Battery cell imbalance detection system during battery discharging
AssigneeTesla, Inc.
InventorsMichael Kuss, Frederic Marangone, Orion Andrew King
Life of this patent
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Abstract
The present disclosure generally relates to systems and methods for monitoring battery cell imbalance during battery discharging. A battery can include a plurality of battery cells. During the battery discharging process, when the battery capacity reaches the criteria, a battery discharging device retrieves energy and/or voltages of the battery and determines the change of voltages corresponding to the change of the energy for the battery. The determined results can be compared to battery discharging reference data to determine battery cell imbalance. The battery discharging device may terminate the battery discharging process by detecting the battery cell imbalance.
Claims20
A system for managing battery discharging based on a battery cell imbalance, the system comprising:
- a battery including a plurality of battery cells;
- and
- a battery discharging device connected to the battery, wherein the battery discharging device is configured to:
- measure initial battery voltage and initial energy;
- initiate battery discharging;
- determine one or more criteria related to discharged energy of the battery;
- and
- in response to determining that the battery is discharged to the criteria:
- measure voltage and energy of the battery,
- determine, by accessing battery discharging reference data, a reference data that includes a reference metric of voltage change with respect to energy change between the initial energy and the measured energy, wherein the battery discharging reference data includes a plurality of reference voltages and a plurality of energy levels that each voltage corresponds to one or more of the energy levels,
- determine a metric of measured voltage change that indicates voltage changes between the measured voltage and the initial voltage with respect to the measured energy and the initial energy,
- compare the metric of the measured voltage change with the reference data, and
- manage the battery discharging based on a comparison result between the metric of the measured voltage change and the reference data.
A battery discharging device to discharge a battery including a plurality of battery cells, the battery discharging device is configured to:
- initiate discharging the battery;
- measure initial battery voltage and initial energy;
- determine one or more criteria related to discharged energy of the battery;
- in response to determining that the battery is discharged to the criteria, measure voltage and energy of the battery;
- determine, by accessing to a battery discharging reference data, a reference data that includes a reference metric of voltage change with respect to energy change between the initial energy and the measured energy, wherein the battery discharging reference data includes a plurality of reference voltages and a plurality of energy levels that each voltage corresponds to one or more of the energy levels;
- determine a metric of measured voltage change that indicates voltage changes between the measured voltage and initial voltage with respect to the measured energy and the initial energy;
- compare the metric of measured voltage change with the reference data;
- and
- in response to determining that the comparison result indicates that the metric of measured voltage change is same as the reference data, resume the battery discharging, or
- in response to determining that the comparison result indicates that the metric of measured voltage change is different from the reference data, terminate the battery discharging.
A method of managing a battery discharging, the method comprising:
- initiating discharge of the battery via a connection of the battery to a battery discharging device, wherein the battery includes a plurality of battery cells;
- measuring initial battery voltage and initial energy;
- determining one or more criteria related to discharged energy of the battery;
- in response to determining that the battery is discharged to the criteria, measuring voltage and energy of the battery;
- determining, by accessing to a battery discharging reference data, a reference data that includes a reference metric of voltage change with respect to energy change between the initial energy and the measured energy, wherein the battery discharging reference data includes a plurality of reference voltages and a plurality of energy levels that each voltage corresponds to one or more of the energy levels;
- determining a metric of measured voltage change that indicates voltage changes between the measured voltage and initial voltage with respect to the measured energy and the initial energy;
- comparing the metric of measured voltage change with the reference data;
- and
- managing the battery discharging based on a comparison result between the metric of measured voltage change and the reference data.
Dependencies are inferred from the claim text.