Thin film lithium-ion battery

A thin film lithium-ion battery unit, comprising:

• a positive current collecting substrate;
• a positive electrode active material layer coated on an inner surface of the positive current collecting substrate;
• a negative current collecting substrate;
• a negative electrode active material layer coated on an inner surface of the negative current collecting substrate;
• a separator sandwiched between the positive electrode active material layer and the negative electrode active material layer;
• an electrolyte retained at least in the separator, wherein the positive electrode active material layer, the separator and the negative electrode active material layer constitute a laminated electric core;
• an outer conductive frame being spaced apart from the positive current collecting substrate and encompassing the positive current collecting substrate with a gap formed therebetween, wherein the outer conductive frame and the positive current collecting substrate are coplanar, and wherein the outer conductive frame encloses the positive current collecting substrate along perimeter of the positive current collecting substrate;
• a glue layer disposed in the gap;
• and
• a sealant layer disposed along a periphery of the laminated electric core between the positive current collecting substrate and the negative current collecting substrate so as to seal the laminated electric core, wherein the sealant layer is in direct contact with the laminated electric core, and wherein the glue layer is in direct contact with the sealant layer.