An EREV (Extended-Range Electric Vehicle) is driven by electric motors while an onboard combustion-engine range extender can generate electricity to support the battery and extend driving range.
How an EREV works
An EREV combines an electric propulsion system, battery and range-extension system. Li Auto describes its EREV models as purely motor-driven, with energy supplied by both the battery and range extender. The vehicle can typically replenish energy by charging and by refueling.
EREV vs PHEV
The boundary can be confusing because both have a battery, charging port and combustion engine. The useful distinction is drivetrain role: in a classic range-extended architecture the electric motor is responsible for propulsion and the engine primarily generates electricity. Many PHEVs can mechanically drive the wheels through the engine as well.
Why EREVs are gaining attention
- Electric-motor driving feel for most propulsion.
- Long-distance energy replenishment using fuel where charging is limited.
- Larger usable electric range than many traditional plug-in hybrids.
- Potentially simpler engine operating strategy because the engine is not required to follow wheel speed directly.
What are the trade-offs?
An EREV still carries an engine, fuel system, exhaust system and battery, so it has more powertrain hardware than a BEV. Fuel use and emissions still occur when the range extender runs, and efficiency depends heavily on how the vehicle is charged and driven.
Related terms
Sources
- Li Auto — company profile and EREV strategy
- Li Auto — 2026 Form 20-F EREV powertrain description
- Magna — DHD REX range-extender system
Automotive terminology evolves quickly. We separate established standards from manufacturer-specific names and update pages as technologies move into production.