Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Tape or flexible-type cell including tape fuel cells or...
Patent
1993-04-07
1995-01-03
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Tape or flexible-type cell including tape fuel cells or...
429162, 429185, H01M 208
Patent
active
053785576
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a film type battery for use in a portable electric equipment and a battery powered equipment etc., and especially to improvement of a sealing material.
2. Background Art
In recent years, the portable electric equipment and the battery powered equipment have been minimized in size and thickness rapidly, and demands for minimizing size and thickness of batteries for use in these equipments have been increased in proportion to the above tendency. Especially, a demand for film type battery with a high reliability and having a thickness of under 0.5 mm incl. is increasing.
As for a film type battery using light metal represented by lithium as a negative active material, a battery having a thickness of as small as 0.1 mm is produced at present, and in this battery thicknesses of a current collector and a sealing portion become comparatively thin as small as tens of microns.
FIG. 13 is a vertical sectional view showing an example of a conventional film type battery. In the figure, 1 denotes a negative active material layer, 2 denotes a positive active material layer, and 3 denotes an ion conductive electrolyte layer; and a generating element is composed of these components. Metallic lithium, for example, is used for the negative active material. 5 denotes a negative terminal plate, 6 denotes a positive terminal plate, and the terminal plates 5 and 6 serve also as a current collector and a container. A stainless plate and a nickel plate etc. having a thickness of 15 to 30 microns are used for the terminal plates 5 and 6. A frame-shaped sealing material 4, which seals the above generating element in between the both terminal plates 5 and 6 and insulates the terminal plate 5 from the terminal plate 6, is installed on peripheral edges of the terminal plates 5 and 6. The sealing material 4 is made of denatured polypropylene resin.
The film type battery, which utilizes a light metal represented by the lithium as the negative active material, is frequently used for portable electric equipments. In such a case, a reliability i.e. a difficulty to be bent and a durability to long service, in other words a long-term reliability, is required for the film type battery. However, since the sealing material 4 is made of the denatured polypropylene resin in the film type battery having the above-mentioned constructions, its mechanical strength is small so that it is apt to be bent and a clearance is easily produced at a sealing portion. For this reason, when the film type battery having the above construction has been put in service for a long period, there has been such a trouble that a battery performance has been deteriorated due to a leakage of electrolyte or an ingress of moisture and oxygen from the sealing portion. If moisture enters the battery, it reacts with the metallic lithium forming the negative active material so that a battery capacity is lessened.
Further, when installing the sealing material 4 in the film type battery having the above-mentioned construction, the terminal plates 5 and 6 have been thermally bonded to the sealing material 4 after installing the sealing material 4 on the peripheral edges of the terminal plates 5 and 6. However, since a thermal shrinkage factor of the sealing material 4 is different from those of the terminal plates 5 and 6, there has been such a trouble in the same way as the above that a battery performance has been deteriorated due to wrinkles formed on the sealing portion as shown by FIG. 14, so that residual stresses have been produced and a part of the sealing portion has been opened by a stress applied thereon during use of battery so as to permit atmosphere to enter an inside of battery.
A film type battery including the sealing material 4 having a double-layer structure as illustrated in FIG. 15 is also well known. 4a is a negative-side sealing material and 4b is a positive-side sealing material. In this film type battery, in order to avoid an external short-circuiting due to contact of the terminal plate 5 with the t
REFERENCES:
patent: 4520085 (1985-05-01), Wyser
patent: 4548880 (1985-10-01), Suzuki et al.
patent: 5227264 (1993-07-01), Duval et al.
Riyouichi; Jtoh et al., vol. 7, No. 008 (E-152) 13 Jan. 1993 & JP-A-57 165-955 (Matsushita Denki Sangyo K.K.).
Fumichika Katou, vol. 8, No. 66, (E-234-)(1503), Mar. 28, 1984 & JP-A-58 214-271 (Citizen Tokei K.K.).
Izuchi Syuichi
Kato Shiro
Murata Kazuo
Takeuchi Ken-ichi
Kalafut Stephen
Yuasa Corporation
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