Battery conditioning methods and apparatus

• US 4,342,954 A
• Filed: 10/01/1979
• Issued: 08/03/1982
• Est. Priority Date: 10/01/1979
• Status: Expired due to Term

• Current Assignee: 372604 BC Limited
• Original Assignee: Laser Products Corporation
• Inventors: Griffith, Gerald W.
• Primary Examiner(s): Truhe, J. V.
• Assistant Examiner(s): Moose, Richard M.
• Application Number:
  US06/080,876
• Time in Patent Office: 1,037 Days
• Field of Search: 320/2, 320/4, 320/5, 320/10, 320/11, 320/14, 320/21, 320/37, 320/38, 320/43, 320/44, 320/30
• US Class Current: 320/131
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 7/0069 Charging or discharging for charge maintenance, battery initiation or rejuvenation
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10S 320/13 Fault detection
• CPC Class Codes: Y10S 320/19 Charger status, e.g. voltmeter
• CPC Class Codes: Y10S 320/30 Plural transformers

Abstract

In an effort to condition a battery for its current supply function, the electric charge required to restore the battery from a given first level to a higher second charge level is determined. A conditioning operation is comprised of a first step of reducing an unknown electric charge in the battery to the given first level, and a second step of introducing only the determined required electric charge into the battery. The battery is conditioned by administering in sequence the first step to reduce the unknown electric charge to the given first level and the second step to restore the battery to the higher second charge level by introduction of only the determined required electric charge into the battery.

Claims

1. A method of conditioning a secondary battery, comprising in combination the steps of:

predetermining for the particular type of battery the electric charge required to restore the battery from a predetermined first level to a higher second charge level;

comprising a conditioning operation of a first step of reducing an unknown electric charge in the battery to said first level and a second step of introducing only said predetermined required electric charge into the battery by applying to the battery only a predetermined number of coulombs in said second step; and

conditioning the battery by administering to the battery in sequence said first step to reduce said unknown electric charge to said first level and said second step to restore the battery to said higher second charge level by introduction of only said predetermined required electric charge into the battery.

2. A method as claimed in claim 1, including:

accepting after said conditioning a battery lacking a charge at said first level; and

conditioning the latter battery by administering only said second step.

3. A method as claimed in claim 1, wherein:

at least said second step is inhibited after said conditioning with respect to batteries lacking a charge at said first level.

7. A method as claimed in claim 1 or 4, wherein:

said conditioning operation is energized from a source of power;

at least said second step is suspended during a failure of said power occurring after performance of part of said second step; and

said suspended second step is resumed after a return of said power and the remainder of said second step is performed to introduce said predetermined required electric charge into the battery during the sum of said part and said remainder of said second step.

8. A method as claimed in claim 7, wherein:

a memory of said performance of said part of said second step is provided; and

said memory is employed after a return of said power to assure the introduction of said predetermined required electric charge into the battery during the sum of said part and said remainder of said second step.

9. A method as claimed in claim 8, wherein:

said memory is sustained by energy from said battery during failure of power from said source.

10. A method as claimed in claim 1 or 4, wherein:

only said predetermined required electric charge is introduced into said battery by applying to the battery a predetermined charging current for only such time as to realize said predetermined quantity.

4. A method of conditioning a secondary battery, comprising in combination the steps of:

predetermining for the particular type of battery the electric charge required to restore the battery to a charged condition after discharge to a level represented by a predetermined battery voltage;

comprising a conditioning operation of a first step of discharging the battery and a second step of introducing only said predetermined required electric charge into the battery by applying to the battery only a predetermined number of coulombs in said second step; and

conditioning the battery by administering to the battery said first step to discharge the battery, monitoring the voltage of the battery during said discharge, and administering to the battery, in response to realization of said predetermined battery voltage, said second step to restore the battery to said charged condition by introduction of only said predetermined required electric charge into the battery.

5. A method as claimed in claim 4, including:

accepting after said conditioning a battery lacking said predetermined battery voltage;

providing a voltage corresponding to said predetermined battery voltage; and

administering to said battery lacking a charge at said first level only said second step in response to said provided corresponding voltage.

6. A method as claimed in claim 4, wherein:

at least said second step is inhibited after said conditioning with respect to batteries lacking said predetermined battery voltage.

11. A method of charging a secondary battery from a source of power subject to failure, comprising in combination the steps of:

predetermining the electric charge required to restore the battery to a desired charged condition;

suspending said charging during a failure of said power occurring after performance of part of said charging; and

resuming said charging after a return of said power and performing a remainder of said charging to introduce said predetermined electric charge into the battery during the sum of said part and of said remainder of the charging.

12. A method as claimed in claim 11, wherein:

a memory of said performance of said part of the charging is provided; and

said memory is employed after a return of said power to assure the introduction of said predetermined electric charge into the battery during the sum of said part and said remainder of the charging.

13. A method as claimed in claim 12, wherein:

said memory is sustained by energy from said battery during failure of power from said source.

14. A method of charging a secondary battery from a source of power subject to failure, comprising in combination the steps of:

subjecting said charging to a control operation; and

providing a continuity of said control operation after failure and return of said power, with the aid of electric energy derived from said battery during said failure of power.

15. A method as claimed in claim 14, wherein:

a memory of said control operation up to said failure of power is provided;

said memory is sustained by energy from said battery during said failure of power; and

said continuity of the control operation is established with the aid of said memory.

16. Apparatus for conditioning a secondary battery, comprising in combination:

first means in said conditioning apparatus for reducing an unknown electric charge in the battery to a predetermined first level;

second means for introducing into the battery only a predetermined number of coulombs representing an electric charge predetermined ahead of the charging cycle as required to restore the battery from said first level to a higher second charge level;

third means connected to said first and second means for connecting said first means and said second means in sequence to the battery whereby to restore the battery to said higher second charge level.

17. Apparatus as claimed in claim 16, including:

means for conditioning a battery lacking a charge at said first level by administering only said second step.

18. Apparatus as claimed in claim 16, including:

means inhibiting at least said second step with respect to batteries lacking a charge at said first level.

21. Apparatus as claimed in claim 16 or 19, wherein:

said introducing means include means for applying to the battery a predetermined charging current for such time as to realize only said required charge and means for automatically deactivating said current applying means upon attainment of said time.

22. Apparatus as claimed in claim 16 or 19, including:

means for energizing said conditioning from a source of power;

means connected to said introducing means for suspending said conditioning during a failure of said power occurring after performance of part of the introduction of said electric charge and for resuming said conditioning after a return of said power for a remainder of said conditioning; and

means connected to said introducing means for causing the introduction of said predetermined required electric charge into the battery during the sum of said part and said remainder.

23. Apparatus as claimed in claim 22, wherein:

said means for causing the introduction of said required electric charge include means for storing data of said performance of part of the introduction of said electric charge and for employing said stored data after a return of said power to assure the introduction of said predetermined required electric charge into the battery during the sum of said part and said remainder.

24. Apparatus as claimed in claim 23, including:

means connected to said data storing means for deriving energy from said battery and sustaining storage of said data with said derived energy during failure of power from said source.

19. Apparatus for conditioning a secondary battery, comprising in combination:

means in said conditioning apparatus for performing a discharge operation on said battery;

means for monitoring the voltage of the battery;

means for connecting said discharge operation performing means and said monitoring means to the battery;

means connected to said monitoring means and to said discharge operation performing means for terminating said discharge operation in response to reduction of the voltage of the battery to a predetermined value;

means for introducing into the battery only an electric charge predetermined ahead of the charging cycle as required to restore the battery to a predetermined charged condition after said discharging manifested by said voltage reduction; and

means for applying said introducing means to the battery upon disconnection of said discharging means.

20. Apparatus as claimed in claim 19, wherein:

said introducing means include means for applying to the battery a predetermined number of coulombs representing said required electric charge.

25. Apparatus for charging a secondary battery from a source of power subject to failure with a predetermined electric charge, comprising in combination:

means for suspending said charging during a failure of said power occurring after performance of part of said charging and for resuming said charging for a remainder of a charging operation after a return of said power; and

means connected to said suspending and resuming means for assuring introduction of said predetermined electric charge into the battery during the sum of said part and said remainder.

26. Apparatus as claimed in claim 25, wherein:

said assuring means include means for storing data of said performance of part of said charging and for employing said stored data after a return of said power to assure introduction of said predetermined electric charge into the battery during said sum of said part and said remainder.

27. Apparatus as claimed in claim 26, including:

means connected to said storing means for deriving energy from said battery and sustaining storage of said data with said derived energy during failure of power from said source.

28. Apparatus for charging a secondary battery from a source of power subject to failure, comprising in combination:

means for subjecting said charging to a continuous control operation;

means for deriving energy from said battery during failure of said power; and

means connected to said deriving means and said subjecting means for employing said derived energy from the battery to assure the continuity of said control operating after failure and return of said power.

29. Apparatus as claimed in claim 28, wherein:

said assuring means include means for storing data of a performance of said control operation prior to failure of said power, means for sustaining storage of said data during said failure with said derived energy from the battery, and means for establishing the continuity of said control operation with the aid of said stored data after return of said power.