CN111653431A - Ultralow temperature aluminum electrolytic capacitor and manufacturing method thereof - Google Patents
Ultralow temperature aluminum electrolytic capacitor and manufacturing method thereof Download PDFInfo
- Publication number
- CN111653431A CN111653431A CN202010519034.7A CN202010519034A CN111653431A CN 111653431 A CN111653431 A CN 111653431A CN 202010519034 A CN202010519034 A CN 202010519034A CN 111653431 A CN111653431 A CN 111653431A
- Authority
- CN
- China
- Prior art keywords
- solvent
- aluminum electrolytic
- electrolytic capacitor
- voltage
- manufacturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 73
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000002904 solvent Substances 0.000 claims abstract description 71
- 230000032683 aging Effects 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000011888 foil Substances 0.000 claims abstract description 31
- 239000003792 electrolyte Substances 0.000 claims abstract description 29
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005470 impregnation Methods 0.000 claims abstract description 12
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000005695 Ammonium acetate Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 235000019257 ammonium acetate Nutrition 0.000 claims abstract description 11
- 229940043376 ammonium acetate Drugs 0.000 claims abstract description 11
- KWIPUXXIFQQMKN-UHFFFAOYSA-N 2-azaniumyl-3-(4-cyanophenyl)propanoate Chemical compound OC(=O)C(N)CC1=CC=C(C#N)C=C1 KWIPUXXIFQQMKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229940090948 ammonium benzoate Drugs 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 7
- 229920001971 elastomer Polymers 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 18
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 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 6
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 6
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 6
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 6
- 239000011975 tartaric acid Substances 0.000 claims description 6
- 235000002906 tartaric acid Nutrition 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000011859 microparticle Substances 0.000 claims description 5
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 5
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004254 Ammonium phosphate Substances 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
- 229940028356 diethylene glycol monobutyl ether Drugs 0.000 claims description 3
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 14
- 239000012046 mixed solvent Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- ATHHXGZTWNVVOU-UHFFFAOYSA-N N-methylformamide Chemical compound CNC=O ATHHXGZTWNVVOU-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- ZRIUUUJAJJNDSS-UHFFFAOYSA-N ammonium phosphates Chemical compound [NH4+].[NH4+].[NH4+].[O-]P([O-])([O-])=O ZRIUUUJAJJNDSS-UHFFFAOYSA-N 0.000 description 3
- 239000010407 anodic oxide Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 2
- 239000001741 Ammonium adipate Substances 0.000 description 2
- 235000019293 ammonium adipate Nutrition 0.000 description 2
- -1 ammonium carboxylates Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- 238000007614 solvation Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- GJYJYFHBOBUTBY-UHFFFAOYSA-N alpha-camphorene Chemical compound CC(C)=CCCC(=C)C1CCC(CCC=C(C)C)=CC1 GJYJYFHBOBUTBY-UHFFFAOYSA-N 0.000 description 1
- VWSRWGFGAAKTQG-UHFFFAOYSA-N ammonium benzoate Chemical compound [NH4+].[O-]C(=O)C1=CC=CC=C1 VWSRWGFGAAKTQG-UHFFFAOYSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- RATMLZHGSYTFBL-UHFFFAOYSA-N azanium;6-hydroxy-6-oxohexanoate Chemical compound N.OC(=O)CCCCC(O)=O RATMLZHGSYTFBL-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003586 protic polar solvent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation 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
- H01G9/145—Liquid electrolytic capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
-
- 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
- H01G9/02—Diaphragms; Separators
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention discloses an ultralow temperature aluminum electrolytic capacitor and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: (1) winding a core package: an electrolytic paper is interposed between the anode foil and the cathode foil and wound into a core package; (2) impregnation: immersing the wound core package into electrolyte for impregnation treatment; (3) and (3) packaging: sealing the impregnated core bag into the shell and the rubber plug; (4) aging; the electrolyte comprises the following components in percentage by weight: 47-62% of solvent, 20-35% of solute and 10-18% of additive, wherein the solvent comprises a main solvent, a secondary solvent and a secondary solvent, and the solute comprises ammonium formate, ammonium acetate, ammonium diacid and ammonium benzoate. The aluminum electrolytic capacitor prepared by the method has good temperature performance and stability so as to respond to complicated and variable natural environments, and the electrolyte in the capacitor is not frozen and the electrical performance is not weakened.
Description
Technical Field
The invention relates to the technical field of capacitor manufacturing, in particular to an ultralow-temperature aluminum electrolytic capacitor and a manufacturing method thereof.
