The application of lithium ion batteries has been rapidly expanding from electric appliances and electronic devices to hybrid electric vehicles (HEVs) and electric vehicles (EVs), due to their high energy density. The main concerns when designing a Li-ion battery are its performance, life, and safety. The Ansys Fluent battery models allow simulating a single battery cell or a battery pack using CFD technology to study their thermal and electrochemical behavior.
Note that the Fluent Tutorials provides tutorials that illustrate how to use the Ansys Fluent battery models.
This chapter contains the following information:
Ansys Fluent has adopted the multi-scale multi-domain (MSMD) methodology in battery modeling. In this method, the whole battery is treated as an orthotropic continuum; thus, the mesh is no longer constrained by the micro-structure of the battery. Two potential equations are solved in the battery domain. To fit various analysis needs, the model includes three electrochemical submodels of different levels of complexity:
Newman, Tiedemann, Gu, and Kim (NTGK) and Direct Current Internal Resistance (DCIR) model
Equivalent Circuit model (ECM)
Newman’s Pseudo-2D (P2D) model
The model offers you the flexibility to study the physical and electrochemical phenomena that extend over many length scales in battery systems of various arrangements.
The MSMD method is a comprehensive method that allows the distributed heat source treatment to be accounted in a simulation. Moreover, Ansys Fluent also provides several uniform heat source treatment within the battery model framework, including CHT coupling, FMU-CHT coupling and the Circuit Network method (see Battery Solution Methods in the Fluent Theory Guide).
The following describes an overview of the procedure required in order to use the Battery Model in Ansys Fluent.
Start Ansys Fluent.
Read the mesh file.
Scale the grid, if necessary.
Load the module and use the Battery Model dialog box to define the battery model parameters.
Define material properties.
Set the operating conditions.
Set the boundary conditions.
Start the calculations.
Save the case and data files.
Process your results.
Important: Note that the majority of this manual describes how to set up the Ansys Fluent Battery Model using the graphical user interface. You can also perform various tasks using the text user interface.