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Preparation method of low-voltage electrode foil with good bending fatigue strength

A bending fatigue strength, low-voltage electrode technology, applied in the direction of circuits, capacitors, electrical components, etc., can solve the problem of bending fatigue strength decline

Active Publication Date: 2022-03-04
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, according to theoretical knowledge, the capacitance and bending fatigue strength of the electrode foil are a pair of contradictory parameters, that is, the residual corrosion holes on the surface of the electrode foil will inevitably affect its bending fatigue strength, and the bending fatigue strength will increase with the increase of the corrosion hole depth. sharp drop in intensity

Method used

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  • Preparation method of low-voltage electrode foil with good bending fatigue strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1. Immerse the first aluminum foil, the second aluminum foil and the third aluminum foil with a purity of 99.98% and a thickness of 100 μm in a 0.5wt% sodium hydroxide solution. Conditions: temperature 50°C, time 60s;

[0034] S2. Immerse the first aluminum foil obtained in step S1 in 0.25wt% phosphoric acid solution, apply a high-frequency pulse current to perform pre-electrolysis, and the action conditions are: temperature 40°C, time 40s, frequency 14KHz;

[0035] S3. Place the first aluminum foil obtained in step S2 in a mixed solution of 9.0wt% hydrochloric acid, 1.0wt% sulfuric acid, and 1.0wt% oxalic acid for the first electrolytic corrosion, the action conditions: temperature 50 ° C, current is a sine wave Alternating current, current density 0.9A / cm², frequency 45Hz, time 90s; then place it in a mixed solution of 8.0wt% hydrochloric acid, 0.9wt% sulfuric acid, 1.0wt% oxalic acid for the second electrolytic corrosion, working condition: temperature 50 ℃, the cur...

Embodiment 2

[0045] S1. Immerse the first aluminum foil with a purity of 99.98% and a thickness of 100 μm, the second aluminum foil and the third aluminum foil with a purity of 99.98% and a thickness of 10 μm in a 0.5wt% sodium hydroxide solution. Conditions: temperature 50°C, time 60s ;

[0046] S2. Immerse the first aluminum foil, the second aluminum foil and the third aluminum foil obtained in step S1 in a 0.25wt% phosphoric acid solution, and apply a high-frequency pulse current to perform pre-electrolysis. The action conditions are: temperature 40°C, time 40s, Frequency 14KHz;

[0047] S3. Place the first aluminum foil, the second aluminum foil, and the third aluminum foil obtained in step S2 in a mixed solution of 9.0wt% hydrochloric acid, 1.0wt% sulfuric acid, and 1.0wt% oxalic acid for the first electrolytic corrosion. : The temperature is 50°C, the current is a sine wave alternating current, the current density is 0.9A / cm², the frequency is 45Hz, and the time is 90s; then it is p...

Embodiment 3

[0057] S1. Immerse the first aluminum foil with a purity of 99.98% and a thickness of 100 μm, the second aluminum foil and the third aluminum foil with a purity of 99.98% and a thickness of 10 μm in a 0.5wt% sodium hydroxide solution. Conditions: temperature 50°C, time 60s ;

[0058] S2. Immerse the first aluminum foil, the second aluminum foil and the third aluminum foil obtained in step S1 in a 0.25wt% phosphoric acid solution, and apply a high-frequency pulse current to perform pre-electrolysis. The action conditions are: temperature 40°C, time 40s, Frequency 14KHz;

[0059] S3. Place the first aluminum foil, the second aluminum foil, and the third aluminum foil obtained in step S2 in a mixed solution of 9.0wt% hydrochloric acid, 1.0wt% sulfuric acid, and 1.0wt% oxalic acid for the first electrolytic corrosion. : The temperature is 50°C, the current is a sine wave alternating current, the current density is 0.9A / cm², the frequency is 45Hz, and the time is 90s; then it is p...

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Abstract

The invention relates to a preparation method of a low-voltage electrode foil with good bending fatigue strength. The preparation method comprises the following steps: performing oil removal operation on a first aluminum foil, a second aluminum foil and a third aluminum foil; the first aluminum foil is sequentially subjected to pre-electrolysis, electrolytic corrosion, cleaning and drying operation; coating the first aluminum foil with the aluminum-based slurry so as to form primary slurry coating layers on the front and back surfaces of the first aluminum foil; the second aluminum foil and the third aluminum foil are attached to the primary pasting layers in a one-to-one correspondence mode to form composite aluminum foil; performing cold rolling treatment on the composite aluminum foil; and sequentially heating and cooling the composite aluminum foil to obtain the product. In the actual manufacturing and forming process, the electrode foil used as the middle core layer is still fully corroded, so that the phenomenon that the capacitance of the low-voltage electrode foil is greatly reduced due to the change of a preparation process route is avoided. Besides, actual experimental data show that the low-voltage electrode foil prepared by the method has better bending fatigue strength on the premise of keeping the overall thickness unchanged.

Description

technical field [0001] The invention relates to the technical field of electrode foil manufacturing, in particular to a method for preparing a low-voltage electrode foil with good bending fatigue strength. Background technique [0002] The demand for high capacity and miniaturization of electronic components is increasing day by day. In actual production and manufacturing, under the premise of ensuring that the electrode foil needs to have a high capacitance, it is also necessary to ensure that it has good bending fatigue strength (the electrode foil must undergo multiple bendings during the molding preparation and assembly process) ) to avoid shortening its service life due to the generation of bending cracks. [0003] However, according to the past preparation experience, pre-increasing the capacitance of the electrode foil must require its surface to be corroded more fully to form deeper corrosion holes. For example, Chinese invention patent 2021110678726 discloses a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045
CPCH01G9/045Y02E60/13Y02E60/10
Inventor 王建中顾建萍
Owner NANTONG HAIXING ELECTRONICS
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