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 having a first electrode plate, a separator, and a second electrode plate; a case accommodating the electrode assembly is and the lower end of the case is open; terminals penetrating the upper surface of the case; a first current collector plate between the upper surface of the electrode assembly and the case and electrically connecting the first electrode plate and the terminals; and a cap plate sealing the lower end of the case. In the first current collector plate, the surface roughness of the lower surface of the first current collector plate is greater than that of the upper surface.

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 secondary battery includes: an electrode assembly having a first electrode plate having a first electrode substrate tab arranged in one direction, a second electrode plate having a second electrode substrate tab arranged in an opposite direction to the first electrode substrate tab, and a separator interposed between the first electrode plate and the second electrode plate, and wound into a cylindrical shape; a cylindrical can configured accommodating the electrode assembly; a first electrode current collector plate electrically connected to the first electrode substrate tab; and a second electrode current collector plate electrically connected to the second electrode substrate tab, wherein the first electrode substrate tab contacts the first electrode current collector plate, and the separator extends and contacts the first electrode current collector plate with the first electrode substrate tab interposed therebetween.

Abstract: A secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case accommodating the electrode assembly; a terminal penetrating an upper side portion of the case and coupled to the case with a first gasket; a first current collector plate between an upper side portion of the electrode assembly and the case and electrically connecting the first electrode plate and the terminal; and a cap plate sealing an open lower end of the case. The first current collector plate includes an electrode plate connection part connected to the first electrode plate, and a terminal connection part coupled to a terminal hole of the case and including a fastening part coupled to the upper side of the terminal connection part. An insulating member is attached to the first current collector plate and avoids a current collection welding area.

Abstract: Disclosed is a cylindrical secondary battery including an electrode assembly, a cylindrical can having a circular upper surface portion and a side portion extending from the upper surface portion, the side portion having a beading portion formed adjacent to an end thereof so as to be inwardly recessed and a crimping portion formed by bending an end of the side portion, the can receiving the electrode assembly, and a cap plate coupled to an open end of the can, the cap plate having a notch formed therein, wherein the rupture pressure of the notch is lower than the uncrimping pressure of the crimping portion. The cylindrical secondary battery may be efficiently designed by designing and controlling factors that affect the rupture pressure and uncrimping, and safety of the cylindrical secondary battery can be improved by performing control such that uncrimping does not occur before rupture of the notch.

Abstract: A cylindrical secondary battery includes: a cylindrically wound electrode assembly including a plurality of positive electrode plates, a plurality of negative electrode plates, and a plurality of separators insulating the positive electrode plates and the negative electrode plates from each other; a can accommodating the electrode assembly; and a cap plate coupled to an open end of the can and sealing the can.

Abstract: A secondary battery manufacturing device according to an embodiment of the present disclosure may include an unwinder configured to supply a wound electrode plate foil and a plurality of slitters configured to cut the electrode plate foil supplied from the unwinder at predetermined intervals to form a plurality of electrode plate foils. The device may further include a plurality of rewinders configured to wind the electrode plate foils discharged from the slitters in one direction, and a first winding device and a second winding device configured to wind the electrode plate foils discharged from the separators and separators and discharge the wound electrode assemblies that include the electrode plate foils and separators. With the device, a process of unwinding and rewinding a previously wound winding material to adjust a direction of an uncoated portion or electrode plate surface is not necessary, and the manufacturing time for a secondary battery may be reduced.

Abstract: A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case accommodating the electrode assembly; a positive electrode current collector in the case and electrically connected to the first electrode plate; a rivet terminal having one side connected to the positive electrode current collector and another side extending to an outside of the case; an inner insulating part between the positive electrode current collector and the case to block an electrical connection between the positive electrode current collector and the case; and a distance-maintaining member between the inner insulating part and the positive electrode current collector to maintain a distance between the inner insulating part and the positive electrode current collector.

Abstract: Disclosed is a secondary battery capable of blocking supply of current when pressure in the secondary battery increases. The secondary battery includes a cylindrical can accommodating an electrode assembly, an integrated current collector located in the cylindrical can and electrically connected to the electrode assembly, a rivet unit disposed in contact with the integrated current collector to receive current and extending to the outside of the cylindrical can, and a terminal cover located outside the cylindrical can and configured to receive current through the rivet unit.

Abstract: Disclosed is a cylindrical secondary battery capable of preventing a cap plate from rupturing before a notch ruptures by dispersing processing stress applied to the cap plate, thereby improving safety thereof. The cylindrical secondary battery may include an electrode assembly including a first electrode plate and a second electrode plate, a cylindrical can accommodating the electrode assembly and including an open end, and a cap plate coupled to the open end of the can and including a notch formed therein. The cap plate may further include an auxiliary groove formed therein so as to be spaced apart from the notch.

Abstract: A secondary battery configured to block a supply of current in response to a pressure within the secondary battery increasing. A secondary battery includes a cylindrical can accommodating an electrode assembly, a positive electrode current collector plate electrically connected to the electrode assembly and inside the cylindrical can, an inner terminal electrically connected to the positive electrode current collector plate and having a connection hole, a variable connection part fixed to the cylindrical can in contact with the inner terminal and spaced apart from the inner terminal to block a flow of current in response to an internal pressure of the cylindrical can increasing, a terminal cover electrically connected to the variable connection part and outside the cylindrical can, and a spacer between the variable connection part and the terminal cover and configured to define an inner space for movement of the variable connection part.

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 an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case accommodating the electrode assembly and having a lower end that is open and electrically coupled to the second electrode plate; a first current collector plate between a top surface of the electrode assembly and the case and that is electrically connected to the first electrode plate; a terminal passing through a top surface of the case and including a lower end electrically and mechanically coupled to a top surface of the first current collector plate; and a cap plate configured to seal the lower end of the case. The terminal includes a lower terminal including a welding groove having a depth from a top surface of the terminal in a downward direction; and an upper terminal in the welding groove of the lower terminal.

Abstract: A cylindrical secondary battery including an electrode assembly including a negative electrode plate and a positive electrode plate; a cylindrical can accommodating the electrode assembly and including a terminal hole in one side of the cylindrical can and an open inlet in another side of the cylindrical can; a terminal coupled to the cylindrical can through the terminal hole; and a negative electrode current collector in the cylindrical can and electrically connecting the cylindrical can to the negative electrode plate. The negative electrode current collector includes a notch groove or a cutting hole configured to be cut in response to an increase in pressure in the cylindrical can.

Abstract: A cylindrical secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case accommodating the electrode assembly and electrically connected to the second electrode plate; a terminal electrically connected to the first electrode plate and coupled to the case via a first gasket; a cap plate configured to seal an upper end portion of the case, a second gasket between the case and the cap plate; a first current collector between a lower surface of the electrode assembly and the terminal; and a second current collector between an upper surface of the electrode assembly and the cap plate and at one side of an edge region thereof between the case and the second gasket. An electrically conductive connection induction portion is on at least one of the cap plate or the second current collector.

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: 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 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: 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.