Systems and methods to capture and utilize temperature information in a battery system

Patent metadata

Field	Value
Publication number	US-9417270-B2
Application number	US-201313736803-A
Country	US
Kind code	B2
Filing date	Jan 8, 2013
Priority date	Jan 8, 2013
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

Disclosed herein are various systems and methods for capturing and utilizing temperature information in a battery pack. An electrical measurement system may be configured to determine a subdivision electrical parameter associated with one or more subdivisions, and a thermal measurement system configured to determine and track a thermal parameter associated with one or more subdivisions. A battery model may utilize the thermal parameter and the electrical parameter to estimate a characteristic of one or more battery subdivisions. In some embodiments, the battery model may further estimate a second thermal parameter of a second subdivision based upon a location of the second subdivision within the battery pack and based on the estimated characteristic of a first subdivision. Some embodiments may further estimate a life assessment of one or more subdivisions based at least in part on the subdivision electrical parameter and the thermal parameter.

First claim

The invention claimed is:

1. A system to capture and utilize temperature information in a battery pack comprising a plurality of subdivisions, the system comprising:
a battery pack comprising a plurality of subdivisions;
an electrical measurement system in electrical communication with the battery pack and configured to determine a subdivision electrical parameter associated with a first subdivision selected from among of the plurality of subdivisions;
a thermal measurement system in thermal communication with the battery pack and configured to determine and track a thermal parameter associated with the first subdivision over a plurality of charge and discharge cycles of the battery pack; and
a battery model configured to estimate a characteristic of the first subdivision based at least in part upon the subdivision electrical parameter, the thermal parameter, and a geometry of the first subdivision, to estimate a second thermal parameter of a second subdivision based upon a location of the second subdivision within the battery pack and based on the estimated characteristic of the first subdivision and to estimate a subdivision life variation between the first subdivision and the second subdivision;
wherein the battery model comprises a Monte Carlo simulation.

2. The system of claim 1 , wherein the battery model is further configured to estimate a cell voltage polarity response of the first subdivision.

3. The system of claim 1 , wherein the thermal parameter comprises data associated with a plurality of charge and discharge cycles of the battery pack.

4. The system of claim 1 , wherein the Monte Carlo simulation comprises a single cell model with a plurality of samples.

5. The system of claim 1 , wherein the characteristic comprises one of a subdivision temperature and a subdivision terminal voltage.

6. The system of claim 1 , further comprising a battery life model configured to estimate a life assessment of the first subdivision based at least in part on the subdivision electrical parameter and the thermal parameter.

7. The system of claim 1 , wherein each of the plurality of subdivisions comprises one or more battery cells.

8. The system of claim 1 , wherein the characteristic comprises a state of charge of the first subdivision.

9. The system of claim 5 , wherein the life assessment comprises one of an estimate of an increase in electrical resistance of the subdivision and a decrease in capacity of the subdivision.

10. The system of claim 5 , wherein the increase in electrical resistance comprises an annual increase and annual decrease in capacity.

11. The system of claim 8 , further comprising:
a control system configured to receive the state of charge of the first subdivision and to control discharge of the battery system based on the state of charge.

12. A method of capturing and utilizing temperature information in a battery pack comprising a plurality of subdivisions, the method comprising:
providing a battery pack comprising a plurality of subdivisions;
determining a subdivision electrical parameter associated with a first subdivision selected from among of the plurality of subdivisions;
determining and tracking a thermal parameter associated with the first subdivision over a plurality of charge and discharge cycles of the battery pack;
generating an estimate of a characteristic of the first subdivision based at least in part on the subdivision electrical parameter, the thermal parameter, and a geometry of the first subdivision; an estimate of a second thermal parameter of a second subdivision based upon a location of the second subdivision within the battery pack and based on the estimated characteristic of the first subdivision; and
estimating a subdivision life variation between the first subdivision and the second subdivision;
wherein generating the estimate of the characteristic of the first subdivision comprises using a Monte Carlo simulation.

13. The method of claim 12 , further comprising estimating a cell voltage polarity response of one or more of the first subdivision.

14. A system to capture and utilize temperature information in a battery pack comprising a plurality of subdivisions, the system comprising:
a battery pack comprising a plurality of subdivisions;
an electrical measurement system configured to determine a subdivision electrical parameter associated with a first subdivision selected from among the plurality of subdivisions;
a thermal measurement system configured to determine and track a thermal parameter associated with a subdivision over a plurality of charge and discharge cycles of the battery pack;
a battery model configured to estimate a temperature rise of the first subdivision based at least in part on a two resistor-capacitor thermal network model and a geometry of the first subdivision; and
a control system configured to receive the temperature rise of the first subdivision and to estimate a state of charge of the subdivision based at least in part on the temperature rise;
wherein the battery model comprises a Monte Carlo simulation.

Assignees

• Gm Global Tech Operatons Llc
• Gm Global Tech Operations Llc

Inventors

• Guerin John T
• Inguva Sudhakar
• Rabaa Rashed S
• Mahajan Sanjay K
• Rebba Ramesh

Classifications

• H01M10/486

  for measuring temperature · CPC title

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• G01R31/3679

  Physics · mapped topic

• G01R19/16542 Primary

  for batteries (charge condition monitoring in G01R31/36) · CPC title

• G01R31/3606

  Physics · mapped topic