CN114068184A - Aluminum electrolytic capacitor and preparation method thereof - Google Patents
Aluminum electrolytic capacitor and preparation method thereof Download PDFInfo
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- CN114068184A CN114068184A CN202111567069.9A CN202111567069A CN114068184A CN 114068184 A CN114068184 A CN 114068184A CN 202111567069 A CN202111567069 A CN 202111567069A CN 114068184 A CN114068184 A CN 114068184A
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- electrolytic capacitor
- aluminum electrolytic
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- 239000003990 capacitor Substances 0.000 title claims abstract description 79
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 41
- -1 hexanediol ammonium Chemical compound 0.000 claims abstract description 41
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims abstract description 34
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims abstract description 30
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 27
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 19
- 239000001257 hydrogen Substances 0.000 claims abstract description 19
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 17
- 230000000996 additive effect Effects 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 17
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 11
- ARKIFHPFTHVKDT-UHFFFAOYSA-N 1-(3-nitrophenyl)ethanone Chemical compound CC(=O)C1=CC=CC([N+]([O-])=O)=C1 ARKIFHPFTHVKDT-UHFFFAOYSA-N 0.000 claims abstract description 10
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004254 Ammonium phosphate Substances 0.000 claims abstract description 10
- OTRAYOBSWCVTIN-UHFFFAOYSA-N OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N Chemical compound OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N OTRAYOBSWCVTIN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 10
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims abstract description 10
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims abstract description 10
- 235000019289 ammonium phosphates Nutrition 0.000 claims abstract description 10
- KLOIYEQEVSIOOO-UHFFFAOYSA-N carbocromen Chemical compound CC1=C(CCN(CC)CC)C(=O)OC2=CC(OCC(=O)OCC)=CC=C21 KLOIYEQEVSIOOO-UHFFFAOYSA-N 0.000 claims abstract description 10
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000019837 monoammonium phosphate Nutrition 0.000 claims abstract description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 10
- 239000002516 radical scavenger Substances 0.000 claims abstract description 10
- SLAMLWHELXOEJZ-UHFFFAOYSA-N 2-nitrobenzoic acid Chemical compound OC(=O)C1=CC=CC=C1[N+]([O-])=O SLAMLWHELXOEJZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims abstract description 9
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000011888 foil Substances 0.000 claims description 38
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 11
- 238000005470 impregnation Methods 0.000 claims description 10
- SUGXZLKUDLDTKX-UHFFFAOYSA-N 1-(2-nitrophenyl)ethanone Chemical compound CC(=O)C1=CC=CC=C1[N+]([O-])=O SUGXZLKUDLDTKX-UHFFFAOYSA-N 0.000 claims description 6
- UFBJCMHMOXMLKC-UHFFFAOYSA-N 2,4-dinitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O UFBJCMHMOXMLKC-UHFFFAOYSA-N 0.000 claims description 5
- CFBYEGUGFPZCNF-UHFFFAOYSA-N 2-nitroanisole Chemical compound COC1=CC=CC=C1[N+]([O-])=O CFBYEGUGFPZCNF-UHFFFAOYSA-N 0.000 claims description 5
- 235000015895 biscuits Nutrition 0.000 claims description 5
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 5
- 150000002989 phenols Chemical class 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 19
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 9
- 230000003321 amplification Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 235000019445 benzyl alcohol Nutrition 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- BTJIUGUIPKRLHP-UHFFFAOYSA-N 4-nitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1 BTJIUGUIPKRLHP-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- QQGISFDJEJMKIL-JAIQZWGSSA-N (5z)-5-[[3-(hydroxymethyl)thiophen-2-yl]methylidene]-10-methoxy-2,2,4-trimethyl-1h-chromeno[3,4-f]quinolin-9-ol Chemical compound C1=CC=2NC(C)(C)C=C(C)C=2C2=C1C=1C(OC)=C(O)C=CC=1O\C2=C/C=1SC=CC=1CO QQGISFDJEJMKIL-JAIQZWGSSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- GPEVMRFAFMVKHK-UHFFFAOYSA-N azane;dodecanedioic acid Chemical compound [NH4+].[NH4+].[O-]C(=O)CCCCCCCCCCC([O-])=O GPEVMRFAFMVKHK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 125000003010 ionic group Chemical group 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- QUSNBJAOOMFDIB-UHFFFAOYSA-N monoethyl amine Natural products CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000037303 wrinkles Effects 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
