CN114724857A - Aluminum electrolytic capacitor based on sintered aluminum foil and preparation method thereof - Google Patents
Aluminum electrolytic capacitor based on sintered aluminum foil and preparation method thereof Download PDFInfo
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- CN114724857A CN114724857A CN202210299046.2A CN202210299046A CN114724857A CN 114724857 A CN114724857 A CN 114724857A CN 202210299046 A CN202210299046 A CN 202210299046A CN 114724857 A CN114724857 A CN 114724857A
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- 239000011888 foil Substances 0.000 title claims abstract description 162
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 80
- 239000003990 capacitor Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims description 6
- 238000004804 winding Methods 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 13
- 239000003792 electrolyte Substances 0.000 claims abstract description 12
- 238000005470 impregnation Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 9
- 229910000861 Mg alloy Inorganic materials 0.000 description 5
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical group [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/052—Sintered electrodes
- H01G9/0525—Powder therefor
-
- 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
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
An aluminum electrolytic capacitor based on a sintered aluminum foil comprises a core bag and a shell, wherein the core bag is hermetically arranged in the shell; the core bag comprises anode foil, electrolytic paper and cathode foil, wherein the electrolytic paper is arranged between the anode foil and the cathode foil; the core bag contains electrolyte, the anode foil is a sintered aluminum foil, and the sintered aluminum foil comprises a substrate and aluminum powder or aluminum alloy powder sintered on the substrate. In the invention, the winding radius of the core package at the initial winding stage is increased through the arrangement of the winding drum, so that the sintered aluminum foil is ensured not to generate cracks during winding so as to generate leakage current; meanwhile, the oxide film on the sintered aluminum foil in the present invention can be made thicker than that of the conventional etched foil to increase the withstand voltage.
Description
Technical Field
The invention relates to an aluminum electrolytic capacitor, in particular to an aluminum electrolytic capacitor based on a sintered aluminum foil and a preparation method thereof.
Background
The thickness of the oxide film on the surface of the anode foil of the medium-high voltage aluminum electrolytic capacitor is relatively thick, so that the grooves formed on the surface of the anode foil by traditional etching cannot be too fine, otherwise the grooves are filled by the oxide film generated in the subsequent formation process, and the capacitance of the common medium-high voltage aluminum electrolytic capacitor is not high.
To solve this problem, Toyo aluminum Co., Ltd, Japan, discloses a sintered aluminum foil, as in patent No. 2008801287834, an electrolytic material for aluminum electrolytic capacitors and a method for producing the electrode material; the anode foil disclosed in this patent is sintered on a base using aluminum powder or aluminum alloy powder, thereby increasing the surface area of the anode foil, and since the aluminum powder or aluminum alloy powder is sintered on the base, the oxide film formed on the aluminum powder or aluminum alloy powder has little influence on the porosity, thereby increasing the capacitance of the capacitor.
The anode foil disclosed by toyoyo aluminum co.ltd. of japan is formed by sintering aluminum powder or aluminum alloy powder on a substrate, and this makes the anode foil weak against bending, and when the core pack is wound, cracks are likely to occur due to a small winding radius, particularly on the anode foil with one inner layer of the core pack. Therefore, the sintered aluminum foil is generally used in the laminated capacitor; however, the manufacturing difficulty and cost of the laminated capacitor are higher than those of the traditional aluminum electrolytic capacitor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an aluminum electrolytic capacitor capable of increasing capacitance and based on sintered aluminum foil and a preparation method thereof
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the aluminum electrolytic capacitor based on the sintered aluminum foil comprises a core bag and a shell, wherein the core bag is hermetically arranged in the shell; the core package comprises an anode foil, an electrolytic paper and a cathode foil, wherein the electrolytic paper is arranged between the anode foil and the cathode foil; the core bag contains electrolyte, the anode foil is a sintered aluminum foil, and the sintered aluminum foil comprises a substrate and aluminum powder or aluminum alloy powder sintered on the substrate.
In the above aluminum electrolytic capacitor based on sintered aluminum foil, preferably, the core package is formed by winding an anode foil, electrolytic paper and a cathode foil; the core bag is characterized in that an insulating winding drum is arranged in the center of the core bag, and the anode foil, the electrolytic paper and the cathode foil are wound on the winding drum.
In the above aluminum electrolytic capacitor based on sintered aluminum foil, preferably, at least one layer of electrolytic paper is wound on the winding drum.
