Modular device for protecting and monitoring a battery

• US 8,793,087 B2
• Filed: 09/21/2011
• Issued: 07/29/2014
• Est. Priority Date: 10/08/2010
• Status: Active Grant

• Current Assignee: STMicroelectronics SA (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Inventors: Librizzi, Fabrizio
• Primary Examiner(s): Charioui, Mohamed
• Assistant Examiner(s): KUAN, JOHN CHUNYANG
• Application Number:
  US13/238,238
• Publication Number:
  US 20120089352A1
• Time in Patent Office: 1,042 Days
• Field of Search: 702/63, 320/116, 324/522, 340/636.1, 340/636.15, 340/636.18
• US Class Current: 702/63
• 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: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]

Abstract

A modular device having at least one master integrated circuit, and one or more slave integrated circuit modules coupled to the at least one master integrated circuit with each slave integrated circuit module of the one or more slave integrated circuit modules coupled to and associated with only a single cell of the battery. Each slave integrated circuit module of the one or more slave integrated circuit modules further comprises: detection circuitry adapted to detect data comprising one or more of the temperature, voltage or charge status, and malfunctioning of the single cell associated with and monitored by the slave integrated circuit; and an interface operable to send said detected data to the at least one master integrated circuit. The at least one master integrated circuit is adapted to send commands to a slave integrated circuit module in response to the detected data detected by the slave integrated circuit module.

Claims

1. A modular device for protecting and monitoring a battery, said battery having a plurality of cells, the modular device comprising:

at least one master integrated circuit; and

a sequence of slave integrated circuit modules coupled to the at least one master integrated circuit with each slave integrated circuit module of the sequence of slave integrated circuit modules configured to couple to and be associated with a cell of the plurality of cells of the battery and with each slave integrated circuit module of the sequence of slave integrated circuit modules comprising;

detection circuitry adapted to detect data comprising one or more of the temperature, voltage or charge status, and malfunctioning of a first cell of the plurality of cells;

a VCN input terminal operable to electrically couple to the first cell of the plurality of cells to provide a first voltage value corresponding to a negative voltage value of the first cell;

a VCP input terminal operable to electrically couple to the first cell of the plurality of cells to provide a second voltage value corresponding to a positive voltage value of the first cell and a negative voltage value of an adjacent cell of the plurality of cells, enabling the voltage of the first cell to be monitored by the first slave integrated circuit;

a VCPP input terminal operable to electrically couple with the adjacent cell of the plurality of cells to provide a third voltage value corresponding to a positive voltage value of the adjacent cell;

and

an interface operable to send said detected data to the at least one master integrated circuit and operable to exchange detected data with an adjacent slave integrated circuit module associated with the adjacent cell in the plurality of cells, wherein the interface receives the second and third voltage values and wherein the second and third voltage values provide low and high reference voltages for signals exchanged with the adjacent slave integrated circuit module,

wherein said at least one master integrated circuit is adapted to send commands to a slave integrated circuit module in response to the detected data comprising one or more of the temperature, voltage or charge status, and malfunctioning detected by the slave integrated circuit module.

2. A modular device according to claim 1, wherein the interface of each slave integrated circuit module of the sequence of slave integrated circuit modules is configured to provide its detected data to the at least one master integrated circuit either directly or through another slave integrated circuit module of the sequence of slave integrated circuit modules, wherein the another slave integrated circuit module is associated with and configured to monitor another battery cell of the plurality of cells.

3. A modular device according to claim 2, wherein a first interface of a first slave integrated circuit module of the sequence of slave integrated circuit modules is configured to exchange detected data with said master integrated circuit and with a next slave integrated circuit module in the sequence of slave integrated circuit modules to which the first slave integrated circuit module is coupled, and with the interface of every other slave integrated circuit module in the sequence of slave integrated circuit modules configured to exchange detected data with a preceding slave integrated circuit module and with a next slave integrated circuit module in the sequence of slave integrated circuit modules.

4. A modular device according to claim 3, wherein said sequence of slave integrated circuit modules is configured so that the data detected by a last slave integrated circuit module in the sequence of slave integrated circuit modules are communicated to the first slave integrated circuit module through the chain of intermediate slave integrated circuit modules of the sequence of slave integrated circuit modules and the first slave integrated circuit module communicates said data detected by the last slave integrated circuit module to the master integrated circuit.

5. A modular device according to claim 3, wherein the interface of each slave integrated circuit module in the sequence of slave integrated circuit modules is configured to synchronize with the other interfaces of the slave integrated circuit modules and with the master integrated circuit to synchronously send data from a slave integrated circuit module to a preceding slave integrated circuit module in the sequence of slave integrated circuit modules that precedes the slave integrated circuit module or to the master integrated circuit.

6. A modular device according to claim 1, wherein said master integrated circuit comprises a microprocessor and a memory where software is installed and is executable by the microprocessor to manage the data detected by the slave integrated circuit modules, said software being adaptable to the number of slave integrated circuit modules of the sequence of salve integrated circuit modules.

7. A modular device according to claim 1, wherein two or more slave integrated circuit modules of said sequence of salve integrated circuit modules are identical to one another.

