This study introduces the use of industrial computed tomography as a complementary method to traditional capacity and internal resistance measurements for assessing the state of health (SOH) of electric vehicle lithium batteries. While traditional methods focus primarily on electrical characteristics, the application of industrial CT enables non-destructive, three-dimensional visualization and analysis of internal structural changes within individual battery cells. This study specifically investigates the effects of different discharge rates (1C, 2C, and 3C) and cycle counts on battery degradation by comparing CT scan data before and after the aging. The findings offer enhanced insight into the physical mechanisms of battery aging related to varying discharge rates, providing a more comprehensive assessment of battery health. The discharge C-rate indicates how quickly a battery is discharged relative to its capacity. A 1C rate corresponds to full discharge in one hour, while 2C and 3C represent discharge in 30 and 20 min, respectively.