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An ultra-high voltage forming foil forming process for aluminum electrolytic capacitors

An aluminum electrolytic capacitor and ultra-high voltage technology, applied in the direction of electrolytic capacitors, capacitors, electrolytic coatings, etc., can solve the problems of low reaching voltage, poor life, flash fire, etc. The effect of reducing the concentration of negative ions

Active Publication Date: 2020-12-11
INNER MONGOLIA ULANQAB DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the production process of ultra-high voltage formed foil, due to the applied high forming voltage, serious flash fire phenomenon is very easy to occur. Once this phenomenon occurs, it will have a negative impact on the quality of formed foil products, mainly reflected in the deviation of the reached voltage of formed foil. Low, low capacity and poor performance, etc., ultimately lead to low working voltage and poor life of the aluminum electrolytic capacitor products made of it, which greatly limits its application fields
In addition, with the rapid development of aerospace, frequency converters, super large power supplies and other fields, the requirements for the working voltage of the ultra-high voltage aluminum electrolytic capacitors used are getting higher and higher, and there is an urgent need for ultra-high voltage formed foil products above 1000V, and At present, the formed foil products are very rare in the market, the main reason is that there is no suitable formation process for producing ultra-high voltage formed foils above 1000V to solve the problems such as flash fire during the formation process

Method used

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  • An ultra-high voltage forming foil forming process for aluminum electrolytic capacitors
  • An ultra-high voltage forming foil forming process for aluminum electrolytic capacitors
  • An ultra-high voltage forming foil forming process for aluminum electrolytic capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Take the 99.99% aluminum foil after electrolytic corrosion treatment and immerse it in pure water at 97°C for 15 minutes;

[0030] The second step: in the first stage, the concentration of boric acid is 50g / L, the concentration of citric acid is 5g / L, the concentration of ammonium pentaborate is 10g / L, the temperature of the bath is 85°C, the formation voltage is 220V, and the current density is 50mA / cm 2 , the formation time is 8 minutes;

[0031] The third step: in the second stage, the concentration of boric acid is 50g / L, the concentration of citric acid is 1g / L, the concentration of ammonium pentaborate is 6g / L, the temperature of the bath is 85°C, the formation voltage is 450V, and the current density is 35mA / cm 2 , the formation time is 8 minutes;

[0032] The fourth step: in the third stage, the concentration of boric acid is 50g / L, the concentration of tetramethylammonium hydroxide is 0.35g / L, the concentration of mannitol is 1g / L, the temperature of t...

Embodiment 2

[0042] Example 2 except the eighth step: immerse the fourth grade of the foil that has been chemically converted for the second time in an aqueous phosphoric acid solution with a concentration of 50ml / L at 60°C for 6 minutes; there are some differences from Example 1, and the rest of the steps are the same as Example 1 .

Embodiment 3

[0056] Step 1: Take the 99.99% aluminum foil after electrolytic corrosion treatment and soak it in pure water at 97°C for 16 minutes;

[0057] The second step: in the first stage, the concentration of boric acid is 50g / L, the concentration of citric acid is 2g / L, the concentration of ammonium pentaborate is 10g / L, the temperature of the bath is 85°C, the formation voltage is 260V, and the current density is 50mA / cm 2 , the formation time is 8 minutes;

[0058] The third step: in the second stage, the concentration of boric acid is 50g / L, the concentration of citric acid is 0.5g / L, the concentration of ammonium pentaborate is 1g / L, the temperature of the bath is 85°C, the formation voltage is 530V, and the current density is 35mA / cm 2 , the formation time is 8 minutes;

[0059] The fourth step: use boric acid concentration of 50g / L in the third stage, tetramethylammonium hydroxide concentration of 0.25g / L, mannitol concentration of 0.5g / L, bath temperature of 85°C, formation v...

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Abstract

The invention relates to an ultrahigh-pressure formed foil forming technology for an aluminum electrolytic capacitor. An existing boric acid forming technology is improved, high-purity aluminum foil obtained after corroding and face expanding is subjected to a hydration reaction, then four-stage formation is conducted with first-stage and second-stage electrolytic liquid being a mixed solution ofboric acid, citric acid and ammonium pentaborate and third-stage and fourth-stage electrolytic liquid being a mixed solution of boric acid, tetramethyl ammonium hydroxide and mannitol. In addition, proper phosphoric acid treatment strength is selected in aftertreatment, the voltage of the formed foil can reach 1200 V, and therefore the application field of the formed foil is further expanded.

Description

technical field [0001] The invention relates to the field of anode aluminum foils for "aluminum electrolytic capacitors", in particular to an ultra-high voltage forming foil forming process for aluminum electrolytic capacitors. Background technique [0002] Anode aluminum foil (also known as chemical formation foil) for aluminum electrolytic capacitors is manufactured through a series of chemical formation processes such as electrochemical anodic oxidation of high-purity aluminum foil after corrosion and expansion. Formed foils with a withstand voltage above 750V are called ultra-high voltage formed foils, and have become one of the important development directions in the field of formed foils in recent years. The more common formation process for producing ultra-high pressure formed foil is: first, soak the high-purity aluminum foil after corroding and expanding the surface in deionized water at 90-100°C for 10-20 minutes, and then place the aluminum foil in a concentration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/10H01G9/055
CPCC25D11/08C25D11/10H01G9/055
Inventor 邓本委王海蓉毛思坦
Owner INNER MONGOLIA ULANQAB DONGYANGGUANG FORMED FOIL CO LTD
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