Aluminum electrolytic capacitor

Abstract

An aluminum electrolytic capacitor, comprising: a metal housing, a core pack and a cover plate covering the metal housing, a closed space being formed by the metal housing and the cover plate, and the core pack being provided in the closed space; electrode terminals are connected to the core pack, and first through holes corresponding to the electrode terminals are formed in the cover plate, the electrode terminals passing through the first through holes and extending out of the cover plate. The aluminum electrolytic capacitor further comprises sealing assemblies provided at the first through holes and used for sealing the first through holes. In the aluminum electrolytic capacitor, the metal housing used for containing the core pack and the cover plate are in sealed connection so as to form the closed space, and in addition, the sealing assemblies are arranged at the first through holes in the cover plate where the electrode terminals pass through and extend out, so as to seal the first through holes, thereby ensuring the sealing effect of the aluminum electrolytic capacitor.

Description

Aluminum electrolytic capacitors

[0001] This disclosure claims priority to the prior Chinese patent application filed on January 18, 2024, with application number 202410073413.6. Technical Field

[0002] The present disclosure relates to the technical field of capacitors, and in particular to an aluminum electrolytic capacitor. Background Art

[0003] Traditional aluminum electrolytic capacitors typically utilize a wound core package. After impregnation, the core is assembled using aluminum shells, rubber plugs, and other accessories. With the miniaturization and flattening of electronic products, traditional cylindrical aluminum electrolytic capacitors lack space efficiency and hinder the trend toward miniaturization and flattening. Due to the limitations of cylindrical aluminum electrolytic capacitors, square aluminum electrolytic capacitors have been developed on the market to effectively meet the miniaturization and flattening requirements of electronic products.

[0004] 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 inability 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 application.

[0005] Summary of the Invention

[0006] The purpose of the technical solution disclosed in the present invention is to provide an aluminum electrolytic capacitor to solve the sealing problem of square aluminum electrolytic capacitors.

[0007] One embodiment of the present disclosure provides an aluminum electrolytic capacitor, comprising:

[0008] A metal shell, a core package, and a cover plate provided on the metal shell, wherein the metal shell and the cover plate form a closed space, and the core package is provided in the closed space;

[0009] The core package is connected to 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;

[0010] The aluminum electrolytic capacitor further includes a sealing component disposed at the first through hole, for sealing the first through hole.

[0011] Optionally, in the aluminum electrolytic capacitor, the cover plate is made of metal material, the sealing component is filled in the first through hole between the cover plate and the electrode terminal, and the sealing component is made of electrical isolation material.

[0012] Optionally, in the aluminum electrolytic capacitor, a limiting member is provided on the first surface of the cover plate, one limiting member is provided corresponding to each first through hole, and the limiting member is sealed to the cover plate;

[0013] The limiting member includes a second through hole that is coaxial with the first through hole and communicates with the first through hole, the first through hole and the second through hole forming an accommodating space, the sealing assembly being disposed in the accommodating space, and the electrode terminal passing through the sealing assembly and the limiting member and extending from the limiting member;

[0014] The first surface is a surface away from the enclosed space.

[0015] 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.

[0016] Optionally, in the aluminum electrolytic capacitor, a second limiting surface parallel to the first limiting surface is formed in the first through hole;

[0017] The sealing assembly includes a main sealing body and an extrusion sheet. The main sealing body is connected to the first limiting surface. 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.

[0018] 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;

[0019] 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.

[0020] Optionally, in the aluminum electrolytic capacitor, the extrusion sheet is provided 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 provided 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; and the main sealing body fills the space between the electrode terminal and the limiting member in the accommodating space;

[0021] The second surface is a surface facing away from the first surface.

[0022] Optionally, in the aluminum electrolytic capacitor, the main sealing body includes a first sealing body and a second sealing body;

[0023] Wherein, the first sealing body includes a first column connected to the second diameter through hole and a second column connected to a portion of the first diameter through hole;

[0024] The second sealing body includes a third column connected to another portion of the first diameter through hole and a fourth column connected to the third through hole;

[0025] 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.

[0026] Optionally, in the aluminum electrolytic capacitor, at least a portion of the first column extends out of the limiting member.

[0027] Optionally, in the aluminum electrolytic capacitor, a first central hole, a second central hole, and a third central hole are sequentially provided in 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 in sequence and are interconnected;

[0028] In which, the electrode terminal includes an electrode cap, which 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.

[0029] Optionally, in the aluminum electrolytic capacitor, the electrode cap further comprises a first connection end and a second connection end respectively integrally connected to the electrode cap;

[0030] The first connecting 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 connecting 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.

[0031] Optionally, in the aluminum electrolytic capacitor, 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 part and the second part.

[0032] 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.

[0033] Optionally, in the aluminum electrolytic capacitor, the extruded sheet and the cover plate are connected by welding.

[0034] 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.

[0035] 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.

[0036] Optionally, in the aluminum electrolytic capacitor, the surface connecting the main sealing body and the limiting member 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 limiting member.

[0037] Optionally, in the aluminum electrolytic capacitor, the sealing assembly is formed by calcining and melting glass beads in the first through hole.

[0038] Optionally, in the aluminum electrolytic capacitor, the sealing assembly includes a sealant filled in the first through hole.

[0039] 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 using the same process.

[0040] Optionally, in the aluminum electrolytic capacitor, a protrusion is provided on the outer surface of the electrode, and the protrusion is located inside the enclosed space;

[0041] 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.

