Battery cover plate assembly, battery and manufacturing method of battery cover plate assembly

A battery cover plate assembly, comprising:

• a cover plate, wherein a first connection portion is arranged on the cover plate;
• and
• an insulating piece, wherein the insulating piece is disposed on one side of the cover plate, the insulating piece is provided with a second connection portion, and the first connection portion is connected to the second connection portion,
• wherein one of the first connection portion and the second connection portion is a mounting hole and the other one is a protrusion, the protrusion is in an interference fit with the mounting hole, an area of an opening of the mounting hole is less than a maximum area of a cross section of the mounting hole, and the protrusion is inserted into the mounting hole through the opening of the mounting hole,
• wherein the mounting hole is a blind hole, and the area of the opening of the mounting hole is less than the area of the bottom of the mounting hole,
• wherein a top end of the protrusion is spaced apart from the bottom of the mounting hole,
• wherein a distance between the top end of the protrusion and the bottom of the mounting hole is 0.01 mm to 1 mm.