Lg Chem, Ltd

Lg Energy Solution, Ltd.

Da Na Kim

Sang Uck Kim

Myung An Lee

Cheon Hee Bok

Yong Han Kim

Geun Young Park

Sang Gu Ji

Disclosed herein is a cap assembly disposed on an open upper end part of a cylindrical can of a battery, the battery being configured to have an electrode assembly mounted in the cylindrical can, the cap assembly including a safety vent configured to rupture in order to exhaust gas when the interior pressure of the battery reaches a predetermined pressure limit, an upwardly-protruding cap plate disposed on the upper part of the safety vent, the cap plate having a through-opening configured to receive the gas exhausted therethrough, a current interrupt member attached to the lower end of the safety vent, the current interrupt member configured to interrupt electric current when the interior pressure of the battery reaches the predetermined pressure limit, and a guide member attached to the inside of the cap plate, the guide member being configured to prevent escape of a ruptured portion of the safety vent.

Cap assembly comprising guide member for preventing escape of safety vent

A secondary battery is disclosed. According to the present invention, in a case in which the secondary battery is ignited, a gas and materials within the secondary battery may be smoothly discharged to improve safety when the secondary battery is ignited. In order to achieve the above-described object, according to an aspect of the present invention, a secondary battery includes: an electrode assembly; a battery can accommodating the electrode assembly; and a coating part applied to the battery can, wherein the battery can includes a slim part having a relatively thinner thickness than that of the other region of the battery can, and the coating part is applied to the slim part and made of a metal material having tensile strength less than that of the slim part.

Secondary battery

Growing community of inventors

Daejeon, South Korea

Da Na Kim