(Invited) Methods for the Parameterisation of Battery Thermal Models

Thermal properties are fundamental parameters in every battery cell model. They govern how heat moves through the cell or dissipates once it has been produced. Modelling the movement of heat in batteries is essential for safety and also for accurate predictions of temperature. Electrical/electrochemical models of the cell are highly sensitive to temperature making accurate thermal properties an essential requirement. However, measuring these properties is extremely difficult due to the complex structure inside a cell. Previous measurement methods suffered from fundamental flaws and often battery thermal models are either over simplified or overly complex. This presentation will present the challenges faced before novel methods are presented which address this. This includes a novel method developed for measuring thermal conductivity which uses state-of-the-art heat flux sensors to reduce errors from up to 50% down to 5.6%. These novel methods represent the future for thermal parameterisation of lithium-ion batteries which will lead to accurate electrical/electrochemical models and improved thermal safety.