Extended shelf-life battery
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United States of America Patent
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Jun 15, 1993
Grant Date -
N/A
app pub date -
Mar 27, 1991
filing date -
Mar 27, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a method for maintaining the specific gravity of acid in a lead-acid battery within a predetermined range to prevent undesirable plate degradation and gassing during storage. Extended shelf-life is accomplished by employing a battery which is formed to the desired voltage and which is stored in a damp condition with the electrolyte maintained in a range which, in the most preferred embodiment, is between about 1.015 and 1.320. A desiccant, for example a gelled sulfuric acid desiccant, is placed in the battery housing, out of contact with the plates, to absorb the water vapor which is generated by the self-discharge reactions. The amount of desiccant is selected so that all the water vapor formed during such reactions is removed to maintain the specific gravity of the electrolyte in said range. Extended shelf-life results, and the desiccant can be used to form the battery electrolyte at the time it is desired to place the battery in service.
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