Heat travels through a plate.
+ Established circuit. Broad supplier ecosystem.
− Indirect thermal contact; seals and plate contact need attention.
ROCAS / BESS TECHNOLOGY
Upgrade the way you cool.
Direct cooling. Stronger thermal control. Better lifecycle potential. Discover what dielectric immersion can bring to your next BESS investment.
Cooling reaches the cell surface.
+ Direct heat pickup. Broad contact supports thermal uniformity.
− Fluid compatibility, circulation and condition must be managed.
AI-generated concept renderings; illustrative architecture, not product photographs.
Technical comparison
The difference starts at the cell.
| Design decision | Traditional liquid cooling | ROCAS dielectric immersion |
|---|---|---|
| Heat transfer | Cell → interface → plate → coolant. | Cell surface → dielectric fluid. |
| Temperature uniformity | Depends on plate contact and flow distribution. | Broad fluid contact supports more uniform temperatures. |
| Hot spots | Heat must travel to the cooled contact area. | Direct heat pickup helps manage local hot spots. |
| Electrical insulation | Coolant stays inside a sealed plate circuit. | Electrically insulating fluid surrounds the cells. |
| Fire protection | Plate heat removal plus BMS and system protection. | Direct heat absorption can help limit propagation. |
| Service requirements | Coolant, pumps, seals, circuit integrity and plate contact. | Fluid condition, compatible seals, circulation and gas management. |
Illustrative 0.5C scenario
Make every cycle count.
Look beyond the purchase price. Compare capital over the operating life.
Initial CAPEX
EUR / MWh
+17.6%Cycle-life assumption
Equivalent full cycles
+71.4%Capital per cycle
EUR / initial MWh / EFC
−31.4%Illustrative assumptions, not guaranteed product performance. CAPEX / EFC: 170,000 / 7,000 = 24.29; 200,000 / 12,000 = 16.67. Comparable qualification and equal scope assumed. Excludes energy, losses, OPEX, augmentation and discounting; this is not full LCOS. Actual life depends on duty cycle, calendar ageing and end-of-life criteria.
ROCAS ENERGY / FILM
See the technology in action.
Video hosted on Google Drive. Open video in a new tab ↗
Safety & business continuity
Fire risk is an investment risk.
A fire can damage assets, stop dispatch and disrupt the site. Evaluate protection before you buy.
26–27 August 2026
Stâlpu, Romania
A battery-storage hall fire required a difficult, prolonged intervention. IGSU did not establish the cause in this release.
Incident report ↗DSU / IGSU
7 May 2026
Czajków, Poland
A container battery fire prompted continued cooling, thermal monitoring and evacuation of nearby people.
Incident report ↗PSP Poznań
30 July 2021
Victoria Big Battery
Fire spread to a neighbouring Megapack during commissioning. Investigators identified a probable coolant leak and electrical faults.
Incident report ↗FRV / ABC; FEI / ESRGReal incidents illustrate BESS fire exposure, not a controlled comparison of cooling methods. Cooling configurations at Stâlpu and Czajków are not established here. Immersion does not guarantee zero fire risk. Images and credits from the supplied ROCAS safety presentation.
Cell-level thermal control
Direct fluid contact helps remove heat and manage hot spots.
Layered protection
Combine immersion with BMS, detection, gas management and fire protection.
System-level validation
Select tested configurations, documented operating limits and a defined maintenance plan.
Your next BESS starts with a better comparison.
Discuss the right architecture for your power, capacity and operating strategy.