An electricity supply system includes a circuit substrate, a first electrode substrate, a second electrode substrate, a first package unit, and a second package unit. The circuit substrate includes at least a separating area. The first electrode substrate includes a first current collector and a first active material layer, which is disposed opposed to the separating area and is located between the separating area and the first current collector. The second electrode substrate includes a second current collector and a second active material layer, which is disposed opposed to the separating area and is located between the separating area and the second current collector. The first and second package units are located between the first electrode substrate, the second electrode substrate and the circuit substrate respectively.