CN110828179A - Aluminum electrolytic capacitor with strong ripple current resistance and preparation method thereof - Google Patents
Aluminum electrolytic capacitor with strong ripple current resistance and preparation method thereof Download PDFInfo
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- CN110828179A CN110828179A CN201911052064.5A CN201911052064A CN110828179A CN 110828179 A CN110828179 A CN 110828179A CN 201911052064 A CN201911052064 A CN 201911052064A CN 110828179 A CN110828179 A CN 110828179A
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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
- H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
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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
- H01G9/004—Details
- H01G9/008—Terminals
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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
- H01G9/004—Details
- H01G9/14—Structural combinations or circuits for modifying, or compensating for, electric characteristics of electrolytic capacitors
Abstract
The utility model provides an aluminium electrolytic capacitor that resistant ripple current ability is strong, including shell and core package, the core package is sealed in the shell, the core package is by the anode foil, electrolytic paper and negative pole foil are convoluteed or are folded and form, anode foil and the last positive pole of riveting respectively of negative pole foil lead foil strip and negative pole foil lead foil strip, the aluminium system thin slice has been pasted with the combined position of negative pole foil strip, the aluminium system thin slice is pasted on negative pole foil and negative pole foil strip, the aluminium system thin slice includes aluminium foil base body and sintering aluminium lamination, the sintering aluminium lamination by aluminium powder or the sintering aluminium alloy powder sintering is sintered on the aluminium foil base body of the one side that aluminium system thin slice and negative pole foil hug. The capacitor disclosed by the invention has the advantages of less internal short circuit and strong ripple current resistance.
Description
Technical Field
The invention relates to an aluminum electrolytic capacitor, in particular to an aluminum electrolytic capacitor with strong ripple current resistance and a preparation method thereof.
Background
At present, in a traditional capacitor production process, an anode foil, electrolytic paper and a cathode foil are directly wound into a core package, an anode foil guide strip and a cathode foil guide strip are directly riveted on the anode foil and the cathode foil, and a plurality of anode guide pins and cathode guide pins are also provided, burrs at the joint parts of the anode foil guide strip and the cathode foil guide strip and the anode foil and the cathode foil are directly contacted with the electrolytic paper, and the burrs can pierce the electrolytic paper or the burrs generate point discharge under an electric field to cause short circuit breakdown of the capacitor.
In order to solve the above problems, patent No. 200410023289.5, a patent of an aluminum electrolytic capacitor and a method for manufacturing the same, in which the tongue portions of the cathode lead and the anode lead are covered with aluminum thin sheets, solves the short circuit caused by the penetration of the anode lead or the cathode lead through the electrolytic paper well. However, the electrical connection points between the aluminum sheet and the anode foil or the cathode foil are not so many, so that the ripple current resistance of the capacitor is not greatly improved, and the ripple current resistance of the capacitor cannot meet the requirement in some occasions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an aluminum electrolytic capacitor with strong ripple current resistance and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the utility model provides an aluminium electrolytic capacitor that resistant ripple current ability is strong, includes shell and core package, the core package is sealed in the shell, the core package is formed by anode foil, electrolytic paper and negative pole foil winding or folding, it leads foil strip and negative pole to have the positive pole to lead foil strip and negative pole on anode foil and the negative pole foil to rivet respectively, the aluminium system thin slice is pasted with the combination position of negative pole foil to the negative pole lead foil strip, the aluminium system thin slice is pasted on negative pole foil and negative pole lead foil strip, the aluminium system thin slice includes aluminium foil base body and sintering aluminium lamination, the sintering has the sintering aluminium lamination by aluminium powder or aluminium alloy powder sintering on the aluminium foil base body of the one side that aluminium system thin slice and negative pole foil are hugged.
