	US 12,259,436 B2
	Battery status monitoring and battery management of an information handling system
Jui Chin Fang, Taipei (TW); Chien-Hao Chiu, Taoyuan (TW); Wen-Yung Chang, Taoyuan (TW); and Pei-Ying Lin, New Taipei (TW)
Assigned to Dell Products L.P., Round Rock, TX (US)
Filed by Dell Products L.P., Round Rock, TX (US)
Filed on Mar. 29, 2023, as Appl. No. 18/192,342.
Prior Publication US 2024/0329139 A1, Oct. 3, 2024
Int. Cl. G01R 31/367 (2019.01); G01R 31/388 (2019.01); G01R 31/389 (2019.01); H02J 7/00 (2006.01)

CPC G01R 31/367 (2019.01) [G01R 31/388 (2019.01); G01R 31/389 (2019.01); H02J 7/00712 (2020.01)]

17 Claims

1. A method of managing a battery at an information handling system, the method comprising:

charging, over a first time period, the battery with a first charging current;

charging, over a second time period after the first time period, the battery with a second charging current less than the first charging current;

for each cell of the battery:

measuring, in response to the first charging current and over the first time period, a first amperage and a first voltage of the cell at predetermined intervals;

measuring, in response to the second charging current and over the second time period, a second amperage and a second voltage of the cell at the predetermined intervals;

storing, at a look-up table (LUT) at a storage device, data indicating the first and the second amperages and the first and the second voltages of the cell at each of the predetermined intervals;

determining, based on the stored data, that the first amperage of the cell was maintained greater than a first threshold amount of time within the first time period, and in response, qualifying the first amperage and the first voltage as stable for the first time period;

determining, based on the stored data, that the second amperage of the cell was maintained greater than a second threshold amount of time within the second time period, and in response, qualifying the second amperage and the second voltage as stable for the second time period;

in response to qualifying the first amperage and the first voltage for the first time period and qualifying the second amperage and the second voltage for the second time period, calculating a direct circuit internal resistance (DCIR) of the cell based on a ratio of i) a first difference between first voltage and the second voltage and ii) a second difference between the first amperage and the second amperage; and

determining, based on the stored data, that the first amperage of the cell was not maintained greater than the first threshold amount of time within the first time period, and in response, resetting the charging current of the battery to the first charging current and resetting the look-up table.