CN117438218A - Solid aluminum capacitor and preparation method thereof - Google Patents

Solid aluminum capacitor and preparation method thereof Download PDF

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Publication number
CN117438218A
CN117438218A CN202311196460.1A CN202311196460A CN117438218A CN 117438218 A CN117438218 A CN 117438218A CN 202311196460 A CN202311196460 A CN 202311196460A CN 117438218 A CN117438218 A CN 117438218A
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CN
China
Prior art keywords
capacitor
foil
electrode
electrode foil
solid aluminum
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Pending
Application number
CN202311196460.1A
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Chinese (zh)
Inventor
李贡玉
华腾飞
曾蓉
秦钟华
陈新华
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State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
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State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
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Application filed by State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd filed Critical State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
Priority to CN202311196460.1A priority Critical patent/CN117438218A/en
Publication of CN117438218A publication Critical patent/CN117438218A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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 OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
    • H01G13/006—Apparatus or processes for applying terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
    • H01G13/04—Drying; Impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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 OR LIGHT-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
    • H01G9/022—Electrolytes; Absorbents
    • H01G9/025—Solid electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

The application relates to the technical field of capacitors, and provides a solid aluminum capacitor and a preparation method thereof, wherein the solid aluminum capacitor comprises: a capacitor body, the capacitor body comprising: the electrode foil layer body comprises a plurality of layers of electrode foils which are stacked, and the polarities of two adjacent layers of electrode foils are opposite; the electrolytic paper layer body is of a laminated structure, and an electrode foil is arranged between two adjacent layers; the conductive component comprises a plurality of conductive pieces, the plurality of conductive pieces are respectively and correspondingly connected with the plurality of electrode foils, and the conductive pieces are arranged in a way of protruding the electrode foils locally to form protruding sections; the protruding sections on the electrode foils with the same polarity are fixedly connected to form at least two conductive sections with different polarities. Through the technical scheme of the application, the manufacturing of the high-voltage large-size chip type solid aluminum electrolytic capacitor can be realized, the high-voltage large-size chip type solid aluminum electrolytic capacitor can be applied to a narrower space compared with a winding type solid aluminum electrolytic capacitor, and products with higher rated voltage and better reliability can be manufactured compared with a laminated type solid aluminum electrolytic capacitor.

Description

Solid aluminum capacitor and preparation method thereof
Technical Field
The application relates to the technical field of capacitors, in particular to a solid aluminum capacitor and a preparation method thereof.
Background
The traditional laminated solid aluminum electrolytic capacitor is rectangular, an anode aluminum foil is cut into aluminum foil sheets with required shapes through mechanical cutting and die punching, and isolation glue is coated on certain positions of the aluminum foil sheets to separate positive and negative electrode areas of products; then, the product coated with the isolation glue is subjected to compensation formation; preparing cathode electrolyte in the cathode region of the product, coating a graphite layer on the surface of a conductive polymer cathode polymerization layer, coating a high-conductivity silver paste layer on the graphite layer, and leading out the cathode of the capacitor by coating graphite and silver paste on the conductive polymer, wherein the manufacturing of the single chip core is completed.
According to the capacity design requirement of the product, stacking the single-chip cores covered with graphite and silver paste layers, wherein in the stacking process, the positive electrode parts of the single-chip cores are electrically connected with the lead frame by resistance welding or laser welding, and the negative electrode parts are electrically connected by bonding silver paste with high conductivity and applying certain temperature and pressure.
In the prior art, the manufacturing of the high-voltage laminated solid aluminum electrolytic capacitor is difficult. The reason for this is: if a laminated solid aluminum electrolytic capacitor with higher rated voltage is to be prepared, firstly, an aluminum foil with higher withstand voltage is required to be selected, but as the withstand voltage of the aluminum foil is increased, the thickness of an oxide layer of the aluminum foil is increased, and the existing welding technology cannot ensure good welding of the anode; secondly, as the rated voltage of the product is increased and the size of the product is increased, the conductive polymer layer, the graphite layer and the silver paste layer at the cathode part of the product are unevenly coated, the stacked product is uneven, breakdown short circuit is easy to occur after the power is applied, the qualification rate of the product is extremely low, and the reliability is poor.
