CN116313532A - Air-tightness packaging laminated solid aluminum electrolytic capacitor and preparation method thereof - Google Patents

Air-tightness packaging laminated solid aluminum electrolytic capacitor and preparation method thereof Download PDF

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Publication number
CN116313532A
CN116313532A CN202310327191.1A CN202310327191A CN116313532A CN 116313532 A CN116313532 A CN 116313532A CN 202310327191 A CN202310327191 A CN 202310327191A CN 116313532 A CN116313532 A CN 116313532A
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CN
China
Prior art keywords
cathode
end cover
ceramic tube
metal end
tube shell
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CN202310327191.1A
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Chinese (zh)
Inventor
陈巧琳
谢盼盼
王国平
张秋水
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Fujian Guoguang New Industry Technology Co ltd
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Fujian Guoguang New Industry Technology Co ltd
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Priority to CN202310327191.1A priority Critical patent/CN116313532A/en
Publication of CN116313532A publication Critical patent/CN116313532A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/15—Solid electrolytic capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/0029—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

The invention discloses an airtight packaging laminated solid aluminum electrolytic capacitor and a preparation method thereof, the airtight packaging laminated solid aluminum electrolytic capacitor comprises a plurality of cores, a metal end cover, a ceramic tube shell and rivets, wherein the metal end cover and the ceramic tube shell are of square open structures, a U-shaped metal spring plate is arranged on the inner surface of the metal end cover far away from the opening, the U-shaped metal spring plate is electrically connected with the metal end cover, a cathode lead-out part is arranged on the inner surface of the ceramic tube shell far away from the opening, a plurality of cores are sequentially stacked and then are arranged in a cavity formed by sleeving the metal end cover and the ceramic tube shell, the cathode parts of the cores are contacted with the cathode lead-out parts and are electrically connected, the anode parts of the cores are inserted into the openings of the U-shaped metal spring plate, and one end of each rivet sequentially penetrates through the anode parts of each core.

Description

Air-tightness packaging laminated solid aluminum electrolytic capacitor and preparation method thereof
Technical Field
The invention relates to the technical field of solid aluminum electrolytic capacitors, in particular to a gas-tight packaging laminated solid aluminum electrolytic capacitor and a preparation method thereof.
Background
The laminated solid aluminum electrolytic capacitor takes a polymer material with high conductivity as a solid electrolyte, adopts a core package structure with a plurality of cores stacked in parallel, takes epoxy resin as an encapsulation material, protects the core package, and simultaneously shapes a finished product into a square structure suitable for surface mounting. Compared with the traditional liquid aluminum electrolytic capacitor, the laminated solid aluminum electrolytic capacitor has the advantages of better basic electrical property, smaller volume, longer service life, higher environmental protection and safety characteristics and the like, and can better match the development requirements of miniaturization, light weight and high speed of the whole machine in the electronic information industry.
At present, common processes for preparing laminated solid aluminum electrolytic capacitors are: dividing the cut formed foil into an anode region and a cathode region by using barrier glue, and sequentially forming a conductive polymer solid electrolyte layer, a conductive carbon paste layer and a silver paste layer on the surface of the cathode region of the foil to form a core; the anode parts of the cores are welded, the cathode parts are stacked on the upper surface and the lower surface of the peripheral lead frame in a conductive silver adhesive bonding mode to form a core package, the anode and the cathode are led out, the core package is injection-molded and packaged by using an epoxy resin packaging material by using a die, the lead wires extend out of resin shells from the middle parts of the two ends of the core package, and the lead wires are attached to the resin shells to be bent towards the bottom for the second time to form an external terminal.
The laminated solid aluminum electrolytic capacitor prepared by the process has the following defects:
(1) Affecting the reliability of the product: the resin package is of a non-airtight structure, and is easy to be invaded into the capacitor by moisture or corrosive gas and liquid in severe environments such as high temperature, high humidity and the like, so that the performance of the product is deteriorated and even fails.
