End cover assembly, battery cell, battery, and electric apparatus

An end cover assembly, comprising:

• a cover plate, provided with an electrode lead-out hole;
• an electrode terminal, located on one side of the cover plate in a thickness direction and covering the electrode lead-out hole;
• and
• a sealing element, disposed between the electrode terminal and the cover plate so as to seal the electrode lead-out hole along a circumference of the electrode lead-out hole, wherein the sealing element comprises a body and a first insulating element;
• the first insulating element is connected to the body and has a higher melting point than the body;
• and the first insulating element is configured to insulate the electrode terminal from the cover plate after the body is melted,
• wherein the cover plate further comprises a flange;
• the flange surrounds the electrode lead-out hole and protrudes toward the electrode terminal in the thickness direction of the cover plate;
• and the first insulating element is located only on a side of the flange farther away from the electrode lead-out hole in a radial direction of the electrode lead-out hole.