Method of balancing an electrical battery subjected to discontinuous charging, and a battery management system for implementing the method
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United States of America Patent
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Jun 15, 2004
Grant Date -
Dec 26, 2002
app pub date -
May 30, 2002
filing date -
Jun 7, 2001
priority date (Note) -
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Abstract
An electrical battery comprises a plurality of cells connected in series which are charged by a charger under the control of a battery management system including an individual current shunt circuit in parallel with each cell. The shunt circuit is activated if the voltage at the terminals of the cell exceeds a minimum balancing threshold value. A higher balancing threshold voltage is substituted for the minimum balancing threshold voltage if the battery has not been supplied with power by the charger for a time exceeding a particular time-delay. In the battery management system a single-wire control daisychain connects individual interfaces assigned to each cell of the battery in series to a common control interface.
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