Experimental and theoretical investigations of heat generation rates for a water cooled LiFePO4 battery

Abstract

Understanding the rate of heat generation in a lithium-ion cell is critical for the safety and performance behaviour. This paper presents in situ measurements of the heat generation rate for a prismatic Lithiumion battery at 1C, 2C, 3C and 4C discharge rates and 5°C, 15°C, 25°C, and 35°C boundary conditions (BCs). For this work, an aluminum-laminated battery consisting of LiFePO 4 cathode material with 20 Ah capacity was adopted to investigate the variation of the rate of heat generation as a function of the discharge capacity. Ten thermocouples and three heat flux sensors were applied to the battery surface at distributed locations. The results of this study show that the highest rate of heat generation was found to be 91W for 4C discharge rate and 5 °C BC while the minimum value was 13W measured at 1C discharge rate and 35 °C BC. It was also found that the increase in discharge rate and thus the discharge current caused consistent increase in the heat generation rate for equal depth of discharge points. The model is later developed using the neural network approach and validated. The heat generation rate predicted by the simulation demonstrates an identical behavior with experimental results.

Better thermal management options with heat storage systems for various applications: An Evaluation

“…In the industry and academia, the interest on innovative technologies and novel uses of current technologies related to better thermal management strategies to minimize waste energy (ie, heat) generation has been growing rapidly . The reason for this growing interest is some of the environmental and economic issues related to the worldwide energy use . Some of these issues are listed as follows: Limited nature and nonhomogeneous distribution of fossil fuels. Challenges related to reaching remaining fossil fuel reserves, which are becoming less accessible. Greenhouse gas emissions related to fossil fuel use and associated climate change concerns. Fluctuating fossil fuel prices and the dependence on imported fossil fuels. Fluctuations in daily and seasonal energy demands. …”

Simplification strategy research on hard‐cased Li‐ion battery for thermal modeling

“…BTMS has been commercially applied with air cooling, liquid cooling, and ohmic heating . Moreover, in recent years, some novel methods have been developed, such as phase‐change materials cooling from liquid to gas and from solid to liquid, heat pipes cooling, or a combination use of them .…”

A comprehensive investigation on thermal management of large‐capacity pouch cell using micro heat pipe array

“…Among them, the C‐rate performs an important function in the heat generation rate of the battery. Panchal et al developed a model for the heat generation rate of the battery, and the model demonstrates that the cell temperature augments with increasing C‐rate due to the augmentation of the heat generation rate. The temperature inhomogeneity of the battery also increases with the increase of C‐rate since the heat generation rate in different part is not the same, especially for large‐capacity battery.…”