CN114093675A - Electrolyte for 600V ultrahigh voltage aluminum electrolytic capacitor, preparation method thereof and application of electrolyte in aluminum electrolytic capacitor - Google Patents
Electrolyte for 600V ultrahigh voltage aluminum electrolytic capacitor, preparation method thereof and application of electrolyte in aluminum electrolytic capacitor Download PDFInfo
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- CN114093675A CN114093675A CN202111289195.2A CN202111289195A CN114093675A CN 114093675 A CN114093675 A CN 114093675A CN 202111289195 A CN202111289195 A CN 202111289195A CN 114093675 A CN114093675 A CN 114093675A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 132
- 239000003990 capacitor Substances 0.000 title claims abstract description 130
- 239000003792 electrolyte Substances 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000002904 solvent Substances 0.000 claims abstract description 48
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 45
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 45
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 20
- RSKXGCFFFZIWNC-UHFFFAOYSA-N 4,5,6,7-tetraphenyl-2-benzofuran-1,3-dione Chemical compound O=C1OC(=O)C(C(=C(C=2C=CC=CC=2)C=2C=3C=CC=CC=3)C=3C=CC=CC=3)=C1C=2C1=CC=CC=C1 RSKXGCFFFZIWNC-UHFFFAOYSA-N 0.000 claims abstract description 13
- LXOFYPKXCSULTL-UHFFFAOYSA-N 2,4,7,9-tetramethyldec-5-yne-4,7-diol Chemical group CC(C)CC(C)(O)C#CC(C)(O)CC(C)C LXOFYPKXCSULTL-UHFFFAOYSA-N 0.000 claims abstract description 12
- -1 tetrabutylammonium tetrafluoroborate Chemical compound 0.000 claims abstract description 11
- FJJTTZOOICZCMI-UHFFFAOYSA-N 2,7-dibutyloctanedioic acid Chemical compound CCCCC(C(O)=O)CCCCC(C(O)=O)CCCC FJJTTZOOICZCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 239000003112 inhibitor Substances 0.000 claims abstract description 5
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 claims abstract description 4
- 239000011888 foil Substances 0.000 claims description 47
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 22
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 12
- 238000005470 impregnation Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 10
- 235000010855 food raising agent Nutrition 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- WTPAXIMTWYTETA-UHFFFAOYSA-N (3-nitrobenzoyl) 3-nitrobenzoate Chemical compound [O-][N+](=O)C1=CC=CC(C(=O)OC(=O)C=2C=C(C=CC=2)[N+]([O-])=O)=C1 WTPAXIMTWYTETA-UHFFFAOYSA-N 0.000 claims description 7
- 229930188620 butyrolactone Natural products 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 239000004254 Ammonium phosphate Substances 0.000 claims description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 3
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 3
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 3
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 3
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 3
- 235000015424 sodium Nutrition 0.000 claims description 2
- 238000004078 waterproofing Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000000010 aprotic solvent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
-
- 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
-
- 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
-
- 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
- H01G9/145—Liquid electrolytic capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The application discloses electrolyte for a 600V ultrahigh voltage aluminum electrolytic capacitor, a preparation method thereof and application of the electrolyte in the aluminum electrolytic capacitor. The electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor is prepared from the following raw materials in parts by weight: 40-55 parts of a main solvent, 5-15 parts of an auxiliary solvent, 10-20 parts of a solute, 8-12 parts of a flash voltage improver, 4-7 parts of a waterproof agent and 0.5-2 parts of a corrosion inhibitor, wherein the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol, the solute is one or more of tetrabutylammonium tetrafluoroborate, ammonium borate and 2, 7-dibutyl suberic acid, and the flash voltage improver is one or more of polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride. The aluminum electrolytic capacitor has the advantages of good thermal stability and long service life.
Description
Technical Field
The invention relates to the technical field of aluminum electrolytic capacitors, in particular to electrolyte for a 600V ultrahigh voltage aluminum electrolytic capacitor, a preparation method thereof and application thereof in the aluminum electrolytic capacitor.
Background
At present, the aluminum electrolytic capacitor is widely applied to the aspects of filtering, bypassing, coupling, resonance, phase shifting, energy storage and the like. The positive electrode and the negative electrode of the aluminum electrolytic capacitor are both aluminum foils, electrolytic paper is arranged between the positive electrode and the negative electrode, and the electrolytic paper is soaked with liquid electrolyte. The aluminum electrolytic capacitor has large capacity and positive and negative polarities, and the negative electrode of the aluminum electrolytic capacitor is electrolyte in the true sense. The surface of the positive aluminum foil is uneven after being corroded, and the surface of the positive aluminum foil is covered with a layer of aluminum oxide film, wherein the aluminum oxide film is a medium of the aluminum electrolytic capacitor.
