Non-aqueous electrolyte battery using a sealing bag...

Details Non-aqueous electrolyte battery using a sealing bag... Non-aqueous electrolyte battery using a sealing bag...

1999-04-02

2001-06-12

Weiner, Laura (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

C429S131000, C429S176000, C429S178000

Reexamination Certificate

active

06245456

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a non-aqueous electrolyte battery used as a power source of electronic instruments. More particularly, it is characterized in that it has a structure, in which a positive electrode, a negative electrode and an electrolytic solution are sealed in a sealing bag, and lead wires of the positive electrode and the negative electrode extend to the outside, and has a structure of high reliability in sealing of the electrolytic solution.
BACKGROUND OF THE INVENTION
Along with compactization of electronic instruments, there is an increasing demand for a compact, thin and light-weight battery. On the other hand, there is a demand for a battery having high energy density and high energy efficiency, and thus a secondary battery such as an Li ion battery is drawing attention. In response to these demands, a proposal has been made, for example, in JP-A-61-240564, in which a sealed lead battery is produced in such a manner that electrode arrays are inserted in a bag made of a thermoplastic resin having acid resistance, and a plurality of the electrode arrays are wrapped with an outer sheath in the form of a bag comprising a synthetic resin in the form of a film, a sheet or a tube.
There are other proposals in JP-A-3-62447 and JP-A-57-115820, in which the hermetic property is improved by using a sheet of the sealing bag having a structure, in which a metallic layer is sandwiched between plastic films.
The provision of the metallic layer greatly improves the hermetic property, but the invasion of water from a sealed part cannot be completely prevented. When water invades a battery, it reacts with an electrolytic solution to produce hydrofluoric acid, which passes through the plastic film layer, thereby likely corroding the metallic layer or promoting peeling between the metallic layer and the plastic layer. The reasons for the occurrence of peeling also is due to the use of a urethane-based adhesive as an anchor coating material for bonding the metallic layer and the plastic layer on the side of the electrolytic solution.
SUMMARY OF THE INVENTION
An object of the invention is to provide a non-aqueous electrolyte battery using a sealing bag for a non-aqueous electrolyte battery that prevents the invasion of water as much as possible, and, even when water does invade to produce hydrofluoric acid, does not suffer corrosion of a metallic layer or peeling between the metallic layer and a plastic layer on the side of an electrolytic solution, while maintaining a thin shape, one of the characteristic features of a sealed battery.
As a result of earnest investigation by the inventors, it has been found that the above described object can be accomplished by a means in which an acid-modified polyethylene, an acid-modified polypropylene or an ionomer is used as a plastic, which is directly bonded to a metallic layer by heat lamination to provide a laminated sheet of metal and plastic, and the laminated sheet is used for a sealing bag of the battery with the plastic side facing the electrolytic solution. As the heat lamination, a conventional method that is generally used for bonding plastics can be employed, and preferably conducted at a temperature at which the plastic used is sufficiently softened. Furthermore, it has also been found that by endowing the plastic layer with a function of preventing the transmission of water and a function of preventing the transmission of an acid, the function of preventing the invasion of water can be greatly improved, and even when water does invade to produce hydrofluoric acid, the metallic layer is not corroded, and peeling between the metallic layer and the plastic layer does not occur.


REFERENCES:
patent: 6001505 (1999-12-01), Fukuda et al.
patent: 57-115820 (1982-07-01), None
patent: 61-240564 (1986-10-01), None
patent: 3-62447 (1991-03-01), None
patent: 9-288998 (1997-11-01), None
patent: 11-7921 (1999-01-01), None

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