CN110706928B - Guide pin type aluminum electrolytic capacitor and production method thereof - Google Patents
Guide pin type aluminum electrolytic capacitor and production method thereof Download PDFInfo
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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
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- 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
- H01G9/04—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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Abstract
The invention relates to a guide pin type aluminum electrolytic capacitor, which belongs to the technical field of capacitors and comprises a shell with an opening and a packaging layer positioned at the opening of the shell, wherein a core package is arranged in the shell and comprises an anode aluminum foil, a cathode aluminum foil, inner-layer electrolytic paper and outer-layer electrolytic paper, the core package is soaked with electrolyte, the inner-layer electrolytic paper and the outer-layer electrolytic paper are respectively positioned at the same side of the cathode aluminum foil and the anode aluminum foil, and the inner-layer electrolytic paper comprises 40-55 parts by weight of aramid fiber, 20-30 parts by weight of cotton fiber and 15-28 parts by weight of sisal fiber, and the outer-layer electrolytic paper comprises 35-45 parts by weight of wood pulp fiber, 20-28 parts by weight of manila fiber and 18-25 parts by weight of sisal fiber; the invention also relates to a production method of the guide pin type aluminum electrolytic capacitor, which comprises the following steps: s1: cutting; s2: nailing and winding; s3: preparing an electrolyte; s4 dipping; s5: assembling and aging; the invention has the effect of improving the high-voltage alternating current impact resistance of the aluminum electrolytic capacitor.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a guide pin type aluminum electrolytic capacitor and a production method thereof.
Background
The capacitor is one of electronic components widely used in electronic devices, and is widely applied to coupling, bypassing, filtering, tuning loop, energy conversion, control and the like in a circuit.
At present, electronic products become an indispensable important part of modern life, and various types of electronic products and electronic equipment are widely applied to aspects of production and life of people. But the instability of the power grid can cause the bottom-bulging phenomenon of the product. The alternating current voltage of the 400V aluminum electrolytic capacitor on the market is about 380V, if electronic products suffer from high-voltage alternating current impact, the high-voltage alternating current impact easily causes the overvoltage of the aluminum electrolytic capacitor during long-time use, so that the aluminum electrolytic capacitor is broken down, the power supply is partially failed, the normal use of the electronic products is affected, local circuit combustion can be caused even in serious conditions, and the property and life of people are threatened.
Therefore, the safety against high voltage alternating current is a problem that needs to be considered in electronic products, and it is necessary to improve the high voltage alternating current impact resistance of the aluminum electrolytic capacitor.
Disclosure of Invention
The invention aims to provide a guide pin type aluminum electrolytic capacitor, which improves the high-voltage alternating current impact resistance of the aluminum electrolytic capacitor.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a guide pin type aluminium electrolytic capacitor, is provided with the core package including having open-ended casing and the encapsulated layer that is located the casing opening part in the casing, and the core package includes positive pole aluminium foil, negative pole aluminium foil, inlayer electrolytic paper and outer electrolytic paper, and the core package is soaked there is electrolyte, inlayer electrolytic paper and outer electrolytic paper are located negative pole aluminium foil and positive pole aluminium foil same one side respectively, negative pole aluminium foil, inlayer electrolytic paper, positive pole aluminium foil, outer electrolytic paper set gradually, according to the weight parts, inlayer electrolytic paper includes aramid fiber 40-55 parts, cotton fiber 20-30 parts, sisal fiber 15-28 parts, and outer electrolytic paper includes wood pulp fiber 35-45 parts, manila fiber 20-28 parts, sisal fiber 18-25 parts.
By adopting the technical scheme, the electrolytic paper is one of the key materials for forming the aluminum electrolytic capacitor, and the electrolytic paper is used as an adsorption carrier of the electrolyte, plays a role in isolating the anode aluminum foil and the cathode aluminum foil, and also forms the cathode of the aluminum electrolytic capacitor together with the electrolyte. Differences in electrolytic paper will result in differences in capacitor performance.
