The invention relates to a water-based high-
viscosity glued diaphragm, a preparation method thereof and an application of the diaphragm in a battery. The water-based high-
viscosity glued diaphragm comprises a base membrane, and a positive
polymer layer and a negative
polymer layer which are respectively arranged at two sides of the base membrane, wherein a positive
ceramic layer is arranged between the base membrane and the positive
polymer layer, and / or a negative
ceramic layer is arranged between the base membrane and the negative polymer layer; a binder in the positive polymer layer and a battery positive
electrode piece is the same type of binder, and a binder in the negative polymer layer and a battery negative
electrode piece is the same type of binder. The diaphragm disclosed by theinvention has the characteristics of small
coating amount of coatings on two sides, light and thin coatings, high cohesiveness and the like, so the shaping effect of a
battery cell is optimal, and module boxing is facilitated; meanwhile, a module limiting effect is achieved. Moreover, the risk of hole blockage of the diaphragm is low, so the
internal resistance of the
battery cell is stable and controllable, the
lithium precipitation risk is reduced, and the cycle life and safety performance of the
battery cell are ensured.