell used for accommodating the core package and the cover plate are connected in a sealed mode to form the sealed space, the sealing assembly is arranged at the position of the first through hole where the electrode terminal on the metal shell penetrates and extends out, the first through hole is sealed, and the sealing effect of the formed aluminum electrolytic capacitor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor. Background Art

[0002] Traditional aluminum electrolytic capacitors mostly use winding core packages, which are assembled and formed using aluminum shells, rubber plugs and other accessories after impregnation. With the miniaturization and flattening of electronic products, traditional cylindrical aluminum electrolytic capacitors have no advantages in space utilization and also restrict the miniaturization and flattening development trend of electronic products. Based on the application limitations of cylindrical aluminum electrolytic capacitors, square aluminum electrolytic capacitors have been developed on the market, which can effectively meet the miniaturization and flattening structure requirements of electronic products.

[0003] However, the cover and shell, the cover and the anode lead terminal, and the cover and the cathode lead terminal of the square aluminum electrolytic capacitor cannot be sealed by waist extrusion like traditional cylindrical capacitors. Especially when used in liquid aluminum electrolytic capacitors, the failure to achieve complete sealing will pose a safety hazard due to leakage of the electrolyte. Therefore, the sealing problem of square aluminum electrolytic capacitors has become a major problem that needs to be solved for market applications. Utility Model Content

[0004] The utility model aims to provide an aluminum electrolytic capacitor, which is used to solve the sealing problem of square aluminum electrolytic capacitors.

[0005] One embodiment of the present invention provides an aluminum electrolytic capacitor, which includes:

[0006] A metal shell, a core package and a cover plate arranged on the metal shell, wherein the metal shell and the cover plate form a closed space, and the core package is arranged in the closed space;

[0007] The core package is connected with an electrode terminal, the cover plate is provided with a first through hole corresponding to the electrode terminal, and the electrode terminal passes through the first through hole and extends out of the cover plate;

[0008] Wherein, the aluminum electrolytic capacitor further includes a sealing component arranged at the first through hole, for sealing the first through hole.

[0009] Optionally, in the aluminum electrolytic capacitor, the cover plate is made of metal material, the sealing component is in the first through hole, filled between the cover plate and the electrode terminal, and the sealing component is made of electrical isolation material.

[0010] Optionally, in the aluminum electrolytic capacitor, a limiting member is disposed on the first surface of the cover plate, one limiting member is disposed corresponding to each of the first through holes, and the limiting member is sealed and connected to the cover plate;

[0011] The stopper comprises a second through hole which is arranged coaxially with the first through hole and communicates with the first through hole, the first through hole and the second through hole constitute an accommodation space, the sealing component is arranged in the accommodation space, the electrode terminal passes through the sealing component and the stopper, and extends out from the stopper;

[0012] The first surface is a surface away from the closed space.

[0013] Optionally, in the aluminum electrolytic capacitor, a first limiting surface is formed in the second through hole, and the sealing assembly abuts against the first limiting surface; the first limiting surface is perpendicular to the axis of the electrode terminal.

[0014] Optionally, in the aluminum electrolytic capacitor, a second limiting surface parallel to the first limiting surface is formed in the first through hole;

[0015] The sealing assembly includes a main sealing body and an extrusion sheet, wherein the main sealing body is connected to the first limiting surface, and the extrusion sheet is respectively connected to the cover plate and the main sealing body at the second limiting surface, and extrudes the main sealing body in a direction perpendicular to the first limiting surface.

[0016] Optionally, in the aluminum electrolytic capacitor, the second through hole comprises a first diameter through hole and a second diameter through hole with different diameters, and the first diameter through hole connects the first through hole and the second diameter through hole;

[0017] Among them, the connecting wall surface between the inner wall of the first diameter through hole and the inner wall of the second diameter through hole forms the first limiting surface, and the connecting wall surface between the inner wall of the first diameter through hole and the inner wall of the first through hole forms the second limiting surface.

[0018] Optionally, in the aluminum electrolytic capacitor, the extrusion sheet is arranged in the first through hole on the second surface of the cover plate and abuts against the second limiting surface, a third through hole is arranged at the center of the extrusion sheet, the electrode terminal and the third through hole are coaxially penetrated through the third through hole and the accommodating space, and the main sealing body fills the space between the electrode terminal and the limiting member in the accommodating space;

[0019] The second surface is a surface facing away from the first surface.

[0020] Optionally, in the aluminum electrolytic capacitor, the main sealing body comprises a first sealing body and a second sealing body;

[0021] Wherein, the first sealing body comprises a first column connected with the second diameter through hole and a second column connected with a part of the first diameter through hole;

[0022] The second sealing body comprises a third column connected to another part of the first diameter through hole and a fourth column connected to the third through hole;

[0023] The bottom surface of the second column is in contact with the top surface of the third column, and the electrode terminal passes through the first column, the second column, the third column and the fourth column in sequence.

[0024] Optionally, in the aluminum electrolytic capacitor, at least a portion of the first column extends out of the limiting member.

[0025] Optionally, in the aluminum electrolytic capacitor, a first center hole, a second center hole and a third center hole are sequentially arranged at the center of the first sealing body from the top surface to the bottom surface of the first sealing body, the apertures of which increase sequentially and are interconnected;

[0026] Wherein, the electrode terminal includes an electrode cap, and the electrode cap includes a first part that is matched and connected with the second center hole and a second part that is matched and connected with the third center hole, and the top surface of the electrode cap abuts against the connecting wall surface between the first center hole and the second center hole, and the bottom surface of the electrode cap is arranged on the top surface of the second sealing body.

[0027] Optionally, in the aluminum electrolytic capacitor, the electrode cap further comprises a first connection end and a second connection end respectively connected to the electrode cap in one piece;

[0028] The first connection end extends upward from the top surface of the electrode cap and extends out of the first sealing body through the first center hole; the second connection end extends downward from the bottom surface of the electrode cap and passes through the second sealing body and extends out of the second sealing body.

[0029] Optionally, in the aluminum electrolytic capacitor, a diameter of the first connecting end is equal to a diameter of the second connecting end and is smaller than diameters of the first portion and the second portion.

[0030] Optionally, in the aluminum electrolytic capacitor, the main sealing body is made of elastic plastic material, and the extruded sheet is made of metal material.

[0031] Optionally, in the aluminum electrolytic capacitor, the extruded sheet and the cover plate are connected by welding.

[0032] Optionally, in the aluminum electrolytic capacitor, the shape and size of the outer surface of the limiting member are respectively the same as the shape and size of the first through hole.

[0033] Optionally, in the aluminum electrolytic capacitor, the outer surface of the electrode terminal is provided with at least one protrusion, and the main sealing body is provided with a groove that cooperates with the protrusion.

[0034] Optionally, in the aluminum electrolytic capacitor, the surface connecting the main sealing body and the stopper includes a concave curved surface portion, and the concave curved surface portion is formed by applying a squeezing force at a relative position of the outer surface of the stopper.

[0035] Optionally, in the aluminum electrolytic capacitor, the sealing assembly is formed by calcining and melting glass beads in the first through hole.

[0036] Optionally, in the aluminum electrolytic capacitor, the sealing assembly includes a sealant filled in the first through hole.

[0037] Optionally, in the aluminum electrolytic capacitor, a filling groove is provided around the first through hole on the first surface of the cover plate away from the enclosed space, the filling groove is filled with sealant, and the sealant filled in the filling groove and the sealant in the first through hole are made by the same process.

[0038] Optionally, in the aluminum electrolytic capacitor, a protrusion is provided on the outer surface of the electrode, and the protrusion is located inside the closed space;

[0039] Wherein, a blocking rubber ring is sleeved on the electrode terminal, and the blocking rubber ring is arranged between the protrusion and the cover plate.

[0040] Optionally, in the aluminum electrolytic capacitor, the sealing assembly includes a connecting cap disposed on the cover plate and protruding in a direction away from the enclosed space, the connecting cap is made of a metal material and is sealed with the cover plate, a portion of the electrode terminal extending from the cover plate is inserted into the connecting cap, and the electrode terminal and the connecting cap are connected by welding.

[0041] Optionally, in the aluminum electrolytic capacitor, the cover plate is made of metal material, and the cover plate and the connecting cap are integrally formed.

[0042] Optionally, in the aluminum electrolytic capacitor, the electrode terminal includes a cathode terminal, the cover plate is made of a metal material, and a first connection cap corresponding to the cathode terminal among the connection caps is sealed and connected to the cover plate by welding.

