SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME, AND BATTERY PACK

The present invention relates to a secondary battery. The secondary battery comprises: a can configured to accommodate an electrode assembly; and a cap assembly bonded to an opening of the can, wherein the cap assembly comprises: an upper cap provided in the opening and connected to an electrode tab of the electrode assembly; and a lower cap configured to bond the upper cap to the opening, wherein the lower cap comprises: a first bonding part bonded to a bottom surface of the upper cap to support the upper cap; and a second bonding part formed on an outer circumferential surface of the first bonding part to fix the upper cap while being bonded to the upper cap.