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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Air-cooling Concepts for Li-Ion Battery Pack Thermal Management

Erik Yen
General Motors Global R&D, Warren, MI 48092, USA

Taeyoung Han
General Motors Global R&D, Warren, MI 48092, USA

Bahram Khalighi
General Motors Global R&D, 30500 Mound Rd., MC 480-106-256, Warren, MI 48090, USA

Abstract

Temperature greatly affects the performance, safety, and life of Li-ion batteries in plug-in and electric vehicles. The operating conditions for optimal battery performance as well as longer battery life occur in a very narrow temperature bandwidth, which depends on the environment and vehicle operation. In order to evaluate various cooling concepts and compare their cooling performances, it is imperative to understand the basic flow and heat transfer quantities associated with the cooling performance in terms of Inlet Temperature Difference (QITD). For air-cooling concepts with high QITD, one must focus on heat transfer devices with relatively high heat transfer coefficients (100 ~ 150 W/m2/K) at air flow rates of 300 ~ 400 m3/h, low flow induced noise, and low-pressure drops. In this paper, different air-cooling configurations using turbulators such as delta winglets, pin fins, and surface ribs are investigated using CFD simulations. The results show that the design concepts based on delta winglets and pin fins are able to achieve the required cooling performance of QITD greater than 150 W/K.

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