Ajouter videos essai abusif mosule air. Fluide Classique +cell-shield?
Although immersion cooling is known to limit the spread of thermal runaway and reduce the risk of fire, it should be rememberedthat dielectric fluids are, by nature, combustible. A rigorous functional safety approach must therefore be applied to all aspectsof immersed battery development: design, integration, validation, and operation.
During thermal runaway in a cell, a large amount of flammable gas is emitted. Regardless of the battery system, a venting circuitis provided to evacuate these gases to an area free of ignition sources, thus limiting the risk of fire.
When submerged, the principle remains the same. However, under the effect of extreme temperatures, the venting gases cancarry away a fraction of the vaporized dielectric fluid. For many conventional dielectric fluids, the auto-ignition temperature isrelatively low, creating a risk of auto-ignition in the venting plume.
To cover this risk, which is intrinsically linked to the design of the pack and the characteristics of the cells, Cell-Shield wasdeveloped:
Very high auto-ignition temperature: the risk of self-ignition of entrained vapors is greatly reduced.
Boiling point lower than the auto-ignition temperature: in extreme conditions, the change of state (liquid → gas) absorbs asignificant amount of heat (additional cooling) before reaching the auto-ignition threshold.
Halogen- and fluorine-free formulation with very low viscosity: improves fluid maneuverability (pumping, cold starts),convection, and contributes to safer integration.
As a result, the choice of fluid for a given architecture is not just a matter of thermal performance: it is a safety parameter in itsown right, to be evaluated at the system level (chemistry and cell format, pack architecture, venting path, detection/isolation,regulatory compliance).