(2) The yield of the product is affected: the organic packaging resin is directly contacted with the core, is easy to squeeze in from a lamination core gap during injection molding packaging, and generates extrusion deformation to the core, so that leakage current and ESR are increased, delamination is seriously caused, and capacitor failure is caused; the shrinkage of the resin package material when cured produces stress that also negatively affects product performance, causing performance degradation and even failure;
the defects limit the application of the traditional resin packaging sheet type laminated solid aluminum electrolytic capacitor in the fields of complex environments and high reliability requirements, and influence the industrial production yield. Based on the above, the invention designs a gas-tight packaging laminated solid aluminum electrolytic capacitor and a preparation method thereof, so as to solve the problems.
Disclosure of Invention
The invention aims to provide an airtight packaging laminated solid aluminum electrolytic capacitor and a preparation method thereof, which are used for solving the problems that the laminated solid aluminum electrolytic capacitor prepared by the prior art is easy to be invaded into the capacitor by moisture or corrosive gas and liquid under severe environments such as high temperature, high humidity and the like, so that the performance of the product is deteriorated and even fails.
In order to achieve the above purpose, the present invention provides the following technical solutions: the metal end covers and the ceramic tube shells are of square open structures, and the two openings of the metal end covers and the ceramic tube shells are mutually sleeved and connected in an airtight manner;
the U-shaped metal elastic sheet is arranged on the inner surface of the metal end cover far away from the opening, the opening of the U-shaped elastic sheet faces the opening direction of the metal end cover, and the U-shaped metal elastic sheet is electrically connected with the metal end cover;
the inner surface of the ceramic tube shell far away from the opening is provided with a cathode lead-out part, and the cathode lead-out part penetrates out of the side wall of the ceramic tube shell far away from the opening;
the core is arranged in a cavity formed by sleeving the metal end cover and the ceramic shell after a plurality of cores are sequentially stacked, the cathode part of the core is in contact with the cathode lead-out part and is electrically connected with the cathode lead-out part, the anode part of the core is inserted into the opening of the U-shaped metal elastic sheet, one end of the rivet sequentially penetrates through the anode part of each core, and two ends of the rivet are respectively in contact with two opposite side walls of the U-shaped metal elastic sheet and are electrically connected with the anode part of each core.
Preferably, the two opposite ends of the rivet penetrate through the anode part of the core and then are bent towards the cathode part of the core, and the two bending parts of the rivet are respectively contacted with the two opposite side walls of the U-shaped metal elastic sheet.
Preferably, the open end of the ceramic shell comprises a first open part and a second open part which are sequentially connected, the opening of the first open part is smaller than the opening of the second open part, the first open part is arranged at one end close to the metal end cover, the opening of the metal end cover and the outer surface of the first open part are mutually sleeved, the inner side surface of the first open part is contacted with the outer side surfaces of two opposite side walls of the U-shaped metal elastic sheet, and a rectangular metal ring is embedded in the outer side surface of one end of the first open part close to the second open part.
Preferably, the outer side surfaces of the metal end covers are all provided with tin layers.
Preferably, the cathode lead-out part comprises a cathode tongue part, a cathode connecting part, a cathode pin vertical part and two cathode pin horizontal parts which are connected, wherein the cathode tongue part is connected with the cathode pin vertical part through the cathode connecting part, the cathode connecting part is arranged inside the ceramic tube shell in a penetrating way, the cathode tongue part and the cathode pin vertical part are respectively arranged on the inner surface and the outer surface of the ceramic tube shell far away from one end of the opening, the two cathode pin horizontal parts are respectively arranged on the upper surface and the lower surface of the ceramic tube shell far away from one end of the opening, and one ends of the two cathode pin horizontal parts are connected with the cathode pin vertical part.
Preferably, the outer surfaces of the cathode pin vertical part and the two cathode pin horizontal parts are provided with tin layers.
Preferably, the length of the cathode pin horizontal part is 20% -30% of the finished capacitor length.
Preferably, the length of the metal end cover is 20% -25% of the length of the finished capacitor product.