[0042] Optionally, in the aluminum electrolytic capacitor, the sealing assembly includes a connecting cap provided 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, the 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.

[0043] 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.

[0044] Optionally, in the aluminum electrolytic capacitor, the electrode terminal includes a cathode terminal, the cover plate is made of a metal material, and the first connecting cap corresponding to the cathode terminal is sealed and connected to the cover plate by welding.

[0045] Optionally, in the aluminum electrolytic capacitor, the electrode terminal further includes an anode terminal, wherein the 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 provided 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 respectively sealed and connected by welding.

[0046] Optionally, the aluminum electrolytic capacitor, wherein 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.

[0047] 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 provided on the first sub-plate, and the conductive foil strip provided on the core package is electrically connected to the electrode terminal.

[0048] Optionally, in the aluminum electrolytic capacitor, the electrode terminals include 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.

[0049] Optionally, the aluminum electrolytic capacitor, wherein 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 provided 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 the portion of the first sub-plate located inside the ceramic ring by welding.

[0050] 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 the anode terminal among the electrode terminals, and the cathode conductive foil strip is electrically connected to the cathode terminal among the electrode terminals.

[0051] Optionally, in the aluminum electrolytic capacitor, a circuit board is provided inside the enclosed space and is bonded to the cover plate, and the electrode terminal passes through the circuit board and extends into the first through hole.

[0052] Optionally, in the aluminum electrolytic capacitor, an insulating layer is provided between the circuit board and the cover plate.

[0053] Optionally, in the aluminum electrolytic capacitor, a safety component is provided on the circuit board.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Optionally, in the aluminum electrolytic capacitor, a top diameter of the accommodating groove is smaller than a bottom diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0059] FIG1 is a schematic diagram showing the three-dimensional structure of an aluminum electrolytic capacitor according to one embodiment of the present disclosure;

[0060] FIG2 is a schematic diagram showing a three-dimensional structure of a first embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0061] FIG3 is a schematic cross-sectional view of a first embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0062] FIG4 is a schematic perspective view of a second embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0063] FIG5 is a schematic cross-sectional view of a second embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0064] FIG6 is a schematic cross-sectional view of a third embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0065] FIG7 is a schematic cross-sectional view of a fourth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0066] FIG8 is a schematic perspective view of a fifth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0067] FIG9 is a schematic cross-sectional view of a fifth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0068] FIG10 is a schematic cross-sectional view of a sixth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0069] FIG11 is a schematic diagram showing the three-dimensional structure of the cover plate in the sixth embodiment;

[0070] FIG12 is a schematic perspective view of a sixth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0071] FIG13 is a schematic cross-sectional view of a seventh embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0072] FIG14 is a schematic perspective view of an eighth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0073] FIG15 is a schematic cross-sectional view of an eighth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0074] FIG16 is a schematic perspective view of a ninth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0075] FIG17 is a schematic perspective view showing a tenth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0076] FIG18 is a schematic perspective view of an eleventh embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0077] FIG19 is a schematic perspective view of a twelfth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0078] FIG20 is a schematic perspective view of a thirteenth embodiment of the sealing structure of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0079] FIG21 is a schematic diagram showing a three-dimensional structure of an aluminum electrolytic capacitor according to an embodiment of the present disclosure, in which a circuit board is provided;

[0080] FIG22 is a schematic cross-sectional view showing an aluminum electrolytic capacitor according to an embodiment of the present disclosure, provided with a circuit board;

[0081] FIG23 is a schematic diagram showing the exploded structure of the metal shell of the aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0082] FIG24 is a schematic diagram showing an enlarged structure of area A in FIG23;

[0083] FIG25 is a schematic diagram showing the exploded structure of an aluminum electrolytic capacitor according to an embodiment of the present disclosure;

[0084] FIG26 is a schematic diagram showing the three-dimensional structure of an aluminum electrolytic capacitor according to one embodiment of the present disclosure;

[0085] FIG27 is a schematic diagram showing a connection structure between the cover plate and the metal shell in an embodiment of the present disclosure;

[0086] FIG28 is an enlarged view showing part of the structure in FIG27;

[0087] FIG29 is a schematic diagram showing a partial structure of a metal shell in an embodiment of the present disclosure;

[0088] FIG30 is a second schematic diagram showing the connection structure between the cover plate and the metal shell in an embodiment of the present disclosure;

[0089] FIG31 is a partial structural diagram showing an embodiment of the present disclosure according to a twelfth embodiment;

[0090] FIG32 is a schematic structural diagram showing a cover plate in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0091] In order to make the technical problems, technical solutions and advantages to be solved by the present disclosure clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0092] It should be noted that in the embodiments of the present disclosure, when a certain element is mentioned as being "fixed, fixed, connected or communicated with" another element, it can be directly fixed, fixed, connected or communicated with the other element, or it can be indirectly fixed, fixed, connected or communicated with the other element through other intermediate connectors.

[0093] In order to solve the sealing problem of square aluminum electrolytic capacitors, an embodiment of the present disclosure provides an aluminum electrolytic capacitor. A closed space is formed by sealingly connecting a metal shell for accommodating a core package and a cover plate. A sealing assembly is provided at a first through-hole on the metal shell through which an electrode terminal extends to seal the first through-hole, thereby ensuring the sealing effect of the formed aluminum electrolytic capacitor.