Preferably, in the aluminum electrolytic capacitor with high ripple current resistance, the porosity of the sintered aluminum layer is between 10% and 50%, and the sintered aluminum layer on the aluminum sheet is embedded in the cathode foil and the cathode foil-guiding strip so that the aluminum sheet is in close contact with the cathode foil and the cathode foil-guiding strip.
Preferably, in the aluminum electrolytic capacitor with high ripple current resistance, the aluminum sheet is press-riveted or pricked-riveted on the cathode foil, and the aluminum sheet covers a joint portion of the cathode foil strip and the cathode foil.
Above-mentioned aluminum electrolytic capacitor that resistant ripple current ability is strong, preferred, the aluminium system thin slice has also been pasted to the binding position of positive pole foil strip and positive pole paper tinsel, the aluminium system thin slice is pasted on positive pole paper tinsel and positive pole foil strip, the aluminium system thin slice includes aluminium foil base body and sintering aluminium layer, the one side that aluminium system thin slice and positive pole paper tinsel are hugged closely is sintered and is had the sintering aluminium layer by aluminium powder or aluminium alloy powder sintering.
Preferably, in the aluminum electrolytic capacitor with high ripple current resistance, the sintered aluminum layer of the aluminum sheet on the anode foil guide strip is embedded into the anode foil and the anode foil guide strip so that the aluminum sheet is in close contact with the anode foil and the anode foil guide strip.
Preferably, in the aluminum electrolytic capacitor with high ripple current resistance, the aluminum sheet is press-riveted or pricked-riveted on the anode foil, and the aluminum sheet covers a joint of the anode foil strip and the anode foil.
Preferably, the anode foil guide strip and the cathode foil guide strip are replaced by an anode guide pin and a cathode guide pin.
A preparation method of an aluminum electrolytic capacitor with strong ripple current resistance capability comprises the following steps:
1) respectively riveting an anode foil guide strip and a cathode foil guide strip on the anode foil and the cathode foil;
2) pressing or riveting an aluminum sheet on the cathode foil strip, wherein the aluminum sheet covers the combination position of the anode foil strip and the cathode foil; one surface of the aluminum sheet, which is tightly attached to the cathode foil, is sintered with a sintered aluminum layer sintered by aluminum powder or aluminum alloy powder; the preparation method of the aluminum sheet comprises the following steps:
①, preparing slurry, namely uniformly mixing aluminum powder or aluminum alloy powder and a binder, wherein the binder is dispersed in a solvent;
② forming a film formed of the slurry produced in step 1) on an aluminum foil substrate;
③ sintering the ② aluminum foil substrate at 600-660 deg.C;
④ cutting the aluminum foil substrate sintered in step ③ into aluminum sheets with a predetermined size;
3) the anode foil, electrolytic paper and cathode foil are wound or folded into a core package.
Compared with the prior art, the invention has the advantages that: in the invention, the aluminum sheet is covered on the anode foil guide strip and the cathode foil guide strip, so that burrs at the joint parts of the anode foil guide strip and the cathode foil guide strip and the anode foil and the cathode foil are prevented from directly contacting the electrolytic paper, and the short circuit breakdown of the capacitor caused by the point discharge of the burrs penetrating the electrolytic paper and the burrs under an electric field is solved. Meanwhile, due to the effect of the aluminum thin sheet, the two surfaces of the anode foil guiding strip and the cathode foil guiding strip can conduct electricity with the anode foil and the cathode foil, so that the ripple current resistance of the capacitor is enhanced. Due to the arrangement of the sintered aluminum layer on the aluminum sheet, after the aluminum sheet is press-riveted or pricked and riveted on the cathode foil or the anode foil, the sintered aluminum layer can be embedded into the cathode foil or the anode foil, so that the aluminum sheet and the cathode foil or the anode foil are connected more tightly, conductive channels between the anode foil guide strip and the cathode foil guide strip and between the anode foil and the cathode foil are further expanded, the contact resistance is reduced, heat generation is reduced, the heat dissipation of the capacitor can meet general requirements, and the temperature rise speed is reduced; thereby improving the ripple current resistance of the capacitor. Meanwhile, the sintered aluminum layer on the aluminum sheet increases the heat dissipation area, so that the aluminum sheet has better heat dissipation performance; the ripple current resistance of the capacitor is further enhanced.
