Battery core with external sheath of wound lithium-ion battery

The invention discloses a battery core with an external sheath of a wound lithium-ion battery. The battery core comprises press plates, roll cores, positive plates, negative plates and an adhesive tape, wherein one positive plate and one negative plate which are arranged at an interval are inserted into an inner cavity of each roll core; a laminated installation structure is adopted by the roll cores; each press plate is a rectangular thin plate made of an insulating material and the sizes of long sides and wide sides are at least 1.0mm greater than those of the corresponding sides of the rollcores; one press plate is arranged on each of one upper end surface and one lower end surface of the laminated roll cores; and the adhesive tape is overlapped with the press plates located on the upper layer and the lower layer to form a constraint structure of the press plates on the upper layer and the lower layer on the laminated roll cores. Through the constraint structure, the laminated rollcores are more reliable,