Secondary battery and method of assembling the same

The present invention is directed to a secondary battery comprising an electrode assembly (110), a collecting terminal (122) electrically connected to the electrode assembly, a terminal plate electrically connected to the collecting terminal, the terminal plate including a groove (123b), and a coupling terminal (124) connected to the terminal plate, wherein the coupling terminal comprises an insertion part (124a) coupled with the groove of the terminal plate. The invention further provides a method of assembling a secondary battery, the method comprising coupling a collecting terminal to an electrode assembly, coupling a terminal plate to the collecting terminal, the terminal plate including a groove, and coupling a coupling terminal to the terminal plate by sliding an insertion part of the coupling terminal into the groove of the terminal plate.