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Active thermal management is often used for Li-ion battery packs in all-electric and hybrid-electric vehicles. However, active thermal management technologies can be complex and costly. Passive thermal management is a cooling technology that absorbs heat solely via thermodynamics; i.e., convection, conduction, and radiation [6]. In this instance, more than 50 thermal vias should be used each with 0.3 to 0.5mm diameters on the copper pad area connecting the upper and lower copper pad. The PCB designer can play a role at fabrication, as well, by assuring certain techniques are used for LED thermal management.