Improved Plates for Secondary Galvanic Batteries, and a Method of Producing the same.
Year: 1896

page_text: Date of Application, 4th June, 1896
Complete Specification Left, 3rd Sept., 1896-Accepted, 24th Oct., 1896
PROVISIONAL SPECIFICATION.
Improved Plates for Secondary Galvanic Batteries, and a Method of
Producing the same.
I, CARL MARSCHNER of 1 Winterfeldtstrasse, Berlin, W., in the Empire of
Germany, Manufacturer, do hereby declare the nature of this invention to be as-
follows:-
This invention relates to plates for secondary galvanic batteries and to a method
of producing the same, the essential feature of the invention being the use of a new
agent for binding the active material.
The binding agent consists of a solution of amber or similar fossil resin, which is
added to the mass (minium or the like) serving to produce the plates. In order to
transform the amber into a liquid state a solvent, appropriate for this
purpose, for
example alcohol, or a mixture of turpentine oil and alcohol, or the like, is employed.
A sufficient quantity of this solution is added to the lead-oxide to form a plastic pulp-
which, for producing the plates is transferred into a suitable leaden frame. The
mass thus produced possesses such effective binding qualities that it is not necessary
to have recourse to fixing the mass by pressing the same, as is the case with
other methods; on the contrary, according to this improved method, the mass,.
after having been introduced into the frame, is simply flattened. The plates thus
obtained are dried, subsequently acidulated for some days in a bath of dilute,
sulphuric acid, and finally brought into proper shape. The process of shaping the
plates occupies considerably less time than that employed for producing accumulators.
in conformity with hitherto known methods.
The advantages derived from plates produced according to this improved process.
are principally the following:
They are considerably lighter than those formed by using lead trellis. They
have the further advantage of offering great resistance to concussions, and are
therefore especially suitable for use in tram-cars or the like. They further insure
a considerable output and possess great capacity.
Dated this 4th day of June 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improved Plates for Secondary Galvanic Batteries, and a Method of
Producing the same.
I, CARL MARSCHNER of 1 Winterfeldtstrasse, Berlin, W., in the Empire of
Germany, Manufacturer, 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 a method of producing plate shaped electrodes; for
electric accumulators and consists in the use of a certain binding agent, not hereto-
fore used for this purpose, and serving as an additional substance of the active

page_text: mass, whereby the latter is rendered so rigid that the usual leaden trellis work may
be replaced by simple leaden frames.
Many attempts have heretofore been made to employ such plate shaped electrodes
without leaden trellis work, known by the name of "mass-plates," binding agents,
such as the residues from the distillation of tar, resin of trees, india rubber and the
like having been added in order to obtain the required rigidity; the result
has not, however, been satisfactory, because the binding agents soon become
decomposed by the current, leaving behind a brittle substance. Moreover,
especially when gum-resin is employed, the conductive capacity of the mass is
considerably reduced and the formation rendered difficult.
Now the present invention consists in the use of amber or other fossil resins
serving as agents for binding the active mass consisting of lead-oxides, minium and
the like. The amber is dissolved in. alcohol a mixture of turpentine oil and
alcohol, other suitable solvent and is then mixed with the preferably heated
solution of the lead-oxides and the like, until a plastic pulp is obtained. This pulp
is then spread out in a suitable frame of hard lead. The binding capacity of the
mass is so efficient that it does not require to be pressed into said frame. The plates
thus obtained are then dried at a moderate temperature, then acidulated for a few
days in a bath of dilute sulphuric acid and finally shaped and arranged.
The plates thus formed and known by the name of "mass-plates" have the
advantage of being very light in comparison to those plates, in which a leaden
trellis-work is employed. They are further distinguished by their great solidity and
elastic resistance against concussions, which fact renders them especially suitable in
use for driving tramway vehicles and the like. They morcover insure a considerable
output and possess great capacity.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what 1
.claim is :-
An improved method of producing plate shaped electrodes for secondary galvanic
batteries, the essential feature consisting in the use of amber or other fossil resins
as binding agents for the active mass.
Dated this 3rd day of September 1896
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.