Modeling of Li-ion Battery Performance in Hybrid Electric Vehicles

Abstract

Considerable improvements can be obtained in battery performance for hybrid electric vehicles (HEVs) by employing an electrochemistry-transport model based on a multi-physics modeling framework and ultrafast numerical algorithms. One important advantage of this approach over the lumped equivalent circuit (or look-up table) approach is the ability of the former to adapt to changes in design and control. In this work, we present mathematical and numerical details of our approach, and demonstrate the robustness of this battery model in simulation of short-pulse charge/discharge characteristic of HEV driving cycles under room and low temperatures.

Analysis of pulse and relaxation behavior in lithium-ion batteries

“…In the model we take the exchange current density to be independent of the solid lithium composition because the outer edges of the stacks are the LiC 6 phase, at least in the early stages of discharge or charge. 9 9 In Fig. 19 we will show for the base case that after 20 s the stacks on the surface of the secondary particle are fully converted to LiC12.…”

“…Eqs (9). and(10), respectively, are both functions of c 1 , however, here we utilize the composition variables x and y.…”

Analysis of Heat-Spreading Thermal Management Solutions for Lithium-Ion Batteries

“…This approach is popularly referred to as the single particle model. and Y. Ishikawa (of Honda R&D Americas, Inc.) evaluated and predicted cell aging [14].…”

“…Furthermore, Lithium-based batteries are attractive as energy storage systems since they are less toxic than nickel cadmium or lead acid cells, and their disposal poses fewer environmental problems. In addition, it offers 40-50% battery weight reduction and 20-30% volume reduction as well as some margin of efficiency improvement compared to nickel cadmium battery [14].…”

“…A typical Li-ion cell consists of negative electrode (or anode), electrolyte, separator, and positive electrode (or cathode); the two electrodes are separated by the separator, and electrodes are filled with electrolyte as shown in Figure 2-2. The electrolyte, often a good ionic conductor but an electronic insulator, provides a transport-medium for Li-ions to travel between the two electrodes and keeps electrons in the external circuit [14].…”