Electronic device for estimating battery state and operating method thereof
Disclosed are an electronic device, including a memory configured to store parameters of an electrochemical model corresponding to a battery, a sensor configured to measure a voltage of the battery, and a processor configured to determine a first cumulative state of charge (SOC) correction amount at a partially discharged point in time at which a SOC of the battery is corrected by a corrector for reducing a voltage difference between an estimated voltage of the electrochemical model and the measured voltage of the battery, estimate a second cumulative SOC correction amount at a fully discharged point in time based on the first cumulative SOC correction amount and a SOC correction amount prediction curve, and update an aging parameter of the electrochemical model based on the second cumulative SOC correction amount.
1. An electronic device, comprising:
a memory configured to store parameters of an electrochemical model corresponding to a battery;
a sensor configured to measure a voltage of the battery; and
a processor configured to
determine a first cumulative state of charge (SOC) correction amount at a partially discharged point in time at which a SOC of the battery is corrected by a corrector for reducing a voltage difference between an estimated voltage of the electrochemical model and the measured voltage of the battery,
estimate a second cumulative SOC correction amount at a fully discharged point in time based on the first cumulative SOC correction amount and a SOC correction amount prediction curve, and
update an aging parameter of the electrochemical model based on the second cumulative SOC correction amount.
2. The electronic device of claim 1 , wherein the SOC correction amount prediction curve is determined based on a cumulative voltage difference curve determined by:
determining a voltage difference curve between the estimated voltage of the electrochemical model and the measured voltage of the battery based on a change in an anode potential according to aging of the battery; and
determining a cumulative voltage difference curve obtained by accumulating voltage differences from a point in time at which the voltage difference increases in the voltage difference curve.
3. The electronic device of claim 2 , wherein the SOC correction amount prediction curve is determined based on fixing the voltage difference curve according to the battery and that a cumulative voltage correction amount corresponds to a cumulative SOC correction amount.
4. The electronic device of claim 2 , wherein the point in time at which the voltage difference increases in the voltage difference curve comprises:
a point in time at which an anode stoichiometry of the battery is between 0.3 and 0.4, inclusive; or
a point in time at which the SOC of the battery is between 30% and 40%, inclusive.
5. The electronic device of claim 1 , wherein the processor is further configured to determine the second cumulative SOC correction amount, based on:
the first cumulative SOC correction amount;
a third cumulative SOC correction amount corresponding to a battery state at the partially discharged point in time in the SOC correction amount prediction curve; and
a fourth cumulative SOC correction amount corresponding to a battery state at the fully discharged point in time in the SOC correction amount prediction curve.
6. The electronic device of claim 1 , wherein the processor is further configured to determine the first cumulative SOC correction amount by the corrector from a point in time at which the voltage difference increases to the partially discharged point in time.
7. The electronic device of claim 1 , wherein the SOC correction amount prediction curve is determined based on a cumulative voltage difference curve determined by:
determining a voltage difference curve between a measured voltage of the battery in a fresh state and an estimated voltage of a large-capacity model having a larger capacity than the electrochemical model; and
determining a cumulative voltage difference curve obtained by accumulating voltage differences, based on a graph below a designated battery state in the voltage difference curve.
8. The electronic device of claim 1 , wherein the processor is further configured to:
store a parameter determined based on the second cumulative SOC correction amount in the memory, and
update the aging parameter of the electrochemical model using one or more parameters stored in the memory, in response to an update condition for the aging parameter being reached.
9. The electronic device of claim 1 , wherein the aging parameter comprises an electrode balance shift for the battery.
10. The electronic device of claim 1 , wherein the processor is further configured to estimate state information of the battery using the electrochemical model with the updated aging parameter.
11. A processor-implemented method of operating an electronic device, the operating method comprising:
determining a first cumulative state of charge (SOC) correction amount at a partially discharged point in time at which a SOC of a battery included in the electronic device is corrected by a corrector for reducing a voltage difference between an estimated voltage of an electrochemical model corresponding to the battery and a measured voltage of the battery;
estimating a second cumulative SOC correction amount at a fully discharged point in time based on the first cumulative SOC correction amount and a SOC correction amount prediction curve; and
updating an aging parameter of the electrochemical model based on the second cumulative SOC correction amount.
12. The operating method of claim 11 , wherein the SOC correction amount prediction curve is determined based on a cumulative voltage difference curve determined by:
determining a voltage difference curve between the estimated voltage of the electrochemical model and the measured voltage of the battery based on a change in an anode potential according to aging of the battery; and
determining a cumulative voltage difference curve obtained by accumulating voltage differences from a point in time at which the voltage difference increases in the voltage difference curve.
13. The operating method of claim 12 , wherein the SOC correction amount prediction curve is determined based on fixing the voltage difference curve according to the battery and that a cumulative voltage correction amount corresponds to a cumulative SOC correction amount.
14. The operating method of claim 12 , wherein the point in time at which the voltage difference increases in the voltage difference curve comprises:
a point in time at which an anode stoichiometry of the battery is between 0.3 and 0.4, inclusive; or
a point in time at which the SOC of the battery is between 30% and 40%, inclusive.
15. The operating method of claim 11 , wherein the estimating of the second cumulative SOC correction amount comprises determining the second cumulative SOC correction amount, based on
the first cumulative SOC correction amount;
a third cumulative SOC correction amount corresponding to a battery state at the partially discharged point in time in the SOC correction amount prediction curve; and
a fourth cumulative SOC correction amount corresponding to a battery state at the fully discharged point in time in the SOC correction amount prediction curve.
16. The operating method of claim 11 , wherein the determining of the first cumulative SOC correction amount comprises determine the first cumulative SOC correction amount by the corrector from a point in time at which the voltage difference increases to the partially discharged point in time.
17. The operating method of claim 11 , wherein the SOC correction amount prediction curve is determined based on a cumulative voltage difference curve determined by:
determining a voltage difference curve between a measured voltage of the battery in a fresh state and an estimated voltage of a large-capacity model having a larger capacity than the electrochemical model; and
determining a cumulative voltage difference curve obtained by accumulating voltage differences, based on a graph below a designated battery state in the voltage difference curve.
18. The operating method of claim 11 , further comprising:
storing a parameter determined based on the second cumulative SOC correction amount in a memory, and
updating the aging parameter of the electrochemical model using one or more parameters stored in the memory, in response to an update condition for the aging parameter being reached.
19. The operating method of claim 11 , wherein the aging parameter comprises an electrode balance shift for the battery.
20. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the operating method of claim 11 .