END COVER ASSEMBLY, BATTERY CELL, BATTERY, AND ELECTRIC APPARATUS

An end cover assembly for a battery cell includes an end cover provided with a through hole, a sealing member configured to seal the through hole and connected to the end cover to form a joint, and a barrier member provided at the through hole with a channel formed between at least part of the barrier member and a side wall of the through hole. The channel is configured to guide fluid in the battery cell to the joint.