NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR MANUFACTURING NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

The purpose of the present disclosure is to provide a non-aqueous electrolyte secondary battery capable of suppressing an internal short circuit of a battery due to an external impact in both a fully charged state and a non-fully charged state. The non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure is characterized by: comprising a wound electrode body in which a positive electrode and a negative electrode are wound thereon via a separator, and a battery case that houses the electrode body; the positive electrode having a positive electrode current collector and a positive electrode mixture layer formed on at least one surface of the positive electrode current collector; and the separator having a normal part and a plastically deformed part having a higher puncture strength than the normal part.