The BMW i3 is primarily an electric vehicle EV designed to operate on electric power stored in its high-voltage lithium-ion battery pack. However, some versions of the BMW i3 are available with an optional range extender, often referred to as the REx model. The range extender is a small internal combustion engine that serves as a generator to produce electricity, providing additional range when the battery is depleted.

　　Heres how it works:

　　Electric-Only Operation: In its standard mode, the BMW i3 operates as a fully electric vehicle. It runs on electric power supplied by the battery and the electric motor, producing zero tailpipe emissions during operation. Optional Range Extender REx: Some versions of the BMW i3 come with an optional range extender, which includes a small gasoline engine. This engine does not drive the wheels directly instead, it acts as a generator to produce electricity when the batterys state of charge is low. Increased Range: The range extender provides additional electric range to the i3, allowing the driver to continue driving even after the battery is depleted. The gasoline engine generates electricity to power the electric motor and maintain the vehicles performance. Its important to note that even when equipped with the range extender, the BMW i3 is fundamentally an electric vehicle. The range extender is designed to offer increased flexibility for drivers who may need to travel beyond the electric range of the battery alone. The majority of the driving is done using electric power, and the gasoline engine is used as a backup for extended trips.

　　If you are considering a BMW i3 and are interested in the range extender option, its recommended to check the specific model year and trim level to whether the range extender is included. Additionally, newer BMW electric models may follow a different design philosophy, so its advisable to review the latest information from BMW for the most accurate details.

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