Improvements in or connected with Secondary Batteries.
Year: 1896

page_text: Date of Application, 14th Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in or connected with Secondary Batteries.
We, JOSEPH HORSNELL MAY of West Ferry Road Millwall in the County of
London Electrician and FRANK KING of 4 Great Winchester Street in the City
of London Engineer, do hereby declare the nature of this Invention to be as
follows:-
This Invention has reference to the covers, or envelopes, employed to retain
the active material upon the plates of secondary batteries and the object of
this Invention is to provide such covers, or envelopes, as are not liable to be
dissolved, or injuriously acted upon by the electrolyte in which they are immersed.
According to this Invention the said covers or envelopes (which may be of
celluloid, or other suitable material) are covered with India rubber in such a
manner that the said India rubber adheres firmly to the material of the cover
or envelope. The cover or envelope and the India rubber solution employed
may be either hot or cold and the solution may be applied in any suitable way
for example by dipping, or by painting or by squirting or spraying. To prevent
danger of the India rubber becoming detached from the material of the cover
or envelope it is preferred to treat the material of the cover or envelope with a
solvent therefor so as to render it sticky or in such a condition that the India
rubber will adhere firmly thereto. The solvent used for the India rubber is
preferably one which readily volatizes. The solution of India rubber can be
applied once or any number of times in accordance with the thickness of India
rubber desired. When the covers or envelopes are perforated or formed with
irregularities of surface any India rubber solution which may cover or enter the
perforations or irregularities can be removed by means of a current of air directed
thereagainst.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents
COMPLETE SPECIFICATION.
Improvements in or connected with Secondary Batteries.
We, JOSEPH HORSNELL MAY of West Ferry Road, Millwall, in the County of
London, Electrician, and FRANK KING of 4 Great Winchester Street in the City,
of London, 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 has reference to the covers, or envelopes, employed to retain

page_text: the active material upon the plates of lead secondary batteries and the object of
this Invention is to provide such covers, or envelopes, as are not liable to be
dissolved, or injuriously acted upon, by the electrolyte in which they are immersed.
or by gases evolved during the working of the battery, or by contact with the
peroxide.
According to this Invention the said covers or envelopes (which may be of
celluloid, or other suitable material) are covered with India rubber in such a
manner that the said India rubber adheres firmly to the material of the cover
or envelope. Figure 1 of the accompanying drawing represents in section an
element comprising this Invention and Figure 2-is a section of part of the cover,
or envelope drawn to a larger scale. a is the grid or support, b the active material
c a porous covering of. silicated asbestos for example, and d is a perforated cover,
or envelope. e is the adherent India rubber applied as aforesaid to the said cover,
or envelope d. The cover or envelope, and the India rubber solution employed,
may be either hot, or cold, and the solution may be applied in any suitable way,
for example, by dipping or by painting, or by squirting, or spraying. To prevent
danger of the India rubber becoming detached from the material of the cover,
or envelope, it is preferred to treat the material of the cover, or envelope, with a
solvent therefor, so as to render it sticky, or in such a condition that the India
rubber will adhere firmly thereto. The solvent used for the India Rubber is
preferably one which readily volatizes. The solution of India rubber can be
applied once or any number of times, in accordance with the thickness of India
rubber desired, Any India rubber solution which may form a film over, and
thus close or cover, the perforations of the cover, or envelope can be removed by
means of a strong current or blast of air directed against the surface of the said
cover, or envelope, while the India rubber solution is still soft.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed, we declare that what
we claim is;-
1. In, or for, secondary batteries, an element provided with a cover, or envelope,
to which is applied a coating of adherent India rubber, substantially as, and for
the purposes herein before described.
2. In, or for, secondary batteries, an element provided with a cover, or envelope,
which is first treated with a solvent and then has applied to it a coating of India
rubber, substantially as, and for the purposes hereinbefore described.
Dated the 10th day of July 1897
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.