ENCAPSULATION STRUCTURE OF BATTERY CELL

A packaging structure of a battery cell is disclosed, including a sealant and a packaging bag. The packaging bag includes an accommodation space and a seal edge configured to seal the accommodation space. A direction in which the tab extends from the accommodation space out of the packaging bag is defined as a first direction. In the first direction, the tab includes a first region, a second region, and a third region that are connected to each other in sequence. The first region is electrically connected to the electrode assembly in the accommodation space. The third region is exposed out of the packaging bag. The sealant surrounds the second region. The second region is disposed in the seal edge. The seal edge includes a first surface and a second surface that are disposed opposite to each other. A protruding portion is disposed on the first surface at a position corresponding to the sealant. The second surface is a flat surface. The first surface includes a first seal region and a non-seal region that are connected in sequence along the first direction. The second surface includes a second seal region. In the first direction, a width of the first seal region is n, and a width of the second seal region is m, where n < m. The packaging structure of the battery cell helps to improve reliability of the battery cell.