KR20060038043A - Method for manufacturing a aluminum condenser - Google Patents

Abstract

The method for manufacturing an aluminum wound solid electrolytic capacitor according to the present invention comprises the steps of: forming at a rated voltage to recover a chemical conversion film of the cathode electrode foil 10 subjected to the high temperature treatment of the winding element; Between the positive electrode foil and the negative electrode foil was inserted an insulating paper 30 made of low density manilaji winding the positive electrode electrode 10, the negative electrode foil 20 and the insulating paper wound together at a temperature of 250 ℃ Heat-treating for 3 hours to reduce the density of the insulating paper; The low-density device was deposited in ferric toluene sulfonic acid, an oxidizing agent solution, and mixed and deposited monomer 3-ethylene dioxythiophene and 4-ethylene dioxythiophene in a ratio of 1: 3 with methanol. Drying at 75 ° C. for 3 hours to form a conductive polymer polymerization layer; The polymerized device was immersed in an aqueous solution of acetonitrile (acetonitrile: pure water = 8: 2) for 5 minutes, and then dried for 10 minutes at a temperature range of 80 ° C. to contain some moisture in the device. ; Storing and assembling the polymerized element into a sealing member and a case; It characterized in that it comprises the step of aging the assembled capacitor. When the humidification process is performed before assembly, the present invention improves the LC characteristic variation of the product by slightly compensating the film recoverability of the solid electrolyte with a small amount of moisture, and provides a conductive polymer to the wound type device inherent in the aluminum solid capacitor. As a capacitor used as an electrolyte, short-circuit of the product is not only reduced, but also excellent in impedance and equivalent series resistance (ESR) characteristics at high frequencies (100 to 300 kHz).

Description

Manufacturing method of aluminum wound solid electrolytic capacitor {Method for manufacturing a aluminum condenser}

1 is a view schematically showing the structure of an aluminum wound solid electrolytic capacitor according to the present invention.

<Brief description of symbols for the main parts of the drawings>

10: anode electrode foil 20: cathode electrode foil

30: insulating paper 40: lead

50: roll paper tape

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aluminum wound solid electrolytic capacitor. More specifically, the present invention relates to a winding type device inherent in an aluminum solid capacitor. The present invention relates to a method for producing an aluminum wound solid electrolytic capacitor having excellent equivalent series resistance (ESR) characteristics.

In general, an aluminum solid electrolytic capacitor has a function of accumulating energy (charge) when a direct current voltage is applied through a dielectric between two opposite electrode plates using aluminum as an electrode. The aluminum solid capacitor is manufactured using an aluminum thin film, and an aluminum electrolytic capacitor is manufactured through an etching process, a chemical conversion process, a cutting process, a winding process, an impregnation process, an assembly process, and a regeneration process. That is, an insulating film is inserted between the positive electrode foil (+) and the negative electrode foil (-) constituting the aluminum solid capacitor and inserted into a can constituting the aluminum solid capacitor. After the anode foil, the insulating film, and the cathode foil are inserted into the can of the aluminum solid capacitor, the electrolyte is injected into the can. The electrolyte is a liquid made by forming various chemicals and serves as a substantial cathode.

Recently, with the digitization and high frequency of electronic devices, aluminum solid capacitors are required to have low resistance in the high frequency region with a small capacity. However, conventional electrolytes include liquid electrolytes in which quaternary salts are dissolved in a solvent such as ethylene glycol (EG) or gamma butyl lactose (GBL), and solid electrolyte solutions such as manganese dioxide or tetracyanoquinomimethane (TCNQ). It is difficult to cope at high frequency because the liquid electrolyte solution is high, and manganese dioxide, which is a solid electrolyte, is formed by thermal decomposition of manganese nitrate, but the conductivity of manganese dioxide is low, and a capacitor using tetracyanoquinomimethane (TCNQ) as an electrolyte. Tetracyanoquinomethane (TCNQ) has a disadvantage in that it is difficult to cope with characteristics at high frequencies because of its low heat resistance.

