Variable-voltage programmable battery module

• US 5,945,806 A
• Filed: 08/29/1997
• Issued: 08/31/1999
• Est. Priority Date: 08/29/1997
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Faulk, Richard A.
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US08/921,306
• Time in Patent Office: 732 Days
• Field of Search: 320/106, 320/110, 320/112, 320/125, 320/127, 320/132, 320/136, 320/140, 320/160, 320/FOR 101, 320/FOR 104, 320/FOR 118, 320/FOR 138
• US Class Current: 320/127
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 50/296 characterised by terminals of battery packs terminals of batteries H01M50/543
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery pack which contains an integral bidirectional up/down voltage converter, so that the voltage of the battery does not have to match the voltage of the system power lines at all. Thus a single battery pack can be used in different systems which have different power bus voltages.

Claims

1. A battery pack subsystem, comprising:

one or more battery cells; and

a power converter which is connected to selectably increase or decrease the voltage applied to said battery cells during charging, and to selectably decrease or increase the voltage applied to external terminals during discharging;

said converter and said battery cells being packaged together as a single integral unit.

2. The battery pack subsystem of claim 1, wherein said power converter is a switch-mode power converter.

3. The battery pack subsystem of claim 1, wherein said power converter is controlled to maintain a predetermined voltage ratio.

4. The battery pack subsystem of claim 1, wherein said power converter is controlled to maintain a predetermined current ratio.

5. The battery pack subsystem of claim 1, wherein said power converter is controlled to maintain a predetermined transfer power.

6. A battery pack subsystem, comprising:

one or more battery cells; and

a power converter which is connected to maintain a programmed variable voltage ratio between said cells and external terminals, regardless of whether said cells are being charged or discharged through said external terminals;

said power converter and said battery cells being packaged together as a single integral unit.

7. The battery pack subsystem of claim 6, wherein said power converter is a switch-mode power converter.

8. The battery pack subsystem of claim 6, wherein said power converter is controlled to maintain a predetermined voltage ratio.

9. The battery pack subsystem of claim 6, wherein said power converter is controlled to maintain a predetermined current ratio.

10. The battery pack subsystem of claim 6, wherein said power converter is controlled to maintain a predetermined transfer power.

11. A method for operating a portable electronic system, comprising the step of:

connecting the power output terminals of a detachable battery module directly to a power bus which powers integrated circuits including programmable logic, with voltage regulation being performed on the battery side of said output terminals.

12. A method for operating a portable electronic system, comprising the steps of:

(a.) connecting the power input/output terminals of a detachable battery module directly to a power bus which powers, at a first voltage, integrated circuits including programmable logic;

(b.) transferring power from said power bus to said detachable battery module at a voltage which is greater than said first voltage;

wherein any voltage regulation is performed on the battery side of said input/output terminals.

13. An electronic system, comprising:

a power bus which is connected to supply power to one or more electronic components at a first voltage;

a power supply which is connected to supply power to said power bus;

a rechargeable battery module, including a set of one or more rechargeable electrochemical cells which are connected to achieve a second voltage when fully charged;

said second voltage being larger in magnitude than said first voltage; and

voltage conversion circuitry which is connected to transfer power from said power bus to said cells at a voltage which is greater than said first voltage.

14. The electronic system of claim 13, wherein said voltage conversion circuitry is a switch-mode power converter.

15. The electronic system of claim 13, wherein said voltage conversion circuitry is controlled to maintain a predetermined voltage ratio.

16. The electronic system of claim 13, wherein said voltage conversion circuitry is controlled to maintain a predetermined current ratio.

17. The electronic system of claim 13, wherein said voltage conversion circuitry is controlled to maintain a predetermined transfer power.

18. An electronic system, comprising:

a power bus which is connected to supply power to one or more electronic components at a first voltage;

a power supply which is connected to supply power to said power bus; and

a rechargeable battery module, including a set of one or more rechargeable electrochemical cells, said module being connected at input/output terminals to said power bus to achieve a second voltage when fully charged;

said second voltage being larger in magnitude than said first voltage;

wherein voltage regulation is performed on the battery side of said input/output terminals.

19. A computer system, comprising:

a computer, comprising memory and a programmable processor, integrated in a common portable chassis;

a power bus which is connected to supply power to said programmable processor at a first voltage;

a power supply which is connected to supply power to said power bus;

a rechargeable battery module, including a set of one or more rechargeable electrochemical cells which are connected to achieve a second voltage when fully charged;

said second voltage being larger in magnitude than said first voltage; and

voltage conversion circuitry which is connected to transfer power from said power bus to said cells at a voltage which is greater than said first voltage.

20. The computer system of claim 19, wherein said voltage conversion circuitry is a switch-mode power converter.

21. The computer system of claim 19, wherein said voltage conversion circuitry is controlled to maintain a predetermined voltage ratio.

22. The computer system of claim 19, wherein said voltage conversion circuitry is controlled to maintain a predetermined current ratio.

23. The computer system of claim 19, wherein said voltage conversion circuitry is controlled to maintain a predetermined transfer power.

24. A computer system, comprising:

a computer, comprising memory and a programmable processor, integrated in a common portable chassis;

a power bus which is connected to supply power to said programmable processor at a first voltage;

a power supply which is connected to supply power to said power bus;

a rechargeable battery module, including a set of one or more rechargeable electrochemical cells which are connected at input/output terminals to achieve a second voltage when fully charged;

said second voltage being larger in magnitude than said first voltage; and

wherein voltage regulation is performed on the battery side of said input/output terminals.