CNAEPower officially releases the world’s first 588Ah sodium-ion battery cell

2026-01-31 | Calvin

CNAEPower has officially launched its next-generation sodium-ion battery product, the CNAE 588Ah sodium-ion battery cell, to the global market.

Battery cell capacity enhancement is one of the core engines driving large-scale and high-quality development in energy storage. With the iteration of battery cells from 280Ah to 314Ah, the market is now embracing the next generation of 500Ah+ battery cells. "Large capacity" has become the undisputed evolutionary direction for the next-generation battery cells.

Five Key Advantages of Sodium-Ion Batteries: Solid Development Strength

The high safety, wide temperature range, ultra-fast charging, long lifespan, and low cost of sodium-ion batteries highlight their strong development potential. With lithium resources becoming increasingly scarce, 70% of materials are dependent on imports, while sodium salts are abundant, allowing sodium-ion batteries to achieve self-sufficiency in raw materials, offering a clear cost advantage. The easy recyclability significantly reduces resource dependency and environmental pressure, promoting the sustainable development of green energy.

With a working temperature range of -40°C to 80°C, sodium-ion batteries can adapt to more extreme application scenarios. The stable raw materials of sodium-ion batteries ensure their inherent high safety, preventing thermal runaway, fires, and explosions. Coupled with ultra-fast charging and long cycle life, these batteries can provide safe, reliable, and efficient solutions for various applications.

588Ah Large Capacity Sodium-Ion Battery: Technological Breakthroughs

• 1. Cation Substitution Strategy: The strategy of replacing cations such as V3+, Cr3+, and Ti3+ inhibits the Na/Fe mixing, improving the redox reaction activity and structural stability. The developed high-capacity polyanion-type cathode material has a reversible specific capacity of 105 mAh/g, and the 588Ah cell achieves an energy density of over 165 Wh/kg.
• 2. High Voltage Compatibility: A fluorinated high-pressure solvent system and silane-based electrolyte additives were developed to ensure compatibility between the electrode and electrolyte interface under high voltage. This allows the large capacity sodium-ion battery to operate safely at a 4.1V working voltage with over 10,000 cycles, ensuring stable performance under high voltage.

Process Optimization and Energy Storage System for the Na⁺ 588Ah Large Battery Cell

• 1. From "Perfect Electrodes" to "Eternal Welding": The precise coating technology with adaptive flow field and collaborative calendaring process ensures uniform performance across the 300+ layers of the electrode. Additionally, our self-developed light-force-spectroscopy real-time collaborative welding technology guarantees accurate and secure welding of the entire electrode tab.
• 2. Smart Thermal Balancing System Based on Electro-thermal-mechanical Coupling: The 588Ah large capacity generates higher heat, so we applied non-uniform thermal conductivity material distribution technology to form efficient heat transfer paths inside the battery cell. With the use of a comprehensive thermal field coupling simulation model, we can accurately simulate and optimize the dynamic balance between heat generation and dissipation at the design stage.
• 3. Prestressed Adaptive Shell Structure: We pioneered a heterogeneous material gradient composite technology and designed a stress-buffering zone. Essentially, we placed innovative materials and buffering structures at key stress points to absorb and disperse stress, allowing the expansion force to "soft land" within the shell.

5MWh Pure Sodium Battery Energy Storage System Solution

The 588Ah battery technology addresses the issues of low energy density, long heat dissipation paths, and slow heat conduction seen in traditional sodium-ion batteries. The energy storage system can adopt an air-cooling system design, with a service life matching that of lithium iron phosphate liquid cooling systems. The air-cooling system has a simpler overall structure, is easier to maintain, and costs 20% less than liquid cooling systems.

Embracing the Era of Large Capacity, Defining the New Era of Sodium-Ion Batteries

The breakthrough from traditional sodium-ion batteries to 500+Ah large capacity cells marks the transformation of sodium-ion batteries from an "alternative solution" into a "game-changer" that can redefine cost-effectiveness and feasibility in specific sectors. This is ushering in a new era where sodium-ion and lithium-ion batteries coexist and complement each other, with battery technologies being chosen based on specific application scenarios.

With the release of production capacity, cost reduction, and application validation, 2026 will mark the true starting point for the large-scale commercial application of sodium-ion batteries. We believe that, driven by policies, markets, and technology, sodium-ion batteries will open a new era of global energy storage.