Sealed prismatic storage battery

DETAILED DESCRIPTION The present invention provides a sealed prismatic storage battery having a high volumetric energy density and using a battery case with a high compressivity A sealed prismatic storage battery in accordance with an exemplary embodiment of the present invention comprises a prismatic battery case having an opening, with electrodes and electrolyte, both contained in the foregoing battery case, and a cover whereby the opening is closed by sealing.
The aforementioned battery case has a plurality of almost flat plane sections, corner sections situated between two of the plurality of almost flat plane sections and junctions existing between the corner sections and respective flat plane sections.
At least the inner surface of each respective corner section has a curvature and the thickness of the junctions is smaller than that of the flat plane sections and corner sections.
In the structures as described above, it is particularly preferred that the aforementioned electrodes comprise a plurality of positive electrodes and negative electrode plates, and separators placed between positive electrodes and negative electrodes.
The aforementioned cover is particularly preferred to have a safety vent.
Each of the aforementioned corner sections is particularly preferred to have a curving outer surface.
Each respective section between the foregoing corner sections and junctions and also between the foregoing junctions and flat plane sections is particularly preferred to change continuously in thickness.
It is particularly preferred that the position where the foregoing junction becomes smallest in thickness coincides with the position of the foregoing flat plane sections where the radius of the circular arc forming the inner surface of the foregoing corner section crosses the outer surface of the flat plane section perpendicularly.
It is preferred that the thickness of the foregoing junction is larger than one half of the smallest thickness of the flat plane section as described above