Jelly roll and battery

A jelly roll, comprising a straight section and corner sections located at two opposite ends of the straight section, and comprising:

• a negative electrode sheet and a positive electrode sheet, both of which are laminated, wherein
• the negative electrode sheet comprises a negative electrode current collector, and the negative electrode current collector has a first surface and a second surface opposite to the first surface along a first direction, the first surface is provided with a first coating layer, and the second surface is provided with a second coating layer;
• the first coating layer and the second coating layer are provided with a plurality of grooves, and centers of two most adjacent grooves are spaced apart by a first distance;
• the positive electrode sheet is provided with a plurality of 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 and a surface on which the grooves of the negative electrode sheet are located are provided opposite to each other;
• wherein the convex parts and the concave parts being provided corresponding to each other refers to that:
• vertical projections of the convex parts along the first direction and vertical projections of the concave parts along the first direction overlap;
• along a width direction of the grooves, vertical projections of the convex parts of the positive electrode sheet onto the negative electrode sheet in a thickness direction of the negative electrode sheet have a size greater than the first distance;
• wherein the size is a projection length along a length direction of the negative electrode sheet;
• wherein the convex parts and the grooves are provided opposite to each other, and the concave parts and the grooves are provided opposite to each other;
• wherein along the width direction of the grooves, a size of the vertical projections of the convex parts of the positive electrode sheet onto the negative electrode sheet in the thickness direction of the negative electrode sheet is R1, and the first distance is S, with R1/S=1.02˜8;
• wherein a groove width of the grooves is M, with R1/M=8˜50;
• R1=0.3 mm˜8 mm;
• M=30 μm˜170 μm;
• S=0.5 mm˜3 mm;
• and
• wherein the jelly roll further comprises an electrolyte doped with 1,4-dicyano-2-butene, and a content of the 1,4-dicyano-2-butene in the electrolyte is 0.05%˜3%.