CN112435856A - Aluminum electrolytic capacitor and manufacturing method and application thereof - Google Patents
Aluminum electrolytic capacitor and manufacturing method and application thereof Download PDFInfo
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- CN112435856A CN112435856A CN202011224051.4A CN202011224051A CN112435856A CN 112435856 A CN112435856 A CN 112435856A CN 202011224051 A CN202011224051 A CN 202011224051A CN 112435856 A CN112435856 A CN 112435856A
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- electrolytic capacitor
- aluminum electrolytic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
Abstract
The invention discloses an aluminum electrolytic capacitor and a manufacturing method and application thereof. A method for manufacturing an aluminum electrolytic capacitor, comprising the steps of: (1) winding a core package: an electrolytic paper is inserted between the anode foil and the cathode foil and wound into a core package, wherein the cathode foil is an aluminum foil with a metal titanium coating film formed on the surface; (2) impregnation: immersing the wound core package into electrolyte for impregnation treatment; wherein the water content of the electrolyte is less than or equal to 40%, and the conductivity is more than or equal to 34 mS/cm; (3) and (3) packaging: sealing the impregnated core bag into the shell and the rubber plug; (4) and (5) an aging step. The invention selects the specific electrolyte and the specific cathode foil which are cooperated to meet the requirement of ultralow temperature of-55 ℃ and achieve the characteristic of ultralow impedance.
Description
Technical Field
The invention relates to the technical field of capacitor manufacturing, in particular to an aluminum electrolytic capacitor and a manufacturing method and application 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.
Along with the demand of market development, the place where the outdoor power supply is applied is not fixed, the environmental temperature of each area is also greatly different, the electrolytic capacitor is sensitive to the temperature, and the capacity is reduced and even damaged due to the over-low environmental temperature. Many systems adopt resistance-capacitance reset circuits mostly for simplifying the system and reducing the cost, and when the capacitance is too low because of the temperature, the capacitance of the capacitance is too low, resulting in the reset pulse signal retention time being too short, and then the system is reset abnormally, causing the system unstable. In addition, the capacitance has another function of power supply filtering, and the reduction of the capacitance necessarily causes the reduction of the performance of the originally designed filtering. For some circuits that are sensitive to power supply ripple, this necessarily results in a reduction in reliability.
In the prior art, a conventional low-voltage high-conductivity and high-water-content electrolyte is matched with a common non-chemical negative foil. The existing liquid low-voltage electrolytic capacitor has high water content of electrolyte, is easy to solidify in a low-temperature environment, and has obviously reduced conductivity and sharply increased impedance. The traditional solution is to adopt low water content electrolyte to meet the low temperature condition, but the impedance characteristic is general or poor; the electrolyte with high conductivity is adopted to meet the condition of low impedance, but the low-temperature characteristic is general or poor, and the low-temperature requirement of-55 ℃ can not be met, and the characteristic requirement of low impedance can also be met.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides an aluminum electrolytic capacitor and a manufacturing method and application thereof. The invention selects the specific electrolyte and the specific cathode foil which are cooperated to meet the requirement of ultralow temperature of-55 ℃ and achieve the characteristic of ultralow impedance.
The technical problem to be solved by the invention is realized by the following technical scheme:
in one aspect, a method for manufacturing an aluminum electrolytic capacitor includes the steps of:
(1) winding a core package: an electrolytic paper is inserted between the anode foil and the cathode foil and wound into a core package, wherein the cathode foil is an aluminum foil with a metal titanium coating film formed on the surface;
(2) impregnation: immersing the wound core package into electrolyte for impregnation treatment; wherein the water content of the electrolyte is less than or equal to 40%, and the conductivity is more than or equal to 34 mS/cm;
(3) and (3) packaging: sealing the impregnated core bag into the shell and the rubber plug;
(4) and (5) an aging step.
In a preferred embodiment of the method for manufacturing an aluminum electrolytic capacitor according to the present invention, the thickness of the metallic titanium coating is 0.5 to 1.5 μm.
