Secondary battery control apparatus and control method

• US 20070018608A1
• Filed: 10/13/2004
• Published: 01/25/2007
• Est. Priority Date: 10/29/2003
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Okumura, Motoyoshi
• Granted Patent: US 7,479,761 B2
• Time in Patent Office: Days
• US Class Current: 320/104
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/56 Temperature prediction, e.g. for pre-cooling
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: H02J 7/1446 in response to parameters of a vehicle
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A battery ECU executes a program that includes the steps of: sensing a vehicle speed; sensing a battery temperature; calculating a battery SOC; calculating, based on the battery temperature and battery SOC, a vehicle speed threshold value for starting charge limiting control; and setting a charge limiting flag for limiting an amount of electric energy to be to be charged even before regenerative braking, if the sensed vehicle speed is higher than the calculated vehicle speed threshold value.

Claims

1. A control apparatus for a secondary battery incorporated in a vehicle, comprising:

sensing means for sensing a state quantity related to travel of said vehicle;

predicting means for predicting, ascribable to said state quantity, a degree of deterioration of said secondary battery due to charging in regenerative braking of said vehicle; and

limiting means for limiting, based on said predicted degree of deterioration, an amount of electric energy to be charged in said regenerative braking.

2. The control apparatus for a secondary battery according to claim 1, wherein

said predicting means includes means for predicting a degree of deterioration ascribable to an increase in temperature of said secondary battery.

3. The control apparatus for a secondary battery according to claim 2, wherein

said predicting means includes means for predicting said degree of deterioration to be higher as the increase in temperature of said secondary battery is predicted to be higher.

4. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing a vehicle speed of said vehicle, and

said predicting means includes means for predicting said degree of deterioration to be higher as said vehicle speed is higher.

5. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing a vehicle speed of said vehicle, and

said predicting means includes means for predicting said degree of deterioration to be high when a period during which said vehicle speed is higher than a predetermined speed lasts longer than a predetermined period.

6. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing a vehicle speed of said vehicle, and

said predicting means includes means for predicting said degree of deterioration to be high when a period during which said vehicle speed is higher than a predetermined speed continuously lasts longer than a predetermined period.

7. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing a vehicle speed of said vehicle, and

said predicting means includes means for predicting said degree of deterioration to be high when a frequency of said vehicle speed being higher than a predetermined speed is higher than a predetermined frequency.

8. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing an amount of electric energy to be charged into said secondary battery, and

said predicting means includes means for predicting said degree of deterioration to be high when a period during which said amount of electric energy to be charged is greater than a predetermined amount of electric energy lasts longer than a predetermined period.

9. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing an amount of electric energy to be charged into said secondary battery, and

said predicting means includes means for predicting said degree of deterioration to be high when a period during which said amount of electric energy to be charged is greater than a predetermined amount of electric energy continuously lasts longer than a predetermined period.

10. The control apparatus for a secondary battery according to claim 1, wherein

said sensing means includes means for sensing an amount of electric energy to be charged into said secondary battery, and

said predicting means includes means for predicting said degree of deterioration to be high when a frequency of said amount of electric energy to be charged being greater than a predetermined amount of electric energy is higher than a predetermined frequency.

11. The control apparatus for a secondary battery according to claim 1, wherein

said predicting means includes means for predicting a degree of deterioration of said secondary battery due to charging in regenerative braking of said vehicle, considering a state of said secondary battery.

12. The control apparatus for a secondary battery according to claim 1, wherein

cooling means for cooling said secondary battery is incorporated in said vehicle, and

said control apparatus further comprises control means for controlling cooling capacity of said cooling means based on said predicted degree of deterioration.

13. A control method for a secondary battery incorporated in a vehicle, comprising the steps of:

sensing a state quantity related to travel of said vehicle;

predicting, ascribable to said state quantity, a degree of deterioration of said secondary battery due to charging in regenerative braking of said vehicle; and

limiting, based on said predicted degree of deterioration, an amount of electric energy to be charged in said regenerative braking.

14. The control method for a secondary battery according to claim 13, wherein

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting a degree of deterioration ascribable to an increase in temperature of said secondary battery.

15. The control method for a secondary battery according to claim 14, wherein

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration of said secondary battery to be higher as the increase in temperature of said secondary battery is predicted to be higher.

16. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing a vehicle speed of said vehicle, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be higher as said vehicle speed is higher.

17. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing a vehicle speed of said vehicle, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be high when a period during which said vehicle speed is higher than a predetermined speed lasts longer than a predetermined period.

18. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing a vehicle speed of said vehicle, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be high when a period during which said vehicle speed is higher than a predetermined speed continuously lasts longer than a predetermined period.

19. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing a vehicle speed of said vehicle, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be high when a frequency of said vehicle speed being higher than a predetermined speed is higher than a predetermined frequency.

20. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing an amount of electric energy to be charged into said secondary battery, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be high when a period during which said amount of electric energy to be charged is greater than a predetermined amount of electric energy lasts longer than a predetermined period.

21. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing an amount of electric energy to be charged into said secondary battery, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be high when a period during which said amount of electric energy to be charged is greater than a predetermined amount of electric energy continuously lasts longer than a predetermined period.

22. The control method for a secondary battery according to claim 13, wherein

said step of sensing a state quantity includes a step of sensing an amount of electric energy to be charged into said secondary battery, and

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting said degree of deterioration to be high when a frequency of said amount of electric energy to be charged being greater than a predetermined amount of electric energy is higher than a predetermined frequency.

23. The control method for a secondary battery according to claim 13, wherein

said step of predicting a degree of deterioration of said secondary battery includes a step of predicting a degree of deterioration of said secondary battery due to charging in regenerative braking of said vehicle, considering a state of said secondary battery.

24. The control method for a secondary battery according to claim 13, wherein

a secondary battery cooling apparatus for cooling said secondary battery is incorporated in said vehicle, and

said control method further comprises a step of controlling cooling capacity of said secondary battery cooling apparatus based on said predicted degree of deterioration.

25. A control apparatus for a secondary battery incorporated in a vehicle, comprising:

a sensor sensing a state quantity related to travel of said vehicle; and

an electronic control unit predicting, ascribable to said state quantity, a degree of deterioration of said secondary battery due to charging in regenerative braking of said vehicle, and limiting, based on said predicted degree of deterioration, an amount of electric energy to be charged in said regenerative braking.

26. The control apparatus for a secondary battery according to claim 25, wherein

said electronic control unit predicts a degree of deterioration ascribable to an increase in temperature of said secondary battery.

27. The control apparatus for a secondary battery according to claim 26, wherein

said electronic control unit predicts said degree of deterioration to be higher as the increase in temperature of said secondary battery is predicted to be higher.

28. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing a vehicle speed of said vehicle, and

said electronic control unit predicts said degree of deterioration to be higher as said vehicle speed is higher.

29. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing a vehicle speed of said vehicle, and

said electronic control unit predicts said degree of deterioration to be high when a period during which said vehicle speed is higher than a predetermined speed lasts longer than a predetermined period.

30. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing a vehicle speed of said vehicle, and

said electronic control unit predicts said degree of deterioration to be high when a period during which said vehicle speed is higher than a predetermined speed continuously lasts longer than a predetermined period.

31. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing a vehicle speed of said vehicle, and

said electronic control unit predicts said degree of deterioration to be high when a frequency of said vehicle speed being higher than a predetermined speed is higher than a predetermined frequency.

32. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing an amount of electric energy to be charged into said secondary battery, and

said electronic control unit predicts said degree of deterioration to be high when a period during which said amount of electric energy to be charged is greater than a predetermined amount of electric energy lasts longer than a predetermined period.

33. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing an amount of electric energy to be charged into said secondary battery, and

said electronic control unit predicts said degree of deterioration to be high when a period during which said amount of electric energy to be charged is greater than a predetermined amount of electric energy continuously lasts longer than a predetermined period.

34. The control apparatus for a secondary battery according to claim 25, wherein

said sensor includes a sensor sensing an amount of electric energy to be charged into said secondary battery, and

said electronic control unit predicts said degree of deterioration to be high when a frequency of said amount of electric energy to be charged being greater than a predetermined amount of electric energy is higher than a predetermined frequency.

35. The control apparatus for a secondary battery according to claim 25, wherein

said electronic control unit predicts a degree of deterioration of said secondary battery due to charging in regenerative braking of said vehicle, considering a state of said secondary battery.

36. The control apparatus for a secondary battery according to claim 25, wherein

a cooling fan for cooling said secondary battery is incorporated in said vehicle, and

said electronic control unit controls cooling capacity of said cooling fan based on said predicted degree of deterioration.