Background
With the development of the electronic industry, the requirements of electronic devices on environmental temperature adaptability (cold resistance and heat resistance) are higher and higher, especially, the applications of outdoor integrated machines (such as LEDs, energy saving lamps, ballasts, driving power supplies, switching power supplies and the like) are also higher and higher, and with the continuous development of technologies and the optimization of cost, LEDs, driving power supplies, power switches and the like are continuously developed towards good low-temperature resistance.
Aluminum electrolytic capacitors are the most widely used basic components in electronic products. In recent years, with the rapid development of scientific technology and electronic industry, various outdoor electrical products and equipment are continuously developed, and electrical equipment is required to have good temperature performance and stability to cope with complex and variable natural environments. These demands have greatly expanded the market for low temperature resistant aluminum electrolytic capacitors, while also presenting new challenges to the performance of aluminum electrolytic capacitor products.
At present, in the design of an aluminum electrolytic capacitor used for an LED, under the environment of ultralow temperature such as-55 ℃, liquid electrolyte is easy to solidify, the conductivity is obviously reduced, and the impedance of the capacitor is rapidly increased. Under the condition of extremely low temperature, the liquid capacitor also has a short plate, for example, the activity can be weakened, the electrical performance played on the circuit can also be weakened, the customer generally encounters the phenomenon that the electrical appliance is started slowly or can not be started, the main reason is that the capacitor is subjected to the condition of environmental temperature, the capacity is reduced, chemical components in electrolyte of the main component of the capacitor generate the solidification and crystallization phenomenon at the low-temperature environmental temperature, the electrical characteristics of the capacitor are influenced, the capacitor can not play the original functions, and the whole machine does not run.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides the ultralow-temperature aluminum electrolytic capacitor and the manufacturing method thereof. The electrolyte disclosed by the invention is a mixed solvent system of a main solvent, an auxiliary solvent and water, the high-low temperature characteristics of the product can be improved, the lower limit of the working temperature can reach-55 ℃, small-molecule easily-ionized organic ammonium carboxylates such as ammonium formate and ammonium acetate are selected as main solutes in the aspect of solute, and ammonium adipate and ammonium benzoate are added as auxiliary solutes, so that the conductivity of the electrolyte can be increased, and the chemical stability of the electrolyte can be improved.
The technical problem to be solved by the invention is realized by the following technical scheme:
in one aspect, a method for manufacturing an ultra-low temperature aluminum electrolytic capacitor comprises the following steps:
(1) winding a core package: an electrolytic paper is interposed between the anode foil and the cathode foil and wound into a core package;
(2) impregnation: immersing the wound core package into electrolyte for impregnation treatment;
(3) and (3) packaging: sealing the impregnated core bag into the shell and the rubber plug;
(4) aging;
the electrolyte comprises the following components in percentage by weight: 47-62% of solvent, 20-35% of solute and 10-18% of additive, wherein the solvent comprises a main solvent, an auxiliary solvent and a secondary solvent, the main solvent is one or more of ethylene glycol, diethylene glycol, propylene glycol and diethylene glycol monomethyl ether, the secondary solvent is one or more of diethylene glycol, N-dimethylformamide, gamma-butyrolactone and diethylene glycol monobutyl ether, and the secondary solvent is water.
In one embodiment of the method for manufacturing an ultra-low temperature aluminum electrolytic capacitor according to the present invention, the weight percentages of the main solvent, the sub-solvent and the sub-solvent in the solvent are 40 to 65%, 30 to 50% and 15 to 20%, respectively. The conductivity of the water is not more than 1 us/cm.
The selection of the solvent is very important because the boiling point and vapor pressure of the solvent determine the temperature range of the electrolyte and the degree of ionization and solvation of the solution. The ethylene glycol is a protic solvent, has a strong solvation effect on a solute and can well dissolve the organic carboxylic acid and the ammonium salt thereof. N-methylformamide, boiling point: 198-: the temperature is-4 ℃, and higher conductivity can be obtained under the condition that the water content is not too high, so that the generation of hydration is effectively inhibited. The water counter electrode has good wettability with electrolyte, can enhance self-healing property for anodic oxide film, and has low price. And the ethylene glycol, the N-methylformamide and the water form intermolecular hydrogen bonds, so that the boiling point of the mixed solvent is higher than that of the pure solvent, the saturated vapor pressure of the mixed solvent is reduced, and the bad air blowing of the capacitor in a high-temperature load test is avoided. The formation of hydrogen bonds also lowers the freezing point of the mixed solvent, is beneficial to improving the high-temperature and low-temperature characteristics of the product, and the lower limit of the working temperature can reach-55 ℃.
As an embodiment of the method for manufacturing an ultra-low temperature aluminum electrolytic capacitor provided by the present invention, the weight percentages of the ammonium formate, the ammonium acetate, the ammonium diacid and the ammonium benzoate are respectively: 30-50%, 25-45%, 10-20% and 5-8%.