In a preferred embodiment of the method for manufacturing an aluminum electrolytic capacitor according to the present invention, the thickness of the metallic titanium film is 1 μm.
The aluminum foil having a titanium metal film formed on the surface thereof is formed with a titanium metal plating layer having a thickness of micrometers on both surfaces of the aluminum foil by a vapor deposition method such as magnetron sputtering or electrodeposition.
As a preferred embodiment of the method for manufacturing the aluminum electrolytic capacitor provided by the invention, the electrolyte comprises the following components in parts by weight: 25-30 parts of ethylene glycol, 18-20 parts of adipic acid ammonium, 10-12 parts of a hydration inhibitor, 8-10 parts of ammonium formate, 1-1.5 parts of p-nitrobenzylamine, 0.5-1 part of ammonia water, 18-20 parts of deionized water, 5-8 parts of N-ethylformamide, 0.5-1.5 parts of phosphoric acid, 1-3 parts of ammonium dihydrogen phosphate, 1-2 parts of mannitol and 0.5-1 part of triethylamine.
As a preferred embodiment of the method for manufacturing the aluminum electrolytic capacitor provided by the invention, the electrolyte comprises the following components in parts by weight: 28 parts of ethylene glycol, 18 parts of adipic acid ammonium, 12 parts of hydration inhibitor, 8 parts of ammonium formate, 1 part of p-nitrobenzylamine, 0.5 part of ammonia water, 20 parts of deionized water, 8 parts of N-ethylformamide, 1 part of phosphoric acid, 2 parts of ammonium dihydrogen phosphate, 1 part of mannitol and 1 part of triethylamine.
On the other hand, an aluminum electrolytic capacitor is manufactured by the method for manufacturing the aluminum electrolytic capacitor.
In another aspect, the aluminum electrolytic capacitor is applied to an outdoor power supply.
As a preferred embodiment of the application of the aluminum electrolytic capacitor provided by the present invention in an outdoor power supply, the outdoor power supply includes an LED, an energy saving lamp, a ballast, a driving power supply or a switching power supply.
The invention has the following beneficial effects:
the invention selects the specific electrolyte and the specific cathode foil which are cooperated to meet the requirement of ultralow temperature of-55 ℃ and achieve the characteristic of ultralow impedance. The aluminum electrolytic capacitor manufactured by the invention is qualified in the capacity ratio and the impedance ratio of-55 ℃. Meanwhile, compared with the conventional aluminum electrolytic capacitor with the conventional aluminum cathode foil matched with the conventional electrolyte, the capacity of the aluminum electrolytic capacitor is obviously improved by about 13 percent (the improvement rate is up to about 20 percent) compared with the capacity ratio matched with the conventional electrolyte at the temperature of-55 ℃, the impedance ratio of the aluminum electrolytic capacitor is reduced by 2.27 (the amplitude reduction rate is up to about 47 percent) compared with the impedance ratio matched with the conventional electrolyte, and the ESR of the aluminum electrolytic capacitor is 3.04 omega (the amplitude reduction rate is up to about 68 percent) smaller than that matched with the conventional electrolyte, so that the aluminum electrolytic capacitor has better characteristics. The invention has obvious advantages under the low temperature condition of-55 ℃ after specific matching, can better ensure the quality of products and meet the use of customers.
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 illustration, the specification of the aluminum electrolytic capacitor of each comparative example of the following examples is 1500 UF/35V, and the size is 10 x 35mm2The number of 300 capacitors produced is for illustrative purposes only and is not meant to be a limitation of the present invention.
Example 1
The embodiment provides a manufacturing method of an 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 cathode foil is an aluminum foil with a metal titanium coating film formed on the surface, and the thickness of the metal titanium coating film is 1 mu m.
(2) Impregnation: and immersing the wound core package into electrolyte for impregnation treatment. Wherein the content of the first and second substances,
the electrolyte comprises the following components in parts by weight: 28 parts of ethylene glycol, 18 parts of adipic acid ammonium, 12 parts of hydration inhibitor, 8 parts of ammonium formate, 1 part of p-nitrobenzylamine, 0.5 part of ammonia water, 20 parts of deionized water, 8 parts of N-ethylformamide, 1 part of phosphoric acid, 2 parts of ammonium dihydrogen phosphate, 1 part of mannitol and 1 part of triethylamine.
