A Thermal Electric Two-Way Coupled Battery Pack Model for an All Electric VW Motorsport Racer 2019-01-0593
This paper presents a thermal electric two-way coupled li-ion battery pack model for an all electric VW motorsport racer. It starts from the Hybrid Pulse Power Characterization (HPPC) test data at different State of Charge (SOC) and temperature levels. Such information is used for cell level battery Equivalent Circuit Model (ECM) parameter identification. 56 cell ECMs are connected in series to create the module ECM. Eight module ECMs are connected using 2P4S configuration to create the pack ECM. Battery thermal performance is simulated first by computational fluid dynamics (CFD) for the module. Then, a thermal Reduced Order Model (ROM) is created out of CFD solution. The thermal ROM is then two-way coupled with the battery pack ECM to form a complete battery pack model. The complete model is then exported into Simulink for validation and simulation. Thanks to the ROM technology, such a battery pack model can finish a complete charge or discharge cycle within a few minutes of simulation time.