Hello PyBaMM Community,
I’m exploring methods to model the open-circuit voltage (OCV) versus state of charge (SOC) relationship in lithium-ion batteries. I’ve observed that composite functions incorporating hyperbolic tangent (tanh) and hyperbolic cosine (cosh) terms are often used to capture the nonlinear characteristics of OCV curves, especially the plateau regions and steep transitions.
I’m interested in understanding how researchers and practitioners arrive at such composite functions:
- What is the rationale behind choosing tanh and cosh functions for modeling OCV curves?
- Are there standard forms or templates for these composite functions, or are they typically derived empirically based on experimental data?
- What methodologies or best practices are recommended for constructing and fitting these functions to experimental OCV data?
I’m looking to gather insights into the derivation process of these functions
Any guidance, references, or shared experiences would be greatly appreciated.
Thank you!