Drawings
Fig. 1 is a schematic view of the structure of the cathode foil to which the aluminum foil is press-riveted in example 1.
Fig. 2 is a schematic sectional structure view of fig. 1.
Description of the figures
1. A cathode foil; 2. a cathode foil guide strip; 3. an aluminum foil; 4. a thin aluminum substrate; 5. and sintering the aluminum layer.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example 1
An aluminum electrolytic capacitor with strong ripple current resistance comprises a shell and a core package, wherein the core package is sealed in the shell through a rubber plug, the core package is formed by winding an anode foil, electrolytic paper and a cathode foil 1, an anode foil guide strip and a cathode foil guide strip 2 are respectively riveted on the anode foil and the cathode foil 1, an aluminum sheet 3 is pasted at the combination position of the cathode foil guide strip 2 and the cathode foil 1, the aluminum sheet 3 is pasted on the cathode foil 1 and the cathode foil guide strip 2, the aluminum sheet 3 comprises an aluminum foil base body 4 and a sintered aluminum layer 5, the sintered aluminum layer 5 sintered by aluminum powder or aluminum alloy powder is sintered on the aluminum foil base body 4 on one side, close to the cathode foil 1, of the aluminum sheet 3, the doped elements of the aluminum alloy powder comprise one or more of silicon, iron, copper, manganese, magnesium, zinc, nickel and the like, and the content of each element is preferably not more than 100ppm by weight. In this embodiment, the particle size of the aluminum powder or aluminum alloy powder is 10 to 500. mu.m, preferably 50 to 100. mu.m.
The porosity of the sintered aluminum layer 5 is between 10% and 50%, the sintered aluminum layer 5 on the aluminum sheet 3 is embedded into the cathode foil 1 and the cathode foil guide strip 2, so that the aluminum sheet 3 is tightly contacted with the cathode foil 1 and the cathode foil guide strip 2, a conductive channel between the cathode foil guide strip 2 and the cathode foil 1 is increased, the contact resistance is reduced, heat generation is reduced, the heat dissipation of the capacitor can meet general requirements, and the temperature rising speed is reduced; thereby improving the ripple current resistance of the capacitor. Meanwhile, the sintered aluminum layer on the aluminum sheet increases the heat dissipation area, so that the aluminum sheet has better heat dissipation performance, and the ripple current resistance of the capacitor is further improved. Aluminum sheet 3 is riveted on cathode foil 1, and aluminum sheet 3 covers the joint of cathode foil strip 2 and cathode foil 1, so that burrs at the joint of cathode foil strip 2 and cathode foil 1 can be covered, and the problem of short circuit breakdown of capacitor caused by the fact that burrs at the joint pierce electrolytic paper and the burrs tip discharge under an electric field is solved.
In this embodiment, after covering aluminium system thin slice 3 on negative pole foil strip 2, not only can play the problem of solving the electrolytic paper and being impaled by the burr, the two sides of negative pole foil strip 2 all can switch on with negative pole foil 1 electrical property, has increased the electrical connection passageway between negative pole foil strip 2 and the negative pole foil 1 like this, can strengthen the resistant ripple current's of condenser ability. The surface that aluminium system thin slice 3 and negative pole foil strip 2 and negative pole foil 1 contact is formed with sintered aluminium layer 5, when aluminium system thin slice 3 riveting on negative pole foil 1, because aluminium system thin slice 3 can receive riveted pressure, the sintered aluminium can be embedded into in negative pole foil 1 and the negative pole foil strip 2 under the effect of riveting pressure like this, the electric connection between aluminium system thin slice 3 and negative pole foil strip 1 and the negative pole foil strip 2 is better than the electric connection of patent 200410023289.5, the ripple current resistance ability of condenser is also stronger. Since the sintered aluminum layer 5 is hard and brittle, it can be embedded in the relatively soft cathode foil 1 and anode foil after being subjected to pressure at the time of caulking, and the cathode foil 1 and anode foil are relatively soft because they need to be wound.
