CN115360019B - Solid aluminum electrolytic capacitor and preparation method thereof - Google Patents
Solid aluminum electrolytic capacitor and preparation method thereof Download PDFInfo
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- CN115360019B CN115360019B CN202210902878.9A CN202210902878A CN115360019B CN 115360019 B CN115360019 B CN 115360019B CN 202210902878 A CN202210902878 A CN 202210902878A CN 115360019 B CN115360019 B CN 115360019B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 243
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 81
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000007787 solid Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 70
- 230000004888 barrier function Effects 0.000 claims abstract description 57
- 239000011889 copper foil Substances 0.000 claims abstract description 57
- 210000002105 tongue Anatomy 0.000 claims description 62
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 22
- 238000000605 extraction Methods 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 239000003292 glue Substances 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 239000000565 sealant Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 239000011257 shell material Substances 0.000 description 68
- 239000010410 layer Substances 0.000 description 61
- 230000032683 aging Effects 0.000 description 31
- 239000011888 foil Substances 0.000 description 24
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 230000008439 repair process Effects 0.000 description 7
- 238000001746 injection moulding Methods 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229920001940 conductive polymer Polymers 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 238000012858 packaging process Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
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- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
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- 238000007747 plating Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 239000012792 core layer Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002224 dissection Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 229910000833 kovar Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H01G9/008—Terminals
- H01G9/012—Terminals specially adapted for solid 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
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
-
- 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
- H01G9/10—Sealing, e.g. of lead-in wires
-
- 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
- H01G9/153—Skin fibre
-
- 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
- H01G9/26—Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices with each other
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention discloses a solid aluminum electrolytic capacitor and a preparation method thereof, wherein the solid aluminum electrolytic capacitor comprises N capacitor cores, N-1 barrier layers, N-1 copper foils, an outer shell and a cover plate, the N capacitor cores are sequentially stacked and then are arranged in the outer shell to form a semi-finished capacitor product, the barrier layers and the copper foils are sequentially arranged between the cathode parts of two adjacent capacitor cores from bottom to top, and the cover plate is arranged on the semi-finished capacitor product and sealed to form the solid aluminum electrolytic capacitor.
Description
Technical Field
The invention relates to the technical field of solid aluminum electrolytic capacitors, in particular to a solid aluminum electrolytic capacitor and a preparation method thereof.
Background
The chip laminated solid aluminum electrolytic capacitor takes conductive polymer material as solid electrolyte, has a core-in-package structure with multiple layers of cores stacked in parallel and a product appearance suitable for surface mounting, and has the advantages of smaller volume, better basic electrical property, longer service life, excellent frequency impedance characteristic and temperature characteristic, higher environmental protection and safety characteristic and the like compared with the traditional liquid aluminum electrolytic capacitor.
At present, common processes for preparing a chip type laminated solid aluminum electrolytic capacitor are as follows: dividing an anode region and a cathode region of the cut formed foil 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 capacitor core; and sequentially stacking a plurality of capacitor cores on the peripheral lead frame to form a capacitor core package, leading out an anode and a cathode, and packaging the capacitor core package by resin, aging and forming pins to obtain the solid aluminum electrolytic capacitor.
The process has the following defects:
1. the stacked capacitor cores are electrically conducted, the anode part and the cathode part are respectively electrically connected with the single anode terminal part and the single cathode terminal part, the anode terminal part and the cathode terminal part are electrically conducted with the aging device in the aging process, and the stacked capacitor cores can only be uniformly repaired according to the same aging procedure. However, because of the difference in the electrical properties of the capacitor cores, when the same aging process is used for uniformly aging a plurality of stacked capacitor cores, the conditions of insufficient aging or excessive aging of individual cores are easy to occur, when the aging is insufficient, dielectric defects of the cores are not completely repaired, the leakage current of the capacitor is large, when the aging is excessive, the conductive polymer layer is excessively oxidized and undoped to reduce the conductivity, and the ESR of the capacitor is increased, namely, the existing single lead-out mode of an anode terminal and a cathode terminal is insufficient in selectivity in the aging process, the repairing effect is poor, and the product performance can be deteriorated when the aging is serious;
2. the resin packaging generally adopts an injection molding process, namely, a liquid packaging material is injected into a packaging mold under the condition of high temperature and pressure, so that the packaging material can squeeze stacked capacitor cores or enter between stacked core layers in the injection molding process, so that leakage current and ESR of the product are increased, delamination is caused when serious, and the capacitor is invalid;
3. the resin shell formed by resin encapsulation is of a non-airtight structure, and under severe environments such as high temperature, high humidity and the like, water vapor or corrosive gas and liquid easily invade the inside of the capacitor, so that the performance of the product is deteriorated or even fails. In order to establish a graded aging process and customize an aging procedure according to the performance of a capacitor core, realize accurate aging repair of the capacitor core, improve the aging effect, improve the product yield and improve the product air tightness, and the solid aluminum electrolytic capacitor is required to be invented.
Disclosure of Invention
The invention aims to provide a solid aluminum electrolytic capacitor and a preparation method thereof, which are used for solving the technical problems.
