Thermal modeling and library-development of battery models for electric vehicles with Dymola/Modelica

Abstract

Batteries, used as energy sources for the electric vehicles, have to be managed thermally, in order to work at maximum performance and have a long life of durability. In this study, thermal management of these batteries are modeled and simulated with the aid of Dymola/Modelica. Until this study there were not enough modeling of batteries for electric vehicles using Dymola/Modelica program.<br />Referencing the test results and values of a thesis, thermal model of a cell is built and validated. Outgoing from this model, existing models are simplified and extended to new models. In the first part, the models are built randomly to achieve an optimal basic model. After achieving this model, it is modified or changed to built various models in a wide range. Using this models and adding them to another model, cell and pack models are built. These models also vary according to boundary conditions and components. Every model is built simply to be easily modified according to the purpose of the users. If required additional models or components can be connected or combined with these models. The library also consists of components, used to couple the electric battery models easily. The last part of this thesis includes the comparison of the test results and simulation results with expressing the difference and their causes. Additional information about the test used for comparison (e.g. boundary conditions, cell properties, material parameters and values used for calculations) is also expressed on the last section. Computational fluid dynamic results from previous work are used to validate the models. A wide range of simulation has been run and most concerning problems, important simulations are mentioned step by step with their details. At the end, the library is developed using the experience gained through this study. This library is developed for the users to simulate user defined models without making much effort and avoids the users to get involving in modeling part of the simulation. It is also a leading library for the developers to develop additional library to be combined and used with this library.