Intelligent Adaptive Energy Management System and Method for Using

• US 20100164430A1
• Filed: 01/14/2009
• Published: 07/01/2010
• Est. Priority Date: 12/31/2008
• Status: Abandoned Application

• Current Assignee: Vbi 2000, LLC
• Original Assignee: Vbi 2000, LLC
• Inventors: ZOU, PENGCHENG, LU, CUI, NASH, DALLAS LEE II
• Application Number:
  US12/353,715
• Publication Number:
  US 20100164430A1
• Time in Patent Office: Days
• US Class Current: 320/103
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: H02J 7/00711 with introduction of pulses during the charging process
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An intelligent adaptive energy management system and method that manages the charge and discharge process as well as the environmental quality of the energy resource to maximize its safety and its energy output. The system includes multiple features that may be used alone or in combination. One feature includes one or more sensors capable of measuring various characteristics of the battery cells and their environment such as cell temperature, rate of rise in cell temperature, cell voltage, cell density, cell internal resistance and cell shape deformation. The sensors communicate the measured data to a controller which controls activities such as cell charging, cell discharging, cell balancing, and/or cell availability to provide energy to the device served. Another feature includes a charging module in communication with the controller adapted to provide varying types and/or durations and/or amplitudes of the charge to the cells. Another feature includes a discharge system and methodology in communication with the controller that employs at least one first battery cell and at least two second battery cells adapted to work together in a complementary manner. Another feature includes an active cell balance system and methodology for balancing battery cells. Circuitry, firmware, and programmable software may be used to implement and control the above systems and methodologies to push energy resource capacity beyond its normal limits in a safe and predictable manner.

Claims

1. A battery cell management system comprising:

a cell condition monitoring unit for measuring the condition of the cell;

a charging module operatively connected to the cell adapted to selectively charge the cell; and

a control unit adapted to receive data from the cell condition monitoring unit and to control the charge produced by said charging module.

2. The system of claim 1 wherein said cell condition monitoring unit comprises a temperature sensor for sensing the temperature of the cell.

3. The system of claim 1 wherein said cell condition monitoring unit comprises a deformation sensor for sensing a change in shape of the cell.

4. The system of claim 3 wherein said deformation sensor is a strain gauge wheat stone bridge.

5. The system of claim 1 wherein said cell condition monitoring unit comprises a galvanostatic pulse detector operatively connected to the cell for monitoring the cell'"'"'s response to a galvanostatic pulse injected into the cell.

6. The system of claim 1 wherein said cell condition monitoring unit comprises a cell voltage detector for measuring the voltage across the cell.

7. The system of claim 1 wherein said cell condition monitoring unit comprises a current density detector for measuring the current density of the cell.

8. The system of claim 1 wherein said cell condition monitoring unit comprises a cell internal resistance detector for measuring the internal resistance of the cell.

9. The system of claim 1 wherein said charging module is adapted to produce a plurality of types of charges including constant, variable, and flutter.

10. The system of claim 9 wherein said charging module provides the appropriate type and duration of charged in response to conditions determined by said control unit.

11. The system of claim 1 wherein the charging module provides a first flutter charge pattern to the cells and a second flutter charge pattern to the cells and the control unit determines which flutter charge pattern provides the most effective charge to the cells.

12. The system of claim 1 further comprising a discharge control unit to safely control the discharge of the cell in response to changed conditions of the cell.

13. A battery cell balancing system for balancing voltages among a first plurality of cells using a second cell, said system comprising:

a cell condition monitoring unit for measuring the voltage of the first plurality of cells and the second cell;

a plurality of switches each having an open position where current is allowed to pass and a closed position where current is not allowed to pass, wherein one switch is located between each of the first plurality of cells and the second cell to selectively allow current to pass between any one of the first plurality of cells and the second cell;

a control unit adapted to receive data from the cell condition monitoring unit, use that data to determine whether the cells in the first plurality of cells are balanced, and control the opening and closing of the plurality of switches.

14. The system of claim 13 wherein the first plurality of cells comprises an alpha battery cell and a beta battery cell and the alpha battery cell has a higher charge than the beta battery cell.

