The invention belongs to the technical field of batteries, and particularly discloses a
battery cell, at least one end of a shell of the
battery cell is provided with an opening, a cover plate is arranged at the opening, and the cover plate and the shell jointly define an accommodating space for mounting a pole group. An abutted seam is formed between the circumferential side wall of the cover plate and the inner wall of the shell. In the first direction, the end face of the cover plate away from the pole group side is higher than the end face of the shell towards the cover plate side, so that a step part is formed therebetween. On the outer side, away from the containing space, of the abutted seam, the shell and the cover plate are welded and connected at the step part to form a
welding part, an included angle is formed between the melting direction when the
welding part is formed and the plane where the cover plate is located, the melting direction faces the circumferential side wall of the cover plate, and the plane where the cover plate is located is perpendicular to the first direction. By means of the
welding mode that the
laser for welding the shell and the cover plate inclines relative to the cover plate, the risk that the
laser leaks into the containing space from the abutted seam when the shell and the cover plate are welded is reduced, the pole group is prevented from being burnt, and meanwhile reliable connection between the shell and the cover plate is guaranteed.