What will Musk and CATL Chairman Zeng Yuqun discuss after a year? Musk's frequency of meeting with CATL Chairman Zeng Yuqun has increased to once a year. According to Reuters, on April 29th, CATL Chairman Zeng Yuqun visited Musk's hotel in Beijing. The Tesla CEO arrived in Beijing a day ago for an unannounced visit. CATL is Tesla's main battery supplier, and according to witnesses, Zeng Yuqun came out of the elevator and shook hands with two Tesla Chinese executives waiting in the lobby.