Top cover assembly of cell, cell, and power battery

A top cover assembly of a cell, the top cover assembly comprising:

• an insulation cover plate;
• a metallic support plate, the metallic support plate and the insulation cover plate being stacked in a thickness direction;
• a terminal assembly passing through the insulation cover plate and the metallic support plate in the thickness direction to connect the insulation cover plate and the metallic support plate;
• and
• an elastic seal being disposed in a circumferential direction of the top cover assembly, having a sleeve-like shape, and surrounding a peripheral outside of the metallic support plate and a peripheral outside of the insulation cover plate in the circumferential direction, wherein the elastic seal has a positioning flange provided on an inner peripheral surface thereof, wherein the positioning flange is sandwiched between the metallic support plate and the insulation cover plate, and wherein the elastic seal is configured to be in a sealing fit with a housing of the cell,
• wherein in a direction perpendicular to the thickness direction, an outer peripheral surface of the insulation cover plate is located at a side of the insulation cover plate that faces away from the terminal assembly,
• the outer peripheral surface of the insulation cover plate extends along the circumferential direction of the top cover assembly, and has a slot mated with the positioning flange,
• an end of the positioning flange extending towards the terminal assembly is inserted into the slot, and
• the positioning flange supports the metallic support plate in a direction toward a top of the cell.