Preferably, the anode foil and the cathode foil are respectively provided with an anode foil guiding strip and a cathode foil guiding strip, and the anode foil guiding strip and the cathode foil guiding strip are respectively and electrically connected to the anode pin and the cathode pin.
In the aluminum electrolytic capacitor based on the sintered aluminum foil, preferably, the electrolytic paper extends out of the upper end of the core pack by 0.5-2 mm.
A method for preparing an aluminum electrolytic capacitor based on a sintered aluminum foil comprises the following steps,
1) sleeving a winding cylinder on a winding needle of a coil nailing machine and fixing;
2) winding the anode foil, the electrolytic paper and the cathode foil on a winding drum to form a core package, wherein the electrolytic paper at the upper end and/or the lower end of the core package extends out 0.5-2 mm; the anode foil is a sintered aluminum foil which comprises a substrate and aluminum powder or aluminum alloy powder sintered on the substrate;
3) the core bag is impregnated with electrolyte;
4) electrically connecting the anode foil guide strip and the cathode foil guide strip on the anode foil and the cathode foil to the anode pin and the cathode pin respectively;
5) hermetically arranging the core package of the step 4) in the shell.
In the above method for manufacturing an aluminum electrolytic capacitor based on a sintered aluminum foil, preferably, in step 2), before winding the anode foil and the cathode foil, the electrolytic paper is wound on the winding drum so that the core package forms a paper inner core with a diameter of 1-3 mm.
In the above method for manufacturing an aluminum electrolytic capacitor based on a sintered aluminum foil, the impregnation electrolyte in step 3) may be preferably heated impregnation, vacuum impregnation or pressurized impregnation.
In the invention, the size of the cavity on the sintered aluminum foil can be adjusted to a certain extent by adjusting the particle sizes of the aluminum powder and the aluminum alloy powder, and the size of the cavity on the sintered aluminum foil is generally larger than that of the groove on the traditional etched foil, so that the oxide film on the sintered aluminum foil can be thicker than that of the traditional etched foil, thereby increasing the pressure resistance value.
Compared with the prior art, the invention has the advantages that: according to the invention, the winding radius of the core package in the initial winding stage is increased through the arrangement of the winding drum, so that the sintered aluminum foil is ensured not to generate cracks during winding so as to generate leakage current.
Drawings
Fig. 1 is a schematic view showing a structure in which a core pack is unfolded in example 1.
Description of the figures
1. A winding drum; 2. An anode foil; 3. electrolyzing paper; 4. a cathode foil; 5. an anode foil guide strip; 6. and a cathode foil guide strip.
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 based on sintered aluminum foil, the diameter of the capacitor shell is 42mm (phi 42), and the rated voltage is 315V; the core bag is sealed in the shell through the cover plate, and the diameter of the core bag is about 41 mm. The core package comprises an anode foil 2, electrolytic paper 3 and a cathode foil 4, wherein the electrolytic paper 3 is arranged between the anode foil 2 and the cathode foil 4; the core bag contains electrolyte, the anode foil 2 is a sintered aluminum foil, the sintered aluminum foil comprises a substrate and aluminum alloy powder sintered on the substrate, the aluminum alloy powder is aluminum-magnesium alloy powder, the weight of aluminum accounts for 80-90% of the total weight, and the weight of magnesium accounts for 10-20% of the total weight. In this embodiment, after the al-mg alloy powder is sintered on the substrate, the porosity of the entire sintered aluminum foil is about 35%.
In the present embodiment, as shown in fig. 1, the core pack is formed by winding an anode foil 2, an electrolytic paper 3 and a cathode foil 4; the core package is characterized in that an insulating winding drum 1 is arranged in the center of the core package, an anode foil 2, an electrolytic paper 3 and a cathode foil 4 are wound on the winding drum 1, and the diameter of the winding drum 1 is about 5.5 mm. A layer of electrolytic paper 3 is wound on the winding drum 1, and the layer of electrolytic paper 3 is wound on the winding drum 1 firstly to prevent the anode foil 2 or the cathode foil 4 from being directly wound on the winding drum 1, so that the influence of the winding drum 1 on the anode foil 2 or the cathode foil 4, particularly the influence on the anode foil 2 is avoided. The material of the winding drum 1 is the same as or close to that of the electrolytic paper 3, and the winding surface of the winding drum 1 is preferably relatively soft; the winding drum 1 must be insulated because the capacitor is at a high voltage ratio in practical use to prevent the anode foil 2 from being electrically connected to the housing through the winding drum 1.
