The compressive behavior of lithium-iron phosphate battery cells is investigated by conducting in-plane constrained compression tests and out-of-plane compression tests of representative volume element (RVE) specimens. The results for cell RVE specimens under in-plane constrained compression tests without pre-strains and with pre-strains in the out-of-plane direction indicate that the load carrying capacity is characterized by the buckling of cell specimens. As the pre-strain increases, the nominal compressive stress-strain curve becomes higher. The nominal stress-strain curves in the out-of-plane direction were also obtained and used to determine the elastic moduli for the elastic buckling analyses of the cell components in the cell RVE specimens with different pre-strains. Based on the elastic buckling analyses for a beam with different lateral constraints due to different pre-strains in the out-of-plane direction, the number of half waves and the buckling stresses were obtained. The results indicate that the number of half waves and the buckling stress increase as the pre-strain increases. The general trends of the numbers of half waves and the buckling stresses are in agreement with those obtained from experiments.
Compressive Behavior of Representative Volume Element Specimens of Lithium-Ion Battery Cells under Different Constrained Conditions
Sae Int. J. Mater. Manf
Sae International Journal of Materials and Manufacturing
SAE 2014 World Congress & Exhibition ; 2014
Sae International Journal of Materials and Manufacturing ; 7 , 2 ; 480-487
2014-04-01
8 pages
Conference paper
English
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