The ammonium formate and the ammonium acetate have high solubility in glycol and water, and the working electrolyte with high concentration and high conductivity can be easily prepared. The ammonium formate is a polymerization inhibitor for alcohol polymerization, and the ammonium formate is added into the ethylene glycol mixed solvent, so that the conductivity can be improved, and the function of the polymerization inhibitor can be realized. The adipic acid ammonium and the benzoic acid ammonium have good high-temperature stability, and not only can increase the conductivity of the electrolyte, but also can improve the chemical stability of the electrolyte.
As an embodiment of the manufacturing method of the ultralow temperature aluminum electrolytic capacitor provided by the invention, the additive comprises the following components in percentage by weight: 40-60% of ethylenediamine tetraacetic acid, 25-45% of tartaric acid, 10-15% of citric acid, 2-6.2% of ammonium phosphate, 1-5% of ammonium dihydrogen phosphate and 0.8-1.5% of hypophosphorous acid. At least one of organic compounds containing a plurality of carboxylate radicals, such as ethylenediamine tetraacetic acid, tartaric acid, citric acid and the like, can inhibit anode corrosion. Ammonium phosphate, ammonium dihydrogen phosphate, ammonium hypophosphite and the like, can prevent the anodic oxide film from generating hydration reaction, and reduces the leakage current of the product.
In one embodiment of the method for manufacturing an ultra-low temperature aluminum electrolytic capacitor according to the present invention, the electrolytic paper has a water-soluble chloride content<2mg/kg, iron micro-particles > 0.1mm2The liquid absorption height value: 21mm/10 min. Preferably, the electrolytic paper is a double-layer fiber composite paper.
The electrolytic paper is used as an adsorption carrier of the electrolyte, and forms a cathode of the electrolytic capacitor together with the electrolyte, and plays a role in isolating the two electrode foils. Therefore, the electrolytic paper is required to have not only severe physical requirements and extremely high chemical purity but also excellent electrical properties. The electrolytic paper made of the materials can improve the liquid absorption effect of the fibers, so that the electrolytic paper has good permeability and the low loss performance of the capacitor is ensured.
As an embodiment of the manufacturing method of the ultra-low temperature aluminum electrolytic capacitor provided by the invention, the aging step adopts a constant current and voltage adjustment method to perform aging treatment so as to reduce leakage current of the product and ensure reliability of the product.
The aging step is a key process for producing the aluminum electrolytic capacitor, and is carried out under the conditions of lower voltage and lower current, and the change process of the total current is as follows: rise → maximum → fall → minimum → constant, the best high temperature aging time is when the minimum current is reached (2 h after the rated temperature is reached).
In one embodiment of the method for manufacturing an ultra-low temperature aluminum electrolytic capacitor according to the present invention, the constant current voltage adjustment method specifically includes: a constant current and voltage adjustment method, namely a sectional boosting aging method, is adopted, and specifically comprises the following steps: applying a preset first-stage voltage to the capacitor, stabilizing the voltage for a period of time, reducing the current to below 1/3 of the set aging current, boosting the voltage and applying a preset next-stage voltage to the capacitor, increasing the current, stabilizing the voltage for a period of time, reducing the current to below 1/3 of the set aging current, and repeating boosting adjustment until the voltage indicated by the voltmeter is equal to the aging voltage. The aging voltage value is set to be 1.02-1.15 times of the rated voltage of the capacitor; the aging current value is set as: 0.3 lot number PCS/1000.
It should be noted that the voltage values of the first-stage voltage preset and the next-stage voltage preset … in the aging method are not particularly limited, and the voltage may be stepped up according to the aging voltage value or the rated voltage in actual implementation, which is not described herein again for example.
On the other hand, an ultra-low temperature aluminum electrolytic capacitor is manufactured by the manufacturing method of the ultra-low temperature aluminum electrolytic capacitor.
The invention has the following beneficial effects:
the aluminum electrolytic capacitor prepared by the method has good temperature performance and stability so as to respond to complicated and variable natural environments, and the electrolyte in the capacitor is not frozen and the electrical performance is not weakened. The electrolyte disclosed by the invention is a mixed solvent system of a main solvent, an auxiliary solvent and water, the high-low temperature characteristics of the product can be improved, the lower limit of the working temperature can reach-55 ℃, small-molecule easily-ionized organic ammonium carboxylates such as ammonium formate and ammonium acetate are selected as main solutes in the aspect of solute, and ammonium adipate and ammonium benzoate are added as auxiliary solutes, so that the conductivity of the electrolyte can be increased, and the chemical stability of the electrolyte can be improved.