With the development of science and technology, the aluminum electrolytic capacitor has higher requirements at present, and the voltage resistance, the thermal stability and the service life of the aluminum electrolytic capacitor need to be improved.
Disclosure of Invention
In order to improve the pressure resistance and the thermal stability of the aluminum electrolytic capacitor and prolong the service life of the aluminum electrolytic capacitor, the application provides the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor, the preparation method of the electrolyte, the aluminum electrolytic capacitor prepared from the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor and the processing technology of the aluminum electrolytic capacitor.
In a first aspect, the application provides an electrolyte for a 600V ultrahigh voltage aluminum electrolytic capacitor, which adopts the following technical scheme: the electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor is prepared from the following raw materials in parts by weight: 40-55 parts of a main solvent, 5-15 parts of an auxiliary solvent, 10-20 parts of a solute, 8-12 parts of a flash voltage improver, 4-7 parts of a waterproof agent and 0.5-2 parts of a corrosion inhibitor, wherein the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol, the solute is one or more of tetrabutylammonium tetrafluoroborate, ammonium borate and 2, 7-dibutyl suberic acid, and the flash voltage improver is one or more of polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride.
By adopting the technical scheme, the aluminum electrolytic capacitor prepared by the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor has the advantages of high voltage resistance, high temperature resistance and long service life, under the conditions of 600V and 110 ℃, after 2000h of use, the appearance of the aluminum electrolytic capacitor is kept normal, the capacitance reduction rate is 0.81-1.72%, the dielectric loss factor improvement rate is 7.69-14.47%, and the leakage current range is 2-2.5mA after 2000h, which indicates that in the aluminum electrolytic capacitor, the thermal stability of the aluminum electrolytic capacitor is improved through the synergistic effect of the raw materials in the electrolyte, the service life of the aluminum electrolytic capacitor is prolonged, and the aluminum electrolytic capacitor meets the market demand.
In the application, 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol is adopted as an auxiliary solvent which is polyhydric alcohol, the defect of low conductivity caused by a conventional aprotic solvent can be overcome, the auxiliary solvent can be dissolved with ethylene glycol which is a main solvent in a similar way, methyl and tert-butyl in an organic matter can shield hydroxyl, the auxiliary solvent is not easy to react with solute to generate water due to the steric hindrance of the methyl and the tert-butyl, the service life of the aluminum electrolytic capacitor is prolonged, the flash voltage of the aluminum electrolytic capacitor is increased by taking polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride as flash voltage increasing agents, the polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride are easy to be adsorbed by a aluminum oxide film, therefore, an adsorption layer is formed on the surface of the anode, the edge effect is eliminated, the sparking voltage of the aluminum electrolytic capacitor can be obviously improved due to the oxidizing capability of the sparking voltage improver, and the polyethylene glycol (400) -3-nitrobenzoate is prepared in a catalyst-free and molten state, so that impurities are not easily introduced into the electrolyte, and the influence of the impurities on the service life of the aluminum electrolytic capacitor is reduced.
Moreover, the applicant also finds that the service life of the aluminum electrolytic capacitor can reach more than 2000h without adding a hydrogen eliminating agent, and the existence of the nitro group and the aryl group in the sparking voltage improver can reduce the gas released in the electrolyte and prolong the service life of the aluminum electrolytic capacitor.
Optionally, the solute is tetrabutylammonium tetrafluoroborate and 2, 7-dibutylsuberic acid with a mass ratio of 2: 3.
By adopting the technical scheme, the solute raw material is easy to obtain, and the conductivity of the electrolyte can be improved.
Optionally, the sparking voltage raising agent is polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride in a mass ratio of 2: 1.
By adopting the technical scheme, the sparking voltage of the electrolyte can be further improved, and the rated voltage of the aluminum electrolytic capacitor is improved.
Optionally, the polyethylene glycol (400) -3-nitrobenzoate is prepared from the following raw materials in parts by weight: 7-10 parts of polyethylene glycol (400), 10-15 parts of 3-nitrobenzoic anhydride and 3-5 parts of toluene.
By adopting the technical scheme, the raw material of the polyethylene glycol (400) -3-nitrobenzoate is simple and easy to obtain.
Alternatively, polyethylene glycol (400) -3-nitrobenzoate is prepared by:
step S1: mixing polyethylene glycol (400) and 3-nitrobenzoic anhydride, heating to 150 ℃ and 170 ℃ under the stirring condition, and vacuumizing to 10-15 kPa to obtain a mixture;
step S2: adding toluene into the mixture, refluxing, reacting for 5-7h, cooling to room temperature, separating liquid, removing water, and distilling to remove toluene to obtain polyethylene glycol (400) -3-nitrobenzoate.
