In recent years, the traditional automotive industry has witnessed new opportunities and transformations, featuring connectivity, electrification and intelligence. As one of the ten key industries in "Made in China 2025", the new energy vehicle industry has not only promoted energy conservation and emission reduction, industrial upgrading and ecological civilization in China, but also represents the future development trend of the global automotive industry. Although the development history of new energy vehicles in China is relatively short, many domestic auto brands have embarked on the internationalization process, taking the lead in laying out the European and American markets and seeking further expansion in overseas markets, thus fostering new growth momentum for China's exports. Typical new energy vehicle enterprises that have achieved international operations include BYD, Geely, JAC, BAIC, SAIC and Changan, which have advantages in global industrial chain layout such as product research and development, quality certification and power batteries in international competition. Against this background, this paper takes BYD's new energy vehicles as a research case to analyze the internationalization drivers of Chinese new energy vehicle enterprises and study their internationalization development models. It also analyzes the international operation performance of BYD's new energy vehicles through financial indicators, summarizes the problems faced in the internationalization process, and then offers suggestions. This has important reference value and practical significance for Chinese new energy vehicle enterprises to further enhance their international market competitiveness and explore broader international markets.