公开(公告)号：US20250118804A1

公开(公告)日：2025-04-10

申请号：US18836339

申请日：2022-12-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： HIROKI KOTAKE ,  JUN KUMAGAI

IPC: H01M10/0567 ,  H01M10/0587 ,  H01M50/107

Abstract: A secondary battery includes a battery case, an electrode group, and nonaqueous electrolyte. An outer diameter R ranges from 3.0 to 6.5 mm. A ratio r/R of an inner diameter r of a hollow in the electrode group to an outer-diameter R ranges from 0.1 to 0.3. The nonaqueous electrolyte includes at least one selected from LiSO3F and LiFSI. In the case that the nonaqueous electrolyte includes LiSO3F, the concentration of LiSO3F is 1.5% by mass or less in a case that the outer-diameter R ranges from 3.0 to 5 mm, and is 1.2% by mass or less I a case that the outer-diameter R is more than 5 mm and is 6.5 mm or less. In the case that the nonaqueous electrolyte includes LiFSI, the concentration of LiFSI is 1.1 mol/L or less in a case that the outer-diameter R ranges from 3.0 to 3.5 mm, and is 1.0 mol/L or less in a case that the outer-diameter R is more than 3.5 mm and is 6.5 mm or less.