CN112837939B - High-temperature-resistant high-voltage electrolyte and aluminum electrolytic capacitor using same - Google Patents
High-temperature-resistant high-voltage electrolyte and aluminum electrolytic capacitor using same Download PDFInfo
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 55
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 29
- 239000003990 capacitor Substances 0.000 title claims abstract description 23
- 239000002904 solvent Substances 0.000 claims abstract description 21
- -1 carboxylic acid ammonium salt Chemical class 0.000 claims abstract description 20
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920001971 elastomer Polymers 0.000 claims abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 8
- 239000001257 hydrogen Substances 0.000 claims abstract description 8
- QCDWFXQBSFUVSP-UHFFFAOYSA-N 2-phenoxyethanol Chemical compound OCCOC1=CC=CC=C1 QCDWFXQBSFUVSP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003381 stabilizer Substances 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 125000003118 aryl group Chemical group 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 5
- ARKIFHPFTHVKDT-UHFFFAOYSA-N 1-(3-nitrophenyl)ethanone Chemical compound CC(=O)C1=CC=CC([N+]([O-])=O)=C1 ARKIFHPFTHVKDT-UHFFFAOYSA-N 0.000 claims description 4
- BNMJSBUIDQYHIN-UHFFFAOYSA-N butyl dihydrogen phosphate Chemical compound CCCCOP(O)(O)=O BNMJSBUIDQYHIN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- CFBYEGUGFPZCNF-UHFFFAOYSA-N 2-nitroanisole Chemical compound COC1=CC=CC=C1[N+]([O-])=O CFBYEGUGFPZCNF-UHFFFAOYSA-N 0.000 claims description 3
- JKTYGPATCNUWKN-UHFFFAOYSA-N 4-nitrobenzyl alcohol Chemical compound OCC1=CC=C([N+]([O-])=O)C=C1 JKTYGPATCNUWKN-UHFFFAOYSA-N 0.000 claims description 3
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 3
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 3
- 229930195725 Mannitol Natural products 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229920001131 Pulp (paper) Polymers 0.000 claims description 3
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 3
- GJYJYFHBOBUTBY-UHFFFAOYSA-N alpha-camphorene Chemical compound CC(C)=CCCC(=C)C1CCC(CCC=C(C)C)=CC1 GJYJYFHBOBUTBY-UHFFFAOYSA-N 0.000 claims description 3
- FFPQSNUAVYJZDH-UHFFFAOYSA-N diazanium;terephthalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 FFPQSNUAVYJZDH-UHFFFAOYSA-N 0.000 claims description 3
- ZJXZSIYSNXKHEA-UHFFFAOYSA-L ethyl phosphate(2-) Chemical compound CCOP([O-])([O-])=O ZJXZSIYSNXKHEA-UHFFFAOYSA-L 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000594 mannitol Substances 0.000 claims description 3
- 235000010355 mannitol Nutrition 0.000 claims description 3
- 239000005543 nano-size silicon particle Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000600 sorbitol Substances 0.000 claims description 3
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 3
- OTLNPYWUJOZPPA-UHFFFAOYSA-N 4-nitrobenzoic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1 OTLNPYWUJOZPPA-UHFFFAOYSA-N 0.000 claims description 2
- YMTFKPVAKZUDPQ-UHFFFAOYSA-N C(CCCCCCC(=O)[O-])(=O)[O-].CC(CC)[NH3+].CC(CC)[NH3+] Chemical compound C(CCCCCCC(=O)[O-])(=O)[O-].CC(CC)[NH3+].CC(CC)[NH3+] YMTFKPVAKZUDPQ-UHFFFAOYSA-N 0.000 claims description 2
- 229940067597 azelate Drugs 0.000 claims description 2
- 239000004305 biphenyl Substances 0.000 claims description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 claims description 2
- 229940116351 sebacate Drugs 0.000 claims description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims 1
- 239000004327 boric acid Substances 0.000 claims 1
- 150000002978 peroxides Chemical class 0.000 claims 1
- 238000009835 boiling Methods 0.000 abstract description 5
- 229920006395 saturated elastomer Polymers 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 230000032050 esterification Effects 0.000 abstract description 4
- 238000005886 esterification reaction Methods 0.000 abstract description 4
- 230000009435 amidation Effects 0.000 abstract description 3
