Method and apparatus for charging a valve-regulated lead acid battery
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United States of America Patent
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Apr 3, 2001
Grant Date -
N/A
app pub date -
Mar 15, 2000
filing date -
Mar 15, 1999
priority date (Note) -
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Abstract
A charging method and a charging apparatus which can be used particularly for charging a valve-regulated lead acid battery using a Pb-Sb alloy grid as a positive electrode grid. Primary constant-current charging is performed with a predetermined current value. The primary constant-current charging is further continued for an extension time t.sub.a after the battery voltage reaches a change-over voltage Vc. After the extension time has passed, the charging is changed over to secondary constant-current charging using a current value smaller than that of the primary constant-current charging. The extension time for continuing the primary constant-current charging is preferably set so as to be shorter as the battery temperature is higher. Also a secondary charging time for executing the secondary constant-current charging is preferably set so as to be shorter as the battery temperature is higher.
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