Disclosure of Invention
The technical problem to be solved by the application is to provide a solid aluminum capacitor and a preparation method thereof, which can realize the manufacture of a high-voltage large-size chip solid aluminum electrolytic capacitor, can be applied to a narrower space compared with a winding solid aluminum electrolytic capacitor, and can manufacture products with higher rated voltage and better reliability compared with a laminated solid aluminum electrolytic capacitor.
In order to solve the technical problems, the application adopts the following technical scheme:
in a first aspect, the present application provides a solid aluminum capacitor comprising: a capacitor body, the capacitor body comprising: the electrode foil layer body comprises a plurality of layers of electrode foils which are stacked, and the polarities of the two adjacent layers of electrode foils are opposite; the electrolyte paper layer body is of a laminated structure, and the electrode foil is arranged between two adjacent layers; the conductive component comprises a plurality of conductive pieces, the plurality of conductive pieces are respectively and correspondingly connected with the plurality of electrode foils, and the conductive pieces are locally protruded from the electrode foils to form protruding sections; wherein, the protruding section on a plurality of same polarity electrode foils is fixed connection to form two at least different polarity electrically conductive sections.
As an embodiment, the electrode foil comprises a first sub-electrode foil and a second sub-electrode foil, the polarities of the first sub-electrode foil and the second sub-electrode foil being opposite.
As one embodiment, the electrolytic paper layer body comprises a plurality of layers of electrolytic paper which are stacked, each layer comprises at least one piece of electrolytic paper, and the first sub-electrode foil or the second sub-electrode foil is arranged between two adjacent layers.
As one embodiment, the electrolytic paper layer body comprises at least one piece of electrolytic paper, and the electrolytic paper is continuously bent and arranged, so that the electrolytic paper forms a laminated structure, and the first sub-electrode foil or the second sub-electrode foil is arranged between two adjacent layers.
As one embodiment, the solid aluminum capacitor further comprises a fixing member wound around the outer surface of the capacitor body.
As an implementation mode, the solid aluminum capacitor further comprises at least one positive electrode lead-out and at least one negative electrode lead-out, wherein the positive electrode lead-out and the negative electrode lead-out are respectively fixedly connected with the conductive segments with the same polarity.
As one embodiment, the solid aluminum capacitor further comprises a conductive polymer layer penetrating the electrolytic paper and covering the outer surface of the plurality of layers of the electrode foil.
As an implementation mode, the solid aluminum capacitor further comprises two hard supporting insulating pieces, wherein the two insulating pieces are respectively arranged at two ends of the capacitor body in the stacking direction, and the two insulating pieces are respectively attached to the fixing piece and the electrolytic paper layer body.
As an embodiment, the solid aluminum capacitor further comprises a package body, and the package body is arranged on the outer surfaces of the insulating piece, the capacitor body and part of the protruding section.
As an embodiment, the first sub-electrode foil is a positive electrode foil, the positive electrode foil is an aluminum foil, the second sub-electrode foil is a negative electrode foil, and the negative electrode foil is one of an aluminum foil, a carbon foil or a titanium foil, or; the first sub-electrode foil is a negative electrode foil, the negative electrode foil is one of an aluminum foil, a carbon foil or a titanium foil, the second sub-electrode foil is a positive electrode foil, and the positive electrode foil is an aluminum foil.
As an embodiment, the at least two conductive segments with different polarities are arranged in a protruding manner towards the same direction, or alternatively; the at least two conductive segments with different polarities are arranged in a protruding mode towards different directions.
In a second aspect, the present application provides a method for preparing a solid aluminum capacitor as provided in the first aspect, including the steps of:
s1, arranging a conductive piece on each layer of electrode foil through riveting, so that the conductive piece protrudes out of the electrode foil of the corresponding layer;
s2, arranging electrode foils between two adjacent layers of stacked electrolytic paper, wherein the polarities of the electrode foils of the two adjacent layers are different;
and S3, fixedly connecting the multilayer electrode foil and the electrolytic paper into a whole to obtain the capacitor body.
