Method for charging a battery

• US 7,282,891 B2
• Filed: 12/30/2002
• Issued: 10/16/2007
• Est. Priority Date: 12/30/2002
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Johnson, Robert M., Smallwood, Ralph D.
• Primary Examiner(s): Tso; Edward H.
• Application Number:
  US10/334,161
• Publication Number:
  US 20040124810A1
• Time in Patent Office: 1,751 Days
• Field of Search: 320/137, 320/136, 320/134, 320/125, 320/114, 320/112, 320/106, 320/128, 320/130, 320/131, 320/132, 320/127, 320/149, 320/113
• US Class Current: 320/137
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A method and apparatus for charging a rechargeable battery (110) that takes into account the use patterns of the particular battery. A user may only discharge the battery a little and recharge it frequently which is a low capacity high life cycle use pattern, or discharge the battery almost completely and place the battery on charge less frequently indicating a high capacity low life cycle use pattern. Herein, a battery is installed in an electronic device wherein a battery discharge determination circuit and a discharge determination algorithm determine the discharge level of the battery when a charging circuit is placed on the battery. The measurement algorithm determines from the rechargeable battery discharge level measurement how to recharge the rechargeable battery. The measurement algorithm may also determine how to recharge the rechargeable battery based on a plurality of previous measurements stored either in the electronic device or the battery.

Claims

1. A method for recharging a rechargeable battery:

determining a discharge voltage of a rechargeable battery when said rechargeable battery is coupled to a charging circuit;

determining a recharge value that correlates at least to said determined discharge level; and

recharging said rechargeable battery to a first determined recharge value in response to said determined discharge voltage being greater than a predetermined discharge voltage threshold and a time from a last charge cycle to said coupling said rechargeable battery to a charging circuit is greater than a predetermined time.

2. The method of claim 1, recharging said rechargeable battery to a first determined recharge value in response to said determined discharge voltage being less than a predetermined discharge voltage threshold.

3. The method of claim 1,

recharging said rechargeable battery to a first determined recharge value in response to said determined discharge voltage being less than a predetermined discharge voltage threshold and a time frame from said last charge cycle to said coupling said rechargeable battery to a charging circuit is greater than a predetermined time.

4. The method of claim 3, recharging said rechargeable battery at a first recharge rate in response to said determined discharge voltage being greater than a predetermined discharge voltage threshold, and at a second recharge rate in response to said determined discharge voltage being less than a predetermined discharge voltage threshold.

5. A method for recharging a rechargeable battery:

coupling a rechargeable battery to a charging circuit;

determining a discharge pattern of a rechargeable battery from a plurality of previously determined discharge measurements taken upon coupling said rechargeable battery to said charging circuit; and

selecting a recharge mode based on said discharge pattern; and

recharging said rechargeable battery with said recharge mode.

6. The method of claim 5, recharging said rechargeable battery to a first voltage in response to said determined discharge pattern being a low capacity high cycle life pattern,

recharging said rechargeable battery to a second voltage in response to said determined discharge pattern being a high capacity low cycle life pattern,

recharging said rechargeable battery at a first rate in response to said determined discharge pattern being a fast charge time low cycle life pattern, or

recharging said rechargeable battery at a second rate in response to said determined discharge pattern being a short charge time high cycle life pattern.

7. The method of claim 6,

coupling said rechargeable battery to a charging circuit;

determining a discharge level of said rechargeable battery;

determining the difference between said discharge level and said determined discharge level pattern; and

recharging said rechargeable battery to a first voltage if said difference between said discharge level and said determined discharge level pattern is greater then a predetermined value, and

recharging said rechargeable battery to a second voltage if said difference between said discharge level and said determined discharge level pattern is less then a predetermined value.

8. The method of claim 7,

recharging said rechargeable battery at a first rate if said difference between said discharge level and said determined discharge level pattern is greater then a predetermined value, and

recharging said rechargeable battery at a second rate if said difference between said discharge level and said determined discharge level pattern is less then a predetermined value.

9. A method for recharging a rechargeable battery:

determining a discharge voltage of a rechargeable battery when said rechargeable battery is coupled to a charging circuit; and

determining a recharge value that correlates at least to said determined discharge level;

recharging said rechargeable battery to a first determined recharge value in response to said determined discharge voltage level being greater than a predetermined discharge voltage threshold and a time from a last charge cycle to said coupling said rechargeable battery to a charging circuit is greater than a predetermined time; and

recharging said rechargeable battery to a first determined recharge value in response to said determined discharge voltage being less than a predetermined discharge voltage threshold and a time frame from said last charge cycle to said coupling said rechargeable battery to a charging circuit is greater than a predetermined time.

10. A method for recharging a rechargeable battery:

determining a discharge voltage of a rechargeable battery when said rechargeable battery is coupled to a charging circuit;

determining a recharge value that correlates at least to said determined discharge level; and

recharging said rechargeable battery at a first recharge rate in response to said determined discharge voltage level being greater than a predetermined discharge voltage threshold, and at a second recharge rate in response to said determined discharge voltage being less than a predetermined discharge voltage threshold.

