Cylindrical battery pack and pack method

The invention relates to a cylindrical battery pack and a pack method. The cylindrical battery pack comprises cylindrical batteries and supports arranged at the two ends of the cylindrical batteries, wherein a plurality of positioning grooves matched with the cylindrical batteries are formed in the sides, facing the cylindrical batteries, of the supports, and center holes penetrating through the back faces of the supports are formed in the bottom faces of the positioning grooves; a connecting piece which is inserted into the central holes to be connected with the electrodes of the cylindrical batteries and comprises a bent section and two connecting sections, wherein the connecting sections surround the convex cap of the cylindrical battery, and the bent section is connected with the two connecting sections; and a fixing piece which is used for connecting the two supports along the axial direction of the cylindrical batteries and fixing the cylindrical batteries between the supports. The cylindrical battery p