15 Thermal Management Interview Questions for EV Roles

Battery cooling, cabin HVAC, heat pumps, fast-charging thermal protection — the 15 questions that recur in EV thermal-management interviews at OEMs and Tier-1 suppliers.

Thermal management is one of the highest-leverage engineering disciplines in EV — every percentage point of efficiency gain or every minute shaved off fast-charge time has a direct customer-experience impact. Interviewers test breadth across pack + cabin + motor + power-electronics cooling.

Battery pack cooling

Walk through air-cooled vs liquid-cooled vs immersion-cooled pack designs and where each makes sense.
Design a coolant flow rate for a 60kWh pack accepting 150kW DC fast charging — what assumptions drive the answer?
What's the design target for cell temperature uniformity across a pack and why does it matter?
How do cold-plates differ from serpentine tubes vs immersion designs?
What's the role of the battery chiller and when does the AC compressor priority switch?

Cabin HVAC + heat pumps

Why is a heat pump the right choice for EVs over a PTC-only design? Quantify the range benefit at 0C ambient.
Walk through R-1234yf vs CO2 refrigerant trade-offs for EV heat pumps.
How does cabin pre-conditioning (via app or scheduled) change real-world range?
What's the trickiest failure mode for an EV heat pump and how do you mitigate it?

Motor + inverter cooling

Walk through oil-spray cooling for high-torque traction motors. Why is it gaining adoption?
Design the cooling-jacket flow rate for a 150kW PMSM at sustained 80% torque.
What's the inverter cooling architecture: parallel with motor loop or separate?

Fast-charging + system-level

Walk through your thermal-protection strategy for a 350kW DC fast-charge session in 40C ambient.
What's the cell-level temperature trade-off between charge-speed and cycle-life?
How does thermal management differ between an e-2W and an e-SUV? Frame around mass + airflow + cost.

Where to go from here

Thermal-management interviews reward calculation comfort + system-level perspective. Practise estimating coolant flow rates, heat-rejection budgets and pack-temperature gradients out loud. Cite specific component-level products (Modine cold-plates, Mahle thermal-management modules, Gentherm cabin heaters) where relevant.

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