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Smart electric drive

Motor vehicle

  • 13 min read
  • 5 chapters

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Through Kilowatt-hour, Germany and Joint venture

The Smart EQ Forfour was an electric variant of the long wheelbase four-door second generation Smart Forfour city car Type 453 which shared approximately 70% of its parts with the third-generation Renault Twingo, both built by Renault in Slovenia.

Field testing of the electric Smart Fortwo 450 began in London with 100 units in 2007, leasing only due to the early molten salt ZEBRA battery. With a lithium-ion battery provided by a California startup named Tesla, the second-generation ED with the second-generation 451 chassis was introduced in 2009 and made available in 18 markets around the world for leasing, or through the Car2Go carsharing service in selected cities, with over 2,300 units delivered.

A near production version of the third-generation Smart ED, using the face lift 451 body and drive train plus complete Li-Ion battery built by Daimler joint ventures, was unveiled at the September 2011 Frankfurt Motor Show. Smart started in 2012 to mass-produce the electric car for regular availability in up to 30 markets worldwide. Deliveries of the third-generation Smart ED began in the U.S. and Europe in May 2013. More than 8,800 units of the second and third generation Smart ED were sold in North America and Europe between 2009 and June 2014, of which, over 6,500 units are third generation variants.

Since 2017, the fourth-generation Smart Electric Drive is being sold. As Daimler discontinued the electric joint ventures, it uses a Renault drive train, the fourth variant in as many electric generations. The body corresponds to the third-generation ICE-powered Smart 453; this mismatch in the numbering of generations arose because the Smart ED2 and the Smart ED3 were both based on the second-generation ICE-powered Smart 451.

First generation

The first Smart electric drive vehicles, still using the first generation type 450 body style, were modified by Zytek Electric Vehicles. They were powered by a rear-mounted 55kW brushless DC motor that sat where the gas engine would otherwise be mounted and drove the rear wheels. The motor was tuned to 30kW for smooth power delivery and was connected to a modified transmission, locked in 2nd gear. It ran on 13.2 kilowatt hours of sodium-nickel chloride Zebra batteries manufactured by MES-DEA of Switzerland. These types of molten salt batteries operate at 245 °C (473 °F). It is typically kept molten and ready for use because if allowed to "freeze" it takes twelve hours to reheat and charge. Thus it is not very useful for private owners, but rather in fleets of taxis, police cars and other vehicles that are operated by multiple users.

Field testing began in London with 100 vehicles in 2007 and was available only for lease to corporate clients for £375 per month.

Specifications

  • Power: 30 kW (40 hp)
  • Torque: 120 newton-metres (89 lbf⋅ft)
  • Battery capacity: 13.2 kWh sodium-nickel chloride Zebra batteries
  • Economy: 12 kilowatt-hours per 100 kilometres (430 kJ/km or 190 W·h/mi)
  • Range: 110 kilometres (68 mi)
  • Recharge time (80%): four hours
  • Recharge time (100%): eight hours
  • Top speed:120 kilometres per hour (75 miles per hour)

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