Furthermore, through a plurality of times of experimental researches of the inventor, the inventor unexpectedly discovers that the scientific and reasonable combination of the material selection of the electrolytic paper, the compounding of the electrolyte and the specific aging treatment plays a synergistic role in improving the high-low temperature characteristics (the lower limit of the working temperature can reach-55 ℃), preventing the hydration reaction of the anodic oxide film, reducing the leakage current of the product, ensuring the low loss performance of the product and ensuring the reliability of the product.
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. For convenience of explanation, the specification of the aluminum electrolytic capacitor of each comparative example of the following examples is 100V680 μ F, and the number of produced capacitors is 300, and the specification and the number of capacitors are only for convenience of illustration and are not a specific limitation of the present invention, and the present invention can be applied to capacity: 10-8200 UF, voltage: 6.3 to 100V capacitors.
Example 1
The embodiment provides a manufacturing method of an ultralow-temperature aluminum electrolytic capacitor, which specifically comprises the following steps:
(1) winding a core package: and interposing electrolytic paper between the anode foil and the cathode foil, and winding to form a core package, wherein the anode foil and the cathode foil have the same width, so that the upper end part of the anode foil in the core package exceeds the electrolytic paper and the cathode foil to be exposed, the lower end part of the cathode foil exceeds the electrolytic paper and the anode foil to be exposed, and the wound core package is surrounded, adhered and fixed by adhesive tape.
Wherein the electrolytic paper is double-layer fiber composite paper with water-soluble chloride content<2mg/kg, iron micro-particles > 0.1mm2The liquid absorption height value: 21mm/10 min.
(2) Impregnation: and immersing the wound core package into electrolyte for impregnation treatment. Wherein,
the electrolyte comprises the following components in percentage by weight: 47% of solvent, 35% of solute and 18% of additive; the solvent comprises the following components in percentage by weight: the composite solvent comprises 45% of a main solvent, 35% of an auxiliary solvent and 20% of a secondary solvent, wherein the main solvent is ethylene glycol, the secondary solvent is N-dimethylformamide, and the secondary solvent is water with the conductivity not more than 1 us/cm.
The solute comprises the following components in percentage by weight: 30% of ammonium formate, 45% of ammonium acetate, 20% of ammonium diacid and 5% of ammonium benzoate.
The additive comprises the following components in percentage by weight: 60% of ethylenediamine tetraacetic acid, 25% of tartaric acid, 10% of citric acid, 3% of ammonium phosphate salt, 1% of ammonium dihydrogen phosphate and 1% of hypophosphorous acid.
(3) And (3) packaging: and (4) putting the impregnated core bag into the shell and sealing the rubber plug.
(4) And (3) aging: the aging treatment is carried out by adopting a constant current and voltage adjustment method, and the method specifically comprises the following steps: three-stage boosting constant-current aging is adopted, specifically, the first stage aging: applying a preset first-stage voltage (the voltage value is 58V) to the capacitor at normal temperature, stabilizing the voltage for a period of time, and performing second-stage aging after the current is reduced to 1/3 of the aging current; and (3) second-stage aging: applying a preset second-stage voltage (the voltage value is 90V) to the capacitor at the temperature of 85-105 ℃, stabilizing the voltage for a period of time, and performing third-stage aging after the current is reduced to 1/3 of the aging current; third stage aging: at normal temperature, a predetermined third voltage (115V) is applied to the capacitor for voltage stabilization until the voltage indicated by the voltmeter is equal to the aging voltage.
Example 2
The embodiment provides a manufacturing method of an ultralow-temperature aluminum electrolytic capacitor, which specifically comprises the following steps:
(1) winding a core package: and interposing electrolytic paper between the anode foil and the cathode foil, and winding to form a core package, wherein the anode foil and the cathode foil have the same width, so that the upper end part of the anode foil in the core package exceeds the electrolytic paper and the cathode foil to be exposed, the lower end part of the cathode foil exceeds the electrolytic paper and the anode foil to be exposed, and the wound core package is surrounded, adhered and fixed by adhesive tape.
Wherein the electrolytic paper is double-layer fiber composite paper with water-soluble chloride content<2mg/kg, iron micro-particles > 0.1mm2The liquid absorption height value: 21mm/10 min.
(2) Impregnation: and immersing the wound core package into electrolyte for impregnation treatment. Wherein,
the electrolyte comprises the following components in percentage by weight: 58% of solvent, 32% of solute and 10% of additive; the solvent comprises the following components in percentage by weight: the composite solvent comprises 40% of a main solvent, 45% of an auxiliary solvent and 15% of a secondary solvent, wherein the main solvent is ethylene glycol and propylene glycol, the secondary solvent is N-dimethylformamide and gamma-butyrolactone, and the secondary solvent is water with the conductivity not more than 1 us/cm.
