Refresh Charging in Stationary Energy-Storage Systems with VRLA and Flooded Lead-Acid Batteries

摘要

The current trend of a more and more fluctuating energy production leads to the question of efficient energy storage. Existing uninterruptible power supply (UPS) systems can be a quick, economic and efficient solution for services, such as peak shaving and load levelling. The resulting cycles with lower state of charge (SoC) will make new charging strategies necessary that allow efficient full charges in short periods. The developed 3D model does allow an in-depth analysis of ageing influencing parameters. This model approach can help to accelerate the research on optimized charging procedures. The following paper presents the first validation steps and analysis of simulations with traditional refresh charging methods as well as the influence of charge voltage limits on important cell parameters. With an increase of the charge voltage from 2.45 V to 2.67 V water loss more than doubled through a 24 hThe first analysis does suggest high voltage charges as an efficient and easy measure for equalization charges, if water losses can be controlled or compensated for.