In recent years, studies have been conducted to confirm the battery charge/discharge state using a magnetic
resonance (MR) system. However, due to the structural characteristics of the battery, some difficulties exist in
acquiring the signal. For example, because a loop coil does not coincide with the battery cell structure, non-uniform
areas exist inside the cell samples, and it works as a limit to acquiring a quantitative MR signal measuring
from the pack of lithium-ion batteries (LIB). In addition, the radio-frequency (RF) signals are weakened by
the aluminum layer of the cell package. In this paper, we proposed a planar RF coil to obtain uniform ¹H and
⁷Li signals from this shielding-packaged battery cell in 7 Tesla (T) magnetic resonance image (MRI). To demonstrate
the usefulness of the proposed planar RF coil, we designed a loop coil for ¹H and ⁷Li, a planar coil for 1H,
and a cut coil for ¹H and ⁷Li. Then the performance of each coil was compared through a bench test. The water
phantom image was acquired with each coil, and the signal intensity profile and signal-to-noise ratio (SNR)
were calculated and compared. The ¹H/⁷Li images and spectra of the electrolyte phantom were obtained using
the cut coils, and the results were compared with the phantom.