Abstract: The present invention provides a unit cell aligning device, including a first conveying unit which conveys a unit cell including an electrode and a separation membrane in a first direction; a first vision unit that measures a twisted angle of the electrode; a gripper that grips and moves the unit cell; and a control unit that controls the gripper, wherein the control unit adjusts an angle of the gripper on the basis of the twisted angle of the electrode measured by the first vision unit before the gripper grips the unit cell, and returns the gripper so that the angle of the gripper becomes an angle before adjustment after the gripper grips the unit cell.

Abstract: Disclosed herein are a method for welding electrode taps of a secondary battery which improves insulation defects generated during welding between the electrode taps and lead parts and an electrode assembly manufactured thereby. The method for welding electrode taps includes performing main welding to connect electrode taps protruded from electrode plates provided in a battery and lead parts electrically connecting the electrode taps to external terminals and having a lead film on the surfaces thereof and, in main welding, a welding part is formed in a partial section of an overlapping region between the electrode tap and the lead part, and a non-welding section is formed between the welding part and the lead film.

Abstract: Disclosed herein are a method for welding electrode taps of a secondary battery which improves insulation defects generated during welding between the electrode taps and lead parts and an electrode assembly manufactured thereby. The method for welding electrode taps includes performing main welding to connect electrode taps protruded from electrode plates provided in a battery and lead parts electrically connecting the electrode taps to external terminals and having a lead film on the surfaces thereof and, in main welding, a welding part is formed in a partial section of an overlapping region between the electrode tap and the lead part, and a non-welding section is formed between the welding part and the lead film.