Heat preservation method and device for battery of electric vehicle

The invention discloses an heat preservation method and device for a battery of an electric vehicle, and is used for solving the problems that when an existing electric vehicle power battery is in a low-temperature environment, the battery performance is sharply reduced, the power of the electric vehicle is affected, and then normal running of the electric vehicle is affected. The method comprises the steps: when it is monitored that a battery is fully charged, sending a termination instruction to a charging unit, so that the charging unit stops charging the battery in response to the termination instruction; after the charging unit stops charging, collecting the current temperature of the battery, and judging whether the current temperature is smaller than a first temperature threshold value or not; and when it is judged that the current temperature is smaller than the first temperature threshold value, starting a heating system to conduct heat preservation and heating on the battery. 本申请公开了一种电动汽车电池保温方法，用以解决