In order to achieve the above purpose, the present invention provides the following technical solutions: the solid aluminum electrolytic capacitor comprises N capacitor cores, N-1 barrier layers, N-1 copper foils, an outer shell and a cover plate, wherein N capacitor cores are sequentially stacked and then are arranged in the outer shell to form a semi-finished capacitor product, the barrier layers and the copper foils are sequentially arranged between the cathode parts of two adjacent capacitor cores from bottom to top, and the cover plate is arranged on the semi-finished capacitor product in a covering manner and is sealed to form the solid aluminum electrolytic capacitor;
the inner cavity of the outer shell is divided into an anode cavity and a cathode cavity which are matched with the core shape of the capacitor by two baffle plates, N-1 support plates with gradually increasing heights are arranged on the side wall of the inner cavity of the cathode cavity and are connected with the bottom of the inner cavity of the outer shell, an anode electric connection part and a cathode electric connection part are respectively arranged at the bottoms of the inner cavities of the anode cavity and the cathode cavity, the cathode electric connection part comprises N cathode tongues with gradually increasing heights, N cathode connection parts and N cathode terminal parts, N cathode tongues, the cathode connection parts and the cathode terminal parts are connected in one-to-one correspondence and form independent conductive paths, the cathode tongues at the lowest part are embedded into the inner surface of the bottom of the inner cavity of the outer shell and are flush with the inner surface of the inner cavity of the outer shell, the rest cathode tongues are respectively embedded into the upper surface of the support plate with corresponding heights and are flush with the inner surface of the inner cavity of the outer shell, and N cathode connection parts are penetrated into the outer shell, and N cathode terminal parts are embedded into the outer surface of the bottom of the inner cavity of the outer shell and are flush with the outer surface of the inner cavity;
when the solid aluminum electrolytic capacitor is prepared, the cathode tongue part positioned at the lowest part is electrically connected with the cathode part of the capacitor core at the lowest part, the rest cathode tongue parts are electrically connected with copper foils with corresponding heights, and the anode electrical connection part is electrically connected with the anode part of the capacitor core.
Preferably, the solid aluminum electrolytic capacitor further comprises two rivets, the anode part of the capacitor core is provided with a circular through hole matched with the rivets, and the anode part of the capacitor core is electrically connected with the anode electric connection part through the rivets.
Preferably, the anode electric connection part comprises an anode tongue part, an anode connection part and an anode terminal part which are sequentially and vertically connected, the anode tongue part comprises a rectangular part, a pair of cylindrical positioning nails matched with the circular through holes are arranged on one side surface of the rectangular part away from the anode connection part, a circle of anode annular protruding parts are arranged in the middle of the anode connection part, the rectangular part in the anode tongue part is embedded into the inner surface of the bottom of the inner cavity of the outer shell and is flush with the inner surface of the bottom of the inner cavity of the outer shell, and the anode terminal part is embedded into the outer surface of the bottom of the inner cavity of the outer shell and is flush with the outer surface of the bottom of the inner cavity of the outer shell.
Preferably, the rectangular metal ring is fixedly arranged at the edge of the opening of the outer shell, a circle of protruding parts matched with the rectangular metal ring are arranged at the edge of the cover plate, which is close to one side face of the outer shell, and the cover plate is fixedly welded through the protruding parts and the rectangular metal ring in a sleeved mode.
Preferably, the width of the N-1 supporting plates is 5% -10% of the width of the bottom of the cavity of the outer shell, and the height difference between the supporting plates is the sum of the thicknesses of the monolithic capacitor cores and the monolithic barrier layers.
Preferably, the anode electrical connection part and the cathode electrical connection part are made of copper and copper alloy.
Preferably, the copper foil comprises a main body part and a protruding part, the protruding part is arranged at the side edge of the main body part and corresponds to the position of the supporting plate, the length of the main body part is less than or equal to 80% of the length of the cathode part of the capacitor core, the width of the main body part is less than or equal to 80% of the width of the cathode part of the capacitor core, and the thickness of the copper foil is 0.05mm.
Preferably, the length of the barrier layer is 1.1 times or more of the length of the cathode part of the capacitor core, the width of the barrier layer is 1.1 times or more of the width of the cathode part of the capacitor core, the barrier layer is made of polyimide fiber thin plates, and the thickness of the barrier layer is 0.05mm.
A method of manufacturing a solid aluminum electrolytic capacitor, the method comprising the steps of:
s1, respectively preparing N capacitor cores, N-1 barrier layers and N-1 copper foils according to the number of design layers;
s2, sequentially stacking and fixing the N prepared capacitor cores in the shell, and sequentially arranging a barrier layer and a copper foil between cathode parts of two adjacent capacitor cores from bottom to top to form a semi-finished capacitor product;
s3, the cover plate is covered on the outer shell, and airtight sealing is carried out between the peripheral cover plate and the outer shell through a parallel seam welding process, so that the solid aluminum electrolytic capacitor is manufactured.
Preferably, the step S2 specifically includes:
s201, a pair of circular through holes on the anode part of the first capacitor core are sleeved with cylindrical positioning nails on the anode tongue part to form electric connection, and the lower surface of the cathode part of the first capacitor core is adhered to the cathode tongue part positioned at the lowest part through conductive silver paste to realize the cathode extraction of the first capacitor core;
s202, placing a first barrier layer on the upper surface of the cathode part of the first capacitor core;
s203, bonding the lower surface of the main body part of the first copper foil with the upper surface of the first barrier layer through insulating glue, and bonding the lower surface of the protruding part of the first copper foil with the cathode tongue part with corresponding height through conductive silver glue;
s204, a pair of circular through holes on the anode part of the second capacitor core are sleeved with cylindrical positioning nails on the anode tongue part to form electric connection, and the lower surface of the cathode part of the second capacitor core is adhered with the upper surface of the main body part of the first copper foil through conductive silver paste to realize the cathode extraction of the second capacitor core;
s205, repeating the steps S202-S204N-2 times to realize the extraction of the cathodes of the third to N-th capacitor cores;
s206, driving rivets into holes of the cylindrical positioning nails, and fixing the rivets, the cylindrical positioning nails and anode parts of N capacitor cores through an ultrasonic welding process to form electric connection so as to realize anode extraction;
and S207, filling insulating sealant in the anode cavity of the outer shell and curing.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, a plurality of staggered support plates are arranged in a cathode cavity of an outer shell, a plurality of cathode lead-out sites are formed by matching with a cathode electric connection part consisting of a plurality of cathode tongues, a plurality of cathode connection parts and a plurality of cathode terminal parts, then a plurality of capacitor cores are assembled into the outer shell, a barrier layer and a copper foil are sequentially arranged between the cathode parts of two adjacent capacitor cores from bottom to top, and the copper foil is electrically connected with the corresponding support plates, so that independent lead-out of the cathodes of the single capacitor cores is realized; therefore, when the capacitor is subjected to aging repair, the solid aluminum electrolytic capacitor with a plurality of independent cathode terminals can be tested, the performance parameters of the single-chip capacitor core are obtained, a grading aging program is set according to the performance parameters, and the accurate aging repair of the capacitor core is realized by means of the aging device, so that the industrialization yield is improved;
2. the invention adopts the packaging mode of the shell and the cover plate, thereby avoiding the damage of injection molding pressure to the capacitor cores stacked by a plurality of pieces in the traditional resin packaging process and improving the air tightness of the capacitor;
3. the core leading-out mode can also bring convenience to product failure analysis, and the invention can quickly position the failure core by testing the performance of the single-chip capacitor core under the condition of not using a transmission characterization instrument or a physical dissection means, thereby providing a basis for accurately positioning and analyzing the failure point.
