Modelling of 3D Temperature Behavior of Prismatic Lithium-Ion Cell with Focus on Experimental Validation Under Battery Electric Vehicle Conditions

The electrification of vehicles focuses on battery electric vehicle (BEV) concepts with lithium-ion battery systems where temperature has a great impact on performance, safety and lifetime. Modelling the thermal behavior of lithium-ion batteries enables researchers to investigate the temperature distribution under different cooling conditions in detail. Model validation with experimental tests is necessary to ensure meaningful simulation models. Therefore, experiments have to be performed under defined conditions with a distinct understanding of influences, so that they can be used for validation. In this paper, a 3D electro-thermal battery model is developed and parametrized. An experimental setup with defined external influences is designed which takes the conditions of a lithium-ion cell in a BEV use case into account. Experimental tests with prismatic cells are performed for different charging profiles and finally, the thermal behavior of the model is validated under experimental conditions of BEV scenario with a spatial resolution of temperature.