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Since late 2006, Denise Gray has been the director of global battery systems engineering at General Motors and one of the key people working to bring the Chevrolet Volt to fruition. Gray has overseen all of the testing and development of batteries going into plug and non-plug versions of GM hybrids and extended-range electric vehicles. Gray has also worked with battery suppliers to evaluate new cell technologies that may be used in production vehicles in the future. We've also spoken with her on

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There was one main message hammered home during a conference call on the Voltec plug-in hybrid propulsion system that GM held earlier today: even though the Chevy Volt is not yet finished, GM is getting the second and third generation Voltec systems ready. Sure, the GM representatives reassured us that the company is on track for a late-2010 launch of the Chevy Volt, all of the mentions of the Gen 2 and Gen 3 Voltec systems made it clear that GM is readying some surprises in their various batter

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For the time being, General Motors is content to let suppliers like A123 Systems, LG Chem and Cobasys focus on cell chemistry for its hybrid and electric vehicle battery packs. GM leaders like Denise Gray and Bob Kruse believe that the key to ensuring that those cells last for (essentially) the life of the car, is in how those cells are managed. One of the killers of advanced rechargeable batteries is extreme temperatures, whether too hot or too cold. In order to ensure the batteries stay in the

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The hybrid battery test lab at the GM Technical Center

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