15. The system of claim 14 wherein the alpha battery cell from the first plurality of cells is used to charge said second cell, then said second cell is used to charge the beta battery cell from the first plurality of cells.

16. The system of claim 13 wherein in said first plurality of cells are Lithium polymer cells.

17. The system of claim 13 where in said second cell is a Nickel Metal Hydride cell.

18. A system for balancing battery cells comprising:

a first plurality of cells in series;

a second cell selectively in parallel with each cell in said first plurality of cells;

a charging module for selectively connecting said second cell in parallel with at least one of said cells in said first plurality of cells;

a voltage detector for detecting the voltage in each of said cells;

a controller connected to said charging module, wherein the charging module selectively connects said second cell in parallel with one of said first plurality of cells until said first plurality of cells are operatively balanced in response to an imbalance of voltage among each said first plurality of cells.

19. The system of claim 18 wherein the chemistry of said first plurality of cells is different from said second cell.

20. The system of claim 19 wherein in said first plurality of said cells are Lithium polymer cells.

21. The system of claim 19 where in said second cell is a Nickel Metal Hydride cell.

22. The system of claim 18 further comprising a cell condition monitoring unit having cell health sensors wherein said controller is adapted to calculate load data received from said sensors through said cell condition monitoring unit, wherein said calculated data is used to determine which of said cells supply the load.

23. The system of claim 22 wherein said controller is adapted to predict future conditions based on data received from said cell condition monitoring unit.

24. The system of claim 22 wherein said sensors comprise a temperature sensor for sensing the temperature of the cell.

25. The system of claim 22 wherein said sensors comprise a deformation sensor for sensing a change in shape of the cell.

26. The system of claim 25 wherein said deformation sensor is a strain gauge wheat stone bridge.

27. The system of claim 22 wherein said sensors comprise a galvanostatic pulse detector operatively connected to the cell for monitoring the response of the cell to a galvanostatic pulse injected into the cell.

28. The system of claim 22 wherein said sensors comprise a cell voltage detector for measuring the voltage across the cell.

29. The system of claim 22 wherein said sensors comprise a current density detector for measuring the current density of the cell.

30. The system of claim 22 wherein said sensors comprise a cell internal resistance detector for measuring the internal resistance of the cell.

31. The system of claim 22 further comprising a charging module, wherein said controller calculates the desired charge from current and historical cell health data and said charging module controls the charge produced by said second cell for said first plurality of cells.

32. The system of claim 31 wherein said charging module is adapted to produce a plurality of types of charges including constant, variable, and flutter in response to conditions determined by said control unit.

33. The system of claim 18 wherein the charging module provides a first flutter charge pattern to the cells and a second flutter charge pattern to the cells and the control unit determines which flutter charge pattern provides the most effective charge to the cells.

34. The system of claim 32 wherein said control unit predicts future conditions of the cell.

35. The system of claim 34 wherein said control unit controls the charge produced by said charging module in response to predicted conditions.

36. The system of claim 22 further comprising a discharge control unit to control the discharge of the cells in response to changed conditions of the cells.

37. A system for controlling battery discharge comprising:

a first battery having a plurality of cells;

a second battery having a plurality of cells in parallel with said first battery pack;

a third battery having a plurality of cells in parallel with said first and second battery pack;

a voltage detector for monitoring the voltage of each of said cells in said batteries; and

a controller for selectively rotating discharge among the first and second batteries, wherein the discharging battery is the active battery and the other battery is the idle battery, wherein as one of said first and second batteries is discharging, the idle battery is being charged by said third battery.

38. The system of claim 37 wherein said first and second batteries are Lithium based batteries.

39. The system of claim 38 wherein the third battery is a Nickel hydrate battery.

40. The system of claim 37 further comprising an active cell balance unit, wherein said voltage detector detects the voltage in each of said batteries;

and a switching unit selectively connects the idle battery in parallel with the third battery, wherein said controller is connected to said micro switch array for switching in response to an imbalance of voltage among each said first plurality of cells, wherein said controller selectively individually connects the idle cells in parallel with the cells in said third battery pack until said idle cells are operatively balanced.

