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Siemens Developing Flexible Rapid Charging System for Electric Cars

Siemens and BMW are developing a flexible rapid charging system to make it possible to use the same socket to charge up electric cars on either direct current (DC) or alternating current (AC).

The work is part of the Modellregion Elektromobilität München – Drive eCharged project being funded by Germany’s Ministry of Transport, Building, and Urban Development.

The partners’ goal with the project is to establish their charging concept as an international standard. The system utilizes plugs standardized for AC charging that have been modified to accommodate DC charging. Until now, electric vehicles that can be charged with either AC or DC needed to use two different sockets. The project partners recently presented a prototype of the new charging system in the Transportation section of the Deutsches Museum in Munich.

Charging times and vehicle range are key aspects that influence consumer acceptance of electric cars. Today’s batteries have to be recharged more often than a conventional vehicle needs to be refueled, and the recharging process also takes several hours when a conventional socket is used. Charging times of half an hour or less can be achieved with DC technology, however. Unlike AC systems, with DC technology the power converter is located outside the vehicle at the charging station, which means the cars that use it can be made lighter. This, in turn, increases vehicle range, and combined with short charging times it therefore makes electric vehicles more attractive to fleet operators.

Special charging units are required for this system, however, which is why the Drive eCharged partners have developed a user-friendly approach that offers several advantages over the systems now in use. For example, AC and DC plugs fit into the same socket on the vehicle. The new approach also standardizes communication between the vehicle and charging station for AC and DC operations, which means it will be able to support additional functions like smart charging or bi-directional charging for both charging modes in the future. Over the medium term, it is expected that DC systems will be able to charge a vehicle to the equivalent of a 100-kilometer (62 miles) range in just 15 minutes.

The new system was successfully tested in September 2011 with a Siemens charging station and a BMW ActiveE electric car, and Siemens and BMW have already submitted proposals for standardizing DC charging to the International Electrotechnical Commission (IEC). The two companies are planning to continue this work on standardization.[wzslider height=”400″]

Oct 25, 2011Blagojce Krivevski
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Blagojce Krivevski

Blagojce Krivevski is physicist and green technology lover. Keep in touch with Blagojce through his email, web site, Twitter, Linkedin, Facebook and Google+.

October 25, 2011 Electric Car Newsbmw, Drive eCharged, electric cars, Flexible Rapid Charging System, Rapid Charging, Rapid Charging System, siemens, Siemens Rapid Charging System
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