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 . <EOS>