- 238000007112 amidation reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000006096 absorbing agent Substances 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 239000003960 organic solvent Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000003335 steric effect Effects 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- WXKSXVWSGPWLIA-UHFFFAOYSA-N azane 2-methylnonanedioic acid Chemical compound N.OC(=O)C(C)CCCCCCC(O)=O WXKSXVWSGPWLIA-UHFFFAOYSA-N 0.000 description 2
- 235000010356 sorbitol Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- JYFHYPJRHGVZDY-UHFFFAOYSA-N Dibutyl phosphate Chemical compound CCCCOP(O)(=O)OCCCC JYFHYPJRHGVZDY-UHFFFAOYSA-N 0.000 description 1
- 239000000010 aprotic solvent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- SPZBYSKKSSLUKN-UHFFFAOYSA-N diazanium;2-butyloctanedioate Chemical compound [NH4+].[NH4+].CCCCC(C([O-])=O)CCCCCC([O-])=O SPZBYSKKSSLUKN-UHFFFAOYSA-N 0.000 description 1
- 125000001142 dicarboxylic acid group Chemical group 0.000 description 1
- 229940014772 dimethyl sebacate Drugs 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/145—Liquid electrolytic capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
A high-temperature resistant high-voltage electrolyte and an aluminum electrolytic capacitor using the same comprise electrolyte, a core group immersed in the electrolyte, an aluminum shell for sealing and a rubber plug. The electrolyte consists of two solvents, namely gamma-butyrolactone and ethylene glycol phenyl ether. The electrolyte solute mainly comprises an organic carboxylic acid ammonium salt with an alpha-position side branch, and the additive comprises a sparking voltage improver, an oxidation film stabilizer, a hydrogen absorber and the like. The beneficial effects of the invention are as follows: the main solvent and the auxiliary solvent are both high boiling point organic solvents, and the ratio of 7: when the proportion of 3 is matched, the azeotropic point is higher, the saturated steam pressure is reduced, and the electrolyte prepared by dissolving the ammonium carboxylate salt with the steric effect formed by alpha side branched chain is not easy to generate degradation reactions such as esterification, amidation and the like in a high-temperature working environment.
Description
Technical Field
The invention belongs to the technical field of capacitors, and particularly relates to a high-temperature-resistant aluminum electrolytic capacitor.
Background
The traditional aluminum electrolytic capacitor is generally applied to a working environment of-25 to +105 ℃, and is inapplicable because degradation reactions such as esterification, amidation and the like are easy to occur when the traditional aluminum electrolytic capacitor is used at a higher ambient temperature because of insufficient heat resistance of electrolyte, and the performance is greatly reduced. However, in the transfer switch circuit and the high-power lighting electronic circuit of the electric automobile which are rapidly developed recently, the aluminum electrolytic capacitor is required to have the capability of high voltage resistance (400-450V) and ultra-high temperature resistance of 150 ℃, and the current aluminum electrolytic capacitor is difficult to meet the requirement. In order to improve the withstand voltage of the electrolyte, it is a common technique to reduce the solute concentration and increase the viscosity of the electrolyte, which brings about the disadvantages of accelerating the volatility of the electrolyte in a long-term high-temperature environment, reducing the formation ability of the electrolyte, promoting the decomposition of the dicarboxylic acid structure, and the like. To overcome this disadvantage, improvements to existing electrolytes are needed.
Disclosure of Invention
The invention provides an electrolytic capacitor, which comprises electrolyte, a core group immersed in the electrolyte, and an aluminum shell and a rubber plug for assembling the electrolyte and the core group.