- H01G9/0029—Processes of manufacture
-
- 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
- H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
-
- 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
- H01G9/08—Housing; Encapsulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention discloses an aluminum electrolytic capacitor and a preparation method thereof. The preparation method comprises the following steps: (1) and (3) plain winding: (2) impregnating electrolyte, wherein in the electrolyte, a solvent consists of the following components in percentage by weight: 30-55% of diethylene glycol, 15-30% of 1, 2-ethylene glycol, 8-15% of benzyl alcohol, 2-10% of polyethylene glycol, 0.3-0.8% of ethylene glycol monobutyl ether and 5-15% of diethylene glycol methyl ether; the solute comprises the following components in percentage by weight: 40-60% of hexanediol ammonium, 10-26% of ammonium dihydrogen phosphate, 8-12% of ammonium pentaborate, 0.8-1.2% of diammonium hydrogen citrate, 0.3-0.5% of o-hydroxybenzoic acid and 15-25% of straight-chain ammonium carboxylate; the additive comprises the following components in percentage by weight: 45-62% of N, N-diethyl ethylamine, 15-25% of m-nitroacetophenone, 5-12% of polyvinyl alcohol, 8-10% of resorcinol, 5-8% of ammonium phosphate, 0.8-1.0% of nitrobenzoic acid and 0.3-0.5% of a hydrogen scavenger; (3) sealing and assembling; (4) and (5) an aging step. The preparation method of the invention improves the problems of narrow internal space and difficult heat dissipation of the aluminum electrolytic capacitor.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor and a preparation method thereof.
Background
With the rapid development of electronic devices, personalized electronic products are increasingly popular in the market, and the lightness, thinness, multifunctionality and personalization are inevitable development trends of future electronic products. The whole machine factory already sees the aiming head, so a large number of thin products are bright. The electronic components matched with the whole machine must also conform to the situation, which provides challenges for the size and the requirements of the aluminum electrolytic capacitor, and the products with the traditional structure cannot meet the requirements of the whole machine on lightness and thinness; the vibration-resistant aluminum electrolytic capacitor is produced under the requirement, and particularly, the vibration-resistant aluminum electrolytic capacitor is used as LED input filtering, and the capacitance demand of a switching power supply and vehicle-mounted electronics is large, so that the vibration-resistant aluminum electrolytic capacitor becomes a popular product in the market.
The existing market has the following defects for long (more than 30mm in height) aluminum electrolytic capacitors:
(1) the conventional glue fixing process is used for preventing the element from swinging, and the vibration resistance of the capacitor is insufficient in long-term work, namely the element is easy to swing in the vibration environment of the conventional capacitor, and the capacitor has the hidden troubles of open circuit and short circuit of a positive electrode and a negative electrode when used in the vibration environment;
(2) the traditional electrolyte, especially the electrolyte of a high-pressure traditional ammonium borate system, has narrow temperature range, and when the electrolyte is used for a long time, boric acid and glycol ester can generate water to cause leakage current to rise, the ripple resistance is not high, and the performance is not stable;
(3) the existing electrolyte has insufficient capability of inhibiting gas production, and the aluminum electrolytic capacitor has narrow internal space and is difficult to radiate heat, so that the product is easy to open a valve and leak liquid due to overlarge internal pressure caused by a large amount of gas production at high temperature;
(4) the aluminum electrolytic capacitor is high in height, and generally, the fixing glue is poured into the shell to prevent the element from swinging and shifting.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides an aluminum electrolytic capacitor and a preparation method thereof.
