Battery cell, battery, electrical apparatus, and method and system for manufacturing battery cell

A battery cell comprising:

• a case having an opening;
• an electrode assembly provided within the case;
• an end cover assembly for closing the opening, wherein the end cover assembly comprises an end cover, an insulating member, and a connection adapter member, the end cover is provided with an electrode terminal, and is configured to cover the opening and is connected to the case, the insulating member is provided on one side of the end cover facing the electrode assembly, and the connection adapter member is used for being electrically connected to the electrode terminal and to the electrode assembly;
• and
• a buffer member provided on one side of the insulating member facing the electrode assembly, wherein the buffer member is pressed against the connection adapter member for buffering the connection adapter member when the battery cell vibrates,
• wherein the insulating member comprises an insulating body and an extension portion which are connected to each other, the insulating body is configured to be connected to the end cover, the extension portion extends and protrudes from one side of the insulating body facing the electrode assembly and forms a concave portion recessed in a direction away from the electrode assembly, and the connection adapter member is at least partially accommodated in the concave portion, the extension portion is integrally formed with the insulating body and extends toward the electrode assembly to form a concave portion that at least partially surrounds and accommodates the connection adapter member, the extension portion being pressed directly against the electrode assembly and configured to act jointly with the buffer member to restrict movement of the electrode assembly relative to the end cover assembly.