Preparation method of a low-voltage large-capacity polymer chip laminated aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and polymer sheets, which is applied in the manufacture of electrolytic capacitors, electrolytic capacitors, solid electrolytic capacitors, etc., can solve the problems of unsatisfactory, limited improvement effect, large difference in hole structure of the formed foil oxide layer, etc. Achieve the effect of increasing the capacity of finished products, considerable economic benefits, and increasing the rate of capacity extraction

Active Publication Date: 2021-12-07
福建国光新业科技股份有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the large difference in the pore structure of the oxide layer of the formation foil with different formation voltages, the use of coupling agents on medium and high voltage formation foils (formation voltage above 9VF, used to prepare products with working voltage above 6.3V) to increase the capacity lead-out rate is more effective. Obviously, the capacity lead-out rate can generally be increased to more than 90%; however, when applied to extremely low-voltage formed foils (formation voltage below 3.5VF, used to prepare products with operating voltages of 2.5V and below), the improvement effect is limited and cannot meet larger requirements. The demand for the preparation of high-capacity polymer chip laminated aluminum electrolytic capacitors

Method used

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  • Preparation method of a low-voltage large-capacity polymer chip laminated aluminum electrolytic capacitor
  • Preparation method of a low-voltage large-capacity polymer chip laminated aluminum electrolytic capacitor

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preparation example Construction

[0033] see Figure 1-2 , the present invention provides a technical solution: specifically, a method for preparing a low-voltage large-capacity polymer chip laminated aluminum electrolytic capacitor, which is characterized in that it includes the following steps:

[0034] S1. Cutting the chemically formed aluminum foil to obtain the first aluminum foil;

[0035] S2. Coating an insulating barrier glue on the surface of the first aluminum foil, and dividing an anode area and a cathode area to obtain a second aluminum foil;

[0036] S3. Repairing the dielectric layer on the side of the cathode region of the second aluminum foil through a re-chemical conversion process to obtain a third aluminum foil;

[0037] S4. Surface-treating the cathode region of the third aluminum foil by directly impregnating the conductive polymer monomer and drying to obtain the fourth aluminum foil;

[0038] S5. Forming a first conductive polymer layer on the cathode region of the fourth aluminum foil...

Embodiment 1

[0056] S1. Cutting the 2.6VF chemically formed aluminum foil to obtain the first aluminum foil;

[0057]S2. Coating an insulating barrier glue on the surface of the first aluminum foil, and dividing an anode area and a cathode area to obtain a second aluminum foil;

[0058] S3. Repairing the dielectric layer on the side of the cathode region of the second aluminum foil through a re-chemical conversion process to obtain a third aluminum foil;

[0059] S4. Surface treatment is carried out on the cathode area of ​​the third aluminum foil by directly impregnating the conductive polymer monomer and drying to obtain the fourth aluminum foil. The specific method is as follows:

[0060] Immerse the cathode area of ​​the third aluminum foil into thiophene monomer, the purity of thiophene is greater than 99.5%, and the immersion time is 55s; after the immersion, perform drying treatment, the drying temperature is 35°C, and the drying time is 3min;

[0061] S5. Form a first conductive p...

Embodiment 2

[0071] The difference from Example 1 is:

[0072] S4. Surface treatment is carried out on the cathode area of ​​the third aluminum foil by directly impregnating the conductive polymer monomer and drying to obtain the fourth aluminum foil. The specific method is as follows:

[0073] Immerse the cathode area of ​​the third aluminum foil into thiophene monomer, the purity of thiophene is greater than 99.5%, and the immersion time is 65s; after the immersion, perform drying treatment, the drying temperature is 45°C, and the drying time is 6min;

[0074] S5. Form a first conductive polymer layer on the cathode region of the fourth aluminum foil by chemical polymerization to obtain a fifth aluminum foil, the specific method is as follows:

[0075] S51. Immerse the cathode region of the fourth aluminum foil into an aqueous solution of iron p-toluenesulfonate, take it out and dry it to obtain the first intermediate aluminum foil, wherein the proportion of iron p-toluenesulfonate is 15...

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Abstract

The invention discloses a method for preparing a low-voltage and large-capacity polymer chip-type laminated aluminum electrolytic capacitor. The method of impregnating a conductive polymer monomer and drying the surface of the formed foil is used to replace the pre-treatment process of the coupling agent. Matching chemical polymerization method, supplemented by step-type electrochemical polymerization method, the synergistic effect of the two greatly improves the capacity lead-out rate of the formed foil, thereby increasing the capacity of the finished product and meeting the capacity requirements of low-voltage large-capacity polymer chip laminated aluminum electrolytic capacitors. Requirements, improve the yield rate of finished products, and bring considerable economic benefits.

Description

technical field [0001] The invention relates to the technical field of preparation of aluminum electrolytic capacitors, in particular to a preparation method of a low-voltage large-capacity polymer chip laminated aluminum electrolytic capacitor. Background technique [0002] The polymer chip laminated aluminum electrolytic capacitor is affected by the product structure and preparation process. When the specific volume of the formed foil and the size of the package are fixed, and the number of stacked layers is limited, its capacitance mainly depends on the capacity extraction rate of the formed foil. The key The process is the surface treatment of the oxide layer of the formed foil and the preparation of the conductive polymer layer. In the prior art, in order to increase the capacity extraction rate of the formed foil, a coupling agent is generally used to treat the oxide layer of the formed foil, and then combine chemical polymerization and electrochemical polymerization t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055H01G9/045H01G9/15H01G9/00
CPCH01G9/0032H01G9/0036H01G9/045H01G9/055H01G9/15
Inventor 王国平谢盼盼林晓辉陈巧琳张秋水连金水刘建安
Owner 福建国光新业科技股份有限公司
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