A cylindrical secondary battery includes: an electrode assembly including a positive electrode plate, a separator, and a negative electrode plate; a cylindrical can accommodating the electrode assembly and being electrically connected to the negative electrode plate, a lower end of the cylindrical can being open; a rivet terminal passing through an upper surface of the cylindrical can and electrically connected to the positive electrode plate; and a cap plate sealing the lower end of the cylindrical can, the cap plate having no electrical polarity.

The present invention relates to a button-type secondary battery including: an electrode assembly; a lower can provided with an accommodation part having an accommodation groove for accommodating the electrode assembly in a top surface thereof, a connection part extending outward from an upper end of the accommodation part, and a bent part extending from a front end of the connection part to a lower side of the accommodation part; an upper can provided with a cover part disposed on a top surface of the accommodation part to finish the accommodation groove and a bonding part formed along an edge surface of the cover part and bonded to the bent part; and a gasket provided between the lower can and the upper can, wherein a recessed lower insertion groove and a recessed upper insertion groove are formed in the bent part of the lower can and the bonding part of the upper can, which are in close contact with the gasket, respectively, and the lower insertion groove and the upper insertion groove are disposed to be spaced apart from each other so as not to face each other.

The present invention relates to a button-type secondary battery including: an electrode assembly; a lower can provided with an accommodation part having an accommodation groove for accommodating the electrode assembly in a top surface thereof, a connection part extending outward from an upper end of the accommodation part, and a bent part extending from a front end of the connection part to a lower side of the accommodation part; an upper can provided with a cover part disposed on a top surface of the accommodation part to finish the accommodation groove and a bonding part formed along an edge surface of the cover part and bonded to the bent part; and a gasket provided between the lower can and the upper can, wherein a recessed lower insertion groove and a recessed upper insertion groove are formed in the bent part of the lower can and the bonding part of the upper can, which are in close contact with the gasket, respectively, and the lower insertion groove and the upper insertion groove are disposed to be spaced apart from each other so as not to face each other.

A secondary battery includes: a cylindrical can; an electrode assembly accommodated in the cylindrical can with an electrolyte; and a cap assembly sealing the cylindrical can. The cap assembly includes a cap-up having a terminal portion, a bent portion downwardly bent from the terminal portion, and an extending portion outwardly extending from the bent portion. The terminal portion has a smaller thickness than the extending portion, and a top-end height of the terminal portion of the cap-up is equal to or less than that of the cylindrical can.

A secondary battery includes an electrode assembly, a case accommodating the electrode assembly, and a cap assembly coupled to a top portion of the case. The cap assembly includes a cap-up, a safety vent under the cap-up, a cap-down under the safety vent, an insulator between the safety vent and the cap-down, and a sub-plate on a bottom surface of the cap-down. Laser patterns formed by using a laser beam are on a bottom surface of the safety vent and a top surface of the cap-down.

A secondary battery includes: a cylindrical can including a first region, a second region, and a first bent portion extending between the first region and the second region on a circumferential surface of the can; an electrode assembly accommodated in the can; and a cap assembly at a top end of the can and sealing the can. The first bent portion is bent such that an angle between the first region and the second region is in a range of about 90° to about 100°; the first region of the can partially covers a top surface of the cap assembly facing an exterior side of the can, and the second region of the can surrounds side surfaces of the cap assembly.

Disclosed herein is a cylindrical battery including an electrode assembly (jelly roll) including a positive electrode, a separator, and a negative electrode, a cylindrical container including a receiving part for receiving the electrode assembly together with an electrolytic solution, a cap assembly mounted to an open upper end of the cylindrical container, a safety vent mounted in the cap assembly, and a pressurization part located between the safety vent and the receiving part, the pressurization part communicating with the receiving part, the pressurization part being configured to apply a predetermined pressure, which is generated by gas, to the receiving part, wherein the positive electrode includes a lithium composite transition metal oxide represented by Formula 1 in the specification as a positive electrode active material.

A secondary battery includes a cylindrical can; an electrode assembly accommodated in the cylindrical can with an electrolyte; a cap assembly sealing the cylindrical can, a top-end height of the cap assembly being equal to or less than a top-end height of the cylindrical can; and an insulation layer on a surface of the cap assembly that is exposed to the outside of the cylindrical can.

The purpose of the present disclosure is to provide a cylindrical battery in which a short circuit between an outer can and a sealing body can be suppressed. In a cylindrical battery (10) according to an embodiment of the present disclosure, a gasket (28) includes an extension part (29) extending from between a sealing body (17) and a tip (33a) on a radially inward side of a shoulder (33) of an outer can (16). The extension part (29) is arranged so that the gasket (28) intersects any straight lines connecting an upper surface (47) of the shoulder (33) opposite to the electrode body side in the axial direction and an upper surface (41) of an inner portion (40) opposite to the electrode body side in the axial direction, the inner portion (40) being located radially inward of the shoulder (33) in the sealing body (17).

A rechargeable battery including an electrode assembly including a positive electrode and a negative electrode, a case configured to encase the electrode assembly, a cap plate coupled to the case, a gasket between the case and cap plate and configured to insulate the case from the cap plate, and a heat-resistant member between an upper portion of the gasket and an outer surface of the cap plate and having a higher melting point than the gasket.