PRELIMINARY PLANNING OF A SODIUM-SULFUR CHEMICAL BATTERY (NAS) AUTOMATED DISASSEMBLY PILOT PLANT - ACTIVITY 1: PRELIMINARY DESIGN OF DISASSEMBLY OPERATIONS

In this report all the data on NAS cells, modules and packs are collected and critically analyzed to derive a proper disassembly procedure. Both literature studies and shared information of NGK allow to conduct a detailed product analysis, verified and enriched by the direct interaction with inert samples, Sodium-free. Experimental tests were performed to extract significant information on the structure, dimensions and composition of cells to preliminary design the process and the necessary tools, according to the adhesion forces among different layers. Technical and safety issues have been identified and addressed in view of an automation of the line, able to decrease operating times and costs and to increase the efficiency of the process. Along with the definition of the optimal procedure, two different scenarios of the system have been drafted, analyzing pros and cons in terms of operating parameters, process flexibility, supporting devices, etc. The results here described will be validated and quantitatively analyzed in the subsequent Activity 2, when the disassembly procedure will be replicated on discharged and partially charged batteries, adapting and adjusting the sequence of steps and the identified tools to the variability induced by different post-use conditions.