Technical Paper
Measured thermal performances at brick and module levels in a battery pack of a mid-size electric vehicle under WLTC and FTP driving cycles
2024-04-09
2024-01-2673
Battery electric vehicles (BEVs) are a solution to achieving sustainability and carbon neutrality. However, BEV performances are affected by the thermal performance imbalance in the battery packs under driving cycles. Temperature changes in the module, brick, and pack under the transient cycles must be understood for model-based development. The authors conducted chassis dynamometer experiments on a fully electric small crossover sports utility vehicle (SUV) to address this challenge, examining various conditions. The testbed employed a hub-type chassis dynamometer equipped with four dynamometers, a wind blower replicating actual ambient air, and a driving aid to assist the driver according to the Worldwide Harmonized Light Vehicles Test Cycle (WLTC) and Federal Test Procedures (FTP) under various ambient temperatures. The mid-size BEV with dual-motor featured 80 thermocouples mounted on the 74-kWh battery pack, including the cells, upper tray, side cover, and pack cover.