The sparking voltage of the electrolyte is greater than 480V, the electrolyte comprises a main solvent, an auxiliary solvent and a solute, wherein the main solvent accounts for 50-75% of the total weight of the electrolyte, the auxiliary solvent accounts for 5-15% of the total weight of the electrolyte, and the solute accounts for 4-10% of the total weight of the electrolyte. Preferably, the ratio of the main solvent to the auxiliary solvent is 7:3, a step of;
the main solvent is gamma-butyrolactone;
the auxiliary solvent is ethylene glycol phenyl ether;
the solute is mainly alkyl carboxylic acid ammonium salt with one or more branched chains at alpha position; the alkyl carboxylic acid ammonium salt is selected from one or more of 2, 15-dimethyl-hexadecyl ammonium diacid, 2, 17-dimethyl-5-hydroxy-octadecyl ammonium diacid, 2-methyl ammonium azelate, poly (ammonium terephthalate), 2-butyl ammonium suberate, 5, 6-dimethyl ammonium sebacate, 2, 9-diphenyl ammonium sebacate and 1, 7-ammonium suberate;
The core group comprises an anode, a cathode and electrolytic paper for spacing the anode and the cathode, the aluminum purity of the anode foil is more than 99.99 percent, the aluminum purity of the cathode foil is more than 99.4 percent, and the electrolytic paper is one or more of wood pulp fiber, D fiber, fibrilia and bast fiber.
The aluminum shell is formed by aluminum with the purity of 98.5%;
the rubber plug is high-temperature-resistant peroxide-vulcanized hydrogenated nitrile rubber.
Preferably, the electrolyte further includes a phosphorus-containing compound for stabilizing an oxide film, an aromatic hydrogen-absorbing compound, and the like for a sparking voltage improver.
Preferably, the sparking voltage improver for improving the sparking voltage is one or more of polyethylene glycol, polyvinyl alcohol, borated polyethylene glycol, polyacrylamide, polyoxyethylene glycol, polyoxypropylene triol, nano silicon dioxide, mannitol and sorbitol, and the sparking voltage improver accounts for 2-10% relative to the total weight of the electrolyte.
Preferably, the oxide film stabilizing phosphide is selected from one or two of butyl phosphate, monobutyl phosphate, monoethyl phosphate and ammonium hypophosphite, and the oxide film stabilizer accounts for 0.3-2% of the total weight of the electrolyte.
Preferably, the aromatic hydrogen absorption compound is one or two of o-nitroanisole, m-nitroacetophenone, p-nitrobenzyl alcohol and p-nitrobenzoic acid. The aromatic hydrogen absorption additive accounts for 0.5 to 3 percent relative to the total weight of the electrolyte.
The working voltage of the capacitor is 400-450V.
Preferably, the rubber plug is made of high-temperature-resistant peroxide-vulcanized hydrogenated nitrile rubber.
The beneficial effects of the invention are as follows: the main solvent and the auxiliary solvent are both high boiling point organic solvents, and the ratio of 7:3, the azeotropic point is higher when the proportion is matched, the saturated steam pressure is reduced, the electrolyte prepared by dissolving the ammonium carboxylate salt with the steric effect formed by alpha side branched chain is not easy to generate degradation reactions such as esterification, amidation and the like in a high-temperature working environment, the matching tightness is 0.6-0.9 g/cm 3, the thickness is 40-70 mu m, and the capacitor is made of electrolytic paper and a special butyl rubber plug, the working voltage is 400-450V, and the capacitor can work stably for a long time in an ultra-high temperature environment at 150 ℃.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear and obvious, the invention is further explained below by combining with the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the electrolyte of the invention, gamma-butyrolactone is adopted as a main solvent, mainly considering that the boiling point is high, and the gamma-butyrolactone is an aprotic solvent, so that the gamma-butyrolactone is not easy to generate esterification degradation reaction with ammonium carboxylate salt in a high-temperature environment, and the stability of high-temperature operation can be maintained. However, the solubility is low, the saturated steam pressure is high, and the use alone is not suitable for the ultra-high temperature environment. Thus, ethylene glycol phenyl ether with the same high boiling point and low saturated steam pressure is adopted as an auxiliary solvent. Through a plurality of experiments, the ratio of the two is found to be 7: about 3, preferably, if the ratio of gamma-butyrolactone is high as in example 2, the solubility is poor and the saturated vapor pressure is high; if the proportion of ethylene glycol phenyl ether is high, the azeotropic point is lowered and the low-temperature property is also deteriorated.
