Building on its success in mass-producing large-capacity battery cells, China’s EVE Energy has reached a new industry milestone. It announced on Tuesday that the world’s first 100 MWh-class battery energy storage facility using 628 Ah ultra-large battery cells has entered operation.
The 200 MW/400 MWh Ruite New Energy Lingshou project features 80 Mr. Giant energy storage systems and 40 integrated converter cabins. Its cell design incorporates an innovative stacking process and high-toughness separators, enhancing safety while optimizing the levelized cost of storage (LCOS).
Mass production of these large-capacity cells began in December 2024, making EVE Energy the first manufacturer to make lithium iron phosphate (LFP) battery cells exceeding 600 Ah for stationary storage. Cumulative production has now surpassed one million cells, demonstrating both manufacturing scale and product maturity.
The cells are part of EVE Energy’s Mr. Flagship series designed for battery energy storage system applications. The 628 Ah Mr. Big cell is integrated into the Mr. Giant system – a 20-foot containerised unit with up to 5 MWh energy storage capacity and suitable for 4+ hour long-duration storage.
However, EVE’s Mr. Big is not the largest cell announced to date. For instance, Chinese manufacturer Hithium showcased the industry’s first LFP battery cell breaking the 1000 Ah barrier last year. Their MIC 1130Ah cell is designed for long-duration storage of four to eight hours.
More recently, BYD relased a new battery energy storage system with the world’s largest single-unit capacity of 14.5 MWh. Named HaoHan, the system uses BYD’s self-developed 2,710 Ah Blade Battery cell, which the company claims is the largest energy storage cell in the world.
While 300 Ah+ products remain the industry standard, there are multiple reasons behind the move to even larger capacity cells. Using prismatic LFP cells with double the capacity effectively halves the number of cells, connection points and overall system components. According to many manufacturers, this leads to significant improvements in performance and maintenance efficiency and lower cost – primarily due to increased energy density per square meter.
On the downside, failures in larger cells have a greater impact on the system level, and thermal management becomes more challenging because larger cells emit more heat during charge and discharge cycles, making it harder to maintain uniform temperature.
EVE Energy is already shipping the Mr. Giant system equipped with 628 Ah cells overseas, completing its first shipments to Australia and Europe on September 10.
Announcing the completion of the Ruite New Energy Lingshou project, EVE Energy also revealed a 10 GWh strategic agreement with Guowang Technology, marking a shift to a long-term partnership. Further details of the supply deal were not disclosed.
