This facility, covering almost 2 square miles in Ningde, in southeastern China, is designed to produce 60 gigawatt-hours of EV batteries annually, enough to power 1 million Model Ys for Tesla Inc. It’s the flagship manufacturing hub for one of the world’s most important automotive companies, Contemporary Amperex Technology Co. Ltd., or CATL. More than 1 out of every 3 EVs made this year had a CATL battery inside, according to data from South Korea-based SNE Research—including cars from BMW, Ford, Honda, Mercedes and Tesla, as well as Chinese brands such as Xiaomi. In May the company raised $5.3 billion by selling shares in Hong Kong, and its 57-year-old founder, Yuqun “Robin” Zeng, is now one of the 30 wealthiest people on the planet, according to the Bloomberg Billionaires Index, with an estimated fortune of $58.3 billion.