The invention relates to the technical field of batteries, in particular to a
battery cell cover plate and a
battery cell. The
battery cell cover plate comprises a cover plate main body provided with a
liquid injection hole; the first insulating part is arranged in the battery
cell, a first concave accommodating cavity is formed in one side, facing the cover plate main body, of the first insulating part, and the
liquid injection hole is covered by the projection of the first accommodating cavity on the cover plate main body; the side, facing the interior of the battery
cell, of the first insulating part is provided with a boss abutting against the pole group, the boss is provided with a drainage channel communicating with the first containing cavity and the pole group, at least part of the flowing path of fluid in the drainage channel forms an angle with the axial direction of the
liquid injection hole, and the penetrating part is formed in the side wall of the boss and communicates with the drainage channel. According to the invention, the condition that the diaphragm in the pole group blocks the drainage channel when liquid injection or exhaust is carried out through the liquid injection hole can be improved, so that the
electrolyte flows in smoothly, the
electrolyte injection efficiency is improved, the liquid injection time is shortened, the risk of
electrolyte overflow is reduced, and the stability of exhausting gas through the liquid injection hole in time is improved.