The temperature conditions during operation are of great importance for safety, performance and lifetime of lithium-ion battery cells. Especially in automotive applications, the cooling conditions and the thermal cell behaviour of the entire battery pack are crucial. In the past several years, many studies focussed on modelling the thermal behaviour of lithium-ion cells in order to resolve the internal temperature distribution as a function of operational conditions . To ensure the model significance, simulation results are usually validated with experimental data. The current contribution emphasizes the importance of elaborate selection of the external ambient conditions of the experiments used for model validation. Moreover, the performed study shows, that not only the general ambient environment, but also additional effects, such as the battery tester wiring, have a strong impact on the measured cell temperature on various locations on the cell and need to be considered within the simulations. Furthermore, an experimental setup, with defined external boundary conditions, is demonstrated that reproduces the environment of a prismatic lithium-ion cell in a BEV application.
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