Cover plate assembly, battery, electricity-consuming apparatus and method for sealing through hole

A cover plate assembly, comprising

• a plate body comprising a first surface and a second surface, and a through hole penetrating the first surface and the second surface;
• and
• a sleeve assembly for sealing the through hole, comprising:
• a sleeve comprising a first end and a second end that are opposed to each other, the first end comprising an opening;
• a nail body comprising a body portion, wherein a radial size of the body portion is larger than a size of a barrel diameter of the sleeve, so that after the sleeve is inserted into the through hole in a axial direction, the body portion can be inserted into the sleeve from the opening and press an inner wall of the sleeve to form a protrusion for riveting the sleeve to the through hole on an outer wall of the sleeve,
• wherein the sleeve further comprises a side wall and a flange portion connected to the side wall, and when the sleeve is in the through hole and the nail body is in the sleeve, an outer edge of the flange portion contacts the first surface of the plate body to form a sealing interface, so that a gap is formed between the flange portion and the first surface of the plate body.