The inner layer of the electrolytic paper is made of aramid fiber, cotton fiber and sisal fiber. First, aramid fibers, which are used in combination with sisal fibers, have excellent electrical properties and tensile strength, but relatively poor liquid absorption properties. In order to obtain the inner-layer electrolytic paper material with good liquid absorption, the cotton fiber is added, so that the cotton fiber has good absorption, excellent temperature characteristic, wide working temperature range and slightly low tensile strength. The aramid fiber, the sisal fiber and the cotton fiber are used in a matching way, so that the inner-layer electrolytic paper with excellent tensile strength and absorptivity can be obtained, the electrolyte on the surfaces of the cathode aluminum foil and the anode aluminum foil is sufficient, and the requirement of smaller ESR is met.
The outer layer of electrolytic paper is selected from wood pulp fiber, manila fiber and sisal fiber. The wood pulp fiber has the advantages of high density, voltage resistance and aluminum foil burr resistance, but the wood pulp fiber has poor water absorption and larger ESR; the manila fiber has good water absorption, stable high-temperature performance and high tensile strength; the sisal fiber is shorter than the manila fiber, has low tensile strength, high purity, excellent electrical performance and moderate price, and the outer layer electrolytic paper with better performance can be obtained by mixing the wood pulp fiber, the manila fiber and the sisal fiber for use and strictly controlling the proportion.
The inner layer electrolytic paper and the outer layer electrolytic paper are respectively made of different fibers, the inner layer electrolytic paper has excellent water absorption, and simultaneously, the tensile strength and the voltage resistance can meet corresponding requirements; the outer layer electrolytic paper has excellent voltage resistance and good water absorption; the arrangement of the inner and outer layers of electrolytic paper and the selection of materials enable the electrolyte on the surfaces of the cathode aluminum foil and the anode aluminum foil to be sufficient, so that the aluminum electrolytic capacitor has strong high-voltage alternating current impact resistance.
The invention is further configured to: the beating degree of the inner layer electrolytic paper is 20-38 DEG SR.
By adopting the technical scheme, the control of the beating degree has great influence on the performance of the final paper, the beating degree is too high, the liquid absorption of the inner layer electrolytic paper is poor, the beating degree is too low, and the paper strength is too low; the inner layer electrolytic paper with good comprehensive performance can be obtained by strictly controlling the beating degree.
The invention is further configured to: the thickness of the inner layer electrolytic paper is 30-45 μm.
By adopting the technical scheme, the thickness of the inner-layer electrolyte paper is consistent with the beating degree, and the water absorption and the paper strength of the electrolyte paper are affected to a certain degree when the thickness is too thin or too thick, so that the inner-layer electrolyte paper with better water absorption and strength can be obtained by strictly controlling the paper thickness of the inner-layer electrolyte.
The invention is further configured to: the beating degree of the outer layer electrolytic paper is 60-85 DEG SR.
By adopting the technical scheme, compared with the inner layer electrolytic paper, the beating degree of the outer layer electrolytic paper is slightly higher, so that the outer layer electrolytic paper with higher strength can be obtained.
The invention is further configured to: the thickness of the outer layer electrolytic paper is 40-50 μm.
By adopting the technical scheme, compared with the inner layer electrolytic paper, the outer layer electrolytic paper has thicker thickness, so that the paper strength of the outer layer electrolyte can be further increased, and the voltage resistance of the outer layer electrolyte is enhanced.
The invention is further configured to: according to parts by weight, the electrolyte comprises 20-25 parts of diethylene glycol, 10-18 parts of polyglycerol ether, 15-26 parts of ethylene carbonate, 20-28 parts of ammonium pelargonate, 3-5 parts of citric acid and 3-5 parts of tartaric acid.