The technical problem to be solved by the invention is realized by the following technical scheme:
a preparation method of an aluminum electrolytic capacitor comprises the following steps:
(1) and (3) plain winding: interposing electrolytic paper between the anode foil and the cathode foil, and winding the electrolytic paper into a prime;
(2) impregnation with electrolyte: immersing the element in the step (1) into electrolyte for impregnation treatment, wherein the electrolyte comprises the following components in percentage by weight: 51-65% of solvent, 27-39% of solute and 5-10% of additive;
the solvent comprises the following components in percentage by weight: 30-55% of diethylene glycol, 15-30% of 1, 2-ethylene glycol, 8-15% of benzyl alcohol, 2-10% of polyethylene glycol, 0.3-0.8% of ethylene glycol monobutyl ether and 5-15% of diethylene glycol methyl ether;
the solute comprises the following components in percentage by weight: 40-60% of hexanediol ammonium, 10-26% of ammonium dihydrogen phosphate, 8-12% of ammonium pentaborate, 0.8-1.2% of diammonium hydrogen citrate, 0.3-0.5% of o-hydroxybenzoic acid and 15-25% of straight-chain ammonium carboxylate;
the additive comprises the following components in percentage by weight: 45-62% of N, N-diethyl ethylamine, 15-25% of m-nitroacetophenone, 5-12% of polyvinyl alcohol, 8-10% of resorcinol, 5-8% of ammonium phosphate, 0.8-1.0% of nitrobenzoic acid and 0.3-0.5% of a hydrogen scavenger;
(3) sealing and assembling: putting the biscuit in the step (2) into a shell, and then performing double-girdling seal assembly;
(4) and (5) an aging step.
As a preferred embodiment of the preparation method of the aluminum electrolytic capacitor provided by the invention, the hydrogen eliminating agent is formed by compounding a benzene ring compound with a nitro group and a phenol compound.
In a preferred embodiment of the aluminum electrolytic capacitor provided by the present invention, the benzene ring compound with a nitro group is one or two of o-nitroacetophenone and o-nitroanisole.
As a preferred embodiment of the method for manufacturing the aluminum electrolytic capacitor provided by the present invention, one or both of resorcinol and 2, 4-dinitrophenol are selected as the phenolic compound.
In the preparation method of the aluminum electrolytic capacitor, the adopted electrolyte adopts the combination of diethylene glycol, 1, 2-ethylene glycol, benzyl alcohol, polyethylene glycol, ethylene glycol monobutyl ether and diethylene glycol methyl ether, in particular diethylene glycol methyl ether, which belongs to a high-boiling-point organic solvent and has strong dissolving capacity. When working electrolyte is prepared, diethylene glycol methyl ether is added as an auxiliary solvent, so that satisfactory sparking voltage can be obtained, the voltage is increased from 470V to 508V, the solute solubility is increased from 1% to 15%, the sparking voltage is increased, and the effect of reducing the pressure in a capacitor is achieved.
The solute is mainly used for providing main components of positive ions, negative ions or ionic groups for repairing an oxide film and maintaining normal operation of a capacitor, and specifically, ammonium hexanediol, ammonium dihydrogen phosphate and ammonium pentaborate are used as main solutes, diammonium hydrogen citrate and o-hydroxybenzoic acid are used as auxiliary solutes, and a linear chain ammonium carboxylate salt is added, although the solubility of the linear chain ammonium carboxylate salt is not high, the linear chain ammonium carboxylate salt is ionized and adsorbed on the surface of a medium oxide film, so that a surface electric field is uniformly distributed, and the solute has certain help for improving a flash fire voltage and the high-temperature operation stability of an electrolyte. The addition of the linear chain ammonium carboxylate increases the esterification inhibiting capability under high temperature conditions, has good protection effect on carboxyl, and has strong protection on the polar foil when the linear chain ammonium carboxylate is adsorbed on the surface of the polar foil, so that the service temperature of the electrolyte can be widened in the working electrolyte, and the electrolyte has high sparking voltage.
The additive has the effects of regulating the viscosity and the conductivity of the electrolyte, improving the flash fire voltage, passivating an oxide film, inhibiting hydrogen and the like, and specifically, N-diethyl ethylamine, m-nitroacetophenone, polyvinyl alcohol, resorcinol and ammonium phosphate are selected. According to the invention, the nitro effect is improved by adding a proper amount of polyvinyl alcohol, the increase of saturated vapor pressure can be effectively inhibited, hydration and corrosion are prevented, the oxidation effect rate of the capacitor is further improved, the internal pressure of the capacitor is further reduced, and the stability of the product is improved.
When the aluminum electrolytic capacitor is subjected to oxidation-reduction reaction, hydrogen is inevitably generated at the negative electrode, so that a benzene ring substance with nitro is used as a hydrogen elimination agent. However, the excessive use of the benzene ring type substances with the nitro groups is easy to improve the frequency of electron emission, so that flash fire is easy to occur.
The invention selects the electrolyte of the mixed straight-chain ammonium carboxylate salt, diethylene glycol methyl ether and polyvinyl alcohol system, has excellent formation performance and extremely strong high-temperature stability and chemical stability, and can manufacture a capacitor product with high pressure resistance, high ripple, high heat resistance and long service life.
As a preferred embodiment of the method for manufacturing an aluminum electrolytic capacitor according to the present invention, the anode foil is a high withstand voltage low capacitance electrode foil.
In a preferred embodiment of the method for manufacturing an aluminum electrolytic capacitor according to the present invention, the high withstand voltage is a withstand voltage of 690VF or more, and the low specific volume is a specific volume of 0.45 μ F/cm2The following.
The anode foil is a key material of the aluminum electrolytic capacitor, the voltage resistance and the specific volume are directly related to the service life of the aluminum electrolytic capacitor, the anode foil has the characteristics of high voltage resistance and low specific volume, the higher the forming voltage of the selected anode foil is, the smaller the leakage current of the product is, the lower the specific volume of the anode foil is, the larger the area of the split sheet is, the lower the unit heating value is, and the great benefit is brought to the reduction of the loss of the product and the temperature rise.
As a preferred embodiment of the method for manufacturing the aluminum electrolytic capacitor provided by the present invention, the aluminum electrolytic capacitor refers to an aluminum electrolytic capacitor with a height greater than 30 mm.
As a preferred embodiment of the preparation method of the aluminum electrolytic capacitor provided by the invention, the aluminum electrolytic capacitor is an aluminum electrolytic capacitor with the height of 50-60 mm.
As a preferred embodiment of the method for manufacturing the aluminum electrolytic capacitor provided by the present invention, the aluminum electrolytic capacitor is an aluminum electrolytic capacitor with a height greater than 60 mm.
The aluminum electrolytic capacitor product with the height of more than 30mm is easy to displace in the manufacturing process flow and transportation process due to the large volume of the internal element, generally, a fixing agent is added into a capacitor shell to prevent the displacement of the element, the fixing agent is required to be preheated to 220-240 ℃ before being added to dissolve the fixing agent into liquid, then the liquid fixing agent is injected into the capacitor shell, the injection amount is required to be determined according to the external diameter size, the height and the volume of the element of the capacitor, the excessive injection influences the self heat dissipation and early failure of the capacitor, and the small injection cannot prevent the displacement of the element; moreover, because the temperature of the fixing agent is high, the manual injection is unsafe, and the production efficiency is low because 2 persons are required to operate simultaneously; aiming at the defects, the invention adopts a double-waist binding technology, realizes that the fixing element does not shake and shift without adding a fixing agent, has vibration resistance in the using process, is safe and reliable, and improves the efficiency.
An aluminum electrolytic capacitor is prepared by the preparation method.
A working electrolyte for an aluminum electrolytic capacitor comprises the following components in percentage by weight: 51-65% of solvent, 27-39% of solute and 5-10% of additive;
the solvent comprises the following components in percentage by weight: 30-55% of diethylene glycol, 15-30% of 1, 2-ethylene glycol, 8-15% of benzyl alcohol, 2-10% of polyethylene glycol, 0.3-0.8% of ethylene glycol monobutyl ether and 5-15% of diethylene glycol methyl ether;
the solute comprises the following components in percentage by weight: 40-60% of hexanediol ammonium, 10-26% of ammonium dihydrogen phosphate, 8-12% of ammonium pentaborate, 0.8-1.2% of diammonium hydrogen citrate, 0.3-0.5% of o-hydroxybenzoic acid and 15-25% of straight-chain ammonium carboxylate;
the additive comprises the following components in percentage by weight: 45-62% of N, N-diethyl ethylamine, 15-25% of m-nitroacetophenone, 5-12% of polyvinyl alcohol, 8-10% of resorcinol, 5-8% of ammonium phosphate, 0.8-1.0% of nitrobenzoic acid and 0.3-0.5% of a hydrogen scavenger.
As a preferable embodiment of the working electrolyte for the aluminum electrolytic capacitor provided by the invention, the dehydrogenation agent is formed by compounding a benzene ring compound with a nitro group and a phenol compound.
