Abstract
Thermal characterization of lithium-ion batteries is essential to improve an efficient thermal management system for lithium-ion batteries. Besides, it is needed for safe and optimum application. The investigated lithium-ion battery in the present research is a commercially available lithium titanate oxide-based lithium-ion battery, which can be used in different applications. Different experimental facilities were used to measure lithium-ion battery heat generation at different operating conditions and charge and discharge rates in this investigation. Isothermal battery calorimeter is the exclusive calorimeter globally, suitable for lithium-ion batteries’ accurate thermal measurements. Pulse charge and discharge in different increments of state of charge were applied to the lithium titanate oxide-based lithium-ion battery to designate the heat generation of the lithium-ion battery cell. Three different cases were studied. The precise effects of different state-of-charge levels and current-rates on lithium-ion battery total generated heat was investigated. The maximum heat generation during 13 A, 40 A, 50 A, 60 A and 100 A pulse discharges were 0.231 Wh, 0.77 Wh, 0.507 Wh, 0.590 Wh and 1.13 Wh correspondingly. It could be inferred that in the case of periodic charge and discharge pulses applied to the lithium titanate oxide-based lithium-ion battery, important parameters including state of charge, current rates, initial cycling, and temperature have a significant influence on total generated heat.
Highlights
A specific fixture was designed for the lithium-ion battery, which refrains from expansion in the lithium-ion battery cell attributable to the surrounding lithium-ion battery chamber
A specific fixture was designed for the lithium-ion battery, which refrains from expansion in the lithium-ion battery cell volume caused by working with significant current rates and significant temperatures
In the state of charge range of 90.5% to 75.75%, the average heat generation rate quantified for the lithium titanate oxide-based lithium-ion battery cell during 100 A step discharge cycles was more significant by 0.33 Wh and 0.82 Wh than that observed for the 40 A and 13 A step discharge proportionately
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. It was demonstrated that lithium-ion batteries’ electrical performance depends significantly on the working temperature, with a decline of almost ninety-five percent in energy density for the lithium-ion batteries at. The lithiumion battery’s heat generation rate was determined under various states of charge and temperature [16]. Different investigations have been accomplished to determine the charge and discharge capabilities of different lithium-ion battery chemistries to enhance precision in the state of charge approximation and characterize lithium-ion battery performance at different temperatures [23,24]. Comprehension of heat generation is essential in diminishing the significant temperature effects in lithium-ion batteries. In [31], the effect of discharge current-rates and state-of-charge on the heat loss and efficiency of a lithium-ion battery was studied. The previous investigations focused on understanding the lithium-ion battery’s heat generation behavior during full charge and discharge cycles.
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