[0094] FIG1 is a schematic diagram of the three-dimensional structure of an aluminum electrolytic capacitor according to a first embodiment of the present disclosure, comprising:

[0095] 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;

[0096] The core package is connected to an electrode terminal 300 , and the cover plate 200 is provided with a first through hole 210 corresponding to the electrode terminal 300 . The electrode terminal 300 passes through the first through hole 210 and extends out of the cover plate 200 .

[0097] The aluminum electrolytic capacitor further includes a sealing component disposed at the first through hole 210 for sealing the first through hole 210 .

[0098] In one embodiment of the present disclosure, the metal shell 100 is configured to form a hexagonal space with a quadrilateral opening on the top surface. The cover plate 200 is formed in a quadrilateral and covers the opening to form a hexahedral or square aluminum electrolytic capacitor.

[0099] In one embodiment, optionally, the cover plate 200 is made of metal material, such as aluminum.

[0100] The following will use a hexahedral or square aluminum electrolytic capacitor as an example to illustrate the implementation of the embodiment of the present disclosure. However, it should be noted that the structure and sealing method of the sealing assembly provided at the first through hole 210 on the cover plate 200, as well as the sealing method between the metal shell 100 and the cover plate 200, are not limited to application 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 present disclosure is not limited to application only to hexahedral or square aluminum electrolytic capacitors.

[0101] 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.

[0102] The electrode terminal 300 mentioned in the embodiment of the present disclosure includes an anode terminal and a cathode terminal, wherein the anode terminal and the cathode terminal are both passed through the first through hole 210 on the cover plate 200 and extend out of the cover plate 200, and optionally, the structures of the sealing components at the first through holes corresponding to the anode terminal and the cathode terminal are the same, which will not be described separately in the embodiment of the present disclosure, that is, the electrode terminal 300 mentioned can be either an anode terminal or a cathode terminal.

[0103] 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.

[0104] In one embodiment, optionally, the sealing component is inside the first through hole 210 and filled between the cover plate 200 and the electrode terminal 300 , and the sealing component is made of an electrically insulating material.

[0105] The following describes the specific implementation of the sealing assembly in the embodiment of the present disclosure with examples in combination with the specific implementation.

[0106] Implementation Method 1

[0107] In this embodiment 1, as shown in FIG2 and FIG3 , the cover plate 200 is optionally made of a metal material, such as aluminum. A limiting member 400 is provided on the first surface 201 of the cover plate 200 . A limiting member 400 is provided corresponding to each first through hole 210 . The limiting member 400 is sealed to the cover plate 200 .

[0108] The stopper 400 includes a second through hole 410 that is coaxial 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 disposed in the accommodating space. The electrode terminal 300 passes through the sealing assembly 500 and the stopper 400 and extends from the stopper 400.

[0109] The first surface 201 is a surface away from the enclosed space.

[0110] In this embodiment, by providing the limiting member 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 securing the sealing assembly 500 .

[0111] 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 .

[0112] 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 .

[0113] In the embodiment of the present disclosure, 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.

[0114] As shown in FIG. 2 and FIG. 3 , 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 .

[0115] 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, etc. Correspondingly, the structural shape enclosed by the limiting 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.

[0116] In one embodiment of the present disclosure, optionally, as shown in FIG2 and FIG3 , a second limiting surface 203 parallel to the first limiting surface 401 is formed in the first through hole 210 ;

[0117] 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.

[0118] 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.

[0119] In the embodiment of the present disclosure, 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.

[0120] Optionally, the extrusion sheet 520 is connected to the cover plate 200 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.

[0121] In one embodiment of the present disclosure, optionally, as shown in Figures 2 and 3, the limiting member 400 includes a side panel 402 and a top panel 403, wherein the side panel 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 panel 403 is arranged opposite to the cover plate 200 and is fixedly connected to the side panel 402.

[0122] 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 limiter 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.

[0123] Among them, 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.

[0124] Specifically, as shown in FIG. 3 , the through hole provided on the top plate 403 is formed as a through hole 4102 of the second diameter, and the space surrounded by the side plate 402 is formed as a through hole 4101 of the first diameter.

[0125] In addition, as shown in Figures 2 and 3, the extrusion sheet 520 is provided 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 provided at the center of the extrusion sheet 520. The electrode terminal 300 and the third through hole 521 are coaxially passed through 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.

[0126] In the embodiment of the present disclosure, the second surface 202 is a surface facing away from the first surface 201 .

[0127] In the first embodiment, as shown in FIG. 2 and FIG. 3 , the electrode terminal 300 includes a stepped electrode cap 310 and a first connection end 320 and a second connection end 330 integrally connected to the electrode cap 310 .

[0128] 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.

[0129] 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 connecting end 320 is connected to the top surface of the first portion 311, and the second connecting end 330 is connected to the bottom surface of the second portion 312.

[0130] In this first embodiment, optionally, the first connection end 320 , the electrode cap 310 , and the second connection end 330 are respectively formed into cylindrical structures.

[0131] 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 .

[0132] In this embodiment 1, optionally, the main sealing body 510 includes a first sealing body 511 and a second sealing body 512;

[0133] The first sealing body 511 includes a first column 5111 that is connected to the second diameter through hole 4102 and a second column 5112 that is connected to a portion of the first diameter through hole 4101.

[0134] The second sealing body 512 includes a third column 5121 that is connected to another portion of the first diameter through hole 4101 and a fourth column 5122 that is connected to the third through hole 521 ;

[0135] The bottom surface of the second column 5112 abuts against 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.

