With the continuous development of the social economy, energy storage technology is playing an increasingly vital role in smart grids. Depending on the application scenario, energy storage can be categorized into three sectors: the generation side, the grid side, and the user side (including commercial, industrial, and residential applications).
In recent years, the rapid growth of renewable energy and the transformation of new power systems have greatly increased the demand for energy storage, revealing enormous market potential. To align with this fast-evolving market and meet the needs of industry customers, CEEG has successively developed a series of supporting energy storage products, including dry-type transformers for energy storage, oil-immersed transformers for energy storage, all-in-one energy storage and boost converter system, and combiner cabinets, while also providing energy storage system integration services.
1. Project Overview
Walking with giants and keeping pace with the world! CEEG continues to deeply cultivate the energy storage field, advancing with independent innovation. The company’s latest achievement—the 4.474 MWh liquid-cooled battery container—has successfully passed all factory tests and rolled off the production line!
2. Project Challenges
（1） Testing Platform Development
A self-developed high-voltage testing platform dedicated to energy storage was created, enabling full-power charge and discharge testing on both the AC and DC sides.
（2） Liquid-Cooled Energy Storage System
For the first time, a single container-based liquid-cooled energy storage system was designed with an energy density of 4.474 MWh.
（3） Liquid-Cooled PACK
Each battery container is equipped with over a hundred 1P52S liquid-cooled PACKs.
（4） Extreme Weight
Each 30-foot battery container weighs up to 50 tons.
During on-site installation, the container had to be lifted to a height of over 6 meters and horizontally moved nearly 40 meters—a process that posed significant challenges for lifting safety.
Adhering to the principle of “Safety First in Production,” the Complete Equipment Division specially designed a custom lifting rig capable of handling 80 tons for this project. To ensure absolute safety, the lifting equipment was officially certified by the Jiangsu Provincial Quality Supervision and Inspection Center for Special Safety Protection Products before being put into use.
In addition, to guarantee successful on-site grid connection and truly realize a “turnkey engineering solution,” the Complete Equipment Division built a dedicated 10 kV grid-connection testing platform in the factory. The AC and DC cables between the all-in-one energy storage and boost converter system and the battery container were fully connected, and the system successfully passed charge–discharge functional tests and all communication tests.
3. Project Achievements
This project marks an independently developed battery container production solution by CEEG. Its successful execution has greatly enriched CEEG’s experience in the design and manufacturing of industrial and commercial AC/DC energy storage projects. It has powerfully driven the company’s energy storage business development and further strengthened CEEG’s capability to deliver reliable and high-quality services to its customers.