Voltage control strategy for batteries including lithium- and manganese-rich (LMR) cathodes
AssigneeGM Global Technology Operations LLC
InventorsLei Wang, Jiazhi Hu, Meng Jiang, Gongshin Qi, Wei Li
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Abstract
A method for controlling a battery includes operating a lithium- and manganese-rich (LMR) battery within a first voltage window defined by an upper cutoff voltage threshold and a lower cutoff voltage threshold; monitoring a battery capacity of the LMR battery; and in response to the battery capacity of the LMR battery falling below a predetermined battery capacity, changing the first voltage window to a second voltage window by reducing the lower cutoff voltage threshold by a predetermined voltage value.
Claims19
A method for controlling a battery, comprising:
- operating a lithium- and manganese-rich (LMR) battery within a first voltage window for a predetermined quantity of battery cycles, wherein the first voltage window is defined by an upper cutoff voltage threshold and a first lower cutoff voltage threshold;
- monitoring a battery capacity of the LMR battery;
- and
- in response to the battery capacity of the LMR battery falling below a predetermined battery capacity after the predetermined quantity of battery cycles, changing the first voltage window to a second voltage window by reducing the first lower cutoff voltage threshold by a predetermined voltage value to a second lower cutoff voltage threshold.
A method for controlling a battery, comprising:
- operating a lithium- and manganese-rich (LMR) battery within a first voltage window defined by an upper cutoff voltage threshold and a lower cutoff voltage threshold;
- monitoring a battery capacity of the LMR battery;
- in response to the battery capacity of the LMR battery falling below a predetermined battery capacity, changing the first voltage window to a second voltage window by reducing the lower cutoff voltage threshold by a predetermined voltage value;
- lowering the lower cutoff voltage threshold by the predetermined voltage value in response to the battery capacity falling below the predetermined battery capacity until the lower cutoff voltage threshold is equal to a minimum lower cutoff voltage threshold;
- and
- reconfiguring connections between a plurality of LMR battery cells of the LMR battery to increase output voltage of the LMR battery in response to the battery capacity falling below the predetermined battery capacity while using a voltage window defined by the upper cutoff voltage threshold and the minimum lower cutoff voltage threshold,
- wherein the predetermined voltage value is in a range from 0.05V and 0.5V.
A battery system, comprising:
- a lithium- and manganese-rich (LMR) battery;
- a battery control module configured to:
- operate the LMR battery within a first voltage window for at least 100 battery cycles, wherein the first voltage window is defined by an upper cutoff voltage threshold and a lower cutoff voltage threshold;
- monitor a battery capacity of the LMR battery;
- and
- in response to the battery capacity of the LMR battery falling below a predetermined battery capacity after the at least 100 battery cycles, changing the first voltage window to a second voltage window by reducing the lower cutoff voltage threshold by a predetermined voltage value.
Dependencies are inferred from the claim text.