[0136] Specifically, as shown in FIG2 and FIG3, in the center of the first sealing body 511, a first center hole, a second center hole and a third center hole are sequentially provided from the top surface to the bottom surface of the first sealing body 511, the apertures of which increase in sequence and are interconnected;

[0137] 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 set on the top surface of the second sealing body 512.

[0138] Optionally, the top surface of the electrode cap 310 and the top surface of the limiting member 400 are located in the same plane.

[0139] 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 .

[0140] In this embodiment, optionally, at least a portion of the first column 5111 extends out of the limiting member 400 .

[0141] 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 is provided in the middle of the electrode terminal 300 to be connected with the main sealing body 510. The electrode cap 310 is provided on the extrusion gasket and is connected with the isolation gasket, so that the electrode cap 310 is electrically isolated from the cover plate 200.

[0142] Furthermore, 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 by welding (preferably laser welding), after the extrusion sheet 520 and the cover plate 200 are welded, the extrusion sheet 520 applies pressure (typically 1-5 MPa) to the extrusion gasket. The extrusion gasket, upon receiving the pressure from the extrusion sheet, also applies pressure to the first sealing body 511 (isolation gasket), causing the isolation gasket to press against the stopper 400. Thus, the extrusion sheet 520 compresses the isolation gasket and the extrusion gasket, creating a seal between the isolation gasket and the extrusion gasket and the electrode terminal 300. In other words, the extrusion sheet 520 compresses and secures the extrusion gasket and the isolation gasket within the accommodation space enclosed by the first through-hole and the stopper 400.

[0143] In addition, in the embodiment of the present disclosure, 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.

[0144] Implementation Method 2

[0145] 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.

[0146] 4 and 5 , a sealing assembly 500 is provided 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 .

[0147] 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.

[0148] 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.

[0149] In this embodiment, the extrusion sheet 520 is connected to the cover plate 200 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.

[0150] In this second embodiment, as shown in Figures 4 and 5, 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 cooperated with the second diameter through hole 4102, a second column 5112 cooperated with the first diameter through hole 4101, and a fourth column 5122 cooperated with the third through hole 521 of the extrusion sheet 520.

[0151] 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.

[0152] In this second embodiment, optionally, the electrode terminal 300 is formed as a cylindrical structure, and a center hole matching the electrode terminal 300 is provided in 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.

[0153] In this embodiment, the main sealing body 510 is arranged in the accommodating space enclosed by the second through hole 410 on the limiter 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 assembly including the main sealing body 510 and the extrusion sheet 520 fills the space between the limiter 400 and the electrode terminal 300 in the accommodating space, and since the extrusion sheet 520 is welded (preferably laser welded) to the cover plate 200, the extrusion sheet 520 applies pressure (the pressure is generally 1-5 MPa) to the main sealing body 510, so that the main sealing body 510 presses against the first limiting surface 401 of the limiter 400, and extrusion sealing is achieved by the main sealing body 510.

[0154] Implementation Method 3

[0155] In this embodiment, as shown in FIG6 , 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.

[0156] 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.

[0157] Unlike 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 by the cooperation between the protrusion 301 and the groove, so as to increase the effect of the extrusion seal, and also achieve the effect of installation between the electrode terminal 300 and the main sealing body 510.

[0158] Implementation Method 4

[0159] In this embodiment, as shown in FIG. 7 , 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.

[0160] 5 and 7 , 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 , which is formed by applying an extrusion force at a relative position on the outer surface of the limiting member 400 .

[0161] In this embodiment, as shown in FIG7 , the relative position of the outer surface of the limit member 400 is formed as a curved portion that is concave toward the center line 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 portion 513.

[0162] With this embodiment, by bending and deforming the connection surface between the main sealing body 510 and the limiting member 400 , the contact area between the main sealing body 510 and the limiting member 400 is increased, and an extrusion sealing effect is achieved.

[0163] Implementation Method Five

[0164] In the fifth embodiment, as shown in FIG8 and FIG9 , the first through hole 210 provided on the cover plate 200 is filled with the sealing component 500 , that is, the sealing component 500 is filled between the electrode terminal 300 and the cover plate 200 in the first through hole 210 .

[0165] In this embodiment, the sealing assembly 500 is formed by calcining and melting glass beads in the first through hole 210 , thereby forming an airtight structure in the first through hole 210 and sealing the first through hole 210 .

[0166] Implementation Method 6

[0167] In the sixth embodiment, as shown in FIG. 10 to FIG. 12 , the first through hole 210 provided on the cover plate 200 is filled with a sealing assembly 500 .

[0168] 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 .

[0169] In the embodiment of the present disclosure, the sealant may be a resin glue, such as a UV-curable glue.

[0170] In this embodiment, as shown in Figures 11 and 12, a filling groove 204 is provided around the first through hole 210 on the first surface 201 of the cover plate 200 away from the enclosed space, and the filling groove 204 is filled with a sealant 205. The sealant filled in the filling groove 204 and the sealant in the first through hole 210 are made using the same process.

[0171] Thus, with this embodiment, the sealing area of ​​the sealing assembly 500 is expanded by extending the sealant sealing the first through hole 210 to the area surrounding the first through hole 210 , thereby achieving an optimal sealing effect.