[0043] Optionally, in the aluminum electrolytic capacitor, the electrode terminal also includes an anode terminal, wherein a second connecting cap corresponding to the anode terminal in the connecting cap is sealed and connected to the cover plate through glass beads; or, a ceramic ring is arranged between the second connecting cap and the cover plate, and the ceramic ring and the cover plate, and the ceramic ring and the second connecting cap are sealed and connected respectively by welding.

[0044] Optionally, in the aluminum electrolytic capacitor, the core package includes an anode foil, electrolytic paper and a cathode foil, wherein the anode foil is electrically connected to two anodes, and the cathode foil is electrically connected to two cathodes; the connecting cap includes two first connecting caps corresponding to the two cathodes respectively, and two second connecting caps corresponding to the two anodes respectively.

[0045] Optionally, in the aluminum electrolytic capacitor, the cover plate includes a first sub-plate made of a metal material and a second sub-plate made of an insulating material, the electrode terminal is arranged on the first sub-plate, and the conductive foil strip arranged on the core package is electrically connected to the electrode terminal.

[0046] Optionally, in the aluminum electrolytic capacitor, the electrode terminal includes an anode terminal and a cathode terminal, wherein the cathode terminal is connected to the first sub-plate by welding, and the anode terminal is electrically isolated from the first sub-plate by glass beads.

[0047] Optionally, in the aluminum electrolytic capacitor, the electrode terminal includes an anode terminal and a cathode terminal, wherein the anode terminal is connected to the first sub-plate by welding, a ceramic ring arranged around the anode terminal is arranged in the first sub-plate, the ceramic ring is fixedly connected to the first sub-plate by welding, and the anode terminal is fixedly connected to a portion of the first sub-plate located inside the ceramic ring by welding.

[0048] Optionally, the aluminum electrolytic capacitor, wherein the core package includes an anode foil, electrolytic paper and a cathode foil, the anode foil is electrically connected to an anode conductive foil strip, and the cathode foil is electrically connected to a cathode conductive foil strip; wherein the anode conductive foil strip is electrically connected to an anode terminal among the electrode terminals, and the cathode conductive foil strip is electrically connected to a cathode terminal among the electrode terminals.

[0049] Optionally, in the aluminum electrolytic capacitor, a circuit board is provided inside the closed space and is bonded and connected to the cover plate, and the electrode terminal passes through the circuit board and extends into the first through hole.

[0050] Optionally, in the aluminum electrolytic capacitor, an insulating layer is provided between the circuit board and the cover plate.

[0051] Optionally, in the aluminum electrolytic capacitor, a safety component is provided on the circuit board.

[0052] Optionally, in the aluminum electrolytic capacitor, the cover plate is made of metal material, and the metal shell and the cover plate are connected by laser welding or parallel welding.

[0053] Optionally, in the aluminum electrolytic capacitor, the limiting member and the cover plate are connected by laser welding, or the limiting member and the cover plate are integrally formed.

[0054] Optionally, in the aluminum electrolytic capacitor, a receiving groove is provided on the first surface of the cover plate, the receiving groove is filled with sealant, the sealing assembly is located below the sealant, and the electrode terminal extends through the sealant; wherein the first surface is the surface away from the enclosed space.

[0055] Optionally, in the aluminum electrolytic capacitor, a top diameter of the accommodating groove is smaller than a bottom diameter.

[0056] The beneficial effects of the above technical solution of the utility model are as follows:

[0057] The aluminum electrolytic capacitor described in the embodiment of the utility model forms a closed space by sealingly connecting a metal shell for accommodating a core package and a cover plate, and a sealing component is provided at a first through hole through which an electrode terminal extends on the metal shell to seal the first through hole, thereby ensuring the sealing effect of the formed aluminum electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A schematic diagram showing the three-dimensional structure of an aluminum electrolytic capacitor according to one embodiment of the utility model;

[0059] Figure 2 A three-dimensional structural schematic diagram showing the first embodiment of the sealing structure in the aluminum electrolytic capacitor according to the embodiment of the utility model;

[0060] Figure 3 A schematic cross-sectional structure diagram showing a first embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0061] Figure 4 A schematic diagram showing a three-dimensional structure of a second embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0062] Figure 5 A schematic cross-sectional structure diagram showing a second embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0063] Figure 6 A schematic cross-sectional structure diagram showing a third embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0064] Figure 7 A schematic cross-sectional structure diagram showing a fourth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0065] Figure 8 A three-dimensional structural schematic diagram showing a fifth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0066] Fig. 9 A schematic cross-sectional structure diagram showing a fifth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0067] Fig.10 A schematic cross-sectional structure diagram showing a sixth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0068] Fig.11 This is a schematic diagram showing the three-dimensional structure of the cover plate in the sixth embodiment;

[0069] Fig.12 A schematic diagram showing a three-dimensional structure of a sixth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0070] Fig.13 A schematic cross-sectional structure diagram showing a seventh embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0071] Fig.14 A three-dimensional structural schematic diagram showing an eighth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0072] Fig.15 A schematic cross-sectional structure diagram showing an eighth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0073] Fig.16 A schematic diagram showing a three-dimensional structure of a ninth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0074] Fig.17 A three-dimensional structural schematic diagram showing a tenth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0075] Fig.18A schematic diagram showing a three-dimensional structure of an eleventh embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0076] Fig.19 A schematic diagram showing a three-dimensional structure of a twelfth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0077] Fig. 20 A schematic diagram showing a three-dimensional structure of a thirteenth embodiment of the sealing structure in the aluminum electrolytic capacitor according to an embodiment of the present utility model;

[0078] Fig.21 In order to illustrate the aluminum electrolytic capacitor described in the embodiment of the utility model, a three-dimensional structural schematic diagram of a circuit board is provided;

[0079] Fig. 22 In order to illustrate the aluminum electrolytic capacitor described in the embodiment of the utility model, a schematic cross-sectional structure diagram of a circuit board is provided;

[0080] Fig.23 A schematic diagram of the exploded structure of a metal shell of an aluminum electrolytic capacitor according to an embodiment of the utility model;

[0081] Fig.24 To express Fig.23 A schematic diagram of the enlarged structure of the middle area A;

[0082] Fig.25 A schematic diagram showing the exploded structure of the aluminum electrolytic capacitor according to an embodiment of the utility model;

[0083] Fig.26 A schematic diagram showing the three-dimensional structure of an aluminum electrolytic capacitor according to one embodiment of the utility model;

[0084] Fig. 27 This is one of the schematic diagrams showing the connection structure between the cover plate and the metal shell in the embodiment of the utility model;

[0085] Fig.28 To express Fig. 27 A partial enlarged view of the structure;

[0086] Fig.29 A schematic diagram showing a part of the structure of the metal shell in the embodiment of the utility model;

[0087] Fig.30 A second schematic diagram showing the connection structure between the cover plate and the metal shell in an embodiment of the utility model;

[0088] Fig.31 This is a partial structural diagram of the twelfth embodiment of the present utility model;

[0089] Fig.32 The figure is a schematic diagram showing the structure of a cover plate in one embodiment of the present invention. DETAILED DESCRIPTION

[0090] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0091] It should be specially noted that in the embodiments of the present invention, when a certain element is mentioned as being "fixed, fixed, connected or communicated with" another element, it may be directly fixed, fixed, connected or communicated with the other element, or it may be indirectly fixed, fixed, connected or communicated with the other element through other intermediate connectors.

[0092] In order to solve the sealing problem of square aluminum electrolytic capacitors, an embodiment of the utility model provides an aluminum electrolytic capacitor, which forms a closed space by sealingly connecting a metal shell for accommodating a core package and a cover plate, and arranges a sealing component at a first through hole through which an electrode terminal extends on the metal shell to seal the first through hole, thereby ensuring the sealing effect of the formed aluminum electrolytic capacitor.

[0093] like Figure 1 This is a schematic diagram of the three-dimensional structure of the aluminum electrolytic capacitor according to the first embodiment of the utility model, comprising:

[0094] A metal shell 100, a core package and a cover plate 200 covering the metal shell 100, wherein the metal shell 100 and the cover plate 200 form a closed space, and the core package is arranged in the closed space;

[0095] The core package is connected with an electrode terminal 300, and the cover plate 200 is provided with a first through hole 210 corresponding to the electrode terminal 300, and the electrode terminal 300 passes through the first through hole 210 and extends out of the cover plate 200;

[0096] The aluminum electrolytic capacitor further includes a sealing component disposed at the first through hole 210 for sealing the first through hole 210 .

