Nachhaltiges Thermomanagementsystem – speziell für eFahrzeuge

Autoren

R. Heckt, T. Haas - HANON Systems Deutschand GmbH

Zusammenfassung

Due to significantly lower energy conversion losses in the powertrain, battery electric vehicles (BEV) have a challenge in fullfilling the heating requirement of the cabin in parallel to the heating demands of the battery in the colder months of the year. Similarly in the warmer months, the cooling requirements of the cabin coupled with the increased cooling requirements of the battery during fast charging requires new technology to assure customer expectations in comfort and vehicle performance/range are met.

In recent years, heat pump technology has been used to ensure that the heating and cooling requirements in BEV's are efficiently covered. The refrigerant R744 is particularly suitable for maximizing the operating temperature range and performance of such heat pumps and, above all, the holistic sustainability of the entire thermal management system. The high power density of R744 systems is further advantageous for the implementation of (up to) 15kW cooling capacities for powerful battery temperature control in the case of fast charging with 300kW.

In addition to presenting the key components of an R744 AC/HP system, such as com-pressors, switching and expansion valves and heat exchangers, the presentation will deal with special boundary conditions and describe recommendations for a particularly efficient arrangement.