The utility model provides a battery
monomer and a
battery pack, and relates to the technical field of batteries. The battery
monomer has a first direction and comprises a shell, a pole, an
electrode assembly, an anti-explosion valve and a protection piece, the shell is provided with a through hole penetrating in the first direction. The pole penetrates through the shell; the
electrode assembly is arranged in the shell and is electrically connected with the pole; the anti-explosion valve is connected with the shell to seal and cover the through hole; the protection piece is connected with the side, away from the
electrode assembly, of the shell in the first direction, the protection piece and the anti-explosion valve are arranged in a spaced mode in the first direction, the protection piece is provided with a ventilation opening penetrating in the first direction, and a part of the protection piece protrudes in the direction away from the anti-explosion valve in the first direction. According to the battery
monomer provided by the invention, when the battery monomer encounters an
impact working condition, the protection piece can bear the
impact of part of external
impact force on the anti-explosion valve, so that the
failure risk of the anti-explosion valve is reduced, and the safety of the battery monomer is improved.