Lg Chem, Ltd

Lg Energy Solution, Ltd.

Jae-Pil Lee

Sang-Hoon Choy

Jun-Kyu Park

Kyung-Min Lee

Shin-Wook Jeon

Jin-Young Park

Hyun-Woo Park

Young-Joon Shin

Kyoung-Rok Mun

Sung-Mo Kang

Hyung-Woo Choi

Do-Young Ahn

Jong-Goo Park

Jong-Woo Shin

The present disclosure describes an ultrasonic welding apparatus, which improves the welding strength of an electrode tab and an electrode lead included in a secondary battery, and a secondary battery with an enhanced electrode structure strength by using the ultrasonic welding apparatus. The secondary battery includes an electrode assembly in which a cathode plate provided with a cathode tab, an anode plate provided with an anode tab, and a separator are stacked in turn; a pouch for receiving the electrode assembly; a cathode lead electrically coupled to the cathode tab by welding; and an anode lead electrically coupled to the anode tab by welding, wherein the density of welding points, formed at a welding surface between the anode lead and the anode tab, is higher than that of welding points, formed at a welding surface between the cathode lead and the cathode tab.

Ultrasonic welding apparatus and secondary battery with enhanced electrode structure

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Daejeon, South Korea

Jae-Pil Lee