CORNEX Unveils Groundbreaking 688Ah Energy Storage Battery Cells: Pioneering the "Double-Six" Era

2025-06-01 | Calvin

CORNEX, in collaboration with CRRC Zhuzhou Locomotive, is proud to announce the successful production launch of its next-generation 688Ah energy storage battery (ES battery) cells. This milestone marks a significant leap forward in energy storage technology, ushering in the "double-six" era, where single-cell capacity exceeds 600Ah and system energy surpasses 6MWh.

A New Era in Energy Storage

The "double-six" era represents a transformative shift in the energy storage industry, driven by the need for higher capacity, greater efficiency, and enhanced safety. The CORNEX 688Ah ES battery cell is engineered to meet these demands, delivering unparalleled performance across multiple dimensions, including energy density, safety, efficiency, and cost-effectiveness.

Key Innovations and Features

1. High Density: Maximizing Energy in Minimal Space

The 688Ah ES battery cell features an innovative design with same-side tabs and a convex plate structure, optimizing space utilization and energy release. Utilizing advanced high-density, high-gram-capacity LFP materials and an optimized stacking process, the cell achieves remarkable energy density:

• - Gravimetric energy density: Nearly 200Wh/kg
• - Volumetric energy density: Exceeds 430Wh/L (an 8% improvement over previous generations)

This breakthrough enables more energy to be stored in a smaller footprint, making it ideal for space-constrained applications.

2. High Safety: Redefining Battery Reliability

Safety is at the core of the 688Ah ES battery cell's design. Key safety features include:

• - High-safety, highly infiltrative electrolytes
• - Double-sided ceramic separators for enhanced thermal stability
• - Over 50 CCDs and 3,000+ monitoring points on fully automated, intelligent production lines

Rigorous testing protocols, exceeding national standards, have validated the cell's performance in extreme conditions, including needle penetration and thermal runaway tests. This ensures intrinsic safety from design to deployment, guaranteeing stable operation for ultra-large capacity systems.

3. High Returns: Delivering Unmatched Economic Value

The 688Ah ES battery cell sets new benchmarks for economic performance:

• - Single-cell capacity: 2.2 kWh
• - Cycle life: 10,000 cycles
• - Lifespan: Over 20 years
• - Energy conversion efficiency: 95%

When integrated into a 20-foot container system, the 688Ah cells enable a system energy leap from 5MWh to 6.9MWh, reducing floor space requirements by 20%. This translates to lower upfront investments, reduced lifecycle costs, and significantly higher returns for power plant operators, making large-scale, low-cost energy storage a reality.

Driving the Future of Energy Storage

CORNEX is committed to pushing the boundaries of battery technology, delivering cutting-edge solutions that empower the global energy transition. The 688Ah ES battery cell, a testament to CORNEX's collaboration with CRRC Zhuzhou Locomotive, exemplifies this commitment. With its exceptional performance, safety, and reliability, the 688Ah cell accelerates the adoption of 6.9MWh systems, contributing to a more sustainable and resilient energy future.

In 2024, CORNEX continues to innovate, developing a diverse portfolio of large-capacity battery cells that address critical challenges in safety, cost, cycle life, and energy efficiency. Together with industry partners, CORNEX is shaping the future of energy storage, one breakthrough at a time.