Dynamic-Performance Measurements of Battery Cells for Electric Vehicle and Other Applications

Described is a method that has been used to (1) measure dynamic performance of research cells and (2) project performance (Wh/kg and W/kg) for full-size batteries of various designs when discharged in dynamic load profiles, such as the Simplified Federal Urban Driving Schedule (SFUDS). Discharged energy (mWh/cm²) and power (W/cm²) of research cells are measured under one-dimensional current distribution by powerdynamic or galvanodynamic discharge techniques. Static discharge and dynamic discharge produce significant differences in cell performance. Hence, the dynamic-performance measuring methods should be extremely useful, even at the early stage of battery R D, when systems intended for dynamic application are being evaluated.