초록 ▼

An apparatus and methods for determining dynamic state-of-charge of a battery that is subject to periodic charging and discharging within a system. Correction factors .eta. are determined for various operational conditions of current, temperature and state of charge which relate relative discharge a

An apparatus and methods for determining dynamic state-of-charge of a battery that is subject to periodic charging and discharging within a system. Correction factors .eta. are determined for various operational conditions of current, temperature and state of charge which relate relative discharge and charge efficiency with a reference set of conditions. According to conditions, the correction factor, either calculated in real-time or retrieved as a stored value, is then applied periodically to the charge and discharge currents of the battery to adjust an estimated state-of-charge value (SOC) for the battery within the given system.

대표청구항 ▼

[ What is claimed is:] [3.]3. A method of determining dynamic state-of-charge within a battery that is subject to periodic charging and discharging, comprising:(a) determining a set of parameters from which a correction factor .eta. may be calculated for the battery under operational conditions base

[ What is claimed is:] [3.]3. A method of determining dynamic state-of-charge within a battery that is subject to periodic charging and discharging, comprising:(a) determining a set of parameters from which a correction factor .eta. may be calculated for the battery under operational conditions based on data collected from testing of a set of reference batteries, wherein said correction factor .eta. expresses the level of effective current transfer with the battery under a given set of conditions;(b) calculating a correction factor .eta. for a given operational condition from said set of parameters; and(c) applying said correction factor .eta. to the calculation of .DELTA.SOC=(.eta..times.i.times..DELTA.t)/Q.sub.n to update the state-of-charge (SOC) under the present operating conditions such that the correction factor .eta. is thereby factored into currents i being applied to and received from said battery which are tracked over a period of time .DELTA.t in relation to nominal battery capacity Q.sub.n to provide a state-of-charge value for the battery.