METHOD FOR DETERMINING A CAPACITY OF AN HV BATTERY

A method is provided for determining a capacity of a traction battery. The method includes initiating and/or waiting a predetermined time during which a battery current is below a threshold amount. The method proceeds by selecting an OCV characteristic curve from a group of such curves (--) based on at least two parameters (P, P, . . . Pn). At least one parameter (P) describes a cell characteristic of battery cells used in the traction battery, and at least a second parameter (P) describes an operating parameter of the traction battery prior to the predetermined time and/or during the predetermined time. The method continues by determining an open circuit voltage of the traction battery after the predetermined time has elapsed and determining the capacity of the battery based on the selected OCV characteristic curve.