Ambient heating and cooling reduce the efficiency of any battery, but Ecoult’s innovative thermally optimized racking system reduces this effect and eliminates it altogether where possible.
Our medium-scale products, UltraFlex and UltraMax, comprise batteries racked with variable airflow gaps between them – tighter at the base and looser at the top where the stack is naturally warmer. The racking itself is designed to passively draw airflow between the individual UltraBattery cells and channel it through vents at the back of the rack.
This system, developed using computational fluid-dynamics modelling, optimizes airflow to increase convection cooling in hotter ambient conditions and reduce it in cooler conditions.
Efficiency in hot climate conditions
Our unique thermally optimized racking system was developed with the assistance of the Australian Renewable Energy Agency (ARENA), under its Emerging Renewables Program.
Testing by CSIRO, confirmed in our own laboratories and on live client sites, shows that our racking system keeps battery strings within our target range of a 3° C spread between cells – even in high-power applications – without the significant drag on efficiency usually caused by air-conditioning.
This offers a particular advantage in hot-climate operations. Australia, the US, Africa, India and South-east Asia all have regions of high temperature that are either heavily dependent on diesel or serviced by weak grids. Our racking system ensures high performance even under these conditions.
Ecoult’s next-generation energy-storage products are providing high-efficiency solutions around the world.
The racking is just the start
We are currently working on high-temperature battery variants and algorithms to expand our existing generous temperature range even further.
In all battery systems, degradation is a function of voltage and temperature. Where high voltage and high temperature exist together, degradation is increased.
UltraBattery spends most of its time at voltages lower than typical float voltages. We are now using our unique operating parameters to rewrite the book on battery temperature management.
Currently UltraBattery can avoid high voltage during periods of high temperature while continuing to work at a lower voltage range. If a critical load requires it, we can design rules to accept a degree of accelerated degradation or to switch on the air-conditioning (or a generator) under certain circumstances.
This provides you, the user, with control of a quantifiable cost–benefit decision: if it’s critical to run the load, you can compare the cost of diesel and/or air-conditioning with the cost of marginally increased battery degradation and make the appropriate decision.