Non-aqueous electrolyte secondary battery

Abstract

The purpose of the present disclosure is to provide a non-aqueous electrolyte secondary battery capable of enhancing insulation between a positive electrode and a negative electrode and suppressing thermal runaway of the battery due to external impact in a charged state. A non-aqueous electrolyte secondary battery, which is one embodiment of the present disclosure, comprises a wound electrode body in which a positive electrode and a negative electrode are wound with a first separator and a second separator being interposed therebetween, wherein the first separator is provided on the outer side of the wound positive electrode, the second separator is provided on the inner side of the wound positive electrode. This non-aqueous electrolyte secondary battery is characterized in that the piercing strength of the second separator is higher than that of the first separator.

Dependencies are inferred from the claim text.