The F3DM is a small four-door saloon equipped with an electric motor and a 1-litre petrol engine, both of which can drive the car.
With its batteries fully charged it can travel up to 60 miles on electricity alone. When the batteries become depleted the petrol engine takes over. And while the engine can charge the batteries, as in existing hybrids such as the Toyota Prius, the F3DM is intended to be recharged overnight by plugging into the domestic mains.
Initially, the F3DM will be sold in China's metropolitan areas starting in Shenzhen, the company’s home city. The price of 150,000 yuan (£14,400) is little more than half that of the Prius in the Chinese market. BYD expects to have several plug-in hybrid models on sale in Europe and America within three years.
The company says that the key to these products is its “iron battery”. This lithium iron-phosphate battery is related to the lithium-ion cells used in laptops and mobile phones (for which BYD is the world’s biggest supplier) but cheaper to produce, and smaller and lighter than those being adopted by other carmakers.
Toyota and Honda show their latest petrol-electric hybrids at the Detroit show this week but neither the new Prius (coming to the UK in the summer) nor the Honda Insight (on sale in March) are offered with the plug-in facility. The Japanese manufacturers remain uncertain about the safety and reliability of lithium batteries but Toyota expects to have a plug-in version of the Prius available next year.
Beleaguered General Motors will launch its plug-in electric car, the Chevrolet Volt, in 2010. Technically this is also a hybrid as it has a small auxiliary petrol engine, but that does not drive the car – it is there to charge the batteries to extend the car’s range.
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