Method and system for determining the SOC of a rechargeable battery
AssigneeGP Batteries International Limited
InventorsKin Pun Wong, Sung On Andrew Ng, Che Wee Yeo
Life of this patent
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Abstract
A method of determining the state of charge (SOC) of a rechargeable battery, the method comprising charging the battery using a substantially constant charge current; measuring the battery temperature; and conducting a first measurement of the battery voltage at a time interval, t1, from the start of the charging, and a second measurement of the battery voltage at a time interval, t2, from the first measurement.
Claims22
A method of determining the state of charge (SOC) of a rechargeable battery, the method comprising
- charging the battery using a substantially constant charge current, wherein the battery has an unknown SOC at the commencement of the charging;
- measuring a battery temperature;
- conducting a first measurement of the battery voltage at a time interval, t1, from the start of the charging, and a second measurement of the battery voltage at a time interval, t2, from the first measurement, and
- determining the SOC of the battery based on the charge current, the battery temperature and the first and second measurements.
A system for determining the state of charge (SOC) of a rechargeable battery, the system comprising
- a source for charging the battery using a substantially constant charge current, wherein the battery has an unknown SOC at the commencement of the charging;
- a measurement unit for measuring the battery temperature and for conducting a first measurement of the battery voltage at a time interval, t1, from the start of the charging, and a second measurement of the battery voltage at a time interval, t2, from the first measurement;
- and
- a processor unit for determining the SOC of the battery based on the charge current, the battery temperature and the first and second measurements.
Dependencies are inferred from the claim text.