Simplified modeling of the thermodynamics of batteries for controllers

摘要

A vehicle has a traction battery consisting of a number of cells. A controller operates the traction battery according to a temperature for each of the cells. The temperature is based on a plurality of coefficients representing a contribution of at least one thermal cell boundary condition and heat generated in the cell to a steady state temperature at a predetermined position in the cell. The contributions can be filtered to predict a dynamic response of the temperature to changes in the thermal boundary conditions and the heat generated in the cell. The coefficients can be derived from a complete (full-order) model. The resulting reduced-order model requires less execution time and at the same time achieves similar accuracy to the full-order model. In addition, a range of characteristic temperatures can be obtained for each cell.