A battery cell, comprising: a housing, comprising an opening; an electrode assembly, accommodated in the housing; and an end cover assembly, comprising an end cover and an electrode terminal, the end cover being used for covering at the opening, the electrode terminal being installed on the end cover, and being used for electrical connection with the electrode assembly; wherein, the end cover comprises a first body and a first convex portion, the first body comprises a first inner surface and a first outer surface arranged oppositely, and the first convex portion extends to a first end surface from the first inner surface along a direction facing the electrode assembly, a position on the first body corresponding to the first convex portion is formed with a first concave portion recessed from the first outer surface along the direction facing the electrode assembly, the first concave portion is configured to accommodate the electrode terminal, and the electrode terminal is located on a side of the first end surface away from the electrode assembly; wherein the end cover assembly further comprises an insulating member; the insulating member is located on a side of the end cover facing the electrode assembly, and the insulating member is used for separating the electrode assembly and the end cover; wherein the insulating member comprises a second body and a second concave portion, the second body is located on a side of the first body facing the electrode assembly, the second body comprises a second inner surface and a second outer surface arranged oppositely, the second concave portion is recessed from the second outer surface along a direction facing the electrode assembly, and the second concave portion is configured to accommodate the first convex portion. a housing, comprising an opening; an electrode assembly, accommodated in the housing; and an end cover assembly, comprising an end cover and an electrode terminal, the end cover being used for covering at the opening, the electrode terminal being installed on the end cover, and being used for electrical connection with the electrode assembly; wherein, the end cover comprises a first body and a first convex portion, the first body comprises a first inner surface and a first outer surface arranged oppositely, and the first convex portion extends to a first end surface from the first inner surface along a direction facing the electrode assembly, a position on the first body corresponding to the first convex portion is formed with a first concave portion recessed from the first outer surface along the direction facing the electrode assembly, the first concave portion is configured to accommodate the electrode terminal, and the electrode terminal is located on a side of the first end surface away from the electrode assembly; wherein the end cover assembly further comprises an insulating member; the insulating member is located on a side of the end cover facing the electrode assembly, and the insulating member is used for separating the electrode assembly and the end cover; wherein the insulating member comprises a second body and a second concave portion, the second body is located on a side of the first body facing the electrode assembly, the second body comprises a second inner surface and a second outer surface arranged oppositely, the second concave portion is recessed from the second outer surface along a direction facing the electrode assembly, and the second concave portion is configured to accommodate the first convex portion.