Circuitry and techniques for determining an SOC of a battery/cell having a silicon-based anode and a fuel gauge therefor
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United States of America Patent
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Nov 22, 2016
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app pub date -
Mar 3, 2014
filing date -
Mar 5, 2013
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Abstract
A system and technique for determining a state of charge (SOC) of a battery having at least two terminals and at least one silicon-based anode, or other anode materials exhibiting hysteretic voltage-SOC dependence such as tin-based anodes (whether partial or full dependence). The system and technique determines whether the battery is in a charge mode or a discharge mode of operation, measures a terminal voltage of the battery, and determines the SOC of the battery using (a) a first predetermined relationship between (i) the terminal voltage of the battery and (ii) the SOC of the battery when the battery is in a charge mode, and (b) a second predetermined relationship between (i) the terminal voltage of the battery and (ii) the SOC of the battery when the battery is in a discharge mode. In one embodiment, the terminal voltage is an equilibrium voltage of the battery.
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