INSULATING FILM, BATTERY CELL, BATTERY AND ELECTRIC DEVICE

Embodiments of the present application provide an insulating film and related devices. The insulating film is configured to wrap a battery assembly, the insulating film includes a bottom coverage area, N side coverage areas and N pairs of bonding areas, where N is an integer larger than 2; the bottom coverage area has N sides, the N side coverage areas are respectively connected to the bottom coverage area outside the N sides, and can be respectively bend toward the bottom coverage area along the N sides; each pair of the N pairs of bonding areas is located between two adjacent side coverage areas of the N side coverage areas, and is connected to the two adjacent side coverage areas respectively; each pair of bonding areas is configured to make the bottom coverage area and the N sides coverage areas form a space wrapping the battery assembly by bonding surfaces on the same side of each pair of bonding areas when the N sides coverage areas bend toward the bottom coverage area. According to the technical solution of the embodiments of the present application, the sealed wrapping of a wrapping area can be realized.