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 according to the present invention;
FIG. 2 is a structural cross-sectional view of the solid aluminum electrolytic capacitor of the present invention;
FIG. 3 is a schematic diagram of a semi-finished capacitor structure according to the present invention;
FIG. 4 is a schematic diagram of the structure of the semi-finished capacitor of the present invention with the outer casing removed;
FIG. 5 is a schematic view of a capacitor core structure according to the present invention;
FIG. 6 is a schematic view of the structure of a barrier layer according to the present invention;
FIG. 7 is a schematic view of the structure of a copper foil according to the present invention;
FIG. 8 is a schematic view of the structure of the outer shell according to the present invention;
FIG. 9 is a schematic view of the structure of the anode electrical connection part according to the present invention;
FIG. 10 is a schematic view of the structure of the cathode electrical connection part according to the present invention;
FIG. 11 is a schematic view of a cover plate according to the present invention;
FIG. 12 is a schematic view of a rivet according to the present invention;
FIG. 13 is a flowchart showing a method for manufacturing an aluminum electrolytic capacitor according to the present invention;
FIG. 14 is a schematic flow chart of a method of stacking cores in the manufacturing method of the present invention;
FIG. 15 is a schematic flow chart of a method for preparing a core according to an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a capacitor core; 11. a circular through hole; 2. a barrier layer; 3. copper foil; 31. a main body portion; 32. a protruding portion; 4. an outer housing; 41. a baffle plate; 42. a support plate; 43. an anode electrical connection; 431. an anode tongue; 4311. a rectangular portion; 4312. a cylindrical positioning pin; 432. an anode connection part; 4321. an anode annular projection; 433. an anode terminal portion; 44. a cathode electrical connection; 441. a cathode tongue; 442. a cathode connection portion; 443. a cathode terminal portion; 45. a rectangular metal ring; 5. a cover plate; 51. a protruding portion; 6. a rivet; 61. a round nut; 62. a cylindrical nail body.
Detailed Description
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. 1-12, the present invention provides a technical scheme (the scheme specifically is a structure of a solid aluminum electrolytic capacitor):
a solid aluminum electrolytic capacitor comprises N capacitor cores 1, N-1 separation layers 2, N-1 copper foils 3, an outer shell 4 and a cover plate 5,N capacitor cores 1, wherein the N capacitor cores 1, the N-1 separation layers 2, the N-1 copper foils 3, the outer shell 4 and the cover plate 5,N capacitor cores 1 are sequentially stacked and then are arranged in the outer shell 4 to form a semi-finished capacitor product, the separation layers 2 and the copper foils 3 are sequentially arranged between the cathode parts of two adjacent capacitor cores 1 from bottom to top, and the cover plate 5 is arranged on the semi-finished capacitor product in a covering manner and is sealed to form the solid aluminum electrolytic capacitor;
the two opposite side walls of the inner cavity of the outer shell 4 are symmetrically provided with baffle plates 41, the baffle plates 41 are connected with the bottom of the inner cavity of the outer shell 4, the two baffle plates 41 divide the inner cavity of the outer shell 4 into an anode cavity and a cathode cavity which are matched with the shape of the capacitor core 1, the side wall of the inner cavity of the cathode cavity is provided with N-1 support plates 42 with gradually increasing heights, the support plates 42 are connected with the bottom of the inner cavity of the outer shell 4, the bottoms of the inner cavities of the anode cavity and the cathode cavity are respectively provided with an anode electric connection part 43 and a cathode electric connection part 44, the cathode electric connection part 44 comprises N cathode tongues 441 with gradually increasing heights, N cathode connection parts 442 and N cathode terminal parts 443, the N cathode tongues 441, the cathode connection parts 442 and the cathode terminal parts 443 are connected in a one-to-one correspondence and form independent conductive paths, the cathode tongues 441 positioned at the bottom of the inner surface of the inner cavity of the outer shell 4 are embedded in the upper surfaces of the support plates 42 with the corresponding heights and are flush with the same, the N cathode connection parts 442 are arranged in the outer shell 4 in a penetrating way, the outer cavity 443 is flush with the outer surface of the bottom of the inner cavity of the outer shell 4;
in the production of the solid aluminum electrolytic capacitor, the cathode tongue 441 located at the lowermost position is electrically connected to the cathode portion of the capacitor element 1 at the lowermost position, the remaining cathode tongue 441 is electrically connected to the copper foil 3 at the corresponding height, and the anode electrical connection portion 43 is electrically connected to the anode portion of the capacitor element 1.