By adopting the technical scheme, the preparation of the polyethylene glycol (400) -3-nitrobenzoate is simple, stable and easy to operate.
Optionally, the main solvent is a mixture of 1: (3-4) a mixture of ethylene glycol and butyrolactone.
By adopting the technical scheme, the main solvent raw material is simple and easy to obtain, and the working temperature range of the aluminum electrolytic capacitor can be improved.
Optionally, the waterproof mixture is one or more of ammonium phosphate, ammonium dihydrogen phosphate and sodium metaaluminate; the anticorrosive agent is one of phosphotungstic acid and EDTA.
By adopting the technical scheme, the raw materials of the waterproof agent and the anticorrosive agent are simple and easy to obtain, the waterproof agent can effectively reduce the occurrence of hydration in the electrolyte, and the anticorrosive agent can reduce the corrosion of impurity ions to the aluminum electrolytic capacitor, so that the service life of the aluminum electrolytic capacitor is prolonged.
In a second aspect, the application provides a preparation method of an electrolyte for a 600V ultrahigh voltage aluminum electrolytic capacitor, which adopts the following technical scheme:
a preparation method of electrolyte for 600V ultrahigh voltage aluminum electrolytic capacitor comprises the following steps:
step Sa: uniformly mixing the main solvent and the auxiliary solvent, heating to 110-130 ℃, and adding the sparking voltage improver under the stirring condition;
and Sb: heating to 150 ℃ and 160 ℃, adding the solute, and stirring until all the substances are fully dissolved and uniformly mixed;
step Sc: cooling to 100-105 ℃, adding the waterproof agent and the anticorrosive agent, stirring until all the substances are fully dissolved, and cooling to room temperature to prepare the electrolyte.
By adopting the technical scheme, the electrolyte is simple and stable to prepare.
In a third aspect, the present application provides an aluminum electrolytic capacitor, which adopts the following technical scheme:
the utility model provides an aluminum electrolytic capacitor, includes top open-ended casing, sets up the core package in the casing, the core package includes positive pole paper tinsel, negative pole paper tinsel, sets up in the electrolytic paper of positive pole paper tinsel and negative pole paper tinsel homonymy, it has electrolyte to soak on the electrolytic paper, the casing top is provided with the sealing member, be provided with anodal lead wire, the negative pole lead wire that runs through the sealing member in the casing, anodal lead wire in the casing with positive pole paper tinsel fixed connection, the negative pole lead wire in the casing with negative pole paper tinsel fixed connection, electrolyte is foretell 600V electrolyte for the superhigh pressure aluminum electrolytic capacitor.
By adopting the technical scheme, the prepared aluminum electrolytic capacitor has the advantages of high pressure resistance, excellent heat-resistant stability and long service life.
In a fourth aspect, the present application provides a method for manufacturing an aluminum electrolytic capacitor, which adopts the following technical scheme:
a preparation method of an aluminum electrolytic capacitor comprises the following steps:
(1) winding: respectively putting the cathode foil and the anode foil on the same side into electrolytic paper, and winding into a core package;
(2) dipping: immersing the core bag into electrolyte for impregnation treatment, wherein the electrolyte is the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor;
(3) assembling: filling the core package subjected to impregnation treatment into a shell, fixedly connecting an anode lead in the shell with an anode foil, fixedly connecting a cathode lead in the shell with a cathode foil, sealing an opening of the shell by using a sealing member, and penetrating the anode lead and the cathode lead through the sealing member and extending out of the shell;
(4) aging: the pressure is increased to 600-700V in a segmented manner under the normal temperature condition, then the pressure is thermally charged and stabilized for 3-5 h under the conditions of 600V and 80-100 ℃, and then the pressure is increased to 600-700V from 0V at one time and is stabilized for 2-3h, so that the 600V ultrahigh-voltage aluminum electrolytic capacitor is obtained.
By adopting the technical scheme, the aluminum electrolytic capacitor is simple to prepare and easy to operate.
In summary, the present application has at least the following beneficial effects:
1. the application discloses 600V superhigh pressure is electrolyte for aluminum electrolytic capacitor, through adding auxiliary solvent to electrolyte: 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol, has promoted the electric conductivity of electrolyte, and has promoted the impregnation rate of electrolyte, and its unique structure simultaneously for the hydroxyl in this organic matter is difficult for reacting with the solute and produces water, thereby has promoted aluminum electrolytic capacitor's life, through using polyethylene glycol (400) -3-nitrobenzoate, tetraphenylphthalic anhydride as the voltage of sparking lifting agent, has improved aluminum electrolytic capacitor's voltage of sparking, makes aluminum electrolytic capacitor in this application have high pressure resistant, thermal stability is good, long service life's advantage.
