A battery module, comprising: a base plate; a plurality of battery cells, having a pair of electrode leads (21,22) drawn therefrom in the same direction, disposed on the base plate and arranged to form two rows; wherein in case of a pair of battery cells arranged in a same column, electrode leads (21,22) of the battery cell arranged in the first row and electrode leads (21,22) of the battery cell arranged in the second row extend in opposite directions; wherein the electrode leads (21,22) of the battery cell arranged in the first row and the electrode leads (21,22) of the battery cell arranged in the second row are disposed alternately; a plurality of sockets electrically connected to electrode leads (21,22) of the battery cells; and wherein the socket includes: a first support electrically connected to the electrode leads (21,22) of the battery cell arranged in the first row; and a second support electrically connected to the electrode leads (21,22) of the battery cell arranged in the second row and electrically insulating from the first support; and a plurality of connecting bars inserted into a part of the plurality of sockets, wherein one side of a connecting bar is inserted into a first support and another side of a connecting bar is inserted into a second support to electrically connect the first support and the second support, so that the plurality of battery cells are connected in a combined serial and parallel pattern. a base plate; a plurality of battery cells, having a pair of electrode leads (21,22) drawn therefrom in the same direction, disposed on the base plate and arranged to form two rows; wherein in case of a pair of battery cells arranged in a same column, electrode leads (21,22) of the battery cell arranged in the first row and electrode leads (21,22) of the battery cell arranged in the second row extend in opposite directions; wherein the electrode leads (21,22) of the battery cell arranged in the first row and the electrode leads (21,22) of the battery cell arranged in the second row are disposed alternately; a plurality of sockets electrically connected to electrode leads (21,22) of the battery cells; and wherein the socket includes: a first support electrically connected to the electrode leads (21,22) of the battery cell arranged in the first row; and a second support electrically connected to the electrode leads (21,22) of the battery cell arranged in the second row and electrically insulating from the first support; and a plurality of connecting bars inserted into a part of the plurality of sockets, wherein one side of a connecting bar is inserted into a first support and another side of a connecting bar is inserted into a second support to electrically connect the first support and the second support, so that the plurality of battery cells are connected in a combined serial and parallel pattern. a first support electrically connected to the electrode leads (21,22) of the battery cell arranged in the first row; and a second support electrically connected to the electrode leads (21,22) of the battery cell arranged in the second row and electrically insulating from the first support; and a plurality of connecting bars inserted into a part of the plurality of sockets, wherein one side of a connecting bar is inserted into a first support and another side of a connecting bar is inserted into a second support to electrically connect the first support and the second support, so that the plurality of battery cells are connected in a combined serial and parallel pattern.