Battery model and control application calibration systems and methods

Patent metadata

Field	Value
Publication number	US-12057557-B2
Application number	US-202218079125-A
Country	US
Kind code	B2
Filing date	Dec 12, 2022
Priority date	Oct 12, 2016
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

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:
a battery system comprising a battery control system communicatively coupled to a sensor for sensing, the battery control system being configured to
determine a measured battery state by executing a control application based at least in part on a measured operational parameter; and

a design device communicatively coupled to the battery control system, the design device comprising a processor programmed to:
determine the measured operational parameter for the battery system, by an application of a first calibration stimulus with the first calibration stimulus having a physical stimulus, from a signal received from the sensor;
determine a modeled operational parameter by an application of a second calibration stimulus, with the second calibration stimulus having a modeled stimulus, to a battery model corresponding with the battery system, the first calibration stimulus corresponding to the second calibration stimulus;
determine a modeled battery state by executing a control application based at least in part on the modeled operational parameter; and
adjust model parameters of the battery model, the control application, or both based on a difference between the modeled operational parameter and the measured operational parameter, a difference between the modeled battery state and the measured battery state, or both.

2. The system of claim 1 , wherein the control application 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 a battery of the battery system.

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 battery system, stored energy in the battery system divided by a total energy storage capacity of the battery system, or a capability of the battery system to deliver the stored energy.

4. The system of claim 1 , wherein characteristics of at least one of the first calibration stimulus and the second calibration stimulus are derived from characterization data during sensing of dynamic power capability during both discharge and charge events.

5. The system of claim 1 , wherein the adjusting the model parameters of the battery model, the control application, or both comprises adjusting the model parameters based at least in part on a graphical representation of the first calibration stimulus and the second calibration stimulus, with the graphical representation based on a current value, an initial percent charged value, and an initial temperature value.

6. The system of claim 1 , wherein the signal is configured to sense a sensed parameter of a battery of the battery system, wherein the sensed parameter of the battery includes an electric parameter of a battery cell of the battery and the battery model corresponding to the battery includes a battery cell model corresponding to the battery cell.

7. A method for calibrating a battery control system, comprising:
determining, using a design device, a calibration stimulus, the calibration stimulus being a first calibration stimulus and a second calibration stimulus;
instructing, using the design device, a battery system corresponding with the battery control system to apply the first calibration stimulus to a battery pack to determine a measured operational parameter, with the first calibration stimulus having a physical stimulus;
applying, using the design device, the second calibration stimulus to a battery model corresponding with the battery pack to determine a modeled operational parameter, with the second calibration stimulus having a modeled stimulus, with the first calibration stimulus corresponding to the second calibration stimulus;
determining, using the design device, a modeled response resulting from supply of the second calibration stimulus to the battery model; and
adjusting, using the design device, model parameters of the battery model, a control application used to determine the modeled response, or both when a difference between a measured response and the modeled response of the battery pack to calibration stimulus is greater than a difference threshold.

8. The method of claim 7 , wherein determining the modeled response comprises:
determining a parameter resulting from supply of the calibration stimulus to the battery model;
determining the modeled response by executing the control application based at least in part on the parameter; and
communicating the modeled response to the design device.

9. The method of claim 7 , comprising indicating, using the design device, that the battery model, the control application, or both are validated when the difference between the measured response and the modeled response is not greater than the difference threshold via an I/O device.

10. The method of claim 7 , wherein determining the calibration stimulus comprises:
identifying a profile of one or more stimulus expected to occur during operation of the battery pack;
determining characteristics of a stimulus from the one or more stimulus; and
determining, using the design device, the calibration stimulus from the characteristics of the stimulus.

11. The method of claim 7 , wherein adjusting the model parameters of the battery model, the control application used to determine the modeled response, or both comprises:
comparing the difference between the measured response and the modeled response of the battery pack to the calibration stimulus;
determining a graphical representation of the comparison, 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 stimulus; and
adjusting the battery model, the control application, or both, based in part on the design change.

12. The method of claim 7 , wherein storing, using the design device, the battery model, the control application, or both in the battery control system to enable subsequent use during operation of the battery system when the difference between the measured response and the modeled response is not greater than the difference threshold.

13. A tangible, non-transitory, computer-readable medium storing instructions executable by one or more processors of a design device, wherein the instructions comprise directions to:
determine, using the one or more processors, a calibration stimulus, with the calibration stimulus including a first calibration stimulus and a second calibration stimulus;
instruct, using the one or more processors, a battery system corresponding with a battery control system to supply the first calibration stimulus to a battery pack to determine a measured operational parameter, with the first calibration stimulus including a physical stimulus;
supply, using the one or more processors, the second calibration stimulus to a battery model corresponding with the battery pack to determine a modeled operational parameter, with the second calibration stimulus including a modeled stimulus, and the first calibration stimulus corresponding to the second calibration stimulus;
determine, using the one or more processors, a modeled response resulting from supply of the calibration stimulus to the battery model; and
adjust, using the one or more processors, model parameters of the battery model, a control application used to determine the modeled response, or both when a difference between a measured response of the battery pack to calibration stimulus and the modeled response is greater than a difference threshold.

Assignees

• Cps Tech Holdings Llc

Inventors

• Rinaldo Steven G
• Jin Zhihong
• Wyatt Perry M

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• B60L2240/549

  Current · CPC title

• B60L2240/545

  Temperature · CPC title