A battery cell , comprising: an electrode assembly , comprising a body portion and a first tab , wherein a first size L1 of the body portion in a length direction thereof is greater than a second size L2 of the body portion in a width direction thereof; and the first tab is located on at least one end of the body portion in the width direction, the first tab has a third size L3 in the length direction, and the first size L1, the second size L2, and the third size L3 satisfy 0.5L2≤L3≤L1, wherein the battery cell further comprises: a housing , wherein the electrode assembly is located inside the housing ; a first end cap , located on a side of the electrode assembly in the length direction and configured to close a first opening of the housing ; a first electrode terminal , disposed on the first end cap ; and a first adapting component , configured to connect the first electrode terminal and the first tab , characterized in that the electrode assembly further comprises a second tab with a polarity opposite to that of the first tab , the first tab comprises two first sub-tabs , the two first sub-tabs are respectively located on two ends of the body portion in the width direction, the second tab comprises two second sub-tabs , and the two second sub-tabs are respectively located on two ends of the body portion in the width direction, wherein the first sub-tab and the second sub-tab on a same end of the body portion are spaced apart in the length direction. an electrode assembly , comprising a body portion and a first tab , wherein a first size L1 of the body portion in a length direction thereof is greater than a second size L2 of the body portion in a width direction thereof; and the first tab is located on at least one end of the body portion in the width direction, the first tab has a third size L3 in the length direction, and the first size L1, the second size L2, and the third size L3 satisfy 0.5L2≤L3≤L1, wherein the battery cell further comprises: a housing , wherein the electrode assembly is located inside the housing ; a first end cap , located on a side of the electrode assembly in the length direction and configured to close a first opening of the housing ; a first electrode terminal , disposed on the first end cap ; and a first adapting component , configured to connect the first electrode terminal and the first tab , characterized in that the electrode assembly further comprises a second tab with a polarity opposite to that of the first tab , the first tab comprises two first sub-tabs , the two first sub-tabs are respectively located on two ends of the body portion in the width direction, the second tab comprises two second sub-tabs , and the two second sub-tabs are respectively located on two ends of the body portion in the width direction, wherein the first sub-tab and the second sub-tab on a same end of the body portion are spaced apart in the length direction. a housing , wherein the electrode assembly is located inside the housing ; a first end cap , located on a side of the electrode assembly in the length direction and configured to close a first opening of the housing ; a first electrode terminal , disposed on the first end cap ; and a first adapting component , configured to connect the first electrode terminal and the first tab , characterized in that the electrode assembly further comprises a second tab with a polarity opposite to that of the first tab , the first tab comprises two first sub-tabs , the two first sub-tabs are respectively located on two ends of the body portion in the width direction, the second tab comprises two second sub-tabs , and the two second sub-tabs are respectively located on two ends of the body portion in the width direction, wherein the first sub-tab and the second sub-tab on a same end of the body portion are spaced apart in the length direction. <EOS>