US 12,148,957 B2
Nonaqueous electrolyte secondary battery
Kosuke Iwase, Konan (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jan. 30, 2024, as Appl. No. 18/426,591.
Application 18/426,591 is a continuation of application No. 18/189,248, filed on Mar. 24, 2023, granted, now 12,009,552.
Application 18/189,248 is a continuation of application No. 17/009,828, filed on Sep. 2, 2020, granted, now 11,646,475.
Claims priority of application No. 2019-175415 (JP), filed on Sep. 26, 2019.
Prior Publication US 2024/0178535 A1, May 30, 2024
Int. Cl. H01M 50/581 (2021.01); H01M 4/13 (2010.01); H01M 10/0525 (2010.01); H01M 10/0587 (2010.01); H01M 50/531 (2021.01)
CPC H01M 50/581 (2021.01) [H01M 4/13 (2013.01); H01M 10/0525 (2013.01); H01M 10/0587 (2013.01); H01M 50/531 (2021.01); H01M 2200/10 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of producing a nonaqueous electrolyte secondary battery comprising:
an electrode body in which a plurality of electrode sheets is laminated via a separator; and
a pair of electrode terminals electrically connected to the electrode body, the method comprising:
forming (i) an electrode mixture layer on a surface of a current collector foil of each of the electrode sheets, and (ii) a current collector foil exposed portion in which the current collector foil is exposed, the current collector foil exposed portion being formed in a corresponding one of side edge portions, in a width direction, of the each of the electrode sheets;
forming, in an electrode body, a core portion by laminating the electrode mixture layers of the electrode sheets in a central part of the electrode body in the width direction;
forming, in the electrode body, terminal connecting portions to which the electrode terminals are connected, respectively, the terminal connecting portions being formed in both side edge portions of the electrode body in the width direction such that respective current collector foil exposed portions are laminated;
forming, in the electrode body, a mixture layer non-facing portion in at least one of boundaries of the core portion with the terminal connecting portions, the mixture layer non-facing portion being configured such that the electrode mixture layer faces the current collector foil exposed portion; and
forming a short-circuit promoting portion constituted by a recessed portion having a depth of 30% or more of a thickness of the separator in the separator provided between the electrode sheets in the mixture layer non-facing portion.