[0097] In one embodiment of the present invention, the metal shell 100 is arranged to form a hexagonal space, a quadrilateral opening is provided on the top surface, and the cover plate 200 is formed in a quadrilateral and is covered on the opening to form a hexahedral or square aluminum electrolytic capacitor.

[0098] In one embodiment, optionally, the cover plate 200 is made of metal material, such as aluminum material.

[0099] The following will take a hexahedral or square aluminum electrolytic capacitor as an example to illustrate the implementation method of the embodiment of the utility model, but it should be noted that the structure and sealing method of the sealing component provided at the first through hole 210 on the cover plate 200 mentioned above, and the sealing method between the metal shell 100 and the cover plate 200 are not limited to being applied only to hexahedral or square aluminum electrolytic capacitors. When applied to cylindrical aluminum electrolytic capacitors, a good sealing effect can also be achieved. Therefore, the structure defined by the aluminum electrolytic capacitor described in the embodiment of the utility model is not limited to being applied only to hexahedral or square aluminum electrolytic capacitors.

[0100] In one embodiment, optionally, the metal shell 100 and the cover plate 200 are sealed and connected by laser welding to form a closed space.

[0101] The electrode terminal 300 mentioned in the embodiment of the present invention includes an anode terminal and a cathode terminal, wherein both the anode terminal and the cathode terminal pass through the first through hole 210 on the cover plate 200 and extend out of the cover plate 200, and optionally, the structure of the sealing component at the first through hole corresponding to the anode terminal and the cathode terminal is the same, which will not be described separately in the embodiment of the present invention, that is, the electrode terminal 300 mentioned can be either an anode terminal or a cathode terminal.

[0102] Optionally, a foil strip is provided on the core package inside the metal shell 100 , and the foil strip includes an anode foil strip and a cathode foil strip, wherein the anode foil strip is electrically connected to the anode terminal in the electrode terminal 300 , and the cathode foil strip is electrically connected to the cathode terminal on the electrode terminal 300 .

[0103] In one embodiment, optionally, the sealing component is in the first through hole 210 , filled between the cover plate 200 and the electrode terminal 300 , and the sealing component is made of an electrically isolating material.

[0104] The specific implementation of the sealing assembly in the embodiment of the utility model is described below with examples in combination with the specific implementation.

[0105] Implementation Method 1

[0106] In the first embodiment, if Figure 2 and Figure 3 As shown, optionally, the cover plate 200 is made of metal material, such as aluminum material, and a limiting member 400 is provided on the first surface 201 of the cover plate 200, and a limiting member 400 is correspondingly provided for each first through hole 210, and the limiting member 400 is sealed and connected to the cover plate 200;

[0107] The stopper 400 includes a second through hole 410 which is arranged coaxially with the first through hole 210 and communicates with the first through hole 210. The first through hole 210 and the second through hole 410 constitute an accommodating space. The sealing assembly 500 is arranged in the accommodating space. The electrode terminal 300 passes through the sealing assembly 500 and the stopper 400 and extends out of the stopper 400.

[0108] The first surface 201 is a surface away from the enclosed space.

[0109] In this embodiment, by providing the stopper 400 on the first surface 201 of the cover plate 200 , the second through hole 410 and the first through hole 210 form an accommodating space for clamping the sealing assembly 500 .

[0110] Optionally, a first limiting surface 401 is formed in the second through hole 410 , and the sealing assembly 500 abuts against the first limiting surface 401 ; the first limiting surface 401 is perpendicular to the axis of the electrode terminal 300 .

[0111] Specifically, by providing a first limiting surface 401 perpendicular to the axis of the electrode terminal 300 in the second through hole 410 , the sealing assembly 500 is pressed against the first limiting surface 401 to ensure a sealed connection between the sealing assembly 500 and the limiting member 400 .

[0112] In the embodiment of the utility model, optionally, the cover plate 200 and the limit member 400 can be connected by welding. For example, the limit member 400 can be welded to the first surface of the cover plate 200 by laser welding. Optionally, the limit member 400 and the cover plate 200 can also be integrally formed. For example, the limit member 400 can be made by stamping the cover plate 200 as an integral part.

[0113] like Figure 2 and Figure 3 As shown, in one embodiment, the shape and size of the outer surface of the limiting member 400 are respectively the same as the shape and size of the first through hole 210 on the cover plate 200 .

[0114] Optionally, the shape of the first through hole 210 on the second surface 202 of the cover plate 200 can be any one of circular, square, and elliptical shapes, and accordingly, the structural shape enclosed by the limit member 400 on the first surface 201 can correspond to the same shape as the first through hole 210, and the outer surface size is the same as the size of the first through hole 210.

[0115] In one embodiment of the present invention, optionally, Figure 2 and Figure 3 As shown, a second limiting surface 203 parallel to the first limiting surface 401 is formed in the first through hole 210;

[0116] The sealing assembly 500 includes a main sealing body 510 and an extrusion sheet 520. The main sealing body 510 is connected to the first limiting surface 401. The extrusion sheet 520 is respectively connected to the cover plate 200 and the main sealing body 510 at the second limiting surface 203, and extrudes the main sealing body 510 in a direction perpendicular to the first limiting surface 401.

[0117] In this embodiment, the cover plate 200 is squeezed in a direction perpendicular to the first limiting surface 401 by the extrusion sheet 520, so that the main sealing body 510, after being subjected to the extrusion force, presses against the first limiting surface 401 and is fixed in the accommodating space enclosed by the first through hole 210 and the second through hole 410 to ensure the sealing performance of the main sealing body 510.

[0118] In the embodiment of the utility model, optionally, the main sealing body 510 is made of elastic plastic (such as rubber) material, and the extrusion sheet 520 is made of metal material.

[0119] Optionally, the extrusion sheet 520 is connected to the cover plate 200 by welding, and the extrusion sheet 520 is fastened to the cover plate 200 to ensure the extrusion force on the main sealing body 510 after the extrusion sheet 520 is installed on the cover plate 200.

[0120] In one embodiment of the present utility model, optionally, Figure 2 and Figure 3 As shown, the limiting member 400 includes a side plate 402 and a top plate 403, wherein the side plate 402 is arranged around the first through hole 210 to form a surrounding space above the first through hole 210, and is fixedly connected to the first surface 201 of the cover plate 200, and the top plate 403 is arranged opposite to the cover plate 200, and is fixedly connected to the side plate 402.

[0121] In addition, a through hole is opened on the top plate 403. Based on this setting structure, the second through hole 410 opened on the limit member 400 includes a first diameter through hole 4101 and a second diameter through hole 4102 with different diameters. The first diameter through hole 4101 connects the first through hole 210 and the second diameter through hole 4102.

[0122] The connecting wall surface between the inner wall of the first diameter through hole 4101 and the inner wall of the second diameter through hole 4102 forms the first limiting surface 401 , and the connecting wall surface between the inner wall of the first diameter through hole 4101 and the inner wall of the first through hole 210 forms the second limiting surface 203 .

[0123] Specifically, according to Figure 3 As shown, the through hole provided on the top plate 403 is formed as a second diameter through hole 4102 , and the space surrounded by the side plate 402 is formed as a first diameter through hole 4101 .

[0124] In addition, according to Figure 2 and Figure 3 As shown, the extrusion sheet 520 is arranged in the first through hole 210 on the second surface 202 of the cover plate 200 and abuts against the second limiting surface 203. A third through hole 521 is arranged at the center of the extrusion sheet 520. The electrode terminal 300 and the third through hole 521 are coaxially penetrated by the third through hole 521 and the accommodating space. The main sealing body 510 fills the space between the electrode terminal 300 and the limiting member 400 in the accommodating space.

[0125] In the embodiment of the present invention, the second surface 202 is a surface away from the first surface 201 .

[0126] In the first embodiment, if Figure 2 and Figure 3 As shown, the electrode terminal 300 includes a stepped electrode cap 310 and a first connection end 320 and a second connection end 330 respectively connected to the electrode cap 310 in one piece.

[0127] The first connection end 320 extends upward from the top surface of the electrode cap 310 , and the second connection end 330 extends downward from the bottom surface of the electrode cap 310 . The first connection end 320 , the electrode cap 310 , and the second connection end 330 are coaxially arranged.

