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Air-tight tantalum foil type electrolytic capacitor and preparation method thereof

An electrolytic capacitor, hermetically sealed technology, applied in the field of capacitors, can solve problems such as circuit corrosion, capacitor life reduction, electrolyte leakage, etc., and achieve the effects of strong temperature shock resistance, excellent sealing performance and high reliability

Pending Publication Date: 2021-06-18
CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The packaging structure of tantalum foil electrolytic capacitors is simple. The traditional manufacturing process only relies on polytetrafluoroethylene plugs for packaging, which is very prone to electrolyte leakage, which not only reduces the life of the capacitor, but also has the risk of circuit corrosion. The service life is also affected, causing unnecessary losses

Method used

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  • Air-tight tantalum foil type electrolytic capacitor and preparation method thereof
  • Air-tight tantalum foil type electrolytic capacitor and preparation method thereof
  • Air-tight tantalum foil type electrolytic capacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 250V15μF airtight electrolytic capacitor as an example

[0026] Hermetic-sealed electrolytic capacitor, including capacitor core, metal case, and acid-resistant glass powder insulator with tantalum tube; the capacitor core is placed in the metal case, the acid-resistant glass powder insulator is fixed at both ends of the metal case, and the anode is drawn out from both ends of the capacitor core Tantalum wire and cathode tantalum wire; anode tantalum wire and cathode tantalum wire pass through the tantalum tube on the acid-resistant glass powder insulator respectively, and connect with the positive and negative lead-out wires; the anode tantalum wire, cathode tantalum wire and the outlet of the tantalum tube are ball-welded seal.

[0027] The silver shell is a cylindrical hollow silver tube with a silver content of 99.99% and a wall thickness of 0.4 mm. Rolling grooves are pressed at both ends, and the margin after the rolling grooves is 1.6 mm to 2.2 mm; The shel...

experiment example 1

[0037] Experimental Example 1 Performance Research

[0038] Take the air-sealed tantalum foil electrolytic capacitor (250V15 μF) prepared by the embodiment of the present invention, and the semi-sealed structure tantalum foil electrolytic capacitor (250V15 μF) that is directly packaged after the European tradition adopts the polytetrafluoroethylene plug and the shell groove as a comparison, Test its performance, the results are shown in Table 1.

[0039] Table 1 Performance parameters of different tantalum foil electrolytic capacitors

[0040]

[0041]

[0042] It can be seen from Table 1 that compared with the traditional tantalum foil electrolytic capacitor with a semi-hermetic structure that is directly packaged after the PTFE plug is rolled and grooved with the shell, the sealing performance is superior, the temperature shock resistance is stronger, and the reliability is higher. Higher, effectively reducing the risk of liquid leakage in some electronic circuits wit...

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Abstract

The invention belongs to the technical field of capacitors, and particularly relates to an air-tight seal tantalum foil type electrolytic capacitor and a preparation method thereof. The air-tight electrolytic capacitor comprises a capacitor core, a silver tube shell and acid-resistant glass powder insulators with tantalum tubes; the capacitor core is placed in the silver tube shell, and the acid-resistant glass powder insulators are fixed at two ends in the silver tube shell; an anode tantalum wire and a cathode tantalum wire are led out from two ends of the capacitor core, penetrate through the tantalum tubes on the acid-resistant glass powder insulators and are respectively butted with an anode outgoing line and a cathode outgoing line; and the capacitor core is formed by sequentially stacking and winding capacitor paper, an anode tantalum foil, capacitor paper, a cathode tantalum foil and capacitor paper. The air-tight seal tantalum foil type electrolytic capacitor provided by the invention is excellent in sealing performance, high in temperature impact resistance and higher in reliability, and effectively reduces the risk of liquid leakage in some electronic circuits with higher use requirements.

Description

technical field [0001] The invention belongs to the technical field of capacitors, in particular to a hermetically sealed tantalum foil electrolytic capacitor and a preparation method thereof. Background technique [0002] Tantalum foil electrolytic capacitors can withstand high temperature (up to 200°C) and high voltage (up to 450V), and bipolar tantalum foil electrolytic capacitors can also be used in electronic equipment such as instruments and meters. Transformed DC or pulse circuits and many other excellent properties are widely used in various civilian and military electronic products. Tantalum foil electrolytic capacitors occupy an important position in the field of capacitors and are irreplaceable in some circuit structure designs. [0003] The packaging structure of tantalum foil electrolytic capacitors is simple, and the traditional manufacturing process only relies on polytetrafluoroethylene plugs for packaging, which is very prone to electrolyte leakage, which n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/08H01G9/048
CPCH01G9/048H01G9/08H01G2009/05
Inventor 吴疆李传龙肖毅张勇曾金萍艾文娟张麟石洪富蒙林斌朱文娟潘齐凤
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD