Rechargeable battery pack with identification circuit, real time clock and authentication capability

• US 5,608,306 A
• Filed: 03/15/1994
• Issued: 03/04/1997
• Est. Priority Date: 03/15/1994
• Status: Expired due to Term

• Current Assignee: Ericsson GE Mobile Communications Inc (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Holmqvist, Peter, Rybeck, Nils R. C., Hansson, Magnus
• Primary Examiner(s): NAPPI, ROBERT E
• Application Number:
  US08/213,073
• Time in Patent Office: 1,085 Days
• Field of Search: 320/15, 320/2, 320/30, 429/61
• US Class Current: 320/106
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00038 using passive battery identification means, e.g. resistors or capacitors identification by mechanical connections H02J7/0045
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: Y10S 320/21 State of charge of battery

Abstract

An apparatus is provided for identifying an individual battery pack includes at least one resistor having a particular resistance value and a supervising unit for reading the particular resistance value of the at least one resistor to determine the individual identity of the battery. A clock is provided which is used to determine the remaining useful life of the battery. Recharging is selectively allowed or prevented, depending on the identify and the remaining useful life. Additionally, the authenticity of the battery pack can be verified by using a random number used as a variable in a mathematical formula stored in the application circuit and the battery and comparing the result of the calculation.

Claims

1. An apparatus for identifying an individual battery pack, comprising:

at least one resistor having a particular resistance value;

a supervising unit for reading the particular resistance value of said at least one resistor to determine the individual identity of the battery pack;

means for controlling a recharging operation of said battery pack responsive to said supervising unit, said means for controlling comprising means for determining remaining useful life of said battery pack depending on a number of charging cycles performed on said battery pack identified by said supervising unit and a level of discharging of said battery pack at each discharging cycle;

circuit means connected to said battery pack for allowing recharging of said battery pack; and

means for short-circuiting said circuit means to prevent said battery pack from being recharged responsive to said means for determining.

2. The apparatus according to claim 1, further comprising means for informing a user that the useful life of said battery pack is approaching an end or is over responsive to said means for determining.

3. The apparatus according to claim 2, wherein said means for informing comprises one of a light signal, a display, or an audio signal.

4. The apparatus according to claim 1, further comprising means for preventing further recharging cycles of the identified battery pack, if the useful life of said battery pack is approaching an end or has ended, responsive to said means for determining.

5. The apparatus according to claim 1, further comprising means for indicating to a user that the useful life of said battery pack is approaching an end or has ended responsive to said circuit means being short-circuited.

6. An apparatus for controlling recharging of an individual battery pack comprising:

means for identifying an individual battery pack;

supervising means for selectively allowing and preventing recharging of said individual battery pack responsive to said means for identifying, said supervising means comprising means for determining remaining useful life of said battery pack depending on a number of charging cycles performed on said battery pack identified by said means for identifying and a level of discharging of said battery pack at each discharging cycle;

circuit means connected to said battery pack for allowing recharging of said battery pack; and

means for short-circuiting said circuit means to prevent said battery pack from being recharged responsive to said means for determining.

7. The apparatus according to claim 6, wherein said means for identifying comprises:

at least one resistor having a particular resistance value; and

wherein said supervising means reads the particular resistance value of said at least one resistor to determine the identity of the battery pack and selectively allows or prevents recharging depending on said identity and remaining useful life of said identified battery pack.

8. The apparatus according to claim 6, wherein said means for identifying comprises:

an individual pattern printed on a surface of said battery pack; and

wherein said supervising means reads the particular pattern printed on said battery pack to determine the identity of the battery pack and selectively allows or prevents recharging depending on said identity and remaining useful life of said identified battery pack.

9. The apparatus according to claim 8, wherein said pattern is printed using resistive ink.

10. The apparatus according to claim 6, further comprising means, responsive to said means for determining, for informing a user that the useful life of said battery pack is approaching an end or is over.

11. The apparatus according to claim 10, wherein said means for informing comprises one of a light signal, a display, or an audio signal.

12. The apparatus according to claim 6, wherein said means for short-circuitry prevents further recharging cycles of the identified battery if the useful life of said battery pack is approaching an end or is over.

13. The apparatus according to claim 6, further comprising means for indicating to a user that the useful life of said battery pack is approaching an end or has ended, responsive to said circuit means being short-circuited.

