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Sealer for capacitor and aluminum electrolytic capacitor using same

A sealing body and capacitor technology, which is applied in the direction of capacitor shell/packaging, capacitor parts, etc., can solve the problem of inability to reduce electrolyte evapotranspiration, and achieve the effect of inhibiting evapotranspiration

Active Publication Date: 2012-05-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the extended life of the capacitor, which is 2,000 to 10,000 hours at 105°C, the rubber seal will pass through, and the evaporation of the electrolyte cannot be reduced.

Method used

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  • Sealer for capacitor and aluminum electrolytic capacitor using same
  • Sealer for capacitor and aluminum electrolytic capacitor using same
  • Sealer for capacitor and aluminum electrolytic capacitor using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] figure 1 It is a perspective view of the aluminum electrolytic capacitor in Embodiment 1 of this invention. The capacitor element 31 is constituted by winding the anode foil 32 and the cathode foil 33 formed of aluminum foil with a separator 34 interposed therebetween. The lead wire 5 is bonded to the anode foil 32 . The lead wire 5 has a joining portion 5A to which the anode foil 32 is joined, and a solderable external lead portion 5B. The lead wire 6 is bonded to the cathode foil 33 . The lead 6 also has a bonding portion and an external lead-out portion in the same manner.

[0041] The capacitor element 31 is impregnated with an electrolytic solution (not shown), and is accommodated in a bottomed cylindrical case 35 made of aluminum. The opening of the case 35 is sealed by the sealing body 11 . The outer periphery of the case 35 is covered by the exterior member 36 .

[0042] The electrolyte is prepared by dissolving an electrolyte salt in a solvent. The solve...

Embodiment 1～12

[0083] Materials constituting the sealing bodies of Examples 1 to 12 of the present embodiment are shown below. In addition, the composition (parts by weight) of each Example is shown in (Table 1).

[0084] Butyl rubber (268 manufactured by JSR) was used as a polymer, and an alkylphenol formaldehyde resin was used as a crosslinking agent. Five kinds of natural mica were used as the flat inorganic substance 13 as shown below. The average particle size of mica A was 20 μm, and the aspect ratio was 0.567. The average particle size of mica B was 23 μm, and the aspect ratio was 0.577. The average particle size of mica C was 25 μm, and the aspect ratio was 0.584. The average particle size of mica D was 30 μm, and the aspect ratio was 0.602. The average particle size of mica E was 50 μm, and the aspect ratio was 0.672. Silicone oil-treated silica (polysulfide manufactured by Daiso) or silane-coupling-treated clay (vinylsilane manufactured by BASF) was used as the inorganic fille...

Embodiment approach 2

[0098] 5A to 5C It is a schematic diagram which shows the procedure of press molding of the sealing body 11 in Embodiment 2 of this invention. The basic structure of the aluminum electrolytic capacitor of the present embodiment is the same as that of the first embodiment except for the sealing body 11 . In this embodiment, instead of the sheet 14 in the first embodiment, a sheet 20 obtained by laminating two types of sheets 20A and 20B having different contents of the flat inorganic substance 13 is used. As a result, the distribution of the flat inorganic substances 13 in the sealing body 11 is different. Otherwise, it is the same as that of Embodiment 1.

[0099] Below, refer to 5A to 5C The manufacturing method of the molded object 18B which is the precursor of the sealing body 11 of this embodiment is demonstrated. First, as Figure 5A As shown, using the lower die 16 in which two pins 16A were erected on the bottom surface of the cylindrical recess, and the upper di...

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Abstract

A sealer for cylindrical capacitors has a round first planar surface and a round second planar surface on the side opposite to this first planar surface, and two lead holes are provided passing through the first and second planar surfaces. This sealer for capacitors comprises butyl rubber and a flat inorganic material. Furthermore, the sealer has a first part and second parts, which are in the proximity of the periphery of the sealer and in the proximity of the two lead holes. The flat inorganic material is scattered in the first part such that the flat surface thereof is oriented substantially parallel to the first planar surface. The flat inorganic material is scattered in the second part such that the flat surface thereof is oriented in a substantially perpendicular direction to the first planar surface.

Description

technical field [0001] The present invention relates to a sealing body used for an aluminum electrolytic capacitor, and an aluminum electrolytic capacitor using the sealing body. Background technique [0002] The aluminum electrolytic capacitor has a capacitor element as a functional part. The capacitor element is formed by winding an anode foil and a cathode foil made of aluminum foil with a separator therebetween. Lead terminals are previously fixed to the anode foil and the cathode foil, respectively. A rubber sealing body is attached to the lead terminal, and the separator is impregnated with an electrolyte, then the capacitor element is inserted into a bottomed cylindrical metal case, the opening of the metal case is sealed by the sealing body, and the This is used to make aluminum electrolytic capacitors. [0003] The characteristics of aluminum electrolytic capacitors are closely related to the electrolyte solution used for the capacitor, so in order to improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/10
CPCH01G9/10
Inventor 广田洁椿雄一郎岛中胜史
Owner PANASONIC CORP
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