Method and apparatus of charging the battery with globally minimized integral degradation possible for predefined charging duration

Patent metadata

Field	Value
Publication number	US-9236748-B2
Application number	US-201314014195-A
Country	US
Kind code	B2
Filing date	Aug 29, 2013
Priority date	Aug 30, 2012
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

An apparatus and method for charging a battery with an improved charging performance and a reduced degradation of the battery. A battery charging profile is configured to achieve a minimal degradation of a selected battery possible for a given charge time. A minimization is achieved using battery degradation modeling data indicative of a battery degradation level of a selected battery, and voltage and temperature response modeling data indicative of a predicted battery voltage and a predicted battery temperature of the selected battery as a function of time and charging current.

First claim

What is claimed is:

1. A system configured to facilitate charging of a battery, comprising:
a controller configured to control a battery charger for charging a selected battery, the controller configured to process a plurality of charging profile parameters to determine a battery charging profile configured to control the battery charger;
wherein the battery charging profile is configured to minimize degradation of the selected battery for a given charge time, wherein a minimization is achieved through battery degradation modeling data indicative of a battery degradation rate of the selected battery, and voltage and temperature response modeling data indicative of predicted battery voltage and temperature of the selected battery as a function of time and charging current.

2. The system as specified in claim 1 wherein the controller is configured to be responsive to a received battery temperature measurement to control the battery charging profile.

3. The system as specified in claim 1 wherein the controller is configured to utilize a battery depth of discharge measurement to control the battery charging profile.

4. The system as specified in claim 1 wherein the charging profile parameters are a function of a present battery degradation level.

5. The system as specified in claim 4 wherein the present battery degradation level is determined by an impedance measurement performed on the selected battery.

6. The system as specified in claim 4 wherein the present battery degradation level is determined by a chemical capacity measurement performed on the selected battery.

7. The system as specified in claim 1 wherein the battery degradation modeling data includes data indicative of a predicted degradation of the selected battery with charge/discharge cycling.

8. The system as specified in claim 7 wherein the battery degradation modeling data is a function of battery voltage.

9. The system as specified in claim 7 wherein the battery degradation modeling data is a function of battery temperature.

10. The system as specified in claim 7 wherein the battery degradation modeling data is a function of battery current.

11. The system as specified in claim 7 wherein the battery degradation modeling data is a function of battery depth of discharge.

12. The system as specified in claim 8 wherein the battery degradation modeling data is a function of predicted temperature of the selected battery as a function of being charged according to the battery charging profile.

13. The system as specified in claim 1 wherein the battery degradation modeling data comprises predicted impedance of the selected battery as a function of battery aging.

14. The system as specified in claim 13 wherein the predicted impedance is a function of battery temperature and a depth of discharge of the selected battery.

15. The system as specified in claim 13 wherein the voltage and temperature response modeling data is obtained from impedance spectra of the selected battery.

16. The system as specified in claim 1 wherein the battery charging profile is configured to establish a charging current approaching but below a value that would cause onset of active material plating effects of the selected battery as a function of present battery temperature and battery depth of discharge.

17. The system as specified in claim 1 wherein the battery degradation modeling data includes predicted active material plating effects of the selected battery as a function of charging current rate, temperature and state of charge.

18. The system as specified in claim 17 , where active material plating effects of the selected battery are modeled using parameters obtained from impedance spectra of the selected battery.

19. The system as specified in claim 17 , where active material plating effects of the selected battery are modeled using a non-linear equivalent circuit of the selected battery.

20. The system as specified in claim 1 wherein the selected battery is a Lithium ion type battery, and the battery degradation modeling data is indicative of Lithium plating effects on the selected battery as a function of charge current rate, state of charge, battery temperature or battery age.

21. The system as specified in claim 1 wherein the battery charging profile is non-linear.

22. The system as specified in claim 1 wherein the battery charging profile comprises a plurality of CC/CV (constant current/constant voltage) profiles.

23. The system as specified in claim 1 wherein the parameters are a function of a cell type of the selected battery.

24. The system as specified in claim 1 wherein the system comprises memory comprising a plurality of battery charging profiles.

25. The system as specified in claim 1 further comprising a battery charger responsively coupled to the controller.

26. A system configured to facilitate charging of a battery, comprising:
a controller configured to control a battery charger for charging a selected battery, the controller configured to process a plurality of charging profile parameters to determine a battery charging profile configured to control the battery charger;
wherein the battery charging profile is configured to minimize degradation of the selected battery for a given charge time, wherein a minimization is achieved through battery degradation modeling data indicative of a battery degradation level of the selected battery, and voltage and temperature response modeling data indicative of predicted battery voltage and temperature of the selected battery as a function of time and charging current;
wherein the battery degradation modeling data is a function of battery voltage, battery temperature, battery current, battery depth of discharge, predicted impedance of the selected battery as a function of battery aging, predicted temperature of the selected battery as a function of being charged according to the battery charging profile, wherein the battery charging profile is configured to establish a charging current approaching but below a value that would cause onset of material plating effects of the selected battery.

27. A method charging of a battery, comprising:
a controller controlling a battery charger for charging a selected battery, the controller configured to process a plurality of charging profile parameters to determine a battery charging profile configured to control the battery charger;
wherein the battery charging profile minimizes degradation of the selected battery for a given charge time using battery degradation modeling data indicative of a battery degradation rate of the selected battery, and voltage and temperature response modeling data indicative of predicted battery voltage and temperature of the selected battery as a function of time and charging current.

28. The method of claim 27 wherein the battery degradation modeling data is a function of battery voltage, battery temperature, battery current, battery depth of discharge, predicted impedance of the selected battery as a function of battery aging, predicted temperature of the selected battery as a function of being charged according to the battery charging profile, wherein the battery charging profile is configured to establish a charging current approaching but below a value that would cause onset of material plating effects of the selected battery.

Assignees

• Texas Instruments Inc

Inventors

• Barsukov Yevgen
• Wong Sai Bun Samuel
• Alongi Brian

Classifications

• H02J7/445 Primary

  in response to measured battery parameters, e.g. voltage, current or temperature profile · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/977 Primary

  of the battery · CPC title

• H01M10/052

  Li-accumulators · CPC title