Patent ID: 8691425

Claim:
A polymer battery pack comprising: a core pack formed by attaching a protection circuit member to a bare cell, the bare cell comprising a pouch forming a sealed upper region of the bare cell, and at least one electrode tab extending through the sealed upper region; a case to house the bare cell, the case having a first end; and a cap disposed at the first end of the case, formed of a resin that is filled and hardened into and directly contacts and surrounds both the protection circuit member and the sealed upper region of the bare cell, the cap having an opening through which an electrode terminal of the protection circuit member is exposed to an exterior of the cap, wherein the case comprises: two long-sided parts formed of stainless steel, separated by a predetermined distance from each other; a first short-sided part formed of stainless steel, connecting first ends of the long-sided parts with each other, and having an area smaller than an area of either of the long-sided parts; a second short-sided part formed of resin, connecting second ends of the long-sided parts with each other, and having an area smaller than the area of either of the long-sided parts; and a bottom part formed of resin, commonly connected to the long-sided parts, the first short-sided part, and the second short-sided part, located at a second end of the case that opposes the first end of the case, wherein the two long-sided parts and the first short-sided part are integrally formed, and the second short-sided part and the bottom part are integrally formed, and wherein the first end of the case is opened, so that the protection circuit member and the sealed upper region of the bare cell extend outside of the case.