End cover, end cover assembly, battery monomer, battery and power utilization device

The utility model relates to an end cover, an end cover assembly, a battery monomer, a battery and a power utilization device, the end cover comprises a cover body which is provided with a liquid injection hole penetrating through two sides of the cover body in the thickness direction, the liquid injection hole comprises a first hole section and a second hole section which are arranged from top to bottom along the thickness direction of the cover body, and two close ends of the first hole section and the second hole section are communicated. Wherein the first hole section is used for containing the liquid injection nozzle, at least part of the hole wall is attached to the outer wall of the liquid injection nozzle to form an anti-overflow area, and the anti-overflow area is located above a liquid injection opening in the liquid injection nozzle. According to the battery cell, all electrolyte flowing out of the electrolyte injection nozzle smoothly flows into the battery cell through the second hole section, an