The authors previously proposed and successfully studied the feasibility of an innovative Battery Thermal Management System (BTMS) relying on Loop Heat Pipes (LHPs) and graphite sheets. LHPs act as thermal vector connecting the bottom of the battery pack and a remote chiller, whilst the graphite sheets allow to achieve satisfactory temperature homogenization of the cells surface, containing the added system weight. This design was developed aiming to improve on fast charge timings, all-electric range and reduce costs and complexity. Preliminary studies revealed the potential of this innovative passive BTMS of providing better performance of an active BTMS using a liquid cold plate. Taking a further step in the direction of practical applications, the present work investigates how the proposed BTMS performs in different ambient temperatures by showing the results of several fast charge and heating tests inside an environmental thermal chamber, with temperatures ranging between -20°C to 50°C. The results showed that the LHP worked in all the tested conditions, and that the detrimental undesired cooling provided by the LHP during heating phase (i.e., 1.2°C) was surpassed by the temperature reduction during the cooling phases (i.e., 3.2°C).
Experimental Investigation on the influence of ambient temperature in a Loop Heat Pipe Battery Thermal Management System
Marco MarengoSupervision
2023-01-01
Abstract
The authors previously proposed and successfully studied the feasibility of an innovative Battery Thermal Management System (BTMS) relying on Loop Heat Pipes (LHPs) and graphite sheets. LHPs act as thermal vector connecting the bottom of the battery pack and a remote chiller, whilst the graphite sheets allow to achieve satisfactory temperature homogenization of the cells surface, containing the added system weight. This design was developed aiming to improve on fast charge timings, all-electric range and reduce costs and complexity. Preliminary studies revealed the potential of this innovative passive BTMS of providing better performance of an active BTMS using a liquid cold plate. Taking a further step in the direction of practical applications, the present work investigates how the proposed BTMS performs in different ambient temperatures by showing the results of several fast charge and heating tests inside an environmental thermal chamber, with temperatures ranging between -20°C to 50°C. The results showed that the LHP worked in all the tested conditions, and that the detrimental undesired cooling provided by the LHP during heating phase (i.e., 1.2°C) was surpassed by the temperature reduction during the cooling phases (i.e., 3.2°C).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
