The core equipment of lithium-ion battery energy storage stations is containers composed of thousands of batteries in series and parallel. Accurately estimating the state of charge (SOC) of batteries is of great significance for improving battery utilization and ensuring system operation safety. This article establishes a 2-RC battery model.
When exploring optimization strategies for lithium-ion battery charging, it is crucial to thoroughly consider various factors related to battery application characteristics, including temperature management, charging efficiency, energy consumption control, and charging capacity, which are pivotal aspects.
Notably, actual energy storage containers hold thousands of lithium-ion battery cells, and their power and capacity far exceed those of electric vehicles or individual battery boxes.
Deep discharge can also lead to battery failure. An ideal lithium-ion battery charger should have voltage and current stabilization as well as a balancing system for battery banks. The voltage of a fully charged lithium-ion cell is 4.2 Volts. Once the bank reaches this voltage, charging should stop.
Among several battery technologies, lithium-ion batteries (LIBs) exhibit high energy efficiency, long cycle life, and relatively high energy density. In this perspective, the properties of LIBs, including their operation mechanism, battery design and construction, and advantages and disadvantages, have been analyzed in detail.
To study the changes in the SOC values during the charging and discharging processes of the energy storage power plant within a cycle, HPPC operating data at different charging and discharging current rates of the battery are selected as the source of the SOC estimation data for lithium-ion batteries.