[0128] Specifically, the electrode cap 310 includes a first portion 311 and a second portion 312, wherein the diameter of the first portion 311 is smaller than that of the second portion 312, forming a stepped shape. The first connection end 320 is connected to the top surface of the first portion 311, and the second connection end 330 is connected to the bottom surface of the second portion 312.

[0129] In the first embodiment, optionally, the first connection end 320 , the electrode cap 310 , and the second connection end 330 are respectively formed as cylindrical structures.

[0130] Optionally, the diameter of the first connection end 320 is equal to the diameter of the second connection end 330 , and is smaller than the diameters of the first portion 311 and the second portion 312 .

[0131] In this embodiment 1, optionally, the main sealing body 510 includes a first sealing body 511 and a second sealing body 512;

[0132] The first sealing body 511 includes a first column 5111 matched with the second diameter through hole 4102 and a second column 5112 matched with a part of the first diameter through hole 4101.

[0133] The second sealing body 512 includes a third column 5121 that is connected to another part of the first diameter through hole 4101 and a fourth column 5122 that is connected to the third through hole 521.

[0134] The bottom surface of the second column 5112 is in contact with the top surface of the third column 5121 , and the electrode terminal 300 passes through the first column 5111 , the second column 5112 , the third column 5121 and the fourth column 5122 in sequence.

[0135] Specifically, Figure 2 and Figure 3 As shown, in the center of the first sealing body 511, a first center hole, a second center hole and a third center hole are sequentially arranged from the top surface to the bottom surface of the first sealing body 511, the apertures of which increase sequentially and are interconnected;

[0136] Among them, the first part 311 of the electrode cap 310 is matched and connected with the second center hole, the second part 312 is matched and connected with the third center hole, and the top surface of the electrode cap 310 is abutted against the connecting wall between the first center hole and the second center hole, and the bottom surface of the electrode cap 310 is arranged on the top surface of the second sealing body 512.

[0137] Optionally, the top surface of the electrode cap 310 and the top surface of the limiting member 400 are located in the same plane.

[0138] In this embodiment, the first connection end 320 extends out of the first sealing body 511 through the first central hole, and the second connection end 330 extends downward from the bottom surface of the electrode cap 310 and passes through the second sealing body 512 and extends out of the second sealing body 512 .

[0139] In this embodiment, optionally, at least a portion of the first column 5111 extends out of the limiting member 400 .

[0140] Optionally, the first sealing body 511 and the second sealing body 512 are made of plastic isolation material (such as rubber), the first sealing body 511 is formed as an isolation gasket, and the second sealing body 512 is formed as an extrusion gasket. Moreover, in this embodiment one, an electrode cap 310 that is matched with the main sealing body 510 is set in the middle of the electrode terminal 300, and the electrode cap 310 is set on the extrusion gasket and matched with the isolation gasket, so that the electrode cap 310 is electrically isolated from the cover plate 200.

[0141] In addition, since the extrusion sheet 520 is disposed at the bottom of the second sealing body 512 (extrusion gasket), and the extrusion sheet 520 and the cover plate 200 are connected together by welding (preferably laser welding), after the extrusion sheet 520 and the cover plate 200 are welded, the extrusion sheet 520 applies pressure (the pressure is generally 1-5Mpa) to the extrusion gasket; after the extrusion gasket is subjected to the pressure of the extrusion sheet, the extrusion gasket also applies pressure to the first sealing body 511 (isolation gasket) so that the isolation gasket presses against the stopper 400. In this way, the isolation gasket and the extrusion gasket are squeezed and sealed between the isolation gasket and the extrusion gasket and the electrode terminal 300 by the extrusion sheet 520, that is, the extrusion sheet 520 makes the extrusion gasket and the isolation gasket squeezed and fixed in the accommodation space surrounded by the first through hole and the stopper 400.

[0142] In addition, in the embodiment of the utility model, optionally, by providing a third through hole 521 on the extrusion sheet 520 and providing a protruding fourth column 5122 on the second sealing body 512 and inserting it into the third through hole 521 , effective isolation between the extrusion sheet 520 and the electrode terminal 300 can be ensured.

[0143] Implementation Method 2

[0144] In the second embodiment, the arrangement structure of the upper limit member 400 on the cover plate 200 is the same as that in the first embodiment, and will not be described again here.

[0145] In this embodiment, if Figure 4 and Figure 5 As shown, a sealing assembly 500 is arranged in the accommodation space formed by the second through hole 410 and the first through hole 210 of the stopper 400. The sealing assembly 500 includes a main sealing body 510 and an extrusion sheet 520.

[0146] Among them, the main sealing body 510 is an integrated structure, and the main sealing body 510 is connected to the first limiting surface 401 of the limiting member 400, and the extrusion sheet 520 is respectively connected to the cover plate 200 and the main sealing body 510 at the second limiting surface 203 of the first through hole 210, and extrudes the main sealing body 510 in a direction perpendicular to the first limiting surface 401.

[0147] Optionally, similar to the first embodiment, the main sealing body 510 is made of elastic plastic material, and the extrusion sheet 520 is made of metal material.

[0148] In this embodiment, the extrusion sheet 520 and the cover plate 200 are connected by welding. The fastening connection between the extrusion sheet 520 and the cover plate 200 ensures the extrusion force on the main sealing body 510 after the extrusion sheet 520 is installed on the cover plate 200.

[0149] In the second embodiment, according to Figure 4 and Figure 5 As shown, the second through hole 410 opened on the limit member 400 includes a first diameter through hole 4101 and a second diameter through hole 4102 with different diameters, and the first diameter through hole 4101 connects the first through hole 210 and the second diameter through hole 4102; wherein, the main sealing body 510 includes a first column 5111 cooperatedly connected to the second diameter through hole 4102, a second column 5112 cooperatedly connected to the first diameter through hole 4101, and a fourth column 5122 cooperatedly connected to the third through hole 521 of the extrusion sheet 520.

[0150] The first column 5111 , the second column 5112 and the fourth column 5122 are combined to form a main sealing body 510 of an integrally connected structure. In addition, the top surface of the first column 5111 and the top surface of the limiting member 400 are located in the same plane.

[0151] In this second embodiment, optionally, the electrode terminal 300 is formed as a columnar structure, and a center hole matching the electrode terminal 300 is provided at the center of the main sealing body 510. The electrode terminal 300 is inserted into the center hole from the bottom surface of the main sealing body 510 and extends from the top surface of the main sealing body 510.

[0152] In this embodiment, the main sealing body 510 is arranged in the accommodating space enclosed by the second through hole 410 on the limiting member 400 and the first through hole 210 of the cover plate 200, and the extrusion sheet 520 is arranged in the first through hole 210 at the bottom surface of the cover plate 200 and is located at the bottom of the main sealing body 510. Therefore, the sealing component including the main sealing body 510 and the extrusion sheet 520 fills the space between the limiting member 400 and the electrode terminal 300 in the accommodating space, and because the extrusion sheet 520 and the cover plate 200 are welded (preferably laser welded) and connected, the extrusion sheet 520 applies pressure (the pressure is generally 1-5Mpa) to the main sealing body 510, so that the main sealing body 510 is pressed against the first limiting surface 401 of the limiting member 400, and extrusion sealing is achieved through the main sealing body 510.

[0153] Implementation Method 3

[0154] In this embodiment, if Figure 6 As shown, the arrangement structure of the upper limit member 400 on the cover plate 200 is the same as that in the second embodiment, and will not be described again here.

[0155] In this third embodiment, as in the second embodiment, the sealing assembly 500 includes a main sealing body 510 and an extrusion sheet 520, and the arrangement structure of the main sealing body 510 and the extrusion sheet 520 in the accommodating space enclosed by the second through hole 410 on the limiting member 400 and the first through hole 210 of the cover plate 200 is the same as in the second embodiment and will not be repeated here.

[0156] Different from the second embodiment, in the third embodiment, the outer surface of the electrode terminal 300 is provided with at least one protrusion 301, and the main sealing body 510 is provided with a groove that cooperates with the protrusion 301, wherein the protrusion 301 is clamped in the groove of the main sealing body 510. In this way, the contact area between the electrode terminal 300 and the main sealing body 510 is increased through the cooperation between the protrusion 301 and the groove, so as to increase the effect of the extrusion seal, and also can achieve the effect of the installation between the electrode terminal 300 and the main sealing body 510.

