Electric power accumulating apparatus and electric power system

• US 5,744,936 A
• Filed: 01/24/1997
• Issued: 04/28/1998
• Est. Priority Date: 01/29/1993
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawakami, Soichiro
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US08/789,601
• Time in Patent Office: 459 Days
• Field of Search: 320/6, 320/7, 320/15, 320/16, 320/17, 320/18
• US Class Current: 320/120
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

In an electric power accumulating apparatus utilizing a parallel arrangement of plural groups of secondary batteries in which the secondary batteries of each group are arranged in series, an abnormality in each of the secondary batteries is detected. The output terminals of the secondary battery showing abnormality are electrically detached and the detached terminals to which the secondary battery showing abnormality have been connected are shortcircuited. An auxiliary power source or a DC/DC converter compensates for the voltage corresponding to the detached battery to provide improved safety, stable output and extended service life.

Claims

1. An electric power accumulating apparatus provided with a parallel arrangement of plural groups each of which includes at least one secondary battery, comprising:

means for detecting an abnormality in each secondary battery of said plural groups;

means for electrically disconnecting one of at least three terminals connecting a secondary battery showing abnormality to the group from the secondary battery showing abnormality, and for connecting the other two terminals to shunt said secondary battery showing abnormality; and

one of an auxiliary power source and DC/DC converter for compensating the voltage corresponding to said detached battery,

wherein at least one diode is provided at least at one end of each group to prevent reverse current flow.

2. An apparatus according to claim 1, wherein said auxiliary power source has a secondary battery.

3. An apparatus according to claim 1, wherein said means for detaching of the secondary battery showing abnormality, eventually with shortcircuiting of the terminals includes a switching element.

4. An apparatus according to claim 1, wherein said means for detecting abnormality of said secondary batteries is means adapted to measure the state of at least one of the voltage, current, temperature and strain of each of the secondary batteries.

5. An apparatus according to claim 1, further comprising means for requesting replacement of the secondary battery showing abnormality.

6. An apparatus according to claim 1, further comprising means for connecting, after said secondary battery showing abnormality is replaced by a normal one, the output terminals of the normal one to the battery array thereby restoring the apparatus.

7. An apparatus according to claim 1, further comprising means for informing the timing of replacement of the secondary batteries constituting said apparatus.

8. An apparatus according to claim 1, further comprising rectifying means.

9. An apparatus according to claim 1, further comprising stabilizing means for providing a stable constant voltage.

10. An apparatus according to claim 1, further comprising means for controlling charging and discharging of the apparatus.

11. An apparatus according to claim 1, further comprising an inverter for elevating the output voltage and converting the output current into an AC current.

12. An apparatus according to claim 1, further comprising noise eliminating means.

13. An apparatus according to claim 1, further comprising means for displaying the amount of accumulated electricity.

14. An apparatus according to claim 1, further comprising a DC-DC converter.

15. An apparatus according to claim 1, wherein said secondary batteries are selected from a group consisting of lithium battery, nickel-zinc battery, air-zinc battery, bromine-zinc battery and silver oxide-zinc battery.

16. An apparatus according to claim 1, wherein said secondary batteries are unit batteries of a substantially same capacity.

31. An electric power system according to claim 1, wherein said secondary batteries are selected from a group consisting of lithium battery, nickel-zinc battery, air-zinc battery, bromine-zinc battery and silver oxide-zinc battery.

33. An apparatus according to claim 1, wherein said DC/DC converter is a booster circuit.

34. An apparatus according to claim 1, wherein plural secondary batteries are arranged in series in each of said groups.

35. An apparatus according to claim 1, wherein said at least one diode comprises a diode connected so as to be forwardly biased by a discharge current for each group at a discharge mode, and a diode connected so as to be forwardly biased by charging current for each group at a charging mode.

36. An apparatus according to claim 1 wherein the DC-DC converter has a voltage elevating circuit.

37. An apparatus according to claim 1 wherein said means for electrically disconnecting includes a switching element of a relay.

38. An apparatus according to claim 1 wherein said means for electrically disconnecting comprises a latching relay.

39. An apparatus according to claim 1 wherein said means for electrically disconnecting includes a two-coil type latching relay.

40. An apparatus according to claim 1 wherein said means for electrically disconnecting includes a switching element comprising a transistor.

41. An apparatus according to claim 1 wherein said means for electrically disconnecting includes a switching element comprising a thyristor.

17. An electric power system including a power source apparatus provided with a parallel arrangement of groups each of which includes at least one secondary battery, and a load electrically connected to said power source apparatus,

wherein said power source apparatus comprises:

means for detecting an abnormality in each secondary battery of the groups;

means for electrically disconnecting one of at least three terminals connecting a secondary battery showing abnormality to the group from the secondary battery showing abnormality and, for connecting the other two terminals to shunt said secondary battery showing abnormality; and

one of an auxiliary power source and a DC/DC converter for compensating the voltage corresponding to said detached battery, and

wherein at least one diode is provided at least at one end of each group to prevent reverse current flow.

18. An electric power system according to claim 17, wherein said auxiliary power source has a secondary battery.

19. An electric power system according to claim 17, wherein said means for detaching the secondary battery showing abnormality, eventually with shortcircuiting of the terminals includes a switching element.

20. An electric power system according to claim 17, wherein said means for detecting abnormality of said secondary batteries is means adapted to measure the state of at least one of the voltage, current, temperature and strain of each of the secondary batteries.

21. An electric power system according to claim 17, further comprising means for requesting replacement of the secondary battery showing abnormality.

22. An electric power system according to claim 17, further comprising means for connecting, after said secondary battery showing abnormality is replaced by a normal one, the output terminals of the normal one to the battery array thereby restoring the apparatus.

23. An electric power system according to claim 17, further comprising means for informing the timing of replacement of the secondary batteries constituting said apparatus.

24. An electric power system according to claim 17, further comprising rectifying means.

25. An electric power system according to claim 17, further comprising stabilizing means for providing a stable constant voltage.

26. An electric power system according to claim 17, further comprising means for controlling charging and discharging of said apparatus.

27. An electric power system according to claim 17, further comprising an inverter for elevating the output voltage and converting the output current into an AC current.

28. An electric power system according to claim 17, further comprising noise eliminating means.

29. An electric power system according to claim 17, further comprising means for displaying the amount of accumulated electricity.

30. An electric power system according to claim 17, further comprising a DC-DC converter.

32. An electric power system according to claim 17, wherein said secondary batteries are unit batteries of a substantially same capacity.

42. An apparatus according to claim 17 wherein plural secondary batteries are arranged in series in each of said groups.

43. An apparatus according to claim 17, wherein said at least one diode comprises a diode connected so as to be forwardly biased by a discharge current for each group at a discharge mode, and a diode connected so as to be forwardly biased by charging current for each group at a charging mode.

44. An apparatus according to claim 17 wherein the DC-DC converter has a voltage elevating circuit.

45. An apparatus according to claim 17 wherein said means for electrically disconnecting comprises a switching element of a relay.

46. An apparatus according to claim 17 wherein said means for electrically disconnecting includes a latching relay.

47. An apparatus according to claim 17 wherein said means for electrically disconnecting includes a two-coil type latching relay.

48. An apparatus according to claim 17 wherein said means for electrically disconnecting includes a switching element comprising a transistor.

49. An apparatus according to claim 17 wherein said means for electrically disconnecting includes a switching element comprising thyristor.