Manufacturing method of electrode foil for aluminum electrolytic capacitor and electrode foil

A technology for aluminum electrolytic capacitors and a manufacturing method, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of short hole length, no contribution to the specific volume of the corroded foil, etc., and achieves thinning of thickness, reduction of ineffective dissolution, and distribution of pores on the surface. uniform effect

Active Publication Date: 2021-07-16
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of the tunnel hole caused in the late stage of electrification will eventually form a tunnel hole with a small diameter and a short hole length. After the formation step, there is a possibility of being blocked, and it does not contribute to the specific volume of the corroded foil.

Method used

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  • Manufacturing method of electrode foil for aluminum electrolytic capacitor and electrode foil
  • Manufacturing method of electrode foil for aluminum electrolytic capacitor and electrode foil
  • Manufacturing method of electrode foil for aluminum electrolytic capacitor and electrode foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The manufacturing method of the electrode foil for aluminum electrolytic capacitor provided in this embodiment comprises the following steps:

[0038] (1) Pretreatment step: Soak the electronic aluminum foil in 40°C and 2% sodium hydroxide aqueous solution by mass for 80 seconds, then wash the aluminum foil with pure water at room temperature to obtain a pore corrosion treatment. aluminum foil;

[0039] (2) Pore corrosion treatment step: place the pretreated aluminum foil in an aqueous solution containing hydrochloric acid, sulfuric acid and aluminum ions at a temperature of 75°C for energized porosity corrosion. The aqueous solution containing hydrochloric acid, sulfuric acid and aluminum ions is used The mass percent contents of hydrochloric acid, sulfuric acid and aluminum ions in the medium are 3.5%, 28%, and 1% respectively, and the energized current curve adopted in the porosity corrosion treatment is the attenuation mutation current curve, and the waveform diagra...

Embodiment 2

[0045] The manufacturing method of the electrode foil for aluminum electrolytic capacitor provided in this embodiment comprises the following steps:

[0046] (1) Pretreatment step: soak the electronic aluminum foil in 50°C and 1% sodium hydroxide aqueous solution by mass for 70 seconds, and then wash the aluminum foil with pure water at room temperature to obtain a pore corrosion treatment. aluminum foil;

[0047] (2) Pore corrosion treatment step: place the aluminum foil after pretreatment in an aqueous solution containing hydrochloric acid, sulfuric acid and aluminum ions at a temperature of 70°C for energized porosity corrosion, and the aqueous solution containing hydrochloric acid, sulfuric acid and aluminum ions is used The mass percent contents of hydrochloric acid, sulfuric acid and aluminum ions in the medium were 4%, 35%, and 0.8% respectively, and the energized current curve adopted in the porosity corrosion treatment was the attenuation mutation current curve, and t...

Embodiment 3

[0053] The manufacturing method of the electrode foil for aluminum electrolytic capacitor provided in this embodiment comprises the following steps:

[0054] (1) Pretreatment step: Soak the electronic aluminum foil in 60°C and 0.6% by mass sodium hydroxide aqueous solution for 90 seconds, then wash the aluminum foil with pure water at room temperature to obtain a pore corrosion treatment. aluminum foil;

[0055] (2) Pore corrosion treatment step: place the pretreated aluminum foil in an aqueous solution containing hydrochloric acid, sulfuric acid and aluminum ions at a temperature of 68°C for energized porosity corrosion. The aqueous solution containing hydrochloric acid, sulfuric acid and aluminum ions is used The mass percent contents of hydrochloric acid, sulfuric acid and aluminum ions in the medium were 5%, 40%, and 1% respectively, and the energized current curve adopted in the porosity corrosion treatment was the attenuation mutation current curve, and the waveform diag...

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Abstract

The invention belongs to the technical field of aluminum electrolytic capacitors, and specifically discloses a method for manufacturing an electrode foil for an aluminum electrolytic capacitor and the prepared electrode foil. In the method for manufacturing electrode foil for aluminum electrolytic capacitors provided by the present invention, the energized current curve adopted in the pore corrosion treatment step is a decaying abrupt current curve, the first half of the energized current curve is a decaying current, and the initial current density is large, which is used for power generation. The growth of pores and holes; after a certain period of time, the current density is suddenly reduced from a large value to a small constant current, which is used to attenuate the growth of all hole lengths induced by the current. The method for manufacturing the electrode foil for aluminum electrolytic capacitors provided by the present invention reduces the occurrence of small holes and short holes in the electrode foil, and the surface holes of the prepared corroded foil are uniformly distributed, the length of the corrosion tunnel holes is uniform, and the length of the holes in the cross-sectional direction is uniform; at the same time The surface erosion of the aluminum foil is reduced, the ineffective dissolution of the aluminum foil is reduced, the thickness of the aluminum foil is less thinned, and the mechanical strength of the electrode foil is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolytic capacitors, in particular to a method for manufacturing an electrode foil for an aluminum electrolytic capacitor, and also to the prepared electrode foil. Background technique [0002] Aluminum electrolytic capacitors are widely used in electronic equipment due to their significant advantages such as large electrostatic capacity, self-healing properties, low price, outstanding ripple current resistance, and long-lasting reliability. In recent years, the miniaturization of electronic equipment has required the size of aluminum electrolytic capacitors to be smaller and smaller. Accordingly, electrode foils used have been required to have higher capacitance, and the surface area of ​​aluminum foil has been enlarged more efficiently. [0003] At present, the medium and high pressure corrosion process commonly used by domestic corroded foil manufacturers includes steps such as pretreatmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04H01G9/045H01G9/055
CPCC25F3/04H01G9/045H01G9/055
Inventor 方铭清祁菁聃康英茜肖远龙蒋燕
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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