  Battery thermal management system is an indispensable part of the electric
vehicles working with Lithium-ion batteries. Accordingly, lithium-ion batteries
modeling, battery heat generation, and thermal management are the main focus of
researchers and car manufacturers. To fulfill the need of manufacturers in the
design process, a faster model than time-consuming Computational Fluid Dynamics
models (CFD) is required. Reduced Order Models (ROM) address this requirement
to maintain the accuracy of CFD models while could be compiled faster. Linear
Time Invariant (LTI) reduced order model has been used in the literature;
however, due to the limitation of LTI system, considering the constant flow
rate for the cooling fluid, a Linear Parameter Varying system with three
scheduling parameters was developed in this study. It is shown that LPV system
results could fit accurately to CFD results in conditions that LTI system
cannot maintain accuracy. Moreover, it is shown that applying varying water
flow rates could result in a smoother temperature profile.