In one embodiment, in step S2, the electrode foil and the electrolytic paper are cut into any desired shape by means of mechanical cutting, die cutting or laser cutting.
As an embodiment, the preparation method further includes step S4: and the positive electrode conducting pieces of the solid aluminum capacitor body are all fixed on an iron bar or a steel bar through welding.
As an embodiment, the preparation method further includes step S5: the solid aluminum capacitor fixed on the iron or steel bar is formed and impregnated with the conductive high polymer.
As an embodiment, the preparation method further includes step S6: the positive electrode conductive piece and the negative electrode conductive piece are trimmed to conductive sections with required lengths, and are respectively and firmly connected with the lugs through resistance welding or laser welding so as to serve as positive electrode lead-out and negative electrode lead-out of the solid aluminum capacitor.
As an embodiment, the preparation method further includes step S7: and the aluminum plastic film is matched with the tab glue to form the sealed capacitor body of the packaging body.
The technical scheme of the application has the following beneficial effects:
1. the capacitor body comprises an electrode foil layer body and an electrolyte layer body, the electrode foil layer body comprises electrode foils which are arranged in a multi-layer lamination mode, the polarities of the electrode foils of two adjacent layers are opposite, and the electrode foils are spaced apart through the electrolyte layer body of the lamination structure, so that the solid aluminum capacitor is characterized in that the solid aluminum capacitor can be applied in a narrower space compared with the traditional winding type solid aluminum capacitor, conductive pieces are arranged on each layer of electrode foil, the electrode foils are locally protruded, the protruding portions are arranged, at least two conductive segments with different polarities are obtained by arranging and combining the protruding portions according to the requirement, and the protruding portions are led out and welded with the positive electrode and the negative electrode to obtain the positive electrode and the negative electrode of the capacitor. The method ensures that the anode foil with thick oxide layer can be well contacted with the conductive piece in the process of establishing the electric connection between the conductive piece and the electrode foil, thereby obtaining positive and negative electrodes of the capacitor with firm contact and good lead-out. Secondly, electrode foils with different polarities are isolated by using electrolytic paper, so that the risk of short circuit of the anode and the cathode of the capacitor is reduced. Thus, the solid aluminum electrolytic capacitor with higher rated voltage and better reliability can be obtained by the method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of one stacking manner of an electrolytic paper layer body and an electrode foil layer body provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another stacking method of an electrolytic paper layer and an electrode foil layer according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of an electrolytic paper layer body and an electrode foil layer body in a stacking manner when the electrolytic paper layer body is continuously bent;
FIG. 4 is a schematic structural diagram of another stacking method of the electrolyte paper layer and the electrode foil layer when the electrolyte paper layer is continuously bent according to the embodiment of the present application;
fig. 5 is a front view of a capacitor body provided in an embodiment of the present application;
fig. 6 is a side view of a capacitor body provided in an embodiment of the present application;
fig. 7 is a front view of a capacitor body with a conductive member trimmed to a conductive segment in accordance with an embodiment of the present application;
fig. 8 is a side view of a capacitor body with a conductive member trimmed to a conductive segment in accordance with an embodiment of the present application;
FIG. 9 is a side view of the electrode foil arrangement during stacking of the capacitor body provided in FIG. 4;
fig. 10 is a front view of a solid aluminum capacitor without sealing and mounting insulation provided in an embodiment of the present application;
FIG. 11 is a side view of a solid aluminum capacitor without a sealed, uninstalled insulation provided in an embodiment of the present application;
FIG. 12 is a side view of an unsealed, insulator-mounted solid aluminum capacitor provided in an embodiment of the present application;
FIG. 13 is a front view of a solid aluminum capacitor sealed by a package provided in an embodiment of the present application;
fig. 14 is a side view of a solid aluminum capacitor sealed by a package provided in an embodiment of the present application.
