Cadillac is working on a series version of the Converj concept, introduced at the North American International Auto Show in 2009. The production model will be an electric coupe, already called ELR. The car was confirmed and it’s testing the new electric drivetrain on north-american highways.
 
According to GM North America President Mark Reuss, "The ELR will be in a class by itself, further proof of our commitment to electric vehicles and advanced technology. People will instantly recognize it as a Cadillac by its distinctive, signature look and true-to-concept exterior design."
 
The ELR will advance the design theme of the Converj while featuring an electric propulsion system made up of a T-shaped lithium-ion battery, an electric drive unit, and a four-cylinder engine-generator. It will use electricity as its primary power source to drive the car without using gasoline or producing CO2 emissions.
 
When the battery’s energy is low, the ELR switches to a gasoline-powered electric generator to allow hundreds of additional driving miles. The lithium-ion battery will be built at GM’s Brownstown Battery Assembly plant in Brownstown, Michigan.

Source: Cadillac