Battery cell diaphragm and battery cell thereof

The utility model relates to the technical field of battery cell diaphragms, in particular to a battery cell diaphragm and a battery cell thereof. The battery cell diaphragm comprises a base film and a film covering layer, the film covering layer comprises a ceramic coating and a PVDF adhesive layer, the ceramic coating is laid on the base film, and the PVDF adhesive layer is laid on the ceramic coating; the PVDF glue layer comprises a plurality of plane areas and a plurality of bending areas. In the length direction of the base film, the plane areas and the bending areas are alternately arranged in sequence; when the battery cell diaphragm is wound into a roll core, the bending area is a bending steering position of the winding of the battery cell diaphragm, and the plane area is a straight area of the winding of the battery cell diaphragm; and gaps exist among the PVDF macromolecular chains in the bending area. As the gaps exist between the PVDF polymer chains in the bending area, electrolyte in the battery