2. The conductive capacity of the electrolyte is enhanced by taking tetrabutylammonium tetrafluoroborate and 2, 7-dibutylsuberic acid in a mass ratio of 2:3 as solutes, so that the rated voltage of the aluminum electrolytic capacitor is improved, the solutes have weak reactivity with a main solvent and an auxiliary solvent, and the generation of water in the electrolyte is reduced, so that the service life of the aluminum electrolytic capacitor is further prolonged.
Detailed Description
Raw materials
The polyethylene glycol (400) is 25322-68-3 and is selected from Shandong Xin chemostat, Inc.
The present invention will be described in further detail with reference to examples.
Preparation example
TABLE 1 raw material content of polyethylene glycol (400) -3-nitrobenzoate in preparation examples 1-3 (kg)
| Raw materials | Preparation example 1 | Preparation example 2 | Preparation example 3 |
| Polyethylene glycol (400) | 7 | 10 | 8 |
| 3-Nitrobenzoic anhydride | 10 | 15 | 13 |
| Toluene | 4 | 3 | 5 |
Preparation example 1
Polyethylene glycol (400) -3-nitrobenzoate, the raw material content of which is shown in table 1.
Polyethylene glycol (400) -3-nitrobenzoate prepared by the following method:
step S1: adding polyethylene glycol (400) and 3-nitrobenzoic anhydride into a reaction kettle, connecting the reaction kettle with an oil-water separator, heating to 150 ℃ under the condition of stirring, and vacuumizing to 15kPa to obtain a mixture;
step S2: and adding toluene into the mixture, refluxing, reacting for 7h, cooling to room temperature, separating liquid, removing water, and distilling to remove toluene to obtain the polyethylene glycol (400) -3-nitrobenzoate.
Preparation examples 2 to 3
Polyethylene glycol (400) -3-nitrobenzoate which differs from preparation 1 in the content of the starting materials, as shown in Table 1.
Preparation example 4
Polyethylene glycol (400) -3-nitrobenzoate which differs from preparation example 1 in the preparation conditions.
Polyethylene glycol (400) -3-nitrobenzoate prepared by the following method:
step S1: adding polyethylene glycol (400) and 3-nitrobenzoic anhydride into a reaction kettle, connecting the reaction kettle with an oil-water separator, heating to 170 ℃ under the condition of stirring, and vacuumizing to 10kPa to obtain a mixture;
step S2: and adding toluene into the mixture, refluxing, reacting for 5h, cooling to room temperature, separating liquid, removing water, and distilling to remove toluene to obtain the polyethylene glycol (400) -3-nitrobenzoate.
Examples
TABLE 2 raw material content of electrolyte in examples 1 to 4 (kg)
| Raw materials | Example 1 | Example 2 | Example 3 | Example 4 |
| Principal solvent | 45 | 55 | 40 | 50 |
| Auxiliary solvent | 10 | 5 | 15 | 12 |
| Solute | 18 | 10 | 12 | 20 |
| Sparking voltage booster | 12 | 10 | 8 | 11 |
| Waterproof mixture | 6 | 5 | 7 | 7 |
| Corrosion inhibitor | 1 | 0.5 | 2 | 1.5 |
Example 1
The raw material contents of the electrolyte for 600V ultra-high voltage aluminum electrolytic capacitor are shown in table 2.
Wherein the mass ratio of the main solvent is 1: 3 mixtures of ethylene glycol, butyrolactone;
the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol;
the solute is tetrabutylammonium tetrafluoroborate;
the flash voltage booster is polyethylene glycol (400) -3-nitrobenzoate, and the polyethylene glycol (400) -3-nitrobenzoate is prepared by preparation example 1;
the waterproof mixture is ammonium phosphate;
the anticorrosive agent is phosphotungstic acid.
An electrolyte prepared by the method comprising:
step Sa: uniformly mixing the main solvent and the auxiliary solvent, heating to 110 ℃, and adding the sparking voltage improver under the stirring condition;
and Sb: heating to 160 ℃, adding a solute, stirring until all the substances are fully dissolved and uniformly mixed;
step Sc: cooling to 100 ℃, adding the waterproof agent and the anticorrosive agent, stirring until all the substances are fully dissolved, and cooling to room temperature to prepare the electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor.
Example 2
The raw material contents of the electrolyte for 600V ultra-high voltage aluminum electrolytic capacitor are shown in table 2.
