US 12,218,313 B2
Nonaqueous electrolyte secondary battery
Masashi Muraoka, Kakogawa (JP); and Kazuki Takeno, Takasago (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Apr. 25, 2022, as Appl. No. 17/727,813.
Claims priority of application No. 2021-073929 (JP), filed on Apr. 26, 2021.
Prior Publication US 2022/0344722 A1, Oct. 27, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0587 (2013.01) [H01M 10/0569 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0028 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A nonaqueous electrolyte secondary battery comprising:
an exterior package;
an electrode assembly; and
an electrolyte solution, wherein
the exterior package accommodates the electrode assembly and the electrolyte solution,
the electrode assembly includes a laminated assembly,
the laminated assembly includes a positive electrode plate, a separator, and a negative electrode plate,
the separator separates the positive electrode plate and the negative electrode plate from each other,
the laminated assembly is spirally wound,
in a cross section orthogonal to a winding axis of the laminated assembly, the electrode assembly has a contour line having a corner-rounded rectangular shape,
the contour line consists of a first arc-shaped portion, a straight line portion, and a second arc-shaped portion,
the straight line portion consists of two line segments,
the straight line portion connects the first arc-shaped portion and the second arc-shaped portion to each other,
the contour line has a height ratio of 1.20 to 1.35,
the height ratio is calculated by the following formula (α):
R1=H0/H1  (α), where
R1 represents the height ratio,
H0 represents a distance between two points most distant from each other on the contour line, and
H1 represents an average length of the two line segments,
the separator includes a first main surface and a second main surface,
the first main surface is in contact with the negative electrode plate, and
a first dynamic coefficient of friction between the first main surface and the negative electrode plate is 0.52 to 0.66.