7.5MW15MWh Liquid-Cooled Energy Storage System Design

This document details the design of a 7.5MW/15MWh liquid-cooled energy storage project using 3.2V/314Ah lithium iron phosphate cells. The system comprises three 2.5MW/5MWh units, each including a battery container and a converter step-up integrated machine. The battery container houses 12 battery clusters, a temperature control system, fire protection, and monitoring equipment, while the step-up unit integrates PCS and a transformer to connect to a 35kV grid. Key features include high energy density, 1500V DC design for efficiency, liquid cooling for battery longevity, and comprehensive safety measures such as PACK-level fire suppression and separate compartments for batteries and electrical components. The modular, containerized design facilitates installation, maintenance, and expansion, making it suitable for various grid applications. The system achieves 0.5Cp charge/discharge power and operates within -20°C to 55°C, with total harmonic distortion below 5% and power factor adjustable from -1 to 1.