A method for manufacturing an air-tight packaging laminated solid aluminum electrolytic capacitor, the method comprising the steps of:
s1, punching and cutting a formed aluminum foil into a rectangle with a through hole at one end, coating barrier glue to form an anode part with the through hole and a cathode part without the through hole, and sequentially forming a conductive polymer layer, a conductive carbon paste layer and a conductive silver paste layer on the surface of the cathode part to prepare a cathode part to obtain a core;
s2, adhering and solidifying cathode parts of the cores through conductive silver adhesive according to the number of design layers, sequentially penetrating through anode part through holes of the cores through rivets, bending exposed parts at two ends of the rivets towards the direction of the cathode parts and tightly attaching the exposed parts to the surfaces of the anode parts to form a group of bending parts, and fixedly connecting and electrically connecting the anode parts of the cores to obtain a first core package;
s3, fixing and electrically connecting the rivet bending part on the first core pack with the two side surfaces of the U-shaped metal elastic sheet in a welding mode, so as to realize the connection of the first core pack and the metal end cover and form a second core pack;
s4, combining the second core package with the ceramic tube shell arranged outside and connecting the second core package with the ceramic tube shell in a sealing manner to obtain a semi-finished product of the capacitor;
and S5, electroplating the semi-finished product of the capacitor, and forming tin layers on the outer surfaces of the metal end cover, the cathode pin vertical part and the outer surfaces of the two cathode pin horizontal parts to obtain the hermetically packaged laminated solid aluminum electrolytic capacitor.
Preferably, the step S4 specifically includes:
s41, filling conductive silver paste into one end of the ceramic tube shell far away from the opening, so that the conductive silver paste covers the surface of the cathode tongue;
s42, extending the cathode part of the second core pack into the cavity of the ceramic tube shell, and bonding the cathode part of the second core pack and the cathode tongue part in the ceramic sleeve;
s43, the metal end cover of the second core bag and the first opening of the ceramic tube shell are mutually sleeved, and then the edge of the opening of the metal end cover is fixedly connected with the rectangular metal ring on the first opening through welding, so that airtight sealing is formed between the metal end cover and the ceramic tube shell.
Compared with the prior art, the invention has the beneficial effects that:
the capacitor disclosed by the invention uses the metal end cover matched with the inorganic material of the ceramic tube shell as the shell, so that the airtight connection of the capacitor is realized, and compared with the resin encapsulation, the airtight connection is better, the product reliability is better, and the capacitor is more suitable for being applied in severe environments such as high temperature, high humidity and the like;
meanwhile, when the capacitor is prepared, the capacitor core package is stacked in advance and then is integrally arranged in a protection cavity formed by the metal end cover and the ceramic tube shell, so that extrusion damage of the liquid resin package material to the core package and damage of stress generated in the curing process of the resin package material to the core performance in the traditional resin injection molding packaging process are avoided, the problems of leakage current and ESR increase caused by packaging are solved, and the industrialization yield is remarkably improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a solid aluminum electrolytic capacitor of the present invention;
FIG. 2 is a schematic diagram showing a front sectional structure of a solid aluminum electrolytic capacitor of the present invention;
FIG. 3 is a schematic view of the structure of a metal end cap in the solid aluminum electrolytic capacitor of the present invention;
FIG. 4 is a schematic structural view of a ceramic envelope in a solid aluminum electrolytic capacitor according to the present invention;
FIG. 5 is a schematic cross-sectional view of the ceramic envelope in the solid aluminum electrolytic capacitor of the present invention;
FIG. 6 is a schematic view showing the structure of a cathode lead-out portion in a solid aluminum electrolytic capacitor according to the present invention;
FIG. 7 is a schematic flow chart of a method for manufacturing a solid aluminum electrolytic capacitor according to the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
a core; 2. a metal end cap; 3. a ceramic envelope; 31. a rectangular metal ring; 4. a rivet; 5. u-shaped metal spring plates; 6. a cathode lead-out portion; 61. a cathode tongue; 62. a cathode connection portion; 63. cathode pin vertical part; 64. cathode pin horizontal portion.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, the present invention provides a technical solution as follows:
the utility model provides an airtight packaging lamination solid-state aluminum electrolytic capacitor, includes a plurality of piece cores 1, metal end cover 2, ceramic tube shell 3 and rivet 4, and metal end cover 2 and ceramic tube shell 3 are square open structure, and metal end cover 2 and ceramic tube shell 3's two open mutually overlap and gas tightness connect;
the inner surface of the metal end cover 2 far away from the opening is provided with a U-shaped metal spring piece 5, the opening of the U-shaped spring piece 5 faces the opening direction of the metal end cover 2, and the U-shaped metal spring piece 5 is electrically connected with the metal end cover 2;
the inner surface of the ceramic tube shell 3 far away from the opening is provided with a cathode lead-out part 6, and the cathode lead-out part 6 penetrates out of the side wall of the ceramic tube shell 3 far away from the opening;
several cores 1 are stacked in sequence and then are arranged in a cavity formed by sleeving the metal end cover 2 and the ceramic tube shell 3, the cathode part of the core 1 is in contact with the cathode lead-out part 6 and is electrically connected, the anode part of the core 1 is inserted into the opening of the U-shaped metal spring piece 5, one end of the rivet 4 sequentially penetrates through the anode part of each core 1, and two ends of the rivet 4 are respectively in contact with two opposite side walls of the U-shaped metal spring piece 5 and are electrically connected.
Specifically, opposite ends of the rivet 4 penetrate through the anode part of the core 1 and then are bent towards the cathode part of the core 1, and two bending parts of the rivet 4 are respectively contacted with opposite side walls of the U-shaped metal elastic sheet 5.
From the above description, it is clear that: the rivet is through the area of contact of increase and U type metal shrapnel after buckling to guarantee the stable connection of rivet and U type metal shrapnel, realize stable electric connection.
Specifically, the open end of ceramic tube shell 3 is including the first open portion and the second open portion that connect gradually, and the open of first open portion is less than the open of second open portion, and the first open portion sets up in the one end that is close to metal end cover 2, and the open of metal end cover 2 and the surface of first open portion overlap each other and set up, and the inside surface of first open portion contacts with the outside surface of the relative both sides wall of U type metal shrapnel 5, and the first open portion is close to the one end outside surface of second open portion and is embedded to be provided with rectangle metal ring 31.
From the above description, it is clear that: the open part of the ceramic tube shell is formed by combining the first open part and the second open part to form a two-stage ladder-shaped structure so as to increase the matching degree on the structure of the metal end cover, and the sealing connection of the ceramic tube shell and the metal end cover is realized by utilizing the metal ring, so that the air tightness of the metal end cover and the ceramic tube shell is improved.
Specifically, the outer side surfaces of the metal end caps 2 are provided with tin layers.
Specifically, the cathode lead-out portion 6 includes a cathode tongue 61, a cathode connecting portion 62, a cathode pin vertical portion 63 and two cathode pin horizontal portions 64 that are connected, the cathode tongue 61 is connected with the cathode pin vertical portion 63 through the cathode connecting portion 62, and the cathode connecting portion 62 is inserted inside the ceramic package 3, the cathode tongue 61 and the cathode pin vertical portion 63 are respectively disposed on an inner surface and an outer surface of the ceramic package 3 far away from the open end, the two cathode pin horizontal portions 64 are respectively disposed on an upper surface and a lower surface of the ceramic package 3 far away from the open end, and one ends of the two cathode pin horizontal portions 64 are connected with the cathode pin vertical portion 63.
From the above description, it is clear that: the anode of the capacitor is a terminal wrapped by 5 vertical faces formed by the metal end cover, and the cathode adopts the terminal structure of the three vertical faces, so that the anode and the cathode of the capacitor are of a positive-negative symmetrical structure, the positive and the negative of the capacitor are not required to be distinguished during welding of the upper plate, the anode terminal and the cathode terminal can be distinguished obviously in appearance, the identification is easy, the reverse connection of the positive and the negative is effectively prevented, and the capacitor is suitable for fool-proof requirements of industrial production.
