Method and apparatus with battery state estimation

Patent metadata

Field	Value
Publication number	US-11262407-B2
Application number	US-202016857377-A
Country	US
Kind code	B2
Filing date	Apr 24, 2020
Priority date	Dec 2, 2019
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A method with battery state estimation may include: generating a plurality of electrochemical-thermal (ECT) models corresponding to modeling conditions based on an arbitrary parameter of an ECT model configured to perform modeling of a battery; determining a target parameter of the ECT model based on an error between an actual state of the battery and a model-derived state of the battery obtained by a parallel operation of the plurality of ECT models; and estimating a state of the battery based on the target parameter.

First claim

What is claimed is:

1. A method with battery state estimation, comprising:
generating a plurality of electrochemical-thermal (ECT) models corresponding to modeling conditions based on an arbitrary parameter of an ECT model configured to perform modeling of a battery;
determining a target parameter of the ECT model based on an error between an actual state of the battery and a model-derived state of the battery obtained by a parallel operation of the plurality of ECT models; and
estimating a state of the battery based on the target parameter.

2. The method of claim 1 , wherein the modeling conditions comprise a profile of a current input to the battery and an initial state of the battery.

3. The method of claim 1 , further comprising:
determining the arbitrary parameter within a parameter range that is determined in advance based on the modeling conditions.

4. The method of claim 1 , further comprising:
receiving the actual state of the battery, wherein the actual state of the battery is measured based on the modeling conditions.

5. The method of claim 1 , wherein the generating of the plurality of ECT models comprises generating the plurality of ECT models by replicating the ECT model with the arbitrary parameter.

6. The method of claim 1 , wherein the determining of the target parameter comprises:
assigning a first modeling condition included in the modeling conditions to a first ECT mode included in the plurality of ECT models;
assigning a second modeling condition included in the modeling conditions to a second ECT model included in the plurality of ECT models;
estimating the state of the battery based on the first ECT model;
estimating the state of the battery based on the second ECT model; and
determining the target parameter based on a first error between the actual state of the battery and the state of the battery as estimated based on the first ECT model, and a second error between the actual state of the battery and the state of the battery as estimated based on the second ECT model, and
wherein the estimating of the state of the battery based on the first ECT model and the estimating of the state of the battery based on the second ECT model are performed in parallel.

7. The method of claim 6 , wherein the determining of the target parameter based on the first error and the second error comprises:
merging the first error and the second error;
calculating a value of an objective function based on the merged first and second errors; and
determining, as the target parameter, a parameter that minimizes the value of the objective function.

8. The method of claim 1 , wherein the determining of the target parameter comprises:
generating a first candidate parameter based on the plurality of ECT models;
generating a second candidate parameter based on the plurality of ECT models; and
determining the target parameter based on the first candidate parameter and the second candidate parameter.

9. The method of claim 8 , wherein the first candidate parameter and the second candidate parameter are generated in parallel.

10. The method of claim 8 , wherein the generating of the first candidate parameter comprises:
estimating first states of the battery in parallel based on the plurality of ECT models; and
determining, as the first candidate parameter, a parameter that minimizes an objective function that is based on errors between the actual state of the battery and the estimated first states of the battery, and
wherein the generating of the second candidate parameter comprises:
estimating second states of the battery in parallel based on the plurality of ECT models; and
determining, as the second candidate parameter, a parameter that minimizes an objective function based on errors between the actual state of the battery and the estimated second states of the battery.

11. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the method of claim 1 .

12. An apparatus with battery state estimation, comprising:
a processor configured to:
generate a plurality of electrochemical-thermal (ECT) models corresponding to modeling conditions based on an arbitrary parameter of an ECT model configured to perform modeling of a battery;
determine a target parameter of the ECT model based on an error between an actual state of the battery and a model-generated state of the battery obtained by a parallel operation of the plurality of ECT models; and
estimate a state of the battery based on the target parameter; and

a memory configured to store an instruction executed by the processor to generate the plurality of ECT models, determine the target parameter of the ECT model, and estimate the state of the battery.

13. The apparatus of claim 12 , wherein the modeling conditions comprise a profile of a current input to the battery and an initial state of the battery.

14. The battery state estimation apparatus of claim 12 , wherein the processor is further configured to determine the arbitrary parameter within a parameter range that is determined in advance based on the modeling conditions.

15. The apparatus of claim 12 , wherein the processor is further configured to receive the actual state of the battery, the actual state of the battery being measured based on the modeling conditions.

16. The apparatus of claim 12 , wherein the processor is further configured to generate the plurality of ECT models by replicating the ECT model with the arbitrary parameter.

17. The apparatus of claim 12 , wherein the processor comprises:
a first core corresponding to a first ECT model included in the plurality of ECT models; and
a second core corresponding to a second ECT model included in the plurality of ECT models,
wherein the first core is configured to assign a first modeling condition included in the modeling conditions to the first ECT model and to estimate the state of the battery based on the first ECT model,
wherein the second core is configured to assign a second modeling condition included in the modeling conditions to the second ECT model and to estimate the state of the battery based on the second ECT model,
wherein the processor is further configured to determine the target parameter based on a first error between the actual state of the battery and the state of the battery as estimated by the first core, and a second error between the actual state of the battery and the state of the battery as estimated by the second core, and
wherein the first core and the second core estimate the state of the battery in parallel.

18. The apparatus of claim 17 , wherein the processor is further configured to:
merge the first error and the second error;
calculate a value of an objective function based on the merged first and second errors; and
determine, as the target parameter, a parameter that minimizes the value of the objective function.

19. The apparatus of claim 12 , wherein the processor comprises:
a first sub-processor configured to generate a first candidate parameter based on the plurality of ECT models; and
a second sub-processor configured to generate a second candidate parameter based on the plurality of ECT models, and
wherein the processor is further configured to determine the target parameter based on the first candidate parameter and the second candidate parameter.

20. The apparatus of claim 19 , wherein the first candidate parameter and the second candidate parameter are generated in parallel.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Jeonghyun
• You Kaeweon
• Kim Jinho

Classifications

• G01R31/367 Primary

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title

• G01R31/3835

  involving only voltage measurements · CPC title

• G01R31/374

  with means for correcting the measurement for temperature or ageing · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · CPC title