Invention Grant
- Patent Title: Cylindrical nonaqueous electrolyte secondary battery
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Application No.: US16470351Application Date: 2017-12-11
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Publication No.: US11264649B2Publication Date: 2022-03-01
- Inventor: Junichi Sugaya , Atsushi Mizawa , Yuji Yamagami , Tomomichi Ueda , Masahiro Nakamura
- Applicant: SANYO Electric Co., Ltd.
- Applicant Address: JP Daito
- Assignee: SANYO Electric Co., Ltd.
- Current Assignee: SANYO Electric Co., Ltd.
- Current Assignee Address: JP Daito
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JPJP2016-249105 20161222
- International Application: PCT/JP2017/044291 WO 20171211
- International Announcement: WO2018/116876 WO 20180628
- Main IPC: H01M10/0587
- IPC: H01M10/0587 ; H01M10/0525 ; H01M10/04 ; H01M4/48 ; H01M4/13 ; H01M4/02

Abstract:
A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes: a wound electrode assembly (14) formed by spirally winding, via a separator (13), a positive electrode (11) and a negative electrode (12) in which a negative electrode mixture layer is formed on a negative electrode core, where: the negative electrode (12) includes a non-opposing portion (12a) that is wound 1.25 turns or more from an inner edge in a winding direction of the wound electrode assembly (14) without facing the positive electrode via the separator (13); the non-opposing portion (12a) includes a negative electrode mixture layer-formed portion (12c) in which the negative electrode mixture layer is formed on at least either side continuously in an inward winding direction from an outer edge in the winding direction; and the negative electrode mixture layer-formed portion (12c) is wound 0.75 turns or more.
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