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Electrolytic capacitor manufacturing method

A technology for electrolytic capacitors and manufacturing methods, applied in the direction of electrolytic capacitors, capacitors, capacitor parts, etc., capable of solving problems such as inability to meet high withstand voltage, inability to respond to electrolytic capacitors, and low impedance characteristics

Inactive Publication Date: 2005-12-21
NIPPON CHIMI CON CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned electrolytic capacitors cannot cope with such low impedance characteristics, and the upper limit of the withstand voltage is 30V. Although it can handle 28V, it cannot meet the high withstand voltage requirement of 84V or more.

Method used

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Examples

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Embodiment

[0027] Next, the invention is described with examples. The capacitor element is formed by rolling an anode electrode foil and a cathode electrode foil with a separator interposed therebetween. In addition, the anode electrode foil and the cathode electrode foil are connected to lead wires for drawing out the anode and lead wires for drawing out the cathode, respectively.

[0028] These lead wires are constituted by a connection part in contact with each foil, a round bar part integrally formed with the connection part, and an external connection part bonded to the tip of the round bar part. In addition, the connecting portion and the round bar portion are made of 99% aluminum, and the external connecting portion is made of copper-plated iron wire (hereinafter referred to as CP wire). On at least the surface of the round bar portion of the lead wire, an anodic oxide film made of alumina is formed by chemical conversion treatment with an ammonium phosphate aqueous solution. Th...

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Abstract

The present invention provides an electrolytic capacitor having low impedance characteristics, high withstand voltage characteristics of 100 V class, and good high-temperature life characteristics. Adopt the electrolytic solution for electrolytic capacitor that contains aluminum tetrafluoride salt, the moisture content that contains in the capacitor element is controlled to be below 0.7wt%, preferably 0.5wt%, more preferably 0.4wt%, thus can provide having low Electrolytic capacitors with excellent impedance characteristics, high withstand voltage characteristics, and high-temperature life characteristics.

Description

technical field [0001] The present invention relates to a method for manufacturing an electrolytic capacitor, in particular to a method for manufacturing an electrolytic capacitor with low impedance characteristics and high withstand voltage characteristics. technical background [0002] Electrolytic capacitors generally roll up the anode electrode foil and cathode electrode foil with a separator made of manila paper to form a capacitor element. Among them, the strip-shaped high-purity aluminum foil is chemically or electrochemically etched to enlarge the surface of the aluminum foil. , and the aluminum foil is chemically converted in a chemical conversion solution such as ammonium borate aqueous solution to form an oxide film layer on the surface, which is used as an anode electrode foil; the high-purity aluminum foil is only etched to be used as a cathode electrode foil. Further, the capacitor element is housed in a bottomed cylindrical outer case made of aluminum or the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/10
Inventor 小泽正武田政幸宇惠诚
Owner NIPPON CHIMI CON CORP
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