In a preferred embodiment of the working electrolyte for an aluminum electrolytic capacitor provided by the present invention, the benzene ring compound with a nitro group is one or two of o-nitroacetophenone and o-nitroanisole.
In a preferred embodiment of the working electrolyte for an aluminum electrolytic capacitor according to the present invention, the phenolic compound is one or both of resorcinol and 2, 4-dinitrophenol.
The invention has the following beneficial effects:
the aluminum electrolytic capacitor prepared by the invention solves the problems of narrow internal space and difficult heat dissipation of the aluminum electrolytic capacitor, solves the problem of easy leakage of a product valve due to overlarge internal pressure caused by a large amount of gas generated at high temperature, improves the ripple resistance and stabilizes the electrical property. The invention selects the electrolyte of a mixed straight-chain carboxylic acid ammonium salt + diethylene glycol methyl ether + polyvinyl alcohol system, compounds the benzene ring compound with the nitro group and the phenol compound to form the dehydrogenation agent, selects the anode foil with high pressure resistance and low specific capacity, combines the double-beam waist technology, realizes that the fixing agent is not added, the fixed element can not shake and shift, the use process is vibration resistant, the safety and the reliability are realized, the efficiency is improved, the prepared capacitor has excellent formation performance, strong high-temperature stability and chemical stability, and the capacitor product with high pressure resistance, high ripple, high heat resistance and long service life can be manufactured.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
An aluminum electrolytic capacitor 60mm high comprising the steps of:
(1) and (3) plain winding: interposing electrolytic paper between the anode foil and the cathode foil, and winding the electrolytic paper into a prime; wherein the anode foil is a high-withstand voltage low-capacitance electrode foil;
(2) impregnation with electrolyte: immersing the element in the step (1) into electrolyte for impregnation treatment, so that the electrolyte is fully immersed on the element; the electrolyte comprises the following components in percentage by weight: 58% of solvent, 34% of solute and 8% of additive;
the solvent comprises the following components in percentage by weight: diethylene glycol 45%, 1, 2-ethylene glycol 25%, benzyl alcohol 8.7%, polyethylene glycol 10%, ethylene glycol monobutyl ether 0.3% and diethylene glycol methyl ether 11%;
the solute comprises the following components in percentage by weight: 50% of hexanediol ammonium, 22.1% of ammonium dihydrogen phosphate, 11.5% of ammonium pentaborate, 1% of diammonium hydrogen citrate, 0.4% of o-hydroxybenzoic acid and 15% of linear chain carboxylic acid ammonium salt;
the additive comprises the following components in percentage by weight: 45% of N, N-diethyl ethylamine, 25% of m-nitroacetophenone, 12% of polyvinyl alcohol, 10% of resorcinol, 6.6% of ammonium phosphate, 1% of nitrobenzoic acid and 0.4% of a hydrogen scavenger; the hydrogen eliminating agent is compounded by o-nitroacetophenone and resorcinol;
(3) sealing and assembling: putting the biscuit in the step (2) into a shell, and then performing double-girdling seal assembly;
(4) and (5) an aging step.
Example 2
An aluminum electrolytic capacitor 50mm high comprising the steps of:
(1) and (3) plain winding: interposing electrolytic paper between the anode foil and the cathode foil, and winding the electrolytic paper into a prime; wherein the anode foil is a high-withstand voltage low-capacitance electrode foil;
(2) impregnation with electrolyte: immersing the element in the step (1) into electrolyte for impregnation treatment, so that the electrolyte is fully immersed on the element; the electrolyte comprises the following components in percentage by weight: 51% of solvent, 39% of solute and 10% of additive;
the solvent comprises the following components in percentage by weight: diethylene glycol 55%, 1, 2-ethylene glycol 15%, benzyl alcohol 15%, polyethylene glycol 5%, ethylene glycol monobutyl ether 0.5% and diethylene glycol methyl ether 9.5%;
the solute comprises the following components in percentage by weight: hexanediol ammonium 40%, ammonium dihydrogen phosphate 26%, ammonium pentaborate 7.9%, diammonium hydrogen citrate 0.8%, ortho-hydroxybenzoic acid 0.3% and linear ammonium carboxylate 25%;
the additive comprises the following components in percentage by weight: 62% of N, N-diethyl ethylamine, 15% of m-nitroacetophenone, 5% of polyvinyl alcohol, 8.9% of resorcinol, 8% of ammonium phosphate, 0.8% of nitrobenzoic acid and 0.3% of a hydrogen scavenger; the hydrogen eliminating agent is compounded by o-nitroanisole and 2, 4-dinitrophenol;
(3) sealing and assembling: putting the biscuit in the step (2) into a shell, and then performing double-girdling seal assembly;
(4) and (5) an aging step.
