公开(公告)号：US20250167307A1

公开(公告)日：2025-05-22

申请号：US18841780

申请日：2023-02-20

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira Kano ,  Takahiro Inoue

IPC: H01M10/0587 ,  H01M10/0525

Abstract: Disclosed is a non-aqueous electrolyte secondary battery including: a wound electrode group 10 in which a positive electrode 11 and a negative electrode 12 are spirally wound in a winding direction with a separator 13 interposed therebetween; and a non-aqueous electrolyte. The negative electrode 12 includes a reverse winding portion 12A at an end of the wound electrode group 10 at a starting side of winding, the reverse winding portion 12A being a portion that does not oppose the positive electrode 11 and is spirally wound in a direction opposite to the winding direction.

公开(公告)号：US20250038314A1

公开(公告)日：2025-01-30

申请号：US18841482

申请日：2023-02-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira Kano ,  Takahiro Inoue

IPC: H01M50/107 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/0587 ,  H01M50/446 ,  H01M50/451

Abstract: A cylindrical lithium secondary battery including a battery case of a bottomed cylindrical shape having an opening, a wound electrode group and a nonaqueous electrolyte which are housed in the battery case, and a sealing member sealing the opening. The wound electrode group includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. At the negative electrode, lithium metal deposits during charging and dissolves in the nonaqueous electrolyte during discharging. The nonaqueous electrolyte contains an electrolyte salt, and a solvent. The solvent contains an ether compound as a major component. The amount of the nonaqueous electrolyte per 1 mAh of discharge capacity of the lithium secondary battery is 2.5 μL or more and 6.5 μL or less.