BATTERY PACK

A battery pack includes: a battery pack housing; a cell group including multiple cells and accommodated in the battery pack housing; and a monitoring device configured to monitor an ambient temperature at one temperature measurement point or an ambient temperature at each of multiple temperature measurement points in the battery pack housing. A cell includes multiple cell layers, the battery pack further includes a controller configured to control a charging process of the battery pack or a discharging process of the battery pack, the monitoring device is further configured to transmit the monitored ambient temperature to the controller, and the controller is further configured to determine a cell layer temperature of a target cell layer among the multiple cell layers based on at least one ambient temperature and control, based on the cell layer temperature of the target cell layer, the battery pack to be charged or discharge electricity.