(3) And (3) packaging: and (4) putting the impregnated core bag into the shell and sealing the rubber plug.
(4) And (5) an aging step.
Example 2
The embodiment provides a manufacturing method of an 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 cathode foil is an aluminum foil with a metal titanium coating formed on the surface, and the thickness of the metal titanium coating is 0.5 μm.
(2) Impregnation: and immersing the wound core package into electrolyte for impregnation treatment. Wherein the content of the first and second substances,
the electrolyte comprises the following components in parts by weight: 25 parts of ethylene glycol, 20 parts of ammonium adipate, 11 parts of hydration inhibitor, 9 parts of ammonium formate, 1.5 parts of p-nitrobenzylamine, 1 part of ammonia water, 18 parts of deionized water, 5 parts of N-ethylformamide, 1.5 parts of phosphoric acid, 1 part of ammonium dihydrogen phosphate, 2 parts of mannitol and 1 part of triethylamine.
(3) And (3) packaging: and (4) putting the impregnated core bag into the shell and sealing the rubber plug.
(4) And (5) an aging step.
Example 3
The embodiment provides a manufacturing method of an 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 cathode foil is an aluminum foil with a metal titanium coating formed on the surface, and the thickness of the metal titanium coating is 1.5 mu m.
(2) Impregnation: and immersing the wound core package into electrolyte for impregnation treatment. Wherein the content of the first and second substances,
the electrolyte comprises the following components in parts by weight: 30 parts of ethylene glycol, 18 parts of adipic acid ammonium, 10 parts of hydration inhibitor, 10 parts of ammonium formate, 1.2 parts of p-nitrobenzylamine, 0.8 part of ammonia water, 20 parts of deionized water, 8 parts of N-ethylformamide, 0.5 part of phosphoric acid, 3 parts of ammonium dihydrogen phosphate, 1 part of mannitol and 1 part of triethylamine.
(3) And (3) packaging: and (4) putting the impregnated core bag into the shell and sealing the rubber plug.
(4) And (5) an aging step.
Comparative example 1
This comparative example differs from example 1 in that: the cathode foil is a conventional aluminum foil (the aluminum foil is a conventional aluminum foil with the pressure resistance of 2.5V and the thickness of 50 mu m); the electrolyte is a conventional electrolyte (the electrolyte has a conductivity of about 30mS/cm and a water content of about 50%).
Comparative example 2
This comparative example differs from example 1 in that: the cathode foil is a conventional aluminum foil (the aluminum foil is a conventional aluminum foil with the pressure resistance of 2.5V and the thickness of 50 μm).
Comparative example 3
This comparative example differs from example 1 in that: the electrolyte is a conventional electrolyte (the electrolyte has a conductivity of about 30mS/cm and a water content of about 50%).
The high and low temperature characteristics of each of 10 capacitors of example 1 and comparative examples 1 to 3 were tested by holding at 20 ℃ or-55 ℃ for 2 hours, and then measuring the capacity CAP, ESR, impedance (Z), and rate of change of capacity at low temperature (ratio X/X +20 of capacity at 55 degrees to capacity at 20 degrees).
| Example 1 | Example 1 | Comparative example 1 | Comparative example 1 | Comparative example 2 | Comparative example 2 | Comparative example 3 | Comparative example 3 | |
| Temperature of | 20℃ | -55℃ | 20℃ | -55℃ | 20℃ | -55℃ | 20℃ | -55℃ |
| CAP | 1430 | 1088 | 1412 | 890.3 | 1422 | 979.2 | 1419 | 965.4 |
| CAP(X/X+20) | / | 76% | / | 63% | / | 69% | / | 68% |
| ESR（Ω） | 0.028 | 1.455 | 0.037 | 4.495 | 0.033 | 3.87 | 0.035 | 4.022 |
| Impedance ratio (X/X +20) | / | 2.51 | / | 4.78 | / | 3.92 | / | 4.31 |
The above data are the average of 10 test data each.
