The application of the lithium ion technology is one of the most promising candidates to enforce the development electromobility. At the moment the achievable driving range is still below conventional passenger vehicles. The reduction of weight and the related optimization of the battery system regarding in use materials and components is the aim of present studies of vehicle manufacturers. The investigation of deformation effects occurring under mechanical loads is of major interest. This study is concerned with the mechanical description of the cylindrical metal can battery cell in format 26650, a cell type used in the automobile industry. Therefore necessary information of the topic hybrid and electric vehicle were summarized within this master thesis and present approaches in literature concerning the mechanical deformation behaviour of cylindrical metal can cells were investigated. In the following, load tests and occurring effects during deformation of the battery cell were demonstrated and interpreted. The achieved force / displacement - characteristics provided the basis for the development of a finite-element-model (FEM) simulation of the battery cell. The approach of utilizing a honeycomb material model for characterizing the active cell material has shown to be capable to simulate the anisotropic deformation behaviour of a cylindrical battery cell. The simulation results were evaluated and validated with the help of a three-point bending test. In addition a full vehicle simulation model verified the calculation ability of the battery model. Finally the results were summarized and steps for a further development of the simulation model of the battery cell were demonstrated.
|Qualification||Master of Science|
|Award date||20 Jul 2015|
|Publication status||Published - 29 May 2015|