An Improvement in Active Material for Secondary Voltaic Batteries.
Year: 1896

page_text: Date of Application, 15th May, 1896
Complete Specification Left, 12th Feb., 1897-Accepted, 27th Mar., 1897
PROVISIONAL SPECIFICATION.
An Improvement in Active Material for Secondary Voltaic
Batteries.
I, GEORGE ANNESLEY GRINDLE, of Addiscombe, Prestwich, in the County of
Lancaster, Electrical Engineer, do hereby declare the nature of this invention to
be as follows:-
In many secondary voltaic batteries the active material consists of lead in sheets
strips, rods or other forms sometimes corrugated, folded, rolled up or otherwise
treated so as to present large surface in moderate compass.
When material of this kind has been used for some time it becomes more or less
disintegrated so that the conduction throughout the material and to or from the
frame which carries it often becomes seriously defective, the efficiency of the
battery being thus greatly lessened.
My invention relates to means of remedying this defect, for which purpose
instead of employing sheets strips rods or other pieces of simple lead, I compound
them of pure lead with a backing or core consisting of lead alloyed with antimony
which does not readily become disintegrated.
For preparing these composite sheets strips, or pieces any known process may
be employed.
A convenient method is the following. I force into a suitable mould simul-
taneously from two nozzles molten lead and the molten alloy, the nozzles having
such relative dimensions as to proportion as desired the thickness of the two
layers. Or molten alloy might be poured on the surface of a lead plate or into a
hollow cored in a lead bar, the heat of the alloy being such as to ensure intimate
union or as it were welding of the alloy to the lead.
Composite bars or slabs thus produced can then be rolled down to the desired
thickness.
Dated this 15th day of May 1896.
ABEL & IMRAY,
Agents for the Applicant.
An Improvement in Active Material for Secondary Voltaic
Batteries.
I, GEORGE ANNESLEY GRINDLE, of Addiscombe, Prestwich, in the County of
Lancaster, Electrical Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
In many secondary voltaic batteries the active material consists of lead in sheets
strips, rods or other forms, sometimes corrugated, folded, rolled up or otherwise
treated so as to present large surface in moderate compass.

page_text: When material of this kind has been used for some time it becomes more or less
disintegrated so that the conduction throughout the material and to or from the
frame which carries it often becomes seriously defective, the efficiency of the
battery being thus greatly lessened.
My invention relates to means of remedying this defect, for which purpose,
instead of employing sheets, strips, rods, or other pieces of simple lead, I compound
them of pure lead with a backing or core consisting of lead alloyed with antimony
which alloy does not readily become disintegrated.
For preparing these composite sheets, strips or pieces, any known process may
be employed.
A convenient method is the following: I force into a suitable mould simul-
taneously from two nozzles molten lead and the molten alloy, the nozzles having
such relative dimensions as to proportion as desired the thickness of the two layers.
Or molten alloy might be poured on the surface of a lead plate or into a hollow
core in a lead bar, the heat of the alloy being such as to ensure intimate union or,
as it were, welding of the alloy to the lead.
According to another method, a core of the alloy preferably heated is placed
vertically in a vessel provided at the bottom with a suitable nozzle. Melted lead
poured into the annular space surrounding the core, descends through the nozzle
along with a proportion of the alloy which the lead envelopes.
Composite bars or slabs thus produced can then be rolled down to the desired
thickness, or rods can be drawn down.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Active material for secondary voltaic batteries in form of strips, sheets, rods or
other pieces of composite metal each consisting of a layer of lead and a layer
or core of alloy of lead and antimony substantially as and for the purpose set
forth.
Dated this 12th day of February 1897
ABEL & IMRAY,
Agents for the Applicant.