The invention also aims to provide a production method of the guide pin type aluminum electrolytic capacitor, which comprises the following steps:
s1: cutting: cutting the cathode aluminum foil, the anode aluminum foil and the electrolytic paper;
s2: nailing and winding: the positive electrode guide pin penetrates through the packaging layer to be in nail connection with the anode aluminum foil, and the negative electrode guide pin penetrates through the packaging layer to be in nail connection with the cathode aluminum foil; sequentially laying a cathode aluminum foil, an inner layer electrolytic paper, an anode aluminum foil and an outer layer electrolytic paper from bottom to top, and winding the anode aluminum foil, the cathode aluminum foil and the electrolytic paper into a core package;
s3: dipping: immersing the core bag into electrolyte for 50-70min to ensure that the electrolyte is fully immersed on the electrolytic paper;
s4: assembling and aging: and assembling the impregnated core package, the shell and the packaging layer into a capacitor, and aging.
By adopting the technical scheme, according to the production method provided by the invention, the inner layer of electrolytic paper and the outer layer of electrolyte are paved and then wound into a core package together with the cathode aluminum foil and the anode aluminum foil during nail winding, and the core package is immersed in the electrolyte, so that the aluminum electrolytic capacitor with high-voltage alternating current impact resistance can be obtained.
The invention is further configured to: in step S4, the core bag is immersed in the electrolyte for 20-35 min; vacuumizing the core bag to perform vacuum impregnation for 5-10min, wherein the vacuum degree is-75 KPa to-85 KPa; then introducing compressed air into the core bag until the pressure is 3-5atm, and carrying out pressurized impregnation for 10-20 min.
By adopting the technical scheme, after normal pressure impregnation, vacuum impregnation is carried out, and finally pressure impregnation is carried out, so that the electrolyte between the anode aluminum foil and the cathode aluminum foil is more sufficient, and the impregnation effect of the electrolyte is enhanced.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the inner layer of the electrolytic paper is made of aramid fiber, cotton fiber and sisal fiber; the outer layer of electrolytic paper is selected from wood pulp fiber, manila fiber and sisal fiber; the arrangement and the material selection of the inner layer electrolytic paper and the outer layer electrolytic paper ensure that the electrolyte on the surfaces of the cathode aluminum foil and the anode aluminum foil is sufficient, so that the aluminum electrolytic capacitor has stronger high-voltage alternating current impact resistance;
2. after normal pressure impregnation, vacuum impregnation is carried out, and finally pressure impregnation is carried out, so that the electrolyte between the anode aluminum foil and the cathode aluminum foil is more sufficient, and the impregnation effect of the electrolyte is enhanced.
Detailed Description
Example 1
A method for producing a guide pin type aluminum electrolytic capacitor comprises the following steps:
s1: cutting: cutting the cathode aluminum foil, the anode aluminum foil and the electrolytic paper; the inner-layer electrolytic paper comprises 40 parts of aramid fiber, 20 parts of cotton fiber and 15 parts of sisal fiber, and the outer-layer electrolytic paper comprises 35 parts of wood pulp fiber, 20 parts of manila fiber and 18 parts of sisal fiber.
S2: nailing and winding: the positive electrode guide pin penetrates through the packaging layer to be in nail connection with the anode aluminum foil, and the negative electrode guide pin penetrates through the packaging layer to be in nail connection with the cathode aluminum foil; sequentially laying a cathode aluminum foil, an inner layer electrolytic paper, an anode aluminum foil and an outer layer electrolytic paper from bottom to top, and winding the anode aluminum foil, the cathode aluminum foil and the electrolytic paper into a core package;
s3: preparing an electrolyte: uniformly mixing 20 parts of diethylene glycol, 10 parts of polyglycerol ether and 15 parts of ethylene carbonate, heating to 50 ℃, adding 20 parts of ammonium pelargonate, and uniformly stirring to obtain a mixed solution A; heating the mixed solution A to 100 ℃, preserving the heat for 45min, adding 3 parts of tartaric acid and 3 parts of citric acid, stirring uniformly, and cooling to room temperature;
s4 dipping: immersing the core bag into electrolyte for 50min to fully immerse the electrolyte on the electrolytic paper;
s5: assembling and aging: and assembling the impregnated core package, the shell and the packaging layer into a capacitor, and aging.