Wherein the mass ratio of the main solvent is 1: 4 mixtures of ethylene glycol, butyrolactone;
the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol;
the solute is tetrabutylammonium tetrafluoroborate;
the flash voltage booster is polyethylene glycol (400) -3-nitrobenzoate, and the polyethylene glycol (400) -3-nitrobenzoate is prepared by preparation example 2;
the waterproof mixture is ammonium dihydrogen phosphate;
the anticorrosive agent is phosphotungstic acid.
An electrolyte prepared by the method comprising:
step Sa: uniformly mixing the main solvent and the auxiliary solvent, heating to 110 ℃, and adding the sparking voltage improver under the stirring condition;
and Sb: heating to 160 ℃, adding a solute, stirring until all the substances are fully dissolved and uniformly mixed;
step Sc: cooling to 100 ℃, adding the waterproof agent and the anticorrosive agent, stirring until all the substances are fully dissolved, and cooling to room temperature to prepare the electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor.
Example 3
The raw material contents of the electrolyte for 600V ultra-high voltage aluminum electrolytic capacitor are shown in table 2.
Wherein the mass ratio of the main solvent is 1: 4 mixtures of ethylene glycol, butyrolactone;
the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol;
the solute is tetrabutylammonium tetrafluoroborate;
the flash voltage booster is polyethylene glycol (400) -3-nitrobenzoate, and the polyethylene glycol (400) -3-nitrobenzoate is prepared by preparation example 3;
the waterproof agent is sodium metaaluminate;
the corrosion inhibitor is EDTA.
An electrolyte prepared by the method comprising:
step Sa: uniformly mixing the main solvent and the auxiliary solvent, heating to 120 ℃, and adding the sparking voltage improver under the stirring condition;
and Sb: heating to 155 ℃, adding a solute, stirring until all the substances are fully dissolved and uniformly mixed;
step Sc: cooling to 102 ℃, adding the waterproof agent and the anticorrosive agent, stirring until all the substances are fully dissolved, and cooling to room temperature to prepare the electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor.
Example 4
The raw material contents of the electrolyte for 600V ultra-high voltage aluminum electrolytic capacitor are shown in table 2.
Wherein the mass ratio of the main solvent is 1: 4 mixtures of ethylene glycol, butyrolactone;
the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol;
the solute is tetrabutylammonium tetrafluoroborate;
the flash voltage booster is polyethylene glycol (400) -3-nitrobenzoate, and the polyethylene glycol (400) -3-nitrobenzoate is prepared by preparation example 4;
the waterproof agent is sodium metaaluminate;
the anticorrosive agent is phosphotungstic acid.
An electrolyte prepared by the method comprising:
step Sa: uniformly mixing the main solvent and the auxiliary solvent, heating to 130 ℃, and adding the sparking voltage improver under the stirring condition;
and Sb: heating to 150 ℃, adding a solute, stirring until all the substances are fully dissolved and uniformly mixed;
step Sc: cooling to 105 ℃, adding the waterproof agent and the anticorrosive agent, stirring until all the substances are fully dissolved, and cooling to room temperature to prepare the electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor.
Example 5
An electrolyte for a 600V ultrahigh-voltage aluminum electrolytic capacitor is different from the electrolyte in example 1 in that the solute is equal ammonium borate.
Example 6
An electrolyte for a 600V ultrahigh-voltage aluminum electrolytic capacitor, which is different from the electrolyte in example 1 in that the solute is 2, 7-dibutyl suberic acid in the same amount.
Example 7
An electrolyte for a 600V ultrahigh-voltage aluminum electrolytic capacitor is different from the electrolyte in example 1 in that solutes comprise tetrabutylammonium tetrafluoroborate and 2, 7-dibutylsuberic acid in an equivalent mass ratio of 2: 3.
Example 8
An electrolyte for a 600V ultrahigh voltage aluminum electrolytic capacitor, which is different from example 7 in that the sparking voltage raising agent is tetraphenylphthalic anhydride of the same amount.
Example 9
An electrolyte for a 600V ultrahigh-voltage aluminum electrolytic capacitor is different from the electrolyte in example 7 in that a flash voltage raising agent is polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride with the same mass ratio of 2: 1.
Application example
Application example 1
An aluminum electrolytic capacitor comprises a shell with an opening at the top end and a core package arranged in the shell, wherein the core package comprises an anode foil, a cathode foil and electrolytic paper arranged at the same side of the anode foil and the cathode foil, electrolyte is soaked on the electrolytic paper, a sealing element is arranged at the top end of the shell, a positive lead and a negative lead penetrating through the sealing element are arranged in the shell, the positive lead is fixedly connected with the anode foil in the shell, the negative lead is fixedly connected with the cathode foil in the shell, and the electrolyte is the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor provided by any one of embodiments 1-9.
