Flow simulation and analysis of high-power flow batteries

JOURNAL OF POWER SOURCES

卷:299

Article

Knudsen, E.¹  Albertus, P.²  Cho, K. T.³  Weber, A. Z.⁴  Kojic, A.¹ 

[1] Bosch Res & Technol Ctr, Palo Alto, CA 94304 USA

[2] Adv Res Projects Agcy Energy, Washington, DC 20585 USA

[3] No Illinois Univ, Dept Mech Engn, De Kalb, IL 60115 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

关键词: Flow batteries;    CFD;    Simulation;    Power density;    Pressure loss;   

DOI  :  10.1016/j.jpowsour.2015.08.041

来源: Elsevier

【 摘 要 】

The cost of a flow battery system can be reduced by increasing its power density and thereby reducing its stack area. If per-pass utilizations are held constant, higher battery power densities can only be achieved using higher flow rates. Here, a 3D computational fluid dynamics model of a flow battery flow field and electrode is used to analyze the implications of increasing flow rates to high power density operating conditions. Interdigitated and serpentine designs, and cell sizes ranging from 10 cm(2) to 400 cm(2), are simulated. The results quantify the dependence of pressure loss on cell size and design, demonstrating that the details of the passages that distribute flow between individual channels and the inlet and outlet have a major impact on pressure losses in larger cells. Additionally, in-cell flow behavior is analyzed as a function of cell size and design. Flow structures are interrogated to show how and where electrode parameters influence pressure drops, and how regions where transport is slow are correlated with the presence of experimentally observed cell degradation. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free