Example 3
An aluminum electrolytic capacitor 30mm high comprising the steps of:
(1) and (3) plain winding: interposing electrolytic paper between the anode foil and the cathode foil, and winding the electrolytic paper into a prime; wherein the anode foil is a high-withstand voltage low-capacitance electrode foil;
(2) impregnation with electrolyte: immersing the element in the step (1) into electrolyte for impregnation treatment, so that the electrolyte is fully immersed on the element; the electrolyte comprises the following components in percentage by weight: 65% of solvent, 27% of solute and 8% of additive;
the solvent comprises the following components in percentage by weight: 35% of diethylene glycol, 30% of 1, 2-ethylene glycol, 14% of benzyl alcohol, 5.2% of polyethylene glycol, 0.8% of ethylene glycol monobutyl ether and 15% of diethylene glycol methyl ether;
the solute comprises the following components in percentage by weight: 60% of hexanediol ammonium, 10% of ammonium dihydrogen phosphate, 12% of ammonium pentaborate, 1.2% of diammonium hydrogen citrate, 0.5% of o-hydroxybenzoic acid and 16.3% of linear chain carboxylic acid ammonium salt;
the additive comprises the following components in percentage by weight: 53 percent of N, N-diethyl ethylamine, 22.7 percent of m-nitroacetophenone, 10 percent of polyvinyl alcohol, 8 percent of resorcinol, 5 percent of ammonium phosphate, 0.8 percent of nitrobenzoic acid and 0.5 percent of hydrogen scavenger; the hydrogen remover is compounded by o-nitroanisole, resorcinol and 2, 4-dinitrophenol;
(3) sealing and assembling: putting the biscuit in the step (2) into a shell, and then performing double-girdling seal assembly;
(4) and (5) an aging step.
Comparative example 1
The preparation method of comparative example 1 is substantially the same as that of example 1 except that: the solvent comprises the following components in percentage by weight: diethylene glycol 45%, 1, 2-ethylene glycol 25%, benzyl alcohol 8.7%, polyethylene glycol 10%, ethylene glycol monobutyl ether 0.3%, and ethylene glycol 11%.
Comparative example 2
The preparation method of comparative example 2 is substantially the same as that of example 1 except that: the solute comprises the following components in percentage by weight: 50% of hexanediol ammonium, 22.1% of ammonium dihydrogen phosphate, 11.5% of ammonium pentaborate, 1% of diammonium hydrogen citrate, 0.4% of o-hydroxybenzoic acid and 15% of ammonium dodecanedioate.
Comparative example 3
The preparation method of comparative example 3 is substantially the same as that of example 1 except that: the additive comprises the following components in percentage by weight: 50% of N, N-diethyl ethylamine, 30% of m-nitroacetophenone, 12% of resorcinol, 6.6% of ammonium phosphate, 1% of nitrobenzoic acid and 0.4% of a hydrogen scavenger.
Comparative example 4
The preparation method of comparative example 4 is substantially the same as that of example 1 except that: the anode foil is a conventional electrode foil.
Comparative example 5
The preparation method of comparative example 5 is substantially the same as that of example 1 except that: the dehydrogenation agent is o-nitroacetophenone and p-nitrophenol.
Comparative example 6
The preparation method of comparative example 6 is substantially the same as that of example 1 except that: the hydrogen eliminating agent is resorcinol.
The electrical properties of the capacitors obtained in examples 1 to 3 and comparative examples 1 to 6 were measured and the data of the electrical properties after the ripple life test of 5000 hours were shown in the following table.
