Lg Chem, Ltd

Lg Energy Solution, Ltd.

Jong-Pil Park

Jong-Hun Kim

Jung-Hoon Yang

Geun-Chang Chung

Young-Suk Cho

Yo-Han Ko

A battery cell has an electrode assembly, including a positive electrode and a negative electrode stacked in the state in which a separator is interposed between the positive electrode and the negative electrode, is mounted in a pouch-shaped cell case, wherein electrode tabs protruding outwards from a plurality of electrode plates are coupled to a first lead end of an electrode lead, a second lead end of the electrode lead, which is an opposite end to the first lead end, is located on the outer surface of the cell case in the state of being parallel to the direction in which the electrode plates are stacked, and a lead body provided between the first lead end and the second lead end is located to face the outermost surface of the electrode assembly in the state of being maintained parallel to the direction in which the electrode plates are stacked.

Battery cell including electrode lead located so as to face outer surface of electrode assembly

The present invention relates to a separator for a secondary battery which is capable of improving a shut-down function of a cellulose-based multilayer separator physically having high strength. The separator for a secondary battery comprises a substrate formed of cellulose-based nanofibers and polyethylene nanoparticles; and a resin layer stacked on one surface or both surfaces of the substrate, the resin being formed from a polyolefin.

Cellulose-based multilayer separator

A pouch type secondary battery includes an electrode assembly and a pouch sheath material including a first pouch portion and a second pouch portion. The pouch-type secondary battery includes dual electrode leads wherein a first electrode lead is attached to the first pouch portion and a second electrode lead is attached to the second pouch portion. In the pouch-type secondary battery, electric current is interrupted by using a volumetric swelling phenomenon caused by swelling or pressure generated upon overcharge so that the battery may be prevented from being further charged. In addition, when pressure is increased by an additional reaction, venting occurs toward the inner lead portion of each of the dual electrode leads. As a result, it is possible to increase the stability of a battery cell, module and a pack received in the pouch, and thus to improve the life of a battery.

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Daejeon, South Korea

Jong-Pil Park