World’s first five-year stationary battery with no degradation

World’s first five-year stationary battery with no degradation

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By Nick Flaherty

CATL is China has launched the world’s first mass-producible energy storage system with zero degradation in the first five years of use.

The TENER containerised 6.25 MWh stationary storage battery system uses CATL’s lithium iron phosphate (LFP) cells.

While preventing the degradation of capacity over the first five years of use is a significant advancement in increasing the lifespan of batteries, the zero degradation of power is also important for energy storage power plants aiming to meet the requirements of new electric power systems.

The battery cells uses CATL’s biomimetic SEI (solid electrolyte interphase) and self-assembled electrolyte technologies to remove the roadblocks to the movement of lithium ions that build up over time and so achieve the zero degradation for both power and capacity throughout full life cycle.

TENER achieves an impressive 6.25 MWh capacity in the TEU container, representing a 30% increase in energy density per unit area and a 20% reduction in the overall station footprint. This boosts energy density to 430Wh/l for applications with limited space. 

CATL had to set up a dedicated, end-to-end quality management system that includes technology development, proof testing, operation monitoring, and safety failure analysis. It also built a validation platform to simulate the safety test of energy storage systems in different power grid scenarios.

After the project is put into operation, CATL continuously monitors its operation status through AI-powered risk monitoring and intelligent early warning, calculates the failure rate of energy storage products throughout their life cycle, and thus verify the safety design goals and continue optimizing them.


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