Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Patent
1997-11-25
2000-03-07
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
429148, 429120, 429151, 429156, H01M 202
Patent
active
060338008
DESCRIPTION:
BRIEF SUMMARY
This application is the U.S. national-phase application of PCT International Application No. PCT/JP97/00085.
1. Field of the Invention
The present invention relates to a battery container, and a battery and multi-tier battery using the battery container.
2. Background of the Invention
It is a usual practice to build a large capacity battery by putting together a plurality of unit battery cells of nickel-cadmium battery, nickel-hydrogen battery, hydrogen battery and the like.
The large capacity battery thus constructed is used as a power supply source in various home electrical appliances and electric automobiles.
Heat is produced inside of the battery of this type due to charging and discharging of the unit battery cells while the battery is used.
Since battery's electric energy storing elements such as electrodes, electrolyte and the like are, in general, contained and sealed in a container made of synthesized resin materials such as polypropylene and the like, the heat Produced inside is accumulated within the battery, thereby causing the internal temperature of each respective unit battery cell to increase. The increased temperature of the unit battery cells results in degradation of the electric energy storing elements, deterioration in battery performance and shorter life of the battery.
Large capacity batteries are sometimes built by putting together as many unit battery cells as several tens to several hundreds and in that case each respective unit battery cell located in the center of a group of unit battery cells is exposed to the heat produced in both the neighboring unit battery cells.
On top of that, heat dissipation from the unit battery cells located in the center is hindered from taking place.
The net result is a tremendous temperature increase in the unit battery cells.
As unit battery cells having the larger storage capacity per unit volume are used or the more improved battery performance is sought, the more amount of heat is produced.
The problem of the above accumulation of heat or temperature rise observed in a battery wherein a plurality of unit battery cells are put together was addressed by the technology disclosed in the Japanese Patent Gazette TOKKAIHEI3(1991)-291867.
According to this technology, heat is dissipated by providing spacings between unit battery cells, where air is allowed to circulate.
However, even by providing air circulating spacings between unit battery cells, the temperature rise of batteries has not been adequately suppressed.
The reason for above is that even if air is brought into contact with the walls that form a container for unit battery cells the container made of synthetic resin shows low thermal conductivity, thus resulting in an inadequate dissipation of heat through the walls of the container.
SUMMARY OF THE INVENTION
The present invention provides a battery container and a battery using it, whereby deterioration of battery characteristics due to heat accumulation or temperature rise within the battery can be prevented by improving thermal dissipation of the battery.
For achieving the above objective, the present invention discloses a container for containing battery elements that comprises walls, each of which has large thickness sections on the outer rims of the wall's four sides and a small thickness area surrounded by the foregoing large thickness sections with the thickness thereof made smaller than that of the large thickness sections.
Also, the present invention discloses a container for containing battery elements that comprises walls, each of which has large thickness sections on the outer rims of the wall's three sides with the lower side of the wall excluded and a small thickness area surrounded by the foregoing large thickness sections with the thickness thereof made smaller than that of the large thickness sections.
In addition, the small thickness area surrounded by the large thickness sections located on the outer rims of each respective wall that composes a container for containing battery elements occupies 40 to 80% and more prefe
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Hamada Shinji
Ichiyanagi Takashi
Ikoma Munehisa
Kakino Manabu
Sato Kenji
Matsushita Electric - Industrial Co., Ltd.
Nuzzolillo Maria
O'Malley Jennifer
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