Chemistry: electrical current producing apparatus – product – and – Having specified venting – feeding or circulation structure – Having nonmovable means providing motion between electrolyte...
Patent
1997-12-23
2000-02-08
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Having specified venting, feeding or circulation structure
Having nonmovable means providing motion between electrolyte...
429176, 264564, H01M 238, H01M 202
Patent
active
060226366
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an improved case, particularly suitable for making lead accumulators.
As known, the cases used for making accumulators generally comprise a container provided with one or more than one cell, suitable for containing an electrolyte, in which the accumulator elements and a lid, coupled with the perimetrical edge of the opening of said container, are immerged. Said lid is provided with at least one couple of holes suitable for receiving the poles connected to said elements, and at least a through hole connected to the internal of said container.
Internally or externally from said container, one or more tubes, which have an end placed close to the opening of said container, may be placed, while the opposite end communicates with the interior of the container through its bottom.
Such adduction tubes have a double function, because during the first or initial charging of the accumulator they are used for the recirculation of the electrolyte, so that the charging becomes quicker, while during subsequent recharging made during life of the accumulator, they are used to introduce at the container bottom some air suitable for moving the electrolyte and for preventing the stratification.
Such adduction tubes, in the shapes of known type, communicate with special adduction plugs for the electrolyte or for air placed in the through hole made in the lid through tubes made in the lid itself.
According to some shapes of the known type, the adduction tubes are located internally or externally from the container, which they are fixed to by gluing. According to other making systems suitable for obtaining a better quality of the manufacture, the adduction tubes are made integral with the container, directly during the moulding.
In particular, a known method provides that the adduction tubes are made during the moulding of the container with gas co-injection.
Such a moulding method with gas co-injection is disadventageous because it requires the realization of a die provided with a matrix and with a punch, which is very expensive to build, especially when said adduction tubes have to be made with the presence of undercuts.
It is very important that when said adduction tubes are located externally from the container, they don't modify the outline of the container itself, and for this reason they are preferably placed at the edges of the container.
It is also to be considered that in the accumulators, which have the external measures equal, the quantity of electrolyte in a container increases as the wall thickness of the container decreases. This thickness, in the containers obtained by mould injection or gas co-injection moulding, cannot fall under a minimal value.
It is desirable to to provide a container which, compared to the containers of the known type equal adduction tubes with external dimensions, having a larger volume of electrolyte, while the volume of the accumulator elements immerged in the electrolyte itself is the same.
Said aims are achieved providing a case for accumulators which, according to the invention, comprises: in which are immerged the elements of said accumulator; said container; opening located next to said perimetrical edge which delimitates the inlet of said container and a second opening communicating with the internal area of the container itself located next to its bottom, and it is characterized in that at least said adduction tube is placed externally from said container and is made using the blowing technique at the same time on the container resulting in a unique shape.
Advantageously, the container of the invention allows manufacture of cases for accumulators with reduced costs than the techniques usually adopted, because the manufacture is quicker and also because some material is saved.
So advantageously said cases, compared to equivalent cases having the same features, have a bigger internal volume and so they enable to realize accumulators with a better quality and efficiency, because the relationship between the electrolyte volume and the volume of the elements im
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