US 2019/0165407 A1 · Cylindrical Lithium Secondary Battery

Abstract

A cylindrical lithium secondary battery according to the present invention can reduce gas explosion by preventing gas concentration from being concentrated only on the upper top cap vent by increasing the gas spouting passage through which the inner gas of the can is spouted by forming a rupture portion of a material different from that of the can member on a part of the cylindrical can member, and when the inside or outside of the battery is exposed to a high temperature, by making, a shape-based alloy member, which causes cracking of the can member by deformation, included a part of the can member, the gas is discharged through the can vent by the cracking of the can member to prevent explosion before the tap cap safety vent operates by the internal air pressure, and ignition that may be caused by heating by internal or external heat may be prevented.

Claims11

Dependent claims

A cylinder type lithium secondary battery, comprising:

a cylinder type can member having an open upper end, an inner portion, and a shape memory alloy member included as a part of the cylinder type can member;
an electrode assembly embedded with an electrolyte in the inner portion of the cylinder type can member;
and
a cap assembly mounted on the open upper end of the cylinder type can member, the cap assembly comprising a safety vent configured to discharge gas when an internal pressure of the cylinder type can member rises due to the gas,
wherein the shape memory alloy member is configured to deform and crack the cylinder type can member when a temperature of the shape memory alloy member reaches a predetermined temperature.

2 more elements

Dependencies are inferred from the claim text.

Cylindrical Lithium Secondary Battery

Life of this patent

Cylindrical Lithium Secondary Battery

Life of this patent

Abstract

Claims11