University of California

Lg Energy Solution, Ltd.

Geum-Bee Kim

Won-Tae Joe

Hyoung Jun Ahn

Qingzhi Lai

Xinfan Lin

Disclosed is an analytic sensitivity expression for parameters of a battery electrochemical model, based on model reduction and reformulation techniques such as the single particle assumption, Padé approximation, and Laplace transform. The analytic expressions of sensitivity are in a compact form with explicit relationship to the current input, which enables the direct optimization of the input-dependent sensitivity. The current optimization with maximum sensitivity may be performed for several critical battery electrochemical parameters, namely a solid-phase lithium diffusion coefficient, a volume fraction of the electrode active material, and a reaction rate constant. The electrochemical parameter may be reliably identified using the optimal current profile.

System and method for optimization of current excitation for identification of battery electrochemical parameters based on analytic sensitivity expression

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Daejeon, South Korea

Geum-Bee Kim