In the electrolyte of the present invention, one or more of 2, 15-dimethyl-hexadecyl ammonium diacid, 2, 17-dimethyl-5-hydroxy-octadecanedioic acid ammonium, 2-methylazelaic acid ammonium, poly (ammonium terephthalate), 2-butylsuberate ammonium, 5, 6-dimethyl sebacate ammonium, 2, 9-diphenyl sebacate ammonium, 1, 7-suberate ammonium may be added, and 2, 17-dimethyl-5-hydroxy-octadecanedioic acid ammonium and 2-methylazelaic acid ammonium are preferably added because of the side branch at the α -position, and deterioration reaction at high temperature can be suppressed, and the high temperature resistance effect is particularly good. The addition of small amounts of ammonium polyterephthalate can also act to increase the sparking voltage.
In the electrolyte of the invention, one or more of polyethylene glycol, polyvinyl alcohol, borated polyethylene glycol, polyacrylamide, polyoxyethylene glycol, polyoxypropylene triol, nano silicon dioxide, mannitol and sorbitol can be added as an electrolyte sparking voltage improver, the addition amount is preferably 2-10%, the addition amount is small, the sparking inhibiting effect is poor, and the risk of sparking failure is caused under the high-temperature condition. The addition amount is large, and the viscosity of the electrolyte increases, which lowers the conductivity of the electrolyte.
To the electrolyte of the present invention, one or two of butyl phosphate, monobutyl phosphate, monoethyl phosphate, and ammonium hypophosphite may be added as a phosphorus compound for the positive electrode oxide film stabilizer. Preferably, the monobutyl phosphate and the dibutyl phosphate are added in a mixed mode, the addition amount is preferably 0.5-1.5%, the addition amount is small, and the stabilizing effect on the oxide film is poor; excessive addition has a negative effect on the decrease of sparking voltage.
In the electrolyte, one or two of o-nitroanisole, m-nitroacetophenone, p-nitrobenzyl alcohol and p-nitrobenzoic acid aromatic compounds can be added as the application of the electrolyte hydrogen absorber, preferably m-nitroacetophenone is added, the hydrogen absorbing effect is good, and the addition amount can reach 2 percent.
The conductivity of the electrolyte is 1.3-1.7 ms/cm, and the sparking voltage is above 480V.
The rubber plug for sealing the capacitor is hydrogenated nitrile rubber vulcanized by dicumyl peroxide with high temperature resistance.
The invention is further illustrated by the following specific examples.
TABLE 1
As can be seen from the table, the electrolyte provided by the invention has higher boiling point, higher conductivity and sparking voltage, and is especially suitable for high-voltage ultrahigh-temperature capacitors.
In order to simulate the change of the electrolyte in the ultra-high temperature environment of the capacitor, the electrolyte is put into a closed stainless steel cylinder and placed in the environment of 150 ℃ for 1000 hours, the conductivity and weight change of the electrolyte are measured, the data are summarized in the following table,
TABLE 2
As can be seen from the data in the above table, the electrolyte of the present invention is placed at 150 ℃ for a long time, and the rate of change of each parameter is far superior to that of the conventional electrolyte. In order to further verify the high temperature and high pressure resistant effect of the electrolyte, the electrolyte is prepared into an aluminum electrolytic capacitor together with a core group, a hydrogenated nitrile rubber plug and an aluminum shell, wherein the core group is formed by winding positive and negative aluminum foils and electrolytic paper. Specifically, a cathode foil of 680VF 0.36 mu F/cm 2 is adopted, a negative foil with the purity of 99.7% is pressurized, an electrolytic paper with the composite thickness of wood pulp fiber and cotton-flax fiber of 60 mu m is wound into a core group, the electrolytic solution is impregnated, an aluminum shell and a rubber plug are assembled, each prepared 20PCS400V15 mu F phi 12.5 multiplied by 25 aluminum electrolytic capacitor is verified to have high temperature performance, and the result of a high Wen Wenbo load test (RC: 105 mA/only) is recorded in the following table,
TABLE 3 Table 3
It can be seen from the combination of tables 1 and 2 that the aluminum electrolytic capacitor provided by the invention works stably in an ultra-high temperature environment at 150 ℃, and has better high temperature resistance even if the parameter change rate is smaller after long-time load test.
