Patent ID: 8651896

Claim:
A connection member for secondary batteries to achieve electrical connection in a battery pack including two or more cylindrical secondary batteries in a physical contact manner, the connection member comprising terminal connection units for electrically connecting two or more battery cells arranged in a lateral direction in a physical contact manner, each of the terminal connection units comprising: (a) an outer circumferential contact part configured to correspond to the external shape of an electrode terminal of the corresponding battery cell, the outer circumferential contact part contacting the electrode terminal of the corresponding battery cell at a region adjacent to the outer circumference of the electrode terminal, the outer circumferential contact part having a predetermined width; (b) upward protruding parts tapered upward from the outer circumferential contact part toward a central axis of each terminal connection unit for elastically supporting the corresponding battery cell; (c) a pressing part protruding from the upward protruding parts to a predetermined height toward the central axis of each terminal connection unit for achieving the physical contact between the battery cells and the connection member; and (d) a depressed part formed on the central axis of each terminal connection unit in a depressed shape by a depth less than the sum of the height of the upward protruding parts and the height of the pressing part, wherein the terminal connection units are electrically connected to each other in correspondence to the number of the battery cells arranged in the lateral direction, wherein the upward protruding part is provided with two or more cut-off parts, having a predetermined width, formed toward the central axis of each terminal connection unit for controlling an elastic force, and wherein the cut-off parts are arranged in the shape of a whirlpool to effectively provide a flexible elastic force.