Method and system for charging batteries with improved cycle life

• US 20060226812A1
• Filed: 03/30/2005
• Published: 10/12/2006
• Est. Priority Date: 03/30/2005
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Patino, Joseph, Simpson, Russell L.
• Application Number:
  US11/093,631
• Publication Number:
  US 20060226812A1
• Time in Patent Office: Days
• US Class Current: 320/128
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0071 with a programmable schedule

Abstract

A battery charging method (20) can include the steps of setting (20) a maximum charge voltage for a battery (104) and dynamically adjusting (38) the maximum charge voltage for the battery based on at least one among an amount of time the battery is maintained at the maximum charge voltage and an amount of cycles the battery is charged to the maximum charge voltage. The method can further include the step of measuring (36) a temperature of the battery and further dynamically adjusting (38) the maximum charge voltage for the battery based on the temperature of the battery, and/or timer value and/or counter value. Furthermore, the method can also include the step of updating (130) at least one among a counter and a timer each time after a charge is complete.

Claims

1. A battery charging method, comprising the steps of:

determining that a battery is attached to a batters charger;

setting a maximum charge voltage for the battery; and

dynamically adjusting the maximum charge voltage for the battery while the batter is attached to the battery charger based on at least one among an amount of time the battery is maintained at the maximum charge voltage while attached to the battery charger and an amount of cycles the battery is charged to the maximum charge voltage while attached to the battery charger.

2. The method of claim 1, wherein the method further comprises the step of measuring a temperature of the battery while the battery is attached to the battery charger.

3. The method of claim 2, wherein the step of dynamically adjusting further comprises the step of dynamically adjusting the maximum charge voltage for the battery while the battery is attached to the battery charger in response to the temperature of the battery.

4. The method of claim 3, wherein the method further comprises the step of maintaining the battery at an acceptable charge level below the maximum charge voltage while minimizing cycle life effects of elevated voltage and temperature.

5. The method of claim 1, wherein the method further comprises the steps of:

setting to zero one among a counter and a timer; and

thereafter setting a threshold for the one among a counter and a timer that has been set to zero.

6. The method of claim 5, wherein the wherein the step of setting to zero comprises the step of clearing at least the one among the counter and the timer in response to one among the battery being removed from the battery charger and determining that the battery is attached to the battery charger.

7. The method of claim 1, wherein the method further comprises the step of updating at least one among a counter and a timer each time the battery is charged to the maximum charge voltage while attached to the battery charger.

8. A battery charging method, comprising the steps of:

setting a maximum charge voltage for a battery;

setting a threshold for at least one among a timer and a counter;

setting the at least one among the timer and the counter to zero for each time that the battery is coupled to a battery charger;

charging the battery to the maximum charge voltage;

incrementing the at least one among the timer and the counter when charging of the battery is complete;

repeating the charging and the incrementing steps while the battery is coupled to the battery charger in response to a battery voltage for the battery falling below a recharge voltage threshold and the at least one among the timer and the counter failing to exceed the threshold; and

adjusting the maximum charge voltage and repeating the charging and the incrementing steps while the battery is coupled to the batten charger in response to the battery voltage for the battery falling below the recharge voltage threshold and the at least one among the timer and the counter exceeding the threshold.

9. The method of claim 8, wherein the step of adjusting and repeating comprises the steps of, in response to the battery voltage falling below the recharge voltage threshold and the at least one among the timer and the counter exceeding the threshold:

measuring a temperature of the battery;

adjusting the maximum charge voltage; and

repeating the charging and the incrementing steps while the battery is coupled to the battery charger.

10. The method of claim 9, wherein the step of adjusting the maximum charge voltage comprises the step of adjusting the maximum charge voltage in response to a value of the at least one of the timer or the counter and the temperature measured.

11. The method of claim 8, wherein the step of adjusting and repeating comprises the step of adjusting the maximum charge voltage in accordance with a value of the at least one among the timer or the counter in response to the battery voltage falling below the recharge voltage threshold and the value of the at least one among the timer and the counter exceeding the threshold.

12. The method of claim 8, wherein the step of setting the at least one among the timer and the counter to zero comprises the step of clearing the at least one among the timer and the counter in response to detecting when the battery is coupled to the battery charger.

13. A battery charging system, comprising:

a charger coupleable to a battery;

at least one among a timer and a counter; and

a processor coupled to the at least one among the timer and the counter and coupleable to the charger, wherein the processor is programmed to;

detecting when the charger is coupled to the battery;

set a maximum charge voltage for the battery; and

dynamically adjust the maximum charge voltage for the battery in response to at least one among an amount of time the battery is maintained at the maximum charge voltage while coupled to the charger and an amount of cycles the battery is charged to the maximum charge voltage while coupled to the charger.

14. The battery charging system of claim 13, wherein the processor is further programmed to measure a temperature of the battery.

15. The battery charging method of claim 14, wherein the processor is further programmed to measure the temperature in response to the at least one among the timer and the counter exceeds a threshold value.

16. The battery charging system of claim 14, wherein the processor is further programmed to dynamically adjust the maximum charge voltage for the battery in response to the temperature of the battery measured.

17. The battery charging system of claim 16, wherein the processor is further programmed to maintain the battery at an acceptable charge level below the maximum charge voltage while minimizing cycle life effects of elevated voltage and temperature.

18. The battery charging system of claim 14, wherein the processor is further programmed to dynamically adjust the maximum charge voltage in response to at least one among a value of the timer, a value of the counter and the temperature measured.

19. The battery charging system of claim 13, wherein the processor is further programmed to clear the at least one among the timer and the counter in response to the processor detecting that the charger has coupled to the battery.

20. The battery charging system of claim 13, wherein the processor is further programmed to:

detecting when the charger is uncoupled from the battery; and

clearing the at least one among the timer and the counter in response to the processor detecting that the charger has been uncoupled from the battery.