A battery cell includes an electrode assembly and a packaging bag configured to accommodate the electrode assembly. The electrode assembly includes a first electrode plate, a separator, and a second electrode plate that are stacked. A first tab is disposed on the first electrode plate. The first tab protrudes from the packaging bag. The first tab includes a connecting portion accommodated in the packaging bag. A first insulation layer is disposed on the connecting portion. The first insulation layer includes a free end towards the electrode assembly.