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US 2013/0158916 A1Published application
Battery fuel gauge
AssigneeQUALCOMM Incorporated
InventorsPaolo Baruzzi, Georgios Paparrizos, Giovanni Garcea
Life of this patent
Estimating the term…
Abstract
A system for estimating battery state of charge (SoC) includes evaluating a battery model to produce an estimated battery voltage using a previously produced SoC. Current and voltage measurements are combined with the estimated battery voltage to produce a present battery SoC. The battery model may be updated by taking battery measurements when certain conditions occur.
Claims16
A method for estimating a battery state of charge (SoC) of a battery comprising:
- providing a representation of a battery model, the battery model comprising an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component;
- acquiring a current measurement of the battery;
- acquiring a voltage measurement of the battery;
- computing a present estimate of the battery SoC using the current measurement, the voltage measurement, and a previous estimate of a battery voltage produced from an evaluation of the battery model;
- evaluating the battery model to compute a present estimate of the battery voltage using at least a value of the OCV component and a voltage of the Rseries component;
- and
- updating a value of the Rseries component when a condition is met, including acquiring at least a measurement of the voltage of the battery and using the measurement to compute an updated value of the Rseries component.
4 more elements
A system to estimate battery SoC of a battery comprising:
- a current sensor to sense current flow in a battery;
- a voltage sensor to sense a voltage of the battery;
- a representation of a battery model, the battery model comprising an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component, wherein evaluation of the battery model produces an estimated battery voltage;
- and
- circuitry to produce a present value of battery SoC based on the current flow in the battery, the voltage of the battery, and the estimated battery voltage,
- wherein the estimated battery voltage is based at least on a value of the OCV component and a voltage of the Rseries component,
- wherein a value of the Rseries component is updated when a condition is met, including the voltage sensor acquiring a measurement of the voltage of the battery and using the measurement of the voltage of the battery to compute an updated value of the Rseries component.
4 more elements
A circuit to estimate battery SoC of a battery comprising:
- battery measurement means for acquiring a measure of current flow in a battery and a measure of a voltage of the battery;
- a battery voltage estimation means for producing an estimated battery voltage of the battery based on a model of the battery, the model of the battery including an equivalent series resistance (Rseries) component;
- a SoC estimation means for producing an estimate of battery SoC using the measure of current flow, the measure of voltage, and a previous estimate of a battery voltage produced by the battery model;
- and
- updating means for updating a value of the Rseries component when a condition is met, including using a measure of the voltage of the battery and a measure of current flow in the battery to compute an updated value of the Rseries component.
2 more elements
Dependencies are inferred from the claim text.