US 2022/0187383 A1Published application

Assessment of cell group health in a battery pack

AssigneeGM Global Technology Operations LLC

InventorsJames D. Hendrickson, Jeffrey A. Tymitz

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Abstract

A system for assessing health of a cell group within a module of a battery pack includes a controller having a processor and tangible, non-transitory memory on which instructions are recorded. One or more sensors are configured to obtain a series of respective average cell group voltages at different stages. The controller is adapted to obtain a measured voltage (VM) of the cell group at a calibration event occurring after the third stage. The controller is adapted to calculate a predicted voltage (VP) of the cell group based in part on a sum of a disparity factor (ΔV) and a third stage cell group voltage (V3). The cell group is controlled based at least partially on a difference between the measured voltage (VM) and the predicted voltage (VP).

Claims19

Dependent claims

A system for assessing health of a cell group within a module of a battery pack, the system comprising:

one or more sensors configured to obtain a data series of respective average cell group voltages, including a first stage cell group voltage (V1) at a first stage, a second stage cell group voltage (V2) at a second stage and a third stage cell group voltage (V3) at a third stage, the first stage occurring prior to the second stage and the second stage occurring prior to the third stage;
a controller having a processor and tangible, non-transitory memory on which instructions are recorded, execution of the instructions by the processor causing the controller to:
obtain the data series and calculate a predicted voltage (VP) of the cell group based on the data series, the predicted voltage (VP) being a summation of at least a disparity factor (ΔV) and the third stage cell group voltage (V3);
obtain a measured voltage (VM) of the cell group at a calibration event occurring after the third stage;
and
control the cell group based at least partially on a difference between the measured voltage (VM) and the predicted voltage (VP).

3 more elements

A method for assessing health of a cell group within a module of a battery pack in a system having a controller with a processor and tangible, non-transitory memory, the method comprising:

obtaining a data series of respective average cell group voltages, including a first stage cell group voltage (V1) at a first stage, a second stage cell group voltage (V2) at a second stage and a third stage cell group voltage (V3) at a third stage, via one or more sensors, the first stage occurring prior to the second stage and the second stage occurring prior to the third stage;
calculating a predicted voltage (VP) of the cell group based on the data series, the predicted voltage (VP) being a summation of at least a disparity factor (ΔV) and the third stage cell group voltage (V3);
obtaining a measured voltage (VM) of the cell group at a calibration event occurring after the third stage;
and
controlling the cell group based at least partially on a difference between the measured voltage (VM) and the predicted voltage (VP).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/121,814Filed 15 Dec 2020
Published: 16 Jun 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

G01R 31/392
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
B60L 53/62
Monitoring or controlling charging stations: in response to charging parameters, e.g. current, voltage or electrical charge
B60L 58/16
For monitoring or controlling batteries: responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
G01R 31/3835
Arrangements for monitoring battery or accumulator variables, e.g. SoC: involving only voltage measurements