A battery cell includes a housing, an electrode assembly, and an electrode terminal. The housing is provided with a wall portion, and a mounting hole is formed on the wall portion. The electrode assembly is accommodated within the housing. The electrode terminal extends through the mounting hole; the electrode terminal includes a first terminal portion and a second terminal portion that are separately provided; the first terminal portion and the second terminal portion are arranged along the thickness direction of the wall portion and connected to each other; at least a part of the first terminal portion is located on a side of the wall portion facing the electrode assembly and electrically connected to the electrode assembly; at least a part of the second terminal portion is located on a side of the wall portion away from the electrode assembly.