Icon: 1-electrolysis paper; 2-a first sub-electrode foil; 3-a second sub-electrode foil; 4-conductive members; 41-protruding extension; 42-conducting segments; 5-fixing pieces; 6-leading out the positive electrode and the negative electrode; 7-insulating member.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 5 to 9, in a first aspect, an embodiment of the present application provides a solid aluminum capacitor, including a capacitor body, where the capacitor body includes an electrode foil layer body, the electrode foil layer body includes a plurality of electrode foils that are stacked, and polarities of two adjacent electrode foils are opposite, and the capacitor body further includes an electrolytic paper layer body, where the electrolytic paper layer body is a stacked structure, and the electrode foils are disposed between the two adjacent layers, so that the two adjacent electrode foils with different polarities are spaced apart, preventing shorting of the positive and negative electrode lead-out 6, and improving reliability of the capacitor; the solid aluminum capacitor further comprises a conductive component, the conductive component comprises a plurality of conductive pieces 4, the number of the conductive pieces 4 corresponds to the number of the electrode foils, in addition, the polarity of the conductive pieces 4 corresponds to the polarity of the connected electrode foils, the conductive pieces 4 are correspondingly and electrically connected with the electrode foils, the electrode foils are locally protruded and stretched to form protruding sections 41 of the conductive pieces 4, the protruding sections 41 are arranged and combined according to requirements to obtain at least two conductive sections 42 with different polarities, and the conductive sections 42 are welded with the positive electrode lead-out 6 and the negative electrode lead-out 6 to obtain the positive electrode and the negative electrode of the solid aluminum capacitor. In the embodiment of the application, a riveting mode is adopted in the electric connection creation process of the conductive piece 4 and the electrode foil, and the anode foil with the thick oxide layer can be well contacted with the conductive piece 4, so that the positive electrode and the negative electrode of the capacitor with firm contact and good extraction are obtained. Secondly, the electrolytic paper 1 is used for isolating electrode foils with different polarities, so that the risk of shorting the anode and the cathode of the capacitor is reduced. Thus, the solid aluminum electrolytic capacitor with higher rated voltage and better reliability can be obtained by the method.
Optionally, according to the application embodiment, two leads with different polarities, four leads or more leads can be designed according to the use requirement of an actual product.
As shown in fig. 6 and 8, alternatively, a plurality of protruding segments 41 of the same polarity may be fixedly connected together by resistance welding or laser welding to form the conductive segments 42.
Alternatively, the plurality of electrode foils are divided into positive electrode foils and negative electrode foils, the protruding sections 41 of the conductive members 4 connected with the plurality of positive electrode foils are fixedly connected to form the conductive sections 42 of the positive electrodes of the capacitor, and the protruding sections 41 of the conductive members 4 connected with the plurality of negative electrode foils are fixedly connected to form the conductive sections 42 of the negative electrodes of the capacitor.
Alternatively, one of the two adjacent electrode foils may be a positive electrode and the other may be a negative electrode in the top-to-bottom direction of the electrode foil layer, and of course, one of the electrode foils may be a negative electrode and the other may be a positive electrode.
Alternatively, the conductive member 4 is electrically connected to the electrode foil by riveting, and the conductive member 4 may be a lead pin or a foil strip.
Alternatively, the conductive member 4 representing the positive electrode may have a longer length than the conductive member 4 representing the negative electrode, or the conductive member 4 representing the negative electrode may be provided with a pattern, so that the positive electrode and the negative electrode can be distinguished.
As shown in fig. 1 to 4, as an embodiment, the electrode foil includes a first sub-electrode foil 2 and a second sub-electrode foil 3, and the polarities of the first sub-electrode foil 2 and the second sub-electrode foil 3 are opposite, so that the opposite polarities of two adjacent electrode foils are realized, and the first sub-electrode foil 2 and the second sub-electrode foil 3 are prevented from contacting each other by the electrolytic paper 1 to cause the problem of shorting the anode and the cathode of the capacitor.
As shown in fig. 1 and 2, 6 and 8, as an embodiment, the electrolytic paper layer body comprises a plurality of layers of stacked electrolytic papers 1, each layer comprises at least one piece of electrolytic paper, and a first sub-electrode foil 2 or a second sub-electrode foil 3 is arranged between two adjacent layers of electrolytic papers 1, so that the first sub-electrode foil 2 or the second sub-electrode foil 3 is clamped between two adjacent layers of electrolytic papers 1, and the first sub-electrode foil 2 and the second sub-electrode foil 3 are prevented from contacting, so that the problem of shorting the anode and the cathode of the capacitor is caused. In the embodiment of the application, each layer may further include a plurality of pieces of electrolytic paper, where the plurality of pieces of electrolytic paper are overlapped and integrally arranged.