Example 2
A method for producing a guide pin type aluminum electrolytic capacitor comprises the following steps:
s1: cutting: cutting the cathode aluminum foil, the anode aluminum foil and the electrolytic paper; the inner-layer electrolytic paper comprises 48 parts of aramid fiber, 25 parts of cotton fiber and 22 parts of sisal fiber, and the outer-layer electrolytic paper comprises 38 parts of wood pulp fiber, 25 parts of manila fiber and 22 parts of sisal fiber.
S2: nailing and winding: the positive electrode guide pin penetrates through the packaging layer to be in nail connection with the anode aluminum foil, and the negative electrode guide pin penetrates through the packaging layer to be in nail connection with the cathode aluminum foil; sequentially laying a cathode aluminum foil, an inner layer electrolytic paper, an anode aluminum foil and an outer layer electrolytic paper from bottom to top, and winding the anode aluminum foil, the cathode aluminum foil and the electrolytic paper into a core package;
s3: preparing an electrolyte: uniformly mixing 23 parts of diethylene glycol, 25 parts of polyglycerol ether and 20 parts of ethylene carbonate, heating to 50 ℃, adding 24 parts of ammonium pelargonate, and uniformly stirring to obtain a mixed solution A; heating the mixed solution A to 100 ℃, preserving the heat for 45min, adding 4 parts of tartaric acid and 4 parts of citric acid, stirring uniformly, and cooling to room temperature;
s4 dipping: immersing the core bag into electrolyte for 60min to fully immerse the electrolyte on the electrolytic paper;
s5: assembling and aging: and assembling the impregnated core package, the shell and the packaging layer into a capacitor, and aging.
Example 3
A method for producing a guide pin type aluminum electrolytic capacitor comprises the following steps:
s1: cutting: cutting the cathode aluminum foil, the anode aluminum foil and the electrolytic paper; the inner-layer electrolytic paper comprises 55 parts of aramid fiber, 30 parts of cotton fiber and 28 parts of sisal fiber, and the outer-layer electrolytic paper comprises 45 parts of wood pulp fiber, 28 parts of manila fiber and 25 parts of sisal fiber.
S2: nailing and winding: the positive electrode guide pin penetrates through the packaging layer to be in nail connection with the anode aluminum foil, and the negative electrode guide pin penetrates through the packaging layer to be in nail connection with the cathode aluminum foil; sequentially laying a cathode aluminum foil, an inner layer electrolytic paper, an anode aluminum foil and an outer layer electrolytic paper from bottom to top, and winding the anode aluminum foil, the cathode aluminum foil and the electrolytic paper into a core package;
s3: preparing an electrolyte: uniformly mixing 25 parts of diethylene glycol, 18 parts of polyglycerol ether and 26 parts of ethylene carbonate, heating to 50 ℃, adding 28 parts of ammonium pelargonate, and uniformly stirring to obtain a mixed solution A; heating the mixed solution A to 100 ℃, preserving the heat for 45min, adding 5 parts of tartaric acid and 5 parts of citric acid, stirring uniformly, and cooling to room temperature;
s4 dipping: immersing the core bag into electrolyte for 70min to ensure that the electrolyte is fully immersed on the electrolytic paper;
s5: assembling and aging: and assembling the impregnated core package, the shell and the packaging layer into a capacitor, and aging.
Example 4
A method for producing a lead-pin type aluminum electrolytic capacitor, which is different from example 2 in that: in step S1, the inner layer electrolyte paper has a beating degree of 20 DEG SR and a thickness of 30 μm.
Example 5
A method for producing a lead-pin type aluminum electrolytic capacitor, which is different from example 2 in that: in step S1, the inner layer electrolyte paper has a beating degree of 38 DEG SR and a thickness of 45 μm.
