Liquid-cooled battery energy storage system (BESS) to optimize energy costs, enhance power reliability, and support the facility’s sustainability goals.

System Configuration

Power Conversion System (PCS)
Rated AC output power: 2.5MW (2500kW);
Rated output voltage: AC 690V;
Step-up transformer: 690V to 10kV grid interconnection;
Modular design with high conversion efficiency;
Grid-forming capability for enhanced grid stability.

Battery Energy Storage Container
Capacity: 5MWh per 20-foot standard container;
Battery type: High-quality LFP (Lithium Iron Phosphate) cells;
Cooling method: Advanced liquid cooling system;
DC voltage: 1500V platform;
Integrated BMS (Battery Management System), thermal management, fire suppression, and control systems.

System Integration
The entire system features an all-in-one design with the battery (5MWh), PCS (2.5MW), liquid-cooling thermal management, safety systems, and control systems.

Key Technical Advantages

Advanced Liquid Cooling Technology
Unlike traditional air-cooled solutions, the liquid cooling system delivers superior thermal management with cell temperature differentials maintained within ±2.5°C. This precision cooling extends battery cycle life, enhances discharge capacity, and reduces auxiliary power consumption through intelligent thermal regulation. The system maintains round-trip efficiency above 94% even under demanding operating conditions.

High Energy Density & Compact Footprint
The 20-foot containerized design achieves 5MWh storage capacity in a single unit—a significant advancement over industry-standard 3-4MWh products. This high-density configuration reduces land requirements and civil construction costs while enabling flexible deployment in space-constrained industrial environments.

Modular & Scalable Architecture
The system employs a modular PCS design with 12 units of 250kW string PCS integrated into a 2.5MW converter-step-up integrated unit. This modular approach enables precise battery cluster management, improved power conversion efficiency, and simplified maintenance—individual modules can be serviced without system-wide shutdown.

Intelligent Energy Management
The integrated EMS (Energy Management System) optimizes charge/discharge strategies based on real-time electricity pricing, production schedules, and grid conditions. The system supports multiple operational modes including peak shaving, valley filling, frequency regulation, and backup power.

Operational Strategy & Economic Benefits
The facility operates the energy storage system on a “two-charge, two-discharge” daily cycle, storing energy during off-peak hours when electricity tariffs are lowest and discharging during peak demand periods when rates are highest.

Economic Impact
Significant reduction in peak-hour electricity procurement costs;
Reduced dependence on external grid during high-demand periods;
Hedging against international energy price volatility;
Enhanced operational resilience and business continuity.

Safety & Reliability Features
The system incorporates multiple layers of safety protection:
Cell-level monitoring: Real-time temperature and voltage tracking for each cell
Pack-level fire suppression: Perfluorohexanone (fluorinated ketone) fire extinguishing system with multi-stage fusing
Container-level protection: IP54/IP55-rated enclosures safeguarding against environmental factors
Intelligent warning system: Cloud-based analytics platform providing early fault detection and predictive maintenance alerts
International certifications: Compliant with IEC, UL, and VDE standards for global grid interconnection

Results & Conclusion
Economic return: Projected payback period of under 4 years based on tariff arbitrage savings