The solute comprises the following components in percentage by weight: ammonium formate 50%, ammonium acetate 25%, ammonium diacid 20% and ammonium benzoate 5%.
The additive comprises the following components in percentage by weight: 40% of ethylenediamine tetraacetic acid, 45% of tartaric acid, 10% of citric acid, 2% of ammonium phosphate salt, 1.5% of ammonium dihydrogen phosphate and 1.5% of hypophosphorous acid.
(3) And (3) packaging: and (4) putting the impregnated core bag into the shell and sealing the rubber plug.
(4) And (3) aging: the aging treatment is carried out by adopting a constant current and voltage adjustment method, and the method specifically comprises the following steps: three-stage boosting constant-current aging is adopted, specifically, the first stage aging: applying a preset first-stage voltage (the voltage value is 58V) to the capacitor at normal temperature, stabilizing the voltage for a period of time, and performing second-stage aging after the current is reduced to 1/3 of the aging current; and (3) second-stage aging: applying a preset second-stage voltage (the voltage value is 90V) to the capacitor at the temperature of 85-105 ℃, stabilizing the voltage for a period of time, and performing third-stage aging after the current is reduced to 1/3 of the aging current; third stage aging: at normal temperature, a predetermined third voltage (115V) is applied to the capacitor for voltage stabilization until the voltage indicated by the voltmeter is equal to the aging voltage.
Example 3
The embodiment provides a manufacturing method of an ultralow-temperature aluminum electrolytic capacitor, which specifically comprises the following steps:
(1) winding a core package: and interposing electrolytic paper between the anode foil and the cathode foil, and winding to form a core package, wherein the anode foil and the cathode foil have the same width, so that the upper end part of the anode foil in the core package exceeds the electrolytic paper and the cathode foil to be exposed, the lower end part of the cathode foil exceeds the electrolytic paper and the anode foil to be exposed, and the wound core package is surrounded, adhered and fixed by adhesive tape.
Wherein the electrolytic paper is double-layer fiber composite paper with water-soluble chloride content<2mg/kg, iron micro-particles > 0.1mm2The liquid absorption height value: 21mm/10 min.
(2) Impregnation: and immersing the wound core package into electrolyte for impregnation treatment. Wherein,
the electrolyte comprises the following components in percentage by weight: 62% of solvent, 20% of solute and 18% of additive; the solvent comprises the following components in percentage by weight: the composite solvent comprises 60% of a main solvent, 30% of an auxiliary solvent and 10% of a secondary solvent, wherein the main solvent is ethylene glycol, diethylene glycol, propylene glycol and diethylene glycol monomethyl ether, the secondary solvent is diethylene glycol, N-dimethylformamide, gamma-butyrolactone and diethylene glycol monobutyl ether, and the secondary solvent is water with the conductivity of not more than 1 us/cm.
The solute comprises the following components in percentage by weight: 45% of ammonium formate, 37% of ammonium acetate, 10% of ammonium diacid and 8% of ammonium benzoate.
The additive comprises the following components in percentage by weight: 48% of ethylenediamine tetraacetic acid, 25% of tartaric acid, 15% of citric acid, 6.2% of ammonium phosphate salt, 5% of ammonium dihydrogen phosphate and 0.8% of hypophosphorous acid.
(3) And (3) packaging: and (4) putting the impregnated core bag into the shell and sealing the rubber plug.
(4) And (3) aging: the aging treatment is carried out by adopting a constant current and voltage adjustment method, and the method specifically comprises the following steps: three-stage boosting constant-current aging is adopted, specifically, the first stage aging: applying a preset first-stage voltage (the voltage value is 58V) to the capacitor at normal temperature, stabilizing the voltage for a period of time, and performing second-stage aging after the current is reduced to 1/3 of the aging current; and (3) second-stage aging: applying a preset second-stage voltage (the voltage value is 90V) to the capacitor at the temperature of 85-105 ℃, stabilizing the voltage for a period of time, and performing third-stage aging after the current is reduced to 1/3 of the aging current; third stage aging: at normal temperature, a predetermined third voltage (115V) is applied to the capacitor for voltage stabilization until the voltage indicated by the voltmeter is equal to the aging voltage.
Comparative example 1
This comparative example differs from example 2 in that: the solvent component does not include water.
Comparative example 2
This comparative example differs from example 2 in that: the solute is free of ammonium formate and ammonium acetate, i.e., the solute consists of ammonium diacid and ammonium benzoate.