[0172] Optionally, in this embodiment, as shown in Figures 11 and 12, a protruding edge 2011 is provided on the first surface 201 of the cover plate 200 along the edge of the first surface 201, and the recessed area surrounded by the edge 2011 is formed as a filling groove 204 for filling with sealant.

[0173] Optionally, the thickness of the edge 2011 can be smaller, as long as it can achieve the purpose of surrounding the sealant. Using this embodiment, the sealant can be filled according to the entire first surface of the cover 200, and the filled sealant is filled into the first through hole 210 to achieve the maximum sealing area.

[0174] Optionally, the sealant may be an acrylate series UV curing sealant.

[0175] Implementation Method Seven

[0176] In this seventh embodiment, as shown in FIG13 , 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 .

[0177] 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;

[0178] A blocking rubber ring 600 is sleeved on the electrode terminal 300 , and the blocking rubber ring 600 is disposed between the protrusion 301 and the cover plate 200 .

[0179] 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, the blocking effect of the blocking rubber ring 600 prevents uncured sealant from seeping into the second surface 202 of the cover plate 200.

[0180] Implementation Method Eight

[0181] In this eighth embodiment, as shown in Figures 14 and 15, the sealing assembly includes a connecting cap 700 provided 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 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.

[0182] In the embodiment of the present disclosure, the cover plate 200 is made of a metal material, such as aluminum. Optionally, the cover plate 200 and the connecting cap 700 are integrally formed.

[0183] In this embodiment, the connection cap 700 is sealed against the cover plate 200, and the connection cap 700 is placed over the electrode terminal 300, thereby sealing the first through-hole 210 of the cover plate 200 through which the electrode terminal 300 is inserted. The electrode terminal 300 is inserted into the connection cap 700 through the first through-hole 210, 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. This allows the conductive foil strip on the core package within the metal housing to be electrically connected to external circuitry via the electrode terminal 300 and the connection cap 700.

[0184] Optionally, the connection cap 700 and the electrode terminal 300 may be welded by laser welding or parallel welding.

[0185] It should be noted that the aluminum electrolytic capacitor described in the embodiment of the present disclosure 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 present disclosure applied to a cylindrical aluminum electrolytic capacitor.

[0186] Implementation Method Nine

[0187] In the ninth embodiment, as shown in FIG. 16 , 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.

[0188] 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 enclosed space of the metal shell 100 . The connection cap 700 is made of metal material and is sealed to the cover plate 200 .

[0189] In which, 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 by glass beads 703. In which, 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) need to be sealed between the cover plate, the anode terminal also needs to be insulated and isolated from the cover plate. After using glass beads, it is possible to achieve complete sealing between the electrode terminal and the cover plate, and the glass beads themselves are insulating and also play the 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, as shown in Figure 16, the electrode terminal 300 is connected to the core package provided on the metal shell 100, and optionally, the connecting 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 into the first connection cap 701 , and the anode terminal is correspondingly inserted into the second connection cap 702 .

[0190] 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 here.

[0191] Implementation Method 10

[0192] In this tenth embodiment, as shown in FIG17 , 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, both the metal housing 100 and the cover plate 200 are made of aluminum. The sealing assembly includes a connecting cap 700 disposed on the cover plate 200 and protruding in a direction away from the enclosed space of the metal housing 100. The connecting cap 700 is made of metal and is sealed to the cover plate 200.

[0193] In addition, 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. Optionally, the first connecting 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 connecting cap 702 and the cover plate 200, and the ceramic ring 704 and the cover plate 200, as well as the ceramic ring 704 and the second connecting cap 702, are respectively sealed and connected by brazing. By adopting the ceramic ring 704, and sealingly connecting the ceramic ring 704 and the cover plate 200, as well as the ceramic ring 704 and the second connecting cap 702 by brazing, the sealing effect between the second connecting cap 702 and the cover plate 200 is ensured.

[0194] 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.

[0195] Implementation Method Eleven

[0196] In this eleventh embodiment, as shown in FIG18 , 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, both the metal housing 100 and the cover plate 200 are made of aluminum. The sealing assembly includes a connecting cap 700 disposed on the cover plate 200 and protruding in a direction away from the enclosed space of the metal housing 100. The connecting cap 700 is made of metal and is sealed to the cover plate 200.

[0197] 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.

[0198] 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 cathode 3002 each include a connecting piece electrically connected to the anode foil or cathode foil, and a connecting post connected to the connecting piece, wherein the connecting post extends from the enclosed space of the metal shell 100 and is inserted into the corresponding first connecting cap 701 or second connecting cap 702.

[0199] In one embodiment, optionally, as shown in FIG18 , the two second connection caps 702 are sealed to the cover plate 200 via glass beads 703 . The sealing method is the same as that in the ninth embodiment and will not be described again here.

[0200] In another embodiment, optionally, in combination with what is shown in FIG17 , a ceramic ring 704 may be provided between the two second connecting caps 702 and the cover plate 200. The ceramic ring 704 and the cover plate 200, as well as the ceramic ring 704 and the second connecting cap 702, are respectively sealed and connected by brazing. This sealing method is the same as that in the tenth embodiment and will not be repeated here.

[0201] Implementation Method Twelve

[0202] In this twelfth embodiment, the metal housing is formed into a cylindrical structure, and the cover plate is formed into a circular shape. As shown in Figure 19, 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. The second sub-plate 2002 is arranged closer to the metal housing (not shown) than the first sub-plate 2001, that is, the second sub-plate 2002 is located between the first sub-plate 2001 and the metal housing. In one embodiment, the first sub-plate 2001 is made of aluminum.

