公开(公告)号：US10367181B2

公开(公告)日：2019-07-30

申请号：US15265262

申请日：2016-09-14

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoshinori Shishida ,  Kenji Date ,  Takao Kuromiya

IPC: H01M4/133 ,  H01M2/16 ,  H01M10/0525 ,  H01M4/131

Abstract: A separator includes a separation functional layer and a support layer. The separation functional layer is configured as a denser layer with a smaller pore size and a lower porosity than the support layer. Accordingly, movement of metal foreign objects from the positive electrode plate side to the negative electrode plate side, and precipitation of metal foreign objects on the negative electrode plate side can be inhibited, thereby making it possible to ensure battery performance and safety.