[0157] Implementation Method 4

[0158] In this embodiment, if Figure 7 As shown, the arrangement structure of the upper limit member 400 on the cover plate 200 is the same as that in the second embodiment, and will not be described again here.

[0159] contrast Figure 5 and Figure 7 As shown, in the fourth embodiment, compared with the second embodiment, the surface connecting the main sealing body 510 and the limiting member 400 includes a concave curved surface portion 513, and the concave curved surface portion 513 is formed by applying an extrusion force at a relative position of the outer surface of the limiting member 400.

[0160] Using this implementation, Figure 7 As shown, the relative position of the outer surface of the limit member 400 is formed into a curved surface portion that is concave toward the center line direction of the electrode terminal 300. Accordingly, when pressure is applied to the limit member 400, the surface connecting the main sealing body 510 and the limit member 400 is deformed to form a concave curved surface portion 513.

[0161] With this embodiment, by bending and deforming the connection surface between the main sealing body 510 and the stopper 400, the contact area between the main sealing body 510 and the stopper 400 is increased, and the effect of extrusion sealing is achieved.

[0162] Implementation Method 5

[0163] In the fifth embodiment, if Figure 8 and Fig. 9 As shown, the sealing component 500 is filled in the first through hole 210 provided on the cap plate 200 , that is, in the first through hole 210 , the sealing component 500 is filled between the electrode terminal 300 and the cap plate 200 .

[0164] In this embodiment, the sealing assembly 500 is formed by calcining and melting glass beads in the first through hole 210 , so that an airtight structure is formed in the first through hole 210 , thereby sealing the first through hole 210 .

[0165] Implementation Method 6

[0166] In the sixth embodiment, if Figures 10 to 12 As shown, the first through hole 210 provided on the cover plate 200 is filled with a sealing assembly 500 .

[0167] In this embodiment, the sealing assembly 500 includes a sealant filled in the first through hole 210 , and the sealant is used to seal the first through hole 210 and achieve electrical isolation between the electrode terminal 300 and the cover plate 200 .

[0168] In the embodiment of the utility model, the sealant may be a resin glue, such as a UV-curable glue.

[0169] In this embodiment, combined with Fig.11 and Fig.12 As shown, on the first surface 201 of the cover plate 200 away from the enclosed space, a filling groove 204 is arranged around the first through hole 210, and the filling groove 204 is filled with a sealant 205, and the sealant filled in the filling groove 204 and the sealant in the first through hole 210 are made by the same process.

[0170] Thus, by adopting this embodiment, the sealing area of ​​the sealing assembly 500 is enlarged by extending the sealant for sealing the first through hole 210 to the area surrounding the first through hole 210, so as to achieve the best sealing effect.

[0171] Optionally, in this embodiment, if Fig.11 and Fig.12 As shown, on the first surface 201 of the cover plate 200 , a protruding edge 2011 is provided along the edge of the first surface 201 , and a recessed area surrounded by the edge 2011 is formed as a filling groove 204 for filling with sealant.

[0172] Optionally, the thickness of the edge 2011 can be smaller as long as it can achieve the purpose of surrounding the sealant. With this embodiment, the sealant can be filled on the entire first surface of the cover plate 200, and the filled sealant is filled into the first through hole 210 to achieve the maximum sealing area.

[0173] Optionally, the sealant may be an acrylate series UV curing sealant.

[0174] Implementation Method 7

[0175] In the seventh embodiment, if Fig.13 As shown, similar to the sixth embodiment, the sealing assembly 500 in the first through hole 210 on the cover plate 200 includes a sealant filled in the first through hole 210 , and optionally, the sealant filled in the first through hole 210 can extend to a filling groove surrounding the first through hole 210 .

[0176] In this embodiment, based on the sixth embodiment, the outer surface of the electrode terminal 300 is further provided with a protrusion 301, and the protrusion 301 is located inside the closed space;

[0177] The electrode terminal 300 is sleeved with a blocking rubber ring 600 , and the blocking rubber ring 600 is disposed between the protrusion 301 and the cover plate 200 .

[0178] In this embodiment, a protrusion 301 is provided on the electrode terminal 300, and a blocking rubber ring 600 is provided above the protrusion 301. The blocking rubber ring 600 is squeezed between the protrusion 301 and the cover plate 200. Then, a sealant is filled on the first surface 201 and the sealant is cured. In this way, under the blocking effect of the blocking rubber ring 600, the uncured sealant is prevented from penetrating into the second surface 202 of the cover plate 200.

[0179] Implementation Method 8

[0180] In the eighth embodiment, if Fig.14 and Fig.15 As shown, the sealing assembly includes a connecting cap 700 disposed on the cover plate 200 and protruding in a direction away from the enclosed space. The connecting cap 700 is made of a metal material and is sealed and connected to the cover plate 200. The portion of the electrode terminal 300 extending from the cover plate 200 is inserted into the connecting cap 700, and the electrode terminal 300 and the connecting cap 700 are connected by welding.

[0181] In the embodiment of the utility model, the cover plate 200 is made of metal material, such as aluminum material. Optionally, the cover plate 200 and the connecting cap 700 are made of one piece.

[0182] In this embodiment, the connection cap 700 is sealed and connected with the cover plate 200, and the connection cap 700 is covered on the electrode terminal 300 to achieve sealing of the first through hole 210 on the cover plate 200 through which the electrode terminal 300 is penetrated. The electrode terminal 300 penetrates the first through hole 210 and is inserted into the connection cap 700, and the electrical connection between the connection cap 700 and the electrode terminal 300 is achieved by welding the connection cap 700 and the electrode terminal 300. In this way, the conductive foil strip on the core package in the metal shell can be electrically connected to the external circuit through the electrode terminal 300 and the connection cap 700.

[0183] Optionally, the connection cap 700 and the electrode terminal 300 may be welded by laser welding or parallel welding.

[0184] It should be noted that the aluminum electrolytic capacitor described in the embodiment of the utility model is not limited to being applicable to hexahedral or square aluminum electrolytic capacitors. The following implementation example illustrates the specific implementation structure of the aluminum electrolytic capacitor described in the embodiment of the utility model applied to a cylindrical aluminum electrolytic capacitor.

[0185] Implementation Method 9

[0186] In the ninth embodiment, if Fig.16 As shown, the metal shell 100 is formed into a cylindrical structure, and the cover plate 200 is formed into a circular shape. Optionally, the metal shell 100 and the cover plate 200 are both made of aluminum material.

[0187] In this embodiment, similar to the eighth embodiment, the sealing assembly includes a connection cap 700 disposed on the cover plate 200 and protruding in a direction away from the closed space of the metal shell 100 . The connection cap 700 is made of metal material and is sealed to the cover plate 200 .

[0188] Among them, the connecting cap 700 includes a first connecting cap 701 corresponding to the cathode terminal and a second connecting cap 702 corresponding to the anode terminal. In one embodiment, optionally, the first connecting cap 701 is sealed and connected to the cover plate 200 by welding, such as by brazing. In another embodiment, optionally, the second connecting cap 702 is sealed and connected to the cover plate 200 through glass beads 703. Among them, the glass beads are melted by calcination to achieve the connection between the anode terminal and the cover plate 200. Since the electrode terminals (anode terminals and cathode terminals) and the cover plate need to be sealed, the anode terminals also need to be insulated and isolated from the cover plate. After using glass beads, the electrode terminals and the cover plate can be completely sealed, and the glass beads themselves are insulating and also play a role of insulation and isolation. This manufacturing method makes the sealing process between the electrode terminal and the cover plate simpler. In this embodiment, optionally, such as Fig.16 As shown, the core package of the metal shell 100 is connected with an electrode terminal 300, and optionally, the connection cap 700 and the electrode terminal 300 are respectively formed into a cylindrical shape. The electrode terminal includes an anode terminal and a cathode terminal, wherein the cathode terminal is correspondingly inserted in the first connection cap 701, and the anode terminal is correspondingly inserted in the second connection cap 702.

[0189] In the ninth embodiment, the arrangement and structure of the connection cap 700 on the cover plate 200 are the same as those in the eighth embodiment, and will not be described again.

[0190] Implementation Method 10

[0191] In the tenth embodiment, if Fig.17 As shown, similar to the ninth embodiment, the metal housing 100 is formed into a cylindrical structure, and the cover plate 200 is formed into a circular shape. Optionally, the metal housing 100 and the cover plate 200 are both made of aluminum. The sealing assembly includes a connection cap 700 disposed on the cover plate 200 and protruding in a direction away from the closed space of the metal housing 100. The connection cap 700 is made of a metal material and is sealed and connected to the cover plate 200.

