Although the cumulative sales of electric vehicles in the world has reached more than 1 million, the construction of charging facilities is becoming more and more perfect, but to achieve real popularity, price is still the biggest consideration in consumers' minds Recently, the United States General Motors Group (GM) held a global conference in Michigan, the company's executive MarkReuss mentioned that the future cost of electric vehicle lithium-ion battery is expected to drop to 145 US dollars / kWh, and even more likely to reach 100 after 2021.