A battery cell, comprising: a housing, with an opening; an electrode assembly, being accommodated in the housing, the electrode assembly comprising a tab; an end cover assembly, comprising an end cover, an electrode terminal and an insulating member, the end cover being used to cover at the opening, the electrode terminal being mounted to the end cover, the insulating member located on one side of the end cover facing the electrode assembly; and a current collecting member, for connecting the electrode terminal and the tab, so that the tab is electrically connected to the electrode terminal; wherein a first concave portion is formed on one side of the insulating member facing the electrode assembly, and the first concave portion is configured to accommodate at least a part of the tab and/or at least a part of the current collecting member, a first convex portion is formed on one side of the insulating member facing away from the electrode assembly at a position corresponding to the first concave portion, a second concave portion is formed on the side of the end cover facing the electrode assembly, and the second concave portion is used for accommodating the first convex portion; wherein the end cover comprises a first body, the first body being used to cover at the opening; the first body has a first inner surface facing the electrode assembly, and the second concave portion is recessed from the first inner surface along a direction facing away from the electrode assembly; wherein the end cover further comprises a second convex portion; the first body further has a first outer surface provided opposite to the first inner surface, and the second convex portion is protrudingly provided on the first outer surface and is located at a position corresponding to the second concave portion; and wherein the second convex portion has a first end surface, the second convex portion extends to the first end surface from the first outer surface along the direction facing away from the electrode assembly, and the first end surface does not exceed the electrode terminal in the direction facing away from the electrode assembly. a housing, with an opening; an electrode assembly, being accommodated in the housing, the electrode assembly comprising a tab; an end cover assembly, comprising an end cover, an electrode terminal and an insulating member, the end cover being used to cover at the opening, the electrode terminal being mounted to the end cover, the insulating member located on one side of the end cover facing the electrode assembly; and a current collecting member, for connecting the electrode terminal and the tab, so that the tab is electrically connected to the electrode terminal; wherein a first concave portion is formed on one side of the insulating member facing the electrode assembly, and the first concave portion is configured to accommodate at least a part of the tab and/or at least a part of the current collecting member, a first convex portion is formed on one side of the insulating member facing away from the electrode assembly at a position corresponding to the first concave portion, a second concave portion is formed on the side of the end cover facing the electrode assembly, and the second concave portion is used for accommodating the first convex portion; wherein the end cover comprises a first body, the first body being used to cover at the opening; the first body has a first inner surface facing the electrode assembly, and the second concave portion is recessed from the first inner surface along a direction facing away from the electrode assembly; wherein the end cover further comprises a second convex portion; the first body further has a first outer surface provided opposite to the first inner surface, and the second convex portion is protrudingly provided on the first outer surface and is located at a position corresponding to the second concave portion; and wherein the second convex portion has a first end surface, the second convex portion extends to the first end surface from the first outer surface along the direction facing away from the electrode assembly, and the first end surface does not exceed the electrode terminal in the direction facing away from the electrode assembly.