ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Electrical-Thermal design of liquid cooled battery pack for Electric vehicles
Thermal management of battery packs is critical to ensure the healthy functioning of electric vehicles. Maintaining the cell temperature within its optimum range improves its life cycle by decreasing its capacity fade rate and hence extending the life of an electric vehicle. The thermal management solution being presented here employs a tabbed type liquid cooling technology that also assists to achieve low-temperature differential for an in-house designed battery pack consisting of 320 LFP cells (Size: 32700) with a total capacity of 240Ah. Thermal design of battery pack considers both charging and discharging boundary conditions i.e., maximum dissipation when continuously operating at 1C-rate conditions. In addition, an intelligent methodology is added for higher reliability – Cooling entire the battery pack from 50°C to 25°C within 30 min. Electrical-thermal simulations helped to characterize transient thermal behavior of the battery pack. Simulations results show that at 1C-rate charging, for ambient of 25°C, the maximum cell temperature peaks at 27.8°C. The maximum temperature differential between the cells developed was 2.5°C. The proposed thermal design is able to maintain temperature of cells in the optimum range and also satisfying important constraints like temperature variation of cells within the pack to be within 5°C.