Improvements in Secondary Batteries or Electric Accumulators.
Year: 1898

page_text: Date of Application, 1st June, 1898
Complete Specification Left, 30th Jan., 1899-Accepted, 4th Mar., 1899
Improvements in Secondary Batteries or Electric Accumulators.
I, FRANK KING, of 4, Great Winchester Street, in the City of London, Engineer,
do hereby declare the nature of this invention to be as follows:
1
The object of my invention is to increase the surface of the active material
or material to be rendered active of a given size plate or element of the type
generally known as a pasted plate. According to my invention I form on the
surface or surfaces of the pellets or other form of active material or material
to be rendered active a number of projections preferably consisting of juxta-
posed pyramids whose sides preferably form equi-lateral triangles as this form
I find gives the best results as regards increase of surface and coherence of the
material. The projections may be formed by dies provided with recesses corre-
sponding to the projections to be formed and pressed into the material whilst it
is in a plastic condition.
1
J
T
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
I, FRANK KING, of 4, Great Winchester Street, in the City of London, 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:-
The object of my invention is to increase the surface of the active material
or material to be rendered active, of a given size plate, or element, of the type
generally known as a pasted plate. According to my invention I form on the
surface, or surfaces, of the pellets, or other form of active material, or material
to be rendered active, a number of projections, consisting of juxta-posed pyramids
whose sides, preferably form equi-lateral triangles, as this form, I find, gives
the best results as regards increase of surface, coherence of the material, durability
of form and prevention of short circuits, the pyramidal form of the projections
causing any scale which forms, to be broken up and rendered harmless. The
said pyramidal projections may be formed by dies provided with recesses corre-
sponding to the projections to be formed and pressed into the material whilst it
is in a plastic condition.

page_text: I illustrate in the accompanying drawing, parts of grids with my invention
applied thereto but my invention can be applied to all secondary battery plates,
or elements in which the active material is applied or attached to the grid or
support by pasting or mechanical means.
Figure 1 shews in section part of a plate, or element, in which the tops of the
pyramidal projections c in the active material or paste, B, are level with the
surface or edges c of the grid, or support, A. Figure 2 shews in section part of
a plate, or element, in which the pyramidal projections c of the active material
or paste B, are above the surface, or edges, of the grid, or support, A. Figure 3
is a face view of Figure 2 the projections being in the form of juxta-posed
pyramids with equi-lateral sides which is the form of pyramids I prefer although
I do not restrict myself to this particular form of the pyramids.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
In, or for, secondary batteries, or electrical accumulators, elements having
formed of, and from, the active material or paste numerous, and juxta-posed
pyramidal projections as hereinbefore explained & illustrated.
Dated this 30th day of January 1899.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.