Secondary battery
A secondary battery includes: a cylindrical case; an electrode assembly accommodated in the cylindrical case and including a positive electrode and a negative electrode; and a cap assembly sealing the cylindrical case. The cap assembly includes: a cap-up electrically connected to the positive electrode; a terminal plate coupled to an upper portion of the cap-up and electrically connected to the negative electrode; and a first insulating gasket between the cap-up and the terminal plate.
1 . A secondary battery comprising:
a cylindrical case;
an electrode assembly accommodated in the cylindrical case and comprising a positive electrode and a negative electrode; and
a cap assembly sealing the cylindrical case and comprising:
a cap-up electrically connected to the positive electrode;
a terminal plate coupled to an upper portion of the cap-up and electrically connected to the negative electrode; and
a first insulating gasket between the cap-up and the terminal plate,
wherein the cylindrical case has a crimping part bent inwardly at an upper part of the cap assembly,
wherein the crimping part covers a portion of the terminal plate and
wherein the first insulating gasket is entirely below a side surface of the terminal plate facing toward a center of the cylindrical case.
2 . The secondary battery of claim 1 , wherein the terminal plate is electrically connected to the cylindrical case.
3 . The secondary battery of claim 1 , wherein the cylindrical case has a beading part recessed inwardly at a lower part of the cap assembly.
4 . The secondary battery of claim 1 , wherein the terminal plate is above an edge of the cap-up and exposes a central portion of the cap-up that protrudes upwardly therefrom.
5 . The secondary battery of claim 1 , wherein an area of the terminal plate corresponds to an area of an edge of the cap-up.
6 . The secondary battery of claim 1 , wherein the first insulating gasket is between an edge of the cap-up and the terminal plate, and
wherein an area of the first insulating gasket is larger than that of the terminal plate.
7 . The secondary battery of claim 1 , wherein the first insulating gasket comprises an extension part extending upwardly and covering a side surface of the terminal plate nearest to the cylindrical case.
8 . The secondary battery of claim 1 , further comprising a second insulating gasket between the cap-up and the cylindrical case.
9 . The secondary battery of claim 1 , further comprising:
a vent plate under the cap-up and having a notch;
a cap-down under the vent plate and having a plurality of through holes; and
an insulator between the vent plate and the cap-down.
10 . The secondary battery of claim 1 , wherein the cylindrical case has a notch in a bottom surface thereof.