Laboratory Qualification Protocols for Low Temperature Battery Pack Thermal Design
Sub-zero thermal qualification requires precise soak verification, active heating uniformity controls, and three-electrode plating boundary detection.
Heat Exchanger Plate
Meaning
Metallic thermal transfer barriers transfer thermal energy between separated fluid streams to regulate battery pack temperatures during high-rate charge and discharge cycles. Corrugated channels stamped into stainless steel or aluminum sheets promote turbulent fluid flow, maximizing heat transfer coefficients while maintaining low fluid pressure drop. The individual heat exchanger plate operates within a stacked fluid assembly where coolant channels interface directly with cell surfaces or structural potting compounds.
Thermal management systems rely on these components to maintain pack temperature uniformity within specified operational windows.
Surface Geometry
Stamped chevron patterns alter fluid boundary layers to increase convective heat transfer efficiency. Turbulent flow induced by internal ridges disrupts stagnant fluid layers along channel walls. Integrating the heat exchanger plate into battery module structures requires structural rigidity to withstand hydraulic pressure fluctuations without mechanical deformation.
Thermal Resistance
Interfacial material selection governs conductive efficiency between heat sinks and active cell housings. Thermal interface materials eliminate microscopic air gaps, reducing total thermal resistance across the module assembly. The heat exchanger plate limits maximum cell operating temperatures during continuous high C-rate operation.
Fluid Pressure
Pressure drop across cooling circuits dictates circulating pump power requirements in liquid management systems. Excessive flow restriction reduces cooling efficiency and increases parasitic energy consumption. Corrugated features on the heat exchanger plate balance thermal hydraulic efficiency against internal fluid friction losses.