Current collector assembly with insulating coating, pole piece, preparation method and application

The invention belongs to the technical field of secondary batteries, and particularly relates to a current collector with an insulating coating, a pole piece, a battery and a preparation method and application thereof. According to the current collector assembly with the insulating coating and the pole piece, the structure of the current collector is optimized, the ultrathin insulating coating (0.2-5 [mu] m) is arranged on one side or two sides of the reserved active material layer position area, or preferably, the conductive bottom coating is arranged between the traditional current collector and the active material layer; the ultrathin insulating coating is arranged on one side or two sides of the conductive bottom coating, so that the safety improvement of the traditional ceramic coating on preventing the short circuit in the battery cell is kept, the processing of a normal pole piece is not influenced at all, and the defects that the traditional ceramic coating is large in thickness (10-100 microns), diff