EVE showcases 6.9 MWh storage system, targets Q3 scale-up

EVE Energy showcased its 6.9 MWh battery energy storage system (BESS) at the EESA Energy Storage Exhibition in Shanghai earlier in August. The product has entered small-batch pilot production with scaled manufacturing targeted for the third quarter of 2025. Initial annual production capacity is planned at 10 GWh, anchored by plants in Jingmen, Hubei and Huizhou.

The system adopts cell-to-pack (CTP) integration, eliminating traditional modules by integrating cells directly into the pack. EVE reports a 10% reduction in pack cost and a 20% increase in energy density per unit area. The unit is designed for standardized deployment in hundred-megawatt-hour projects and is rated to pair with mainstream 3,450 kW power blocks, aiming to lower upfront investment for large plants.

Thermal management shifts to a top-mounted liquid-cooling unit, which EVE says improves container space utilization by 15% while reducing footprint and operating noise. A modular liquid-cooling architecture allows each module to run independently, with the company claiming a 30% improvement in operations and maintenance efficiency.

Safety features are embeded from cell to system level. At the cell level, EVE applies its “The Seer” AI monitoring to track state of health across the life cycle and flag anomalies. At pack level, a “thermal–electrical separation” layout physically isolates high-voltage circuits from the thermal system to limit propagation risk. Fire protection combines passive and active measures, including perfluorohexanone suppression, forming what the company describes as a three-layer defense.

EVE positions the 6.9 MWh platform as a building block for flexible expansion into multi-tens-of-megawatt stations in China’s market-driven utility segment, while also targeting overseas commercial and industrial applications.

The product roadmap is tied to the firm’s large-format cells. EVE said its 628 Ah “Mr. Big” storage cell – among the first of its class in volume production – has obtained GB/T 36276-2023 certification from the China Electric Power Research Institute (CEPRI) and multiple other international certifications. The 628 Ah cell entered full mass production in the first quarter of 2025, and EVE is developing a next-generation cell with a capacity expected to exceed 700 Ah to support future upgrades of the 6.9 MWh system.

According to EVE’s earnings report for the first half of 2025, the operating revenue was achieved CNY 28.2bn, up 30.06% year on year, and net profit attributable to shareholders of CNY 1.605bn, down 24.9%. Energy-storage battery revenue reached CNY 10.298bn, up 32.47%, with shipments of 28.71 GWh, up 37.02%. The energy-storage battery gross margin was 12.03%, a year-on-year decline of 2.32 percentage points.