Thermal runaway prognosis by detecting abnormal cell voltage and SOC degeneration
AssigneeGM Global Technology Operations LLC
InventorsYue-Yun Wang, Andrew C. Baughman
Life of this patent
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Abstract
A vehicle, system and method for monitoring an occurrence of thermal runaway in a battery pack of the vehicle. The system includes a plurality of voltage sensors and a processor. The plurality of voltage sensors obtains a plurality of voltage measurements at each of a plurality of battery cells of the battery pack. The processor is configured to determine a mean value based on the plurality of voltage measurements, compare a voltage measurement obtained from a selected battery cell to the mean value, and generate a notification signal when a difference between the voltage measurement from the selected battery cell and the mean value is greater than or equal to a prognostic threshold.
Claims20
A method of monitoring an occurrence of thermal runaway in a battery pack, comprising:
- obtaining a plurality of voltage measurements at each of a plurality of battery cells of the battery pack between a trailing time edge of a moving time window and a current time edge of the moving time window;
- determining a mean voltage based on the plurality of voltage measurements obtained between the trailing time edge and the current time edge;
- determining a residual for a selected battery cell, wherein the residual is a difference between a voltage obtained after the moving time window for the selected battery cell and the mean voltage;
- comparing the residual for the selected battery cell to a prognostic threshold, wherein the prognostic threshold is an integer multiple of a standard deviation of the plurality of voltage measurements obtained between the trailing time edge and the current time edge about the mean voltage;
- and
- generating a notification signal when the residual for the selected battery cell is greater than or equal to the prognostic threshold.
A system for monitoring an occurrence of thermal runaway in a battery pack of a vehicle, comprising:
- a plurality of voltage sensors for obtaining a plurality of voltage measurements at each of a plurality of battery cells of the battery pack between a trailing time edge of a moving time window and a current time edge of the moving time window;
- and
- a processor configured to:
- determine a mean voltage based on the plurality of voltage measurements obtained between the trailing time edge and the current time edge;
- determine a residual for a selected battery cell, wherein the residual is a difference between a voltage obtained after the moving time window for the selected battery cell and the mean voltage;
- compare the residual for the selected battery cell to a prognostic threshold, wherein the prognostic threshold is an integer multiple of a standard deviation of the plurality of voltage measurements obtained between the trailing time edge and the current time edge about the mean voltage;
- and
- generate a notification signal when the residual is greater than or equal to the prognostic threshold.
A vehicle, comprising:
- a battery pack having a plurality of battery cells;
- a plurality of voltage sensors for obtaining a plurality of voltage measurements at each of the plurality of battery cells between a trailing time edge of a moving time window and a current time edge of the moving time window;
- and
- a processor configured to:
- determine a mean voltage based on the plurality of voltage measurements obtained between the trailing time edge and the current time edge;
- determine a residual for a selected battery cell, wherein the residual is a difference between a voltage obtained after the moving time window for the selected battery cell and the mean voltage;
- compare the residual for the selected battery cell to a prognostic threshold, wherein the prognostic threshold is an integer multiple of a standard deviation of the plurality of voltage measurements obtained between the trailing time edge and the current time edge about the mean voltage;
- and
- generate a notification signal when the residual is greater than or equal to the prognostic threshold.
Dependencies are inferred from the claim text.