[0203] 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 strip disposed inside the metal shell is electrically connected to the electrode terminal 300 .

[0204] Optionally, the electrode terminal 300 is formed into the structure of the electrode terminal of a horn-type capacitor, as shown in Figure 31, including a horn part 3005 and a connecting part 3006. Optionally, the horn part 3005 and the connecting part 3006 can be an integrated structure, and a pin 3007 is passed through the connecting part 3006 to pass through the cover plate 200.

[0205] 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. The anode terminal 3003 is electrically isolated from the first sub-plate 2001 by glass beads 703. As shown in FIG31 , within the cover plate 200, the glass beads 703 isolate the pin 3007 from the cover plate 200 (including the first sub-plate), thereby achieving isolation and sealing between the cover plate 200 and the anode terminal 3003.

[0206] 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.

[0207] 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 conductive foil strip, and the cathode foil is electrically connected (such as by riveting or welding) to a cathode conductive foil strip, the anode conductive foil strip is electrically connected to the anode terminal 3003, and the cathode conductive foil strip is electrically connected to the cathode terminal 3004.

[0208] In this embodiment, the anode terminal and the cathode terminal are sealedly connected to the first sub-plate made of aluminum material, and the entire sub-plate is covered on the second sub-plate, thereby achieving sealing of the first through hole on the second sub-plate.

[0209] Implementation Method Thirteen

[0210] In this embodiment thirteen, similar to embodiment twelfth, the metal housing is formed into a cylindrical structure, and the cover plate is formed into a circular shape. As shown in Figure 20, 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. The second sub-plate 2002 is arranged closer to the metal housing (not shown) than the first sub-plate 2001. In one embodiment, the first sub-plate 2001 is made of aluminum.

[0211] 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, and the anode terminal 3003 is connected to the first sub-plate 2001 by welding (such as by brazing), and a ceramic ring 704 is provided in the first sub-plate 2001 around the anode terminal 3003, 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).

[0212] In this embodiment, a ceramic ring 704 is provided around the anode terminal 3003 to achieve isolation of the anode terminal 3003 from 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.

[0213] In the above-mentioned ninth to thirteenth embodiments, the sealing assembly between the electrode terminal and the cover plate is illustrated by taking a cylindrical capacitor as an example. However, it should be noted that the sealing assembly in these embodiments is not limited to being applicable only to cylindrical capacitors, but can also be applied to hexahedral or square aluminum electrolytic capacitors. Specific examples are not given for each embodiment separately here.

[0214] Figure 32 shows a schematic diagram of the structure of a cover plate 200 in one embodiment of the present disclosure. In this embodiment, a receiving groove is defined on the first surface 201 of the cover plate 200 (the first surface being the surface away from the enclosed space of the capacitor). The receiving groove is filled with sealant 2012. The sealing assembly 500 is positioned below the sealant 2012, and the sealant 2012 extends over the sealing assembly 500, further sealing the sealing assembly 500. Furthermore, the electrode terminal 300 extends outside the cover plate 200 through the sealant 2012.

[0215] Optionally, the top diameter of the accommodating groove is smaller than the bottom diameter, wherein the top surface of the accommodating groove is located on the first surface 201, and the bottom surface of the accommodating groove is located inside the cover plate 200. With this arrangement, the inner wall surface of the accommodating groove is formed as an inclined surface to ensure that the sealant 2012 is firmly fixed in the accommodating groove; in addition, with this embodiment, by filling the sealant 2012 above the sealing assembly 500, when the cover plate 200 is deformed by heat or pressure, the sealant 2012 can press the sealing assembly 500 toward the sealing assembly 500 to ensure the sealing effect of the sealing assembly 500.

[0216] 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.

[0217] In the aluminum electrolytic capacitor described in the embodiments of the present disclosure, in the above-mentioned embodiments 1 to 13, a circuit board is provided inside the enclosed 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 provided between the circuit board and the cover plate. Optionally, the circuit board is bonded to the cover plate, or is spaced apart from the cover plate, that is, the circuit board is provided on the inner side of the cover plate to ensure that it does not affect the power supply of the circuit board. Optionally, a safety member is provided on the circuit board for safety protection of the core package in the enclosed space.

[0218] Taking the first embodiment as an example, as shown in FIG. 21 and FIG. 22 , a circuit board 800 is provided 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 from the limiting member 400 .

[0219] 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.

[0220] In the embodiment of the present disclosure, a safety component is provided on the circuit board 800. Optionally, the safety component includes a safety switch and / or a fuse.

[0221] 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, causing a short circuit between the anode terminal and the cathode terminal, thereby protecting the core package in the metal housing from the impact of the high current.

[0222] 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.

[0223] 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.

[0224] In addition, the structure of arranging a circuit board on the inner side of the cover plate can be applied not only to embodiment one, but also to embodiments two to thirteen. The specific installation method of the circuit board can refer to the above description when applied to embodiment one, and examples will not be given for each embodiment separately here.

[0225] In the aluminum electrolytic capacitor described in the disclosed example, as shown in Figures 23 to 26, the metal shell 100 includes a main body 110 and a connecting plate 120, wherein the main body 110 is bent to form an 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.

