The invention provides a battery pack, comprising a battery or battery set as well as a switch control unit connected with the battery or battery set; wherein the switch control unit can cause the battery or battery pack to be in short circuit, so that the temperature of the battery or battery set is increased. The battery pack provided by the invention has simple structure, the volume of the battery or battery set can not increased too much, thus effectively saving the space of electronic equipment or electronic device; and the temperature of a battery system in low temperature environment can be effectively increased, thus fully ensuring the low temperature charging discharging property of the battery pack, and meanwhile the battery or battery set is not substantially changed, thus ensuring other battery properties of the battery pack.