Specifically, the solid aluminum electrolytic capacitor further includes two rivets 6, the anode portion of the capacitor core 1 is provided with a circular through hole 11 which is mutually matched with the rivets 6, and the anode portion of the capacitor core 1 is electrically connected with the anode electrical connection portion 43 through the rivets 6.
Specifically, the anode electrical connection portion 43 includes an anode tongue portion 431, an anode connection portion 432 and an anode terminal portion 433 which are sequentially and vertically connected, the anode tongue portion 431 includes a rectangular portion 4311, a pair of cylindrical positioning nails 4312 matched with the circular through holes 11 are arranged on one side surface of the rectangular portion 4311 away from the anode connection portion 432, a circle of anode annular protruding portions 4321 are arranged in the middle of the anode connection portion 432, the rectangular portion 4311 in the anode tongue portion 431 is embedded into and flush with the inner surface of the bottom of the inner cavity of the outer shell 4, and the anode terminal portion 433 is embedded into and flush with the outer surface of the bottom of the inner cavity of the outer shell 4.
Specifically, the rectangular metal ring 45 is fixedly arranged at the open edge of the outer casing 4, a circle of protruding parts 51 matched with the rectangular metal ring 45 are arranged at the edge of the cover plate 5, which is close to one side surface of the outer casing 4, and the cover plate 4 is sleeved with the rectangular metal ring 45 through the protruding parts 51 and is welded and fixed.
Specifically, the width of each of the N-1 support plates 42 is 5% -10% of the width of the bottom of the inner cavity of the outer housing 4, and the height difference between the support plates 42 is the sum of the thicknesses of the monolithic capacitor core 1 and the monolithic barrier layer 2.
Specifically, the anode electrical connection portion 43 and the cathode electrical connection portion 44 are made of copper or a copper alloy.
Specifically, the copper foil 3 includes a main body 31 and a protrusion 32, the protrusion 32 is located at a side of the main body 31 and is disposed corresponding to the position of the support plate 42, the length of the main body 31 is equal to or less than 80% of the length of the cathode portion of the capacitor core 1, the width of the main body 31 is equal to or less than 80% of the width of the cathode portion of the capacitor core 1, and the thickness of the copper foil 3 is 0.05mm.
From the above description, it is clear that: the larger the contact area between the copper foil for extraction and the cathode part of the core is, the more favorable is the reduction of ESR, and the length and the width of the copper foil are respectively smaller than or equal to 80% of the length and the width of the capacitor core, so that the electric conduction between the capacitor cores caused by displacement when the copper foil is stacked can be avoided.
Specifically, the length of the barrier layer 2 is 1.1 times or more of the length of the cathode part of the capacitor core 1, the width of the barrier layer 2 is 1.1 times or more of the width of the cathode part of the capacitor core 1, the barrier layer 2 is made of polyimide fiber thin plates, and the thickness of the barrier layer 2 is 0.05mm.
From the above description, it is clear that: the area of the barrier layer is larger than the area of the cathode part of the core, and the dimension in the length-width direction is larger than that of the cathode part of the core so as to prevent the interlayer electrical connection of the core; and the maximum size of the barrier layer depends on the size of the space enclosed by barrier plate 41 and N-1 support plates in the outer housing cathode cavity;
referring to fig. 13-15, another technical scheme provided by the present invention (the scheme specifically is a preparation method of a solid aluminum electrolytic capacitor):
the preparation method of the solid aluminum electrolytic capacitor comprises the following steps:
s1, respectively preparing N capacitor cores 1, N-1 barrier layers 2 and N-1 copper foils 3 according to the number of design layers;
s2, sequentially stacking and fixing the N prepared capacitor cores 1 in the outer shell 4, and sequentially arranging a barrier layer 2 and a copper foil 3 between the cathode parts of two adjacent capacitor cores 1 from bottom to top to form a semi-finished capacitor product;
s3, the cover plate 5 is covered on the outer shell 4, and the peripheral cover plate 5 and the outer shell 4 are hermetically sealed through a parallel seam welding process, so that the solid aluminum electrolytic capacitor is manufactured.
Specifically, step S2 specifically includes:
s201, a pair of circular through holes 11 on the anode part of the first capacitor core 1 are sleeved with cylindrical positioning nails 4312 on the anode tongue 431 to form electric connection, and the lower surface of the cathode part of the first capacitor core 1 is adhered with the cathode tongue 441 positioned at the lowest part through conductive silver paste to realize the cathode extraction of the first capacitor core 1;
s202, placing a first barrier layer 2 on the upper surface of the cathode part of the first capacitor core 1;
s203, bonding the lower surface of the main body 31 of the first copper foil 3 with the upper surface of the first barrier layer 2 through insulating glue, and bonding the lower surface of the protruding part 32 of the first copper foil 3 with the cathode tongue 441 with corresponding height through conductive silver glue;
s204, a pair of circular through holes 11 on the anode part of the second capacitor core 1 are sleeved with cylindrical positioning nails 4312 on the anode tongue 431 to form electric connection, and the lower surface of the cathode part of the second capacitor core 1 is adhered with the upper surface of the main body part 31 of the first copper foil 3 through conductive silver paste to realize cathode extraction of the second capacitor core 1;
s205, repeating the steps S202-S204N-2 times to realize the extraction of the cathodes of the third to N-th capacitor cores 1;
s206, driving a rivet 6 into the hole of the cylindrical positioning nail 4312, and fixing the rivet 6, the cylindrical positioning nail 4312 and the anode part of the N capacitor cores 1 through an ultrasonic welding process to form electric connection so as to realize anode extraction;
and S207, filling insulating sealant in the anode cavity of the outer shell 4 and curing to form a semi-finished capacitor.