[0226] Optionally, the connecting plate 120 is laser welded to the body 110. As shown in FIG24 , a first step 121 is optionally provided on the side of the connecting plate 120, and a second step 111 is provided on the side of the body 110 corresponding to the side where the connecting plate 120 is mounted, which cooperates with the first step 121. The cooperation between the first step 121 and the second step 111 ensures the stability of the connection between the connecting plate 120 and the body 110.

[0227] Specifically, as shown in Figures 23 to 25, when assembling the aluminum electrolytic capacitor, the core package 1000 is first placed in the accommodating space formed by the body 110, and then the connecting plate 120 is covered on the body 110, and laser welding is performed on the connecting edge between the connecting plate 120 and the body 110.

[0228] 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 .

[0229] In the embodiment of the present disclosure, optionally, the core package 1000 has an airbag structure.

[0230] The aluminum electrolytic capacitor described in this embodiment is connected to the main body 110 through the connecting 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 the problem of scratching the core package caused by placing the core package from the upper opening of the metal shell, and overcome the difficulty of slightly squeezing the core package in the shell.

[0231] In the embodiment of the present disclosure, optionally, the metal shell 100 and the cover plate 200 can be sealed by laser welding or parallel welding, as shown in Figures 27 and 28. Optionally, the edge of the connection surface between the metal shell 100 and the cover plate 200 can be provided with a stepped surface, and the metal shell 100 is arranged above the cover plate 200. 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.

[0232] In another embodiment of the present disclosure, optionally, in combination with Figures 1, 29 and 30, 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 by laser welding or parallel welding.

[0233] Optionally, the height of the cover plate 200 disposed on the mounting frame 130 is equal to the thickness of the cover plate 200 .

[0234] 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.

[0235] It should be noted that the sealing method between the metal shell 100 and the cover plate 200 can be applied to any embodiment of the sealing component in the above-mentioned embodiment 1 to embodiment 13, and examples will not be given separately in combination with each embodiment.

[0236] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

[0237] The above is a preferred embodiment of the present disclosure. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present disclosure. These improvements and modifications should also be regarded as within the scope of protection of the present disclosure.

Claims

1. An aluminum electrolytic capacitor, wherein, Comprising: A metal housing, a core package, and a cover plate provided on the metal housing. The metal housing and the cover plate form a closed space, and the core package is disposed within the closed space; An electrode terminal is connected to the core package, and a first through hole corresponding to the electrode terminal is provided on the cover plate. The electrode terminal passes through the first through hole and extends outside the cover plate; Wherein, the aluminum electrolytic capacitor further includes a sealing component disposed at the first through hole for closing the first through hole.

2. The aluminum electrolytic capacitor according to claim 1, wherein, The cover plate is made of a metal material. The sealing component is within the first through hole and fills the space between the cover plate and the electrode terminal, and the sealing component is made of an electrically insulating material.

3. The aluminum electrolytic capacitor according to claim 1, wherein, A limiting member is provided on the first surface of the cover plate. One limiting member is provided corresponding to each first through hole, and the limiting member is sealingly connected to the cover plate; The limiting member includes a second through hole arranged on the same center line as the first through hole and communicating with the first through hole. The first through hole and the second through hole constitute an accommodation space. The sealing component is disposed in the accommodation space, and the electrode terminal passes through the sealing component and the limiting member and extends out of the limiting member; The first surface is the surface away from the closed space.

4. The aluminum electrolytic capacitor according to claim 3, wherein, 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 line of the electrode terminal.

5. The aluminum electrolytic capacitor according to claim 4, wherein, A second limiting surface parallel to the first limiting surface is formed in the first through hole; The sealing component includes a main sealing body and a pressing piece. The main sealing body is connected to the first limiting surface. The pressing piece is connected to the cover plate and the main sealing body at the second limiting surface and presses the main sealing body in a direction perpendicular to the first limiting surface.

6. The aluminum electrolytic capacitor according to claim 5, wherein, The second through hole includes a first diameter through hole and a second diameter through hole with different diameters. The first diameter through hole communicates the first through hole and the second diameter through hole; Wherein, 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, wherein, The pressing piece is disposed 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 provided at the center of the pressing piece. The electrode terminal coaxially passes through the third through hole and the accommodation space with the third through hole, and the main sealing body fills the space between the electrode terminal and the limiting member in the accommodation space; Wherein, the second surface is the surface facing away from the first surface.

8. The aluminum electrolytic capacitor according to claim 7, wherein, The main sealing body includes a first sealing body and a second sealing body; Wherein, the first sealing body includes a first cylinder body that is connected in cooperation with the second diameter through hole and a second cylinder body that is connected in cooperation with a part of the first diameter through hole; The second sealing body includes a third cylinder body that is connected in cooperation with another part of the first diameter through hole and a fourth cylinder body that is connected in cooperation with the third through hole; The bottom surface of the second cylinder abuts against the top surface of the third cylinder, and the electrode terminal sequentially penetrates through the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder.

9. The aluminum electrolytic capacitor according to claim 8, wherein, At least a part of the first cylinder extends out of the limiting member.

10. The aluminum electrolytic capacitor according to claim 8, wherein, At the center of the first sealing body, a first central hole, a second central hole, and a third central hole with sequentially increasing apertures and communicating with each other are sequentially arranged from the top surface to the bottom surface of the first sealing body; Among them, the electrode terminal includes an electrode cap, the electrode cap includes a first part that is cooperatively connected with the second central hole and a second part that is cooperatively connected with the third central hole, and the top surface of the electrode cap abuts against the connecting wall surface between the first central hole and the second central hole, and the bottom surface of the electrode cap is disposed on the top surface of the second sealing body.

