Modeling of a Hollow-in Lithium-Ion Battery for Thermal Design

Abstract

The lithium-ion battery (LIB) is one of the preferred candidates for grid-scale energy storage systems due to its outstanding characteristics such as high energy density, modular scalability, long cycle life, and low self-discharge rate among others.In a batterymodule forgrid-scale energy storage applications, an uneven temperature distribution in thecell can be created depending on theoperating conditions and the types ofthermal management. Uneven temperature distribution in amodule couldcauseanelectricalimbalance and thus lead tothelower performance and shorter life of battery. It is, therefore, important to calculate accurately the uneven temperature distribution in a batterycell in order to achieve the optimum performanceand long lifeof the batterycell. In this work,amodelingis performed toinvestigate the effects of thermal design on the thermal behavior of ahollow-in lithium-ion battery.The modeling of the potential and current density distributions on the electrodes is validated by the comparison between experimental and modeling discharge curves at various discharge rates from 0.5 C rate to 4 C rate. Then, the thermal modeling of the lithium-ion battery is carried out, which accounts for the ohmic heating and the heat generated due to charge transfer at the electrode/electrolyte interface. The heat generation rate is calculated using the results of the modeling of potential and current density distributions. Fig.1 shows the schematic diagrams of hollow-in lithium-ion battery. The temperature distribution in hollow-in lithium-ion battery with 4 C rate constant current discharge is shown in Fig. 2. Figure 1