Battery charger

The invention relates to a battery charger which comprises a charger body and a heat dissipation device located in the charger body, the heat dissipation device comprises a heat dissipation bag and a driving mechanism, and the driving mechanism is used for driving the heat dissipation bag to move close to or away from a rechargeable battery. Through the arrangement of the heat dissipation bag and the driving mechanism, the heat dissipation bag is in contact with the surface of the rechargeable battery for heat exchange, so that the temperature of the rechargeable battery in the charging process is reduced, and the use performance of the battery is maintained; moreover, the distance between the heat dissipation bag and the rechargeable battery is controlled through the driving mechanism, so that different heat dissipation modes are formed to adapt to different charging working conditions. 本申请涉及一种电池充电器，包括充电器主体、位于充电器主体内的散热装置，散热装置包括散热袋和驱动机构，其中驱动机构用于带动散热袋靠近或远离充电电池运动。本申请通过设置散热袋和驱动机构，利用散热袋与充电电池表面的接触，以进行热交换，从而降低充电电池充