Specifically, the outer surfaces of the cathode pin vertical portion 63 and the two cathode pin horizontal portions 64 are each provided with a tin layer.
Specifically, the length of cathode pin horizontal portion 64 is 20% -30% of the finished capacitor length.
Specifically, the length of the metal end cover 2 is 20% -25% of the length of the finished capacitor.
From the above description, it is clear that: considering the operability requirement of the welding process, the tail end of the U-shaped metal elastic sheet needs to be prolonged to form the edge of the metal end cover, namely the length of the metal end cover determines the length of the core anode part, and under the condition that the total length of the core is fixed, the longer the core anode part is, the shorter the core cathode part is, the effective area of the cathode is reduced, and the capacitance is reduced; a sufficient distance is required between a metal end cover serving as an anode pin and a cathode pin horizontal part to prevent short circuit caused by diffusion contact of soldering paste after the upper plate is welded; the pins need to provide enough welding area to meet the welding firmness; therefore, the length of the core cathode part can be increased as much as possible on the basis of meeting the process operability by selecting the proper length of the metal end cover and matching the length of the cathode pin horizontal part, so that the capacitance of the capacitor is increased, the welding area requirement of the anode pin and the cathode pin is met, and the two-pole short circuit is prevented.
Referring to fig. 7, another technical solution provided by the present invention is as follows:
the preparation method of the airtight packaging laminated solid aluminum electrolytic capacitor comprises the following steps:
s1, punching and cutting a formed aluminum foil into a rectangle with a through hole at one end, coating barrier glue to form an anode part with the through hole and a cathode part without the through hole, and sequentially forming a conductive polymer layer, a conductive carbon paste layer and a conductive silver paste layer on the surface of the cathode part to prepare a cathode part to obtain a core 1;
s2, adhering and solidifying cathode parts of the plurality of cores 1 through conductive silver adhesive according to the number of design layers, sequentially penetrating through anode part through holes of the plurality of cores 1 through rivets 4, bending exposed parts at two ends of the rivets 4 towards the cathode part direction and tightly attaching the exposed parts to the surface of the anode part to form a group of bending parts, and fixedly connecting and electrically connecting the anode parts of the plurality of cores 1 to obtain a first core package;
s3, fixing and electrically connecting the bending part of the rivet 4 on the first core package with the surfaces of the two sides of the U-shaped metal elastic sheet 5 in a welding mode, so as to realize the connection of the first core package and the metal end cover 2 and form a second core package;
s4, combining and sealing the second core package with the external ceramic tube shell 3 to obtain a semi-finished capacitor product;
and S5, electroplating the semi-finished product of the capacitor, and forming tin layers on the outer surfaces of the metal end cover 2, the cathode pin vertical parts 63 and the outer surfaces of the two cathode pin horizontal parts 64 to obtain the airtight packaging laminated solid aluminum electrolytic capacitor.
Specifically, step S4 specifically includes:
s41, filling conductive silver paste into one end of the ceramic tube shell 3 far away from the opening, so that the conductive silver paste covers the surface of the cathode tongue 61;
s42, extending the cathode part of the second core pack into the cavity of the ceramic tube shell 3, and bonding the cathode part of the second core pack and the cathode tongue 61 in the ceramic sleeve 3;
s43, the metal end cover 2 of the second core package and the first opening of the ceramic tube shell 3 are mutually sleeved, and then the edge of the opening of the metal end cover 2 is fixedly connected with the rectangular metal ring 31 on the first opening through welding, so that airtight sealing is formed between the metal end cover 2 and the ceramic tube shell 3.