Optionally, in fig. 6, a plurality of layers of the first sub-electrode foil 2 and the second sub-electrode foil 3 are additionally provided, and in fig. 6, only an example is shown; in addition, the arrangement positions of the first sub-electrode foil and the second sub-electrode foil in fig. 6 and 8 may be exchanged, and it should be noted that reference numerals 2 and 3 in fig. 6 and 8 represent that the first sub-electrode foil and the second sub-electrode foil are arranged in the corresponding layers formed by the electrolytic paper 1.
Optionally, the electrolytic paper 1 is at least provided in three layers, so that the three layers of electrolytic paper 1 can sandwich at least one first sub-electrode foil 2 and one second sub-electrode foil 3, and of course, the number of electrolytic paper 1 and the number of first sub-electrode foils 2 and second sub-electrode foils 3 in each layer are not particularly limited.
Optionally, the electrolytic paper 1, the first sub-electrode foil 2 and the second sub-electrode foil 3 can be cut into any required shape, so that the special-shaped capacitor can be manufactured according to the requirements and the space of a user, the requirements of the user are met, and the product competitiveness of the capacitor is improved.
As shown in fig. 3, 4 and 9, as another embodiment, the electrolytic paper layer body includes at least one piece of electrolytic paper 1, and the electrolytic paper 1 is continuously folded and arranged to form a plurality of interlayers, so that the at least one piece of electrolytic paper 1 forms a laminated structure, and each interlayer is provided with a first sub-electrode foil 2 or a second sub-electrode foil 3, so that the first sub-electrode foil 2 and the second sub-electrode foil 3 are prevented from contacting, and the problem of shorting the anode and the cathode of the capacitor is caused. In the embodiment of the application, a plurality of pieces of electrolytic paper 1 are stacked together and continuously bent to form a plurality of interlayers.
Alternatively, fig. 9 shows only the position where the first sub-electrode foil 2 is placed during stacking, and in fact the second sub-electrode foil 3 is blocked by the electrolytic paper 1, and the second sub-electrode foil 3 is shown when the positions of the first sub-electrode foil 2 and the second sub-electrode foil 3 are exchanged.
Alternatively, when the electrolytic paper is continuously bent to form a plurality of interlayers, a certain shape treatment can be performed before the electrolytic paper 1 is bent, so that the electrolytic paper 1 and the plurality of first sub-electrode foils 2 and the plurality of second sub-electrode foils 3 can be continuously bent to be cut into any required shape, and the special-shaped capacitor can be manufactured.
As shown in fig. 5 and 7, the solid aluminum capacitor further includes a fixing member 5 as an embodiment, and the fixing member 5 is wound around the outer surface of the capacitor body, thereby fixing the electrode foil layer body and the electrolyte paper layer body.
Alternatively, the fixing member 5 may be a fixing adhesive or a high temperature adhesive tape.
Optionally, the fixing piece 5 can wind and fix the electrode foil layer body and the electrolytic paper layer body in a laminated state, or wind on the outer surface of the electrolytic paper layer body after the electrode foil layer body and the electrolytic paper layer body are wound, so that the solid aluminum capacitor can be made into a sheet structure, adaptability of the solid aluminum capacitor is improved, and different product requirements are met.
Optionally, after the fixing member 5 fixes the capacitor body, a plurality of conductive members 4 representing the positive electrode may be welded on the iron or steel bar, thereby facilitating the subsequent process and mass production of the solid aluminum capacitor.
As shown in fig. 10 to 12, as an embodiment, the solid aluminum capacitor further includes at least one positive electrode lead-out 6 and at least one negative electrode lead-out 6, and the positive electrode lead-out 6 and the negative electrode lead-out 6 are respectively fixedly connected with at least two conductive segments 42 with the same polarity, so that as the positive electrode and the negative electrode of the capacitor, the sealing of the capacitor body with other parts is conveniently realized, and it should be noted that reference numerals 2 and 3 in fig. 11 and 12 represent that the first sub-electrode foil and the second sub-electrode foil are arranged in corresponding layers formed by the electrolytic paper 1.
