A battery header cap and an assembly method thereof are provided, and the battery header cap includes a battery, a battery header, an insulating sleeve, and a header cap. The battery includes a battery body and a battery case, and the battery case has a header groove near a case opening. The battery header is disposed at the case opening, and the insulating sleeve completely covers the metal surface of the battery header cap. The header cap includes an electrode plane and a sidewall, the electrode plane has a header cap opening to expose the metal electrode, the electrode plane is disposed on the insulating sleeve, the sidewall covers the end of the battery case, and the end of the sidewall is embedded into the header groove. The structure provides support and insulating protection for the header and also enhances the sealability of the case.

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 cylindrical secondary battery includes: an electrode assembly including a positive electrode plate having a positive electrode multi-tab, a separator, and a negative electrode plate having a negative electrode multi-tab, the positive electrode plate, the separator, and the negative electrode plate being laminated and wound; a cylindrical can accommodating the electrode assembly; a cap plate coupled at an upper end of the cylindrical can and being electrically connected to the negative electrode multi-tab; and a positive electrode terminal protruding upwardly through the cap plate and being electrically connected to the positive electrode multi-tab.

A cylindrical secondary battery includes: an electrode assembly including a positive electrode plate having a positive electrode multi-tab, a separator, and a negative electrode plate having a negative electrode multi-tab, the positive electrode plate, the separator, and the negative electrode plate being laminated and wound; a cylindrical can accommodating the electrode assembly; a cap plate coupled at an upper end of the cylindrical can and being electrically connected to the negative electrode multi-tab; and a positive electrode terminal protruding upwardly through the cap plate and being electrically connected to the positive electrode multi-tab.

A sealed battery includes a battery can with a bottomed cylindrical shape having an opening, an electrode body accommodated in the battery can, and a sealing plate closing the opening of the battery can. The sealing plate has a first main surface facing an outside of the battery can and a second main surface opposite to the first main surface. The first main surface has a first groove therein with an arc shape. The second main surface has a second groove therein with an arc shape disposed to correspond to the first groove. The first groove has a central angle A1 smaller than a central angle A2 of the second groove. The first groove intersects a symmetry axis of the second groove on the second groove when viewed in a normal direction of the first main surface.

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.

A technical object to be solved according to the present disclosure is to provide a secondary battery which has reduced electrical resistance by directly connecting an electrode assembly to a can and/or a terminal without lead tabs and also has an increased battery capacity by removing lead tabs. To this end, the present disclosure provides a secondary battery comprising: a can; an electrode assembly accommodated in the can and including a first uncoated portion extending in a first direction and a second uncoated portion extending in a second direction opposite to the first direction; a first current collector plate electrically connected to the first uncoated portion of the electrode assembly; a first terminal portion coupled to the can and electrically connected to the first current collector plate; and a second terminal portion coupled to the can and electrically connected to the second uncoated portion of the electrode assembly.

A technical object to be solved according to the present disclosure is to provide a secondary battery which has reduced electrical resistance by directly connecting an electrode assembly to a can and/or a terminal without lead tabs and also has an increased battery capacity by removing lead tabs. To this end, the present disclosure provides a secondary battery comprising: a can; an electrode assembly accommodated in the can and including a first uncoated portion extending in a first direction and a second uncoated portion extending in a second direction opposite to the first direction; a first current collector plate electrically connected to the first uncoated portion of the electrode assembly; a first terminal portion coupled to the can and electrically connected to the first current collector plate; and a second terminal portion coupled to the can and electrically connected to the second uncoated portion of the electrode assembly.