NOVELTY - The non-aqueous electrolyte secondary battery comprises a battery assembly having a negative electrode, a positive electrode and a separator, and a non-aqueous electrolyte. The non-aqueous electrolyte includes lithium bis(oxalato)borate. The negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core. The packing density of the negative electrode active material layer is 1.1-1.38 g/ml. The battery capacity of the non-aqueous electrolyte secondary battery is greater than or equal to 21 Ah.    USE - The non-aqueous electrolyte secondary battery such as lithium ion secondary battery is useful for electric vehicles and hybrid electric vehicles.    ADVANTAGE - The non-aqueous electrolyte secondary battery exhibits improved productivity, battery characteristics such as output characteristics and cycle characteristics and capacity.    DETAILED DESCRIPTION - The non-aqueous electrolyte secondary battery comprises a battery assembly having a negative electrode, a positive electrode and a separator, and a non-aqueous electrolyte. The non-aqueous electrolyte includes lithium bis(oxalato)borate. The negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core. The packing density of the negative electrode active material layer is 1.1-1.38 g/ml. The battery capacity of the non-aqueous electrolyte secondary battery is greater than or equal to 21 Ah. The concentration of lithium bis(oxalato)borate is 0.06-0.18 mol/l. The negative electrode active material included in the negative electrode active material layer is a carbon material. The surface of graphite particles being coated by a coating layer includes amorphous carbon particles and an amorphous carbon layer. An electrode assembly is a wound electrode assembly. The positive electrode, the negative electrode and the separator are wound together.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of a non-aqueous electrolyte secondary battery.    Outer can (1)    Sealing component (2)    Positive and negative electrode terminals. (5, 6)