As shown in the table, the aluminum electrolytic capacitor manufactured by the invention is qualified in the capacity ratio and the impedance ratio of-55 ℃. Under the condition of 55 ℃, the capacity of the aluminum electrolytic capacitor of the example 1 is obviously improved by about 13 percent compared with the capacity of the comparative example 1 (the improvement rate is about 20 percent), the impedance of the aluminum electrolytic capacitor of the example 1 is reduced by 2.27 percent compared with the impedance of the comparative example 1 (the reduction rate is about 47 percent), the ESR of the aluminum electrolytic capacitor of the example 1 is 3.04 omega smaller than that of the aluminum electrolytic capacitor of the comparative example 1 (the reduction rate is about 68 percent), and the characteristics are all better.
The capacity of the aluminum electrolytic capacitor in the embodiment 1 of the invention is obviously improved by about 7 percent (the improvement rate is about 10.14 percent) compared with the capacity of the comparative example 2, the impedance of the aluminum electrolytic capacitor in the embodiment 1 of the invention is reduced by 1.41 (the reduction rate is about 35.97 percent) compared with the impedance of the comparative example 2, the ESR of the aluminum electrolytic capacitor in the embodiment 1 of the invention is 2.415 omega (the reduction rate is about 62.4 percent) smaller than that of the comparative example 2, and the characteristics are all better.
The capacity of the aluminum electrolytic capacitor in the example 1 of the invention is obviously improved by about 8 percent compared with the capacity of the comparative example 3 (the improvement rate is about 11.76 percent), the impedance of the aluminum electrolytic capacitor in the example 1 of the invention is reduced by 1.8 percent compared with the impedance of the comparative example 3 (the reduction rate is about 41.76 percent), the ESR of the aluminum electrolytic capacitor in the example 1 of the invention is smaller than the ESR of the comparative example 3 by 2.567 omega (the reduction rate is about 63.82 percent), and the characteristics are all better.
It can be seen that when only the electrolyte or only the negative foil is optimized, the resulting aluminum electrolytic capacitor has low electrostatic capacity, high ESR and high impedance at-55 ℃, and it is proved that the best technical effect can be obtained only by simultaneously adopting the treatment and/or process parameters. 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. Therefore, the invention selects the specific electrolyte and the specific cathode foil, and the specific electrolyte and the specific cathode foil are cooperated to meet the requirement of ultralow temperature of-55 ℃ and achieve the characteristic of ultralow impedance. Under the low temperature condition of-55 ℃, the aluminum electrolytic capacitor has obvious advantages, can better ensure the quality of products and meet the use of customers.
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 (8)
1. A method for manufacturing an aluminum electrolytic capacitor, characterized in that it comprises the following steps
Winding a core package: an electrolytic paper is inserted between the anode foil and the cathode foil and wound into a core package, wherein the cathode foil is an aluminum foil with a metal titanium coating film formed on the surface;
impregnation: immersing the wound core package into electrolyte for impregnation treatment; wherein the water content of the electrolyte is less than or equal to 40%, and the conductivity is more than or equal to 34 mS/cm;
and (3) packaging: sealing the impregnated core bag into the shell and the rubber plug;
and (5) an aging step.
2. The method for manufacturing an aluminum electrolytic capacitor as recited in claim 1, wherein the thickness of the metallic titanium coating is 0.5 to 1.5 μm.
3. The method for manufacturing an aluminum electrolytic capacitor as recited in claim 1, wherein the metallic titanium skin has a thickness of 1 μm.
