A battery cell, comprising: a shell, comprising an opening; an electrode unit, accommodated in the shell, the electrode unit comprising a main body portion and a tab portion protruding from the main body portion; a cap assembly, for connecting with the shell, and covering and closing the opening; and a first insulating member, accommodated in the shell and adapted to isolate at least part of the main body portion from the shell, the first insulating member comprising a first insulating plate, and the first insulating plate being disposed on a side of the main body portion facing the cap assembly and being attached to a surface of the main body portion from which the tab portion is drawn out, wherein the first insulating member further comprises: two second insulating plates, respectively disposed on two sides of the main body portion in a first direction; and two third insulating plates, respectively disposed on two sides of the main body portion in a second direction, wherein each third insulating plate connects the two second insulating plates; an end of the second insulating plate close to the cap assembly is connected with the first insulating plate, and/or an end of the third insulating plate close to the cap assembly is connected with the first insulating plate; the first direction and the second direction are arranged to intersect with each other, and the first direction and the second direction are respectively perpendicular to a thickness direction of the cap assembly. a shell, comprising an opening; an electrode unit, accommodated in the shell, the electrode unit comprising a main body portion and a tab portion protruding from the main body portion; a cap assembly, for connecting with the shell, and covering and closing the opening; and a first insulating member, accommodated in the shell and adapted to isolate at least part of the main body portion from the shell, the first insulating member comprising a first insulating plate, and the first insulating plate being disposed on a side of the main body portion facing the cap assembly and being attached to a surface of the main body portion from which the tab portion is drawn out, wherein the first insulating member further comprises: two second insulating plates, respectively disposed on two sides of the main body portion in a first direction; and two third insulating plates, respectively disposed on two sides of the main body portion in a second direction, wherein each third insulating plate connects the two second insulating plates; an end of the second insulating plate close to the cap assembly is connected with the first insulating plate, and/or an end of the third insulating plate close to the cap assembly is connected with the first insulating plate; the first direction and the second direction are arranged to intersect with each other, and the first direction and the second direction are respectively perpendicular to a thickness direction of the cap assembly. two second insulating plates, respectively disposed on two sides of the main body portion in a first direction; and two third insulating plates, respectively disposed on two sides of the main body portion in a second direction, wherein each third insulating plate connects the two second insulating plates; an end of the second insulating plate close to the cap assembly is connected with the first insulating plate, and/or an end of the third insulating plate close to the cap assembly is connected with the first insulating plate; the first direction and the second direction are arranged to intersect with each other, and the first direction and the second direction are respectively perpendicular to a thickness direction of the cap assembly.