Improvements in Secondary Batteries.
Year: 1890

page_text: Date of Application, 21st Feb., 13:0
Complete Specification Left, 19th Nov., 1890-Accepted, 17th Jan., 1891
TRUVIDIUNAL DPTUITICATION.
Improvements in Secondary Batteries.
I. EDWARD THACKER MACKRILL, of Kingsbury Square, Aylesbury, in the County
of Buckingham, Electrical Engineer, do hereby declare the nature of my invention
to be as follows :-
My invention relates to that class of electric batteries known as secondary batteries,
used for the purpose of storing electricity.
When these batteries are overcharged with electric current, a considerable volume
of gas is evolved from the solution which rises to the surface of the liquid in the form
of bubbles, which break on reaching the surface and in consequence spray the acid
contained in the battery cells around the same.
The object of my invention is to obviate this spraying & so prevent the loss of
solution and also consequent inconvenience caused by the spraying which I effect in
the following manner.
I introduce into the cells small pilules or pellets of paraffin wax or other like acid
resisting substances which float on the surface of the electrolyte.
Now, when the batteries are overcharged and gases are evolved from the liquid, the
bubbles which rise to the surface and cause the spraying of the acid are broken by
coming in contact with the pellets of paraffin wax while the gas escapes from the
crevices left between the adjacent pellets, and the liquid is prevented from being forced
into the atmosphere by the bursting of the said gas bubbles.
The action effected during the evolution of the gases, is that of the revolution of the
pellets which allows of the giving off of the gas in a dispersed manner.
Doted this "1st day of Februar 1990
FELL & WILDING,
1, Queen Victoria Street, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Secondary Batteries.
I, EDWARD THACKER MACKRILL, of Kingsbury Square, Aylesbury, in the County
of Buckingham, Electrical 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:—
My invention relates to that class of electric batteries known as secondary batteries
used for the purpose of storing electricity.
When these batteries are overcharged with electric current a considerable volume
of gas is evolved from the solution which rises to the surface of the liquid in the form
of bubbles which break on reaching the surface and in consequence spray the acid
contained in the battery cells around the same.
The object of my invention is to obviate this spraying and so prevent the loss of
solution and also consequent inconvenience caused by the spraying, which I effect in
the following manner:
1 introduce into the cells small pilules or pellets of paraffin wax or other like
acid resisting substances which float on the surface of the electrolyte.
Now, when the batteries are overcharged and gases are evolved from the liquid, the
bubbles which rise to the surface and cause the spraying of the acid are broken by
coming in contact with the pellets of paraffin wax, while the gas escapes from the
crevices left between the adjacent pellets, and the liquid is prevented from being forced
into the atmosphere by the bursting of the said gas bubbles.

page_text: The action effected during the evolution of the gases, is that of the revolution of the
pellets which allows of the giving off of the gas in a dispersed manner.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1
The application of pellets or pilules of acid resisting material to the surface of the
electrolyte of secondary electric batteries, which float thereon substantially as and for
the purposes set forth.
Dated this 10th dox of November 1890
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.
i