What is the difference between plug-in hybrid and mild hybrid?
2 Answers
Light hybrid and plug-in hybrid differ mainly in the role of the electric power system's power output. The following is a comparison between the two: Battery: The mild hybrid has a smaller battery, and the electric power can only play an auxiliary role. Plug-in hybrid vehicles have a larger power battery, allowing the vehicle to drive purely on electricity like an electric car. In other aspects of the vehicle, there is not much difference. Mild Hybrid: Mild hybrid, also known as MHEV, most commonly features a 48V mild hybrid system, which quadruples the voltage compared to the 12V voltage of conventional fuel vehicles, enabling it to power more electrical devices. The electric system of this type of vehicle cannot support pure electric driving. Its motor only intervenes when the vehicle is at low speeds, effectively reducing the engine's fuel consumption. The battery is recharged by the generator during vehicle operation. Plug-in Hybrid: Plug-in hybrid vehicles are equipped with both electric and fuel power systems, featuring a larger power battery. They can drive purely on electricity for 50 to 110 kilometers, and when the battery is depleted, the engine takes over to drive the vehicle. Plug-in hybrid vehicles can be recharged using an external power source, achieving the environmental and energy efficiency levels of electric vehicles when driving purely on electricity. Plug-in hybrid models are classified as new energy vehicles and can be registered with new energy license plates.
When I was buying a car, I struggled with the difference between plug-in hybrids and mild hybrids because I commute a lot. A plug-in hybrid is like a semi-electric vehicle with a large battery that can be charged, capable of running 40-50 kilometers on pure electric power. If you have a home charging station, you hardly need to refuel—it's both eco-friendly and cost-effective. However, without charging stations, you’ll rely on gasoline. On the other hand, a mild hybrid is a light hybrid with a small motor that only assists the engine, such as during startup or braking energy recovery. It drives like an upgraded gasoline car, saving some fuel but not much, and lacks charging capability or a pure electric mode. Maintenance is simpler. My friend uses a mild hybrid for commuting and saves about 10% on fuel costs, while I use a plug-in hybrid, where electricity costs half as much. The difference lies in plug-in hybrids being greener, while mild hybrids are more hassle-free. It depends on personal habits—both are great for city traffic, but if charging is convenient, go for a plug-in hybrid.
