System and method to reduce data handling on lithium ion battery monitors

• US 10,365,332 B2
• Filed: 09/24/2013
• Issued: 07/30/2019
• Est. Priority Date: 11/02/2012
• Status: Active Grant

• Current Assignee: Analog Devices International Unlimited Company (Analog Devices, Inc.)
• Original Assignee: Analog Devices Global Unlimited Company (Analog Devices, Inc.)
• Inventors: Gorbold, Jeremy R.
• Primary Examiner(s): Toatley, Jr., Gregory J
• Assistant Examiner(s): Becker, Brandon J
• Application Number:
  US14/034,553
• Publication Number:
  US 20140129164A1
• Time in Patent Office: 2,135 Days
• 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

Abstract

An example method to reduce data handling on lithium ion battery monitors is provided and includes receiving a request from a micro-controller for data associated with one or more cells, receiving signals corresponding to monitored properties from the cells, calculating derivative properties from the monitored properties, dividing a default data into a plurality of portions, and sending the derivative properties and one of the portions to the micro-controller according to at least a first compute logic option or a second compute logic option. The default data can include cell voltages, auxiliary inputs, stack voltage, reference output voltage, analog voltage output, analog voltage input, temperature, and reference buffer voltage. The default data is provided sequentially to the micro-controller in as many consecutive read backs as the number of portions, where each portion corresponds to the default data measured at a distinct time instant.

Claims

1. A method for reduced data handling in a battery monitoring system, comprising:

receiving, at a battery monitor communicatively coupled to a plurality of battery cells, data representative of a voltage of each of the plurality of battery cells;

determining, by the battery monitor based on the data, at least one of

     1) a minimum value of the battery cell voltages,

     2) a maximum value of the battery cell voltages, or

     3) an average value of the battery cell voltages; and

sending, by the battery monitor to a processing device, response data including at least one of

     1) the minimum value,

     2) the maximum value, or

     3) the average value, wherein the response data further includes some but not all of the battery cell voltages.

2. The method of claim 1, wherein the battery monitor sends the some but not all of the battery cell voltages sequentially to the processing device one battery cell voltage at a time in as many consecutive output events as battery cell voltages in the some but not all battery cell voltages.

3. The method of claim 1, further comprising:

monitoring, by the battery monitor, at least one of

     1) auxiliary input, and

     2) cross-check parameters used to perform safety checks on the battery monitor.

4. The method of claim 3, wherein the battery monitor monitors cross-check parameters, and the cross-check parameters include at least one of a reference output voltage (V_REF), an analog voltage output (V_REGOUT), an analog voltage input (V_REGIN), or a temperature of the battery monitor.

5. The method of claim 1, wherein the battery monitor sends the response data on multiple channels.

6. The method of claim 5, wherein the battery monitor sends the response data in a single frame.

7. The method of claim 1, wherein the battery monitor receives the data representative of the voltage of each of the plurality of battery cells wirelessly.

8. The method of claim 1, wherein the battery monitor sends the response data to the processing device wirelessly.

9. One or more non-transitory computer readable media having instructions stored thereon that, when executed by one or more processing devices of a battery monitor, cause the battery monitor to:

receive data representative of a voltage of each of a plurality of battery cells communicatively coupled to the battery monitor;

determine, based on the data, at least one of

     1) a minimum value of the battery cell voltages,

     2) a maximum value of the battery cell voltages, or

     3) an average value of the battery cell voltages; and

send, to a processing device, response data including at least one of

     1) the minimum value,

     2) the maximum value, or

     3) the average value, wherein the response data further includes some but not all of the battery cell voltages.

10. The one or more non-transitory computer readable media of claim 9, wherein the response data includes the minimum value, the maximum value, and the average value sent in a single output event.

11. The one or more non-transitory computer readable media of claim 9, wherein the instructions are further to cause the battery monitor to send a different one of the minimum value, the maximum value, and the average value at different output events.

12. The one or more non-transitory computer readable media of claim 9, wherein the instructions that, when executed by the one or more processing devices of the battery monitor, cause the battery monitor to receive the data representative of the voltage of each of the plurality of battery cells are instructions that, when executed by the one or more processing devices of the battery monitor, cause the battery monitor to receive the data representative of the voltage of each of the plurality of battery cells wirelessly.

13. The one or more non-transitory computer readable media of claim 9, wherein the instructions that, when executed by the one or more processing devices of the battery monitor, cause the battery monitor to send the response data to the processing device are instructions that, when executed by the one or more processing devices of the battery monitor, cause the battery monitor to send the response data to the processing device wirelessly.

14. An apparatus, comprising:

a communication interface to receive data representative of a voltage of each of a plurality of battery cells, and to receive and transmit data from and to a processing device; and

control circuitry to;

receive, via the communication interface, the data representative of the voltage of each of the plurality of battery cells;

determine, based on the data, at least one of

     1) a minimum value of the battery cell voltages,

     2) a maximum value of the battery cell voltages, or

     3) an average value of the battery cell voltages; and

send, via the communication interface to the processing device, response data including at least one of

     1) the minimum value,

     2) the maximum value, or

     3) the average value, wherein the response data further includes some but not all of the battery cell voltages.

15. The apparatus of claim 14, wherein the communication interface includes a daisy chain interface to the processing device.

16. The apparatus of claim 14, wherein the control circuitry is to include voltages corresponding to different subsets of the plurality of battery cells at different output events.

17. The apparatus of claim 14, wherein the communication interface includes:

an analog-to-digital converter; and

a plurality of input pins to receive the data representative of the voltages of each of the plurality of battery cells.

18. The apparatus of claim 17, further comprising:

a multiplexer;

wherein the input pins are coupled to the multiplexer to dynamically select a battery cell for monitoring.

19. The apparatus of claim 14, wherein the communication interface includes a wireless communication interface to receive the data representative of the voltages of each of the plurality of battery cells.

20. The apparatus of claim 14, wherein the communication interface includes a wireless communication interface to send the response data.