Manufacture of battery plates
AssigneeChloride Group Limited
InventorStanley Charles Foulkes
Life of this patent
Estimating the term…
Abstract
There is disclosed a method for preparing enveloped plates for batteries by introducing an active material composition containing liquids into the porous envelope of the plate, when the envelope is assembled on the current conducting element of the plate using an active material composition with a liquid content such that active material is filtered out by the porous envelope, and a bed of active material is built up in the envelope, the bed building up from the end remote from that at which the composition is introduced back to the end at which the composition is introduced, liquid issuing through the walls of the envelope throughout the period that the bed is being built up. A variety of suitable active material compositions are described together with apparatus suitable for carrying out the method.
Claims30
A method for preparing enveloped plates for batteries by introducing an active material composition containing liquids into the porous envelope of the plate, when the envelope is assembled on the current conducting element of the plate, characterized in that the active material of the composition is introduced into the envelope as an aqueous slurry, comprising a lead acid active material composition, which has a rotating vane viscometer torque value of less than 0.006 lbs. ft. at 20.degree. C., said aqueous slurry being introduced into the envelope at a pressure of less than 5 p.s.i. until the envelope is filled with the composition, liquid issuing through the walls of the envelope, the pressure then being allowed to rise to a value above 5 p.s.i. but not in excess of 100 p.s.i. whereafter the pressure is released.
A method for filling enveloped plates for batteries which comprises introducing an active material composition into the porous envelope of the plate when the envelope is assembled on the current conducting element of the plate, characterized in that the active material composition is introduced into the envelope as an aqueous slurry, comprising a lead acid active material composition, which has a rotating vane viscometer torque value of less than 0.006 lbs. ft. at 20.degree. C., said aqueous slurry being introduced into the envelope at a pressure of less than 5 p.s.i. until the envelope is filled with the composition, liquid issuing through the walls of the envelope, the pressure then being allowed to rise to a value above 5 p.s.i. but not in excess of 100 p.s.i. whereafter the pressure is released;
- wherein the envelope is disposed in a substantially vertical plane so that solids can settle to the bottom of the envelope under gravity, the aqueous slurry containing a ratio of active material to water in the range 0.4 :
- 1 to 2.5 :
- 1 in parts by weight, the material of the envelope being selected to filter out active material whilst allowing passage of liquids;
- the solids being at least partially retained within the envelope and the liquids at least partially passing out through the walls of the envelope.
Dependencies are inferred from the claim text.