A button-type secondary battery including an electrode assembly having a first and second electrode tabs; a lower can having an accommodation part, in which the electrode assembly is accommodated and to which the first electrode tab is connected, and a flange part on an outer circumferential surface of the accommodation part; an upper cap on the accommodation part covering the accommodation part and a curl part on an outer circumferential surface of the cover part; a terminal member coupled to the upper cap and connected to the second electrode tab; and an insulating member configured to insulate the terminal member and the upper cap from each other and seal a gap between the terminal member and the upper cap. The flange part and the curl part are coupled to each other in a seaming manner to seal a gap between the lower can and the upper cap.

An embodiment of the present invention relates to a cylindrical secondary battery comprising: a cylindrical can having a bottom surface and a side portion extending from the bottom surface, one end of the side portion being open to form an opening; an electrode assembly accommodated in the can; and a cap assembly including a gasket which is inserted into the can with the electrode assembly inserted in the can to come into contact with the electrode assembly, and a cap plate which is disposed on the gasket and is electrically connected to the electrode assembly, wherein the can has, at the edge of the opening, a curling portion which presses the gasket to bring the gasket into contact with the cap plate.

An embodiment of the present invention relates to a cylindrical secondary battery comprising: a cylindrical can having a bottom surface and a side portion extending from the bottom surface, one end of the side portion being open to form an opening; an electrode assembly accommodated in the can; and a cap assembly including a gasket which is inserted into the can with the electrode assembly inserted in the can to come into contact with the electrode assembly, and a cap plate which is disposed on the gasket and is electrically connected to the electrode assembly, wherein the can has, at the edge of the opening, a curling portion which presses the gasket to bring the gasket into contact with the cap plate.

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.

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.

A secondary battery is provided including an electrode wound body housed in a battery can, with the electrode wound body having a structure including a band-shaped positive electrode and a band-shaped negative electrode laminated and wound with a separator interposed therebetween, where the positive electrode includes a positive electrode active material layer on both sides of a band-shaped positive electrode foil, the negative electrode includes a negative electrode active material layer on both sides of a band-shaped negative electrode foil, the electrode wound body includes a positive electrode tab at a central part of the positive electrode, includes a negative electrode tab on a winding end side of the negative electrode, and includes a foil tab in a flat plate shape on a winding start side of either one or both of the positive electrode and the negative electrode.

A cylindrical secondary battery may have an insulation layer formed in a region in which the top cap and the first gasket are coupled to each other. The insulation layer may include a ceramic material and a binder. The secondary battery is designed so that, when an external electrical conductive object is electrically connected directly to a positive electrode and a negative electrode of the secondary battery, an electrode tab of the secondary battery is broken as quickly as possible.

A cylindrical secondary battery may have an insulation layer formed in a region in which the top cap and the first gasket are coupled to each other. The insulation layer may include a ceramic material and a binder. The secondary battery is designed so that, when an external electrical conductive object is electrically connected directly to a positive electrode and a negative electrode of the secondary battery, an electrode tab of the secondary battery is broken as quickly as possible.

The present invention relates to a secondary battery. The secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked to be wound, a cylindrical can comprising an accommodation part, in which the electrode assembly is accommodated, the can having an opening, and a cap assembly configured to cover the opening. The cap assembly includes a safety vent comprising a notching part that is ruptured when an internal pressure of the battery increases, the notching part has a circular shape in a plan view, the electrode assembly comprises an electrode tab connected to each of the electrodes, the safety vent is connected to the electrode tab and an external terminal, wherein the electrode tab and the external terminal are connected to different sides of an inner side and an outer side with respect to the notching part in the safety vent in the plane view.

The present invention relates to a secondary battery. The secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked to be wound, a cylindrical can comprising an accommodation part, in which the electrode assembly is accommodated, the can having an opening, and a cap assembly configured to cover the opening. The cap assembly includes a safety vent comprising a notching part that is ruptured when an internal pressure of the battery increases, the notching part has a circular shape in a plan view, the electrode assembly comprises an electrode tab connected to each of the electrodes, the safety vent is connected to the electrode tab and an external terminal, wherein the electrode tab and the external terminal are connected to different sides of an inner side and an outer side with respect to the notching part in the safety vent in the plane view.