ENERGY STORAGE SYSTEM USING LEAD-ACID BATTERY, AND CHARGING/DISCHARGING METHOD OF LEAD-ACID BATTERY

摘要

The present invention relates to an energy storage system using a lead-acid battery, and a charging/discharging method of the lead-acid battery. The energy storage system according to the present invention is characterized by comprising: a lead-acid battery; a power converter for charging the lead-acid battery by rectifying external power, and for converting DC power, discharged from the lead-acid battery, into AC power and then supplying to a lead; and a control unit for controlling the power converter in such a manner that the waveform of discharging current of the lead-acid battery has a pulse wave type having no "0" intervals when operating in a discharge mode for discharging the lead-acid battery. Accordingly, application in equipment for constant power supply is possible without "0" current intervals while increasing the lifespan and discharging efficiency of the lead-acid battery, and recovery of the lead-acid battery is possible while utilizing the lead-acid battery in an energy storage system.