8. A modular device according to claim 1, wherein the modular device together with the battery having one or more cells comprises a battery pack.

9. A slave integrated circuit module for protecting and monitoring a cell of a plurality of cells of a battery, comprising:

a detection element adapted to detect data comprising one or more of temperature, voltage or charge status, and malfunctioning of a first cell associated with the slave integrated circuit module;

a VCN input terminal operable to electrically couple to the first cell of the plurality of cells to provide a first voltage value corresponding to a negative voltage value of the first cell;

a VCP input terminal operable to electrically couple to the first cell of the plurality of cells to provide a second voltage value corresponding to a positive voltage value of the first cell and a negative voltage value of an adjacent cell of the plurality of cells, enabling the voltage of the first cell to be monitored by the first slave integrated circuit;

a VCPP input terminal operable to electrically couple with the adjacent cell of the plurality of cells to provide a third voltage value corresponding to a positive voltage value of the adjacent cell;

and

an interface, to which the detection element is coupled, that is adapted to send said detected data to an at least one master integrated circuit, and operable to exchange detected data with an adjacent slave integrated circuit module associated with the adjacent cell in the plurality of cells, wherein the interface receives the second and third voltage values and wherein the second and third voltage values provide low and high reference voltages for signals exchanged with the adjacent slave integrated circuit module,

wherein if the slave integrated circuit module is a first slave integrated circuit module of a plurality of slave integrated circuit modules, the interface of the slave integrated circuit module sends its said detected data directly to the at least one master integrated circuit, and

if the slave integrated circuit module is not the first slave integrated circuit module of a plurality of slave integrated circuit modules, the interface of the slave integrated circuit module sends its said detected data to the first slave integrated circuit module for delivery of the detected data by the first slave integrated circuit module to the at least one master integrated circuit.

10. A slave integrated circuit module according to claim 9, wherein the interface of the slave integrated circuit module is configured to exchange data with another slave integrated circuit module in a sequence of slave integrated circuit modules to which the slave integrated circuit module is coupled, the another slave integrated circuit module associated with another cell separate from the single cell associated with the slave integrated circuit module.

11. A slave integrated circuit module according to claim 9, wherein the slave integrated circuit module is a first slave integrated circuit module of a sequence of slave integrated circuit modules and the interface of the slave integrated circuit module is configured to send the data detected by the detection element of the slave integrated circuit module to the at least one master integrated circuit and to exchange detected data with a next slave integrated circuit module in the sequence of slave integrated circuit modules that is coupled to the slave integrated circuit module.

12. A slave integrated circuit module according to claim 11, wherein the first slave integrated circuit is further configured to send detected data received from the next slave integrated circuit module in the sequence of slave integrated circuit modules to the at least one master integrated circuit.

13. A slave integrated circuit module according to claim 12, wherein the detected data received from the next slave integrated circuit module comprises data detected by one or more of the next slave integrated circuit module and one or more slave integrated circuit modules of the sequence of slave integrated circuit modules other than the next slave integrated circuit module.

14. A slave integrated circuit module according to claim 9, wherein the slave integrated circuit module is not a first slave integrated circuit module of a sequence of slave integrated circuit modules and the interface of the slave integrated circuit module is configured to send the data detected by the detection element of the slave integrated circuit module to a next slave integrated circuit module in the sequence of slave integrated circuit modules to which the slave integrated circuit module is coupled for delivery of the detected data to the at least one master integrated circuit.

15. A slave integrated circuit module according to claim 14, wherein the next slave integrated circuit module is the first slave integrated circuit module.

16. A slave integrated circuit module according to claim 14, wherein the slave integrated circuit module is not a first slave integrated circuit module and the slave integrated circuit module and the next slave integrated circuit module are intermediate slave integrated circuit modules of the sequence of slave integrated circuit modules and coupled to the first slave integrated circuit module of the sequence of slave integrated circuit modules.

17. A slave integrated circuit module according to claim 9, wherein the slave integrated circuit module is a last slave integrated circuit module of the sequence of slave integrated circuit modules and the interface of the slave integrated circuit module is configured to send data detected by the detection element of the slave integrated circuit module to a first slave integrated circuit module through a chain of intermediate slave integrated circuit modules of the sequence of slave integrated circuit modules, the first slave integrated circuit module configured to send the detected data to the at least one master integrated circuit.

18. A slave integrated circuit module according to claim 9, wherein the interface of the slave integrated circuit module is configured to synchronize with the interface of a preceding slave integrated circuit module that precedes the slave integrated circuit module in a sequence of slave integrated circuit modules to which the slave integrated circuit module is coupled and with the at least one master integrated circuit to synchronously send data from the slave integrated circuit module to the preceding slave integrated circuit module or to the master integrated circuit.

19. A slave integrated circuit module according to claim 9, further comprising:

a secondary protection circuit responsive to the second and third voltage values, the second protection circuit configured to send a signal representative of a malfunctioning cell to an output terminal when one or more of the second and third voltage values is less than a low voltage threshold, UVth, or greater than an high voltage threshold OVth.