Blog written by Ahmed Uddin, Systems Modeling & Simulation Team Leader for the Wayne State University EcoCAR 3 Team
The Wayne State University (WSU) systems modeling and simulation (SMS) team spent the winter break developing an in-house battery model utilizing a non-equivalent-circuit approach that is known for higher reliability in calculating internal heat generation and temperature rise of the battery cell.
The SMS team knew that simulating a system with high fidelity is very crucial in predicting a system’s behavior. These simulations will help the team to better validate the sub-models before integrating the system into the vehicle.
The Battery Design Studio (BDS) of CD-adapco was used which includes the “Newman Tiedemann Gu” (NTG) modeling approach that has template-like tools to fit either the Hybrid Pulse Power Characterization (HPPC) or constant-current charge/discharge test results to polynomials, from which the heat generation is calculated from various coefficients of the fitted polynomials. Then, a MathWorks Simulink model was created by the SMS team to predict a lumped-mass equivalent temperature rise for various test drive cycles and operation conditions of a Battery Electric Vehicle model.
While much of this work was done in preparation for the Winter Workshop SMS presentation, the WSU team members gained valuable experience with Simulink as well as advanced software like BDS. The team will use these skills in the future to develop Simulink models for the team’s selected vehicle architecture at the end of Year One.
Categories: Under the Hood