Patent ID: 10267863

Abstract:
Automatically determining state-of-charge of a battery with cells includes, for each cell, scheduling refreshment times for the cell as a function of the cell's priority level, at times that correspond to refreshment times for the first cell, fully executing an estimation algorithm for the first cell, for at least a second cell of the set of cells, and at times other than those that correspond to refreshment times for the second cell, partially executing the estimation algorithm for the cell thereby obtaining an estimate of the second cell's state-of-charge, and determining a state-of-charge of the battery from states-of-charge estimated for each of the cells of the battery. The estimation algorithm estimates a cell's state-of-charge at a particular time as a function of a measured voltage and a measured current, both of which are obtained at the particular time. As a result of having scheduled refreshment times for each cell based on priority levels for the cell, a first cell from the plurality of cells has its state-of-charge estimate refreshed more frequently than a second cell from the plurality of cells when the first cell has a higher priority than the second cell.