Numerical investigation of liquid-Cooled battery thermal management system configurations for a lithium-ion battery pack with experimental validation
Abstract
Efficient thermal management is crucial for lithium-ion battery safety and longevity in Electric Vehicles (EVs). This study presents a numerical investigation and experimental validation of liquid cooling strategies for NMC lithium-ion battery modules, comparing serpentine (Configuration 1), parallel (Configuration 2), and parallel/counter-flow hybrid (Configuration 3) layouts. A custom-built 4-cell test rig validated against CFD simulations showed close agreement, with relative deviations below 0.6%, confirming model reliability. Under regulated flow conditions, clear differences in thermal and hydraulic behavior were observed. Configuration 1 exhibited the highest thermal stress, with peak temperatures reaching 75.7 [Formula: see text] (cell 7) and 74.1[Formula: see text] (cell 18) due to downstream heat accumulation and limited contact area, alongside the largest temperature difference (ΔT = 11.0 K) and highest pressure drop (27.3 Pa). Configuration 2 reduced peak pack temperature to 70.6 [Formula: see text] at cell 18 (6.7% lower vs. Configuration 1) and 64.7 [Formula: see text] at cell 7 (14.8% lower), achieving the best intra-cell uniformity (σ = 0.47 K, CV = 5.6%) and lowest pressure drop (9.1 Pa). Configuration 3 offered the most balanced cooling, lowering maximum cell temperature by 7.6% compared to Configuration 1 and 0.9% compared to Configuration 2, while the maximum temperature of cell 18 decreased by 11.8%. It achieved the narrowest inter-cell ΔT (4.1 K), a…
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