Systems and methods for balancing battery cells
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United States of America Patent
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Feb 10, 2015
Grant Date -
Feb 7, 2013
app pub date -
Aug 29, 2011
filing date -
Aug 5, 2011
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Abstract
A cell balancing system includes multiple bypass paths and a battery management circuit. The multiple bypass paths are coupled in parallel to the battery cells. The battery management circuit is coupled to the bypass paths and monitors cell voltages of the battery cells, compares the cell voltages with a first reference voltage for a first stage, enables a bypass path in the first stage if a battery cell in parallel with the bypass path has a cell voltage at the first reference voltage, and compares the cell voltages of the battery cells with a second reference voltage for a second stage if a specified cell voltage in the first stage is at the first reference voltage.
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