Patent ID: 8304107
Filing Date: 2012-11-06
Classification: H01M,Y02E,Y02P

Abstract:
1. A cylindrical lithium rechargeable battery, comprising: an electrode assembly comprising a first electrode plate, a second electrode plate, and a separator arranged between the first electrode plate and the second electrode plate, the electrode assembly having a cavity at its central portion; a core member comprising a plurality of wing sections, the core member being arranged in the cavity, and the core member made of a material that is softer than steel use stainless and that has a specific gravity lower than that of steel use stainless; a case in which the electrode assembly and the core member are arranged, the case comprising an opening arranged at an upper portion of the case; and a cap assembly coupled with the upper portion of the case, the cap assembly sealing the case, wherein the core member is enclosed within the case, wherein upper and lower end portions of the wing sections are chamfered and spaced apart by a non-chamfered portion, wherein each wing section is rectangular with two rounded edges on at least a portion where the core member is non-chamfered, the two rounded edges spaced apart from each other by a planar portion on at least the portion where the core member is non-chamfered, wherein the wing sections are separated by grooves arranged lengthwise along the outer walls of the core member, wherein each wing section is arranged opposite to a groove, and wherein the two rounded edges are spaced apart from adjacent grooves.