Method and apparatuses for determining a state of charge
First Claim
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1. A method, comprising:
- detecting a state with low current load of a battery;
measuring a plurality of terminal voltage values of the battery at different points in time in the state with low current load, before the terminal voltage reaches a steady state;
applying a correction value to each terminal voltage value measured in the state with low current load to yield corrected terminal voltage values, each correction value being based on a precharacterization parameter which describes a voltage difference during relaxation of the battery between a first time and a second time;
estimating a value for an open terminal voltage of the battery in the steady state at a desired time based on the corrected terminal voltage values; and
determining a state of charge of the battery based on the estimated value for the open terminal voltage of the battery in the steady state at the desired time.
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Abstract
Methods and apparatuses for determining a state of charge of a battery are provided, wherein measurements of a terminal voltage of the battery and stored precharacterization parameters are used for determining the state of charge.
13 Citations
20 Claims
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1. A method, comprising:
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detecting a state with low current load of a battery; measuring a plurality of terminal voltage values of the battery at different points in time in the state with low current load, before the terminal voltage reaches a steady state; applying a correction value to each terminal voltage value measured in the state with low current load to yield corrected terminal voltage values, each correction value being based on a precharacterization parameter which describes a voltage difference during relaxation of the battery between a first time and a second time; estimating a value for an open terminal voltage of the battery in the steady state at a desired time based on the corrected terminal voltage values; and determining a state of charge of the battery based on the estimated value for the open terminal voltage of the battery in the steady state at the desired time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus, comprising:
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a detection apparatus configured to measure a plurality of terminal voltage values of a battery at different points in time in a state with low current load, before the terminal voltage reaches a steady state; a memory configured to store;
precharacterization parameter which describes a voltage difference during relaxation of the battery between a first time and a second time; andan evaluation apparatus configured to; apply a correction value to each terminal voltage value measured in the state with low current load to yield corrected terminal voltage values, each correction value being based on the precharacterization parameter; estimate a value for n open terminal voltage of the battery in the steady state at a desired time based on the corrected terminal voltage values; and determine a state of charge of the battery based on the estimated value for the open terminal voltage of the battery in the steady state at the desired time. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification