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 . <EOS>