US 12,451,531 B2
Method for determining a state of a cell of a battery
André Seidel, Gifhorn (DE); Jan-Michael Köhler, Braunschweig (DE); Stephan Rudolph, Bahrdorf (DE); and Ilmir Baianov, Schöppenstedt (DE)
Assigned to VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg (DE); and STODIA GMBH, Gifhorn (DE)
Appl. No. 18/010,659
Filed by VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg (DE); and STODIA GMBH, Gifhorn (DE)
PCT Filed Jun. 15, 2021, PCT No. PCT/EP2021/066043
§ 371(c)(1), (2) Date Jan. 31, 2023,
PCT Pub. No. WO2021/254995, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 10 2020 115 887.4 (DE), filed on Jun. 16, 2020.
Prior Publication US 2023/0163375 A1, May 25, 2023
Int. Cl. H01M 10/48 (2006.01)
CPC H01M 10/482 (2013.01) [H01M 2220/20 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for determining a respective state of each of a plurality of cells of a battery, comprising at least the following steps:
a) carrying out a charging operation or a discharging operation on the plurality of cells;
b) determining a discharge voltage of each of the plurality of cells and a charge voltage of each of the plurality of cells;
c) determining at least one state parameter for each of the plurality of cells,
wherein the state parameter is derived from the discharge voltage and the charge voltage,
wherein a discharge and a charge voltage of at least one other cell is taken into account for the state parameter,
wherein one state parameter is at least one capacity parameter or equilibrium parameter,
wherein the capacity parameter describes a ratio of the discharge voltage and the charge voltage of a cell taking ratios of other cells into account, and
wherein the equilibrium parameter describes a discharge voltage level and a charge voltage level of a cell compared to respective voltage levels of other cells.