Battery cell, battery, and method and apparatus for preparing battery cell

Provided by embodiments of the present application are a battery cell, a battery, an electric apparatus, and an apparatus for preparing the battery cell. The battery cell comprises: a housing, which is of a hollow shape and is provided with an opening; and an end cover assembly, which comprises an end cover and an insulating member, wherein the end cover is used for connecting to the opening of the housing and is at least partially inserted into the housing, and the part of the end cover that is inserted into the housing has an end face and first side faces; the end face is substantially perpendicular to the insertion direction of the end cover; the first side faces are distributed along the periphery of the end face and are opposite inner wall faces of the housing; the inner wall faces are substantially parallel to the insertion direction of the end cover; the end face and the first side faces intersect and form a first edge; the insulating member is connected to the end face; and the insulating member extends towards the inner wall faces in a first direction so as to exceed the first edge. According to the technical solution of the embodiments of the present application, the safety of the battery cell can be enhanced.