In the comparative example 1, diethylene glycol monomethyl ether is replaced by ethylene glycol, so that the sparking voltage of the electrolyte is low, the DF value is large, the capacity is obviously reduced after a ripple life test, the DF amplification is large, and the appearance is slightly bulged; in the comparative example 2, the linear chain ammonium carboxylate is replaced by the ammonium dodecadicarboxylate or other ammonium salts, so that the electrolyte has low sparking voltage, low high-temperature stability, large capacity reduction amplitude after ripple life test, large DF amplification and slightly-bulged appearance; in the comparative example 3, polyvinyl alcohol is omitted, so that the internal pressure cannot be reduced, the stability is not high, and the ripple life test is finished by bubbling due to gas generation, so that not only is the capacity reduced obviously, but also the DF amplification is large; in the comparative example 4, the anode foil is a conventional electrode foil, the anode foil without the characteristics of high withstand voltage and low specific capacity is selected as the anode foil, the electric leakage of the product is large, the loss stability of the product is not favorably reduced, the capacity is obviously reduced after a ripple life test, the DF amplification is large, and the appearance is slightly bulged; in the comparative example 5, the dehydrogenating agent is o-nitroacetophenone and p-nitrophenol, so that the generation of hydrogen can not be effectively inhibited, the product performance deterioration is low, the bottom bulging caused by gas generation after a ripple life test is prevented, the capacity is obviously reduced, and the DF amplification is large; in comparative example 6, the hydrogen scavenger is resorcinol, which inhibits insufficient gas generation capability, prevents low performance deterioration of the product, and prevents bottom bulging due to gas generation after ripple life test, not only the capacity is obviously reduced, but also the DF amplification is large.
The corset of example 1 was compared with a single-corset and a double-corset capacitor vibration test, and the test method specifically included: 1. fix the product to be measured and the vibration board, the condenser keeps pin and fixed position (PCB material board) distance H: 1.0 plus or minus 0.5mm, and ensuring that the distance between the capacitor body and a mounting point is 6mm plus or minus 1 mm; 2. fixing the vibration plate of the welded product on a vibration table, setting vibration tests according to requirements, wherein the vibration tests are carried out in each motion direction for 2 hours; 3. frequency range: 10HZ to 55HZ, amplitude: 0.75mm or acceleration 98m/s2, total duration: 8 h; 4. and (3) checking the appearance after completion: no visible damage and no electrolytic leakage and test characteristics (CAP, DF, LC).
By adopting the single beam waist, the capacity reduction range is large, the leakage current and the DF amplification are large after the vibration test, and the nail joint of the positive foil and the negative foil in the anatomical capacitor product has no defects of fracture, wrinkle and the like. After the double-beam waist design is carried out, the capacity reduction range is small, the DF and the LC have small change rates after a vibration test, and the defects of breakage, folding and the like do not exist at the nail joint of the positive foil and the negative foil in the anatomical capacitor product.
As shown in examples 1 to 3, the present invention selects an electrolyte of a mixed linear chain ammonium carboxylate salt + diethylene glycol methyl ether + polyvinyl alcohol system, compounds a benzene ring compound with a nitro group and a phenol compound to form a dehydrogenation agent, selects a high-withstand-voltage low-specific-capacity anode foil, and combines a double beam waist technology, such that a fixing agent is not required to be added, a fixed element is not shaken and displaced, the use process is vibration-resistant, safe and reliable, the efficiency is improved, the prepared capacitor has excellent formation performance, strong high temperature stability and chemical stability, and can produce a capacitor product with high pressure resistance, high ripple, high heat resistance and long service life.
The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (10)
1. A preparation method of an aluminum electrolytic capacitor is characterized by comprising the following steps:
(1) and (3) plain winding: interposing electrolytic paper between the anode foil and the cathode foil, and winding the electrolytic paper into a prime;
(2) impregnation with electrolyte: immersing the element in the step (1) into electrolyte for impregnation treatment, wherein the electrolyte comprises the following components in percentage by weight: 51-65% of solvent, 27-39% of solute and 5-10% of additive;
the solvent comprises the following components in percentage by weight: 30-55% of diethylene glycol, 15-30% of 1, 2-ethylene glycol, 8-15% of benzyl alcohol, 2-10% of polyethylene glycol, 0.3-0.8% of ethylene glycol monobutyl ether and 5-15% of diethylene glycol methyl ether;
the solute comprises the following components in percentage by weight: 40-60% of hexanediol ammonium, 10-26% of ammonium dihydrogen phosphate, 8-12% of ammonium pentaborate, 0.8-1.2% of diammonium hydrogen citrate, 0.3-0.5% of o-hydroxybenzoic acid and 15-25% of straight-chain ammonium carboxylate;
the additive comprises the following components in percentage by weight: 45-62% of N, N-diethyl ethylamine, 15-25% of m-nitroacetophenone, 5-12% of polyvinyl alcohol, 8-10% of resorcinol, 5-8% of ammonium phosphate, 0.8-1.0% of nitrobenzoic acid and 0.3-0.5% of a hydrogen scavenger;
(3) sealing and assembling: putting the biscuit in the step (2) into a shell, and then performing double-girdling seal assembly;
(4) and (5) an aging step.
