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Tuesday, 27 September 2011

Project succeeds in developing electric car battery with greater range

Sept 27, 2011

A project led by advanced battery manufacturer Axeon and co-funded by the Technology Strategy Board has been successful in developing a new battery for use in electric cars that offers over a 35% improvement in range compared to existing technologies, for the same weight.

In 2009, the Technology Strategy Board awarded over £680k of funding to the consortium led by Axeon (bringing the total project funding to over £1.3m), with the aim of developing an innovative high energy density battery system for an emission-free electric vehicle.

The battery uses Nickel Cobalt Manganese (NCM) electrochemistry which theoretically requires 50% less volume and 30% less mass when compared to Lithium Iron Phosphate chemistry (at cell level)

A key goal of the project was to confirm that these cell level benefits pass through to the battery pack level when taking into account overall packaging, cell retention, cooling and interconnects, Battery Management System (BMS) components and overall system functionality.

The project included subjecting the battery to automotive environmental validation testing and the learning from this has been incorporated into the final design to ensure a robust solution.

Axeon and its partners, Ricardo and Allied Vehicles, have now delivered an advanced demonstrator that has been deployed into a test vehicle, increasing its range, functionality and performance. The project has confirmed that it is feasible to replace Lithium Iron Phosphate technology with NCM and that the majority of cell level benefits migrate to battery pack level.

The demonstrator pack uses NCM “pouch” cells (a relatively new technology for electric vehicles) that have been innovatively packaged in modular building blocks which additionally support a range of thermal mamagement options and additionally allow Axeon to support rapid prototyping into a range of other vehicle types with significantly reduced development lead times.

Added benefits of the new system, which was tested on a vehicle platform from Allied Vehicles, include increased ground clearance, better driver experience due to improved weight distribution and more power giving better drivability.

The new battery also integrates an automotive BMS developed by Ricardo. This works with multiple cell chemistries, has active balancing and delivers diagnostic and prognostic information to the vehicle control system.

The partners are now in active discussions on commercialisation of the new technologies.

Source: Axeon


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