In this embodiment, aluminium system thin slice 3 has also been pasted to the binding position of positive pole foil strip and positive pole paper tinsel, aluminium system thin slice 3 pastes on positive pole paper tinsel and positive pole foil strip, aluminium system thin slice 3 includes aluminium foil base 4 and sintering aluminium lamination 5, the one side sintering that aluminium system thin slice 3 and positive pole paper tinsel are hugged closely has the sintering aluminium lamination 5 by aluminium powder or the sintering of aluminium alloy powder. The sintered aluminum layer 5 of the aluminum sheet 3 on the anode foil strip is embedded in the anode foil and the anode foil strip so that the aluminum sheet 3 is in close contact with the anode foil and the anode foil strip. The aluminum sheet 3 is press-riveted or pierce-riveted to the anode foil, and the aluminum sheet 3 covers the joint portion of the anode foil strip and the anode foil. As can be seen from the above, the structure of aluminum sheet 3 on anode foil strip is the same as that of aluminum sheet 3 on cathode foil strip 2.
In other embodiments, the effect of replacing the anode foil guiding strip and the cathode foil guiding strip 2 with the anode guiding pin and the cathode guiding pin is the same.
The invention also provides a preparation method of the aluminum electrolytic capacitor with strong ripple current resistance, which comprises the following steps:
1) respectively riveting an anode foil guide strip and a cathode foil guide strip 2 on the anode foil and the cathode foil 1;
2) pressing or riveting an aluminum sheet 3 on the cathode foil guide strip 2, wherein the aluminum sheet 3 covers the combination position of the anode foil guide strip and the cathode foil 1; a sintered aluminum layer 5 sintered by aluminum powder or aluminum alloy powder is sintered on one surface of the aluminum sheet 3, which is tightly attached to the cathode foil 1; the preparation method of the aluminum sheet 3 comprises the following steps:
①, preparing slurry, namely uniformly mixing aluminum powder or aluminum alloy powder and a binder, wherein the binder is dispersed in a solvent;
② forming a film formed of the slurry produced in step 1) on the aluminum foil base 4;
③ sintering the aluminum foil substrate 4 in step ② at the temperature of 600-660 ℃ for 5-10 hours;
④ cutting the aluminum foil substrate 4 sintered in step ③ into aluminum sheets 3 of a predetermined size;
3) the anode foil, electrolytic paper and cathode foil 1 are wound or folded into a core package. Other manufacturing processes of the capacitor in this embodiment are the same as those of the conventional manufacturing process.
In this embodiment, the binder may be a resin binder, and the binder is dispersed in a solvent to reduce the viscosity at the slurry preparation stage. Sintering aids, surface active agents and the like can also be added into the slurry. The agent may be any commercially available agent, and in this embodiment, the resin binder is preferably one or more of polyvinyl alcohol resin, polyester resin, epoxy resin, and phenol resin. The solvent of the binder can be ethanol, acetone, or lipid organic solvent. A surfactant comprising one or more of polypropylene, polyethylene glycol and ethylene-acrylic acid copolymer.
In this embodiment, in order to prevent the slurry from collapsing during sintering, the step of removing the resin is performed first, and the step of removing the photoresist may be performed by raising the temperature to 400 ℃. sup.300-.
The capacitor of this embodiment can withstand ripple current by a factor of more than 35% compared to a capacitor in which the aluminum sheet 3 is not sintered with sintered aluminum, i.e., the capacitor of patent 200410023289.5.
