Ansys Fluent and Li-ion Batteries

Vap96

How i chose LiFeP04 as active material , and why there is no option of editing Current collectors thickness?

wcao

Hi,

Actually the type of Li-ion battery, to be more specific, the electrode material will affect the simulation in two ways:

1. Through the material properties such as electric and thermal conductivities etc.;
2. Through the echem reactions, which is not explicitly included in the NGTK or ECM sub-models while in Neumann P2D sub models, the battery type influenced parameters are mainly the activation energy, charge transfer coefficient etc. In Neumann P2D model, the Butler-Volmer equation is solved for the echem reaction rates, in which the electrode material is not explicitly needed but just the according activation energy or charge transfer coefficient is needed. You will provide these parameters through the panel shown in my first reply. Please read the user guide carefully about the definition of the parameters that are used in the equations in the theory guide.

Regarding to the current collectors, usually they are tabs connecting with the electrodes/electrolyte so you can explicitly draw them in the mesh and set the material of them to be passive zones. Thanks.

wcao

Hello,

I wonder which model you were using currently? Is it MSMD battery module or the li-ion battery model included in the potential model? Thanks.

Best regards,

Weiyu

Vap96

https://forum.ansys.com/discussion/comment/102663#Comment_102663

Hello and thank you ,

I tried to use the MSMD , however i did not find any option about specifying properties such as current collector’s thickness, and even more basic such as selecting the cathode and anode material (LFP,LCO..etc and graphite ) ..Does this means that the material of the battery is fixed ? If not, how do i define these properties ?

wcao

Hello,

Thank you for your reply. If you are using MSMD with NGTK or ECM for echem sub-models, there is actually no need for the electrodes properties as anode or cathode are not dsitinguished in the model. The whole battery cell is treated as same material. If you are using Neumann P2D model, the properties are set in the battery model panel, as shown:

Here the anode and cathode properties are set separately. For more details, please read our Theory Guide and User Guide:

For MSMD model, the echems are solved by echem sub-models, which are not deployed on the CFD mesh. The echem sub-models are connected with the CFD calculation only with the j_chem and q_chem, as described in the theory guide so that the material properties are not required for the CFD calculation. Thanks.

wcao

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v211/en/flu_th/flu_bat_model_ECMs.html

wcao

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v211/en/flu_ug/flu_bat_MSMD_sec_battery_usage_setup.html

Vap96

https://forum.ansys.com/discussion/comment/102726#Comment_102726

Ok about this, but still it is not clarified what's the type of my battery model ... Lithium Cobalt Oxide? Lithium Iron Phospate or something else, what's the dimension of my current collectors ? .. these properties are essential for my results and i dont have a clue about them in Ansys

wcao

Hi,

Actually the type of Li-ion battery, to be more specific, the electrode material will affect the simulation in two ways:

1. Through the material properties such as electric and thermal conductivities etc.;
2. Through the echem reactions, which is not explicitly included in the NGTK or ECM sub-models while in Neumann P2D sub models, the battery type influenced parameters are mainly the activation energy, charge transfer coefficient etc. In Neumann P2D model, the Butler-Volmer equation is solved for the echem reaction rates, in which the electrode material is not explicitly needed but just the according activation energy or charge transfer coefficient is needed. You will provide these parameters through the panel shown in my first reply. Please read the user guide carefully about the definition of the parameters that are used in the equations in the theory guide.

Regarding to the current collectors, usually they are tabs connecting with the electrodes/electrolyte so you can explicitly draw them in the mesh and set the material of them to be passive zones. Thanks.

Vap96

https://forum.ansys.com/discussion/comment/103551#Comment_103551

Thank you very much !!!