| abstract |
The present invention relates to a nonaqueous electrolyte secondary battery comprising: a flat wound electrode body in which an elongated positive electrode, an elongated negative electrode, and an elongated separator (70) for separating the positive and negative electrodes overlap each other and are rolled along the longitudinal direction around; and non-aqueous electrolytes. The separator (70) includes a base material layer (90) formed of a resin base material, and a heat-resistant layer (80) provided on one surface of the base material layer (90), and between the base material layer (90) and the resistance The bond strength between thermal layers (80) is 0.19-400N/10mm. |