A transient reduced order model for battery thermal management based on singular value decomposition

Battery thermal management for high power applications such as electric vehicles and hybrid vehicles is crucial. Modeling is an indispensable tool to help engineers design better battery cooling systems. A reduced order model (ROM) for battery thermal management based on singular value decomposition (SVD) is proposed. The ROM generation process starts with computation fluid dynamics (CFD) results of a battery model, from which SVD is used to calculate the approximate subspace which temperature solution belongs to. Then a state space model is created for each dimension of the subspace. The state space model is created taking advantage of the linear and time-invariance (LTI) properties of the battery thermal system. The state space model, the ROM, is then shown to provide very similar results as those from CFD under arbitrary transient power dissipation. The ROM runs orders of magnitude faster than the original CFD model.