Abstract: A battery housing includes a housing body and a cover body. An accommodating cavity with an opening is formed on one side of the housing body along a third direction, and the cover body is configured to cover the opening. The cover body includes a body portion and an end portion, the end portion has a step structure and includes a step main portion and a first step wall, the step main portion includes a second step wall, the first step wall is connected between the second step wall and the body portion, the first step wall is formed with a liquid injection hole, and the second step wall is formed with a terminal post hole.

Abstract: In one aspect, an electrode plate includes a foil. The foil includes a foil body and a first tab connected to each other. The first tab protrudes beyond a side edge of the foil body in a first direction. The foil body includes a first end portion and a second end portion that are disposed opposite to each other in a second direction. The first tab and the first end portion are spaced apart by a preset distance. A dressing layer is provided on at least one surface of the foil body in a thickness direction of the electrode plate. The electrode plate further includes a second tab disposed between the first end portion and the first tab that is electrically connected to the foil body. The second tab and the first tab protrude beyond a same side edge of the foil body.

Abstract: A battery casing and a battery are disclosed. The battery casing comprises a casing body, an accommodating space being defined in the casing body, the casing body being provided with two open ends, and each open end being in communication with the accommodating space; a lower cover, the lower cover being coupled to one end of the casing body for closing one open end; an upper cover, the upper cover being coupled to the other end of the casing body for closing the other open end, the lower cover and/or the upper cover being a plate-shaped member(s), and side walls of the casing body being perpendicular to the plate-shaped member(s).