Lg Energy Solution, Ltd.

Lg Chem, Ltd

Jun Tak Kim

Je Jun Lee

Do Gyun Kim

Sang Suk Jung

Sang Sok Jung

Hang Soo Shin

Byoung Gu Lee

Byoung Kook Lee

Gil Young Lee

Jinseo Park

Kwang Su Hwang Bo

Seong Mo Koo

Kwang Cheol Park

An ultrasonic welding apparatus includes a housing; a horn part coupled to the housing and configured to transmit an ultrasonic wave in one direction; a tip part coupled to the horn part and configured to apply the ultrasonic wave transmitted from the horn part to an object to be welded, and to apply the ultrasonic wave at an angle of 80° or greater and 100° or less with respect to a direction in which the horn part transmits the ultrasonic wave; an anvil part configured to support the object to be welded; and a suction connected to the anvil part and configured to suck a foreign matter generated resulting from ultrasonic welding, in which the tip part is configured to be driven by linear vibration with respect to the object to be welded, and achieves the effects of easily removing foreign matter and improving welding quality.

Ultrasonic welding device

A method of manufacturing a cylindrical battery case includes performing an ironing process, which is one of the processes of manufacturing the battery case, a plurality of times in order to decrease the surface roughness of the battery case, thereby improving the corrosion characteristics of the battery case. The surface roughness of the cylindrical battery case is decreased by performing a thickness reducing process when a process for forming the outer circumferential surface of a body of the cylindrical battery case is performed at the time of manufacturing the cylindrical battery case. In addition, corrosion characteristics are improved for respective values of the surface roughness.

Method of manufacturing cylindrical battery case having reduced surface roughness

The present invention relates to a cap assembly for a secondary battery mounted on an opening of a can. The cap assembly comprises: a top cap; a safety element disposed on a lower portion of the top cap; a safety vent disposed on a lower portion of the safety element; and a gasket surrounding edges of the top cap, the safety element, and the safety vent and mounted on the opening of the can, wherein an impact absorption part absorbing an impact from the gasket is disposed between an inner wall of the gasket and an outer circumferential surface of the safety vent.

Cap assembly for secondary battery

Growing community of inventors

Daejeon, South Korea

Jun Tak Kim