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Method for preparing formed foil by using asymmetric intermittent positive and negative combined pulses

A combined pulse and intermittent technology, applied in the field of capacitors, can solve the problems of affecting the compactness and uniformity of the oxide film, long negative voltage application time, and breakdown of the oxide film, so as to reduce the phenomenon of concentrated discharge and avoid localized discharge. The effect of shedding and increasing growth rate

Active Publication Date: 2021-03-19
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these methods, the value of the negative voltage is the same as the value of the applied positive voltage, up to 630V, and the negative voltage is applied for a long time. Under such a large and long negative voltage, the oxide film in the foil will be formed A large amount of hydrogen evolution and hydrogen explosion will occur at the interface between the aluminum substrate and the aluminum substrate, which will easily lead to local peeling and tearing of the oxide film layer, and then generate new large defects. These large defects will cause concentrated discharge during the application of forward voltage. Leading to oxide film breakdown, etc., resulting in more defects in the oxide film, and affecting the density and uniformity of the oxide film

Method used

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  • Method for preparing formed foil by using asymmetric intermittent positive and negative combined pulses

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Effect test

Embodiment 1

[0074] A. Pretreatment: boil the corroded foil in pure water at 97°C for 10 minutes;

[0075] B. Primary formation: Place the pretreated electrode foil in the formation solution for formation. When the voltage reaches the preset voltage of 180V, use the asymmetric intermittent positive and negative combined pulse power-on method to form for 5 minutes;

[0076] C. Secondary formation: Place the electrode foil that has undergone primary formation treatment in the formation solution for formation. When the voltage reaches the preset voltage of 360V, use the asymmetric intermittent positive and negative combined pulse power-on method to form for 8 minutes;

[0077] D. Three-stage formation: Place the electrode foil that has undergone two-stage formation treatment in the formation solution for formation. When the voltage reaches the preset voltage of 520V, use the asymmetric intermittent positive and negative combined pulse power-on method to form for 10 minutes;

[0078] E. Interm...

Embodiment 2

[0086] The difference between this embodiment and embodiment 1 is:

[0087] Asymmetric intermittent positive and negative combination pulse formation parameters: n=3, the voltage V1+ of the positive large pulse is the preset voltage of each step, the time of the positive large pulse T1=0.7ms; the voltage of the negative pulse V-=- 25V, the time of negative pulse T2, T4, T6=0.2ms; the voltage of positive small pulse V2+=25V, the time of positive small pulse T3, T5, T7=0.2ms; the time of non-power stage Toff=0.6 ms.

Embodiment 3

[0089] The difference between this embodiment and embodiment 1 is:

[0090] Asymmetric intermittent positive and negative combined pulse formation parameters: n=2 The voltage V1+ of the positive large pulse is the preset voltage of each step, the time T1 of the positive large pulse=1ms; the voltage of the negative pulse V-=-50V, The time of negative pulse T2~T4=0.4ms; the voltage of positive small pulse V2+=50V, the time of positive small pulse T3~T5=0.4ms; the time Toff of no power-on stage=1ms.

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Abstract

The invention belongs to the technical field of capacitors, and discloses a method for preparing a formed foil by using an asymmetric intermittent positive and negative combined pulse repeated power-up mode, and the waveform of the asymmetric intermittent positive and negative combined pulse sequentially comprises a positive large pulse, a negative pulse and a positive small pulse. The voltage ofthe positive large pulse is greater than the absolute value of the negative pulse voltage, and the time of the positive large pulse is greater than the time of the negative pulse voltage. According tothe preparation method, a negative pulse stage is added in the formation process, and meanwhile, the voltage and time of the negative pulse are smaller than those of the positive pulse, so that the phenomena of massive hydrogen evolution, hydrogen explosion and the like generated on an interface between aluminum oxide and an aluminum matrix in the formed foil are reduced, and the defects caused by local falling and tearing of an oxide film layer are avoided.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a method for preparing chemically formed foil by using asymmetric intermittent positive and negative combined pulses. Background technique [0002] With the rapid development of electronic technology, further improving the ripple resistance of aluminum electrolytic capacitors can meet the needs of the existing electronic market development. Especially in capacitors used in fields such as electric welding machines, flash lamps, and high-energy storage and fast charging and discharging, the requirements for capacitor ripple resistance are more stringent. Formed foil, as the core material for the preparation of aluminum electrolytic capacitors, is the key to improving the performance of capacitors. [0003] The common oxidation method in the formation of the anode foil of the existing aluminum electrolytic capacitor is DC anodic oxidation, which generates a large amount of Joule...

Claims

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Application Information

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IPC IPC(8): H01G9/055H01G9/04C25D11/02C25D11/12C25D11/08
CPCH01G9/055H01G9/04C25D11/024C25D11/12C25D11/08
Inventor 朱荣贵邓利松余英凤吴楠何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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