The present invention has been made to solve the above problems, and an object of the present invention is to use the conductive polymer as an electrolyte in a wound device inherent in an aluminum solid capacitor to improve the characteristics of impedance and equivalent series resistance (ESR) at high frequencies. An object of the present invention is to provide a method for manufacturing an aluminum wound solid electrolytic capacitor which can be greatly improved.

A method of manufacturing an aluminum wound solid electrolytic capacitor according to the present invention for achieving the above object, comprising the steps of: forming at a rated voltage to recover a chemical conversion film of a high-temperature treated cathode electrode foil of a winding element; Between the positive electrode foil and the negative electrode foil, an insulating paper made of low density manila paper was inserted, and the winding element wound together with the positive electrode foil, the negative electrode foil, and the insulating paper was heat treated at a temperature of 250 ° C. for 3 hours to reduce the density of the insulating paper. Making a step; The low-density device was deposited in ferric toluene sulfonic acid, an oxidizing agent solution, and mixed and deposited monomer 3-ethylene dioxythiophene and 4-ethylene dioxythiophene in a ratio of 1: 3 with methanol. Drying at 75 ° C. for 3 hours to form a conductive polymer polymerization layer; The polymerized device was immersed in an aqueous solution of acetonitrile (acetonitrile: pure water = 8: 2) for 5 minutes, and then dried for 10 minutes at a temperature range of 80 ° C. to contain some moisture in the device. ; Storing and assembling the polymerized element into a sealing member and a case; It characterized in that it comprises the step of aging the assembled capacitor.

Hereinafter, the present invention will be described in detail.

1 is a view schematically showing the structure of an aluminum wound solid electrolyte capacitor according to the present invention.                     

According to the present invention, low density manila paper is used as the insulating paper between the aluminum positive electrode foil and the negative electrode foil constituting the aluminum solid electrolytic capacitor, and the positive electrode foil, the insulating paper and the negative electrode foil are wound together. In the step of forming a conductive polymer electrolyte layer by impregnating 3-ethylene dioxythiophene, 4-ethylene dioxythiophene and an oxidizing agent solution in the winding device formed by winding the positive electrode foil, insulating paper and negative electrode foil together In this regard, the process sequence for the polymerization reaction to the surface of the oxide film and the inside of the etching groove of the capacitor to form a dense polyethylene dioxythiophene conductive polymer layer is as follows.

Referring to Figure 1 describes the manufacturing method of the aluminum wound solid electrolytic capacitor, first, the electrolyte used in the aluminum solid capacitor should be able to implement the characteristics of the aluminum solid capacitor well, the aluminum solid capacitor can withstand the rated voltage well. Aluminum solid capacitors must use an electrolyte that has high spark voltage, low resistivity, and can be used in a wide temperature range.

Therefore, a monomer (monomer) is sequentially added to the element wound together with the lead 40 using a low density manila as the insulating paper 30 between the aluminum anode electrode foil 10 and the cathode electrode foil 20. Impregnated with 3-ethylenedioxythiophene and 4-ethylenedioxythiophene, and then immersed in a mixed solution of oxidizing agent and solvent and dried at a high temperature at a constant temperature. A polymerization reaction occurs to the inside to form a dense polyethylene dioxythiophene conductive polymer layer.                     

Ferric paratoluenesulfonic acid was diluted by 30 to 50% in a butanol solvent as the oxidant solution. The mixing ratio of monomer and oxidant solution was selected in the range of 1:10 to 1:20, and the solvent was methanol, One of the monohydric alcohols such as ethanol, butanol and propanol is selected, and the mixing ratio with the oxidizing agent is 1: 0.5 to 1: 1.

