Secondary battery and manufacturing method thereof
A secondary battery according to one or more embodiments of the present disclosure includes a case for accommodating an electrode assembly in an internal accommodating space, a cap plate, a first terminal inserted into the cap plate in a first direction, and bent at an inner surface of the cap plate to be coupled to the cap plate, and a collector plate in the case, electrically connected to a first electrode of the electrode assembly, and coupled to the first terminal in the first direction.
1 . A secondary battery comprising:
a case for accommodating an electrode assembly in an internal accommodating space;
a cap plate;
a first terminal inserted into the cap plate in a first direction, defining a first hollow, and bent at an inner surface of the cap plate to be coupled to the cap plate; and
a collector plate in the case, electrically connected to a first electrode of the electrode assembly, and coupled to an interior of the first terminal defining the first hollow,
wherein the first terminal comprises a terminal portion forming an upper surface thereof, a coupling portion formed under the terminal portion and defining the first hollow therein, and a deformed portion defining a second hollow having a larger diameter than that of the first hollow,
wherein the collector plate comprises a protrusion,
wherein the protrusion defines a third hollow,
wherein a lower surface of the terminal portion is exposed inside the first hollow of the coupling portion,
wherein an upper surface of the protrusion is welded to the lower surface of the terminal portion exposed through the first hollow of the coupling portion, and
wherein a side surface of the protrusion directly contacts a side surface of the coupling portion.
2 . The secondary battery of claim 1 , further comprising an insulation plate between the first terminal and the cap plate.
3 . The secondary battery of claim 2 , wherein an end of the insulation plate is bent with the first terminal.
4 . The secondary battery of claim 2 , wherein a lower portion of the deformed portion is coupled with a lower surface of the insulation plate.
5 . The secondary battery of claim 1 , wherein the cap plate is integral with the case, and constitutes one surface of the case.
6 . The secondary battery of claim 1 , wherein the collector plate further comprises a variable coupling portion, and wherein the variable coupling portion is coupled to the first electrode.