A preparation method of an aluminum electrolytic capacitor comprises the following steps:
a preparation method of an aluminum electrolytic capacitor comprises the following steps:
(1) winding: respectively putting the cathode foil and the anode foil on the same side into electrolytic paper, and winding into a core package;
(2) dipping: immersing the core bag into electrolyte for impregnation treatment;
(3) assembling: filling the core package subjected to impregnation treatment into a shell, fixedly connecting an anode lead in the shell with an anode foil, fixedly connecting a cathode lead in the shell with a cathode foil, sealing an opening of the shell by using a sealing member, and penetrating the anode lead and the cathode lead through the sealing member and extending out of the shell;
(4) aging: the voltage is increased to 650V in sections under the condition of normal temperature, then the voltage is stabilized for 5h under the conditions of 650V and 90 ℃, and then the voltage is increased to 650V from 0V at one time and stabilized for 2.5h, and the aluminum electrolytic capacitor is obtained.
Application example 2
An aluminum electrolytic capacitor comprises a shell with an opening at the top end and a core package arranged in the shell, wherein the core package comprises an anode foil, a cathode foil and electrolytic paper arranged at the same side of the anode foil and the cathode foil, electrolyte is soaked on the electrolytic paper, a sealing element is arranged at the top end of the shell, a positive lead and a negative lead penetrating through the sealing element are arranged in the shell, the positive lead is fixedly connected with the anode foil in the shell, the negative lead is fixedly connected with the cathode foil in the shell, and the electrolyte is the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor provided by the embodiments 1-9.
A preparation method of an aluminum electrolytic capacitor comprises the following steps:
a preparation method of an aluminum electrolytic capacitor comprises the following steps:
(1) winding: respectively putting the cathode foil and the anode foil on the same side into electrolytic paper, and winding into a core package;
(2) dipping: immersing the core bag into electrolyte for impregnation treatment;
(3) assembling: filling the core package subjected to impregnation treatment into a shell, fixedly connecting an anode lead in the shell with an anode foil, fixedly connecting a cathode lead in the shell with a cathode foil, sealing an opening of the shell by using a sealing member, and penetrating the anode lead and the cathode lead through the sealing member and extending out of the shell;
(4) aging: the voltage is increased to 700V in sections under the condition of normal temperature, then the voltage is stabilized for 4h under the conditions of 700V and 100 ℃, and then the voltage is increased to 700V from 0V at one time and stabilized for 3h, thus obtaining the aluminum electrolytic capacitor.
Application example 3
An aluminum electrolytic capacitor comprises a shell with an opening at the top end and a core package arranged in the shell, wherein the core package comprises an anode foil, a cathode foil and electrolytic paper arranged at the same side of the anode foil and the cathode foil, electrolyte is soaked on the electrolytic paper, a sealing element is arranged at the top end of the shell, a positive lead and a negative lead penetrating through the sealing element are arranged in the shell, the positive lead is fixedly connected with the anode foil in the shell, the negative lead is fixedly connected with the cathode foil in the shell, and the electrolyte is the electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor provided by the embodiments 1-9.
A preparation method of an aluminum electrolytic capacitor comprises the following steps:
a preparation method of an aluminum electrolytic capacitor comprises the following steps:
(1) winding: respectively putting the cathode foil and the anode foil on the same side into electrolytic paper, and winding into a core package;
(2) dipping: immersing the core bag into electrolyte for impregnation treatment;
(3) assembling: filling the core package subjected to impregnation treatment into a shell, fixedly connecting an anode lead in the shell with an anode foil, fixedly connecting a cathode lead in the shell with a cathode foil, sealing an opening of the shell by using a sealing member, and penetrating the anode lead and the cathode lead through the sealing member and extending out of the shell;
(4) aging: the voltage is increased to 600V in sections under the condition of normal temperature, then the voltage is stabilized for 3h under the conditions of 600V and 80 ℃, and then the voltage is increased to 600V from 0V at one time and stabilized for 2h, so that the aluminum electrolytic capacitor is obtained.
Comparative example
Comparative example 1
An electrolyte for a 600V ultra-high voltage aluminum electrolytic capacitor, which is different from example 9 in that a sparking voltage raising agent is not added.
Comparative example 2
An electrolyte for a 600V ultra-high voltage aluminum electrolytic capacitor, which is different from example 9 in that an auxiliary solvent is not added.
Performance test
The electrolytic solutions of examples 1 to 9 and comparative examples 1 to 2 were used to prepare aluminum electrolytic capacitors by the method of application example 1, and the 11 types of aluminum electrolytic capacitors were tested as follows.
