Rectangular alkaline storage battery

Abstract

In a rectangular alkaline storage battery, the sides of negative cores of negative electrode plates 10, which are disposed at the outermost positions of the group of electrode plates and oppose an outer casing can 40, are exposed. The pore ratios (ratio of total area taken up by pores to area of electrode plate) of the exposed cores must be made lower than those of the other unexposed cores. The pore ratio of the exposed negative core is specified as falling within a range of 10% to 40%. As a result, the negative electrode plates 10 are improved in binding strength, thereby inhibiting exfoliation of an active material. Further, there can be obtained a large rectangular alkaline storage battery which has superior permeability for a gas which would arise in the battery, an improved capacity ratio, and greater volumetric energy density.

Dependencies are inferred from the claim text.