An apparatus for producing a cylindrical secondary battery cell including a battery can in which an electrode assembly and an electrolytic solution are accommodated, a cap plate coupled to the battery can, and a gasket located between the battery can and the cap plate includes: a support member into which the cylindrical secondary battery cell is inserted in a state where an end portion of the battery can and an end portion of the gasket are arranged to face a preset direction and the cap plate contacts the gasket; at least one fixing member configured to fix the cylindrical secondary battery cell moved to a preset position by the support member; and a forming member located over the cylindrical secondary battery cell fixed by the fixing member and rotating and pressing the end portion of the battery can to form a crimping portion.

An apparatus for producing a cylindrical secondary battery cell including a battery can in which an electrode assembly and an electrolytic solution are accommodated, a cap plate coupled to the battery can, and a gasket located between the battery can and the cap plate includes: a support member into which the cylindrical secondary battery cell is inserted in a state where an end portion of the battery can and an end portion of the gasket are arranged to face a preset direction and the cap plate contacts the gasket; at least one fixing member configured to fix the cylindrical secondary battery cell moved to a preset position by the support member; and a forming member located over the cylindrical secondary battery cell fixed by the fixing member and rotating and pressing the end portion of the battery can to form a crimping portion.

A gasket for a secondary battery includes a base resin and a rust inhibitor, wherein the base resin includes polybutylene terephthalate and the rust inhibitor includes an anti-rust material and a polymer resin, and the base resin and the polymer resin are different.

The present invention relates to a secondary battery capable of improving the coupling force between a safety vent and a cap-up. For example, disclosed is a secondary battery comprising: an electrode assembly; a case for accommodating the electrode assembly; a cap assembly coupled to the upper part of the case; and a gasket interposed between the cap assembly and the case, wherein the cap assembly includes a cap-up and a safety vent, which is provided at the lower part of the cap-up and has a vent extension part extending to the upper part of the cap-up so as to encompass the edge of the cap-up, a welding region, in which the safety vent and the cap-up are welded and coupled by laser welding, is formed in the vent extension part, and the welding region is formed in a line shape.

The present invention relates to a secondary battery capable of improving the coupling force between a safety vent and a cap-up. For example, disclosed is a secondary battery comprising: an electrode assembly; a case for accommodating the electrode assembly; a cap assembly coupled to the upper part of the case; and a gasket interposed between the cap assembly and the case, wherein the cap assembly includes a cap-up and a safety vent, which is provided at the lower part of the cap-up and has a vent extension part extending to the upper part of the cap-up so as to encompass the edge of the cap-up, a welding region, in which the safety vent and the cap-up are welded and coupled by laser welding, is formed in the vent extension part, and the welding region is formed in a line shape.

A secondary battery according to one embodiment of the present disclosure includes an electrode assembly impregnated with an electrolyte solution; a battery case that houses the electrode assembly and the electrolyte solution; a cap assembly coupled to the battery case; and a gasket positioned between the battery case and the cap assembly, wherein the gasket includes an indented part formed on the inside, and wherein the indented part is spaced apart from the cap assembly while facing the cap assembly.

A hermetically sealed battery includes: a battery can having a cylindrical shape with a bottom and an opening; an electrode body accommodated in the battery can; and a sealing plate sealing 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 thereto. The sealing plate includes an outer peripheral portion having a flat plate shape, an inner peripheral portion having a flat plate shape, an inclined portion provided between the outer and inner peripheral portions. The inclined portion is inclined such that the inner peripheral portion is positioned on an outer side of the battery can than the outer peripheral portion. The inclined portion includes a thin portion and a thicker base portion. The thin portion and the base portion are arranged in a radial direction of the sealing plate.

A cylindrical battery according to an embodiment of the present disclosure has a sealing plate includes a flange portion which is secured by crimping to the opening portion of the outer can, a terminal portion formed on the radially inner side of the flange portion, and a thin-walled portion which is formed on the radially outer side of the sealing plate, and which connects the flange portion and the terminal portion; and the thin-walled portion is formed in such a way as to be inclined upward toward the outside from the radially inner side of the sealing plate, and is formed in such a way as to connect a part below the central portion of an outer circumferential surface of the terminal portion to a part above the central portion of an inner circumferential surface of the flange portion.

A cylindrical battery according to an embodiment of the present disclosure has a sealing plate includes a flange portion which is secured by crimping to the opening portion of the outer can, a terminal portion formed on the radially inner side of the flange portion, and a thin-walled portion which is formed on the radially outer side of the sealing plate, and which connects the flange portion and the terminal portion; and the thin-walled portion is formed in such a way as to be inclined upward toward the outside from the radially inner side of the sealing plate, and is formed in such a way as to connect a part below the central portion of an outer circumferential surface of the terminal portion to a part above the central portion of an inner circumferential surface of the flange portion.

A cylindrical battery including a battery case and a lid, the battery case having an opening doubly wound and tightened to be sealed by an outer peripheral portion of the lid, wherein an opening-side outer peripheral portion of the battery case has a diameter reduced inward in the radial direction, an outer peripheral surface of the battery case is covered with a label, a space surrounded by the outer peripheral surface of the battery case, the outer peripheral portion of the lid, and the label is provided, and 1.2×T1≤D≤2.7×T1 is satisfied in a range of 0.1 mm≤T1≤0.5 mm, where D is a diameter of an inscribed circle that is tangent to the outer peripheral surface of the battery case, the outer peripheral portion of the lid, and the label, and T1 is a thickness of the battery case.