The 600V ultrahigh voltage electrolytic capacitors of examples 1 to 9 and comparative examples 1 to 2 in the present application and the aluminum electrolytic capacitor of the comparative example were applied with 600V DC voltage at 110 ℃ for 2000 hours, and the experimental results are shown in Table 3. Wherein the control group is commercially available 3300μF. 600V aluminum electrolytic capacitor.
Meanwhile, a conventional commercially available aluminum electrolytic capacitor was used as a comparative example.
TABLE 3 test results
As can be seen from Table 3, the aluminum electrolytic capacitor of the present application has excellent performance, 600V DC voltage is applied to the aluminum electrolytic capacitor, the appearance can still be kept normal after 2000h under the condition of 110 ℃, the C (capacitance) reduction rate of the aluminum electrolytic capacitor after 2000h is 0.81-1.72%, the DF (dielectric loss factor) improvement rate is 7.69-14.47%, the range of IL (leakage current) in the initial state is 1.8-2.3mA, and the range of IL (leakage current) after 2000h is 2-2.5mA, which shows that the aluminum electrolytic capacitor of the present application has excellent performance, is suitable for 600V high-voltage condition, is suitable for 110 ℃ high-temperature condition, has long service life, and can still keep excellent performance after 2000h, and the application range of the aluminum electrolytic capacitor of the present application is improved, and meets the market demand.
As can be seen from comparative example 1 and example 9 in Table 3, when the sparking voltage raising agent was not added, the initial state capacity of the aluminum electrolytic capacitor was 5189 μ F and the dielectric loss factor was 0.171, but under the conditions of 600V DC at 110 ℃ the phenomena of seal swelling and electrolyte ejection occurred, and it was difficult to maintain the normal continuous operation of the aluminum electrolytic capacitor. The sparking voltage raising agent can raise the sparking voltage of the aluminum electrolytic capacitor, so that the rated working voltage of the aluminum electrolytic capacitor can reach 600V. Combining example 7 and example 8, it can be seen that when the flash voltage raising agent is polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride in a mass ratio of 2:1, the performance of the aluminum electrolytic capacitor is better than that of the aluminum electrolytic capacitor which uses polyethylene glycol (400) -3-nitrobenzoate or tetraphenylphthalic anhydride alone as the flash voltage raising agent. The synergistic effect exists between the tetraphenylphthalic anhydride and the polyethylene glycol (400) -3-nitrobenzoate, so that the sparking voltage of the aluminum electrolytic capacitor is further improved, the capacitance reduction rate of the aluminum electrolytic capacitor is 0.81%, the dielectric loss factor improvement rate is 7.69%, and the aluminum electrolytic capacitor can still keep excellent performance under the condition and meet the market demand.
As can be seen from comparative example 2 and example 9 in table 3, the aluminum electrolytic capacitor had a capacity decreasing rate of 4.84%, a dielectric loss factor increasing rate of 26.78%, and IL of 6.3mA after 2000h when no auxiliary solvent was added, while it had a capacity decreasing rate of 0.81%, a dielectric loss factor increasing rate of 7.69%, and IL of 2mA after 2000h when an auxiliary solvent was added. The addition of the auxiliary solvent leads the performance of the aluminum electrolytic capacitor to be more excellent. Auxiliary solvent: the 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol is a polyol, can be similarly compatible with a main solvent, and can improve the conductivity of the solvent. The alkyl at the alpha position of the hydroxyl in the 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol has a protective effect on the hydroxyl, and reduces water generated by the reaction of the hydroxyl and a solute, thereby prolonging the service life of the aluminum electrolytic capacitor. In addition, the 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol is a surfactant and can reduce the surface tension of the electrolyte, so that the impregnation rate of the electrolyte is improved.
As can be seen from the comparative example and example 9 in Table 3, the commercial aluminum electrolytic capacitor with 3300 μ F and 600V specifications has a capacitance reduction rate of 5.8%, a dielectric loss factor improvement rate of 28.57%, and an IL of 9.3mA after 2000h at 110 ℃ and 2000h, and shows a seal swell phenomenon, which indicates a shorter life and a lower heat resistance stability than the aluminum electrolytic capacitor of the present application. The performance of the aluminum electrolytic capacitor is superior to that of the commonly sold 600V aluminum electrolytic capacitor, the aluminum electrolytic capacitor has higher heat resistance stability and longer service life, and the market demand is met.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor is characterized by being prepared from the following raw materials in parts by weight: 40-55 parts of a main solvent, 5-15 parts of an auxiliary solvent, 10-20 parts of a solute, 8-12 parts of a flash voltage improver, 4-7 parts of a waterproof agent and 0.5-2 parts of a corrosion inhibitor, wherein the auxiliary solvent is 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol, the solute is one or more of tetrabutylammonium tetrafluoroborate, ammonium borate and 2, 7-dibutyl suberic acid, and the flash voltage improver is one or more of polyethylene glycol (400) -3-nitrobenzoate and tetraphenylphthalic anhydride.
