Batteries are made of diverse materials. Non-uniformity, impurities, and defects within the battery structure negatively affect the performance, stability, and durability of the product. As batteries are repeatedly charged and discharged, their quality degrades due to changes in the internal structure. Therefore, to evaluate a battery’s internal structure, a non-destructive observation technique is needed. By using an X-ray microscope, which can observe transparently the internal area of a sample, the micron structure within a laminated battery cell can be observed in a non-destructive manner. The structure can be visualized in 3D as well by using the CT (Computed Tomography) technique.