DDG says:
http://www.hybridcars.com/teardown-reveals-bmw-i3-is-most-ad...
http://www.bmwblog.com/2015/01/05/reverse-engineering-bmw-i3...
http://www.forbes.com/sites/joannmuller/2015/01/04/video-unl...
But for more you'll just have to do some searching.