Battery cell and battery module

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery module. The battery cell comprises an aluminum shell, a core package and a cathode connecting piece, one end of the aluminum shell along the length direction is connected with a cathode top cover, and the other end is connected with an anode top cover; the core bag is arranged in the aluminum shell, the positive pole lug and the negative pole lug respectively extend out of the two sides of the core bag along the width direction, and compared with the arrangement that the positive pole lug and the negative pole lug are respectively arranged at the two ends of the core bag along the length direction in the prior art, the electric conduction path can be shortened, the impedance of the battery cell can be reduced, the power performance of the battery cell can be improved, and the fast charging performance of the battery cell can be improved. The positive pole lug is in contact connection with one side of the