An embodiment of the present invention is (shown in fig. 1-7):
the air-tightness packaging laminated solid aluminum electrolytic capacitor comprises a plurality of cores 1, a metal end cover 2 (the length of the metal end cover 2 is 23 percent of the length of a finished capacitor product, and the main materials are copper and copper alloy), a ceramic tube shell 3 and a rivet 4 (the materials are copper and copper alloy), wherein the metal end cover 2 and the ceramic tube shell 3 are of square open structures, and the two openings of the metal end cover 2 and the ceramic tube shell 3 are mutually sleeved and connected in an air-tightness manner;
the inner surface of the metal end cover 2 far away from the opening is provided with a U-shaped metal spring piece 5, the opening of the U-shaped spring piece 5 faces the opening direction of the metal end cover 2, the U-shaped metal spring piece 5 is electrically connected with the metal end cover 2, and the outer side surface of the metal end cover 2 is provided with a tin layer;
the inner surface of the ceramic tube shell 3 far away from the opening is provided with a cathode lead-out part 6 (copper and copper alloy), the cathode lead-out part 6 penetrates out of the side wall of the ceramic tube shell 3 far away from the opening, the opening end of the ceramic tube shell 3 comprises a first opening part and a second opening part which are sequentially connected, the opening of the first opening part is smaller than that of the second opening part, the first opening part is arranged at one end close to the metal end cover 2, the opening of the metal end cover 2 and the outer surface of the first opening part are mutually sleeved, the inner side surface of the first opening part is contacted with the outer side surfaces of two opposite side walls of the U-shaped metal spring 5, and a rectangular metal ring 31 (Kovar alloy is embedded in the outer side surface of one end of the first opening part close to the second opening part);
as shown in fig. 2: the multiple cores 1 are stacked in sequence and then arranged in a cavity formed by sleeving the metal end cover 2 and the ceramic tube shell 3, the cathode part of the core 1 is in contact with the cathode lead-out part 6 and is electrically connected, the anode part of the core 1 is inserted into the opening of the U-shaped metal spring piece 5, one end of the rivet 4 sequentially penetrates through the anode part of each core 1, the opposite ends of the rivet 4 penetrate out of the anode part of the core 1 and then are bent towards the cathode part of the core 1, and the two bent parts of the rivet 4 are respectively in contact with the opposite side walls of the U-shaped metal spring piece 5 and are electrically connected;
as shown in fig. 5 and 6: in this embodiment, the cathode lead-out portion 6 includes a cathode tongue 61, a cathode connecting portion 62, a cathode lead vertical portion 63 and two cathode lead horizontal portions 64 (the length of the cathode lead horizontal portion 64 is 25% of the length of the capacitor finished product), the cathode tongue 61 and the cathode lead vertical portion 63 are connected by the cathode connecting portion 62, the cathode connecting portion 62 is arranged inside the ceramic package 3 in a penetrating manner, the cathode tongue 61 and the cathode lead vertical portion 63 are respectively arranged on the inner surface and the outer surface of the ceramic package 3 far away from the open end, the two cathode lead horizontal portions 64 are respectively arranged on the upper surface and the lower surface of the ceramic package 3 far away from the open end, one ends of the two cathode lead horizontal portions 64 are connected with the cathode lead vertical portion 63, and the outer surfaces of the cathode lead vertical portion 63 and the two cathode lead horizontal portions 64 are respectively provided with tin layers.
