Battery thermal management for electric vehicles operating in cold climates
This work investigates thermal encapsulation of battery packs as a means of passive battery thermal management to improve the battery performance and decrease heating demand during the initial phase of driving in cold climates. In order to predict the effects of battery pack encapsulation, a robust battery model that captures the dynamic behaviour of large battery packs is necessary in addition to other simplified vehicle and powertrain subsystems. The presented work proposes an integrated simulation methodology that enables numerical simulation of the relevant phenomenon at battery module, powertrain and vehicle levels.
The battery modeling strategy uses a one-dimensional module discretized electrical-thermal approach. An electrical circuit model with 2RC Thevenin branches was used to capture the electrical performance and the Bernardi's heat generation equation was used to estimate the heat generated from each module. The developed strategy was found to be in good agreement with measured test data. Vehicle simulations were performed under parking-driving scenarios to investigate the effectiveness of battery pack encapsulation at different ambient temperatures. It was found that the percentage of energy saved with battery pack encapsulation increased with decreasing ambient temperatures. The thermal resistance of the encapsulation material played a significant role in reducing heat loss to the environment. The simulations indicated that there is a potential of approximately 15% energy savings as a result of increased initial battery temperatures.
battery pack encapsulation
Anandh Ramesh Babu
Chalmers, Mekanik och maritima vetenskaper, Fordonsteknik och autonoma system
System-level modeling and thermal simulations of large battery packs for electric trucks
Energies,; Vol. 14(2021)
Artikel i vetenskaplig tidskrift
Ramesh Babu, A., Andric, J., Minovski, B., Sebben, S, Thermal encapsulation of large battery packs for electric vehicles operating in cold climate
Förbättrad energieffektivitet och klimatisering hos batteridrivna fordon genom inkapsling av värmegenererande enheter
Energimyndigheten (48024-1), 2019-04-01 -- 2023-06-30.
Strömningsmekanik och akustik
Gamma - Delta, M-huset and Zoom (contact firstname.lastname@example.org for password)
Opponent: Prof. Christophe Duwig, KTH Royal Institute of Technology, Sweden