Claims (8)
1. An aluminum electrolytic capacitor with strong ripple current resistance capability is characterized in that: including shell and core package, the core package is sealed in the shell, the core package is formed by anode foil, electrolytic paper and negative pole foil winding or folding, the riveting has positive pole to lead foil strip and negative pole to lead the foil strip on anode foil and the negative pole foil respectively, the aluminium system thin slice is pasted with the binding position of negative pole foil to the negative pole foil strip, the aluminium system thin slice is pasted on negative pole foil and negative pole foil strip, the aluminium system thin slice includes aluminium foil base body and sintering aluminium lamination, the sintering has the sintering aluminium lamination by aluminium powder or aluminium alloy powder sintering on the aluminium foil base body of the one side that aluminium system thin slice and negative pole foil hug closely.
2. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, wherein: the porosity of the sintered aluminum layer is between 10% and 50%, and the sintered aluminum layer on the aluminum sheet is embedded into the cathode foil and the cathode foil-guiding strip so that the aluminum sheet is in close contact with the cathode foil and the cathode foil-guiding strip.
3. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, wherein: the aluminum sheet is pressed or pricked on the cathode foil, and the aluminum sheet covers the joint of the cathode foil guiding strip and the cathode foil.
4. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, wherein: the aluminum foil is characterized in that an aluminum sheet is also pasted at the joint position of the anode foil guiding strip and the anode foil, the aluminum sheet is pasted on the anode foil and the anode foil guiding strip and comprises an aluminum foil base body and a sintered aluminum layer, and the sintered aluminum layer sintered by aluminum powder or aluminum alloy powder is sintered on the surface of the aluminum sheet, which is tightly attached to the anode foil.
5. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 4, wherein: and the sintered aluminum layer of the aluminum sheet on the anode foil guide strip is embedded into the anode foil and the anode foil guide strip so that the aluminum sheet is in close contact with the anode foil and the anode foil guide strip.
6. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 4, wherein: the aluminum sheet is pressed or pricked on the anode foil, and the aluminum sheet covers the joint of the anode foil guiding strip and the anode foil.
7. The aluminum electrolytic capacitor with strong ripple current resistance according to any one of claims 1 to 6, wherein: and replacing the anode foil guide strip and the cathode foil guide strip with an anode guide pin and a cathode guide pin.
8. A method for manufacturing an aluminum electrolytic capacitor with strong ripple current resistance according to any one of claims 1 to 7, wherein: the method comprises the following steps:
1) respectively riveting an anode foil guide strip and a cathode foil guide strip on the anode foil and the cathode foil;
2) pressing or riveting an aluminum sheet on the cathode foil strip, wherein the aluminum sheet covers the combination position of the anode foil strip and the cathode foil; one surface of the aluminum sheet, which is tightly attached to the cathode foil, is sintered with a sintered aluminum layer sintered by aluminum powder or aluminum alloy powder; the preparation method of the aluminum sheet comprises the following steps:
①, preparing slurry, namely uniformly mixing aluminum powder or aluminum alloy powder and a binder, wherein the binder is dispersed in a solvent;
② forming a film formed of the slurry produced in step 1) on an aluminum foil substrate;
③ sintering the ② aluminum foil substrate at 600-660 deg.C;
④ cutting the aluminum foil substrate sintered in step ③ into aluminum sheets with a predetermined size;
3) the anode foil, electrolytic paper and cathode foil are wound or folded into a core package.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911052064.5A CN110828179B (en) | 2019-10-31 | 2019-10-31 | Aluminum electrolytic capacitor with strong ripple current resistance and preparation method thereof |
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| CN110828179B CN110828179B (en) | 2021-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024021210A1 (en) * | 2022-07-29 | 2024-02-01 | 湖南艾华集团股份有限公司 | Jelly roll, and aluminum electrolytic capacitor and packaging method therefor |
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| CN110828179B (en) | 2021-07-16 |
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