| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a secondary battery capable of avoiding deterioration in productivity due to winding looseness in a wound electrode body, in a configuration where a flat-shaped wound electrode body including a heat-resistant layer is used.SOLUTION: The present invention provides a secondary battery including a flat-shaped wound electrode body accommodated in a battery case. In the secondary battery, the wound electrode body includes a positive electrode sheet, a negative electrode sheet, and a separator sheet arranged between the positive and negative electrode sheets. A heat-resistant layer is arranged between the separator sheet and at least one of the positive electrode sheet and the negative electrode sheet. The heat-resistant layer contains a filler, an acrylic binder, and a rosin ester tackifier.</p> |
