SUBTERRANEAN BATTERY ENERGY STORAGE SYSTEMS FOR GRID STORAGE: THERMAL MODELING AND EXPERIMENTAL VALIDATION

Abstract

The deployment of stationary BESS continues to grow as renewable energy systems are integrated into the electricity grid. Research on battery systems covering areas of system optimization, battery management system, grid integration of BESS, etc., have transformed the pattern of energy use and storage resulting in more energy efficient and sustainable energy systems. This thesis explores the thermal dynamics of subterranean battery energy storage systems for residential applications. Residential battery installations have brought up concerns surrounding safety, pollution, and structural footprint, which could hinder a widespread adoption of stationary battery storage systems for increased electrification. Burying batteries underground addresses these concerns. While previous research has focused above-ground battery installations, this study explores the potential of utilizing the ground as an infinite heat sink or storage for thermal management. The impact of soil temperatures, battery geometry and soil thermal properties on battery performance are analyzed through thermal modelling and laboratory experiments.