Alkaline storage battery and method for producing the same

Abstract

The separator 10a for use in the alkaline storage battery of the invention comprises densely and uniformly formed over the entire separator and entrained from the surface to the back plane of the separator, first fine paths (pores) 15 rendered hydrophilic and second fine paths (pores) 16 rendered non-hydrophilic. In this manner, the gas generated in the vicinity of the first fine paths (pores) 15 can immediately reach the second fine paths (pores) 16 formed in the vicinity of the first fine paths (pores) 15 and transferred. On the other hand, the ions that attempt passing through the second fine paths (pores) 16 can readily reach the first fine paths (pores) 15 formed in the vicinity of the second fine paths (pores) 16, and hence, the ions can be transferred through the first fine paths (pores) 15. Thus, it is provided an alkaline storage battery improved in utilization factor of the active material and yet having suppressed in the increase of internal pressure of the cell, by obtaining a film separator having excellent ion permeability and gas permeability, in which hydrophilic portions and non-hydrophilic portions densely and uniformly formed over the entire separator.

Dependencies are inferred from the claim text.