NOVELTY - The core (100) has a first electrode active material layer (111) coated on an inner surface of a first current collecting substrate (102). A second electrode active material layer (113) is coated on an inner surface of a second current collecting substrate (104). A separator (112) is sandwiched between the first electrode active material layer and the second electrode active material layer. Electrolyte is retained in the separator. An adhesive layer (114) is arranged between the first electrode active material layer and the separator.    USE - Bendable robust laminated electric core for a thin film lithium-ion battery that is used in an electronic product such as laptop and mobile phone.    ADVANTAGE - The core is cost-effective and simple in structure, and has high capacity, prolonged service life and better cycle performance. The core is provided with an elastic robust overlapping interface so as to prevent cracking of the first electrode active material layer along peripheral edges even after frequent bending of the core. The insulating coating in the thin adhesive layer melts so as to provide an intimate interfacial contact between adjacent layers during heating and pressing process so as to effectively prevent delamination or cracking between the layers when a battery cell is bent.    DETAILED DESCRIPTION - The adhesive layer is provided with particles that are dispersed in a binder matrix and encapsulated by an insulating coating. The binder matrix includes styrene-butadiene rubber, polyvinylidene fluoride and carboxyl methyl cellulose. The insulating coating is made of polyvinyl chloride, polyethylene terephthalate, polyimide, polypropylene, polyethylene, silica gel, acrylic and/or epoxy materials.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a bendable robust electric core for a thin film lithium-ion battery.    Bendable robust electric core (100)    Current collecting substrates (102, 104)    Electrode active material layers (111, 113)    Separator (112)    Adhesive layer (114)