2. The electrolyte for a 600V ultra-high voltage aluminum electrolytic capacitor according to claim 1, wherein the solutes are tetrabutylammonium tetrafluoroborate and 2, 7-dibutylsuberic acid at a mass ratio of 2: 3.
3. The electrolyte for 600V ultrahigh-voltage aluminum electrolytic capacitors as claimed in claim 1, wherein the sparking voltage raising agent is polyethylene glycol (400) -3-nitrobenzoate, tetraphenylphthalic anhydride in a mass ratio of 2: 1.
4. The electrolyte for the 600V ultra-high voltage aluminum electrolytic capacitor according to claim 3, wherein the polyethylene glycol (400) -3-nitrobenzoate is prepared from the following raw materials in parts by weight: 7-10 parts of polyethylene glycol (400), 10-15 parts of 3-nitrobenzoic anhydride and 3-5 parts of toluene.
5. The electrolyte for 600V ultra-high voltage aluminum electrolytic capacitor according to claim 4, wherein the polyethylene glycol (400) -3-nitrobenzoate is prepared by:
step S1: mixing polyethylene glycol (400) and 3-nitrobenzoic anhydride, heating to 150 ℃ and 170 ℃ under the stirring condition, and vacuumizing to 10-15 kPa to obtain a mixture;
step S2: adding toluene into the mixture, refluxing, reacting for 5-7h, cooling to room temperature, separating liquid, removing water, and distilling to remove toluene to obtain polyethylene glycol (400) -3-nitrobenzoate.
6. The electrolyte for a 600V ultra-high voltage aluminum electrolytic capacitor according to claim 1, wherein the main solvent is a mixture of, by mass, 1: (3-4) a mixture of ethylene glycol and butyrolactone.
7. The electrolyte for the 600V ultrahigh-voltage aluminum electrolytic capacitor as set forth in claim 1, wherein the water-proofing agent is one or more of ammonium phosphate, ammonium dihydrogen phosphate and sodium metaaluminate;
the anticorrosive agent is one of phosphotungstic acid and EDTA.
8. A method for preparing the electrolyte for 600V ultra high voltage aluminum electrolytic capacitor according to any one of claims 1 to 7, comprising the steps of:
step Sa: uniformly mixing the main solvent and the auxiliary solvent, heating to 110-130 ℃, and adding the sparking voltage improver under the stirring condition;
and Sb: heating to 150 ℃ and 160 ℃, adding the solute, and stirring until all the substances are fully dissolved and uniformly mixed;
step Sc: cooling to 100-105 ℃, adding the waterproof agent and the anticorrosive agent, stirring until all the substances are fully dissolved, and cooling to room temperature to prepare the electrolyte.
9. An aluminum electrolytic capacitor comprises a shell with an opening at the top end and a core package arranged in the shell, wherein the core package comprises anode foil, cathode foil and electrolytic paper arranged at the same side of the anode foil and the cathode foil, the electrolytic paper is soaked with electrolyte, a sealing element is arranged at the top end of the shell, a positive lead and a negative lead penetrating through the sealing element are arranged in the shell, the positive lead is fixedly connected with the anode foil in the shell, and the negative lead is fixedly connected with the cathode foil in the shell.
10. A preparation method of an aluminum electrolytic capacitor is characterized by comprising the following steps:
(1) winding: respectively putting the cathode foil and the anode foil on the same side into electrolytic paper, and winding into a core package;
(2) dipping: immersing the core bag into an electrolyte for the 600V ultrahigh voltage aluminum electrolytic capacitor according to any one of claims 1 to 7, and carrying out impregnation treatment;
(3) assembling: filling the core package subjected to impregnation treatment into a shell, fixedly connecting an anode lead in the shell with an anode foil, fixedly connecting a cathode lead in the shell with a cathode foil, sealing an opening of the shell by using a sealing member, and penetrating the anode lead and the cathode lead through the sealing member and extending out of the shell;
(4) aging: the pressure is increased to 600-700V in sections under the normal temperature condition, then the pressure is thermally stabilized for 3-5 h under the conditions of 600V and 80-100 ℃, and then the pressure is increased to 600-700V from 0V at one time and is stabilized for 2-3h, thus obtaining the aluminum electrolytic capacitor.
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