Nio (NIO 2.62%) is making huge strides. The Chinese automaker projects it will sell a staggering 450,000 units this year, more than double its sales from last year. With such explosive growth, investors may be wondering if it's time to get on board and invest in the automaker.While Nio is charging ahead in the electric vehicle race, it faces fierce competition in its home market and has to navigate the complex landscape of global geopolitical tensions. With the stock priced under $5 --$4.47 at 9:30 a.m. ET ...