Improvements in Secondary Batteries.
Year: 1893

page_text: The decision of the Comptroller-General, of the 31st day of July 1895, allowed,
under Section 18 of the Patents, &c. Act, 1883, an Amendment of this
Date of Application, 30th Mar., 1893
Complete Specification Left, 30th Dec., 1893-Accepted, 24th Mar., 1894
Improvements in Secondary Batteries.
I, VILLEROY CORNEY DOUBLEDAY of 37 Walbrook, in the City of London,
Accountant, do hereby declare the nature of this invention (a communication to me
from abroad by Max Sussmann of Neuruppin, Germany, Electrician) to be as
follows:-
The active material made according to this invention and used in connection with
a suitable lead conductor to form a "plate" is very porous while firmly adhering
to the conductor. The material I use for making my plate is in the condition of a
very fine powder. This material may be metallic, lead or lead oxide or any other
salt of lead or other suitable metal or metallic salt. This powdered material I mix
intimately with a solution of gutta percha or of india rubber, the solvent employed
being a volatile hydrocarbon, sulphide of carbon or the like the solution being
This composition forms the active
mixed with very finely powdered pumice stone.
material which I apply to both sides of a lead conductor having apertures through
it whereby the active material is well keyed together and I then strongly compress
it. In one form of conductor I employ sheet lead of any desired thickness and rip it
up that is to say provide it with small incisions and then by means of suitable
tools push out the pieces in opposite directions so that the two surfaces of the lead
sheet are formed with teeth hookshaped or not.
In and on this conductor provided with teeth and openings I apply the "active
material" composition in a thickness somewhat exceeding the height of the teeth.
The whole is then strongly compressed in a suitable mould thus forming a
homogeneous block of active material composition with interior conductor, the
whole firmly held together, and the teeth of the conductor not only serving to grip
In case a salt
and hold the active material composition but also forming an extended conducting
surface. The solvent having evaporated the plate is ready for use.
of lead is used for the active material composition the plate made as described is
plunged into a suitable bath to reduce the lead salt into metallic spongy lead.
The aforesaid active material composition and mode of making plates is also
applicable to grid shaped or open-worked conductors of a great variety of forms
existing and otherwise."
Plates thus made are very light and strong and possess the special advantage
that they can be charged and discharged at a very high rate.
04.
1002
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.

page_text: I, VILLEROY CORNEY DOUBLEDAY of 37 Walbrook in the City of London,
Accountant do hereby declare the nature of this invention (a communication from
Max Sussmann of Neuruppin, Germany, Electrician) and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
The active material made according to this invention and used in connection with
a suitable lead conductor to form a "plate" is very porous while firmly adhering
to the conductor.
The material I use for making up the plate is in the condition of a very fine
powder. This material may be metallic lead or lead oxide or any other salt of lead
or other suitable metal or metallic salt. This powdered material I mix intimately
with a solution of gutta percha or of india rubber so as to form a thick paste, the
solvent employed being a volatile hydrocarbon, sulphide of carbon or the like the
solution being mixed with very finely powdered pumice stone or other suitable inert
porous material, say about 5 to 15 per cent. of the bulk of the composition. The
pumice stone imparts a beneficial porosity to the compound. The compound so
made forms the active material in the paste condition ready for application. It is
applied to both sides of a lead conductor by preference provided with apertures
through it whereby the active material on both sides is well keyed together, and
I then compress it.
In one form of conductor I employ sheet lead or other suitable material of any
desired thickness and rip it up that is to say provide it with small incisions and
then by means of suitable tools push out the pieces in opposite direction so that the
two surfaces of the article are formed with teeth or tongues, triangular, rectangular
or other suitable form and bent into hook shape or not.
Fig. 1 is a part sectional side view of a plate with such a conductor and Fig. 2. a
part sectional plan view of same.
1 have here shewn as examples two modes of arranging the triangular teeth or
tongues and one form of square teeth. The teeth or tongues a may as shewn be merely
bent up from the body of the conductor or bent up and curved. The active
materiale is applied to both sides of the conductor by preference in a thickness
somewhat exceeding the height of the teeth. The whole is then compressed in a
suitable mould, so that the active material comes about level with the upstanding
edges d surrounding body of the conductor on both sides, the whole of the active
material e forming a homogeneous block. The teeth or tongues a not only serve to
grip and hold the material c together but also forin an extended conducting surface
distributed throughout the mass of the material, those portious of the latter which
are in the holes e forming keys that bind the material on both sides of the
conductor together and allowing the exciting liquid to penetrate. A "plate" of
this construction not only contains a large amount of active material but the
conductor also presents a large active surface, while the material is well kept in
place. It thus possesses great superiority to the plates with gridiron form of
conductor where the material is much less in quantity and the conductor while large
in bulk presents a comparatively small surface.
Plates made according to this invention are moreover very light and strong
and possess the special advantage that they can be charged and discharged at a very
high rate.
The solvent having evaporated the plate is ready for use.
In case a salt of lead is used for the active material composition the plate made
as described is plunged into a suitable bath to reduce the lead salt into metallic
spongy lead.

page_text: "
are also
The aforesaid active material composition and mode of making "plates
applicable to grid shaped or openworked conductors of a great variety of forms,
existing and otherwise.
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 I
claim is :-
--
1. Active material for secondary batteries made of finely powdered lead, lead
oxide or salt of lead in combination with inert porous material such as pumice
stone or the like and with binding material such as dissolved india rubber, or gutta
percha or the like, substantially as described.
2. A conductor for a secondary battery plate consisting of a body 6 of lead or
other suitable material with upstanding edges d and teeth or tongues a projecting
on each side and holes e substantially as and for the purposes set forth.
3. A secondary battery plate consisting of a conductor made as secondly claimed
and active material as firstly claimed applied to the sides and filling the holes in
the conductor and compressed substantially as set forth.
Dated this 30th day of December 1893.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.