Battery assembly, battery and electric device

The utility model provides a battery assembly, a battery and an electric device. The battery assembly comprises a battery module, a heat conduction module and a heat dissipation module, the battery module comprises at least two battery single bodies arranged in the first direction, a pole is arranged at one end of each battery single body in the second direction, the heat conduction module comprises a heat dissipation piece and a first connecting piece, and the first connecting piece is connected to the heat dissipation piece and the heat dissipation module; the heat dissipation piece comprises a conduction part and at least two contact parts, the contact parts are connected to the pole, the conduction part is connected to the two adjacent contact parts so that heat of the pole can enter the heat conduction module through the heat conduction module, the conduction part is connected to the two adjacent contact parts, and the contact parts are connected in series through the conduction part to form the whole he