Comparative example 3
This comparative example differs from example 2 in that: and the aging step adopts a conventional constant voltage and current adjustment method to perform aging treatment.
Comparative example 4
This comparative example differs from example 2 in that: the proportion of the secondary solvent (water) is 20%.
10 capacitors were used for each of examples 1 to 3 and comparative examples 1 to 4, and subjected to high-low temperature characteristic tests at 20 ℃ or-55 ℃ for 2 hours, and then to low temperature tests of capacity, ESR, impedance (Z), and loss change rate.
The above data are the average of 10 test data each.
The test results show that the aluminum electrolytic capacitors in examples 1-3 are qualified in the ratio of the impedance at-55 ℃ to the impedance at 20 ℃ and are all obviously lower than the impedance ratios in comparative examples 1-4, and the rate of change of the capacitance of the aluminum electrolytic capacitors in examples 1-3 relative to the capacitance at normal temperature and 20 ℃ under the low temperature condition of-55 ℃ is all obviously lower than the rate of change of the capacitance in comparative examples 1-4. In addition, the content of the secondary solvent water cannot be too much, for example, after the water content is adjusted to 20% in the comparative example, hydration reaction is easy to occur to reduce the leakage current of the product, the boiling point of the mixed solvent is lower than that of the pure solvent, and the saturated vapor pressure is increased, so that the poor air blowing of the capacitor in a high-temperature load test is caused, as shown in the table above, compared with example 2, in the comparative example 4, the change rate of the electrostatic capacity, the leakage current, the loss change rate and the impedance are obviously improved by 1.3-1.5 times in a-55 low-temperature environment, and the low-temperature quality of the capacitor product is greatly influenced.
It can be seen that the lack of water solvent, the absence of solute modification, and the absence of aging process modification all result in the aluminum electrolytic capacitor having low electrostatic capacity, high ESR, and high impedance at-55 c, demonstrating that the best technical results can be obtained only by using these processing and/or processing parameters simultaneously.
It can be understood that the technical effect of the invention is the sum of the synergistic effect of the technical characteristics of each step, and each step has certain internal correlation, and is not the simple superposition of the effects of the single technical characteristics. The invention can obviously improve the capacity characteristic of the capacitor under the condition of low temperature (-55 ℃) and effectively improve the low temperature resistance of the aluminum electrolytic capacitor by (1) reasonably adding water solvents into the main solvent and the auxiliary solvent, (2) reasonably adopting ammonium formate and ammonium acetate as main solutes and (3) adopting a constant current voltage-regulating aging method. The above effects produced by the present invention are obtained by the mutual synergy, and are inseparable.
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. The manufacturing method of the ultralow temperature aluminum electrolytic capacitor is characterized by comprising the following steps
(1) Winding a core package: an electrolytic paper is interposed between the anode foil and the cathode foil and wound into a core package;
(2) impregnation: immersing the wound core package into electrolyte for impregnation treatment;
(3) and (3) packaging: sealing the impregnated core bag into the shell and the rubber plug;
(4) aging;
the electrolyte comprises the following components in percentage by weight: 47-62% of solvent, 20-35% of solute and 10-18% of additive, wherein the solvent comprises a main solvent, an auxiliary solvent and a secondary solvent, the main solvent is one or more of ethylene glycol, diethylene glycol, propylene glycol and diethylene glycol monomethyl ether, the secondary solvent is one or more of diethylene glycol, N-dimethylformamide, gamma-butyrolactone and diethylene glycol monobutyl ether, and the secondary solvent is water.
2. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as claimed in claim 1, wherein the weight percentages of the main solvent, the sub-solvent and the sub-solvent in the solvent are 40 to 65%, 30 to 50% and 15 to 20%, respectively.
3. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as claimed in claim 1, wherein the weight percentages of the ammonium formate, ammonium acetate, ammonium diacid and ammonium benzoate in the solute are respectively: 30-50%, 25-45%, 10-20% and 5-8%.
4. The manufacturing method of the ultra-low temperature aluminum electrolytic capacitor as claimed in claim 3, wherein the additive comprises the following components by weight percent: 40-60% of ethylenediamine tetraacetic acid, 25-45% of tartaric acid, 10-15% of citric acid, 2-6.2% of ammonium phosphate, 1-5% of ammonium dihydrogen phosphate and 0.8-1.5% of hypophosphorous acid.
5. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as recited in claim 1, wherein the electrical conductivity of the water is not more than 1 us/cm.
6. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as claimed in claim 1, wherein the electrolytic paper has a water-soluble chloride content<2mg/kg, iron micro-particles > 0.1mm2The liquid absorption height value: 21mm/10 min.
7. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as claimed in claim 6, wherein the electrolytic paper is a double-layered fiber composite paper.
8. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as claimed in claim 1, wherein the aging step is an aging treatment using a constant current and voltage adjustment method.
9. The method for manufacturing an ultra-low temperature aluminum electrolytic capacitor as claimed in claim 8, wherein the constant current voltage adjustment method specifically comprises: a constant current and voltage adjusting method, namely a sectional boosting constant current aging method, is adopted, and specifically comprises the following steps: applying a preset first-stage voltage to the capacitor, stabilizing the voltage for a period of time, reducing the current to below 1/3 of the set aging current, boosting the voltage and applying a preset next-stage voltage to the capacitor, increasing the current, stabilizing the voltage for a period of time, reducing the current to below 1/3 of the set aging current, and repeating boosting adjustment until the voltage indicated by the voltmeter is equal to the aging voltage.
10. An ultra-low temperature aluminum electrolytic capacitor produced by the method for producing an ultra-low temperature aluminum electrolytic capacitor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519034.7A CN111653431B (en) | 2020-06-09 | 2020-06-09 | Ultralow temperature aluminum electrolytic capacitor and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519034.7A CN111653431B (en) | 2020-06-09 | 2020-06-09 | Ultralow temperature aluminum electrolytic capacitor and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111653431A true CN111653431A (en) | 2020-09-11 |
| CN111653431B CN111653431B (en) | 2023-01-17 |
Family
ID=72348839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010519034.7A Active CN111653431B (en) | 2020-06-09 | 2020-06-09 | Ultralow temperature aluminum electrolytic capacitor and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111653431B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112768248A (en) * | 2021-01-06 | 2021-05-07 | 广州金立电子有限公司 | Low-temperature-resistant electrolyte for aluminum electrolytic capacitor |
| CN113539687A (en) * | 2020-10-13 | 2021-10-22 | 南通一品机械电子有限公司 | Method for reducing impedance and loss of conductive polymer solid aluminum electrolytic capacitor |
| CN114005679A (en) * | 2021-12-16 | 2022-02-01 | 肇庆绿宝石电子科技股份有限公司 | Aluminum electrolytic capacitor for gallium nitride charger and preparation method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507966A (en) * | 1995-03-22 | 1996-04-16 | Boundary Technologies, Inc. | Electrolyte for an electrolytic capacitor |
| US20040240148A1 (en) * | 2003-05-30 | 2004-12-02 | Viste Mark Edward | Low freezing electrolyte for an electrolytic capacitor |
| CN1707710A (en) * | 2005-04-11 | 2005-12-14 | 万裕三信电子(东莞)有限公司 | Aluminium electrolytic capacitor and electrolyte |
| CN1862728A (en) * | 2005-12-28 | 2006-11-15 | 横店集团东磁有限公司 | Flash lamp aluminum electrolytic capacitor and preparation method thereof |
| CN101114544A (en) * | 2006-07-29 | 2008-01-30 | 广西师范大学 | Working electrolyte for wide temperature high voltage aluminium electrolytic capacitor and method for making same thereof |
| CN102324327A (en) * | 2011-05-31 | 2012-01-18 | 肇庆绿宝石电子有限公司 | Method for preventing short-circuit failure of high-voltage aluminum-electrolyzing capacitor for switching power supply |
| CN104471661A (en) * | 2012-07-31 | 2015-03-25 | 日本贵弥功株式会社 | Solid electrolytic capacitor and method for manufacturing same |
| CN106098381A (en) * | 2016-08-29 | 2016-11-09 | 益阳华晟鑫电子有限公司 | A kind of manufacturing process of novel anti-kilovolt thunderbolt aluminium electrolutic capacitor |
| 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 |
-
2020
- 2020-06-09 CN CN202010519034.7A patent/CN111653431B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507966A (en) * | 1995-03-22 | 1996-04-16 | Boundary Technologies, Inc. | Electrolyte for an electrolytic capacitor |
| US20040240148A1 (en) * | 2003-05-30 | 2004-12-02 | Viste Mark Edward | Low freezing electrolyte for an electrolytic capacitor |
| CN1707710A (en) * | 2005-04-11 | 2005-12-14 | 万裕三信电子(东莞)有限公司 | Aluminium electrolytic capacitor and electrolyte |
| CN1862728A (en) * | 2005-12-28 | 2006-11-15 | 横店集团东磁有限公司 | Flash lamp aluminum electrolytic capacitor and preparation method thereof |
| CN101114544A (en) * | 2006-07-29 | 2008-01-30 | 广西师范大学 | Working electrolyte for wide temperature high voltage aluminium electrolytic capacitor and method for making same thereof |
