Secondary battery and battery module

A secondary battery includes a first electrode sheet including a plurality of first conductive layers and a plurality of first bending portions and a second electrode sheet including a plurality of second conductive layers and a plurality of second bending portions. Two adjacent first conductive layers are connected through one of the first bending portions, and two adjacent second conductive layers are connected through one of the second bending portions. The plurality of first conductive layers and the plurality of second conductive layers are alternately stacked. Viewed along the first direction perpendicular to a surface of the first conductive layer, each first bending portion includes a first edge extending along a second direction perpendicular to the first direction; and each second bending portion includes a second edge extending along a third direction perpendicular to the first direction. The second direction is different from the third direction.