Method and apparatus for correcting error occurring in estimation of battery life

• US 10,345,390 B2
• Filed: 09/25/2014
• Issued: 07/09/2019
• Est. Priority Date: 04/18/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sun Jae
• Primary Examiner(s): Barbee, Manuel L
• Assistant Examiner(s): Nimox, Raymond L
• Application Number:
  US14/496,880
• Publication Number:
  US 20150301122A1
• Time in Patent Office: 1,748 Days
• 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

An apparatus and method for correcting an error occurring in estimation of a life of a battery. Either one or both of usage information and battery environment information are collected, and a weight corresponding to the either one or both of the battery usage information and the battery environment information may be calculated from a battery degradation model. The calculated weight may be reflected on a state of health (SOH), and the SOH may be corrected.

Claims

1. A battery state measuring apparatus, the apparatus comprising:

one or more processors configured to;

generate battery degradation information based on information of a degree of influence of battery usage information and battery environment information; and

in response to the battery degradation information being generated,

perform a first estimation of the SOH corresponding to the life of the battery,

accumulate periods of time in which the battery is degraded, and

correct a result of the first estimation of the SOH, to generate a second estimation of the SOH, using offsets obtained from one or more battery degradation models, based on the accumulated periods of time, the battery degradation information, and both of collected battery usage information and collected battery environment information for improving an accuracy in estimating of the SOH by performing the first and second estimation of the SOH; and

manage the battery based on the second estimation of the SOH.

2. The apparatus of claim 1, wherein the one or more processing devices are further configured to calculate a weight corresponding to the either one or both of the collected battery usage information and the collected battery environment information from the battery degradation information, and correct the estimated SOH based on the weight.

3. The apparatus of claim 1, wherein the battery degradation information comprises at least one of the battery usage information and the battery environment information used to reduce the life of the battery, and the degree of influence of the at least one of the battery usage information and the battery environment information on a reduction in the life of the battery.

4. The apparatus of claim 3, wherein

the one or more processing devices are further configured to determine at least one normalized battery degradation information obtained by respectively normalizing a degradation in the battery by the at least one of the battery usage information and the battery environment information;

and

the one or more processing devices are further configured to;

calculate a weight corresponding to the either one or both of the collected battery usage information and the collected battery environment information based on the degree of influence and the at least one normalized battery degradation information, and

correct the estimated SOH based on the weight.

5. The apparatus of claim 1, wherein the one or more processing devices are further configured to:

accumulate the periods of time in which the battery is degraded from the either one or both of the collected battery usage information and the collected battery environment information,

calculate a weight corresponding to the accumulated periods of time, and

correct the estimated SOH based on the weight.

6. The apparatus of claim 1, wherein the battery degradation information comprises:

a factor corresponding to a degradation in the battery caused by a rapid discharge of the battery;

a factor corresponding to a degradation in the battery caused by a rapid charge of the battery;

a factor corresponding to a full charge of the battery; and

a factor corresponding to a degradation in the battery based on a period of time in which the battery is exposed to a predetermined temperature range.

7. The apparatus of claim 1, wherein the collected battery usage information comprises any one or any combination of information associated with a rapid discharge of the battery, information associated with a rapid charge of the battery, and information associated with a full charge of the battery.

8. The apparatus of claim 1, wherein the collected battery environment information comprises either one or both of information associated with a temperature to which the battery is exposed, and information associated with a period of time in which the battery is exposed to a predetermined temperature range.

9. The apparatus of claim 1, wherein the one or more processing devices are further configured to estimate the SOH using a coulomb counting scheme.

10. The apparatus of claim 1, wherein the battery is mounted in an electric vehicle.

21. The apparatus of claim 1, wherein the apparatus is a battery management system.

22. The apparatus of claim 21, wherein the battery management system is configured to indicate to a user to change the battery when a determined SOH of the battery, based on the second estimation of the SOH, falls below a predetermined threshold.

11. A processor implemented battery measuring method, the method comprising:

generating battery degradation information based on information of a degree of influence of battery usage information and battery environment information;

in response to the battery degradation information being generated,

performing a first estimation of the SOH corresponding to the life of a battery,

collecting either one or both of battery usage information and battery environment information,

accumulating periods of time in which the battery is degraded, and

correcting a result of the first estimation of the SOH, to generate a second estimation of the SOH, using offsets obtained from one or more battery degradation models, based on the accumulated periods of time, the collected battery usage information and the collected battery environment information for improving an accuracy in estimating of the SOH by performing the first and second estimation of the SOH; and

managing the battery based on the second estimation of the SOH.

12. The method of claim 11, wherein the correcting comprises:

calculating a weight corresponding to the either one or both of the collected battery usage information and the collected battery environment information from the battery degradation information; and

correcting the estimated SOH based on the weight.

13. The method of claim 11, wherein the battery degradation information comprises the at least one of the battery usage information and the battery environment information used to reduce the life of the battery, and the degree of influence of the at least one of the battery usage information and the battery environment information on a reduction in the life of the battery.

14. The method of claim 13, further comprising storing in advance at least one normalized battery degradation information obtained by respectively normalizing a degradation in the battery by the at least one of the battery usage information and the battery environment information;

wherein the correcting comprises;

calculating a weight corresponding to either one or both of the collected battery usage information and the collected battery environment information based on the degree of influence and the at least one normalized battery degradation information; and

correcting the estimated SOH based on the weight.

15. The method of claim 11, wherein the correcting comprises:

accumulating the periods of time in which the battery is degraded from the either one or both of the collected battery usage information and the collected battery environment information;

calculating a weight corresponding to the accumulated periods of time; and

correcting the estimated SOH based on the weight.

16. The method of claim 11, wherein the battery degradation information further comprises:

a factor corresponding to a degradation in the battery caused by a rapid discharge of the battery;

a factor corresponding to a degradation in the battery caused by a rapid charge of the battery;

a factor corresponding to a full charge of the battery; and

a factor corresponding to a degradation in the battery based on a period of time in which the battery is exposed to a predetermined temperature range.

17. The method of claim 11, wherein the collected battery usage information comprises any one or any combination of information associated with a rapid discharge of the battery, information associated with a rapid charge of the battery, and information associated with a full charge of the battery.

18. The method of claim 11, wherein the collected battery environment information comprises either one or both of information associated with a temperature to which the battery is exposed, and information associated with a period of time in which the battery is exposed to a predetermined temperature range.

19. The method of claim 11, wherein the estimating of the SOH comprises estimating the SOH using a coulomb counting scheme.

20. A non-transitory computer-readable storage medium storing a program to control a computer to perform the method of claim 11.