41. The system of claim 37 further comprising a cell condition monitoring unit for measuring conditions in and around the cells, wherein said controller switches between said first and second batteries in response to changing conditions in said batteries.

42. The system of claim 37 wherein said controller varies the charge being produced by said third battery to the idle battery between a constant, pulse, and flutter charges.

43. A method for balancing a plurality of series connected battery cells and a selectively connected parallel battery cell comprising the steps of:

sensing a voltage of said parallel cell;

sensing voltages of said series connected cells;

recognizing the voltages of the series connected cells are not balanced;

determining whether the voltage of the parallel cell is greater than the highest voltage of the series connected cells; and

charging the series cells with the parallel cell until voltages of the series cells are substantially balanced.

44. The method of claim 43 further comprising the step of charging the parallel cell with the series cell having the highest voltage until the voltages are substantially balanced.

45. The method of claim 44 further comprising the step of charging the series cells individually with the parallel cell until voltages of the series cells are substantially balanced.

46. A method for preventing battery cell failure with an intelligent microcomputer and adaptive control logic adapted to receive cell condition data from safety sensors comprising the steps of:

storing default limits for the cell;

receiving initial data from the safety sensors and associating said data with the cell in new condition;

updating the initial data with current data from the safety sensors;

comparing said current data with said default limits;

isolating the cell before the cell enters an unsafe state.

47. The method of claim 46, wherein the step of receiving data from the safety sensors further includes the step of receiving temperature data from a thermistor.

48. The method of claim 46 wherein the step of receiving data from the safety sensors further includes the step of receiving deformation data from a strain gauge wheatstone bridge.

49. The method of claim 46 wherein the step of receiving data from the safety sensors further includes the steps of receiving decay data by measuring a response to a galvanostatic pulse injected into the cell.

50. The method of claim 46 further comprising the step of calculating internal battery cell resistance.

51. The method of claim 46 further comprising the step of projecting internal battery cell resistance.

52. A method for charging a battery cell using an intelligent microcomputer and an adaptive controller capable of storing a history of cell health data received from a plurality of sensors comprising the steps of:

measuring current cell health data with the plurality of sensors;

comparing the cell health data with historical cell health data;

calculating an optimum charge based on compared data;

sending a charge to the cell based on said calculated value; and

modifying the charge based on changing conditions of the cell.

53. The method of claim 52 wherein the step of measuring cell health data further includes the step of measuring temperature data from a thermistor.

54. The method of claim 52 wherein the step of measuring cell health data further includes the step of measuring deformation data from a strain gauge wheatstone bridge.

55. The method of claim 52 wherein the step of measuring cell health data further includes the step of measuring decay data by injecting a galvanostatic pulse into the cell.

56. The method of claim 52 wherein the step of measuring cell health data further includes the step of measuring cell voltage.

57. The method of claim 52 wherein the step of measuring cell health data further includes the step of measuring the current density of the cell.

58. The method of claim 52 wherein the step of modifying the charge further includes changing the charge from constant current to pulse charging.

59. The method of claim 52 wherein the step of modifying the charge further includes changing the charge from pulse charging to flutter charging.

60. A computer enabled method for protecting battery health comprising the steps of:

recognizing that the battery is connected to a device adapted to produce charges including constant current, pulse and flutter;

measuring battery health conditions;

predicting based on battery health conditions when the battery is going to enter unsafe conditions; and

aborting charging before the battery enters unsafe conditions.

61. A battery cell management system comprising:

a cell condition monitoring unit for measuring the condition of the cell;

a charging module operatively connected to the cell adapted to selectively charge the cell; and

a control unit adapted to receive data from the cell condition monitoring unit and use that data to determine future conditions inside the cell, said control unit also adapted to control the charge produced by said charging module in response to determined future conditions.

62. A system for controlling battery discharge comprising:

a first battery;

a second battery in parallel with said first battery pack;

a controller for selectively rotating discharge among the first and second batteries.