In this embodiment, as shown in fig. 1, an anode foil strip 5 and a cathode foil strip 6 are respectively disposed on the anode foil 2 and the cathode foil 4, and the anode foil strip 5 and the cathode foil strip 6 are respectively riveted on the anode pin and the cathode pin of the cover plate. The electrolytic paper 3 extends out of the upper end of the core bag by 0.5-2mm, so that a safe distance is reserved between the anode foil strip 5 on the anode foil 2 and the cathode foil 4 of the core bag, and the safe distance is generated by the electrolytic paper 3 extending out of the core bag by 0.5-2 mm; similarly, there is a safety distance between the cathode foil 4 and the anode foil 2 of the core package.
The aluminum electrolytic capacitor of the embodiment is a medium-high voltage aluminum electrolytic capacitor, and the rated voltage of the aluminum electrolytic capacitor is 315V; in the embodiment, the anode foil 2 is made of sintered aluminum foil, so that the anode foil 2 does not need to be etched to increase the surface area; since the aluminum magnesium alloy powder sintered on the anode foil 2 of the present embodiment has a strong void structure, its surface area itself is large. In this embodiment, it is needless to say that the anode foil 2 may be etched, but the acid used for etching affects the aluminum magnesium alloy powder sintered on the base, and the bonding strength between the aluminum magnesium alloy powders is reduced.
The embodiment also provides a preparation method of the aluminum electrolytic capacitor based on the sintered aluminum foil, which comprises the following steps,
1) sleeving the winding drum 1 on a winding needle of a coil nailing machine and fixing;
2) winding the anode foil 2, the electrolytic paper 3 and the cathode foil 4 on the winding drum 1 to form a core package, wherein the electrolytic paper 3 at the upper end of the core package extends out by 0.5-2 mm; the anode foil 2 is a sintered aluminum foil, and the sintered aluminum foil comprises a substrate and aluminum powder or aluminum alloy powder sintered on the substrate. The electrolytic paper is wound on the winding drum 1 before the anode foil 2 and the cathode foil 4 are wound, so that the core package produces a paper core of about 2mm diameter. In this example, the paper core consists of electrolytic paper.
3) The core bag is impregnated with electrolyte; vacuum impregnation is adopted when the electrolyte is impregnated; since the anode foil 2 is a sintered aluminum foil containing relatively many voids, a large amount of electrolyte can be impregnated therein, and the core pack can be relatively easily impregnated with the electrolyte having a high viscosity.
4) Respectively and electrically connecting an anode foil guide strip 5 and a cathode foil guide strip 6 on the anode foil 2 and the cathode foil 4 to an anode pin and a cathode pin of the cover plate;
5) and (3) sealing the core package obtained in the step 4) in the shell through the cover plate.
In this embodiment, some capacity is lost due to the existence of the winding drum 1, and the anode foil 2 wound by the core package with the same diameter is less, but since the anode foil 2 in this embodiment is made of the sintered aluminum foil, the surface area of the anode foil 2 can be greatly increased due to the strong void structure of the sintered aluminum foil, the capacitor of the capacitor can be greatly increased, and the capacitance of the medium-high voltage capacitor is obviously improved.
Comparative example 1
In comparative example 1, a conventional etched anode foil 2 was used, the winding bobbin 1 was not provided inside the core pack, and the anode foil 2, the electrolytic paper 3, and the cathode foil 4 were directly wound, and the diameter of the core pack was also about 41 mm. The other parts of comparative example 1 were the same as example 1.
20 products of example 1 and comparative example 1 were selected and tested for capacitance and voltage endurance, respectively, and the average results were as follows:
| serial number | Average capacitance (. mu.F) | Average withstand voltage value (V) |
| Example 1 | 47.3 | 368.2 |
| Comparative example 1 | 43.8 | 329.6 |
As can be seen from the above table, the average capacitance of example 1 is not increased much than that of comparative example 1 because the winding drum 1 of example 1 occupies a certain amount of space so that the length of the anode foil 2 is not greater than that of the anode foil 2 of comparative example 1; however, the withstand voltage value in example 1 is significantly improved over that in comparative example 1, because the oxide film on the surface of anode foil 2 cannot be thickened too much when the formation is performed in comparative example 1, and the grooves on anode foil 2 are clogged with an excessive amount of oxide film.
