By Victoria Waldersee BERLIN, April 25 (Reuters) - A German-funded consortium of carmakers and battery producers, including BMW, Umicore and BASF, is to develop a "battery passport" that traces the content and carbon footprint of batteries in Europe, Germany's economy ministry said on Monday. The consortium of 11 partners has received 8.2 million euros ($8.78 million) of government funding to develop a...