Nonaqueous electrolyte secondary battery

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.