3D Modelling and Study of Electrochemical Characteristics and Thermal Stability of Commercial Accumulator by Simulation Methods

摘要

Lithium-ion batteries are one of the most expanding types of batteries on the market these days. Theyare widely used in recent years not only in portable devices but also increasingly in the automotiveindustry (BMW i3, Tesla S) or in aerospace (Boeing 787, Lockheed F-35) because of their very highcapacity and energy density. Demands on safety of these batteries grow with their use in more andmore devices. Safety is an important issue particularly in the case of Li-Ion batteries because of thelarge amount of energy stored inside them and also because of their great sensitivity to the conditionsin which these batteries are used. One possibility to verify the battery behaviour under differentconditions (current load, temperature), is the creation of a physical-mathematical model of the batteryand by using the simulation to predict its behaviour. These methods can save time when we testbatteries in a real device such as in a car for example. It is equally possible to set up a model of the realbattery and implement parameters of a new type of electrode material which is tested only in thelaboratory into the model. Then we can, thanks to the simulation, predict the behaviour of the batterywith this advanced material. Compilation of the physical-mathematical model of a real battery andverification of the model by using electrochemical testing of a real battery are discussed in this article.The real battery was discharged by different currents and its discharge characteristics were measuredby a potentiostat. At the same time, this cell was scanned with a thermographic camera in order toverify its heating. Discharge characteristics and battery heating were subsequently simulated by usinga physical-mathematical model. Deviations between the simulation and the measurement resultsobtained during heating by high current flow were very small - between 1 and 5 %.