[0192] In addition, the connection cap 700 includes a first connection cap 701 corresponding to the cathode terminal and a second connection cap 702 corresponding to the anode terminal. Optionally, the first connection cap 701 is sealed and connected to the cover plate 200 by welding, such as by brazing. In this embodiment, optionally, a ceramic ring 704 is provided between the second connection cap 702 and the cover plate 200, and the ceramic ring 704 and the cover plate 200, and the ceramic ring 704 and the second connection cap 702 are respectively sealed and connected by brazing. By using the ceramic ring 704, and the ceramic ring 704 and the cover plate 200, and the ceramic ring 704 and the second connection cap 702 are sealed and connected in the form of brazing, the sealing effect between the second connection cap 702 and the cover plate 200 is ensured.

[0193] In addition, the arrangement and structure of the connection cap 700 on the cover plate 200 are the same as those in the eighth embodiment, and will not be repeated here.

[0194] Implementation Method Eleven

[0195] In the eleventh embodiment, if Fig.18 As shown, similar to the ninth and tenth embodiments, the metal housing 100 is formed into a cylindrical structure, and the cover plate 200 is formed into a circular shape. Optionally, the metal housing 100 and the cover plate 200 are both made of aluminum. The sealing assembly includes a connection cap 700 disposed on the cover plate 200 and protruding in a direction away from the closed space of the metal housing 100. The connection cap 700 is made of a metal material and is sealed and connected to the cover plate 200.

[0196] In this embodiment, the core package includes an anode foil, electrolytic paper and a cathode foil, wherein the anode foil is electrically connected to two anodes 3001, and the cathode foil is electrically connected to two cathodes 3002; the connecting cap 700 includes two first connecting caps 701 corresponding to the two cathodes 3002, and two second connecting caps 702 corresponding to the two anodes 3001.

[0197] In one embodiment, optionally, the cathode foil is connected to the cathode 3002 by riveting or welding, and the anode foil is connected to the anode 3001 by riveting or welding. In addition, the anode 3001 and the cathode 3002 respectively include a connecting piece electrically connected to the anode foil or the cathode foil and a connecting column connected to the connecting piece, wherein the connecting column extends from the enclosed space of the metal shell 100 and is inserted into the corresponding first connecting cap 701 or the second connecting cap 702.

[0198] In one embodiment, optionally, Fig.18 As shown, the two second connection caps 702 are sealed and connected to the cover plate 200 through glass beads 703 respectively. The sealing method is the same as that in the ninth embodiment and will not be repeated here.

[0199] Another embodiment, optionally, in combination Fig.17 As shown, a ceramic ring 704 can also be set between the two second connecting caps 702 and the cover plate 200. The ceramic ring 704 and the cover plate 200, and the ceramic ring 704 and the second connecting cap 702 are respectively sealed and connected by brazing. The sealing method is the same as that in embodiment 10 and will not be repeated here.

[0200] Implementation Method Twelve

[0201] In the twelfth embodiment, the metal shell is formed into a cylindrical structure, and the cover plate is formed into a circular shape, wherein Fig.19 As shown, the cover plate 200 includes a first sub-plate 2001 made of a metal material and a second sub-plate 2002 made of an insulating material, wherein the second sub-plate 2002 is arranged on a side closer to the metal shell (not shown in the figure) than the first sub-plate 2001, that is, the second sub-plate 2002 is located between the first sub-plate 2001 and the metal shell. In one embodiment, the first sub-plate 2001 is made of aluminum material.

[0202] The second sub-board 2002 is provided with a first through hole (not shown in the figure), the first sub-board 2001 is provided with an electrode terminal 300 , and the foil conductive strip disposed inside the metal shell is electrically connected to the electrode terminal 300 .

[0203] Optionally, the electrode terminal 300 is formed as a structure of an electrode terminal of a horn type capacitor, such as Fig.31 As shown, it includes a horn part 3005 and a connecting part 3006 . Optionally, the horn part 3005 and the connecting part 3006 can be an integral structure, and a pin 3007 is passed through the connecting part 3006 to pass through the cover plate 200 .

[0204] The electrode terminal 300 includes an anode terminal 3003 and a cathode terminal 3004. The cathode terminal 3004 is connected to the first sub-plate 2001 by welding, such as brazing, and the anode terminal 3003 is electrically isolated from the first sub-plate 2001 by glass beads 703. Fig.31 As shown, inside the cover plate 200 , the glass beads 703 isolate the pins 3007 from the cover plate 200 (including the first sub-plate) to achieve isolation and sealing between the cover plate 200 and the anode terminal 3003 .

[0205] In this embodiment, the anode terminal and the cathode terminal are pre-sealed and connected to the first sub-plate, and the second sub-plate is arranged at the lower part of the first sub-plate. After sealing, the anode terminal and the cathode terminal extend out of the second sub-plate and are respectively connected to the anode foil strip and the cathode foil strip.

[0206] In this embodiment, optionally, the core package includes an anode foil, electrolytic paper and a cathode foil, wherein the anode foil is electrically connected (such as by riveting or welding) to an anode foil strip, and the cathode foil is electrically connected (such as by riveting or welding) to a cathode foil strip, the anode foil strip is electrically connected to the anode terminal 3003, and the cathode foil strip is electrically connected to the cathode terminal 3004.

[0207] According to this embodiment, the anode terminal and the cathode terminal are sealedly connected to the first sub-plate made of aluminum material, and the whole is covered on the second sub-plate, so as to achieve sealing of the first through hole on the second sub-plate.

[0208] Implementation Method Thirteen

[0209] In the thirteenth embodiment, similar to the twelfth embodiment, the metal shell is formed into a cylindrical structure, and the cover plate is formed into a circular shape, wherein Fig. 20 As shown, the cover plate 200 includes a first sub-plate 2001 made of metal material and a second sub-plate 2002 made of insulating material, wherein the second sub-plate 2002 is arranged on a side closer to the metal shell (not shown) than the first sub-plate 2001. In one embodiment, the first sub-plate 2001 is made of aluminum material.

[0210] In this embodiment, the electrode terminal 300 includes an anode terminal 3003 and a cathode terminal 3004, the cathode terminal 3004 is connected to the first sub-plate 2001 by welding, such as by brazing, the anode terminal 3003 is connected to the first sub-plate 2001 by welding (such as by brazing), a ceramic ring 704 is arranged around the anode terminal 3003 in the first sub-plate 2001, the ceramic ring 7004 is fixedly connected to the first sub-plate 2001 by welding (such as by brazing), and the anode terminal 3003 is fixedly connected to the part of the first sub-plate 2001 located inside the ceramic ring 704 by welding (such as by brazing).

[0211] In this embodiment, a ceramic ring 704 is provided around the anode terminal 3003 to achieve isolation of the anode terminal 3003 and the first sub-plate 200, and brazing is used on both the inner and outer sides of the ceramic ring 704 to achieve a sealed connection between the ceramic ring 704 and the first sub-plate 200, and the first sub-plate 200 located on the inner side of the ceramic ring 704 is sealedly connected to the anode terminal 300 by brazing.

[0212] In the above-mentioned ninth to thirteenth embodiments, the sealing components between the electrode terminals and the cover plate are illustrated by taking a cylindrical capacitor as an example. However, it should be noted that the sealing components in these embodiments are not limited to being applicable only to cylindrical capacitors, but can also be applied to hexahedral or square aluminum electrolytic capacitors. Each embodiment is not illustrated separately here.

[0213] like Fig.32 The structure diagram of the cover plate 200 in one embodiment of the utility model is shown. In this embodiment, a receiving groove is provided on the first surface 201 (the first surface is the surface away from the closed space of the capacitor) of the cover plate 200, and the receiving groove is filled with a sealant 2012. The sealing component 500 is located below the sealant 2012, and the sealant 2012 is placed above the sealing component 500 to cover the sealing component 500 for further sealing. In addition, the electrode terminal 300 passes through the sealant 2012 and extends out of the cover plate 200.

[0214] Optionally, the top diameter of the receiving groove is smaller than the bottom diameter, wherein the top surface of the receiving groove is located on the first surface 201, and the bottom surface of the receiving groove is located inside the cover plate 200. With this arrangement, the inner wall surface of the receiving groove is formed as an inclined surface to ensure that the sealant 2012 is firmly fixed in the receiving groove. In addition, with this embodiment, by filling the sealant 2012 above the sealing component 500, when the cover plate 200 is deformed by heat or pressure, the sealant 2012 can press the sealing component 500 in the direction of the sealing component 500 to ensure the sealing effect of the sealing component 500.

