Abstract: The present invention provides a cylindrical secondary electrode including a first electrode plate, a second electrode plate, a separator interposed between the first electrode plate and the second electrode plate, and a case having a space for receiving the electrode assembly, wherein the cylindrical secondary electrode may include a core element having a space at the center thereof and having a tubular shape with a circular cross section, which is inserted into a space at the center of an electrode assembly and has at least one slit including a bent portion.

Abstract: A photoelectric panel assembly includes a photoelectric panel, a support rail coupled to a rear surface of the photoelectric panel, the support rail including a base portion parallel to and spaced apart from the photoelectric panel, flange portions parallel to and adhered to the photoelectric panel, slope portions between the base portion and respective ones of the flange portions, and rounded portions between the base portion and the slope portions and between the slope portions and the flange portions.

Abstract: A rechargeable battery includes an electrode assembly; a can housing the electrode assembly and having an open end, a bottom surface substantially opposite to the open end, a first planar surface and a second planar surface, wherein the first planar surface and the second planar surface each have a first fracture portion that facilitates buckling of the can under compression, wherein a first axis is defined extending from the bottom surface to the open end, and wherein the first fracture portion extends along a second axis in a direction substantially perpendicular to the first axis; and a cap plate sealing the open end of the can.

Abstract: A rechargeable battery includes an electrode assembly; a can housing the electrode assembly and having an open end, a bottom surface substantially opposite to the open end, a first planar surface and a second planar surface, wherein the first planar surface and the second planar surface each have a first fracture portion that facilitates buckling of the can under compression, wherein a first axis is defined extending from the bottom surface to the open end, and wherein the first fracture portion extends along a second axis in a direction substantially perpendicular to the first axis; and a cap plate sealing the open end of the can.