DETROIT — Electric vehicles had another whirlwind year around the globe, driven by buyers in China, and growth in parts of Europe and the United States, despite headwinds. In a milestone for China, the world’s biggest auto market, EVs hit 50% of new car sales in July. That included pure battery EVs plus plug-in hybrid electric vehicles. Chinese companies such as BYD continue to gain traction worldwide with their inexpensive EVs. Electric vehicles also made headway in Europe and the U...