Technical Papers and Presentations

The characterization of Li-ion batteries is a relevant topic due to the recent developments in Electric Vehicles (EV’s) and Hybrid Electric Vehicles (HEV’s) applications. In order to manage these devices, accurate models are required.

At NEXT ENERGY a two dimensional cell-level thermal model was created based on the discharge characteristics of a cylindrical 18650 secondary Li-ion battery cell. With focus on the spiral geometry the heat transfer in solids interface of COMSOL Multiphysics® was used to describe the temperature gradient in radial direction during discharge at 1C. Experimental input parameters such as heat capacity and thermal diffusivity were defined using Differential Scanning Calorimetry (DSC) and Laser Flash Analysis (LFA).