Nio (NIO -0.56%) investors haven't had a very good week. The Chinese electric vehicle (EV) maker's American depositary shares have plunged more than 15% since the U.S. election, including a 13.4% drop this week as of midday Friday, according to data provided by S&P Global Market Intelligence.The U.S. election results help explain the recent bearish move in Nio's stock. Chinese EV makers haven't made any inroads in the United States at this point, but President-Elect Donald Trump's policies push that possibi ...