Abstract: An electrode structure of rechargeable battery includes a battery tab stack, an electrode lead, a welding protective layer and a welding seam. The battery tab stack is formed by extension of a plurality of electrode sheets. The electrode lead is joined to one side of the battery tab stack. The welding protective layer is joined to another side of the battery tab stack opposite to the electrode lead. The welding seam extends from the welding protective layer to the electrode lead through the battery tab stack.

Abstract: A lens array includes an edge lens region provided with multiple first type lenslets, a middle lens region provided with multiple second type lenslets and a center lens region provided with multiple third type lenslets. One of the first type lenslets has a first curved surface with a first vertex, one of the second type lenslets has a second curved surface with a second vertex, and one of the third type lenslets has a third curved surface with a third vertex. A first tangent plane to the first curved surface at the first vertex, a second tangent plane to the second curved surface at the second vertex, and a third tangent plane to the third curved surface at the third vertex are parallel to or coincide with each other.