Defining Custom Current Loads for Battery Models
You can define various types of current loads in your battery model using COMSOL Multiphysics with the add-on Battery Design Module. This can include time-varying loads, load profiles with sharp changes, and custom load cycles. Here, we discuss and demonstrate approaches for implementing custom current loads in the software, along with evaluating power losses in a battery and coupling your battery interface to other interfaces to gain further understanding of the underlying physical behavior of your battery in operation.
Discussion & Demo: Custom Loads, Power Losses, and Mechanical Couplings
In COMSOL Multiphysics, there are multiple options for defining different types of current loads and load profiles for your battery model. The different approaches for how you can implement this in the software are discussed, from a more manual approach to using predefined features. The load use cases for each type of feature are then detailed. Adding a stop condition to set the simulation to terminate after a logical criterion is met is also discussed, which can be done in a more automated way through the use of the previously mentioned predefined features or manually in the solver settings. This is followed by model demonstrations with which you can follow along with in the software where we define a Galvanostatic Intermittent Titration Technique (GITT) load cycle as well as look at power losses in a battery cell. This is followed with elaborating on the different factors that can cause power losses. Finally, we touch on how you can create mechanical couplings between a battery interface and structural or transport interface, to analyze effects such as intercalation strain.
- Overview of drive cycle analysis
- Overview of time-varying current loads
- Manual option for defining a time-varying current load
- Define an Interpolation function
- Enter function in the Electrode Current boundary condition settings
- Predefined features for defining custom current loads and the use cases for each
- Charge-Discharge Cycling feature
- Load Cycle feature
- Events interface
- Overview of the Stop Condition node
- Considerations for the Time Dependent Solver node
- Demo: GITT Load Cycle (follow along using start model file here)
- Define custom load cycle
- Load Cycle feature, C Rate node, Rest node used
- Subloop feature added for charging loop and discharging loop for battery
- Demo: Power Losses in a Lithium-Ion Battery
- Overview of built-in variables that can be used to capture many sources of power losses
- Overview of power losses and factors that effect it
- Overview of mechanical couplings for lithium-ion batteries
- Solid Mechanics interface, Transport in Solids interface, Transport of Diluted Species interface
Further Learning
For more information on the defining custom load cycles for your battery model and further practice in doing so, we recommend the following resources:
- Tutorial Models
- Blog Posts
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