Method for producing, maturing and drying negative and positive plates for lead accumulators

Abstract

A method for producing, maturing and drying negative and positive plates for lead accumulators during which, in a pasting step, the plates are manufactured by introducing lead paste serving as an active material into an electrode support. The plates are directly placed one atop the other in stacks; the plates are matured at temperatures higher than 70° C. while maintaining a residual moisture of the active material, which prevents or reduces a spontaneous oxidation of the lead oxides, to form a porous cross-linked structure comprised of 3- and/or 4-basic lead sulfates, the 3- and/or 4-basic lead sulfates having a greater density than that of the active material that forms the starting material, and; the plates are dried to a desired final moisture while exploiting a permeability, which is suited for the active material due to the porosity resulting from the maturing, and the oxidation of lead remaining in the active material in the plate stack by applying an overpressure or underpressure, which has a pressure difference of more than 10 mbar between an inflow side and an outflow side of the plate stack, by means of oxygen-containing gas flowing through the active material.