In KULI different ways how to model a battery exist. They mainly differ in the necessary amount of input data, the effort for the creation of the model and also in the level of detail of the results.
This example shows the most reduced way how to model a battery. Therefore all cells, modules and housings of the battery are reduced to one single lumped mass model for the use in KULIs cell model.
This example loosely describes a liquid cooled Li-Ion traction battery with around 290 cells and an overall weight of 180kg. By the reduction to a lumped mass / cell model, the whole battery is reduced to a single mass with an averaged thermal heat capacity (cp value). The heat transfer surface is the sum of all single heat transfer surfaces (each cell is in contact with a liquid cooling plate), the heat transfer coefficient is modeled as function of the flow velocity. To convert the mass flow to a flow velocity, the overall cross section must be defined in the component parameters window.
Due to simplicity, the electric properties are reduced to a constant value resistance model. The values are based on the battery characteristics.
This way of modeling a battery is very fast and effective, with the limitation of getting averaged values. Therefore it’s very useful for the estimation of the (transient) heat input in the cooling system and for simulating the influence of the batteries’ inertia, but not for designing the batteries’ inner layout.Usable from release: KULI 9.1-0.01