BAK Battery Unveils 688Ah Large-Capacity Energy Storage Cell, Achieving 8% System Cost Savings

As the energy storage industry shifts focus from rapid scale expansion to high-quality development, large-capacity battery cells have become the key direction for innovation. At the 17th Shenzhen International Battery Technology Exchange and Exhibition (CIBF 2025), BAK Battery launched its groundbreaking 688Ah large-capacity energy storage cell, boasting an energy density exceeding 435 Wh/L.

Significant Efficiency and Cost Advantages

The BAK 688Ah large single cell supports a system energy capacity of up to 6.9 MWh. Compared to standard 20-foot containers, it reduces component counts by 20% and system footprint by 20%, leading to an 8% reduction in overall system costs. This optimization not only lowers upfront investment but also enhances project feasibility through improved land use efficiency.

Industry-Leading Durability and Lifecycle

Designed for longevity, the cell offers a cycle life exceeding 12,000 cycles and a calendar life of over 20 years—matching the full lifespan of photovoltaic power stations. These characteristics translate to a more sustainable and cost-effective energy storage solution over the entire project lifecycle, delivering "cost reduction and efficiency improvement" for operators.

Advanced Safety and Stability

Safety remains paramount. The BAK 688Ah cell meets rigorous energy storage abuse tests, including overcharge, short circuit, thermal runaway, and minor penetration scenarios, without any explosion or fire incidents. Its excellent high-temperature stability further ensures reliable and safe operation under harsh conditions.

Innovation in Structure and Materials

To meet growing market demands for large-capacity cells, BAK Battery has innovated across multiple dimensions:

· Structural Design: The cell employs a mature wound laminated architecture, balancing high manufacturing efficiency with optimal performance. This design lowers internal impedance, controls temperature rise, and improves heat dissipation, ensuring consistent temperature distribution and enhanced safety.

· Materials: The cathode uses high-stability, high-density lithium iron phosphate(LiFePO4) material known for excellent cycling performance. The anode features long-life single-particle graphite material. Combined with a proprietary high-stability, long-cycle, high-temperature electrolyte and functional additives, the cell achieves a balanced enhancement in capacity, cycle life, rate capability, and safety.

Driving the Future of Energy Storage

At a pivotal moment in the global energy transition, energy storage is a core enabler of the new power system. With large-scale demand for high-capacity cells rising among energy storage integrators, BAK Battery is committed to continuous technological and product innovation to support the high-quality development of the energy storage industry in this new era.