The PTDKJ container energy storage system with air cooling is designed as a modular, transportable solution for large‑scale battery energy storage. Housed in a standard container enclosure, the system integrates lithium‑ion battery packs, power conversion equipment, battery management, thermal management, fire protection, and monitoring systems into a compact unit suitable for grid‑connected and behind‑the‑meter applications.At the core of the system are high‑energy‑density battery racks arranged for efficient use of space and ease of maintenance. Each rack is monitored by a battery management system that supervises cell voltage, current, temperature, and state of charge. This ensures safe operation, balanced performance across all modules, and extended cycle life. The system can be configured to deliver different power and energy ratings by adjusting the number of racks and containers deployed in parallel.The air‑cooling subsystem is a key feature of this design. It uses forced‑air circulation with high‑efficiency fans, air ducts, and optimized airflow paths to remove heat generated by the batteries and power electronics. Temperature sensors distributed throughout the container feed data into the control system, which dynamically adjusts fan speed and ventilation patterns to maintain temperature within a safe and uniform range. This helps prevent thermal hotspots, reduces degradation, and enhances overall reliability.Compared with liquid‑cooled designs, the air‑cooled container system offers a simpler structure and lower maintenance requirements. There is no need for coolant pumps, piping, or heat exchangers, which reduces potential leak points and simplifies on‑site installation. The system is particularly suitable for regions with moderate ambient temperatures where effective air management can keep cell temperatures within recommended limits. Dust filters and protective grilles are employed to protect internal components and preserve airflow quality in outdoor environments.The container is engineered for outdoor deployment, featuring weatherproof construction, corrosion‑resistant materials, and robust insulation. It can be delivered as a pre‑assembled unit, minimizing on‑site work and speeding up project schedules. Standard interfaces for AC and DC connections, communication ports, and auxiliary power facilitate integration with inverters, transformers, and plant‑level control systems. The design supports remote monitoring and control via SCADA or energy management platforms, enabling operators to track performance, manage dispatch, and conduct predictive maintenance.For safety, the system incorporates multi‑level protection, including over‑voltage, under‑voltage, over‑current, and over‑temperature safeguards, as well as fault detection and alarm functions. Fire detection sensors and automatic suppression options can be configured according to project requirements and local codes. The result is an air‑cooled container energy storage system that balances safety, efficiency, and cost‑effectiveness, suitable for applications such as renewable energy smoothing, peak shaving, backup power, and microgrid support.