Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Patent
1997-12-23
1999-12-21
Maples, John S.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
429175, 429177, 429324, H01M 204, H01M 206
Patent
active
060046937
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/JP97/01396 filed Apr. 23, 1997 which designated the U.S.
1. Technical Field
The present invention relates to a nonaqueous electrolyte battery used as a power source for electronic instruments.
2. Background Art
In conjunction with a demand for electronic instruments having a smaller size and a lighter weight, there has been an increasing demand for batteries having a smaller size and a lighter weight to be used for their power source. In order to satisfy such a demand for batteries, various batteries have been taken into consideration.
For example, Japanese Patent Application Laid-Open No. 61-240564 discloses an enclosed type lead storage battery. In this storage battery, a bag made of an acid-resistant thermoplastic resin accommodating a number of electrode plates inserted therein is enclosed in a jacket formed by a film, sheet, or tube.
In the battery disclosed in Japanese Patent Application Laid-Open No. 61-240564, however, since peripheral parts of metal leads and the jacket are sealed while being directly in contact with each other, its hermetic property is low.
Also, Japanese Patent Application Laid-Open No. 56-71278 discloses a sheet-like battery. In this battery, while the part occupied by its heat-fusing portion is reduced, a lead which has been coated with a resin beforehand is used to improve the reliability of its heat fusion.
The bag for sealing the battery system disclosed in Japanese Patent Application Laid-Open No. 56-71278, however, is formed by a single iodine-resistant fluorine resin. Consequently, in the case of a nonaqueous electrolyte battery whose electrolytic solution is volatile or of an organic solvent system, there is a strong tendency for the electrolytic solution to penetrate through the bag to leak out or for moisture to infiltrate therein from the outside, thereby yielding an inferior hermetic property.
Further, in the battery disclosed in Japanese Patent Application Laid-Open No. 3-62447 or No. 57-115820, its electrode, electrolyte, and the like are sealed in a bag in which a plastic layer made of an acrylic acid modified polyethylene or acrylic acid modified polypropylene ionomer and a metal layer are bonded together.
In the battery disclosed in Japanese Patent Application Laid-Open No. 3-62447 or No. 57-115820, however, the plastic layer made of the acrylic acid modified polyethylene or acrylic acid modified polypropylene ionomer is separated from the bag at a high temperature. Consequently, the hermetic property of the battery is not sufficient.
Thus, the blocking property against the nonaqueous electrolytic solution becomes insufficient, whereby a battery having a sufficient hermetic property has not been obtained yet.
Accordingly, it is an object of the present invention to provide a nonaqueous electrolyte battery having a high blocking property against the nonaqueous electrolytic solution and a high hermetic property.
DISCLOSURE OF THE INVENTION
The present invention provides a nonaqueous electrolyte battery comprising a nonaqueous electrolytic solution; positive and negative electrodes in contact with the nonaqueous electrolytic solution; a separator disposed between the positive and negative electrodes; a first lead having one end connected to the positive electrode and the other end extending to the outside; a second lead having one end connected to the negative electrode and the other end extending to the outside; and a bag for sealing therein the positive and negative electrodes, the separator, the nonaqueous electrolytic solution, and parts of the first and second leads; wherein the bag has a hot-melt resin layer, a metal layer disposed outside the hot-melt resin layer, and an electrolytic-solution-barrier insulating layer disposed between the hot-melt resin layer and the metal layer.
The electrolytic-solution-barrier insulating layer exhibits a very low compatibility with the nonaqueous electrolytic solution. Consequently, the bag attains an enhanced blocking property against the nonaqueo
REFERENCES:
Muneaki Nakai, "Lithium-Iodine Complex Battery with Solid Electrolyte", Jun. 13, 1981, Publication No. 56-71278.
Koroku Namekawa, "Supersonic Acceleration Measuring Apparatus for Moving Reflecting Object", Mar. 18, 1987, Publication No. 62-62268.
Kiichi Koike, "Sealed Lead-Acid Battery", Oct. 25, 1986, Publication No. 61-240564.
Fukuda Yutaka
Hanafusa Koji
Tanaka Keiichi
Maples John S.
Sumitomo Electric Industries Ltd.
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