Method of predicting the state of charge as well as the use time left of a rechargeable battery
First Claim
1. A method of estimating the state-of-charge for a rechargeable lithium battery, comprising the steps of:
- determining whether the battery is in an equilibrium state or in a non-equilibrium state; and
if the battery is in an equilibrium state, measuring the voltage across the battery and converting this measured voltage into an equilibrium state-of-charge value;
if the battery is in a non-equilibrium state, calculating the charge withdrawn from or supplied to the battery by means of current integration, and subtracting this charge from or adding it to a state-of-charge value calculated earlier.
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Abstract
Disclosed is a method of estimating the state of charge of a rechargeable lithium battery. The first step of said method is to determine whether the battery is in an equilibrium state or in a non-equilibrium state. If the battery is determined to be in an equilibrium state, the voltage across the battery is measured and converted into an equilibrium state-of-charge value. If the battery is in a non-equilibrium state, the charge withdrawn from or supplied to the battery is calculated by means of current integration, and this charge is subtracted from or added to a state-of-charge value calculated earlier.
Also disclosed is a method of estimating the time that an application can be used under predefined conditions.
53 Citations
11 Claims
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1. A method of estimating the state-of-charge for a rechargeable lithium battery, comprising the steps of:
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determining whether the battery is in an equilibrium state or in a non-equilibrium state; and
if the battery is in an equilibrium state, measuring the voltage across the battery and converting this measured voltage into an equilibrium state-of-charge value;
if the battery is in a non-equilibrium state, calculating the charge withdrawn from or supplied to the battery by means of current integration, and subtracting this charge from or adding it to a state-of-charge value calculated earlier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electronic network model of a rechargeable battery comprising at least one RC circuit wherein the values of the resistor and the capacitor are related to a time-dependent part of the overpotential of the battery, at least two resistors wherein the value of one resistor is related to the remaining capacity of the battery which corresponds to the overpotential, and a voltage source whose value is related to the remaining capacity of the battery which corresponds to the equilibrium voltage.
Specification