Jelly roll and battery

A jelly roll includes: a negative electrode sheet and a positive electrode sheet, where along a first direction, the negative electrode sheet includes a negative electrode current collector having a first surface being provided with a first coating layer and a second surface being provided with a second coating layer; the first coating layer is provided with multiple grooves, and centers of two adjacent grooves are spaced apart by a first distance; the positive electrode sheet is provided with multiple convex parts and concave parts corresponding to the convex parts, and a surface on which the convex parts of the positive electrode sheet are located is opposite to a surface on which the grooves of the negative electrode sheet are located; and along a width direction of the grooves, a size of projections of the convex parts on the negative electrode sheet is greater than the first distance.