As shown in fig. 7: the preparation method of the laminated solid aluminum electrolytic capacitor comprises the following steps:
the preparation method of the airtight packaging laminated solid aluminum electrolytic capacitor comprises the following steps:
s1, punching and cutting a formed aluminum foil into a rectangle with a through hole at one end, coating barrier glue to form an anode part with the through hole and a cathode part without the through hole, and sequentially forming a conductive polymer layer, a conductive carbon paste layer and a conductive silver paste layer on the surface of the cathode part to prepare a cathode part to obtain a core 1;
s2, adhering and solidifying cathode parts of the plurality of cores 1 through conductive silver adhesive according to the number of design layers, sequentially penetrating through anode part through holes of the plurality of cores 1 through rivets 4, bending exposed parts at two ends of the rivets 4 towards the cathode part direction and tightly attaching the exposed parts to the surface of the anode part to form a group of bending parts, and fixedly connecting and electrically connecting the anode parts of the plurality of cores 1 to obtain a first core package;
s3, fixing and electrically connecting the bending part of the rivet 4 on the first core package with the surfaces of the two sides of the U-shaped metal elastic sheet 5 in a welding mode, so as to realize the connection of the first core package and the metal end cover 2 and form a second core package;
in this embodiment, the welding method may use brazing, fusion welding, resistance welding, or the like;
s4, combining and sealing the second core package with the external ceramic tube shell 3 to obtain a semi-finished capacitor product;
in this embodiment, step S4 specifically includes:
s41, filling conductive silver paste into one end of the ceramic tube shell 3 far away from the opening, so that the conductive silver paste covers the surface of the cathode tongue 61;
s42, extending the cathode part of the second core pack into the cavity of the ceramic tube shell 3, and bonding the cathode part of the second core pack and the cathode tongue 61 in the ceramic sleeve 3;
s43, sleeving the metal end cover 2 of the second core package and the first opening of the ceramic tube shell 3, and fixedly connecting the opening edge of the metal end cover 2 with the rectangular metal ring 31 on the first opening by welding to form airtight sealing between the metal end cover 2 and the ceramic tube shell 3
And S5, electroplating the semi-finished product of the capacitor, and forming tin layers on the outer surfaces of the metal end cover 2, the cathode pin vertical parts 63 and the outer surfaces of the two cathode pin horizontal parts 64 to obtain the airtight packaging laminated solid aluminum electrolytic capacitor.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (10)

1. The utility model provides a solid-state aluminium electrolytic capacitor of gas tightness encapsulation stromatolite which characterized in that: the ceramic shell comprises a plurality of cores (1), a metal end cover (2), a ceramic shell (3) and rivets (4), wherein the metal end cover (2) and the ceramic shell (3) are of square open structures, and the two openings of the metal end cover (2) and the ceramic shell (3) are mutually sleeved and connected in an airtight manner;
the metal end cover (2) is provided with a U-shaped metal spring piece (5) far away from the inner surface of the opening, the opening of the U-shaped spring piece (5) faces the opening direction of the metal end cover (2), and the U-shaped metal spring piece (5) is electrically connected with the metal end cover (2);
the inner surface of the ceramic tube shell (3) far away from the opening is provided with a cathode lead-out part (6), and the cathode lead-out part (6) penetrates out of the side wall of the ceramic tube shell (3) far away from the opening;
several cores (1) are stacked in turn and then are arranged in a cavity formed after the metal end cover (2) and the ceramic tube shell (3) are sleeved, the cathode part of the cores (1) is in contact with the cathode lead-out part (6) and is electrically connected, the anode part of the cores (1) is inserted into the opening of the U-shaped metal elastic sheet (5), one end of each rivet (4) sequentially penetrates through the anode part of each core (1), and two ends of each rivet (4) are respectively in contact with two opposite side walls of the U-shaped metal elastic sheet (5) and are electrically connected.
2. The hermetically sealed stacked solid aluminum electrolytic capacitor of claim 1, wherein: opposite ends of the rivet (4) penetrate through the anode part of the core (1) and then are bent towards the cathode part of the core (1), and two bending parts of the rivet (4) are respectively contacted with opposite side walls of the U-shaped metal elastic sheet (5).
3. The hermetically sealed stacked solid aluminum electrolytic capacitor of claim 1, wherein: the open end of ceramic tube shell (3) is including the first open portion and the second open portion that connect gradually, the open of first open portion is less than the open of second open portion, and the first open portion sets up the one end that is close to metal end cover (2), the open of metal end cover (2) and the surface of first open portion overlap each other and set up, the interior side surface of first open portion contacts with the outside surface of the relative both sides wall of U type metal shell fragment (5), the first open portion is close to the one end outside surface of second open portion and is embedded to be provided with rectangle metal ring (31).
4. The hermetically sealed stacked solid aluminum electrolytic capacitor of claim 1, wherein: and the outer side surfaces of the metal end covers (2) are provided with tin layers.
