68 September/October 2025 | E-Mobility Engineering specified in the standards. The most sophisticated workflows combine computational fluid dynamics for thermal analysis with structural simulations to evaluate mechanical integrity. These virtual verification frameworks allow designers to explore multiple protection strategies before committing to physical prototypes, significantly reducing compliance certification costs. The regulatory push has particularly impacted thermal runaway prevention methodologies. Where early standards focused primarily on electrical safety, newer iterations such as GB38031-2025 demand complete prevention of fires or explosions – a requirement that favours immersion cooling solutions with their proven ability to contain thermal events. This has accelerated development of dielectric fluids that combine excellent heat transfer with intrinsic electrical insulation properties, creating systems that address both performance and safety requirements simultaneously. Condensation considerations While modern battery systems predominantly use liquid cooling, condensation remains a critical design consideration – particularly for applications where air exposure cannot be completely avoided. In humid environments, uncontrolled moisture accumulation can lead to electrical shorts, corrosion and reduced thermal performance. Traditional air-cooled systems faced these challenges acutely, requiring active dehumidification strategies that often compromised energy efficiency. Contemporary liquid-cooled systems address moisture intrusion through multiple barriers. Sealed enclosures with IP67 or higher ratings prevent ambient air ingress, while specialised dielectric fluids exhibit hydrophobic properties that prevent water absorption to maintain the fluid’s dielectric properties. These fluids thermodynamically destabilise water mixtures, causing moisture to separate and collect in designated drainage points rather than dispersing through the cooling circuit. Material selection plays an equally important role, with anodised aluminium surfaces and hydrophobic coatings reducing condensation adhesion even in hybrid cooling systems that incorporate some air exposure. For applications where complete sealing isn’t feasible, engineers have developed predictive strategies using real-time humidity sensors coupled with adaptive fan control algorithms. These systems maintain surface temperatures slightly above dew point through precise modulation of cooling intensity, preventing condensation formation while minimising energy expenditure. The approach demonstrates how modern thermal management increasingly relies on integrated hardware and software solutions to address environmental challenges. Weight optimisation Cooling system mass represents a significant penalty in battery pack design, typically adding 0.5–5 kg per kWh of capacity depending on architecture and materials. This weight directly impacts vehicle range and performance, driving intensive efforts to minimise cooling system mass without compromising thermal performance. Consequently, several innovative approaches have emerged. Material science breakthroughs have enabled thinner, stronger cooling components. High-conductivity, highstrength aluminium alloys now allow cold plate thickness reductions of up to 30% compared with that of conventional designs, while maintaining structural integrity and heat transfer capability. Some systems eliminate traditional thermal interface materials entirely, instead using direct cooling surfaces that conform to cell geometries – an approach that both saves weight and lowers thermal resistance. System architecture plays an equally important role in weight reduction. Microchannel designs optimise fluid flow paths to minimise required coolant volumes, while integrated structural cooling components serve dual purposes as both heat exchangers and loadbearing elements. The most advanced implementations achieve cell spacing as tight as 1 mm through precision cooling channel routing, maximising energy density without creating thermal bottlenecks. These compact designs demonstrate how holistic engineering can reconcile the seemingly competing objectives of thermal performance and mass efficiency. Pressure drop optimisation Hydraulic efficiency represents a critical but often overlooked aspect of cooling system performance. Excessive pressure drop increases pump energy consumption and can lead to uneven cooling distribution across large battery packs. Modern systems employ several strategies to To minimise energy consumption through pumping losses, simulation in cold plate design is used to optimise flow velocity, pressure and flow dynamics for efficient, effective cooling (Image courtesy of Baknor)
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