2. The method for manufacturing an aluminum electrolytic capacitor as recited in claim 1, wherein the anode foil is a high withstand voltage low capacitance electrode foil.
3. The method for manufacturing an aluminum electrolytic capacitor according to claim 1, wherein the high withstand voltage is 690VF or more, and the low specific volume is 0.45 μ F/cm2The following.
4. The method for manufacturing an aluminum electrolytic capacitor as claimed in claim 1, wherein the aluminum electrolytic capacitor is an aluminum electrolytic capacitor having a height of more than 30 mm.
5. The method for preparing the aluminum electrolytic capacitor as claimed in claim 1, wherein the aluminum electrolytic capacitor is an aluminum electrolytic capacitor with a height of 50-60 mm.
6. The method for manufacturing an aluminum electrolytic capacitor as recited in claim 1, wherein the dehydrogenation agent is a benzene ring compound and a phenol compound having a nitro group.
7. The method for preparing the aluminum electrolytic capacitor as claimed in claim 1, wherein the benzene ring compound with the nitro group is o-nitroacetophenone and/or o-nitroanisole.
8. The method for preparing the aluminum electrolytic capacitor as claimed in claim 1, wherein the phenolic compound is resorcinol and/or 2, 4-dinitrophenol.
9. An aluminum electrolytic capacitor produced by the production method according to any one of claims 1 to 9.
10. The working electrolyte for the aluminum electrolytic capacitor is characterized by comprising the following components in percentage by weight: 51-65% of solvent, 27-39% of solute and 5-10% of additive;
the solvent comprises the following components in percentage by weight: 30-55% of diethylene glycol, 15-30% of 1, 2-ethylene glycol, 8-15% of benzyl alcohol, 2-10% of polyethylene glycol, 0.3-0.8% of ethylene glycol monobutyl ether and 5-15% of diethylene glycol methyl ether;
the solute comprises the following components in percentage by weight: 40-60% of hexanediol ammonium, 10-26% of ammonium dihydrogen phosphate, 8-12% of ammonium pentaborate, 0.8-1.2% of diammonium hydrogen citrate, 0.3-0.5% of o-hydroxybenzoic acid and 15-25% of straight-chain ammonium carboxylate;
the additive comprises the following components in percentage by weight: 45-62% of N, N-diethyl ethylamine, 15-25% of m-nitroacetophenone, 5-12% of polyvinyl alcohol, 8-10% of resorcinol, 5-8% of ammonium phosphate, 0.8-1.0% of nitrobenzoic acid and 0.3-0.5% of a hydrogen scavenger.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280385A (en) * | 2014-06-11 | 2016-01-27 | 东莞市东阳光电容器有限公司 | Working electrolyte for slender-type high-voltage aluminum electrolyte capacitors |
| CN108074748A (en) * | 2017-12-15 | 2018-05-25 | 肇庆绿宝石电子科技股份有限公司 | A kind of special solid-state capacitor manufacturing method of vehicle electronics |
| CN110993346A (en) * | 2019-11-22 | 2020-04-10 | 肇庆绿宝石电子科技股份有限公司 | Ultra-low impedance aluminum electrolytic capacitor for switching power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280385A (en) * | 2014-06-11 | 2016-01-27 | 东莞市东阳光电容器有限公司 | Working electrolyte for slender-type high-voltage aluminum electrolyte capacitors |
| CN108074748A (en) * | 2017-12-15 | 2018-05-25 | 肇庆绿宝石电子科技股份有限公司 | A kind of special solid-state capacitor manufacturing method of vehicle electronics |
| CN110993346A (en) * | 2019-11-22 | 2020-04-10 | 肇庆绿宝石电子科技股份有限公司 | Ultra-low impedance aluminum electrolytic capacitor for switching power supply |
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