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 |
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.
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