Abstract: To investigate the impact of hydrogen concentration on the venting efficiency of explosion vent panels in energy storage applications, a gas explosion test bench was established. A series of hydrogen ignition experiments were conducted in a 1 m³ pressure vessel to evaluate venting performance under varying hydrogen volume fraction (13%, 15%, 19%, and 23%). The experimental results show that: The venting efficiency cannot achieve 100% due to the inherent mass of the vent panel, which requires overcoming inertial forces during activation. Venting efficiency exhibits an inverse correlation with hydrogen concentration, yielding values of 82.0%, 72.9%, 58.1%, and 51.9% for the tested concentrations, respectively.

Key words: explosion vent panels, venting efficiency, pressure vessels, explosions, energy storage systems