A simplified electro-chemical lithium-ion battery model applicable for in situ monitoring and online control

Abstract

The penetrations of lithium-ion batteries in transport, energy and communication systems are increasing rapidly. A meticulous model applicable for precise in-situ monitoring and convenient online controlling is in sought to bridge the gap between research and applications. This paper proposes a simplified electro-chemical model and its discrete-time state-space realization derived from the pseudo-two-dimensional model. The solution-phase migration and solid-phase diffusion dynamics with varying parameters are captured and rigorous mathematical expressions of reaction rate distribution and terminal voltage are derived. A simulation framework including initializing, stabilizing and closed-loop correcting schemes with low computation cost are designed. Numeric experiments on different types of batteries in various operating scenarios are conducted for validation.