Frequency-Variable Resonant Self-Heating Technique for Lithium-Ion Batteries at Low Temperature. - Sang-Hyeon Ha; Jae-In Lee; Hyunki Yoon; Tae-Ryong Park; Jaeil Baek; Jae-Sang Kim; Gun-Woo Moon (IEEE Trans. Aerosp. Electron. Syst., 2022)