Multi-fidelity electrochemical modeling of thermally activated battery cells

JOURNAL OF POWER SOURCES

卷:488

Article

Voskuilen, Tyler G.¹  Moffat, Harry K.¹  Schroeder, Benjamin B.¹  Roberts, Scott A.¹ 

[1] Sandia Natl Labs, POB 5800,MS 0828, Albuquerque, NM 87185 USA

关键词: Thermally activated battery;    Molten-salt battery;    LiSi-FeS2;    Multi-physics modeling;   

DOI  :  10.1016/j.jpowsour.2021.229469

来源: Elsevier

【 摘 要 】

Thermally activated batteries undergo a series of coupled physical changes during activation that influence battery performance. These processes include energetic material burning, heat transfer, electrolyte phase change, capillary-driven two-phase porous flow, ion transport, electrochemical reactions, and electrical transport. Several of these processes are strongly coupled and have a significant effect on battery performance, but others have minimal impact or may be suitably represented by reduced-order models. Assessing the relative importance of these phenomena must be based on comparisons to a high-fidelity model including all known processes. In this work, we first present and demonstrate a high-fidelity, multi-physics model of electrochemical performance. This novel multi-physics model enables predictions of how competing physical processes affect battery performance and provides unique insights into the difficult-to-measure processes that happen during battery activation. We introduce four categories of model fidelity that include different physical simplifications, assumptions, and reduced-order models to decouple or remove costly elements of the simulation. Using this approach, we show an order-of-magnitude reduction in computational cost while preserving all design relevant quantities of interest within 5 percent. The validity of this approach and these model reductions is demonstrated by comparison between results from the full fidelity model and the different reduced models.

【 授权许可】

Free