Improvements in and in the Manufacture of Electrode Plates for Electric Accumulators.
Year: 1899

page_text: Bate of Application, 19th Jan., 1899-Accepted, 25th Feb., 1899
COMPLETE SPECIFICATION.
Improvements in and in the Manufacture of Electrode Plates for
Electric Accumulators.
A communication by THE ACCUMULATOREN AND ELEKTRICITÄTS-WERKE A. G.
VORM, W. A. BOESE & Co., of 154, Köpenickerstrasse, Berlin, in the Empire
of Germany, Manufacturers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of War-
wick, and 322, High Holborn, in the County of Middlesex, Civil 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:
This invention relates to electrode plates for electric accumulators having as
large a lead surface, as possible and a very effective arrangement of the active
mass or paste with a good circulation of the electrolyte. Further the present
invention relates to a mould for casting these improved plates.
The object of the application is shown in the accompanying drawings,
Figure 1 being an elevation of the improved grid or latticed plate;
Figure 2, a section on the line a-b of Figure 1;
Figure 3, a section on the line c-d of Figure 1;
Figures 4 and 5 are sections of the electrode plates corresponding to Figures 2
and 3 after the active mass or paste has been applied thereto or spread thereon;
Figure 6 is a vertical section of the casting mould;
Figures 7 and 8 show the two side plates of the casting mould which engage
one another;
Figure 9, a section on the line e-f of Figure 7;
Figure 10, a section on the line g-h of Figure 8;
Figures 11, 12 and 13 are various modifications in the form of the electrode
plate.
The basic idea of this improved electrode plate consists in a large number of
small flat formations having a triangular shape being arranged in layers alter-
nately one on the other in such a way that the points of one layer correspond to
the bases of the two adjacent layers. These electrode plates are not however
made by arranging the separate formations upon and opposite one another in layers,
but by casting.
In the form of construction shown in Figures 1-5 in which the formations
represent equilateral triangles i, the latter are laid side by side in such a way that
the point of one triangle points to the base of the triangle lying next to it. Rows
formed in this way are arranged one above the other in a frame k. By the arrange-
ment side by side of the triangles i herein before mentioned the result is attained
that not only their points but also their bases are kept apart so that the active
mass passes in the manner shown in Figures 4 and 5 from one side to the other.

page_text: Further in consequence of this arrangement solid bars are formed passing through
from one side of the framework to the other completely. These solid bars, which
in cross section have the form of an elongated rhombus, are provided with pro-
jections or lugs on both sides which alternately according to the triangular form
widen outwardly on the one side and on the other side run taper outwardly to a
point. Between these flaps the active mass is placed. As may be seen from
Figures 4 and 5, the active mass also forms bars which pass from one side of the
frame to the other, and on which also projections are formed when the active mass
is spread between the formations i.
In the manner hereinbefore described a grid or latticed plate is thus obtained
which has a very large surface and is also equally suitable for forming according
to the Planté or Faure system. The plate hereinbefore described is however
especially suitable for the purpose of being arranged according to the formation of
Faure and later during the period of working being also utilised according to
Planté. If after a long period of working the, active mass becomes loose and partly
falls out, the lead grid or latticed plate of larger surface which has been formed
in the meantime with it can be further utilised by Planté's method without a
deleterious change being observable in the capacity of the, plates. The separate
parts of the latticed plates are so connected that on the one hand a thoroughly
reliable stability and on the other hand a, good circulation of the electrolyte is
attained.
The grid or latticed plate shown in Figures 1-5 is cast in the moulding box
or mould shown in Figures 6-10. This mould, consists of two bed-plates / and m
which are set with prismatic bodies in the manner shown in the drawing which
correspond in turn to the above mentioned formations and engage one with
another in the manner shown in Figure 6. In order to form the framework k,
two frames and are preferably employed placed between the bedplates and m
and provided with an opening o. These two frames p and q may be arranged as
jaws for fixing or holding fast and retaining the cast latticed plate in the ordinary
manner.
In Figure 11 another form of construction of the improved electrode plate is
shown in which the formation has the shape of a triangle with a truncated point
and the truncations accordingly only partially overlap one another.
In Figure 12 an electrode plate is shown in which the formation has the form
of a triangle, the height of which is less than the thickness of the plate.
In Figure 13 an electrode plate is shown which is cast by means of the mould
shown in Figures 6-10 after the two frames p and q have been replaced by
similar ones of somewhat greater thickness.
In the forms of construction shown in Figures 11-13 elongated strips result
in an easily comprehensible manner which lie displaced against one another on
both sides of the plates and firmly connected with one another by the solid lead bars.
Of course the forms of construction of this improved electrode plate may be
modified in various ways without altering the essential features of the present
invention.
Having now particularly described and ascertained the nature, of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. Electrode plates for electric accumulators, characterized by a large number
of small flat formations having a triangular shape being placed alternately with
their flat sides to one another in such a way that the points which in some cases
may be truncated correspond to a similar position of the bases of the next layer
and when placed side by side yield a latticed work or grid of large surface com-
posed of several columns thus formed and perforated in an oblique direction so that
solid bars pass through from one side of the frame to the opposite one, both in the
latticed work and also in the active mass after it has been spread over said latticed
work, substantially as hereinbefore set forth.

page_text: 2. A mould for forming the accumulator plates hereinbefore described in which
both bed plates (l and m) are provided alternately with projections (¹) correspond-
ing to the herein before mentioned flat formations (i 2 ) and are adapted to engage
in one another after frames (p & g) have been inserted between them, the thickness
of which frames may also be greater than the height of the projections (¹), sub-
stantially as hereinbefore described.
Dated th 10th day of Januar 1899
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.