Patent ID: 9160029
Filing Date: 2015-10-13
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery comprising: an electrode assembly; a can having an opening configured to receive the electrode assembly, wherein the can includes a first stepped portion having a first depth and a second stepped portion having a second depth different from the first depth, both the first stepped portion and the second stepped portion being on an inner surface adjacent to the opening; a cap assembly comprising a cap plate hermetically sealing the opening of the can; and an insulation case located between the electrode assembly and the cap assembly, the insulation case having a chamfered edge, wherein the insulation case comprises a body, a first side support and a second side support both extending away from the body, wherein the second side support is longer than the first side support, and at least one protrusion overlapping the second side support; wherein the at least one protrusion extends between a first end and a second end, the second end being closer to the electrode assembly than the first end and wherein the at least one protrusion has a constant maximum thickness from the first end to the second end at which the at least one protrusion forms the chamfered edge which is chamfered inwardly towards the insulation case.