This article represents modeling steps for Lithiumion cells to achieve accurate temperature distribution pattern, while maintaining lowest computational burden. A 1D electrothermal model based on equivalent circuit approach is implemented to output the electrical characteristics as a function of temperature, current, and SoC. Temperature calculation tasks are done through 3D thermal model using volumetric heat input. A model order reduction approach is applied to the 3D model for coupling compatibility and preparing the models for integration into vehicles' powertrain. Results in commercial automotive industry simulation platforms, and validation tests demonstrate model precision and the feasibility of the presented approach.