A secondary battery, comprising a battery cell (300, 400) having an electrode assembly of a cathode/separator/anode structure disposed in a battery case in a sealed state, an electrode lead (310, 410), and a safety connection member connected to at least one electrode terminal of the battery cell (300, 400), wherein the safety connection member comprises a safety element, a horizontal connection terminal (a) connected to one end of the safety element, and a vertical connection terminal (b) connected to the other end of the safety element, the safety connection member being connected to at least one electrode terminal of the battery cell (300, 400) to form the external input and output terminal of the battery cell (300, 400), wherein the battery cell (300, 400) is a battery cell (300, 400) having a pouch-shaped battery case, the pouch-shaped battery case comprising sealing parts (330, 430), and wherein (i) the horizontal connection terminal (a) of the safety connection member is connected to an electrode lead (310, 410) of the battery cell (300, 400) such that the vertical connection terminal (b) of the safety connection member is directed toward the lower part of the battery cell (300, 400), and the horizontal connection terminal of the safety connector member is connected to the electrode lead located at an upper end of the battery cell, (ii) the electrode lead (310, 410) of the battery cell (300, 400) has a downward bend such that the safety connection member is rotated 180 degrees, and is exposed outside the pouch-shaped battery case, (iii) the sealing parts (330, 430) of the pouch-shaped battery case have perpendicular bends, respectively, to a main surface of the battery case such that the sealing parts (330, 430) are in tight contact with the outer surface of an electrode assembly receiving part of the battery cell (300, 400), and (iv) the vertical connection terminal (b) of the safety connection member has an upward vertical bend, which forms the external input and output terminal, (v) the safety connection member is a thermal fuse of which opposite ends are respectively connected to the horizontal connection terminal (a), wherein the electrode terminal of the battery cell (300, 400) is formed by connecting a plurality of electrode tabs (40, 50) extending from the electrode assembly to the electrode lead (310, 410). (i) the horizontal connection terminal (a) of the safety connection member is connected to an electrode lead (310, 410) of the battery cell (300, 400) such that the vertical connection terminal (b) of the safety connection member is directed toward the lower part of the battery cell (300, 400), and the horizontal connection terminal of the safety connector member is connected to the electrode lead located at an upper end of the battery cell, (ii) the electrode lead (310, 410) of the battery cell (300, 400) has a downward bend such that the safety connection member is rotated 180 degrees, and is exposed outside the pouch-shaped battery case, (iii) the sealing parts (330, 430) of the pouch-shaped battery case have perpendicular bends, respectively, to a main surface of the battery case such that the sealing parts (330, 430) are in tight contact with the outer surface of an electrode assembly receiving part of the battery cell (300, 400), and (iv) the vertical connection terminal (b) of the safety connection member has an upward vertical bend, which forms the external input and output terminal, (v) the safety connection member is a thermal fuse of which opposite ends are respectively connected to the horizontal connection terminal (a), wherein the electrode terminal of the battery cell (300, 400) is formed by connecting a plurality of electrode tabs (40, 50) extending from the electrode assembly to the electrode lead (310, 410).