Separator having fine pattern, wound body, and non-aqueous electrolyte battery

A separator for use in a nonaqueous electrolyte battery, wherein

• the separator comprises a laminate structure of a substrate comprising a plurality of layers including a polyolefin microporous membrane layer, and a convex-shaped patterns porous layer having a plurality of convex-shaped patterns, each convex-shaped pattern of the plurality of convex-shaped patterns being independently laminated on at least one main surface of the substrate,
• the value of T1/T2 represented using the distance (T1) between a substantially flat surface formed at the top of the convex-shaped patterns and a substantially flat surface formed at the bottom of the convex-shaped patterns and the total thickness (T2) of the separator is 0.45 or more and less than 1,
• the compressive modulus of the convex-shaped patterns layer is within the range of 1.1×103 MPa to 1.3×103 MPa, and the compressive modulus of the layer having the lowest compressive modulus in the layers constituting the substrate is within the range of 86 MPa to 102 MPa,
• the compressive modulus of the convex-shaped patterns porous layer is higher than the compressive modulus of all of the plurality of layers constituting the substrate,
• the convex-shaped patterns porous layer having the convex-shaped patterns contains inorganic particles or resin fine particles, and a content of the inorganic particles or resin fine particles is 80 weight % or more and 99.99 weight % or less, per 100 weight % of the convex-shaped patterns porous layer,
• S1/S2 represented using a ratio of the air permeability S1 of a portion having the convex-shaped patterns, measured in the vertical direction of the convex-shaped patterns, to the air permeability S2 of a non-pattern part of the separator is 0.8 or more and 5 or less, and
• the air permeability S1 is 255 seconds/100 ml or less.