[0215] It should be noted that in the implementation structure of the cover plate 200 provided in this embodiment, the setting structure of the sealing component 500 can be applicable to the sealing component of any embodiment of the above-mentioned embodiment one to embodiment thirteen, and the specific implementation of the sealing component 500 in this embodiment will not be repeated here.

[0216] In the aluminum electrolytic capacitor described in the embodiment of the utility model, in the above-mentioned embodiments 1 to 13, a circuit board is arranged inside the closed space formed by the metal shell and the cover plate, and the electrode terminal is passed through the circuit board and extends into the first through hole; optionally, an insulating layer is arranged between the circuit board and the cover plate. Optionally, the circuit board is connected to the cover plate in a fitting manner, or is arranged at a distance from the cover plate, that is, the circuit board is arranged on the inner side of the cover plate, ensuring that it does not affect the power supply of the circuit board. Optionally, a safety member is arranged on the circuit board to provide safety protection for the core package in the closed space.

[0217] Taking implementation mode 1 as an example, Fig.21 and Fig. 22 As shown, a circuit board 800 is disposed on the inner side of the cover plate 200 , and the electrode terminal 300 passes through the circuit board 800 and extends into the first through hole, and then passes through the limiting member 400 and extends out of the limiting member 400 .

[0218] An insulating layer 900 is provided between the circuit board 800 and the cover plate 200, and the insulating layer 900 is used to achieve electrical isolation between the circuit board 800 and the cover plate 200. Optionally, the insulating layer 900 may be an insulating plastic sheet or an insulating resin layer.

[0219] In the embodiment of the utility model, a safety component is provided on the circuit board 800. Optionally, the safety component includes a safety switch and / or a fuse.

[0220] In one embodiment, the safety element optionally includes a safety switch. When a high voltage impact occurs between the anode terminal and the cathode terminal, the safety switch on the circuit board 800 can be opened to short-circuit the anode terminal and the cathode terminal, thereby ensuring that the core package in the metal shell is not impacted by a large current.

[0221] In another embodiment, optionally, the safety element includes a fuse. When a high voltage impact occurs between the anode terminal and the cathode terminal, the fuse breaks, thereby disconnecting the anode terminal and the core package, thereby ensuring that the core package in the metal shell is not impacted by a large current.

[0222] It should be noted that the safety element may also be other forms of safety insurance structures, as long as it can ensure that the core package in the metal shell is not impacted by high current under the impact of high voltage.

[0223] In addition, the structure of arranging a circuit board on the inner side of the cover plate can be applied to embodiments 2 to 13 in addition to embodiment 1. The specific installation method of the circuit board can refer to the above description when applied to embodiment 1, and examples will not be given for each embodiment separately here.

[0224] In the aluminum electrolytic capacitor described in the utility model, Figure 23 to Figure 26 As shown, the metal shell 100 includes a main body 110 and a connecting plate 120, wherein the main body 110 is bent to form a accommodating space. Optionally, the accommodating space is surrounded by three sides, one of which forms an opening; the connecting plate 120 is formed into a plate structure, which is covered on the main body 110 to close the opening.

[0225] Optionally, the connecting plate 120 is welded to the body 110 by laser. Fig.24 As shown, optionally, a first step 121 is provided on the side of the connecting plate 120, and a second step 111 cooperating with the first step 121 is provided on the side of the main body 110 corresponding to the connection plate 120. The first step 121 cooperates with the second step 111 to ensure the stability of the connection between the connecting plate 120 and the main body 110.

[0226] Specifically, combined Figure 23 to Figure 25As shown, when assembling the aluminum electrolytic capacitor, the core package 1000 is firstly arranged in the accommodation space formed by the body 110, and then the connecting plate 120 is covered on the body 110, and the connecting edge between the connecting plate 120 and the body 110 is laser welded.

[0227] Optionally, after the connecting plate 120 is welded to the body 110 , the body 110 and the connecting plate 120 apply a certain pressure to the core package 1000 .

[0228] In the embodiment of the utility model, optionally, the core package 1000 has an airbag structure.

[0229] The aluminum electrolytic capacitor described in this embodiment is connected to the main body 110 through the connection plate 120 to form a metal shell structure, so that the hexahedral or square shell is smaller, thereby saving space. At the same time, there is no need to set an additional pressure plate to apply pressure on the shell to squeeze the core package, thereby saving costs. At the same time, it can avoid placing the core package from the upper opening of the metal shell, causing the problem of scratching the core package, and overcome the difficulty of slightly squeezing the core package in the shell.

[0230] In the embodiment of the utility model, the metal shell 100 and the cover plate 200 may be sealed and connected by laser welding or parallel welding, such as Fig. 27 and Fig.28 As shown, optionally, a stepped surface can be provided at the edge of the connection surface between the metal shell 100 and the cover plate 200, and the metal shell 100 is arranged above the cover plate 200, and laser welding or parallel welding is performed at the connection surface of the metal shell 100 and the cover plate 200 to achieve a sealed connection between the two.

[0231] In the embodiment of the utility model, another implementation mode, optionally, combined with Figure 1 , Fig.29 and Fig.30 As shown, a mounting frame 130 matching the shape of the cover plate 200 can be provided on the top of the metal shell 100, wherein the cover plate 200 is arranged in the mounting frame 130, that is, placed inside the metal shell 100, and then the cover plate 200 and the metal shell 100 are sealed and connected by laser welding or parallel welding.

[0232] Optionally, the height at which the cover plate 200 is arranged on the mounting frame 130 is equal to the thickness of the cover plate 200 .

[0233] The above-mentioned sealing method between the metal shell 100 and the cover plate 200 can ensure effective sealing between the two and make the assembly method of the aluminum electrolytic capacitor simpler and more convenient.

[0234] It should be noted that the sealing method between the metal shell 100 and the cover plate 200 can be applicable to any embodiment of the sealing component in the above-mentioned embodiments 1 to 13, and each embodiment will not be illustrated separately here.

[0235] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An aluminum electrolytic capacitor, It is characterized in that include: A metal shell, a core package and a cover plate arranged on the metal shell, wherein the metal shell and the cover plate form a closed space, and the core package is arranged in the closed space; The core package is connected with an electrode terminal, the cover plate is provided with a first through hole corresponding to the electrode terminal, and the electrode terminal passes through the first through hole and extends out of the cover plate; Wherein, the aluminum electrolytic capacitor further includes a sealing component arranged at the first through hole, for sealing the first through hole.

2. The aluminum electrolytic capacitor according to claim 1, It is characterized in that The cover plate is made of metal material, the sealing component is in the first through hole, filled between the cover plate and the electrode terminal, and the sealing component is made of electrical isolation material.

3. The aluminum electrolytic capacitor according to claim 1, It is characterized in that A limiting member is disposed on the first surface of the cover plate, one limiting member is disposed corresponding to each of the first through holes, and the limiting member is sealed and connected to the cover plate; The stopper comprises a second through hole which is arranged coaxially with the first through hole and communicates with the first through hole, the first through hole and the second through hole constitute an accommodation space, the sealing component is arranged in the accommodation space, the electrode terminal passes through the sealing component and the stopper, and extends out from the stopper; The first surface is a surface away from the closed space.

4. The aluminum electrolytic capacitor according to claim 3, It is characterized in that A first limiting surface is formed in the second through hole, and the sealing component abuts against the first limiting surface; the first limiting surface is perpendicular to the axis of the electrode terminal.

5. The aluminum electrolytic capacitor according to claim 4, It is characterized in that A second limiting surface parallel to the first limiting surface is formed in the first through hole; The sealing assembly includes a main sealing body and an extrusion sheet, wherein the main sealing body is connected to the first limiting surface, and the extrusion sheet is respectively connected to the cover plate and the main sealing body at the second limiting surface, and extrudes the main sealing body in a direction perpendicular to the first limiting surface.

6. The aluminum electrolytic capacitor according to claim 5, It is characterized in that The second through hole comprises a first diameter through hole and a second diameter through hole with different diameters, and the first diameter through hole communicates with the first through hole and the second diameter through hole; Among them, the connecting wall surface between the inner wall of the first diameter through hole and the inner wall of the second diameter through hole forms the first limiting surface, and the connecting wall surface between the inner wall of the first diameter through hole and the inner wall of the first through hole forms the second limiting surface.

