A battery module comprising: a battery group including a plurality of battery columns, the battery columns include at least a first battery column and a second battery column each including a plurality of battery cells, wherein the first and second battery columns are stacked into a triangular shape while being displaced in the column direction by a length substantially equal to a radius of a circumference of an external shape associated with the battery cells; wherein stacked into a triangular shape is the arrangement in which the centers of the end surfaces of two adjacent battery cells in one column and the center of the end surface of the battery cell in another column adjacent to the one column, which is between the two battery cells adjacent to the one column, form a substantially regular triangle; and a connection terminal portion coupled with terminal planes of the battery cells, wherein the connection terminal portion includes a coupling portion including a first coupling portion (91R1) configured to couple at least with the first battery column and a second coupling portion (91R2) configured to couple at least with the second battery column adjacent to the first battery column, and an extension portion (91R3) comprising an end that is assumed as a sensing position S 1, at which each voltage of the first and the second battery column is detected, characterized in that the extension portion (91R3) extends from an end of the coupling portion in a longitudinal direction, which is in parallel to a column direction of the first and the second battery column, when a horizontal distance between the first battery column and the second battery column is L and a center line (d) between the first and second battery columns is set, a center (p) of an extension starting end (t) of the extension portion (91R3) is between a position of the horizontal distance L/12 on the second coupling portion side (91R2) from the center line (d) and the center line (d) of the coupling portion, and wherein the first coupling portion (91R1) corresponds to an approximately half portion on the front side sectioned by the center line (d) and the second coupling portion (91R2) corresponds to an approximately half portion on the rear side sectioned by the center line (d), and the extension portion (91R3) is provided in a manner that a distance between a battery cell in the first battery column and the sensing position S 1 and a distance between a battery cell in the second battery column and the sensing position S 1 is such that a voltage sensed at the sensing position S 1 is not being influenced by a voltage drop due to the resistance of the connection terminal portion. a battery group including a plurality of battery columns, the battery columns include at least a first battery column and a second battery column each including a plurality of battery cells, wherein the first and second battery columns are stacked into a triangular shape while being displaced in the column direction by a length substantially equal to a radius of a circumference of an external shape associated with the battery cells; wherein stacked into a triangular shape is the arrangement in which the centers of the end surfaces of two adjacent battery cells in one column and the center of the end surface of the battery cell in another column adjacent to the one column, which is between the two battery cells adjacent to the one column, form a substantially regular triangle; and a connection terminal portion coupled with terminal planes of the battery cells, wherein the connection terminal portion includes a coupling portion including a first coupling portion (91R1) configured to couple at least with the first battery column and a second coupling portion (91R2) configured to couple at least with the second battery column adjacent to the first battery column, and an extension portion (91R3) comprising an end that is assumed as a sensing position S 1, at which each voltage of the first and the second battery column is detected, characterized in that the extension portion (91R3) extends from an end of the coupling portion in a longitudinal direction, which is in parallel to a column direction of the first and the second battery column, when a horizontal distance between the first battery column and the second battery column is L and a center line (d) between the first and second battery columns is set, a center (p) of an extension starting end (t) of the extension portion (91R3) is between a position of the horizontal distance L/12 on the second coupling portion side (91R2) from the center line (d) and the center line (d) of the coupling portion, and wherein the first coupling portion (91R1) corresponds to an approximately half portion on the front side sectioned by the center line (d) and the second coupling portion (91R2) corresponds to an approximately half portion on the rear side sectioned by the center line (d), and the extension portion (91R3) is provided in a manner that a distance between a battery cell in the first battery column and the sensing position S 1 and a distance between a battery cell in the second battery column and the sensing position S 1 is such that a voltage sensed at the sensing position S 1 is not being influenced by a voltage drop due to the resistance of the connection terminal portion.