Stippled substrate for pressed battery plates

Claim 1

An electrolytic cell having a casing; a plurality of alternating positive and negative plates in said casing, at least one of said plates comprising a. a thin conductive sheet with opposed major surfaces and having continuous uninterrupted edges, b. an array of spaced perforations extending through said sheet, intermediate said uninterrupted edges, c. an array of continuous, relatively smooth, closely spaced bosses in said sheet intermediate said edges and said perforations, each said boss comprised of a projection extending from one of said said surfaces, said bosses in said array forming a pattern of alternating projections and recesses in each said surface intermediate said edges and intermediate said perforations, said bosses and said perforation being dimensioned at said surfaces such that the ratio of the cross-sectional dimensions of said perforations to said bosses is substantially greater than 1, d. a paste comprised of a binder and active material substantially covering said surfaces between said edges and extending through said perforations; a separator disposed between said positive and negative plates; and an electrolyte in said casing.