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2017
Conference Paper
Titel
Numerical investigation of phase change material utilization options for the thermal management of cylindrical Li-Ion-batteries
Abstract
The long term stability of a Li-ion-battery suffers from excess temperature as well as from an inhomogeneous temperature distribution within a battery pack. A possibility to overcome these challenges is the utilization of phase change material (PCM) as thermal buffer. Due to the latent heat storage PCM offer the potential to keep cells within a narrow temperature range. In the present study three PCM integration options for the thermal management of battery modules containing 18650-type cylindrical Li-ion cell are compared. The PCM is either coupled to the terminals, the shell or to both. A parametric study is carried out to investigate the effect of the anisotropic thermal conductivity within the cell. Further the dissipated heat rate is varied. Independent of the anisotropic thermal conductivity of the cell mounting the PCM at the shell and terminals is the most beneficial for compensating the dissipated heat, especially for high load periods. Beyond the phase transition the PCM acts as insulator. Therefore regeneration periods are necessary.