An exhibitor introduces an intelligent flexible charging robot at the World New Energy Vehicle Congress in Haikou, capital of South China's Hainan province, on Sept 15, 2021. (Photo/Xinhua)
An exhibitor, right, introduces a fully automatic mini power changing station at the World New Energy Vehicle Congress in Haikou, capital of South China's Hainan province, on Sept 15, 2021. (Photo/Xinhua)
Model of fuel cell stack is on display at the World New Energy Vehicle Congress in Haikou, capital of South China's Hainan province, on Sept 15, 2021. (Photo/Xinhua)