Alternatively, the positive electrode tab and the conductive segment 42 of the positive electrode may be electrically connected by resistance welding or laser welding to form the positive electrode lead-out 6 of the capacitor, and the negative electrode tab and the conductive segment 42 of the negative electrode may be electrically connected by resistance welding or laser welding to form the negative electrode lead-out 6 of the capacitor.
As one embodiment, the solid aluminum capacitor further comprises a conductive polymer layer, wherein the conductive polymer layer is permeated into the electrolytic paper 1 and covers the outer surface of the multi-layer electrode foil, so that the conductive polymer enters into micropores of an oxide film of the electrode foil, is closely contacted with the oxide film of the electrode foil, and forms a conductive polymer layer with good conductivity, thereby obtaining the capacitor with high frequency, low impedance and good temperature characteristic.
As shown in fig. 12, as an embodiment, the solid aluminum capacitor further includes two insulators 7, the two insulators 7 are provided at both ends of the capacitor body in the stacking direction, and the two insulators 7 are respectively bonded to the fixing member 5 and the electrolytic paper layer. Therefore, the outer surface of the capacitor body is protected and reinforced through the insulating piece 7, and the problems that the solid aluminum capacitor is affected by the outside to bend and damage an oxide film or a conductive polymer layer, so that the leakage current of the product is increased and even fails can be avoided.
Optionally, the insulating member 7 is of a hard structure to ensure structural strength of the insulating member 7.
As shown in fig. 13 and 14, the solid aluminum capacitor further includes a package body provided on the outer surface of the insulator 7, the capacitor body, and a part of the protruding section 41 as one embodiment. The aluminum plastic film and the tab glue are matched to form a packaging body to seal the capacitor body, so that the sealing performance, the moisture resistance, the heat dissipation performance and the like of the capacitor are greatly improved. Meets the requirements of the current part of application scenes on high temperature and high humidity resistance of the capacitor, and meets the market demands.
As an embodiment, the first sub-electrode foil 2 is a positive electrode foil, the positive electrode foil is an aluminum foil, the second sub-electrode foil 3 is a negative electrode foil, and the negative electrode foil is one of an aluminum foil, a carbon foil and a titanium foil, or alternatively; the first sub-electrode foil 2 is a negative electrode foil, the negative electrode foil is one of an aluminum foil, a carbon foil or a titanium foil, the second sub-electrode foil 3 is a positive electrode foil, and the positive electrode foil is an aluminum foil. Therefore, the polarities of the first sub-electrode foil 2 and the second sub-electrode foil 3 can be adjusted according to the requirements of the capacitor, and the adaptability of the capacitor is improved.
As an embodiment, at least two conductive segments 42 having different polarities are provided protruding toward the same direction, or alternatively; the at least two conductive segments 42 with different polarities are arranged in a protruding mode towards different directions, through the arrangement, the protruding direction of the anode lead-out 6 and the cathode lead-out 6 can be adjusted according to the requirement of electric connection of actual products, electric connection with the actual products is facilitated, and therefore adaptability of the capacitor is improved.
Alternatively, if there are two positive electrode lead-out 6 and two negative electrode lead-out 6, they may all protrude in the same direction or may protrude in different directions.
In a second aspect, an embodiment of the present application provides a method for preparing a solid aluminum capacitor provided in the first aspect, including the following steps: s1, arranging a conductive piece on each layer of electrode foil through riveting, so that the conductive piece protrudes out of the electrode foil of the corresponding layer;
s2, arranging electrode foils between two adjacent layers of stacked electrolytic paper, wherein the polarities of the electrode foils of the two adjacent layers are different;
and S3, fixedly connecting the multilayer electrode foil and the electrolytic paper into a whole to obtain the capacitor body.
