AUTOMATIC SWITCHOVER FROM CELL VOLTAGE TO INTERCONNECT VOLTAGE MONITORING

• US 20140272497A1
• Filed: 03/15/2013
• Published: 09/18/2014
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Atieva, Inc.
• Original Assignee: Atieva, Inc.
• Inventors: Biskup, Richard J.
• Granted Patent: US 10,084,214 B2
• Time in Patent Office: Days
• US Class Current: 429/90
• 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 31/68 Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

A battery assembly is provided. The battery assembly includes a first module having a first plurality of cells and a first voltage measurement device. The battery module includes a sense wire, coupled to a voltage measurement input of the first voltage measurement device and resistively coupled to a terminal of the first plurality of cells. The battery assembly includes a second module having a second plurality of cells and being configured to couple to the first module with the terminal of the first plurality of cells coupling to a terminal of the second plurality of cells via a connector and with the sense wire coupling to the terminal of the second plurality of cells via the connector.

Claims

1. A battery cell module comprising:

a plurality of cells;

a voltage measurement device;

a sense wire coupled to an input of the voltage measurement device;

a first connector configured to couple a first terminal of the plurality of cells to a previous battery cell module via two separate conductors of the first connector, so as to make available to the previous battery cell module the first terminal of the plurality of cells as both a power connection and a first sense point;

a second connector configured to couple a second terminal of the plurality of cells to a next battery cell module and couple the sense wire to the next battery cell module, wherein the next battery cell module couples the sense wire to a second sense point; and

a resistive device coupling the sense wire and the second terminal of the plurality of cells;

wherein the first connector and the second connector are configured to couple the previous battery cell module, the battery cell module and the next battery cell module in series.

2. The battery cell module of claim 1, wherein the first terminal or the second terminal is coupled to a power supply terminal of the voltage measurement device.

3. The battery cell module of claim 1, wherein the second connector includes:

a first conductor coupled to the second terminal of the plurality of cells; and

a second conductor coupled to the sense wire.

4. The battery cell module of claim 1, wherein the first sense point is located proximate to the first terminal of the plurality of cells.

5. The battery cell module of claim 1, wherein a negative terminal of the plurality of cells couples to ground of the voltage measurement device.

6. The battery cell module of claim 1, further comprising:

the voltage measurement device configured to measure a voltage of, one or more nodes of the plurality of cells, the one or more nodes being distinct from the first and second terminals.

7. A battery assembly comprising:

a first module having a first plurality of cells and a first voltage measurement device;

a sense wire, coupled to a voltage measurement input of the first voltage measurement device and resistively coupled to a terminal of the first plurality of cells; and

a second module having a second plurality of cells and being configured to couple to the first module with the terminal of the first plurality of cells coupling to a terminal of the second plurality of cells via a connector and with the sense wire coupling to the terminal of the second plurality of cells via the connector.

8. The battery assembly of claim 7, further comprising:

the terminal of the first plurality of cells being coupled to a power or ground of the first voltage measurement device.

9. The battery assembly of claim 7, further comprising:

a second voltage measurement device, included in the second module and coupled to the second plurality of cells.

10. The battery assembly of claim 7, wherein:

the connector has a first member included in the first module and a second member included in the second module;

the first member of the connector has a first conductor coupled to the terminal of the first plurality of cells;

the first member of the connector has a second conductor coupled to the sense wire;

the second member of the connector has a third conductor coupled to the terminal of the second plurality of cells; and

the second member of the connector has a fourth conductor coupled to the terminal of the second plurality of cells.

11. The battery assembly of claim 7, further comprising:

the connector or a further connector having a communication link coupling the first voltage measurement device to a second voltage measurement device of the second module.

12. The battery assembly of claim 7, wherein:

the sense wire includes a first trace on a first printed circuit board of the first module;

the first trace couples the voltage measurement input of the first voltage measurement device to the connector;

the sense wire includes a second trace on a second printed circuit board of the second module; and

the second trace couples the connector to the terminal of the second plurality of cells at a sense point proximate to the terminal of the second plurality of cells.

13. The battery assembly of claim 7, wherein:

the terminal of the first plurality of cells is a positive terminal; and

the terminal of the second plurality of cells is a negative terminal.

14. The battery assembly of claim 7, wherein:

the terminal of the first plurality of cells is a negative terminal; and

the terminal of the second plurality of cells is a positive terminal.

15. The battery assembly of claim 7, wherein the sense wire being resistively coupled to a terminal of the first plurality of cells includes a resistor coupling the sense wire to the terminal of the first plurality of cells.

16. The battery assembly of claim 7, wherein:

the first module is configured so that the first voltage measurement device can measure a voltage of the terminal of the first plurality of cells with the first module decoupled from the second module; and

the first and second modules are configured so that the first voltage measurement device can measure a voltage of the terminal of the second plurality of cells with the first module coupled to the second module.

17. A method of coupling battery modules, comprising:

resistively coupling a sense wire of a voltage measurement device to a terminal of a first set of cells, wherein a first battery module includes the voltage measurement device and the first set of cells;

coupling the terminal of the first set cells to a terminal of a second set of cells via a connector, wherein a second battery module includes the second set of cells; and

coupling the sense wire to the terminal of the second set of cells, via the connector and via the second battery module.

18. The method of claim 17, further comprising:

measuring, with the voltage measurement device and via the sense wire, a voltage of the terminal of the first set of cells prior to coupling the sense wire to the terminal of the second set of cells.

19. The method of claim 17, further comprising:

measuring, with the voltage measurement device and via the sense wire, a voltage of the terminal of the second set of cells after coupling the sense wire to the terminal of the second set of cells.

20. The method of claim 17, further comprising:

attaching a first member of the connector to the first battery module; and

attaching a second member of the connector to the second battery module, the first and second members of the connector being configured to couple to and decouple from each other.