TotalEnergies, pioneer in immersion cooling
TotalEnergies is a major player, recognized for the quality and performance of its products. In the field of immersioncooling, we are playing a pioneering role by demonstrating the benefits and performance of this technology in concreteapplications.
Concrete achievements
1) PHEV application — Conversion to immersion cooling of the Volvo XC90 PHEV
Objective: Adapt the thermal system without modifying the electrical, mechanical, and electronic architecture of thepowertrain.
Approach: Replacement of indirect cooling with an immersion solution compatible with the existing architecture.
Key results:
Cooling efficiency ×7 vs. indirect cooling.
8% reduction in cost and 6% reduction in pack weight.
Enhanced safety: no fire and no thermal runaway propagation after > 7 hours of thermal exposure (demonstrationtests).
2) EV application — Renault Mégane E-Tech battery in immersive version
Objective: Improve performance, efficiency, and safety in real-world conditions.
Approach: Switching the battery to immersion cooling.
Key results:
+5% energy density, –10% battery volume.
Charging time ÷2 (from 0 → 80% SOC).
Cooling system energy consumption ÷8.
+6% range.
Control of thermal runaway propagation without fire.
Improved durability (more uniform aging).
3) Complete battery swapping ecosystem for electric scooters
Objective: Develop a high-performance, safe immersion cooling-compatible submerged battery pack and chargingstation.
Approach: Joint design of pack + station (thermal, safety, charge cycle).
Key results:
Ultra-fast charging: 80% SOC in < 23 min.
Controlled safety: no fire or propagation after cell failure (tests).
+9% system energy efficiency.
Demonstrated compatibility of swapping with immersion.
How immersion changes the game
The development of immersion-cooled batteries is a game changer:
Through benchmark performance and safety levels (faster charging, sustained power, better thermal uniformity,propagation mitigation).
Through a new design approach (specific engineering rules: fluid architecture, material compatibility, venting, sensors,operational safety).
Our support
Beyond supplying dielectric fluids adapted to each use case, TotalEnergies can support your immersion batterydevelopments, from concept to deployment:
Thermal & system co-design
Functional safety & venting
Material compatibility & qualification
Prototyping and testing
Industrialization.