Reduced central processing unit load and memory usage battery state of charge calculation

A method of controlling a vehicle comprising:

• identifying a plurality of subsets of cells forming a battery pack, wherein the cells of each of the subsets have a specified set of cell parameter values falling within a specified range of values and wherein the specified range of values for each of the subsets is different;
• calculating an electric charge accumulated or spent by less than all of the cells of each of the subsets based on cell state of charge data;
• calculating an average electric charge accumulated or spent by the battery pack based on the electric charge accumulated or spent by less than all of the cells for each of the subsets;
• calculating a cell state of charge for each of the cells based on the average electric charge accumulated or spent by the battery pack;
• calculating a battery pack state of charge based on the cell states of charge;
• and
• generating a control output for the vehicle based on the battery pack state of charge.

A method for estimating a battery pack state of charge comprising:

• grouping cells of the battery pack into a plurality of subsets;
• calculating a battery pack state of charge based on an initial state of charge of each of the cells at vehicle activation and an electric charge accumulated or spent by each of less than all of the cells of each of the subsets since vehicle activation;
• and
• outputting information based on the battery pack state of charge for vehicle control or display.