An easy-to-remove member includes a first surface and a second surface. The first surface includes a weak adhesive portion that is bonded with a bottom surface of a battery, and a strong adhesive portion that is bonded with a top surface of the battery. A separating structure is arranged at a boundary between the weak adhesive portion and the strong adhesive portion and is to separate the easy-to-remove member into a first body and a second body. The first body corresponds to the weak adhesive portion. The second body corresponds to the strong adhesive portion. At least a part of the second surface of the first body is bonded with an inner wall of a battery cabin and the second surface of the second body is attached to the inner wall of the battery cabin.