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Diaphragms for Aluminum Electrolytic Capacitors and Aluminum Electrolytic Capacitors

A technology for aluminum electrolytic capacitors and diaphragms, which is applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of reduced physical strength of diaphragms, achieve high voltage resistance, and reduce short-circuit failure rates

Active Publication Date: 2021-06-22
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the heat applied in the carbonization treatment step of the separator causes thermal decomposition of the cellulose, which leads to a decrease in the physical strength of the separator
In addition, since cellulose itself is gradually decomposed under acidic conditions, when the capacitor element is soaked in a conductive polymer solution containing an oxidizing agent and an aqueous dispersion solution, the physical strength of the separator is significantly reduced.

Method used

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  • Diaphragms for Aluminum Electrolytic Capacitors and Aluminum Electrolytic Capacitors
  • Diaphragms for Aluminum Electrolytic Capacitors and Aluminum Electrolytic Capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092]50% by mass of acrylic fibers and 50% by mass of fibrillated acrylic fibers were mixed. Cylinder papermaking was carried out using the obtained raw material, and heat treatment and touch roll pressing were performed at 150° C. with a dry surface, and the separator of Example 1 was produced.

[0093] The separator of Example 1, the thickness is 30 μm, and the density is 0.55 g / cm 3 , the average pore size is 0.52μm, and the wet tensile strength is 0.69kN / m.

Embodiment 2

[0095] Polyethylene terephthalate polyester fiber (hereinafter referred to as "PET fiber") mixed with 50% by mass of acrylic fiber, 25% by mass of fiber, and 25% by mass of fiber to avoid elongation during production. Ethylene terephthalate polyester fiber (hereinafter referred to as "unstretched PET fiber"). Cylinder papermaking was carried out using the obtained raw material, and heat treatment and touch roll pressing were performed at 150° C. with a dry surface, and the separator of Example 2 was produced.

[0096] The diaphragm of embodiment 2 has a thickness of 60 μm and a density of 0.20 g / cm 3 , the average pore size is 14.7μm, and the wet tensile strength is 1.10kN / m.

Embodiment 3

[0098] 50% by mass of semi-aromatic polyamide fibers, 25% by mass of fibrillated acrylic fibers, and 25% by mass of unstretched PET fibers were mixed. Cylinder papermaking was performed using the obtained raw material, and the surface was heat-treated at 150° C. and pressed with a touch roll to produce the separator of Example 3.

[0099] The diaphragm of embodiment 3 has a thickness of 20 μm and a density of 0.40 g / cm 3 , the average pore size is 9.70μm, and the wet tensile strength is 1.60kN / m.

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Abstract

The present invention provides a separator for aluminum electrolytic capacitors having at least one layer of wet non-woven fabric layer inserted between a pair of electrodes, wherein the wet non-woven fabric layer has an average pore diameter in the range of 0.5 to 15 μm, and, at 70° C. The wet tensile strength after immersion in exchanged water for 30 minutes was 0.30 kN / m or more. The separator is a wet-laid nonwoven fabric formed of synthetic fibers. Preferably, the wet-laid nonwoven fabric layer contains 25% by mass or more of acrylic fibers. In addition, the aluminum electrolytic capacitor using the above-mentioned separator can achieve a high withstand voltage while reducing the short-circuit failure rate during aging and reducing the element short-circuit failure rate.

Description

technical field [0001] The present invention relates to a separator suitable for an aluminum electrolytic capacitor and an aluminum electrolytic capacitor using the same. Background technique [0002] In recent years, with the digitalization of electronic equipment and automotive electrical equipment, these equipment have been developed to be more functional and high-performance. In addition, in order to miniaturize these equipment, circuit boards, etc. used in equipment are also required to be miniaturized. . [0003] Aluminum electrolytic capacitors using conductive polymers as cathode materials (hereinafter referred to as "solid electrolytic capacitors") have better ESR (equivalent series resistance) characteristics than aluminum electrolytic capacitors using electrolyte solutions as cathode materials. Therefore, miniaturization can be achieved by reducing the number, and they are used in computers, game machines, and the like. In computers and the like, higher speeds a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/02H01G9/042
CPCH01G9/02H01G9/042Y02E60/13H01G9/0425
Inventor 熊冈弘伦森本健太石休正树越智贵史
Owner NIPPON KODOSHI