Fluent Equivalent Circuit Model Applied to Steady-State Battery Module

Hello and welcome to this video on Fluent Equivalent Circuit Model Applied to Steady-State Battery Module. I'll just walk through the online view tree. First, this is going to be a steady-state simulation. As you can see on the right, there's a battery module.

This battery module has two plastic end plates. It has a cold plate underneath. The tops are connected with bus bars. And there are multiple cells for this model. So when I turn on the battery model, the energy model is automatically turned on.

The cold plate has water flowing through it at very low flow rates. So we'll leave the viscosity at laminar. Digging into the battery model. First, we'll see that the solution method is set to circuit network. And the electrochemistry model is set to equivalent circuit model.

For the study, I changed these energy source options as well as the nominal cell capacity and the charge rate. In conductive zones, I've selected all of the active cells for active components. And then the bus bars and tabs for the passive components. Electrical contacts.

We have a negative terminal and a positive terminal. In the model parameters, I've set the initial state of charge to 1. And reference capacity at 56. These are values that I changed in the study. But for this purpose, we'll look at the parameter estimation method.

And for this, the current state of charge. And the capacity fade effect is turned off. Using the testing battery's capacity of 56 to match what the HPPC test data was used. And using the 6P parameter model. The next step is to load the HPPC test data files.

And to do that, I'll go here and select these are all my test data files. I'll just select them all using a left click with the shift. And click OK. And then from there, we'll do the fit parameters. So that generates the parameter fitting. And that generates these different curves.

And that is it for that. So we'll do a click on apply. And OK. And then the rest of the model is ready to go. The model is pretty much straightforward considering a CHT type of model. So using water as the coolant. And then for the solid, the cells are specified with an active material.

So with a density, specific heat, electrical conductivity, and orthotropic thermal conductivity. Using aluminum for the tabs and the shells. For the bus bars, the end plates use plastic material. And there's a thermal pad below the cells that's also specified.

So for the cold plate coolant, the cell zone is specified using the water. As mentioned before, examples here with the bus bars, copper. The cell has the active material assigned to it. No sources. Example tab, aluminum. Example shell, also aluminum.

The cold plate, that as material specifies aluminum. And here's our plastic end caps. And these connectors, they're at the ends of the bus bars. They're copper. And the thermal pad is specified with a thermal pad material. Boundary conditions, the cold plate has one inlet, one outlet.

So the inlet is specified with a flow rate as well as an inlet temperature. Cold plate outlet specified with a pressure outlet. And zero gauge pressure. And a backflow pressure or temperature of 300. In terms of the walls, a lot of these are coupled walls.

So an example of a wall that is not coupled. So any walls that are touching the void, they will be specified with a convection boundary condition using a convective heat transfer coefficient of 5 and a free stream temperature of 300 K. And then other than that, the default methods, default controls.

How many production settings, a general structure model, as well as the frying civilization, volume average temperature of the cells, the maximum temperature of everything. So we'll initialize this example. Things we look at elsewise, that would be the contours of the temperature.

Other items we can look at are variables within the battery variables group, things like the potential field, current magnitude on down the list all the way down to the total heat source. So that's an example of a setup for the equivalent circuit model. Thank you for viewing. Bye-bye.