Method and Circuitry to Calculate the State of Charge of a Battery/Cell

摘要

The present inventions, in one aspect, are directed to techniques and/or circuitry to applying a current pulse to the terminals of the battery during a charge, measuring a voltage at the terminals of the battery, selecting a relationship of an open circuit voltage to an amount of charge in the battery using data which is representative of a state of health of the battery, calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery, and determining a state of charge of the battery using (i) the calculated open circuit voltage and (ii) the relationship of the open circuit voltage to the amount of charge.

主权项

1. A method to determine a state of charge of a battery, wherein the battery includes at least two terminals, the method comprising:
selecting a first relationship of an open circuit voltage to an amount of charge in the battery based on or using a state of health of the battery during a first charge cycle; measuring a voltage at the terminals of the battery to generate a first measured voltage; calculating an open circuit voltage of the battery to generate a calculated open circuit voltage using the first measured voltage; and determining a first state of charge of the battery based on or using (i) the calculated open circuit voltage and (ii) the first relationship of the open circuit voltage to the amount of charge in the battery.