US 12,266,766 B2
Nonaqueous electrolyte secondary battery and battery module
Masahiro Yoshioka, Toyota (JP); and Yoshitomo Takebayashi, Nisshin (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 25, 2024, as Appl. No. 18/615,291.
Application 18/112,050 is a division of application No. 17/333,388, filed on May 28, 2021, granted, now 11,721,840, issued on Aug. 8, 2023.
Application 18/615,291 is a continuation of application No. 18/112,050, filed on Feb. 21, 2023, granted, now 12,015,125.
Claims priority of application No. 2020-114022 (JP), filed on Jul. 1, 2020.
Prior Publication US 2024/0274888 A1, Aug. 15, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/0587 (2010.01); G01R 31/382 (2019.01); H01M 4/38 (2006.01); H01M 4/583 (2010.01); H01M 10/44 (2006.01); H01M 4/02 (2006.01)
CPC H01M 10/0587 (2013.01) [G01R 31/382 (2019.01); H01M 4/382 (2013.01); H01M 4/583 (2013.01); H01M 10/44 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of preparing a nonaqueous electrolyte secondary battery comprising:
forming a positive electrode by coating a surface of a band-shaped positive-electrode current collecting foil with a positive-electrode composite material layer that contains a positive electrode active material,
forming a negative electrode by coating a surface of a band-shaped negative-electrode current collecting foil with a negative-electrode composite material layer that contains a negative electrode active material,
forming a nonaqueous electrolyte solution by dissolving a supporting electrolyte in a nonaqueous solvent,
forming an electrode body by overlaying the positive electrode, the negative electrode, and a separator on each other,
wherein the electrode body includes an electrolyte solution passage that is a flow passage through which the nonaqueous electrolyte solution flows between an inside and an outside of the electrode body, so that the nonaqueous electrolyte solution infiltrates into the electrode body, and
a region of the negative-electrode composite material layer that is in contact with the electrolyte solution passage is referred to as a damming portion, and a region of the negative-electrode composite material layer that is located on a center side relative to the damming portion is referred to as a liquid retaining portion,
wherein the damming portion contains a negative electrode active material of which an electrical potential relative to the positive electrode active material is high and a ratio of expansion or contraction due to an increase or decrease in SOC is high, when compared to a negative electrode active material contained in the liquid retaining portion.