Electrical energy storage (EES) systems-Unit parameters and testing methods. Review of testing for battery energy storage systems (BESS) for the purpose of implementing repurpose and reuse batteries

This document provides an overview of testing methodologies specifically designed for battery energy storage systems. The primary focus is on facilitating the evaluation of cells and modules to determine their suitability for second-life applications and recycling processes. It outlines essential parameters for characterizing the performance and safety of these storage units during their initial deployment and subsequent stages of life. The text details procedures to assess degradation patterns and remaining capacity, which are critical for establishing the viability of repurposing these batteries in less demanding applications. By standardizing the assessment criteria, this technical report supports the development of a circular economy for energy storage technologies. It serves as a reference for manufacturers and recyclers to ensure consistent and reliable data regarding the health of battery systems. The guidance helps identify safe pathways for transitioning used energy storage units from primary applications to secondary uses, thereby contributing to resource efficiency and sustainability goals in the energy sector.