Redox flow batteries (RFBs) have attracted increasing attention as large-scale energy storage systems in response to the growing adoption of renewable energy. To improve RFB performance, various flow field designs have been proposed, and topology optimization has emerged as a promising design approach. In this study, we apply a multiscale topology optimization framework that combines topology optimization with homogenization methods for flow field design in RFBs. By incorporating the homogenization method and reconstructing the flow field through projection-based dehomogenization, the proposed approach enables the generation of fine-scale flow channel structures that cannot be realized using conventional mono-scale topology optimization. Furthermore, a post-processing step introduces features of an interdigitated structure, which is known for its high performance, enabling the creation of curved, interdigitated flow channels. This approach allows efficient design of high-performance flow fields for RFBs. The proposed method achieves approximately a 30% improvement in performance compared with conventional mono-scale topology optimization and linear interdigitated flow field designs.
ONODA et al. (Wed,) studied this question.