| 摘要 |
<p>A wound electrode assembly 12 includes a columnar conductive winding core 14, a negative electrode sheet 15, a positive electrode sheet 16, a separator 17 interposed between the negative electrode sheet 15 and the positive electrode sheet 16, and a conductive winding core 14 having a first flat portion 20 to which an exposed portion 26 of the negative electrode sheet 15 is joined. An edge 28 of the conductive winding core 14 is not positioned on the surface of a curved portion 18, but is positioned inside a circle 23 with a predetermined radius in the radial direction of the conductive winding core 14. Joints 27 of the first flat portion 20 and the exposed portion 26 are positioned inside the circle 23 with the predetermined radius in the radial direction of the conductive winding core 14.</p> |