11. The aluminum electrolytic capacitor according to claim 10, wherein, The electrode cap further includes a first connection end and a second connection end that are integrally connected to the electrode cap respectively; Among them, 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 central hole; The second connection end extends downward from the bottom surface of the electrode cap and penetrates through the second sealing body and extends out of the second sealing body.

12. The aluminum electrolytic capacitor according to claim 11, wherein, The diameter of the first connection end is equal to the diameter of the second connection end and is smaller than the diameters of the first part and the second part.

13. The aluminum electrolytic capacitor according to claim 5, wherein, The main sealing body is made of an elastic plastic material, and the pressing sheet is made of a metal material.

14. The aluminum electrolytic capacitor according to claim 13, wherein, The pressing sheet and the cover plate are connected by welding.

15. The aluminum electrolytic capacitor according to claim 3, wherein, 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, wherein, At least one protrusion is provided on the outer surface of the electrode terminal, and a groove that is cooperatively connected with the protrusion is provided on the main sealing body.

17. The aluminum electrolytic capacitor according to claim 7, wherein, The surface connecting the main sealing body and the limiting member includes a concave curved surface portion, and the concave curved surface portion is formed by applying an extrusion force to the relative position of the outer surface of the limiting member.

18. The aluminum electrolytic capacitor according to claim 2, wherein, 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, wherein, The sealing assembly includes a sealing glue filled in the first through hole.

20. The aluminum electrolytic capacitor according to claim 19, wherein, On the first surface of the cover plate away from the closed space, a filling groove is provided around the first through hole, the filling groove is filled with a sealing glue, and the sealing glue filled in the filling groove and the sealing glue in the first through hole are made by the same process.

21. The aluminum electrolytic capacitor according to claim 20, wherein, A protrusion is provided on the outer surface of the electrode, and the protrusion is located inside the closed space; Among them, a blocking rubber ring is sleeved on the electrode terminal, and the blocking rubber ring is disposed between the protrusion and the cover plate.

22. The aluminum electrolytic capacitor according to claim 1, wherein, The sealing assembly includes a connecting cap provided on the cover plate and protruding away from the closed space, the connecting cap is made of a metal material and is hermetically connected to the cover plate, the part of the electrode terminal extending out of the cover plate is inserted into the connecting cap, and the electrode terminal and the connecting cap are connected by welding.

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

24. The aluminum electrolytic capacitor according to claim 22, wherein, The electrode terminal includes a cathode terminal, and the cover plate is made of a metallic material. Among them, a first connection cap corresponding to the cathode terminal in the connection cap is hermetically connected to the cover plate by welding.

25. The aluminum electrolytic capacitor according to claim 24, wherein, The electrode terminal further includes an anode terminal. Among them, a second connection cap corresponding to the anode terminal in the connection cap is hermetically connected to the cover plate by glass beads; alternatively, a ceramic ring is provided between the second connection cap and the cover plate, and the ceramic ring is hermetically connected to the cover plate and the second connection cap respectively by welding.

26. The aluminum electrolytic capacitor according to claim 25, wherein, The core package includes an anode foil, electrolytic paper, and a cathode foil. Among them, two anodes are electrically connected to the anode foil, and two cathodes are electrically connected to the cathode foil; the connection cap includes two first connection caps corresponding to the two cathodes respectively, and two second connection caps corresponding to the two anodes respectively.

27. The aluminum electrolytic capacitor according to claim 1, wherein, The cover plate includes a first sub-plate made of a metallic material and a second sub-plate made of an insulating material. The electrode terminal is provided on the first sub-plate, and a conductive foil strip provided on the core package is electrically connected to the electrode terminal.

28. The aluminum electrolytic capacitor according to claim 27, wherein, The electrode terminal includes an anode terminal and a cathode terminal. Among them, 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, wherein, The electrode terminal includes an anode terminal and a cathode terminal. Among them, the anode terminal is connected to the first sub-plate by welding. A ceramic ring is provided in the first sub-plate around the anode terminal. The ceramic ring is fixedly connected to the first sub-plate by welding, and the anode terminal is fixedly connected to the part of the first sub-plate inside the ceramic ring by welding.

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

31. The aluminum electrolytic capacitor according to any one of claims 1 to 29, wherein, Inside the closed space, a circuit board is attached to and connected with the cover plate, and the electrode terminal passes through the circuit board and extends into the first through hole.

32. The aluminum electrolytic capacitor according to claim 31, wherein, An insulating layer is provided between the circuit board and the cover plate.

33. The aluminum electrolytic capacitor according to claim 31, wherein, A safety component is provided on the circuit board.

34. The aluminum electrolytic capacitor according to claim 1, wherein, The cover plate is made of a metallic material, and the metal shell is connected to the cover plate by laser welding or parallel welding.

35. The aluminum electrolytic capacitor according to claim 3, wherein, The limiting component is connected to the cover plate by laser welding, or the limiting component and the cover plate are integrally formed.

36. The aluminum electrolytic capacitor according to claim 1, wherein, A receiving groove is formed on a 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 passes through the sealant and protrudes; among them, the first surface is the surface away from the closed space.

37. The aluminum electrolytic capacitor according to claim 36, wherein, The top surface diameter of the receiving groove is smaller than the bottom surface diameter.

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