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

An end cover body comprises a first edge and a second edge which are oppositely arranged in the width direction of the end cover assembly; the fool-proof structural part is located on the side of the end cover body facing the interior of the battery cell; the electrode terminal passes through the end cover body, comprises a connecting area facing the interior of the battery cell; the connecting area is used for electrically connecting with a tab of an electrode assembly; in the width direction, the distance from the connecting area to the first edge is larger than the distance from the connecting area to the second edge; the fool-proof structural part is at least partially located on the side of the connecting area close to the first edge.