One-dimensional physics-based reduced-order model of lithium-ion dynamics

▸ We derive a reduced-order discrete-time state-space model of a lithium-ion cell. ▸ We start with known Laplace-domain transfer functions of the porous-electrode model. ▸ Then, we derive transfer functions for electrolyte concentration and the potentials. ▸ Using the discrete-time realization algorithm, we produce a reduced-order model. ▸ A fifth-order model can accurately model a dynamic drive cycle.