CATL-ATL joint venture specializing in residential, C&I, and data center energy storage. Uses proprietary Kunlun LFP cells with 15,000-cycle lifespan and pioneered mass-produced semi-solid-state LFP cells with 32 GWh annual production capacity.
Chinese Tier 1 LFP cell manufacturer listed on the Hong Kong Stock Exchange. Produces high-capacity LFP cells and containerized BESS for utility-scale energy storage with 100 GWh annual capacity.
World's largest BESS battery maker by shipped capacity, vertically integrated from LFP cells to containerised DC blocks. TENER claims zero degradation.
Canadian-Chinese solar and energy storage company with dedicated e-STORAGE subsidiary. Manufactures own LFP cells and utility-scale SolBank DC block systems.
Subsidiary of Hengxin Auto Group, ranked top 7 globally in ESS battery shipments. LFP cells (100–588Ah) and DC blocks up to 6.26 MWh. Datasheets available.
Tier 1 cell maker running the world's largest dedicated BESS factory at 60 GWh in Jingmen. LFP cells including the 628Ah Mr Big, plus DC block containers.
Top 4 global BESS integrator (Wood Mackenzie) and BloombergNEF Tier 1 manufacturer with 30+ GWh deployed across 300+ projects. Gen 8 Scalable Platform features proprietary 750Ah+ LFP cells in modular 10-foot units supporting 6-12+ MWh configurations with 440+ Wh/L energy density.
Chinese lithium mining and battery group with vertically integrated BESS division. Over 21 GWh deployed globally, offering LFP cells and containerized energy storage systems up to 10 MWh.
Chinese battery manufacturer listed on the Shenzhen Stock Exchange (300438) with 8 production bases and capacity exceeding 100 GWh. Produces LFP cells and utility-scale BESS systems.
Energy storage division of JinkoSolar and BNEF Tier 1 manufacturer, offering utility-scale and C&I battery energy storage systems built on in-house LFP cell technology. SunTera containers deliver up to 6.25 MWh per 20ft unit with 10,000+ cycle life.
Tier 1 battery maker and major BESS cell supplier, moving into LFP for utility storage alongside NMC. Gigafactories in Korea, Poland, the USA and China.
Vertically integrated energy storage company manufacturing LFP cells (280Ah to 783Ah solid-state) and containerized BESS up to 8.3 MWh per unit. Over 8 GWh installed globally across 40+ countries with 260+ safety certifications and pioneering solid-state battery technology.
Leading modular LFP battery system manufacturer for C&I and utility-scale BESS. Container-based L-series and PowerCube rack systems are deployed across European and APAC markets.
BloombergNEF Tier 1 energy storage manufacturer that expanded from solar into comprehensive BESS solutions through subsidiary SYL Battery. Offers vertically integrated products spanning LFP cells, modules, PCS, and containerized systems with 15 GWh+ annual production capacity.
Chengdu-based company listed on the Shanghai STAR Market that expanded into LFP energy storage battery production in 2022. Manufactures lithium battery cells and modules for residential and C&I energy storage applications with 196 patents.
French battery manufacturer and TotalEnergies subsidiary specializing in high-reliability BESS for industrial and grid applications. Intensium Max+ is their flagship utility-scale BESS container.
BloombergNEF Tier 1 energy storage manufacturer with vertically integrated LFP cell production (102Ah to 684Ah) and containerized BESS systems. NoahX 3.0 delivers 6.528 MWh per 20ft container with 15,000+ cycle life and AI-based active balancing.
The battery cell is the fundamental electrochemical unit in a battery energy storage system (BESS). Each cell stores and releases electrical energy through reversible chemical reactions — and its performance defines the capacity, lifespan, and safety of the entire storage system. For procurement, the battery cell is the most critical selection point: cell chemistry, form factor, capacity, and cycle life directly influence system sizing, degradation behavior, and total cost of ownership.
In utility-scale and C&I BESS, lithium iron phosphate (LFP) cells dominate due to their superior safety profile and cycle life — typically over 6,000 cycles. NMC (nickel manganese cobalt) cells offer higher energy density and are used where space is constrained. Newer developments include LMFP (lithium manganese iron phosphate) and sodium-ion chemistries entering commercialization.
Key Specifications
What to look for when evaluating battery cells
When shortlisting for a BESS project, these are the key technical specifications that EPC contractors, project developers, and system integrators typically evaluate:
Cell chemistry
LFP, NMC, LMFP, Sodium-ion
LFP dominates utility-scale BESS due to higher safety and longer cycle life. NMC offers higher energy density but is more susceptible to thermal runaway. LMFP and sodium-ion are emerging alternatives.
Cell format
Prismatic, Cylindrical, Pouch
Prismatic cells are the most common in utility-scale BESS — they offer high capacity per cell and straightforward pack integration. Cylindrical cells (e.g. 46xx) are increasingly used in modular designs.
Cell capacity
100 – 1,200 Ah
Higher cell capacity reduces cell count per system and simplifies assembly. The industry is moving toward 300+ Ah cells that lower system complexity and cost.
Cycle life
6,000 – 12,000+
Cycle life at 25°C, typically with 80% remaining capacity as end-of-life. Higher cycle counts enable more aggressive usage profiles and improve LCOS.
C-rate / P-rate
0.5C – 2C
C-rate determines maximum charge/discharge power relative to capacity. Higher C-rates enable revenue stacking (arbitrage + ancillary services) but increase degradation.
Certifications
UL 9540A, IEC 62619
UL 9540A (cell-level thermal runaway fire propagation test) and IEC 62619 (safety requirements for industrial lithium-ion batteries) are minimum requirements for most utility-scale projects.
FAQ
Frequently asked questions
What battery chemistry is most common in utility-scale BESS?
Lithium iron phosphate (LFP) is the dominant chemistry for utility-scale battery energy storage. LFP cells offer a superior safety profile (higher thermal runaway stability), longer cycle life (typically over 6,000 cycles), and lower cost per kilowatt-hour compared to NMC. While NMC offers higher energy density and is used where space is constrained, lower LFP costs and less stringent fire suppression requirements have shifted battery chemistry toward LFP in stationary storage.
What cell format is used in BESS projects?
Prismatic cells are the most common format in utility-scale and C&I BESS. They offer high capacity per cell (up to 560 Ah and beyond), efficient space utilization in modules and racks, and simpler thermal management compared to smaller form factors. Cylindrical cells (particularly 46xx formats) are increasingly used in modular storage designs. Pouch cells are less common in stationary storage but appear in some C&I applications.
How does cell capacity affect system design?
Higher cell capacities (e.g. 280 Ah, 314 Ah, 560 Ah) reduce the total number of cells in a system, which means fewer connections, BMS channels, and assembly steps. This lowers system complexity and reduces manufacturing and maintenance costs. The industry is moving toward larger cell formats, but procurement teams should also evaluate supply chain diversification, spare cell availability, and compatibility with existing BMS and rack designs.
What certifications do BESS battery cells need?
The two most commonly required certifications for BESS battery cells are UL 9540A (the test method for evaluating thermal runaway fire propagation in energy storage systems) and IEC 62619 (safety requirements for lithium-ion cells and batteries in industrial applications). Many projects also require UN 38.3 (transport testing) and IEC 62660-2 (reliability and abuse testing). Regional requirements vary — in the US, some off-takers also require UL 1973 (batteries for stationary applications).
