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Modelling of a Lithium Ion Battery with Rebound Properties
walsh, robert
walsh, robert
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Thesis/Dissertation
Date
2021
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Mechanical Engineering
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http://dx.doi.org/10.34944/dspace/7173
Abstract
In recent years, the number of electric vehicles (EVs) on the road has increased drastically. In parallel to the increase of EVs, there is a proportionate increase in collisions involving them which poses a serious risk of Lithium-Ion Battery (LIB) damage. As these EVs and technology continue to increase in occurrence and complexity, there must be a similar jump in advanced testing and modelling to accurately predict and protect against major failure. FEM has emerged as the leading preventative measure for crash analysis but, due to the complexity of modern vehicles, these simulations require homogenization of models for simplicity and reduced calculation time. This requires experimental equipment to be developed to mechanically deform the LIBs in order to obtain load and displacement curves necessary for simulation. These simulations are then calibrated in order to represent the experiment that has been completed. Thus far researchers have focused on the compression properties but have not provided insight into the rebound response of the battery cells. This thesis project is threefold: to develop experimental equipment necessary to perform the required deformation testing, use said equipment to perform deformation experiments on a series of LIB, and to develop a set of models corresponding to the indentation experiments. The simulations from these models should accurately represent the compression and rebound portions of the resultant load-displacement curves. It was determined that adjustment of the final stage of the stress curve used in LS DYNA, dictated the response of the rebound curve following compression. The comparison of the simulation vs the experimental results of the indentation experiments show that depending on the type of loading, different representative material models could be used to simulate the cell behavior. Effects of punch head size, element size, as well as punch head geometry and material selection were studied in this research. The smaller the punch head the smaller the elements must be to capture the LIB response and similarly the more complex the punch geometry the smaller the elements must be. These findings, and the models developed will be used to further the research on LIB homogenization and fully modelling rebound curves moving forward.
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