Open-Circuit Voltage and Differential Voltage Modeling of a Lithium-Ion Battery
Application ID: 141491
How the open-circuit voltage (OCV) of a lithium-ion battery varies with the state of charge is governed by various physical properties such as the thermodynamics of the electrode reactions, the relative capacities of the electrode materials, and the amount of cyclable lithium, but also on the chosen voltage boundaries set by the battery engineer.
This tutorial shows how the OCV curve of a lithium-ion battery can be computed based on the abovementioned properties. It is also demonstrated how to plot the differential voltage (dVdQ) curves for the individual electrode materials, and the cell.
OCV and dVdQ curves are modeled both for a pristine battery and for an aged battery that has lost 20% of cyclable lithium due to parasitic reactions.
This model example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Tabella delle Funzionalità and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.