公开(公告)号：US20230352745A1

公开(公告)日：2023-11-02

申请号：US18350939

申请日：2023-07-12

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Yasuaki MURASHI ,  Yoshihiro NIIDA ,  Yuki WATANABE ,  Yusuke NAMIKI ,  Masataka SHIKOTA

IPC: H01M10/0587 ,  H01M50/411 ,  H01M50/44 ,  H01M50/489 ,  H01M50/204 ,  H01M4/134 ,  H01M4/485

CPC classification number: H01M10/0587 ,  H01M50/411 ,  H01M50/44 ,  H01M50/489 ,  H01M50/204 ,  H01M4/134 ,  H01M4/485

Abstract: According to one embodiment, provided is an electrode group having a flat structure including a flat portion, that includes a wound body and a fixing tape wound around the wound body. The wound body is configured of a stack wound 50 turns or more with a center thereof positioned along a first direction, where the stack includes a positive electrode, a negative electrode, and a separator. In a second direction intersecting a principal surface in the flat portion, a swollen-state thickness TS when impregnated with propylene carbonate and a dry thickness TD satisfy 1.01