Dynamic compression and impact analyses of the lattice structures for battery safety

Abstract

In this study, a battery pack consisting of 18650-lithium-ion cells and battery housing was designed considering lattice structures instead of the plain sheet to improve crashworthiness. The behavior of lattice structures, including a novel design, cross semicircle, semicircle lattices, and topology-optimized model, in total seven different lattice models in dynamic compression and impact loading were examined. Displacement, energy absorption, and specific energy absorption values were compared with the 1.5 mm thick plain sheet model, which is common in the market. In the dynamic compression loading, honeycomb, and plain sheet models absorb more energy with the value of 97.34, and 88.67 J, respectively. Specific energy absorption is best for the plain sheet with the value of 3122.05 J/g, but honeycomb and cross semicircle lattices still have an impressive result of 2923.04, and 2158.30 J/g respectively. On the other hand, in the impact loading, the plain sheet is causing the jellyroll deformation with the highest value of 141.65 MPa, while the best protective structure is 3D kagome with a value of 4.85 MPa. However, the cross-semicircle keeps an average safety performance for both loading conditions.