METHOD AND APPARATUS FOR ESTIMATING STATE OF BATTERY

• US 20160003917A1
• Filed: 12/11/2014
• Published: 01/07/2016
• Est. Priority Date: 07/02/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: YOU, Kaeweon, PARK, SangDo
• Granted Patent: US 10,393,819 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health

Abstract

A battery state estimation method and apparatus. The apparatus includes a time detector configured to detect a time during which a voltage level of a battery, being partially charged and discharged, changes through a constant current charge. The apparatus also includes a state of health (SoH) information estimator configured to estimate SoH information of the battery with the changed voltage level and the detected time, based on predetermined reference information.

Claims

1. A battery information estimation apparatus, comprising:

a time detector configured to detect a time during which a voltage level of a battery, being partially charged and discharged, changes through a constant current charge; and

a state of health (SoH) information estimator configured to estimate SoH information of the battery with the changed voltage level and the detected time, based on predetermined reference information.

2. The apparatus of claim 1, wherein the time detector comprises:

a voltage detector configured to detect the changed voltage level; and

a time measurer configured to measure the time during which the voltage level changes.

3. The apparatus of claim 1, further comprising:

a charge state determiner configured to determine whether the battery is in a charge state,

wherein the time detector is configured to detect the time during which the voltage level changes in response to the charge state determiner determining that the battery is in the charge state.

4. The apparatus of claim 1, wherein the predetermined reference information comprises reference time information indicating information of the time during which the voltage level of the battery, being fully charged and discharged, changes through the constant current charge based on predetermined voltage intervals, and comprises reference SoH information including SoH information of the battery.

5. The apparatus of claim 4, wherein a lookup table comprises the reference time information and the reference SoH information.

6. The apparatus of claim 4, wherein the reference time information and the reference SoH information are classified for each cycle in which the battery is fully charged and discharged.

7. The apparatus of claim 4, wherein the reference time information and the reference SoH information are classified for each charging rate of the battery.

8. The apparatus of claim 4, wherein the SoH information estimator is configured to detect a voltage interval mapped to the changed voltage level of the battery, being partially charged and discharged, from among the predetermined voltage intervals, and

extract a time mapped to the detected time, from among items of time information corresponding to the mapped voltage interval in the reference time information.

9. The apparatus of claim 8, wherein the SoH information estimator is configured to extract the time mapped to the detected time from the reference time information and, based on the mapped time, extract the SoH information of the battery, being partially charged and discharged, from the reference SoH information.

10. The apparatus of claim 8, wherein the time detector is configured to detect a time during which the voltage level of the battery, being partially charged and discharged, changes to correspond to the mapped voltage interval, and

the SoH information estimator is configured to extract a time, which is mapped to the time during which the voltage level of the battery, being partially charged and discharged, changes to correspond to the mapped voltage interval, from among the items of time information corresponding to the mapped voltage interval.

11. The apparatus of claim 8, wherein in response to the voltage interval mapped to the changed voltage level being absent in the predetermined voltage intervals, the SoH information estimator is configured to extract the voltage interval mapped to the changed voltage level by interpolating the predetermined voltage intervals, and extract the time mapped to the detected time from among the items of time information corresponding to the extracted voltage interval.

12. The apparatus of claim 8, wherein, in response to the time mapped to the detected time being absent in the items of time information, the SoH information estimator is configured to extract the time mapped to the detected time by interpolating the items of time information corresponding to the mapped voltage interval.

13. The apparatus of claim 1, wherein the SoH information estimator is further configured to prevent the battery 110 from overcharging and overdischarging, and controls battery modules in the battery to be in equal charge states by performing cell balancing.

14. The apparatus of claim 1, wherein the SoH information estimator is further configured to estimate a state of charge (SoC) information and a state of function (SoF) information, wherein the SoC information is information on an amount of charges held in the battery, and the SoF information indicates information on a degree to which the performance of the battery matches a predetermined condition.

15. The apparatus of claim 1, wherein in response to the battery being partially charged and discharged, the SoH information estimator is configured to estimate the SoH information on the battery by detecting a constant current charging time (CCCT) based on the predetermined reference information.

16. The apparatus of claim 1, wherein the battery is charged at a constant current until the voltage level of the battery reaches a predetermined voltage level, and

when the voltage level of the battery reaches the predetermined voltage level, the battery is charged using a constant voltage until a current level reaches a predetermined current level.

17. A battery information preprocessing apparatus, comprising:

a state change information acquirer configured to acquire information about a state change of a battery being fully charged and discharged during cycles;

a reference time information detector configured to detect, based on the information about the state change, reference time information of a time during which a voltage level of the battery changes through a constant current charge based on predetermined voltage intervals for each of the cycles; and

a reference state of health (SoH) information detector configured to detect, based on the information about the state change, reference SoH information indicating SoH information on the battery for each of the cycles.

18. The apparatus of claim 17, wherein the state change information acquirer is configured to acquire information on a capacity change of the battery based on the cycles in which the battery is fully charged and discharged.

19. The apparatus of claim 18, wherein the reference SoH information detector is configured to operate a ratio between a capacity of the battery corresponding to first full charging and discharging and a capacity of the battery corresponding to N^th full charging and discharging, N being a number of the cycles, and

extract SoH information of the battery corresponding to the N^th full charging and discharging.

20. The apparatus of claim 17, wherein the reference time information detector is configured to classify a voltage interval in which the battery is fully charged into the predetermined voltage intervals.

21. The apparatus of claim 17, wherein the reference time information detector is configured to classify the reference time information for each charging rate of the battery, and

the reference SoH information detector is configured to classify the reference SoH information for each charging rate of the battery.

22. The apparatus of claim 17, further comprising:

a storing unit configured to store the reference time information and the reference SoH information.

23. A battery information estimation method, comprising:

detecting a time during which a voltage level of a battery being partially charged and discharged, changes through a constant current charge; and

estimating state of health (SoH) information of the battery with the changed voltage level and the detected time, based on predetermined reference information.

24. A battery information preprocessing method, comprising:

acquiring information on a state change of a battery being fully charged and discharged during cycles;

detecting, based on the information on the state change, reference time information of a time during which a voltage level of the battery, changes through a constant current charge based on predetermined voltage intervals for each of the cycles; and

detecting, based on the information on the state change, reference state of health (SoH) information indicating SoH information of the battery for each of the cycles.

25. A battery information estimation method, comprising:

acquiring information on a state change of a first battery, which is fully charged and discharged, during cycles;

detecting, based on the information on the state change of the first battery, reference time information of a time during which a voltage level of the first battery is changed, through a constant current charge, based on predetermined voltage intervals for each of the cycles;

detecting, based on the information on the state change of the first battery, reference state of health (SoH) information indicating SOH information on the first battery for each of the cycles;

detecting a time during which a voltage level of a second battery, which is partially charged and discharged, changes through the constant current charge; and

estimating SoH information on the second battery corresponding to the changed voltage level and the detected time based on the reference time information and the reference SoH information.