Cell Failure Evaluations under Environmental and Safety Tests of Multiple 18650 Li-Ion NCA and NMC Cells for Space Cell's Qualification Estabilishment

This research aims to evaluate Li-Ion cell failures under environmental (vibration and shock) and safety (over-discharge/-charge, and short) tests. For this objective, this research considered six Li-Ion different cells such as four NCA (Li[NiCoAl]O 2 ) cells for high-power and two NMC (Li[NiMnCo]O 2 ) cells for high-energy. After vibration and shock tests in X, Y, Z axis based on each procedure predetermined, discharge capacities and internal resistances are respectively compared before and after. It is also judged whether experimental NCA and NMC cells are suitable or not in space application under a predetermined condition of safety tests. Additional results of scanning electron microscope (SEM) and X-ray diffraction (XRD) are discussed.