Referring to fig. 1-15, one embodiment of the present invention is as follows:
as shown in fig. 1, 2 and 3: a solid aluminum electrolytic capacitor comprises 4 capacitor cores 1, 3 barrier layers 2, 3 copper foils 3, an outer shell 4, a cover plate 5 and two rivets 6; the specific structure of each component is as follows:
as shown in fig. 5: the appearance shape of the capacitor core 1 is in an I shape which is axially symmetrical, and a pair of circular through holes 11 which are matched with the rivets 6 are formed in the anode part of the capacitor core 1;
as shown in fig. 4 and 6: the shape of the barrier layer 2 is rectangular, the length of the barrier layer 2 is 1.2 times of the length of the cathode part of the capacitor core 1, the width of the barrier layer 2 is 1.2 times of the width of the cathode part of the capacitor core 1, the barrier layer is made of polyimide fiber thin plates, and the thickness of the barrier layer is 0.05mm;
as shown in fig. 4 and 7: the copper foil 3 comprises a main body part 31 and a protruding part 32, the shape of the main body part 31 and the protruding part 32 is rectangular, the protruding part 32 is positioned at the side edge of the main body part 31 and is arranged corresponding to the position of the supporting plate 42, the length of the main body part 31 is 80% of the length of the cathode part of the capacitor core 1, the width of the main body part 31 is 80% of the width of the cathode part of the capacitor core 1, and the thickness of the copper foil 3 is 0.05mm;
as shown in fig. 8: the outer shell 4 is of a square open structure and is formed by encircling two symmetrically arranged long side plates, two symmetrically arranged short side plates and a bottom plate, the inner side walls of the two long side plates of the outer shell 4 are symmetrically connected with baffle plates 41, the height of each baffle plate 41 is equal to the height of each long side plate, the width of each baffle plate 41 is 10% -30% of the width of a bottom plate (20% in the embodiment), the two baffle plates 41 divide the inner cavity of the outer shell 4 into an anode cavity and a cathode cavity which are matched with the shape of a capacitor core 1, the bottoms of the inner cavities of the anode cavity and the cathode cavity are respectively provided with an anode electric connection part 43 and a cathode electric connection part 44, three support plates 42 are arranged on the side walls of the long side plates in the cathode cavity of the outer shell 4 (in the embodiment, the first support plates, the second support plates and the third support plates are sequentially recorded from low to high), the spacing distance is 15% -25% of the length of the cathode part of the capacitor core 1, the width of each support plate 42 is 5% -10% of the width of the bottom plate (8% of the embodiment is 20% of the length of the cathode part of the capacitor core 1), and the height of each support plate 42 is 0.80% of the side walls of the outer shell is 0.80%; the shell 4, the baffle plate 41 and the supporting plate 42 are made of alumina ceramic and are integrally formed, a rectangular metal ring 45 is fixedly arranged on the edge of the opening of the shell 4, and the rectangular metal ring 45 is made of Kovar alloy;
as shown in fig. 9: the anode electric connection part 43 comprises an anode tongue 431, an anode connection part 432 and an anode terminal part 433 which are vertically connected in sequence, the anode tongue 431 comprises a rectangular part 4311, one side surface of the rectangular part 4311 far away from the anode connection part 432 is provided with a pair of cylindrical positioning nails 4312 matched with the circular through holes 11, the middle part of the anode connection part 432 is provided with a circle of anode annular protruding parts 4321, the rectangular part 4311 in the anode tongue 431 is embedded into and leveled with the inner surface of the bottom of the inner cavity of the outer shell 4, the anode terminal part 433 is embedded into and leveled with the outer surface of the bottom of the inner cavity of the outer shell 4, and the surface of the anode terminal part 433 exposed out of the outer shell 4 is provided with a tin plating layer;
as shown in fig. 10: the cathode electric connection part 44 comprises 4 cathode tongues 441, 4 cathode connection parts 442 and 4 cathode terminal parts 443, wherein the 4 cathode tongues 441 are sequentially named as a first cathode tongue, a second cathode tongue, a third cathode tongue and a fourth cathode tongue from low to high, the first cathode tongue is embedded in the inner surface of the bottom of the inner cavity of the outer shell 4 and is flush with the inner surface of the inner cavity, the second cathode tongue is embedded in the upper surface of the first support plate and is flush with the upper surface of the second support plate, the third cathode tongue is embedded in the upper surface of the third support plate and is flush with the upper surface of the third support plate; the 4 cathode connection parts 442 are all penetrated in the outer shell 4, and the cathode connection parts 442 are hidden in the outer shell 4 and are not visible; the shape of the 4 cathode terminal portions 443 is rectangular which are arranged at equal intervals, the distance between two adjacent cathode terminal portions 443 is 5% -10% of the width of the bottom plate of the outer shell 4 (8% in the embodiment), the 4 cathode terminal portions 443 are embedded into and flush with the outer surface of the bottom of the inner cavity of the outer shell 4, and tin plating layers are arranged on the surfaces of the cathode terminal portions 443 exposed out of the outer shell 4;
as shown in fig. 11: the edge of the cover plate 5, which is close to one side surface of the outer shell 4, is provided with a circle of protruding parts 51 matched with the rectangular metal ring 45, the cover plate 5 is sleeved and welded and fixed with the rectangular metal ring 45 through the protruding parts 51, and the cover plate 5 is made of metal.