5. The hermetically sealed stacked solid aluminum electrolytic capacitor of claim 1, wherein: the cathode lead-out part (6) comprises a cathode tongue part (61), a cathode connecting part (62), a cathode pin vertical part (63) and two cathode pin horizontal parts (64) which are connected, wherein the cathode tongue part (61) is connected with the cathode pin vertical part (63) through the cathode connecting part (62), the cathode connecting part (62) is penetrated inside the ceramic tube shell (3), the cathode tongue part (61) and the cathode pin vertical part (63) are respectively arranged on the inner surface and the outer surface of the ceramic tube shell (3) far away from the open end, the two cathode pin horizontal parts (64) are respectively arranged on the upper surface and the lower surface of the ceramic tube shell (3) far away from the open end, and one ends of the two cathode pin horizontal parts (64) are connected with the cathode pin vertical part (63).
6. The hermetically sealed and stacked solid aluminum electrolytic capacitor of claim 5, wherein: the outer surfaces of the cathode pin vertical part (63) and the two cathode pin horizontal parts (64) are respectively provided with a tin layer.
7. The hermetically sealed and stacked solid aluminum electrolytic capacitor of claim 5, wherein: the cathode pin horizontal portion (64) has a length of 20% -30% of the finished capacitor length.
8. The hermetically sealed stacked solid aluminum electrolytic capacitor of claim 1, wherein: the length of the metal end cover (2) is 20% -25% of the length of the finished capacitor.
9. A method for manufacturing a hermetically sealed stacked solid aluminum electrolytic capacitor as claimed in any one of claims 1 to 8, characterized by: the preparation method comprises the following steps:
s1, punching and cutting a formed aluminum foil into a rectangle with a through hole at one end, coating barrier glue to form an anode part with the through hole and a cathode part without the through hole, and sequentially forming a conductive polymer layer, a conductive carbon paste layer and a conductive silver paste layer on the surface of the cathode part to prepare a cathode part to obtain a core (1);
s2, adhering and solidifying cathode parts of the plurality of cores (1) through conductive silver adhesive according to the number of design layers, sequentially penetrating through anode part through holes of the plurality of cores (1) through rivets (4), bending exposed parts at two ends of the rivets (4) towards the cathode part direction and tightly attaching the anode part surface to form a group of bending parts, and fixedly connecting and electrically connecting the anode parts of the plurality of cores (1) to obtain a first core package;
s3, fixing and electrically connecting the bending part of the rivet (4) on the first core pack with the surfaces of the two sides of the U-shaped metal elastic sheet (5) in a welding mode, so as to realize the connection of the first core pack and the metal end cover (2) and form a second core pack;
s4, combining and sealing the second core package with the external ceramic tube shell (3) to obtain a semi-finished capacitor;
and S5, electroplating the semi-finished product of the capacitor, and forming tin layers on the outer surfaces of the metal end cover (2), the cathode pin vertical parts (63) and the outer surfaces of the two cathode pin horizontal parts (64) to obtain the hermetically packaged laminated solid aluminum electrolytic capacitor.
10. The method for manufacturing a hermetically sealed stacked solid aluminum electrolytic capacitor of claim 9, wherein: the step S4 specifically includes:
s41, filling conductive silver paste into one end of the ceramic tube shell (3) far away from the opening, so that the conductive silver paste covers the surface of the cathode tongue (61);
s42, extending the cathode part of the second core pack into the cavity of the ceramic tube shell (3), and bonding the cathode part of the second core pack and a cathode tongue part (61) in the ceramic tube (3);
s43, sleeving the metal end cover (2) of the second core package and the first opening of the ceramic tube shell (3), and fixedly connecting the opening edge of the metal end cover (2) with the rectangular metal ring (31) on the first opening through welding to form airtight sealing between the metal end cover (2) and the ceramic tube shell (3).
CN202310327191.1A 2023-03-30 2023-03-30 Air-tightness packaging laminated solid aluminum electrolytic capacitor and preparation method thereof Pending CN116313532A (en)

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CN202310327191.1A CN116313532A (en) 2023-03-30 2023-03-30 Air-tightness packaging laminated solid aluminum electrolytic capacitor and preparation method thereof

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