As ultra-large-format cells become increasingly common in commercial-scale energy storage, the high currents required for cell activation are creating new operating conditions for formation and aging systems: sustained high-power operation over extended periods. Thermal runaway, high energy consumption and system-level safety are emerging as critical challenges in the formation and aging of large-format energy storage cells.
As energy storage cells move from 500 Ah and 700 Ah toward capacities of 1,000 Ah and beyond, the high power demands and intense heat generation associated with ultra-high operating currents are making 1,000 A-class charge/discharge capability per channel an increasingly common requirement. Formation and aging systems are consequently facing a new set of operating conditions characterized by concentrated energy loads and high heat generation. This is no longer simply a matter of scaling up system specifications. It calls for a fundamental redesign across the power architecture, thermal management, mechanical structure and process software.
Precision Thermal Management Across the System
Under 1,000 A-class operating currents, localized overheating becomes one of the most significant safety risks. LEAD’s formation and aging systems take a system-wide approach to thermal management, with the goal of maintaining uniform temperature and stable operating conditions across the entire process.
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Air-bag pressurization for uniform force distribution
Flexible air-bag pressure provides more uniform mechanical loading across the cell, reducing the risk of uneven SEI formation during the formation process.
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Tight chamber temperature control at ±2°C
The capacity grading section uses a high-precision liquid-cooling temperature control system to maintain chamber temperature uniformity within ±2 °C, helping ensure consistent thermal conditions across an entire batch of cells.
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Stable power module temperature under sustained load
The power architecture has been extensively optimized to maintain stable operating temperature during prolonged operation under high loads and high currents, supporting reliable equipment operation for continuous production.
System-Wide Energy Management for Lower Manufacturing Costs
Formation and capacity grading can account for around 30% of total energy consumption across lithium-ion battery manufacturing. For cell manufacturers, energy efficiency directly affects production economics. LEAD therefore addresses energy consumption at the system-architecture level.
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Compact architecture to reduce line energy consumption
Multi-stage cooling is combined with a compact equipment architecture to shorten high-current paths. This reduces electrical losses while cutting the production line footprint by more than 20%, with corresponding reductions in the energy required for factory environmental control.
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Negative-pressure electrolyte retention to reduce material loss
Proportional-valve control enables continuously adjustable negative pressure, allowing gases generated inside the cell to be removed efficiently while minimizing electrolyte loss during formation. This reduces material consumption as well as operating and maintenance costs.
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Platform-based power architecture to improve conversion efficiency
A modular, platform-based power architecture keeps the system operating within its optimal efficiency range. This reduces energy conversion losses under high-current conditions and supports lower unit costs in high-volume production.
Closed-Loop Safety Management for High-Volume Production
Safety is fundamental to lithium-ion battery manufacturing. LEAD’s design philosophy combines safety as the baseline, thermal management as a key control measure and energy management as a system constraint. From preventing risks at their source to precision screening during production and efficient maintenance throughout operation, the system establishes a closed-loop approach to production safety.
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Controlling cell deformation at the source
Precise pressure control across multiple process steps effectively limits cell expansion and deformation, preventing process defects such as electrode misalignment and separator wrinkling during formation. This helps mitigate risks including lithium plating and significantly shortened cycle life, while reducing the potential for thermal runaway.
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Precision capacity grading for better cell consistency
High-precision capacity grading identifies performance differences between cells and improves overall cell-to-cell consistency. By screening out underperforming cells before pack assembly, the system helps prevent the “weakest-link” effect and reduces the risk of overcharge or over-discharge at the pack level.
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Easy maintenance for reliable operation
For ultra-high-current applications of 300–600 A in formation and 400–1,000 A in capacity grading, LEAD has developed a dedicated, platform-based power cabinet architecture. The upgraded design improves module stability and reliability while incorporating an easy-access pull-out design, balancing production safety with maintenance efficiency.
Measurable Production Gains for Next-Generation Energy Storage
Technology ultimately matters when it delivers measurable value to manufacturers. LEAD’s latest integrated formation and capacity grading solution for large-format energy storage cells has delivered significant improvements across key production metrics:
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Higher efficiency
Charging and discharging efficiency of the power system and overall system improved by 2%+
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Lower energy consumption
Overall line operating energy consumption reduced by 12%+
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Smaller footprint
System footprint reduced by 20%+, with lower energy consumption for associated factory infrastructure
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Faster ramp-up
Production ramp-up time shortened by 30%
The shift toward larger-format energy storage cells is becoming a defining trend in the development of higher-quality, more cost-efficient energy storage manufacturing. As the final core process in cell manufacturing, formation and capacity grading plays a decisive role in determining cell quality, cost and safety margins.
As manufacturers face a new generation of challenges in high-volume production, LEAD is moving beyond incremental increases in current ratings and other specifications. Instead, it is redesigning the manufacturing system around thermal management, energy efficiency and safety, establishing a new approach to large-format cell production. Through these three areas of technological advancement, LEAD is addressing the core challenges of 1,000 A-class high-current formation and capacity grading at scale, helping manufacturers move toward safer, more efficient and more cost-effective production.