It should be noted that the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention, but any modification, equivalent replacement or improvement made under the concept and principles of the present invention should be included in the scope of the present invention.
Claims (4)
1. A high-temperature resistant aluminum electrolytic capacitor comprises electrolyte and a core group immersed in the electrolyte, and is characterized in that,
The electrolyte comprises a main solvent, an auxiliary solvent and a solute, wherein the main solvent accounts for 55.3-56.8% of the total weight of the electrolyte, the auxiliary solvent accounts for 23-24% of the total weight of the electrolyte, and the solute accounts for 8-10% of the total weight of the electrolyte;
the main solvent is gamma-butyrolactone;
the auxiliary solvent is ethylene glycol phenyl ether;
the solute is alkyl carboxylic acid ammonium salt with one or more branched chains at alpha position;
The alkyl carboxylic acid ammonium salt is selected from more than one of 2, 15-dimethyl-hexadecyl ammonium diacid, 2, 17-dimethyl-5-hydroxy-octadecyl ammonium diacid, 2-methyl ammonium azelate, poly (ammonium terephthalate), 2-butyl ammonium suberate, 5, 6-dimethyl ammonium sebacate, 2, 9-diphenyl ammonium sebacate or 1, 7-ammonium suberate;
The electrolyte also comprises a sparking voltage improver, a phosphorus-containing compound for stabilizing an oxide film and an aromatic hydrogen absorption compound; the sparking voltage improver accounts for 2-10%, the oxide film stabilizer accounts for 0.3-2% of the total weight of the electrolyte, and the aromatic hydrogen absorption compound accounts for 0.5-3% of the total weight of the electrolyte;
The sparking voltage improver is selected from more than one of nano silicon dioxide, polyethylene glycol, polyvinyl alcohol, boric acid esterified polyethylene glycol, polyacrylamide, polyoxyethylene glycol, polyoxypropylene triol, mannitol and sorbitol;
the phosphorus-containing compound for the oxide film stabilizer is selected from more than one of butyl phosphate, monobutyl phosphate, monoethyl phosphate and ammonium hypophosphite;
the aromatic hydrogen absorption compound is one or more of o-nitroanisole, m-nitroacetophenone, p-nitrobenzyl alcohol and p-nitrobenzoic acid.
2. The high temperature resistant aluminum electrolytic capacitor as recited in claim 1, wherein the anode foil in the core group has an aluminum purity of 99.99% or more and the cathode foil has an aluminum purity of 99.4% or more, and the electrolytic paper for separating the anode from the anode is one or more of wood pulp fiber and fibrilia.
3. The high temperature resistant aluminum electrolytic capacitor of claim 1 further comprising an aluminum shell and a rubber plug for assembling the electrolyte and the core assembly.
4. The high temperature resistant aluminum electrolytic capacitor of claim 3 wherein said aluminum shell is 98.5% pure aluminum and said rubber plug is high temperature resistant peroxide cured hydrogenated nitrile rubber.
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| CN115116751B (en) * | 2022-07-19 | 2023-03-21 | 深圳市新中元电子有限公司 | Aluminum electrolytic capacitor electrolyte, preparation method thereof and aluminum electrolytic capacitor |
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| CN105280385B (en) * | 2014-06-11 | 2019-05-21 | 东莞市东阳光电容器有限公司 | A kind of slender type high-pressure aluminum electrolytic capacitor Working electrolyte |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005100956A (en) * | 2003-09-05 | 2005-04-14 | Ube Ind Ltd | Dopant agent, conductive polymer material containing the dopant agent, and solid electrolytic capacitor using the polymer material |
| CN106910634A (en) * | 2016-09-14 | 2017-06-30 | 深圳市中元吉康电子有限公司 | The high pressure super-low impedance aluminium electrolutic capacitor of EMI excellents |
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