公开(公告)号：US11108105B2

公开(公告)日：2021-08-31

申请号：US14995317

申请日：2016-01-14

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Minoru Takahashi ,  Daisuke Suzawa ,  Nozomi Uto

IPC: H01M10/00 ,  H01M50/10 ,  H01M50/116 ,  H01M10/0525 ,  H01M50/183

Abstract: In the case where a film having lower strength than a metal can is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery resistant to external force is provided. A cushioning material is provided in a region sandwiched by an exterior body of the secondary battery. Specifically, the cushioning material is provided on the periphery of an electrode group including a positive electrode current collector, a positive electrode active material layer formed on at least one surface of the positive electrode current collector, a separator, a negative electrode current collector, and a negative electrode active material layer formed on at least one surface of the negative electrode current collector.