Flow simulation and analysis of high-power flow batteries

TitleFlow simulation and analysis of high-power flow batteries
Publication TypeJournal Article
Year of Publication2015
AuthorsKnudsen, Edward, Paul Albertus, Kyu-Taek Cho, Adam Z. Weber, and Aleksandar Kojic
JournalJournal of Power Sources
Date Published12/2015
Keywordscfd, Flow batteries, Power density, Pressure loss, simulation

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 cm2 to 400 cm2, 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.

Short TitleJournal of Power Sources