A decade ago Xi Jinping was welcomed to Duisburg in Germany’s Ruhr valley. He praised the region as a hub for Chinese investment; greeted a train that had spent a fortnight travelling from Chongqing, via Russia, to Europe’s industrial belt; and enjoyed an orchestral performance of traditional mining songs. More recently, another Chinese arrival in Germany received a frostier reception. In February a ship called BYD Explorer No. 1 unloaded 3,000 or so electric cars made by BYD, a Chinese electric-vehicle (EV) firm. As the ship’s name suggests, it is likely to be the first of many. Little surprise that it has prompted worries about the future of Germany’s hallowed carmakers.