NOVELTY - Non-aqueous electrolyte secondary cell comprises a wound electrode assembly. The wound electrode assembly is formed by winding a positive electrode plate, a negative electrode plate and a separator separating the positive and negative electrode plates. The positive electrode plate has a positive electrode core exposed portion, which is formed by exposing at least one side edge of a belt-shaped positive electrode core along the longitudinal direction of the positive electrode core, and a positive electrode active material layer formed on the positive electrode core.    USE - The non-aqueous electrolyte secondary cell is useful in battery-powered vehicles, such as electric vehicles and hybrid electric vehicles.    ADVANTAGE - The non-aqueous electrolyte secondary cell is safe, and has high capacity, high energy density, high power output and excellent insulation reliability between the positive and negative electrode plates.    DETAILED DESCRIPTION - Non-aqueous electrolyte secondary cell comprises a wound electrode assembly. The wound electrode assembly is formed by winding a positive electrode plate, a negative electrode plate and a separator separating the positive and negative electrode plates. The positive electrode plate has a positive electrode core exposed portion, which is formed by exposing at least one side edge of a belt-shaped positive electrode core along the longitudinal direction of the positive electrode core, and a positive electrode active material layer formed on the positive electrode core. The negative electrode plate has a negative electrode core exposed portion, which is formed by exposing at least one side edge of a belt-shaped negative electrode core exposed along the longitudinal direction of the negative electrode core, and a negative electrode active material layer formed on the negative electrode core. The filling density of the positive electrode active material layer is 2-2.8 g/cc. The filling density of the negative electrode active material layer is 1-1.5 g/cc. The thickness of the positive and negative electrode plate is 100-200 mu m. The thickness of the separator is 10-30% of each thickness of the positive and negative electrode plates. The air permeability per unit thickness of the separator is 7-27 second/100 cc. mu m.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective view of a non-aqueous electrolyte secondary cell.    Prismatic outer surface (1)    Sealing body (2)    Positive and negative electrode external terminals.. (5)