Battery model and control application calibration systems and methods

Patent metadata

Field	Value
Publication number	US-11527780-B2
Application number	US-201716338966-A
Country	US
Kind code	B2
Filing date	Oct 12, 2017
Priority date	Oct 12, 2016
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

One embodiment of the present disclose describes systems and methods responsible for reducing errors in a battery model used in the operation of a battery control system. The battery control system may operate based on a modeled response of the battery derived from the battery model. If the battery model is not calibrated/validated, errors in the battery model may propagate through the modeled response of the battery to the operation of the battery control system. A calibration current pulse may result in a different measured response of the battery than the modeled response of the battery to the same calibration current pulse. A validation technique, which uses a difference between the modeled response and the measured response of the battery to the calibration current pulse as a method to calibrate the battery model, may protect the battery control system from the contribution of errors from an uncalibrated battery model.

First claim

What is claimed is:

1. A system comprising:
an automotive battery system, wherein the automotive battery system comprises:
a sensor configured to determine sensor data indicative of a measured operational parameter of a battery cell in the automotive battery system; and
a battery control system communicatively coupled to the sensor, wherein the battery control system is configured to determine a measured battery state by executing a control application program based at least in part on the measured operational parameter; and

a design device communicatively coupled to the automotive battery system, wherein the design device comprises a processor programmed to:
determine a modeled operational parameter by supplying a calibration current pulse to a battery model corresponding with the battery cell;
determine the measured operational parameter by supplying a calibration current pulse to the battery cell;
determine a modeled battery state by executing the control application program based on the modeled operational parameter and the measured operational parameter; and
adjust model parameters of the battery model, the control application program, or both based at least in part on a difference between the modeled operational parameter and the measured operational parameter, difference between the modeled battery state and the measured battery state, or both.

2. The system of claim 1 , wherein the control application program comprises a state-of-function (SoF) application executable by the processor to determine a charging power limit, a discharging power limit, or both associated with the battery cell.

3. The system of claim 1 , wherein the modeled battery state or the measured battery state describes a value representing a discharge current limit of the automotive battery system, stored energy in the automotive battery system divided by a total energy storage capacity of the automotive battery system, or a capability of the automotive battery system to deliver the stored energy.

4. The system, of claim 1 , wherein characteristics of the calibration current pulse are derived from pulse characterization data during the measurement of dynamic power capability during both discharge and charge events.

5. The system of claim 1 , wherein the adjusting model parameters of the battery model comprises adjusting the model parameters based at least in part on a graphical representation of the calibration current pulse including a first current pulse and a second current pulse derived from the calibration current pulse and organized according to pulse duration time value, a current value, an initial percent charged value, and an initial temperature value.

6. The system of claim 1 , wherein the battery control system is configured to determine the measured operational parameter based at least in part on the sensor data received form the sensor.

7. The system of claim 6 , wherein the battery model comprises a resistor capacitor (RC) equivalent circuit model with one or more time variant model parameters.

8. A method for calibrating a battery control system, comprising:
determining, using a design device, a calibration current pulse;
instructing, using the design device, a battery system corresponding with the battery control system to supply the calibration current pulse to a battery pack;
determining, using the design device, a measured response of the battery pack resulting from supply of the calibration current pulse to the battery pack based at least in part on sensor data received from one or more sensors;
supplying, using the design device, the calibration current pulse to a battery model corresponding with the battery pack;
determining, using the design device, a modeled response resulting from supply of the calibration current pulse to the battery model;
adjusting, using the design device, model parameters of the battery model, a control application program used to determine the modeled response, or both when a difference between the measured response to the calibration current pulse and the modeled response to the calibration current pulse is greater than a difference threshold; and
storing, using the design device, the battery model, the control application program, or both in the battery control system to enable subsequent use during operation of the battery system when a difference between the measured response to the calibration current pulse and the modeled response to the calibration current pulse is not greater than the difference threshold.

9. The method of claim 8 , wherein determining the measured response of the battery pack comprises executing the control application program based at least in part on the sensor data.

10. The method of claim 8 , wherein determining the modeled response comprises:
determining a parameter resulting from supply of the calibration current pulse to the battery model;
determining the modeled response by executing the control application program based at least in part on the parameter; and
communicating the modeled response to the design device.

11. The method of claim 8 , comprising indicating, using the design device, that the battery model, the control application program, or both are validated when a difference between the measured response to the calibration current pulse and the modeled response to the calibration current pulse is not greater than the difference threshold via an I/O device.

12. The method of claim 8 , wherein determining the calibration current pulse comprises:
identifying a driving profile of one or more current pulses expected to occur during operation of the battery pack;
determining characteristics of a current pulse from the one or more current pulses; and
determining, using the design device, the calibration current pulse from the characteristics of the current pulse.

13. The method of claim 8 , wherein adjusting the model parameters of the battery model, the control application program used to determine the modeled response, or both comprises:
determining a graphical representation of the difference between the measured response to the calibration current pulse and the modeled response to the calibration current pulse, wherein the graphical representation visualizes performance trade-offs that occur from a design change;
determining the design change based in part on the graphical representation of the calibration current pulse; and
adjusting the battery model, the control application program, or both, based in part on the design change.

14. The method of claim 13 , wherein determining the graphical representation of the difference between the measured response and the modeled response comprises a comparison between the difference between the modeled response and the measured response of the battery pack to the calibration current pulse.

15. A tangible, non-transitory, computer-readable medium storing instructions executable by one or more processors of a design device, wherein the instruction comprise instructions to:
determine, using the one or more processors, a calibration current pulse;
instruct, using the one or more processors, a battery system corresponding with a battery control system to supply the calibration current pulse to a battery pack;
determine, using the one or more processors, a measured response of the battery pack resulting from supply of the calibration current pulse based at least in part on sensor data received from one or more sensors;
supply, using the one or more processors, the calibration current pulse to a battery model corresponding with the battery pack;
determine, using the one or more processors,

Assignees

• Cps Tech Holdings Llc
• Cps Tech Services Llc

Inventors

• Rinaldo Steven G
• Jin Zhihong
• Wyatt Perry M

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• B60L3/12

  Recording operating variables {; Monitoring of operating variables} · CPC title

• B60L2240/547

  Voltage · CPC title

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/44

  Testing lamps · CPC title