Chemistry: electrical current producing apparatus – product – and – Means externally releasing internal gas pressure from closed... – Elastic – resilient or spring biasing valve means
Patent
1985-11-29
1987-04-21
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
Means externally releasing internal gas pressure from closed...
Elastic, resilient or spring biasing valve means
429 57, 429 60, 429159, H01M 1006, H01M 202
Patent
active
046596364
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a sealed storage battery and, more particularly, to a storage battery comprising a plurality of unitary cells wherein polar plate groups are sealed in outer bags made of a film or sheet of synthetic resin.
BACKGROUND ART
With portable electric appliances such as VTR, vacuum cleaner and others being rendered compact, a battery for use as an electric power source therefor has been strongly desired to be made compact. As an electric power source for the above described types of portable electric appliances, a lead storage battery and a nickel-cadmium storage battery are mainly utilized.
The lead storage battery makes use of a battery case of synthetic resin having a plurality of, for example, three, cell chambers, and is of such a construction that polar plate groups are inserted into the respective cell chambers with cells being connected together by means of a connector means fluid-tightly passing through partition walls.
In the nickel-cadmium storage battery, an exemplary type is that a plurality of unitary cells armored in metallic vessels are combined together and are in turn inserted into a single vessel.
However, in the lead storage battery of the above described construction, there is a problem in that not only is it difficult to make the battery thin because of the partition walls separating the cell chambers, but also the manufacturing cost tends to become high because a complicated fabricating step is required wherein the polar plate groups are incorporated individually into the respective cell chambers in a battery case. Also, in the lead storage battery, while it is essential to apply an appropriate pressure, that is, a so-called group pressure to the polar plate groups in order to prevent active substances of an anode from being particulated and to prolong the lifetime of the battery, a problem arises wherein, since the group pressure differs from one cell to another, the cells are not uniform in lifetime. Moreover, in a sealed storage battery wherein the quantity of electrolyte is controlled, since the quantity of the electrolyte retained by a separator means varies when the group pressure differs from one cell to another, a disadvantage arises in that the capacity varies. Even in the nickel-cadmium storage battery, since the completely independent cells are combined, there is a problem in that wasteful spaces are many and the capacity efficiency for a battery is low.
DISCLOSURE OF THE INVENTION
The present invention has for its object to eliminate the conventional existing disadvantages such as described above and to provide a highly reliable sealed storage battery which is thin and easy to fabricate.
The sealed storage battery of the present invention comprises a plurality of flattened unitary cells which comprises polar plate groups including an anode plate, a cathode plate and a separator separating these polar plates, and outer bags made of sheets or films of synthetic resin and into which the polar plate groups and electrolyte retained by the polar plate groups are sealed, and a casing for accommodating the plurality of the unitary cells in a form stacked one above the other in a direction thicknesswise of the unitary cells wherein, owing to the casing, the unitary cells are held under pressure in said stacking direction, and said casing has enough rigidity to withstand a reactive force relative to said pressure.
The unitary cells have a sealed area provided at a portion of the outer bag surrounding the perimeters of the polar plate groups, a pair of terminal pieces extending outwards through the sealed area, and a safety valve provided in a portion of the outer bag, and these unitary cells are electrically series-connected by interconnecting said terminal pieces.
In a preferred form of the unitary cells, the sealed are of the outer bag is constituted by a heat-bonded area interconnecting the sheets or films of synthetic resin, and the safety valve has a tight contact area at which the resin films or sheets overlap each other wit
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patent: 4374186 (1983-02-01), McCartney et al.
patent: 4383011 (1983-05-01), McClelland et al.
patent: 4525926 (1985-07-01), Pearson
Kadowaki Minoru
Koike Kiichi
Suzuki Yoshie
Yoshinaka Minoru
Matsushita Electric - Industrial Co., Ltd.
Skapars Anthony
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