Chemistry: electrical current producing apparatus – product – and – Means externally releasing internal gas pressure from closed...
Patent
1998-01-22
2000-06-06
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Means externally releasing internal gas pressure from closed...
429 54, 429 72, 429 82, H01M 212
Patent
active
060716371
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sealed casing provided for withstanding a certain pressure and intended to contain notably an electric accumulator, the casing being formed by at least one wall which has at least one closing area formed by a plastic band for connecting two edges of the wall.
The invention also relates to a flat accumulator formed from such a casing.
The invention finds highly significant applications, for example, for containing an accumulator of the lithium-ion or lead-acid type.
U.S. Pat. No. 5,326,652 describes such an accumulator and its casing. However, in that document, the problem of internal pressure of the accumulator is not mentioned. Indeed, the accumulators create pressures inside the envelopes formed by the casings containing them. This pressure may sometimes be so high that the envelope explodes, which is very dangerous, above all if the accumulator is of the type containing lithium. Therefore, valves may be provided which open when the variation of pressure exceeds a certain value that is incompatible with the solidity of this envelope.
SUMMARY OF THE INVENTION
The present invention proposes a casing of the type defined in the opening paragraph, the casing having an effective and low cost valve which can be incorporated notably in ultraflat casings.
Therefore, such a casing is characterized in that the closing area comprises an adhesive part and a shiftable part.
Thus, thanks to the invention, when the pressure is too large, the shiftable part which is not fixed to the edges of the wall may shift and leave an opening, so that the gas creating excessive pressure can escape.
According to a first characteristic feature of the invention, the length of the shiftable part is such that said shiftable part comes loose from said edges under the influence of an excessive pressure, thus creating an opening to the exterior.
The elasticity of this shiftable part is sufficient so that when the pressure becomes normal again, the part reassumes its natural position. The operation of the inside element is re-established.
According to a second characteristic feature of the invention, at least one opening to the exterior of said plastic casing is provided at the level of said edges and the length of the shiftable part is such that under the influence of excessive pressure the opening is brought into contact with the exterior of said casing after the band has shifted.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 shows in an exploded view a casing according to the invention,
FIG. 2 shows an elevational view of the opening area,
FIG. 3 shows the deformation of the band under the influence of pressure,
FIG. 4 shows a variant of a preferred embodiment of a casing according to the invention,
FIG. 5 shows the deformation of the band,
FIGS. 6A-6B show a second variant of an embodiment,
FIGS. 7A-7B show a third variant of an embodiment of the invention,
FIGS. 8A-8B show a fourth variant of an embodiment of the invention, and
FIG. 9 shows a flat accumulator formed on the basis of a casing, all this in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1 is shown a casing of cylindrical form. It is formed by a side wall 1 formed by a curved plate, so that it has a cylindrical form. A cap 3 blocks the upper part of the cylinder, whereas a base 5 blocks the lower part. This plate 1 has two edges 8 and 9 which, as a result of the plate being curved, come in each other's proximity and overlap each other. For connecting these edges, a closing area 10 is provided in the part situated inside this overlap formed, in essence, by a silicon-based resin band 11. This area is to be such that when the cap 3 and the base 5 are put in place, the sealing of the casing thus formed is to be ensured. The casing is also to be able to withstand a certain internal pressure.
According to the invention, this closing area 10
REFERENCES:
patent: 5326652 (1994-07-01), Lalke
Halajian Dicran
Kalafut Stephen
U.S. Philips Corporation
Wills Monique
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