As shown in fig. 12, the rivet 6 comprises a circular nut 61 and a cylindrical nail body 62 which are mutually connected and matched with the circular through hole 11, the diameter of the circular nut 61 is larger than that of the cylindrical nail body 62, one end of the cylindrical nail body 62 far away from the circular nut 61 is in a conical structure, namely, the conical end of the rivet 6 is driven into a hole of the cylindrical positioning nail 4312, and the rivet 6 is made of copper or copper alloy;
as shown in fig. 13 to 15, the preparation method of the capacitor is as follows:
s1, respectively preparing 4 capacitor cores 1, 3 barrier layers 2 and 3 copper foils 3 according to the number of design layers, wherein the preparation method of the capacitor core 1 specifically comprises the following steps:
s101, punching and cutting a formed aluminum foil into an I shape formed by a first rectangular part and a second rectangular part which are distributed at two ends and are wider, and a narrower rectangular connecting part positioned in the middle, wherein the first rectangular part and the second rectangular part are equal in width, the width of the rectangular connecting part is 60% of the width of the first rectangular part, and a pair of circular through holes 11 are punched in the second rectangular part to form a first aluminum foil;
s102, coating insulating barrier adhesive on the upper surface, the lower surface and the two side edges of a rectangular connecting part of a first aluminum foil, preparing the insulating barrier adhesive tape, dividing the first rectangular part into cathode parts, and dividing the second rectangular part into anode parts to form a second aluminum foil;
s103, carrying out reformation and repair treatment on the cathode part side dielectric layer of the second aluminum foil to form a third aluminum foil;
s104, forming a conductive polymer layer on the surface of the cathode part of the third aluminum foil to obtain a fourth aluminum foil;
s105, dipping a cathode part of the fourth aluminum foil into conductive graphite emulsion, and drying to form a conductive carbon slurry layer to obtain a fifth aluminum foil;
s106, dipping the cathode part of the fifth aluminum foil into conductive silver paste, and drying to form a conductive silver paste layer to obtain a capacitor core 1;
s2, sequentially stacking and fixing the 4 prepared capacitor cores 1 in the outer shell 4, and sequentially arranging a barrier layer 2 and a copper foil 3 between the cathode parts of two adjacent capacitor cores 1 from bottom to top to form a semi-finished capacitor product;
the stacking step is specifically as follows:
s201, a pair of circular through holes 11 on the anode part of the first capacitor core 1 are sleeved with cylindrical positioning nails 4312 on the anode tongue 431 to form electric connection, and the lower surface of the cathode part of the first capacitor core 1 is adhered with the first cathode tongue through conductive silver paste to realize the cathode extraction of the first capacitor core 1;
s202, placing a first barrier layer 2 on the upper surface of the cathode part of the first capacitor core 1;
s203, bonding the lower surface of the main body 31 of the first copper foil 3 with the upper surface of the first barrier layer 2 through insulating glue, and bonding the lower surface of the protruding part 32 of the first copper foil 3 with the second cathode tongue through conductive silver glue;
s204, a pair of circular through holes 11 on the anode part of the second capacitor core 1 are sleeved with cylindrical positioning nails 4312 on the anode tongue 431 to form electric connection, and the lower surface of the cathode part of the second capacitor core 1 is adhered with the upper surface of the main body part 31 of the first copper foil 3 through conductive silver paste to realize cathode extraction of the second capacitor core 1;
s205, placing a second barrier layer 2 on the upper surface of the cathode part of the second capacitor core 1;
s206, bonding the lower surface of the main body 31 of the second copper foil 3 with the upper surface of the second barrier layer 2 through insulating glue, and bonding the lower surface of the protruding part 32 of the second copper foil 3 with the third cathode tongue through conductive silver glue;
s207, a pair of circular through holes 11 on the anode part of the third capacitor core 1 are sleeved with cylindrical positioning nails 4312 on the anode tongue 431 to form electric connection, and the lower surface of the cathode part of the third capacitor core 1 is adhered with the upper surface of the main body part 31 of the second copper foil 3 through conductive silver paste to realize the cathode extraction of the third capacitor core 1;
s208, placing a third barrier layer 2 on the upper surface of the cathode part of the third capacitor core 1;
s209, bonding the lower surface of the main body 31 of the third copper foil 3 with the upper surface of the third barrier layer 2 through insulating glue, and bonding the lower surface of the protruding part 32 of the third copper foil 3 with the fourth cathode tongue through conductive silver glue;
s210, a pair of circular through holes 11 on the anode part of the fourth capacitor core 1 are sleeved with cylindrical positioning nails 4312 on the anode tongue 431 to form electric connection, and the lower surface of the cathode part of the fourth capacitor core 1 is adhered with the upper surface of the main body part 31 of the third copper foil 3 through conductive silver paste to realize the cathode extraction of the fourth capacitor core 1;
s211, driving a rivet 6 into a hole of the cylindrical positioning nail 4312, and fixing the rivet 6, the cylindrical positioning nail 4312 and the anode part of the 4 capacitor cores 1 through an ultrasonic welding process to form electric connection so as to realize anode extraction;
s212, filling insulating sealant in the anode cavity of the outer shell 4 and curing to form a semi-finished capacitor;
s3, covering the cover plate 5 on the outer shell 4 of the semi-finished capacitor, and hermetically sealing the peripheral cover plate 5 and the outer shell 4 through a parallel seam welding process to manufacture the solid aluminum electrolytic capacitor.
Meanwhile, after the capacitor is prepared, the capacitor is subjected to subsequent testing and aging treatment as follows:
s4, testing the solid aluminum electrolytic capacitor to obtain the performance parameters of the single-chip capacitor core 1, and setting a grading aging program according to the performance parameters of the capacitor core 1;
s5, placing the solid aluminum electrolytic capacitor in an aging device, and accurately aging and repairing the single-chip capacitor core according to a set grading aging procedure.
