provements in the Manufacture and Production of Electrodes for Secondary Batteries.
Year: 1898

page_text: Date of Application, 8th Mar., 1898.
Complete Specifinstion Loft 30th Nov 1898-Accented 14th Jan
1899
PROVIDIUNAL DIECIFICATION
Improvements in the Manufacture and Production of Electrodes for
Secondary Batteries.
I, HENRI PIEPER, Fils, of Rue de Bajards, Liege, in the Kingdom of Belgium,
Electrician, do hereby declare the nature of this invention to be as follows;
This invention relates to the manufacture of that description of electrodes for
secondary batteries in which the so-called active material is placed in dovetail
grooves or channels formed in, or upon, a solid lead back or support of hollow
cylindrical shape, and it consists in an improved process of manufacture by which
the making of such electrodes is greatly facilitated and, moreover, a more per-
fect contact is obtained between the active material and its support, by a com-
pressing action exerted through the medium of the groove-walls as will be
hereinafter described.
According to my invention I form a flat plate out of lead by casting or rolling
in such a manner that one side of the plate provided with parallel and prefer-
ably equi-distant straight or curved ribs, ridges or the like projections extending
from end to end and standing at a right angle to the plane of the plate. Thus
the plate presents a number of flutes, grooves, channels or the like extended
depressions having a rectangular section. I fill these flutes or grooves or the like
with the active material or the material to be rendered active, as for example,
lead compounds, or finely powdered metallic lead, made into a paste as is well
known to those skilled in the art. Then I bend the plate so prepared into the
shape of a hollow cylinder with its ribs, ridges or the like directed inwardly and
parallel to the axis of the cylinder to be formed. Finally the longitudinal edges
of the bent plate are joined to each other, preferably by soldering, and the cylinder
is provided with a metal strip preferably of lead constituting the terminal of
the electrode.
By bending the plate as described the ribs, ridges or the like, containing be-
tween them the paste, become inclined towards each other or directed radially,
that is to say, their relative position to each other is so altered that their pro-
longations would finally intersect one another in the axis of the hollow cylinder
so formed. Consequently the rectangular section of the flutes or grooves or the
like is transformed into a dovetail section, and as the flutes or grooves or the
like are filled with paste, this sectional transformation causes the ridges or ribs
to exert a compressing action upon the paste, whereby a more intimate contact
between the paste and the enclosing lead walls is established and the corners
become tightly fitted up.
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: Improvements in the Manufacture and Production of Electrodes for
Secondary Eatteries.
I, HENRI PIEPER, Fils, of Rue de Bajards, Liege, in the Kingdom of Belgium,
Electrician, 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 the manufacture of that description of electrodes for
secondary batteries in which the so-called active material is placed in dovetail
grooves or channels formed in, or upon, a solid lead back or support of hollow
cylindrical shape, and it consists in an improved process of manufacture by which
the making of such electrodes is greatly facilitated and, moreover, a more per-
fect contact is obtained between the active material and its support, by a com-
pressing action exerted through the medium of the groove walls as will be
hereinafter described.
According to my invention I form a flat plate out of lead by casting ar rolling
in such a manner that one side of the plate is provided with parallel and prefer-
ably equi-distant straight or curved ribs, ridges or the like projections extending
from end to end and standing at a right angle to the plane of the plate. Thus
the plate presents a number of flutes, grooves, channels or the like cxtended
depressions having a rectangular section. I fill these flutes or grooves or the like
with the active material or the material to be rendered active, as for example,
lead compounds, or finely powdered metallic lead, made into a paste as is well
known to those skilled in the art. Then I bend the plate so prepared into the
shape of a hollow cylinder with its ribs, ridges or the like directed inwardly and
parallel to the axis of the cylinder to be formed. Finally the longitudinal edges
of the bent plate are joined to each other, preferably by soldering, and the cylinder
is provided with a metal strip preferably of lead constituting the terminal of
the electrode.
By bending the plate as described the ribs, ridges or the like, containing be-
tween them the paste, become inclined towards each other or directed radially,
that is to say, their relative position to each other is so altered that their pro-
longations would finally intersect one another in the axis of the hollow cylinder
so formed. Consequently the rectangular section of the flutes or grooves or the
like is transformed into a dovetail section, and as the flutes or grooves or the
like are filled with paste, this sectional transformation causes the ridges or ribs
to exert a compressing action upon the paste, whereby a more intimate contact
between the paste and the enclosing lead walls is established and the corners
become tightly fitted up.
And in order that my invention may be fully understood, I have annexed
two sheets of drawings showing the plate at several stages of the process, the
grooves being shown as formed by straight ribs.
Fig. 1 is an elevation of the plate in its flat or unbent state, and Fig. 2 an
end elevation of such plate with the paste applied.
Figs. 3 and 4 are end views showing the plate as it represents itself in the
middle and end phases of the bending step.
Fig. 5 is a perspective view of the finished hollow cylinder of which a portion
is broken away to show its inner side, the paste being omitted for clearness sake.
Referring to these figures E is the lead plate or support for the active material
or material to be rendered active. On one side the plate is provided with
parallel and equi-distant straight ribs or ridges a whereby a number of grooves

page_text: or flutes 6 is formed for the reception of the said material. As is clearly to be
seen from Fig. 2, the plate is so produced by casting or rolling that the ribs or
ridges stand at a right angle to the plane of the plate, so that the grooves or
flutes present a rectangular section. With this section they are filled with the
paste consisting of active material or material to be rendered active, said paste
being indicated by the reference letter c. Fig. 3 shows clearly how in the act of
bending the plate with the pasted side as the inner side, the rectangular section
of the grooves is gradually transformed into a dovetail section, whereby the sec-
tional area of the groove is diminished and the walls of the latter are caused to
compress the paste. d indicates a lead strip soldered to the outer side of the upper
portion of the cylinder, said strip constituting the passage for the current to be
supplied to, or conducted away from, the electrode.
I am aware that it is known to produce hollow cylindrical electrodes by casting
so as to present grooves or flutes of dovetail-section; hence I do not claim such
electrodes or their casting broadly but
Having now particularly described the nature of my said invention, and in
what manner the same is to be performed, I declare that what I claim is;-
The process for manufacturing hollow cylindrical electrodes for secondary
batteries which essentially consists in producing a flat lead plate with projections
extending from end to end and standing at a right angle to the plane of the plate,
filling the interstices between said projections with the paste, and bending the
plate into the shape of a hollow cylinder with the projections directed inward and
parallel to the axis of the cylinder to be formed, substantially as and for the pur-
pose stated.
Dated this 30th day of November 1898.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C.,
Agents.