11. A method for recharging a rechargeable battery:

determining a discharge voltage of a rechargeable battery when said rechargeable battery is coupled to a charging circuit;

determining a recharge value that correlates at least to said determined discharge level;

recharging said rechargeable battery at a first rate if said difference between said discharge level and said determined discharge level pattern is greater then a predetermined value, and

recharging said rechargeable battery at a second rate if said difference between said discharge level and said determined discharge level pattern is less then a predetermined value.

12. A method for recharging a rechargeable battery:

determining a discharge level pattern of a rechargeable battery when said rechargeable battery is coupled to a charging circuit; and

determining a battery recharge method based on the determined discharge level pattern.

13. The method of claim 12,

recharging said rechargeable battery with a first battery recharge method if said determined discharge level pattern of said rechargeable battery is greater than a predetermined value, and

recharging said rechargeable battery with a second battery recharge method if said determined discharge level pattern of said rechargeable battery is less than said predetermined value.

14. The method of claim 12,

measuring a discharge level of a rechargeable battery when said rechargeable battery is coupled to a charging circuit;

and

storing each rechargeable battery discharge level as a part of the discharge level pattern.

15. The method of claim 14, determining the rechargeable battery discharge level pattern from a plurality of said rechargeable battery discharge measurements.

16. The method of claim 15, determining that said rechargeable battery discharge level pattern is a low capacity high cycle life pattern, a high capacity low cycle life pattern, fast charge time low cycle life pattern, or a short charge time high cycle life pattern.

17. The method of claim 16, recharging said rechargeable battery to a voltage level between a first voltage and a second voltage;

and preferably to a third voltage between said first voltage and said second voltage, in response to determining said battery discharge level pattern being a low capacity high cycle life pattern.

18. The method of claim 16, recharging said rechargeable battery to a voltage between 4.05 volts and 4.15 volts, preferably 4.1 volts in response to determining that said rechargeable battery discharge level pattern corresponds to a low capacity high cycle life pattern.

19. The method of claim 16, recharging said battery by applying a first current in response to determining said battery discharge level pattern to be a high capacity low cycle life pattern;

and

recharging said battery by applying a second current in response to determining said battery discharge level pattern to be a low capacity high cycle life pattern.

20. The method of claim 19, wherein the ratio of said first current to said second current is between 1.5 and 4.5 and preferably 3.0.

21. The method of claim 16, recharging said battery by applying a first current, said first current between 0.2 amps and 0.5 amps in response to determining said battery discharge level pattern to be a high capacity low cycle life pattern, and

charging said battery by applying a second current between 0.5 amps and 2.0 amps in response to determining said battery discharge level pattern being to be a low capacity high cycle life pattern.

22. The method of claim 16, recharging said battery to a voltage between a fourth voltage and a fifth voltage, preferably a sixth voltage, in response to determining said battery discharge level pattern to be high capacity low cycle life high capacity pattern.

23. The method of claim 22, recharging said battery to a voltage between 4.15 volts and 4.2 volts, preferably 4.2 volts, in response to determining said battery discharge level pattern to be high capacity low cycle life pattern.

24. The method of claim 12, further comprising:

recharging said battery with a current between a first current and a second current, preferably a third current between said first and said second current, in response to determining said battery discharge level pattern being a fast charge time low capacity pattern.

25. The method of claim 24, recharging said battery with a first current to between 0.5 amps and 2.0 amps;

and preferably 1.0 amp in response to determining that said battery discharge level pattern is a fast charge time low cycle life pattern.

26. The method of claim 24, charging said battery with a first current to between 0.2 amps and 0.5 amps;

and preferably 0.35 amps in response to determining that said battery discharge level pattern is a slow charge time high cycle life slow charge time pattern.

27. The method of claim 16, determining a rechargeable battery discharge level pattern to be a low capacity high cycle life pattern when said battery is coupled to said charging circuit when said battery has a capacity greater than a 50 percent and when the time between charge cycles is twenty four hours or less,

determining a rechargeable battery discharge level pattern to be a high capacity low cycle life pattern when said battery is coupled to said charging circuit when said battery has a capacity less than a 50 percent and when the a time between charge cycles is twenty four hours or greater;

determining a rechargeable battery discharge level pattern to be a fast charge time low cycle life pattern when a battery charge time is less than one half a full charge time for said battery,

determining a rechargeable battery discharge level pattern to be a slow charge time high cycle life pattern when a battery charge time is greater than one half a full charge time for said battery,

determining a rechargeable battery discharge level pattern to be,

a slow charge high cycle life pattern, by determining that the time from when the battery has reached a full charge to the time the battery is disconnected from the charger is greater than 60 minutes, and

a fast charge low cycle life pattern, by determining that the time from when the battery has reached a full charge to the time the battery is disconnected from the charger is less than 60 minutes.

28. The method of claim 12, storing said battery charge level value in a memory of said portable device.

29. The method of claim 12, storing said battery charge level value in a memory of a battery.

30. The method of claim 12, storing said one of a plurality of battery charge level values in a memory in response to coupling a battery to a charging device.