A battery system, comprising: a carrier frame accommodating a plurality of removable battery component carriers, wherein each of the removable battery component carrier accommodates at least one battery submodule comprising a plurality of battery cells and is individually detachable from the carrier frame, and is mechanically and electrically connected to other removable battery component carriers and/or to the carrier frame, the removable battery component carrier comprising: a bottom plate; a pair of side walls perpendicular to the bottom plate and extending along two opposite longitudinal edges of the bottom plate; a pair of end plates perpendicular to the bottom plate and to the side walls and extending along two opposite transversal edges of the bottom plate, the end plates being mechanically coupled to the pair of side walls and/or to the bottom plate for fixing the plurality of battery cells together; and a cell cover extending parallel to the bottom plate so that the cell cover, the bottom plate, the side walls and the end plates form a accommodating space for the battery sub-module, and characterized in that the cell cover comprises a pair of clamps located at a side portion of the cell cover and extending in a downward direction, the pair of clamps being configured to be inserted between the battery cells and the side walls. a carrier frame accommodating a plurality of removable battery component carriers, wherein each of the removable battery component carrier accommodates at least one battery submodule comprising a plurality of battery cells and is individually detachable from the carrier frame, and is mechanically and electrically connected to other removable battery component carriers and/or to the carrier frame, the removable battery component carrier comprising: a bottom plate; a pair of side walls perpendicular to the bottom plate and extending along two opposite longitudinal edges of the bottom plate; a pair of end plates perpendicular to the bottom plate and to the side walls and extending along two opposite transversal edges of the bottom plate, the end plates being mechanically coupled to the pair of side walls and/or to the bottom plate for fixing the plurality of battery cells together; and a cell cover extending parallel to the bottom plate so that the cell cover, the bottom plate, the side walls and the end plates form a accommodating space for the battery sub-module, and characterized in that the cell cover comprises a pair of clamps located at a side portion of the cell cover and extending in a downward direction, the pair of clamps being configured to be inserted between the battery cells and the side walls. a bottom plate; a pair of side walls perpendicular to the bottom plate and extending along two opposite longitudinal edges of the bottom plate; a pair of end plates perpendicular to the bottom plate and to the side walls and extending along two opposite transversal edges of the bottom plate, the end plates being mechanically coupled to the pair of side walls and/or to the bottom plate for fixing the plurality of battery cells together; and a cell cover extending parallel to the bottom plate so that the cell cover, the bottom plate, the side walls and the end plates form a accommodating space for the battery sub-module, and characterized in that the cell cover comprises a pair of clamps located at a side portion of the cell cover and extending in a downward direction, the pair of clamps being configured to be inserted between the battery cells and the side walls.