The battery comprises a shell, an installation part and a heat dissipation
assembly, the shell is provided with a through hole, the installation part is connected to the outer surface of the shell, the installation part is provided with a containing cavity, the containing cavity is communicated with the through hole, the heat dissipation
assembly comprises a body part, a heat conduction piece and a heat dissipation piece, the body part is arranged in the shell, and the heat conduction piece is connected with the heat dissipation piece. The heat conduction part is connected to the body part, the heat conduction part penetrates through the through hole and extends into the containing cavity, the heat dissipation part is movably and adjustably arranged in the containing cavity, one end of the heat dissipation part extends to the outer side of the mounting part, and the heat dissipation part can be switched between a first state in contact with the heat conduction part and a second state separated from the heat conduction part when moving. According to the battery and the electric two-wheeled vehicle disclosed by the utility model, heat in the shell can be effectively dissipated in
hot weather, and the influence on the working performance due to over-low temperature of components such as a
battery cell in the shell caused by reverse transfer of external
cooling capacity into the shell through the heat dissipation piece in
cold weather can be avoided.