Small Battery Pack of Improved Safety

Provided is a battery pack, which is manufactured in a low cost, exhibits proper strength even without using the conventional pack external members, has a slim and compact structure, and has excellent resistance to a short circuit caused by external shocks. The battery pack comprises: a battery cell(100) in which an electrode assembly is accommodated in a receiving part of a laminate sheet pouch type battery case formed of a high-strength material including resin layers and metal layers and is sealed, side sealing parts(120,130) of the battery case form the curved circumferences, and end parts of the side sealing parts(120,130) are bended toward the receiving part; a protection circuit module(400) which is fitted in the lower end of the battery cell(100); and connection members(300,310) which are located in the inside spaces(S) of the bended side sealing parts(120,130) to electrically connect the protection circuit module(400) with the electrode terminals at the top of the battery cell(100).