The invention provides a flexible electrical core. The flexible electrical core comprises a first pole piece containing a first current collector and a first active material layer; a second pole piece containing a second current collector and a second active material layer; an isolated film; and an electrolyte. The first current collector comprises a first circumference blank area surrounding the first active material layer, but not comprising the first active material layer; the second current collector comprises a second circumference blank area surrounding the second active material layer, but not comprising the second active material layer; the isolated film comprises an insulating layer, a first polyolefin layer bonding at one side of the insulating layer and facing to the first active material layer, and a second polyolefin layer bonding the other side of the insulating layer and facing to the second active material layer, wherein, the first circumference blank area is bended and is bound with the first polyolefin layer, and the second circumference blank area is bended and bound with the second polyolefin layer.