Claims (8)
1. An aluminum electrolytic capacitor based on sintered aluminum foil comprises a core bag and a shell, wherein the core bag is hermetically arranged in the shell; the core package comprises an anode foil, an electrolytic paper and a cathode foil, wherein the electrolytic paper is arranged between the anode foil and the cathode foil; the method is characterized in that: the core bag contains electrolyte, the anode foil is a sintered aluminum foil, and the sintered aluminum foil comprises a substrate and aluminum powder or aluminum alloy powder sintered on the substrate.
2. The aluminum electrolytic capacitor based on sintered aluminum foil as recited in claim 1, wherein: the core package is formed by winding anode foil, electrolytic paper and cathode foil; the core bag is characterized in that an insulating winding drum is arranged in the center of the core bag, and the anode foil, the electrolytic paper and the cathode foil are wound on the winding drum.
3. The aluminum electrolytic capacitor based on sintered aluminum foil as recited in claim 2, wherein: at least one layer of electrolytic paper is wound on the winding drum.
4. The aluminum electrolytic capacitor based on sintered aluminum foil as recited in claim 1, wherein: and the anode foil and the cathode foil are respectively provided with an anode foil guiding strip and a cathode foil guiding strip which are respectively and electrically connected to the anode pin and the cathode pin.
5. The aluminum electrolytic capacitor based on sintered aluminum foil as recited in claim 1, wherein: the electrolytic paper extends out of the upper end of the core bag by 0.5-2 mm.
6. A preparation method of an aluminum electrolytic capacitor based on a sintered aluminum foil is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
1) sleeving a winding cylinder on a winding needle of a coil nailing machine and fixing;
2) winding the anode foil, the electrolytic paper and the cathode foil on a winding drum to form a core package, wherein the electrolytic paper at the upper end and/or the lower end of the core package extends out 0.5-2 mm; the anode foil is a sintered aluminum foil which comprises a substrate and aluminum powder or aluminum alloy powder sintered on the substrate;
3) the core bag is impregnated with electrolyte;
4) electrically connecting the anode foil strip and the cathode foil strip on the anode foil and the cathode foil to the anode terminal and the cathode terminal respectively;
5) hermetically arranging the core package of the step 4) in the shell.
7. The method for manufacturing an aluminum electrolytic capacitor based on a sintered aluminum foil as recited in claim 6, wherein: in the step 2), before winding the anode foil and the cathode foil, the electrolytic paper is wound on a winding drum so that the core package generates a paper inner core with the diameter of 1-3 mm.
8. The method for manufacturing an aluminum electrolytic capacitor based on a sintered aluminum foil as recited in claim 6, wherein: the impregnation electrolyte in the step 3) can adopt heating impregnation, vacuum impregnation or pressure impregnation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210299046.2A CN114724857A (en) | 2022-03-25 | 2022-03-25 | Aluminum electrolytic capacitor based on sintered aluminum foil and preparation method thereof |
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| CN202210299046.2A CN114724857A (en) | 2022-03-25 | 2022-03-25 | Aluminum electrolytic capacitor based on sintered aluminum foil and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI857660B (en) | 2022-07-29 | 2024-10-01 | 大陸商湖南艾華集團股份有限公司 | Capacitor core, aluminum electrolytic capacitor and packaging method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110610809A (en) * | 2019-08-26 | 2019-12-24 | 湖南艾华集团股份有限公司 | High-voltage laminated aluminum electrolytic capacitor and preparation method thereof |
| CN111033657A (en) * | 2017-10-10 | 2020-04-17 | 东洋铝株式会社 | Electrode material for aluminum electrolytic capacitor and method for producing same |
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2022
- 2022-03-25 CN CN202210299046.2A patent/CN114724857A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111033657A (en) * | 2017-10-10 | 2020-04-17 | 东洋铝株式会社 | Electrode material for aluminum electrolytic capacitor and method for producing same |
| CN110610809A (en) * | 2019-08-26 | 2019-12-24 | 湖南艾华集团股份有限公司 | High-voltage laminated aluminum electrolytic capacitor and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI857660B (en) | 2022-07-29 | 2024-10-01 | 大陸商湖南艾華集團股份有限公司 | Capacitor core, aluminum electrolytic capacitor and packaging method thereof |
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