Physics-Based CFD Simulation of Lithium-Ion Battery Under a Real Driving Cycle
The physics-based electrochemical model, Newman's Pseudo-2D (P2D) porous electrode model, has been widely accepted in the study of lithium-ion batteries. However, the model is built on the electrode scale. There are two challenges to apply such models in the electrochemical-thermal coupled battery simulation. The first one is how to use such electrode-scale models in the large scale simulation (battery dimension scale). The other one is how to make the physics-based model cost-efficient in a computational fluid dynamics (CFD) simulation. In this work, the multi-scale multi-dimensional approach (MSMD)  is used to address the first technical issue, and a linear approximation method for source terms  is used to address the second issue. As a result, Newman's P2D model can be used to simulate a lithium-ion battery's behavior under a real driving cycle in a three dimensional CFD simulation. In this work, a single battery cell under the FUDS driving cycle is simulated, and spatial distributions and time histories of many key variables related to the thermal and electrical behavior are presented.
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