Power automobile battery heating method and device

The embodiment of the invention provides a power automobile battery heating method and device, and the method comprises the steps: firstly obtaining a battery discharging capability signal, a battery charging capability signal and a charging pile capability signal when a battery heating request signal is received; the available power of a heater is calculated according to the battery discharging capacity signal, the battery charging capacity signal and the charging pile capacity signal; controlling the heater to increase working gears step by step according to the available power of the heater so as to heat the battery; before the working gear of the heater is reduced, the target output power of the charging pile is adjusted according to the battery charging capacity signal; and after the charging pile completes actual output power adjustment according to the target output power, downshift processing is carried out on the heater, and battery loss caused by over-charging and over-discharging of the battery can