As a comparative example of the present invention, a conventional solid aluminum electrolytic capacitor was prepared as follows:
s1, cutting the formed aluminum foil into long strips to form a first aluminum foil;
s2, coating insulating barrier glue on the first aluminum foil, and dividing an anode part and a cathode part to form a second aluminum foil;
s3, carrying out reformation and repair treatment on the side dielectric layer of the cathode part of the second aluminum foil to form a third aluminum foil;
s4, forming a conductive polymer layer on the surface of the cathode part of the third aluminum foil to obtain a fourth aluminum foil;
s5, dipping the cathode part of the fourth aluminum foil into conductive graphite emulsion, and drying to form a conductive carbon slurry layer to obtain a fifth aluminum foil;
s6, dipping the cathode part of the fifth aluminum foil into conductive silver paste, and drying to form a conductive silver paste layer to obtain a capacitor core;
s7, stacking 4 capacitor cores on the front side and the back side of the peripheral plane lead frame in sequence, wherein the anode part of the core is electrically connected with the peripheral plane lead frame in a welding mode, and the cathode part of the core is electrically connected with the peripheral plane lead frame in a conductive silver adhesive mode to form a capacitor core package;
and S8, packaging and curing the capacitor core package through epoxy resin, and bending the lead wires exposed out of the resin shell to form pins to obtain the solid aluminum electrolytic capacitor.
S9, placing the solid aluminum electrolytic capacitor in an aging device, and uniformly aging and repairing the capacitor according to a set aging procedure.
Compared with the conventional solid aluminum electrolytic capacitor, the aluminum electrolytic capacitor of the invention is different in that:
1. the cathode parts of a plurality of stacked capacitor cores in the common chip type laminated solid aluminum electrolytic capacitor are electrically conducted, the cathode parts of the capacitor cores are electrically connected with a single cathode terminal part, and the cathode parts of the capacitor cores are uniformly led out; the invention adopts a plurality of ceramic shells with a plurality of cathode extraction sites, and realizes independent extraction of the cathode parts of the capacitor cores by sequentially stacking a barrier layer and a copper foil between the cathode parts of two adjacent capacitor cores;
2. the common chip type laminated solid aluminum electrolytic capacitor is generally packaged by resin through an injection molding process, and in the injection molding process, liquid packaging materials directly contact with the capacitor cores, so that a plurality of stacked capacitor cores are damaged; according to the invention, the metal cover plate is connected with the rectangular metal ring in the ceramic outer shell through a parallel seam welding process, so that airtight packaging is realized, and shell materials cannot be contacted with the capacitor core in the packaging process;
compared with the existing chip type laminated solid aluminum electrolytic capacitor, the invention has the following beneficial effects:
1. a plurality of support plates which are staggered in height are arranged in the cathode cavity of the ceramic shell, and a plurality of cathode lead-out sites are arranged on the cathode electric connection part which is matched with the cathode electric connection part and consists of a plurality of cathode tongues, a plurality of cathode connection components and a plurality of cathode terminal parts. The independent extraction of the cathodes of the capacitor cores is realized by stacking a barrier layer and a copper foil between the cathodes of two adjacent capacitor cores in sequence and electrically conducting the copper foil with the corresponding support plate.
2. The performance parameters of the monolithic capacitor core can be obtained by testing the solid aluminum electrolytic capacitor with a plurality of independent cathode terminal parts, and the grading aging procedure can be set according to the performance parameters, so that the precise aging repair of the monolithic capacitor core is realized by means of the aging device, the aging repair effect is improved, and the yield of the solid aluminum electrolytic capacitor is improved.
3. When the product fails, the failure range is rapidly positioned by testing the performance of the single-chip capacitor core, so that a basis is provided for accurately positioning the failure point.
4. The metal cover plate and the rectangular metal ring in the ceramic outer shell are connected, so that damage of injection molding pressure to a plurality of stacked capacitor cores in the traditional resin packaging process is avoided, and the air tightness of the capacitor is improved.
In the description of the present invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
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. A solid aluminum electrolytic capacitor, characterized in that: the capacitor comprises N capacitor cores (1), N-1 separation layers (2), N-1 copper foils (3), an outer shell (4) and a cover plate (5), wherein N capacitor cores (1) are sequentially stacked and then are arranged in the outer shell (4) to form a semi-finished capacitor product, the separation layers (2) and the copper foils (3) are sequentially arranged between the cathode parts of two adjacent capacitor cores (1) from bottom to top, and the cover plate (5) is arranged on the semi-finished capacitor product in a covering mode and is sealed to form a solid aluminum electrolytic capacitor;
the inner cavity of the outer shell (4) is divided into an anode cavity and a cathode cavity which are matched with the capacitor core (1) in shape by the two baffle plates (41), the side wall of the inner cavity of the cathode cavity is provided with N-1 supporting plates (42) with gradually increasing heights, the supporting plates (42) are connected with the bottom of the inner cavity of the outer shell (4), the bottoms of the inner cavities of the anode cavity and the cathode cavity are respectively provided with an anode electric connecting part (43) and a cathode electric connecting part (44), the cathode electric connecting part (44) comprises N cathode tongues (441), N cathode connecting parts (442) and N cathode terminal parts (443) with gradually increasing heights, the N cathode tongues (441), the cathode connecting parts (442) and the cathode terminal parts (443) are connected in a one-to-one correspondence manner and form independent conductive paths, the cathode tongues (441) positioned at the lowest are embedded into the inner surface of the inner cavity bottom of the outer shell (4) and are embedded into the surfaces of the rest of the inner cavity of the outer shell (4) and are flush with the rest of the cathode tongues (441) which are respectively embedded into the surfaces of the outer shell (442) in a flush manner, n cathode terminal parts (443) are embedded into the outer surface of the bottom of the inner cavity of the outer shell (4) and are flush with the outer surface;
when the solid aluminum electrolytic capacitor is manufactured, the cathode tongue (441) positioned at the lowest part is electrically connected with the cathode part of the capacitor core (1) at the lowest part, the rest of the cathode tongues (441) are electrically connected with copper foils (3) with corresponding heights, and the anode electrical connection part (43) is electrically connected with the anode part of the capacitor core (1).
