Experimental Performance Analysis of LG E-66 Cells from a Fast-Charging Porsche Taycan Battery Module

The Porsche Taycan, which is capable of up to 270 kW DC fast charging, can be charged from 5 to 80% state of charge (SOC) within 23 minutes. To better evaluate the battery storage system performance of the Taycan and explore ways to improve fast charging capability for electric vehicles (EVs), this work comprehensively tested a battery module as well as a battery cell taken from the Porsche Taycan EV. To monitor the thermal performance of the module during charging, three thermocouples are placed at the bottom of the module, and nine more on the cell surface within the actual module. Battery cell characterization tests were performed under -10, 0, 10, 25 and 40°C, and the module was evaluated based on the charging efficiency and the power loss at different charging rates. The results show that charging efficiency at 0.5C, 1C, and 1.5C is 97.9%, 97.1%, and 95.9%, respectively. Furthermore, a rescaled fast charge profile from the Porsche Taycan EV was applied to charge the module. The results show that, compared to a constant 1.5C charge, the fast-charge profile can charge the module to 80% SOC 1.4 times faster, with a cell surface temperature distribution of only ±1.9°C.