The electrode foil is arranged between two adjacent layers of laminated electrolytic paper, the polarities of the two adjacent layers of electrode foil are different, namely, the positive electrode and the negative electrode are separated by the electrolytic paper, the positive electrode and the negative electrode are prevented from being led out and shorted, meanwhile, the laminated capacitor can be cut into any required shape, the characteristics of application in a narrower space can be realized, the conductive piece is fixedly arranged on the electrode foil of each layer, the polarity of the conductive piece is the same as that of the corresponding electrode foil, the conductive piece protrudes out of the electrode foil, so that the partial welding of protruding sections of the conductive piece with the same polarity is integrated, the conductive section of the capacitor is used as a conductive electrode of the capacitor, and then the multilayer electrode foil and the electrolytic paper are fixedly connected into a whole through the fixing glue or the high-temperature adhesive tape, so that the solid aluminum capacitor is formed.
Alternatively, the conductive member may be a foil strip or a lead pin, the foil strip or the lead pin is riveted to the cut electrode foil, then the electrode foil and the electrolytic paper are laminated together to form the capacitor body, and finally the capacitor body is fixed by using a fixing adhesive or a high-temperature adhesive tape.
As an embodiment, the electrode foil and the electrolytic paper are cut into any desired shape by means of mechanical cutting, die cutting or laser cutting prior to step S1. For example, the special-shaped capacitor can be manufactured according to the requirement and space of the user, such as ring-shaped, circular and other special-shaped capacitors and the area exceeds 120cm 2 But a high voltage chip type large-sized capacitor having a thin thickness.
As an embodiment, the preparation method further includes step S4: the positive electrode conductive pieces of the solid aluminum capacitor body are fixed on the iron strips or the steel strips through welding, so that subsequent processing and batch production are facilitated.
As an embodiment, the preparation method further includes step S5: immersing a plurality of solid aluminum capacitors welded on iron strips or steel strips into a formation liquid at 30-80 ℃ for 1-100min to form, applying a formation voltage of 0.2-1.2 times of aluminum foil to the formation liquid, and coating the formed solid aluminum capacitors with conductive polymers by an immersion method.
As an embodiment, the preparation method further includes step S6: the positive electrode conductive piece and the negative electrode conductive piece are trimmed to conductive sections with required lengths, and are respectively and firmly connected with the lugs through resistance welding or laser welding so as to serve as positive electrode lead-out and negative electrode lead-out of the solid aluminum capacitor. Therefore, the capacitor can be used as the positive electrode and the negative electrode of the capacitor, and the capacitor body can be conveniently sealed with other parts.
Optionally, after step S6, an insulating member may be disposed at each of two ends of the capacitor body in the stacking direction, so as to provide a hard insulating member on two sides of the capacitor body, and protect the capacitor body.
As shown in fig. 13 and 14, as an embodiment, the preparation method further includes step S7: and matching the aluminum plastic film with the tab glue to form a package body for sealing the capacitor body, thereby preparing a semi-finished product of the capacitor. The sealing mode greatly improves the sealing performance, the moisture resistance, the heat dissipation performance and the like of the capacitor, and the finished product is obtained through subsequent screening procedures such as aging and the like.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (17)

1. A solid aluminum capacitor, comprising: a capacitor body, the capacitor body comprising:
the electrode foil layer body comprises a plurality of layers of electrode foils which are stacked, and the polarities of the two adjacent layers of electrode foils are opposite;
the electrolyte paper layer body is of a laminated structure, and the electrode foil is arranged between two adjacent layers;
the conductive component comprises a plurality of conductive pieces, the plurality of conductive pieces are respectively and correspondingly connected with the plurality of electrode foils, and the conductive pieces are locally protruded from the electrode foils to form protruding sections;
wherein, the protruding section on a plurality of same polarity electrode foils is fixed connection to form two at least different polarity electrically conductive sections.
2. The solid aluminum capacitor of claim 1, wherein the electrode foil comprises a first sub-electrode foil and a second sub-electrode foil, the first sub-electrode foil and the second sub-electrode foil being of opposite polarity.
3. The solid aluminum capacitor of claim 2, wherein the electrolytic paper layer body comprises a plurality of layers of electrolytic paper stacked, each layer comprising at least one of the electrolytic paper, the first sub-electrode foil or the second sub-electrode foil being provided between adjacent two layers.