2. The solid aluminum electrolytic capacitor according to claim 1, wherein: the solid aluminum electrolytic capacitor further comprises two rivets (6), a circular through hole (11) matched with the rivets (6) is formed in the anode part of the capacitor core (1), and the anode part of the capacitor core (1) is electrically connected with an anode electrical connection part (43) through the rivets (6).
3. A solid state aluminum electrolytic capacitor as claimed in claim 2, wherein: the positive pole electricity connecting portion (43) is including perpendicular positive pole tongue (431), positive pole connecting portion (432), positive pole terminal portion (433) that connect gradually, positive pole tongue (431) are including rectangle portion (4311), one side that positive pole connecting portion (432) was kept away from to rectangle portion (4311) is provided with a pair of cylinder locating nail (4312) that match with circular through-hole (11), the middle part of positive pole connecting portion (432) is provided with round positive pole annular protruding portion (4321), the internal surface of the inner chamber bottom of shell body (4) is embedded into and is parallel and level with it in rectangle portion (4311) in positive pole tongue (431), the surface of the inner chamber bottom of shell body (4) is embedded into and is parallel and level with it in positive pole terminal portion (433).
4. The solid aluminum electrolytic capacitor according to claim 1, wherein: the rectangular metal ring (45) is fixedly arranged on the open edge of the outer shell (4), a circle of protruding parts (51) matched with the rectangular metal ring (45) are arranged on the edge, close to one side face of the outer shell (4), of the cover plate (5), and the cover plate (5) is sleeved with the rectangular metal ring (45) through the protruding parts (51) and is welded and fixed.
5. The solid aluminum electrolytic capacitor according to claim 1, wherein: the width of the N-1 supporting plates (42) is 5% -10% of the width of the bottom of the inner cavity of the outer shell (4), and the height difference between the supporting plates (42) is the sum of the thicknesses of the monolithic capacitor core (1) and the monolithic barrier layer (2).
6. The solid aluminum electrolytic capacitor according to claim 1, wherein: the anode electrical connection part (43) and the cathode electrical connection part (44) are made of copper and copper alloy.
7. The solid aluminum electrolytic capacitor according to claim 1, wherein: the copper foil (3) comprises a main body part (31) and a protruding part (32), the protruding part (32) is arranged on the side edge of the main body part (31) and corresponds to the position of the supporting plate (42), the length of the main body part (31) is smaller than or equal to 80% of the length of the cathode part of the capacitor core (1), the width of the main body part (31) is smaller than or equal to 80% of the width of the cathode part of the capacitor core (1), and the thickness of the copper foil (3) is 0.05mm.
8. The solid aluminum electrolytic capacitor according to claim 1, wherein: the length of the barrier layer (2) is greater than or equal to 1.1 times of the length of the cathode part of the capacitor core (1), the width of the barrier layer (2) is greater than or equal to 1.1 times of the width of the cathode part of the capacitor core (1), the barrier layer (2) is made of polyimide fiber thin plates, and the thickness of the barrier layer (2) is 0.05mm.
9. A method for manufacturing a solid aluminum electrolytic capacitor as claimed in any one of claims 1 to 8, characterized in that: the preparation method comprises the following steps:
s1, respectively preparing N capacitor cores (1), N-1 barrier layers (2) and N-1 copper foils (3) according to the number of design layers;
s2, sequentially stacking and fixing the N prepared capacitor cores (1) in the outer shell (4), and sequentially arranging a barrier layer (2) and a copper foil (3) between cathode parts of two adjacent capacitor cores (1) from bottom to top to form a semi-finished capacitor;
s3, a cover plate (5) is covered on the outer shell (4), and airtight sealing is carried out between the peripheral cover plate (5) and the outer shell (4) through a parallel seam welding process, so that the solid aluminum electrolytic capacitor is manufactured.
10. The method for manufacturing a solid aluminum electrolytic capacitor according to claim 9, wherein: the step S2 specifically comprises the following steps:
s201, a pair of circular through holes (11) on the anode part of a first capacitor core (1) are sleeved with cylindrical positioning nails (4312) on an anode tongue part (431) to form electric connection, and the lower surface of the cathode part of the first capacitor core (1) is adhered to the cathode tongue part (441) positioned at the lowest part through conductive silver paste to realize cathode extraction of the first capacitor core (1);
s202, placing a first barrier layer (2) on the upper surface of a cathode part of a first capacitor core (1);
s203, bonding the lower surface of the main body part (31) of the first copper foil (3) with the upper surface of the first barrier layer (2) through insulating glue, and bonding the lower surface of the protruding part (32) of the first copper foil (3) with the cathode tongue part (441) with corresponding height through conductive silver glue;
s204, a pair of circular through holes (11) on the anode part of the second capacitor core (1) are sleeved with cylindrical positioning nails (4312) on the anode tongue part (431) to form electric connection, and the lower surface of the cathode part of the second capacitor core (1) is adhered to the upper surface of the main body part (31) of the first copper foil (3) through conductive silver paste to realize cathode extraction of the second capacitor core (1);
s205, repeating the steps S202-S204N-2 times to realize the extraction of the cathodes of the third to N-th capacitor cores (1);
s206, driving a rivet (6) into a hole of the cylindrical positioning nail (4312), and fixing and electrically connecting the rivet (6), the cylindrical positioning nail (4312) and the anode part of the N-piece capacitor core (1) through an ultrasonic welding process to realize anode extraction;
and S207, filling insulating sealant in the anode cavity of the outer shell (4) and curing to form a semi-finished capacitor.
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| 阳极处理改善聚吡咯片式叠层铝电容器漏电流;程云来;潘德源;王在安;;电子元件与材料;20080315(第03期);全文 * |
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