Example 6
A method for producing a lead-pin type aluminum electrolytic capacitor, which is different from example 2 in that: in step S1, the inner layer electrolyte paper has a beating degree of 28 DEG SR and a thickness of 37 μm.
Example 7
A method for producing a lead-pin type aluminum electrolytic capacitor, which is different from example 2 in that: in step S1, the outer layer of electrolytic paper has a beating degree of 60 DEG SR and a thickness of 40 μm.
Example 8
A method for producing a lead-pin type aluminum electrolytic capacitor, which is different from example 2 in that: in step S1, the outer layer of electrolytic paper has a beating degree of 85 DEG SR and a thickness of 50 μm.
Example 9
A method for producing a lead-pin type aluminum electrolytic capacitor, which is different from example 2 in that: in step S1, the outer layer of electrolytic paper has a beating degree of 70 DEG SR and a thickness of 45 μm.
Comparative example 1
The difference from example 2 is that: the inner-layer electrolytic paper comprises 48 parts of aramid fiber, 25 parts of cotton fiber and 22 parts of sisal fiber in parts by weight.
Comparative example 2
The difference from example 2 is that: the outer layer of the electrolytic paper comprises 38 parts of wood pulp fiber, 25 parts of manila fiber and 22 parts of sisal fiber in parts by weight.
Performance detection
The liquid absorption height test is carried out according to the national standard GB/T461.1-2002, the air permeability test is carried out according to the national standard GB/T458-.
TABLE 1 results of Performance test of examples 1 to 9 and comparative examples 1 to 2
In addition, the capacitors of examples 1 to 9 and comparative examples 1 to 2 were applied with an AC voltage of 410V for 30min at 105 ℃ and the results after application were examined and shown in Table 2.
TABLE 2 results of AC resistance test of examples 1 to 9 and comparative examples 1 to 2
As can be seen from Table 1, the examples 1-9 all have excellent properties and breakdown voltage of more than 440V, while in comparative example 1, the liquid absorption height and air permeability are better and the electrical breakdown strength, tensile strength and breakdown voltage are poorer in comparative example 1 because the outer layer electrolytic paper and the inner layer electrolytic paper are made of the same raw materials and mixture ratio; similarly, the liquid absorption height and air permeability of comparative example 2 were poor because the inner and outer electrolytic papers of comparative example 2 were made of the same raw materials in the same proportions.
As can be seen from Table 2, the capacitors prepared by the invention have excellent high-voltage AC resistance, while the capacitors prepared by the invention have no bottom-bulging phenomenon after resisting the 410V AC voltage for 30min in the examples 1-9, but the capacitors prepared by the comparative examples 1-2 have the bottom-bulging phenomenon, and the bottom-bulging phenomenon of the comparative example 1 is more serious.
In conclusion, the inner layer of the electrolytic paper is made of aramid fibers, cotton fibers and sisal fibers; the outer layer of electrolytic paper is selected from wood pulp fiber, manila fiber and sisal fiber; the arrangement of the inner and outer layers of electrolytic paper and the selection of materials enable the electrolyte on the surfaces of the cathode aluminum foil and the anode aluminum foil to be sufficient, so that the aluminum electrolytic capacitor has strong high-voltage alternating current impact resistance.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The utility model provides a guide pin type aluminium electrolytic capacitor, is provided with the core package including having open-ended casing and the encapsulated layer that is located the casing opening part in the casing, and the core package includes positive pole aluminium foil, negative pole aluminium foil, inlayer electrolytic paper and outer electrolytic paper, and the core package has soaked electrolyte, its characterized in that: the inner layer electrolytic paper and the outer layer electrolytic paper are respectively positioned on the same side of the cathode aluminum foil and the anode aluminum foil, the cathode aluminum foil, the inner layer electrolytic paper, the anode aluminum foil and the outer layer electrolytic paper are sequentially arranged, the inner layer electrolytic paper comprises 40-55 parts by weight of aramid fiber, 20-30 parts by weight of cotton fiber and 15-28 parts by weight of sisal fiber, and the outer layer electrolytic paper comprises 35-45 parts by weight of wood pulp fiber, 20-28 parts by weight of manila fiber and 18-25 parts by weight of sisal fiber.