4. The method for manufacturing the aluminum electrolytic capacitor according to claim 1, wherein the electrolyte comprises the following components in parts by weight: 25-30 parts of ethylene glycol, 18-20 parts of adipic acid ammonium, 10-12 parts of a hydration inhibitor, 8-10 parts of ammonium formate, 1-1.5 parts of p-nitrobenzylamine, 0.5-1 part of ammonia water, 18-20 parts of deionized water, 5-8 parts of N-ethylformamide, 0.5-1.5 parts of phosphoric acid, 1-3 parts of ammonium dihydrogen phosphate, 1-2 parts of mannitol and 0.5-1 part of triethylamine.
5. The method for manufacturing the aluminum electrolytic capacitor according to claim 1, wherein the electrolyte comprises the following components in parts by weight: 28 parts of ethylene glycol, 18 parts of adipic acid ammonium, 12 parts of hydration inhibitor, 8 parts of ammonium formate, 1 part of p-nitrobenzylamine, 0.5 part of ammonia water, 20 parts of deionized water, 8 parts of N-ethylformamide, 1 part of phosphoric acid, 2 parts of ammonium dihydrogen phosphate, 1 part of mannitol and 1 part of triethylamine.
6. An aluminum electrolytic capacitor produced by the method for producing an aluminum electrolytic capacitor according to any one of claims 1 to 5.
7. Use of the aluminum electrolytic capacitor of claim 6 in outdoor power supplies.
8. The use of the aluminum electrolytic capacitor of claim 7 in outdoor power supplies, wherein the outdoor power supplies comprise LEDs, energy saving lamps, ballasts, driving power supplies or switching power supplies.
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| CN202011224051.4A CN112435856A (en) | 2020-11-05 | 2020-11-05 | Aluminum electrolytic capacitor and manufacturing method and application thereof |
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| CN202011224051.4A CN112435856A (en) | 2020-11-05 | 2020-11-05 | Aluminum electrolytic capacitor and manufacturing method and application thereof |
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Citations (7)
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| CN1277728A (en) * | 1998-12-03 | 2000-12-20 | 如碧空株式会社 | Electrolytic capacitor |
| CN1708817A (en) * | 2002-10-31 | 2005-12-14 | 三菱化学株式会社 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
| CN1711614A (en) * | 2002-11-08 | 2005-12-21 | 日本贵弥功株式会社 | Electrolytic capacitor |
| CN101093751A (en) * | 2006-11-17 | 2007-12-26 | 深圳清华大学研究院 | Method for preparing foil of cathode with high specific volume |
| CN101425379A (en) * | 2008-07-29 | 2009-05-06 | 东莞市东阳光电容器有限公司 | Cathode foil producing process for electrolytic capacitor |
| CN107785171A (en) * | 2016-08-30 | 2018-03-09 | 江苏泗阳欣宏电子科技有限公司 | A kind of aluminum electrolytic capacitor electrolyte of boron-doping acid glycerine polyester and preparation method thereof |
| CN108292566A (en) * | 2015-11-27 | 2018-07-17 | 松下知识产权经营株式会社 | electrolytic capacitor and its manufacturing method |
-
2020
- 2020-11-05 CN CN202011224051.4A patent/CN112435856A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1277728A (en) * | 1998-12-03 | 2000-12-20 | 如碧空株式会社 | Electrolytic capacitor |
| CN1708817A (en) * | 2002-10-31 | 2005-12-14 | 三菱化学株式会社 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
| CN1711614A (en) * | 2002-11-08 | 2005-12-21 | 日本贵弥功株式会社 | Electrolytic capacitor |
| CN101093751A (en) * | 2006-11-17 | 2007-12-26 | 深圳清华大学研究院 | Method for preparing foil of cathode with high specific volume |
| CN101425379A (en) * | 2008-07-29 | 2009-05-06 | 东莞市东阳光电容器有限公司 | Cathode foil producing process for electrolytic capacitor |
| CN108292566A (en) * | 2015-11-27 | 2018-07-17 | 松下知识产权经营株式会社 | electrolytic capacitor and its manufacturing method |
| CN107785171A (en) * | 2016-08-30 | 2018-03-09 | 江苏泗阳欣宏电子科技有限公司 | A kind of aluminum electrolytic capacitor electrolyte of boron-doping acid glycerine polyester and preparation method thereof |
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