▎ 摘　　要

NOVELTY - The utility model claims an electric vehicle battery heating and heat preservation device, comprising a coating body for covering the electric vehicle battery, the coating body comprises a heating layer and a heat insulating layer set at the outer side of the heating layer; the heating layer is a graphene heating layer. The heating and heat preservation device has more stable heating performance, high electric heating conversion efficiency and fast heating speed. In addition, the utility model further claims an electric vehicle battery and electric vehicle using the electric vehicle battery heating and heat preservation device, which will not lose the corresponding endurance mileage due to excessive energy consumption due to the excessive energy consumption when the battery is heated in winter, and the effect of improving the endurance mileage is better after adding.