Disclosed herein is an electrode terminal connecting member to connect two or more battery cells in series and/or in parallel to each other so as to manufacture a battery cell core pack, wherein the electrode terminal connecting member includes a plate body having a size sufficient to connect electrode terminals of the battery cells arranged in at least 2×2 matrix to each other, and the electrode terminals of the battery cells are directly coupled to the plate body in a state in which the plate body is not bent.