4. The solid aluminum capacitor of claim 2, wherein the electrolytic paper layer comprises at least one piece of electrolytic paper, the electrolytic paper is continuously folded so that the electrolytic paper forms a laminated structure, and the first sub-electrode foil or the second sub-electrode foil is arranged between two adjacent layers.
5. The solid aluminum capacitor of any of claims 1 to 4, further comprising a fixture wrapped around an outer surface of the capacitor body.
6. The solid aluminum capacitor of any of claims 1 to 4, further comprising at least one positive lead and at least one negative lead, each of the positive and negative leads being fixedly connected to the conductive segments of the same polarity.
7. The solid aluminum capacitor of claim 5, further comprising a conductive polymer layer impregnated into the electrolytic paper and covering the outer surface of the plurality of layers of the electrode foil.
8. The solid aluminum capacitor of claim 7, further comprising two rigid supporting insulators, wherein the two insulators are respectively arranged at two ends of the capacitor body in the stacking direction, and the two insulators are respectively attached to the fixing member and the electrolytic paper layer.
9. The solid aluminum capacitor of claim 8, further comprising an encapsulation provided on the outer surfaces of the insulator, the capacitor body and a portion of the protruding section.
10. The solid aluminum capacitor of any of claims 2 to 4, wherein the first sub-electrode foil is a positive electrode foil, the positive electrode foil is an aluminum foil, the second sub-electrode foil is a negative electrode foil, the negative electrode foil is one of an aluminum foil, a carbon foil, or a titanium foil, or;
the first sub-electrode foil is a negative electrode foil, the negative electrode foil is one of an aluminum foil, a carbon foil or a titanium foil, the second sub-electrode foil is a positive electrode foil, and the positive electrode foil is an aluminum foil.
11. The solid aluminum capacitor of claim 10, wherein the at least two conductive segments having different polarities are disposed to protrude toward the same direction, or;
the at least two conductive segments with different polarities are arranged in a protruding mode towards different directions.
12. A method for manufacturing a solid aluminum capacitor as claimed in any one of claims 1 to 11, comprising the steps of:
s1, arranging a conductive piece on each layer of electrode foil through riveting, so that the conductive piece protrudes out of the electrode foil of the corresponding layer;
s2, arranging electrode foils between two adjacent layers of stacked electrolytic paper, wherein the polarities of the electrode foils of the two adjacent layers are different;
and S3, fixedly connecting the multilayer electrode foil and the electrolytic paper into a whole to obtain the capacitor body.
13. The method of claim 12, wherein the electrode foil and the electrolytic paper are cut into any desired shape by mechanical cutting, die cutting or laser cutting prior to step S1.
14. The method of manufacturing according to claim 12, further comprising step S4: and the positive electrode conducting pieces of the solid aluminum capacitor body are all fixed on an iron bar or a steel bar through welding.
15. The method of preparation according to claim 14, further comprising step S5: the solid aluminum capacitor fixed on the iron or steel bar is formed and impregnated with the conductive high polymer.
16. The method of manufacturing according to claim 15, further comprising step S6: the positive electrode conductive piece and the negative electrode conductive piece are trimmed to conductive sections with required lengths, and are respectively and firmly connected with the lugs through resistance welding or laser welding so as to serve as positive electrode lead-out and negative electrode lead-out of the solid aluminum capacitor.
17. The method of manufacturing according to claim 16, further comprising step S7: and the aluminum plastic film is matched with the tab glue to form the sealed capacitor body of the packaging body.
CN202311196460.1A 2023-09-15 2023-09-15 Solid aluminum capacitor and preparation method thereof Pending CN117438218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311196460.1A CN117438218A (en) 2023-09-15 2023-09-15 Solid aluminum capacitor and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311196460.1A CN117438218A (en) 2023-09-15 2023-09-15 Solid aluminum capacitor and preparation method thereof

Publications (1)

Publication Number Publication Date
CN117438218A true CN117438218A (en) 2024-01-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311196460.1A Pending CN117438218A (en) 2023-09-15 2023-09-15 Solid aluminum capacitor and preparation method thereof

Country Status (1)

Country Link
CN (1) CN117438218A (en)

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