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Pub. No.:    WO/2017/179768    International Application No.:    PCT/KR2016/008011
Publication Date: Fri Oct 20 01:59:59 CEST 2017 International Filing Date: Sat Jul 23 01:59:59 CEST 2016
IPC: H01M 10/058
H01M 2/04
Applicants: SAMSUNG SDI CO., LTD.
Inventors: LEE, Won Jin
The present invention relates to a secondary battery which is manufactured in a manner that a case is sealed by bonding. The secondary battery may comprise: an electrode assembly including a cathode plate, an anode plate, and a separator; a case having a hexahedron shape with an opened side for housing the electrode assembly; a cap assembly which is bonded to the opened side of the case and seals the electrode assembly against the outside; and a protective cover which is made of a heat insulating material and is disposed between the cap assembly and the electrode assembly inside the case, wherein an edge of the protective cover near the cap assembly is chamfered or a region of the side facing the case corresponding to the bonding line of the case is recessed toward the electrode assembly, to thereby form a disengaging section.