In the polymerizing polymerization process of the present invention, the wound device is first converted into chemicals, washed with pure water, heat treated at a high temperature of 200 to 280 ° C for 10 minutes to 3 hours to lower the density of the insulating paper, and to reduce the density of the device. After immersion in the oxidizing agent solution, the monomer, that is, the monomer is immersed in a solution in which the monomer (monomer) such as methanol, ethanol, butanol and the like is mixed in a ratio of 1: 1 to 1: 5 (weight ratio). The oxidant deposition drying is carried out for 1 to 3 hours in the temperature range of room temperature to 100 ° C, and the monomer solution deposition drying is carried out for 1 to 5 hours at a temperature of 30 minutes to 3 hours and 50 to 120 ° C at room temperature. It performs over and forms a dense polymer layer.

The above-described polymerized device was immersed in an aqueous solution of acetonitrile (acetonitrile ratio: 3 to 9%) within a time range of 1 to 20 minutes, and then 5 to 30 minutes at a temperature in a temperature range of room temperature to 100 ° C. The process of drying in the range and containing some moisture in an element was added. Thereafter, it was housed in a sealing material and a case, assembled, and then aged.

When the humidification process is performed before assembling as described above, the film recoverability of the solid electrolyte is somewhat compensated with a small amount of water to improve the LC characteristic deviation of the product.

Table 1

Product Specifications CAP TAN (%) LC (㎂) Z (㏁) ESR (㏁) Conventional example 328 2.4 45 (12-68; severe deviation) 17 15 Example 329 2.3 28 (9 to 42; improved deviation) 16 14

Table 1 shows the product configuration and application examples of the capacitor, and the application conditions are 16V / 330㎌: 10ψ × 13ι. Average of 10 products. The number in parentheses among the LC characteristics is the distribution of 10 products.

In the above-described conventional example, mixed and deposited 3-ethylenedioxythiophene and 4-ethylenedioxythiophene as monomers in a ratio of 1: 3 in a step of forming a monomer layer and drying at 75 ° C. for 3 hours. Test results according to the above example, and the above example is a test result obtained by adding a humidification process, that is, immersing for 5 minutes in an aqueous solution of acetonitrile (acetonitrile: pure water = 8: 2) and drying at 80 ° C for 10 minutes.

As can be seen from the above description, the present invention uses manila paper as an insulating paper between the positive electrode foil and the negative electrode foil constituting the aluminum solid electrolytic capacitor, and winds the positive electrode foil, the insulating paper and the negative electrode foil together. . The winding device formed by winding the positive electrode foil, the insulating paper, and the negative electrode foil together is impregnated with 3-ethylenedioxythiophene and 4-ethylenedioxythiophene as a monomer, and then immersed in a mixed solution of an oxidizing agent and a solvent and having a predetermined temperature. Dried at a high temperature, and polymerized to the inside of the etching groove of the capacitor to form an electroconductive polymer layer of dense polyethylene dioxythiophene in the winding device to produce an aluminum wound solid electrolyte capacitor, It is a capacitor using a conductive polymer as an electrolyte in a wound device, which not only reduces short defects of the product, but also has excellent effects of impedance and equivalent series resistance (ESR) at high frequencies (100 to 300 kHz).

Claims (1)

Converting to a rated voltage to recover the chemical conversion film of the high-temperature treated anode electrode foil 10 of the winding element; Between the positive electrode foil and the negative electrode foil was inserted an insulating paper 30 made of low density manilaji winding the positive electrode electrode 10, the negative electrode foil 20 and the insulating paper wound together at a temperature of 250 ℃ Heat-treating for 3 hours to reduce the density of the insulating paper; The low-density device was deposited in ferric toluene sulfonic acid, an oxidizing agent solution, and mixed and deposited monomer 3-ethylene dioxythiophene and 4-ethylene dioxythiophene in a ratio of 1: 3 with methanol. Drying at 75 ° C. for 3 hours to form a conductive polymer polymerization layer; The polymerized device was immersed in an aqueous solution of acetonitrile (acetonitrile: pure water = 8: 2) for 5 minutes, and then dried for 10 minutes at a temperature range of 80 ° C. to contain some moisture in the device. ; Storing and assembling the polymerized element into a sealing member and a case; A method of manufacturing an aluminum wound solid electrolytic capacitor, comprising the step of aging the assembled capacitor.

Images