7. The aluminum electrolytic capacitor according to claim 6, It is characterized in that The extrusion sheet is arranged in the first through hole on the second surface of the cover plate and abuts against the second limiting surface. A third through hole is arranged at the center of the extrusion sheet. The electrode terminal and the third through hole are coaxially arranged to penetrate the third through hole and the accommodating space. The main sealing body fills the space between the electrode terminal and the limiting member in the accommodating space. The second surface is a surface facing away from the first surface.

8. The aluminum electrolytic capacitor according to claim 7, It is characterized in that The main sealing body includes a first sealing body and a second sealing body; Wherein, the first sealing body comprises a first column connected with the second diameter through hole and a second column connected with a part of the first diameter through hole; The second sealing body comprises a third column connected to another part of the first diameter through hole and a fourth column connected to the third through hole; The bottom surface of the second column is in contact with the top surface of the third column, and the electrode terminal passes through the first column, the second column, the third column and the fourth column in sequence.

9. The aluminum electrolytic capacitor according to claim 8, It is characterized in that At least a portion of the first column extends out of the limiting member.

10. The aluminum electrolytic capacitor according to claim 8, It is characterized in that In the center of the first sealing body, a first center hole, a second center hole and a third center hole are sequentially arranged from the top surface to the bottom surface of the first sealing body with increasing apertures and interconnected with each other; Wherein, the electrode terminal includes an electrode cap, and the electrode cap includes a first part that is matched and connected with the second center hole and a second part that is matched and connected with the third center hole, and the top surface of the electrode cap abuts against the connecting wall surface between the first center hole and the second center hole, and the bottom surface of the electrode cap is arranged on the top surface of the second sealing body.

11. The aluminum electrolytic capacitor according to claim 10, It is characterized in that The electrode cap further comprises a first connection end and a second connection end respectively connected integrally with the electrode cap; The first connection end extends upward from the top surface of the electrode cap and extends out of the first sealing body through the first center hole; the second connection end extends downward from the bottom surface of the electrode cap and passes through the second sealing body and extends out of the second sealing body.

12. The aluminum electrolytic capacitor according to claim 11, It is characterized in that The diameter of the first connecting end is equal to the diameter of the second connecting end and is smaller than the diameters of the first portion and the second portion.

13. The aluminum electrolytic capacitor according to claim 5, It is characterized in that The main sealing body is made of elastic plastic material, and the extrusion sheet is made of metal material.

14. The aluminum electrolytic capacitor according to claim 13, It is characterized in that The extruded sheet and the cover plate are connected by welding.

15. The aluminum electrolytic capacitor according to claim 3, It is characterized in that The shape and size of the outer surface of the limiting member are respectively the same as the shape and size of the first through hole.

16. The aluminum electrolytic capacitor according to claim 7, It is characterized in that The outer surface of the electrode terminal is provided with at least one protrusion, and the main sealing body is provided with a groove which is matched and connected with the protrusion.

17. The aluminum electrolytic capacitor according to claim 7, It is characterized in that The surface connecting the main sealing body and the stopper includes a concave curved surface portion, and the concave curved surface portion is formed by applying a squeezing force at a relative position of the outer surface of the stopper.

18. The aluminum electrolytic capacitor according to claim 2, It is characterized in that The sealing assembly is formed by calcining and melting glass beads in the first through hole.

19. The aluminum electrolytic capacitor according to claim 2, It is characterized in that The sealing assembly includes a sealant filled in the first through hole.

20. The aluminum electrolytic capacitor according to claim 19, It is characterized in that A filling groove is arranged around the first through hole on the first surface of the cover plate away from the closed space, the filling groove is filled with sealant, and the sealant filled in the filling groove and the sealant in the first through hole are made by the same process.

21. The aluminum electrolytic capacitor according to claim 20, It is characterized in that The outer surface of the electrode is provided with a protrusion, and the protrusion is located inside the closed space; Wherein, a blocking rubber ring is sleeved on the electrode terminal, and the blocking rubber ring is arranged between the protrusion and the cover plate.

22. The aluminum electrolytic capacitor according to claim 1, It is characterized in that The sealing assembly includes a connection cap disposed on the cover plate and protruding in a direction away from the enclosed space, the connection cap is made of a metal material and is sealed with the cover plate, the portion of the electrode terminal extending from the cover plate is inserted into the connection cap, and the electrode terminal and the connection cap are connected by welding.

23. The aluminum electrolytic capacitor according to claim 22, It is characterized in that The cover plate is made of metal material, and the cover plate and the connecting cap are integrally formed.

24. The aluminum electrolytic capacitor according to claim 22, It is characterized in that The electrode terminal includes a cathode terminal, and the cover plate is made of a metal material, wherein a first connection cap corresponding to the cathode terminal among the connection caps is sealed and connected to the cover plate by welding.

25. The aluminum electrolytic capacitor according to claim 24, It is characterized in that The electrode terminal also includes an anode terminal, wherein a second connection cap corresponding to the anode terminal in the connection cap is sealed and connected to the cover plate through glass beads; or a ceramic ring is arranged between the second connection cap and the cover plate, and the ceramic ring and the cover plate, and the ceramic ring and the second connection cap are sealed and connected respectively by welding.

26. The aluminum electrolytic capacitor according to claim 25, It is characterized in that The core package includes an anode foil, electrolytic paper and a cathode foil, wherein the anode foil is electrically connected to two anodes, and the cathode foil is electrically connected to two cathodes; the connecting cap includes two first connecting caps corresponding to the two cathodes respectively, and two second connecting caps corresponding to the two anodes respectively.

27. The aluminum electrolytic capacitor according to claim 1, It is characterized in that The cover plate comprises a first sub-plate made of a metal material and a second sub-plate made of an insulating material, the electrode terminal is arranged on the first sub-plate, and the conductive foil strip arranged on the core package is electrically connected to the electrode terminal.

28. The aluminum electrolytic capacitor according to claim 27, It is characterized in that The electrode terminal includes an anode terminal and a cathode terminal, wherein the cathode terminal is connected to the first sub-plate by welding, and the anode terminal is electrically isolated from the first sub-plate by glass beads.

29. The aluminum electrolytic capacitor according to claim 27, It is characterized in that The electrode terminal includes an anode terminal and a cathode terminal, wherein the anode terminal is connected to the first sub-plate by welding, a ceramic ring arranged around the anode terminal is arranged in the first sub-plate, the ceramic ring is fixedly connected to the first sub-plate by welding, and the anode terminal is fixedly connected to a portion of the first sub-plate located inside the ceramic ring by welding.

30. The aluminum electrolytic capacitor according to any one of claims 27 to 29, It is characterized in that The core package includes an anode foil, electrolytic paper and a cathode foil, wherein the anode foil is electrically connected to an anode conductive foil strip, and the cathode foil is electrically connected to a cathode conductive foil strip; wherein the anode conductive foil strip is electrically connected to an anode terminal among the electrode terminals, and the cathode conductive foil strip is electrically connected to a cathode terminal among the electrode terminals.

31. The aluminum electrolytic capacitor according to any one of claims 1 to 29, It is characterized in that A circuit board is disposed inside the closed space and is connected to the cover plate. The electrode terminal passes through the circuit board and extends into the first through hole.

32. The aluminum electrolytic capacitor according to claim 31, It is characterized in that An insulating layer is arranged between the circuit board and the cover plate.

33. The aluminum electrolytic capacitor according to claim 31, It is characterized in that A safety element is arranged on the circuit board.

34. The aluminum electrolytic capacitor according to claim 1, It is characterized in that The cover plate is made of metal material, and the metal shell and the cover plate are connected by laser welding or parallel welding.

35. The aluminum electrolytic capacitor according to claim 3, It is characterized in that The limiting member and the cover plate are connected by laser welding, or the limiting member and the cover plate are integrally formed.

36. The aluminum electrolytic capacitor according to claim 1, It is characterized in that A receiving groove is provided on the first surface of the cover plate, the receiving groove is filled with sealant, the sealing assembly is located below the sealant, and the electrode terminal extends through the sealant; wherein the first surface is a surface away from the enclosed space.

37. The aluminum electrolytic capacitor according to claim 36, It is characterized in that The diameter of the top surface of the accommodating groove is smaller than the diameter of the bottom surface.

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