Battery and electric device

An upper cover comprises a main body part and a surrounding edge, and at least one end of the main body part along a first direction is provided with the surrounding edge to form an accommodating space; the opening is formed in at least one end of the main body part in the second direction, the structure of the upper cover is simplified, and light weight is achieved conveniently. Meanwhile, the first reinforcing piece is arranged on at least one of the outer surface, the inner surface and the interior of the main body part, so that the structural strength of the upper cover is improved through the reinforcing piece on the premise of meeting the requirement for light weight, and the risk that the upper cover deforms and cracks due to poor flatness of the frame is reduced.