The utility model relates to the technical field of batteries, and particularly discloses a battery shell, a battery and a
battery pack. The battery shell comprises a shell body and a blue film, the blue film wraps the outer side wall of the shell body, the outer side wall of the shell body is provided with a plurality of shell planes, every two shell planes are connected through a transition curved surface, one of all the transition curved surfaces is defined as a corner curved surface, and the other transition curved surface is defined as a corner curved surface. The head end of the blue film and the
tail end of the blue film are partially overlapped to form an overlapping part, and the overlapping part is arranged on the corner curved surface and does not exceed the adjacent shell plane. According to the battery shell, the overlapping part is limited to the curved surface of the corner, so that the
energy density of the battery is improved, the reliability of blue
film coating is enhanced, the production yield is improved, the
film coating process is simplified, and the blue
film coating structure and mode of the battery shell are improved.