Nowadays, the electric vehicle market has entered a period of rapid development, promoting the manufacturers' demand for magnetic components.  Due to the special requirements of automobile operation environment, which usually involves high vibration and high temperature condition, the quality requirements of magnetic components are particularly strict. Inductance is a electronic component that can store electric energy in the form of magnetic flux.  Its position in electric vehicles cannot be ignored.  Molding chokes are widely used in today's automotive industry because of its characteristics of high magnetic saturation, low profile, noise suppression, good EMC performance, low magnetic leakage, impact resistance.