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Патент USA US2107937

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2,107,937
Patented Feb. 8, i938
UNITED STATES‘
PATENT
OFFICE ’
‘ 2,107,937
METHOD OF MAKING STORAGE BATTERY
'
PLATES
Clarence A. Hall, Philadelphia, Pa., assignor to'
The Electric Storage Battery Company, Phila
delphia, .Pa., a corporation of New Jersey
No Drawing. Application May 29, 1935,
Serial No. 24,082
2 Claims. (01. 136-27)
It has been proposed in the past to mix with stiffens the paste, the production of sandy glass
the active material or material to become active particles is avoided, and the glass ?bers of small
of a storage battery plate ?brous materials of but substantial length are uniformly incorporated
and the surface of the plate after the completion
various kinds for the purpose of holding the ma
6 terial together and in order to avoid scaling or of the pasting operation is practically as smooth
disintegration thereof in service. Glass wool has as that of a plate containing no glass wool.
Based on the above discoveries the invention,
been suggested but attempts to use it have been
unsuccessful. I have found that in attempting generally stated, consists of a storage battery
to mix ordinary commercial glass wool of 25 to 30 plate of the lead acid type having a smooth sur
microns diameter, it broke up into very short face ?nish and substantially devoid of glass dust 10
or sand, and comprising a grid and a paste sub
, lengths. The lengths were too short in propor
tion to the diameter to function properly as a stantially ?lling the pockets of the grid and con
binding agent. Fibers of greater lengths could
sisting of a uniform mixture of active material
not be properly applied to the grid because the - or material to become active and of a small per
15 glass ?bers projected beyond the surface of the centage by weight of glass ?bers of the order of 15
plate and in some cases overlapped the bars of 4 to 6 microns in diameter and of a length com
the grid, making it impossible to provide a smooth mensurate with the dimensions of the pockets in
the grid.
?nish. Furthermore, the projecting ?bers in
The invention also consists in introducing glass
?icted injury to the hands of workmen. On ac
?bers
into the active material or material to be 20
count
of
the
large
diameter
of
the
glass
?bers,
20
come active by primarily making a water paste of
they displaced more active material than was de
sirable. Hitherto the glass wool was cut into lead oxides of soupy consistency, mixing with
said paste glass ?bers in long lengths many times
short lengths commensurate with the space be
tween the bars of the grid, and these short lengths the dimensions of the pockets of the grid and,
25 were mixed with the lead oxides in a dry state. while the ?bers are water wet, adding to the paste
The result was that the glass was broken up into a solution of sulphuric acid and water, which
small particles of sandy structure, thereby losing stiiiens the paste, and, by stirring, uniformly dis
tributing the ?bers and breaking them up, with
its binding e?ect.
Objects of the present invention are to avoid out substantial formation of sandy particles, into
30 the above-mentioned defects and disadvantages lengths suitable for pasting the grids.
The invention also comprises the improvements
and to bind the active material together with glass
?ber in such a way that the plates shall present to be presently described and ?nally claimed.
A plate embodying features of the invention
smooth surfaces and shall be devoid of sandy
particles of glass and shall be satisfactorily bound looks like a standard plate. It has a smooth
?nish and can be handled like an ordinary plate LI
35 by uniformly distributed ?bers, displacing a lim
because it is devoid of needle-like projecting
ited quantity of active material.
In explanation of the difference between the ?bers. It can be pasted without pulling off paste
so-called glass silk which I employ in carrying because the ?bers are reduced to vproper length in
out this invention and the commercial glass wool the described mixing operation. The ?bers are
40 heretofore unsuccessfully tried, it may be stated well distributed throughout the paste in the pock
that the minimum diameter of the glass wool ets of the grid. The capacity of the plate is not
?bers is many times the maximum diameter of reduced but rather is increased as are also du
rability and cohesion. More important than all,
the glass silk ?bers.
This invention is based on the .discovery that, the active material is not dislodged in service.
45 by using glass wool of the order of from 5 to 6 The improvement is particularly marked in the
microns in diameter and by introducing it in long initial formation of the plates, where in the
case of previous attempts to use glass ?bers scal
lengths, illustratively measured infeet, it is possi
ble to uniformly distribute ?bers of which the ing occurred, whereas in the case of this invention
ratio of length to diameter is increased in the
no scaling occurred under the same conditions
order of many times that formerly obtainable.
The invention is based on the furtherdiscovery
of forming schedule.
of lead oxides, whereby the fibers are wet with
In the practice of the invention use is made of
glass wool ?ber of the order of from 5 to 6 mi
crons in diameter and of considerable length
even measurable in feet. Such glass ?bers are
55 water, and then adding sulphuric acid which
introduced in their full length into a primarily
that, by introducing such long lengths of small
- diameter glass ?bers into a soupy water mixture
50
2,107,937
made mixture or paste or lead oxide material
and water, oi’ soupy consistency, by mixing the
?bers into this paste. The ?bers become wet with
water and partly separated. There is then in
troduced into the paste containing the ?bers‘ a
solution of sulphuric acid in water, for example
a speci?c gravity 01' approximately 1.400. The
effect 01' this is to sti?en the paste into a dough
like consistency. The acid is added while the
10 mixture is being stirred and the subsequent stir
ring and gradual sti?ening in a few minutes
breaks up the long ?bers of glass into lengths
suitable for pasting the grids and practically no
sandy material is produced from the ?bers. An
16 example of the length into which the ?bers are
broken by this operation is an eighth ($6) of an
inch more or less. The proportion of glass ?bers
to lead oxide material is subject to some varia
tion, but I have had good results by using 1%
20 by weight oi’ glass ?bers.
The length of the glass ?bers in the ?nal prod
uct is determined by the time oi! mixing after
the sulphuric acid has been added to the paste.
The longer this mixing is continued, the shorter
will be the ?bers; The control of this mixing
time is therefore an important feature of the
process.
It will be obvious to those skilled in the art to
which the invention relates that modi?cations
30 may be made in details of construction and ar
rangement in matters of mere form without de
parting from the spirit of the invention which is
not limited in respect to such matters or other
wise than as the prior art and the appended
claims may require.
_
-
I claim:-
.
‘
1. In the method of introducing glass ?bers
into the lead oxide material 01' storage battery
plates the improvement which consists in pri
marily making a water paste of lead oxide of
soupy consistency, mixing with said paste glass
wool ?bers of comparatively long lengths by stir
ring and while the ?bers are water wet and while
the paste is being stirred adding gradually to the
pastev a solution of sulphuric acid and water
which sti?'ens the paste, and continuing the stir
ring to break up the long ?bers without substan 15
tial formation oi’ ?ne particles oi’ glass into
lengths suitable for pasting the grids.
2. In the method of introducing glass ?bers
into thelead oxide material of storage battery
plates the improvement which consists in pri 20
marily making a water paste of lead oxide of
soupy consistency, mixing with said paste glass
wool ?bers or comparatively long lengths by
stirring and while the ?bers are water wet and
while the pastels being stirred adding gradually 25
to the paste a solution of sulphuric .acid and
water which sti?’ens the paste, and continuing
the stirring for a su?lcient time to break up the
long ?bers to any shorter lengths that may be so
desired.
.
CLARENCE A. HALL.
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