The Future of Energy Storage Lithium Batteries Belong to Stacking，Witness the “Golden Combination” of Short Blade Energy Storage Cells and Flying Stacking Technology
On September 12, SVOLT Chairman and CEO Yang Hongxin visited SVOLT’s energy storage manufacturing base—Chengdu plant. For the first time, he shared from a first-person perspective why SVOLT has chosen a “non-standard,” application-driven path for its energy storage products; why the L500 Short Blade energy storage cell has earned recognition from leading domestic and international energy storage integrators and project owners; and why the future of energy storage must belong to stacking—and why the stacking technology will evolve along the trajectory of thermal-composite process innovation.
Three Generations Under One Roof: Chengdu Base Now Hosts Three Generations of Short Blade Energy Storage Cells
During the plant tour, Yang introduced SVOLT’s three generations of Short Blade energy storage cells already deployed at the Chengdu base.
The Generation 1 product is 325Ah LFP Short Blade cell built on a stacking architecture, delivering a cycle life of 12,000+ cycles. The Generation 2 product is stacking Short Blade energy storage cell with higher energy density and lower cost, reaching 350Ah, enabling a standard 20’ energy storage container to achieve 6.9MWh ultra-high capacity. The Generation 3 product is 770Ah ultra-large-capacity energy storage cell, scheduled for mass production in Q2 2025 at the Chengdu base.
SVOLT’s one-time, three-generation product roadmap is built entirely on the company’s industry-first third-generation thermal-composite stacking technology, delivering clear advantages in energy density, safety, and cycles.
At present, SVOLT’s dedicated 325Ah L500 Short Blade energy storage cell has been deployed in GCL Group’s “Xinyu+” large-scale storage integration solution, enabling a standard 20-foot container to deliver up to 6MWh of storage capacity. More recently, CRRC Zhuzhou Institute and SVOLT signed a cooperation agreement on ultra-large-capacity energy storage cells. Going forward, SVOLT will supply CRRC Zhuzhou Institute’s CESS-4.0 energy storage system with a new generation of ultra-large-capacity stacking energy storage cells.
Process Innovation: Thermal-Composite Stacking Is the Optimal Solution for Energy Storage Cells
“Once a good product is developed, the key is how to manufacture it with consistently high quality.”
To ensure battery quality, SVOLT’s Chengdu 350Ah energy storage cell plant was designed in accordance with Lighthouse Factory standards—featuring high levels of intelligence, automation, and lights-out/highly unmanned operation, with production-line automation exceeding 95%.
During the plant tour, Yang noted that SVOLT’s energy storage plant has already realized unmanned production and introduced multi-process integrated manufacturing, taking the lead in achieving highly simplified production across the industry. “The benefits are lower investment, lower energy consumption, and therefore lower manufacturing cost,” he explained. “In addition, process integration reduces the frequencies that electrode plates move during production, improving both product quality and safety.”
On the product line, we can see the inbound/outbound process at the coating workshop is fully performed by AGVs, significantly improving logistics efficiency while eliminating manual contact to enhance electrode safety. The product line also features CCD real-time monitoring, providing 24/7 control of key parameters such as coating speed and areal density to ensure every electrode plate meets specifications.
SVOLT has also deployed 832 CCD cameras across the full process for defect detection, with more than 1,200 quality control points, enabling 100% in-process defect screening to prevent any nonconforming product from leaving the plant.
In the critical stacking step, SVOLT applies a globally pioneering thermal-composite Flying Stacking technology.
The thermal-composite stacking technology bonds the separator and anode together, addressing long-standing issues seen in traditional stacking—such as separator dusting and wrinkling. After thermal-composite treatment, electrode surfaces are smooth and uniform, and no tape is required.
Derived from SVOLT’s proven short blade technology for power batteries, the thermal-composite flying stacking technology tackles the industry’s persistent challenges of slow stacking speed and low yield. Across core metrics: safety, long life, and fast charging, it not only outperforms winding, but also delivers clear advantages versus other stacking approaches in the market.
After years of exploration, breakthroughs, large-scale manufacturing verification, and market feedback, SVOLT believes the future of stacking must be thermal-composite stacking.
Breaking Through Convention: Short Blade Energy Storage Cell is the Optional Solution for 20’ Energy Storage Container
Today, mainstream energy storage cells are still largely “borrowed” from commercial vehicle origins—typically 71×173 280Ah or 314Ah cells, and many cell makers continue to iterate on that legacy size.
“After intense internal debate and assessment, we still chose the path that is right—even if it’s difficult,” Yang said. Starting from the fundamentals of energy storage systems and real-world application scenarios, SVOLT pursued a forward-designed approach, concluding that future energy storage needs cells that deliver higher integration safety, higher grouping efficiency, and greater potential for sustained iteration and upgrades.
Based on the forward derivation across safety, system integration, grouping efficiency, and cost reduction, SVOLT believes the stacking-based L500 Short Blade energy storage cell (500mm x 215mm) is the optimal solution for 20’ energy storage container.
As a product designed specifically for energy storage scenarios, the L500 Short Blade energy storage cell offers advantages over today’s mainstream cells across cost, safety, and performance, while enabling greater value creation for customers.
Cost: The 350Ah L500 Short Blade energy storage cell bring a single 20’ container with 6.9MWh energy to life. Compared with today’s mainstream 5MWh containers, this innovation can reduce system cost by 5% and cut footprint by 28%, lowering both upfront capex and lifecycle levelized cost of energy storage
Safety: When processing longer electrode plate, the speed and tension control of traditional winding process become complex and less predictable. During discharge, stress concentration at rounded corners can be uneven, and winding structures are more prone to electrode wrinkling, it will raise risks such as lithium plating on the anode. Stacking technology avoids these inherent issues.
Performance: Beyond safety, the cycle life of energy storage cell is now a defining battleground because it determines full-lifecycle energy throughput.
With stacking technology, each layer uses a dedicated tab design, reducing internal resistance versus winding. The L-shaped short blade cell is thinner, with dual-side tab configuration that disperses thermal generation—delivering lower temperature rise and more uniform temperature distribution. The L-shaped structure also reduces thermal-generation power per cell, keeping peak temperature lower to further enhance cycle life.
The L500 short blade cell enables dual-layer liquid cooling (top and bottom). Compared with traditional 71×173 cell, the L500 short blade cell can reduce internal temperature delta by 8°C and improve cycle life by 10%.
Notably, thermal-composite’s unique edge-sealing design can also retain an additional 2% electrolyte, further extending cycle life.
With stacking architecture and thermal-composite process innovation, SVOLT’s energy storage cells deliver outstanding cycle performance and safety, and longer cycle life means higher full-lifecycle energy throughput, and greater returns for customers.
Energy storage cell evolution is fundamentally a logic of “Born with Larger Capacity”: larger cells drive lower cost and higher system integration efficiency. Stacking technology offers inherent advantages for large-capacity energy storage cell development. As a global leader in stacking technology and the originator of thermal-composite technology, SVOLT continues to lead the direction for large-capacity cell iteration and has earned strong recognition from leading integrators across the industry. As large-scale deliveries ramp up, SVOLT expects its market share in the global energy storage market to accelerate rapidly.
