公开(公告)号：US20190260089A1

公开(公告)日：2019-08-22

申请号：US16329460

申请日：2018-06-26

Applicant: LG CHEM, LTD.

Inventor： Jong-Hoon PARK ,  Joo-Hwan SUNG ,  Han-Gab SONG ,  Pil-Kyu PARK ,  Sung-Min PARK

IPC: H01M10/0587 ,  H01M10/052 ,  H01M4/525 ,  H01M2/26

Abstract: A lithium secondary battery is provided which includes a cylindrical jelly roll in which an electrode assembly having a stacked structure including a positive electrode is wound cylindrically, wherein a semi-cylindrical first winding core and second winding core are spaced apart from each other by a predetermined interval, the positive electrode includes a non-coated portion sheet having a positive electrode tab fused thereto and a coated portion sheet, and the non-coated portion sheet and the coated portion sheet are attached by a tape to provide the positive electrode, one end of the positive electrode is positioned at the core portion of the cylindrical jelly roll, and a portion of the positive electrode having the tape is positioned around a circumference of the winding core member such that it avoids a portion where the first winding core is spaced apart from the second winding core by the predetermined interval.

公开(公告)号：US20190265135A1

公开(公告)日：2019-08-29

申请号：US16342860

申请日：2018-06-27

Applicant: LG CHEM, LTD.

Inventor： An-Soo JEONG ,  Young-Tae KIM ,  Nam-Won KIM ,  Min-Gyu KIM ,  Pil-Kyu PARK ,  Han-Gab SONG

IPC: G01N3/04 ,  G01N3/08

Abstract: A jig assembly for measuring the tensile strength of an electrode at a bend having a similar radius to a core, an apparatus for measuring bending tensile strength including the jig assembly, and a method for measuring bending tensile strength that measures the tensile strength of an electrode at a bend having a similar radius to a core using the apparatus for measuring bending tensile strength are provided. The jig assembly of the present disclosure includes a fixing unit configured to fix a first end part of a sample, and a plate shaped bending jig configured to provide a one point bend to a lengthwise direction cross section of the sample and to guide a second end part of the sample toward a tensile testing load unit. According to the present disclosure, it is possible to measure the tensile strength of the electrode under a similar condition to a winding process before the electrode is used in real winding applications.