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Thermal Diffusivity Test Bench for Li Ion Cells Using LiveLink™ for MATLAB®

A. Arzberger[1]
[1]RWTH Aachen University -ISEA-, Aachen, NRW, Germany

LiveLink™ for MATLAB® is used to fit the surface temperature of a battery cell within a COMSOL Multiphysics® model to the temperature measured by a thermal imaging camera. The test bench was designed and built up of ourselves to allow nondestructive thermal diffusivity measurement of Li Ion cells as a function of temperature, state of charge (SOC), state of health (SOH) and others. In that way we determined the through-plane thermal diffusivity of Pouch cells in transmittance setup and the radial component of Cylindrical cells in reflective setup. Although the cell housing is ignored, the measurement can be fitted rather accurate by the models. With a corresponding COMSOL Multiphysics® model, even the in-plane values of Pouch cells, respectively axial parameters of Cylindrical cells, can be determined using this approach.