2. A lead type aluminum electrolytic capacitor as set forth in claim 1, wherein: the beating degree of the inner layer electrolytic paper is 20-38 DEG SR.
3. A lead type aluminum electrolytic capacitor as set forth in claim 2, wherein: the thickness of the inner layer electrolytic paper is 30-45 μm.
4. A lead type aluminum electrolytic capacitor as set forth in claim 1, wherein: the beating degree of the outer layer electrolytic paper is 60-85 DEG SR.
5. A needle-guiding type aluminum electrolytic capacitor as set forth in claim 3, characterized in that: the thickness of the outer layer electrolytic paper is 40-50 μm.
6. A lead type aluminum electrolytic capacitor as set forth in claim 1, wherein: according to parts by weight, the electrolyte comprises 20-25 parts of diethylene glycol, 10-18 parts of polyglycerol ether, 15-26 parts of ethylene carbonate, 20-28 parts of ammonium pelargonate, 3-5 parts of citric acid and 3-5 parts of tartaric acid.
7. The method for producing a lead type aluminum electrolytic capacitor as recited in any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1: cutting: cutting the cathode aluminum foil, the anode aluminum foil and the electrolytic paper;
s2: nailing and winding: the positive electrode guide pin penetrates through the packaging layer to be in nail connection with the anode aluminum foil, and the negative electrode guide pin penetrates through the packaging layer to be in nail connection with the cathode aluminum foil; sequentially laying a cathode aluminum foil, an inner layer electrolytic paper, an anode aluminum foil and an outer layer electrolytic paper from bottom to top, and winding the anode aluminum foil, the cathode aluminum foil and the electrolytic paper into a core package;
s3: preparing an electrolyte: uniformly mixing diethylene glycol, polyglycerol ether and ethylene carbonate, heating to 50-70 ℃, adding ammonium pelargonate, and uniformly stirring to obtain a mixed solution A; heating the mixed solution A to 110 ℃ at 100 ℃, preserving the heat for 45-75min, adding tartaric acid and citric acid, stirring uniformly, and cooling to room temperature;
s4 dipping: immersing the core bag into electrolyte for 50-70min to ensure that the electrolyte is fully immersed on the electrolytic paper;
s5: assembling and aging: and assembling the impregnated core package, the shell and the packaging layer into a capacitor, and aging.
8. The method for producing a lead type aluminum electrolytic capacitor as claimed in claim 7, wherein: in step S4, the core bag is immersed in the electrolyte for 20-35 min; vacuumizing the core bag to perform vacuum impregnation for 5-10min, wherein the vacuum degree is-75 KPa to-85 KPa; then introducing compressed air into the core bag until the pressure is 3-5atm, and carrying out pressurized impregnation for 10-20 min.
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| CN113789681B (en) * | 2021-09-18 | 2023-03-21 | 重庆大学 | Method for treating aramid fiber doped modified cellulose insulation paper by using plasma |
| CN113914142B (en) * | 2021-09-30 | 2023-02-28 | 浙江鹏辰造纸研究所有限公司 | Hydrophilic diaphragm paper for zinc-silver battery and preparation method thereof |
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| JP2000106327A (en) * | 1998-09-28 | 2000-04-11 | Asahi Glass Co Ltd | Electric double layer capacitor |
| WO2003065480A1 (en) * | 2002-01-29 | 2003-08-07 | Newturn Energy Co., Ltd. | Fibroid separator and energy storage device using the same |
| CN101667494A (en) * | 2009-10-12 | 2010-03-10 | 上海永铭电子有限公司 | Method for preparing aluminum electrolytic capacitor with ultra-small volume specially used for energy-saving lamp |
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