System and method for assessing voltage threshold detecting circuitry within a battery pack

• US 10,067,197 B2
• Filed: 12/07/2017
• Issued: 09/04/2018
• Est. Priority Date: 02/11/2010
• Status: Active Grant

• Current Assignee: A123 Systems Incorporated
• Original Assignee: A123 Systems Incorporated
• Inventors: Firehammer, Paul W., Floros, John H.
• Primary Examiner(s): Diao, M'Baye
• Application Number:
  US15/835,345
• Publication Number:
  US 20180106870A1
• Time in Patent Office: 271 Days
• Field of Search: 324434
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: G01R 35/00 Testing or calibrating of apparatus covered by the other groups of this subclass

Abstract

Systems and methods for assessing voltage threshold detection circuitry of individual battery cells within a battery pack supplying power to a vehicle are disclosed. One example system comprises, a plurality of battery cells within a battery pack, a plurality of voltage threshold detecting circuits detecting voltage of the plurality of battery cells, a voltage of a first battery cell of the plurality of battery cells coupled to a first voltage threshold detecting circuit of the plurality of voltage threshold detecting circuits, and a network that selectively couples a second battery cell to the first voltage detecting circuit while the first battery cell is coupled to the first voltage detecting circuit.

Claims

1. A system for assessing voltage threshold detection circuitry of battery cells within a battery pack comprising:

a first battery cell and a second battery cell within a battery pack;

a voltage threshold detecting circuit with an input channel;

a first network that selectively couples the first battery cell to the input channel;

a second network that selectively couples the second battery cell to the input channel; and

a voltage applied to the input channel when the first network and second network are coupled to the input channel being greater than a voltage applied to the input channel when the first network is coupled to the input channel.

2. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 1, wherein the voltage threshold detecting circuit has multiple input channels.

3. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 2, a plurality of networks configured to selectively couple a plurality of battery cells to a plurality of input channels.

4. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 3, including a third battery cell and a third network wherein the third network selectively couples the third battery cell to the input channel and the third battery cell and first battery cell may be coupled to the input channel simultaneously.

5. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 4, including a fourth battery cell and fourth network wherein the fourth network selectively couples the fourth battery cell to the input channel and the fourth battery cell and first battery cell may be coupled to the input channel simultaneously.

6. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 3, including a third battery cell and third network and a second input channel wherein the third network selectively couples the third battery cell to the second input channel and the third battery cell and second battery cell may be coupled to the second input channel simultaneously.

7. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 3, wherein a microcontroller determines the coupling of the battery cells to the input channels.

8. A method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack comprising:

selectively coupling a first battery cell to an input channel of a voltage threshold detecting circuit via a first network; and

selectively coupling a second battery cell to the input channel via a second network such that a voltage applied to the input channel is increased, said second battery cell in a battery cell stack including the first battery cell.

9. The method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack of claim 8, wherein the voltage threshold detecting circuit is an A/D converter or a comparator.

10. The method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack of claim 8, wherein the first network includes a resistor and capacitor configured as a low pass filter.

11. The method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack of claim 8, wherein the selective coupling is based on an output of a microcontroller.

12. The method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack of claim 11, including selectively coupling a third battery cell to the input channel of a voltage threshold detecting circuit via a third network.

13. The method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack of claim 12, wherein a voltage at the input channel is greater when multiple battery cells are coupled to the input channel than when a single battery cell is coupled to the input channel.

14. The method for assessing a voltage threshold detecting circuit for a battery cell of a battery pack of claim 11, wherein the selective coupling of battery cells to the input channel is performed by switches in the networks.

15. A system for assessing voltage threshold detection circuitry of battery cells within a battery pack, comprising:

a first battery cell and a second battery cell within a battery pack;

a voltage threshold detecting circuit with an input channel;

a first network that selectively couples the first battery cell to the input channel;

a second network that selectively couples the second battery cell to the input channel;

a controller that determines the coupling of the first and second battery cells to the input channel; and

a voltage applied to the input channel when the first network and second network are coupled to the input being greater than a voltage applied to the input channel when the first network is coupled to the input.

16. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 15, wherein the voltage threshold detecting circuit has multiple input channels.

17. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 16, wherein a plurality of networks are configured to selectively couple a plurality of battery cells to a plurality of input channels.

18. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 16, wherein the selective coupling of battery cells to input channels is based on a diagnostic routine.

19. The system for assessing voltage threshold detection circuitry of battery cells within a battery pack of claim 18, wherein an output of the diagnostic routine is an indication display.

20. The system for assessing voltage threshold detection circuitry of individual battery cells within a battery pack of claim 18, wherein an output of the diagnostic routine is storing an identified network to a memory.