Patent ID: 8101299
Filing Date: 2012-01-24
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A method for producing, maturing and drying negative and positive plates for lead accumulators, comprising the steps: initially, producing the plates by bringing lead paste, comprising lead oxide, water and sulfuric acid, as an active composition, into an electrode support in a pasting step, disposing the plates in direct contact with one another in stacks, maturing the plates at temperatures above 70° C. into a porous, cross linked structure of at least one of tribasic and tetrabasic lead sulfates, while maintaining a residual moisture content of the active composition to reduce a spontaneous oxidation of the lead oxides, utilizing a permeability of the active composition resulting from the porosity that developed during the maturing step and utilizing an exothermic oxidation of residual lead in the active composition in the stack of plates for producing at least a portion of a drying heat, by applying one of a pressure or vacuum, which has a pressure difference of more than 10 mbar between an inflow side and an outflow side of the stack of plates which is sealed from the inflow side, to result in a flow of an oxygen-containing gas through the plates, drying the plates by means of the oxygen-containing gas flowing through the plates comprised of active composition, to a desired final moisture content, at a drying rate which reduces shrinkage of the plates.