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Efficient and safe Lithium-Ion Batteries have undoubtedly become the Holy Grail of the electric vehicle industry. Any OEM’s technical roadmap is currently focused on increasing battery lifetime, energy density, or above all on safety. The battery is definitively becoming a way to differentiate electric vehicle performance. Battery safety is central; any fire is unacceptable and can damage OEM’s image and Battery Electric Vehicle (BEV) acceptance. Therefore, solutions must be developed to cope with this dramatic issue. This paper presents a battery thermal management system, helping to increase battery lifetime, but, above all, making the battery pack safer. This system relies on the use of an innovative dielectric fluid in direct contact with electrochemical cells. Fluid physical properties are designed to accurately maintain the battery pack at a specific temperature in a daily life (fast charging and fast acceleration).