Abstract: Described is a cylindrical secondary battery in which an inner surface of a can is coated to insulate an electrode assembly and a can from each other and to improve heat resistance of the can. The cylindrical secondary battery may include an electrode assembly, a can in which the electrode assembly is accommodated and of which one end is opened so as to be electrically connected to the electrode assembly, a cap plate electrically connected to the electrode assembly, and a rivet terminal insulated from the can and the cap plate, which may be configured to seal one end of the can and which may be insulated from the can. A first coating layer may be provided on at least a portion of an inner surface of the can.

Abstract: A secondary battery includes a case having a cylindrical shape, an electrode assembly accommodated in the case and including first tabs protruding in a first direction and second tabs protruding in the first direction, a first current collector plate accommodated in the case and connected to the first tabs, a second current collector plate configured to connect the second tabs to the case, a rivet terminal connected to the first current collector plate and passing through the case, and an insulating member in contact with a perimeter of each of the electrode assembly, the first current collector plate, and the second current collector plate.

Abstract: The present disclosure provides a secondary battery including a case having a cylindrical shape, an electrode assembly in the case, and including a first tab protruding in a first direction at a center portion, and a second tab protruding in the first direction at a perimeter, a first current collector plate in the case and electrically connected to the first tab, a second current collector plate electrically connecting the second tab to the case, and a rivet terminal electrically connected to the first current collector plate, and passing through the case.

Abstract: A cylindrical secondary battery includes an electrode assembly; a cylindrical can accommodating the electrode assembly; and a terminal portion including a rivet terminal coupled to one side in the longitudinal direction of the can and electrically connected to the electrode assembly and at least one insulator between the can and the rivet terminal to insulate the can and the rivet terminal from each other. The battery also includes a rotation preventing portion on the can and/or the terminal portion. Since a structure for preventing rotation of the rivet terminal is provided on the upper surface of the can or the rivet head or the main body to which the rivet terminal is fastened, the rivet terminal may not rotate due to an external force or vibration. Therefore, the stability and reliability of the secondary battery can be improved.

Abstract: A cylindrical secondary battery includes: an electrode assembly; a cylindrical can accommodating the electrode assembly and having a terminal hole at a first end; and a terminal portion coupled to the first end of the can and electrically connected to the electrode assembly, and the can further includes a coupling groove and a coupling protrusion adjacent to the terminal hole on a portion through which the terminal hole passes. In the cylindrical secondary battery according to embodiments of the present disclosure, a sealing force of the cylindrical secondary battery may be increased by providing a groove and a protrusion in the can that is a region to which a rivet terminal is coupled.

Abstract: A secondary battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator interposed therebetween, a can accommodating the electrode assembly, and a terminal portion including a rivet terminal coupled to one side of the can in a longitudinal direction and electrically connected to the first electrode plate, and an insulator between the can and the rivet terminal to insulate the can from the rivet terminal, and having a stepped structure in an area contacting the rivet terminal. By reducing or minimizing a height difference between the positive electrode terminal and the insulator, shape deformation of the electrode assembly can be reduced or prevented during the manufacturing process. By reducing the thickness and weight of the insulator, the size of the electrode assembly can be increased, and the capacity of the secondary battery can be increased.

Abstract: A secondary battery includes: an electrode assembly; a can having a lower surface and a side surface and accommodating the electrode assembly therein; a cap plate coupled to an upper end of the can; a terminal on the lower surface of the can; and an insulator having a plate-shaped portion between the electrode assembly and the lower surface of the can and a wing portion extending upwardly from a circumference of the plate-shaped portion. The wing portion has a cutout portion.

Abstract: A cylindrical secondary battery including: an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case accommodating the electrode assembly and having an open lower end, the case being electrically connected to the second electrode plate; a first current collector plate between an upper surface of the electrode assembly and the case and being electrically connected to the first electrode plate; a terminal extending through an upper surface of the case and having a lower end electrically and mechanically coupled to an upper surface of the first current collector plate, the terminal having: a welding groove having a depth downward from an upper surface thereof; and a sealing member filling the welding groove; and a cap plate sealing the lower end of the case.

Abstract: A cylindrical secondary battery includes: an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a cylindrical case accommodating the electrode assembly and electrically connected to the second electrode plate; a terminal coupled to a lower surface of the case through a first gasket and electrically connected to the first electrode plate; a cap plate sealing the upper end of the case; and a second gasket between the case and the cap plate, the second gasket having: a sidewall portion in close contact with a side surface of the case; and a bottom portion extending inwardly from a bottom end of the sidewall portion and having at least one opening formed therein. The bottom portion of the second gasket having flange parts extending from the sidewall portion in an edge region and a bridge part connecting the flange parts to each other.

Abstract: A cylindrical secondary battery includes a can and a terminal part including: a first terminal outside of the can; and a second terminal coupled to a terminal hole of the can, arranged inside and outside of the can, and riveted to the first terminal from an outside of the can. According to embodiments of the present disclosure, plastic deformation of a rivet terminal occurs outside of a can, and there is no limitation on the shape of the rivet terminal inside the can. In addition, the rivet terminal may be processed regardless of a size or height of the can, and there is no interference with the can, and a processing time may be reduced.