Non-aqueous electrolyte secondary battery

摘要

A non-aqueous electrolyte secondary battery including: an electrode group in which a positive electrode plate and a negative electrode plate are spirally wound with a separator interposed therebetween; and a non-aqueous electrolyte, wherein the positive electrode plate has at least one exposed portion of the positive electrode current collector, the negative electrode plate has at least one exposed portion of the negative electrode current collector, and a metal that dissolves into the non-aqueous electrolyte when the battery voltage exceeds a predetermined level is provided on a surface of the exposed portion of positive electrode current collector facing the exposed portion of negative electrode current collector. This battery is extremely safe because it prevents overcharge and internal short-circuit at an area where the positive and negative electrode active materials and the non-aqueous electrolyte exist together.