| CN102324327A (en) * | 2011-05-31 | 2012-01-18 | 肇庆绿宝石电子有限公司 | Method for preventing short-circuit failure of high-voltage aluminum-electrolyzing capacitor for switching power supply |
| CN104471661A (en) * | 2012-07-31 | 2015-03-25 | 日本贵弥功株式会社 | Solid electrolytic capacitor and method for manufacturing same |
| CN106098381A (en) * | 2016-08-29 | 2016-11-09 | 益阳华晟鑫电子有限公司 | A kind of manufacturing process of novel anti-kilovolt thunderbolt aluminium electrolutic capacitor |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 黄远彬等: "铝电解电容器耐低温、高频低阻抗技术的研究", 《电子质量》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539687A (en) * | 2020-10-13 | 2021-10-22 | 南通一品机械电子有限公司 | Method for reducing impedance and loss of conductive polymer solid aluminum electrolytic capacitor |
| CN113539687B (en) * | 2020-10-13 | 2022-10-04 | 南通一品机械电子有限公司 | Method for reducing impedance and loss of conductive polymer solid aluminum electrolytic capacitor |
| CN112768248A (en) * | 2021-01-06 | 2021-05-07 | 广州金立电子有限公司 | Low-temperature-resistant electrolyte for aluminum electrolytic capacitor |
| CN112768248B (en) * | 2021-01-06 | 2022-05-31 | 广州金立电子有限公司 | Low-temperature-resistant electrolyte for aluminum electrolytic capacitor |
| CN114005679A (en) * | 2021-12-16 | 2022-02-01 | 肇庆绿宝石电子科技股份有限公司 | Aluminum electrolytic capacitor for gallium nitride charger and preparation method thereof |
| CN114005679B (en) * | 2021-12-16 | 2023-03-24 | 肇庆绿宝石电子科技股份有限公司 | Aluminum electrolytic capacitor for gallium nitride charger and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111653431B (en) | 2023-01-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111653431B (en) | Ultralow temperature aluminum electrolytic capacitor and manufacturing method thereof | |
| CN109192509B (en) | 600V high-voltage high-temperature-resistant long-life aluminum electrolytic capacitor and manufacturing method thereof | |
| CN101916671B (en) | Preparation method of solid electrolytic capacitor capable of reducing ESR and enhancing electrostatic capacitance | |
| CN114678223B (en) | Treatment process of formation aluminum foil of low-leakage-current laminated capacitor and laminated capacitor | |
| CN111029153B (en) | Electrolyte for ultralow-temperature aluminum electrolytic capacitor and preparation method thereof | |
| CN112837939B (en) | High-temperature-resistant high-voltage electrolyte and aluminum electrolytic capacitor using same | |
| CN111640578A (en) | Working electrolyte of aluminum electrolytic capacitor for LED and preparation method thereof | |
| CN112582180A (en) | Electrolyte for high-hydration-resistance medium-high voltage aluminum electrolytic capacitor and preparation method | |
| CN107039183A (en) | Semi-solid preparation high-pressure aluminum electrolytic capacitor working electrolyte | |
| CN109448993B (en) | Electrolyte of aluminum electrolytic capacitor and preparation method thereof | |
| CN112582181B (en) | Electrolyte for low-voltage aluminum electrolytic capacitor with high hydration resistance and preparation method | |
| CN113327770B (en) | Working electrolyte of low-voltage electrolytic capacitor for high-temperature working and preparation method thereof | |
| KR970004299B1 (en) | Electrolyte for condenser | |
| CN113539687A (en) | Method for reducing impedance and loss of conductive polymer solid aluminum electrolytic capacitor | |
| CN110993351A (en) | High-capacity aluminum electrolytic capacitor and preparation method thereof | |
| CN102176379B (en) | Ternary mixed solvent with high boiling point and low freezing point and application thereof | |
| CN113889343B (en) | Preparation method of high-energy solid aluminum electrolytic capacitor | |
| CN117476368B (en) | Aluminum electrolytic capacitor with high stability and long service life | |
| CN114068189B (en) | Chip type aluminum electrolytic capacitor and preparation method thereof | |
| CN116564714B (en) | Ultralow-temperature medium-high-voltage lead type aluminum electrolytic capacitor | |
| CN112951607B (en) | Solid-liquid mixed aluminum electrolyte and preparation method thereof | |
| CN114255998A (en) | Aluminum electrolytic capacitor anode foil and aluminum electrolytic capacitor | |
| CN116364437A (en) | Working electrolyte for medium-high voltage aluminum electrolytic capacitor and preparation method thereof | |
| JPH0810663B2 (en) | Electrolytic solution for electrolytic capacitors | |
| CN114267543A (en) | Wide-temperature-range aluminum electrolytic capacitor and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |