Battery cell charge balancing
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United States of America Patent
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Sep 26, 2017
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app pub date -
Oct 26, 2012
filing date -
Oct 26, 2011
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Abstract
A method and/or system for charge balancing across one or more modules or cells of a large battery system is described. In one embodiment to balance the modules, the battery management system may monitor the voltage output of the one or more modules of the battery system during recharging of the modules and compare the measured voltages to a set cutoff voltage. When one or more of the modules meets or exceeds the cutoff voltage, the battery system may activate an energy dissipating device associated with the one or more modules that meets or exceeds the cutoff voltage to reduce the voltage output from those modules below the cutoff voltage before the recharging signal is reapplied to the modules. Through multiple iterations of monitoring, charging and reducing the energy from the modules above the target, the SOC of each modules becomes balanced near or at the cutoff voltage.
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