▎ 摘　　要

NOVELTY - The utility model claims a composite diaphragm for winding type battery and winding type battery, belonging to the technical field of battery. The composite diaphragm for winding type battery of the utility model comprises a diaphragm; one end of the diaphragm is bonded with a conductive foil material; the conductive foil material is a metal foil material or graphite film or graphene film. The composite diaphragm for winding battery of the utility model is provided with a conductive foil at one end of the diaphragm; when preparing the coiled battery, the conductive foil material is located at the outermost layer of the battery core; on one hand, the conductive foil material is used to avoid the ion on the cathode sheet from reacting with the metal shell; on the other hand, it can protect the electrode material layer on the pole piece jointed with it not to fall off easily. Furthermore, the composite diaphragm of the invention is convenient for the diaphragm and conductive foil to locate when processing the winding type battery.