As the economy develops and the people's living standards improve, the number of cars in the world has maintained rapid growth, which is threatening the ecological environment. Driven by the energy conservation policy, renewable energy generation will get rapid development. Thus, the electric car is the best complement to renewable energy. Growing the electric car can not only satisfy the needs of people's travel but also promote energy conservation and emissions reduction, which can be the strategic direction of the development of the auto industry. In this article, we will discuss a delay charging model: A part of batteries in day high electricity consumption period will not be charged until low electricity consumption period arrives.