Journal
ENERGY
Volume 113, Issue -, Pages 852-860Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2016.07.076
Keywords
Lithium-ion cells; Thermal runaway; Convective cooling; Heat pipe; Thermal management
Categories
Funding
- CAREER Award from the National Science Foundation [CBET-1554183]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1554183] Funding Source: National Science Foundation
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While Li-ion cells offer excellent energy conversion and storage capabilities for multiple applications, including electric vehicles, heat removal from a Li-ion cell remains a serious technological challenge that directly limits performance, and poses serious safety concerns. Due to poor thermal conductivity of Li-ion cells, traditional cooling methods like air cooling on the cell surface do not effectively access and cool the core. This may lead to overheating of the cell core. This paper investigates the cooling of Li-ion cells using an annular channel through the axis of the cell. Air flow through this channel and heat pipe insertion are both shown to result in effective cooling. A temperature reduction of 18-20 degrees C in the cell core is observed in heat pipe experiments, depending on heat pipe size, for 1.62 W heat dissipation. Similar effect is observed when a thin metal rod is used instead of a heat pipe. Experimental measurements are close to finite-element simulation results. Experiments demonstrate that a heat pipe successfully prevents overheating in case of sudden increase in heat generation due to malfunction such as cell shorting. This paper illustrates fundamental thermal-electrochemical trade-offs, and facilitates the development of novel and effective cooling techniques for Li-ion cells. (C) 2016 Elsevier Ltd. All rights reserved.
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