14. The apparatus according to claim 6, wherein said supervising means comprises:

memory means for storing charging status of said battery pack;

means for signalling said charging status to said memory means.

15. The apparatus according to claim 14, wherein said means for signalling is provided in said battery pack.

16. The apparatus according to claim 14, wherein said means for signalling is provided in a charging circuit.

17. The apparatus according to claim 14, wherein said means for signalling signals a change in said charging status every time said battery pack is connected to a charging circuit.

18. The apparatus according to claim 14, wherein said means for signalling signals a change in said charging status as a function of total charge which is given to said battery pack at every charge period.

19. The apparatus according to claim 18, wherein said function is current times time.

20. The apparatus according to claim 14, wherein said memory means comprises a non-volatile memory.

21. The apparatus according to claim 14, wherein said memory means comprises a volatile memory requiring a small amount of current such that said battery pack can supply power to said memory means regardless of the charging condition of said battery pack.

22. The apparatus according to claim 14, wherein said memory means comprises a volatile memory connected to an external power source.

23. The apparatus according to claim 18, wherein said memory means comprises a volatile memory connected to an external power source.

24. The apparatus according to claim 14, wherein said means for signalling signals a change in said charging status every time said battery pack is connected to a discharging circuit.

25. The apparatus according to claim 6, further comprising:

a real-time clock provided in said battery pack; and

means for providing real-time clock information from said real-time clock to an application circuit to which said battery pack is connected.

26. The apparatus according to claim 25, wherein said means for providing comprises:

first pin means provided on said battery pack; and

second pin means provided on said application circuit adapted to be connected to said first pin means.

27. The apparatus according to claim 25, further comprising means for entering time and date information to said real-time clock.

28. The apparatus according to claim 25, further comprising means provided in said application circuit for shutting off said application circuit responsive to said real-time clock.

29. The apparatus according to claim 25, wherein said supervising means comprises means for controlling recharging of said battery pack using said real-time clock.

30. The apparatus according to claim 25, further comprising a display provided on said battery pack for displaying time and date information.

31. The apparatus according to claim 25, further comprising alarm circuit means provided in said battery pack for setting off an alarm at a predetermined time.

32. The apparatus according to claim 25, further comprising a control panel for entering said predetermined time into said alarm circuit means.

33. The apparatus according to claim 32, wherein said control panel is provided in said battery pack.

34. The apparatus according to claim 32, wherein said control panel is provided in said application circuit.

35. The apparatus according to claim 31, wherein said alarm circuit means is selected from one of an audio alarm, a vibrating alarm, and a visual alarm.

36. The apparatus according to claim 6, further comprising:

means for verifying the authenticity of a battery pack which has been connected to an application circuit; and

means for placing said application circuit in an non-operational state responsive to said means for verifying.

37. The apparatus according to claim 36, wherein said means for verifying comprises:

means for storing a predetermined mathematical formula provided in said battery pack and in said application circuit;

means for generating a random number;

means for calculating a first result of said mathematical formula in said battery pack using said random number;

means for calculating a second result of said mathematical formula in said application circuit using said random number;

means for comparing said first result to said second result and outputting a verification signal; and

wherein said means for placing places said application circuit in the non-operational state when said verification signal indicates that said first result does not equal said second result.

38. The apparatus according to claim 37, further comprising means for indicating that said battery pack is not authentic when said verification signal indicates that said first result does not equal said second result.

39. The apparatus according to claim 38, wherein said application circuit is a recharging circuit.

40. An apparatus for controlling an operational state of an application circuit, said apparatus comprising:

means for verifying the authenticity of a battery pack which has been connected to an application circuit, said means for verifying comprising;

means for storing a predetermined mathematical formula provided in said battery pack and in said application circuit;

means for generating a random number;

means for calculating a first result of said mathematical formula in said battery pack using said random number;

means for calculating a second result of said mathematical formula in said application circuit using said random number; and

means for comparing said first result to said second result and outputting a verification signal;

said apparatus further comprising means for placing said application circuit in an non-operational state responsive to said means for verifying when said verification signal indicates that said first result does not equal said second result.

41. The apparatus according to claim 40, further comprising means for indicating that said battery pack is not authentic when said verification signal indicates that said first result does not equal said second result.

42. The apparatus according to claim 41, wherein said application circuit is a recharging circuit.