Blended polymer composite films of PEO + PVP:Li+ and also embedded with copper-constantan nanoparticles (CC NPs) have been prepared by a solution casting method. Structural and electrical properties are carried out by XRD and impedance analyser. The XRD profiles of the prepared samples revealed their semi-crystalline nature. FT-IR and Raman analysis affirms the complex formation between the polymer and dopant ions. The surface morphological studies and the size evaluation of the inclusive CC NPs which were dispersed in the PEO + PVP:Li+ solid polymer electrolytes have been systematically analysed by SEM and TEM. The ionic conductivity enhancement is observed with increasing the CC NPs concentration in the PEO + PVP:Li+ SPE films. The CC NPs impregnated PEO + PVP:Li+ SPE films were found to result in enrichment of the ionic conductivity than PEO + PVP:Li+ SPE. The maximum obtained ionic conductivity is found to be 1.04 x 10(-4) S/cm at the optimised concentration 4 wt% of CC NPs in the composite at RT. 4 wt% CC NPs contained PEO + PVP:Li+ SPE film display superior performance in terms of cell specifications. These results explore the present 4 wt% CC NPs impregnated PEO + PVP:Li+ electrolyte could be suggested as promising candidate for solid state electrochemical device applications.