With the advent of the new energy vehicle era, electric oil pumps have gradually replaced mechanical pumps in electric and hybrid vehicles to meet high power density, miniaturization requirements, and enable precise lubrication oil pressure control, becoming a standard market configuration. Nearly all pure electric and hybrid vehicles now adopt electric oil pumps over traditional mechanical ones‌.

The oil pump delivers oil to engine friction points, ensuring circulation in the lubrication system. Most oil pumps are gear pumps comprising gears and a pump body. When the engine operates, the camshaft drives the active gear, rotating and moving oil from the inlet to the outlet via pump walls. This creates a low-pressure area to draw oil from the tank. Accumulated oil at the outlet increases pressure, forcing lubrication to friction points‌.