Abstract
The energy density of canode materials for lithium-ion batteries has a major impact on the driving range of electric vehicles. In order to study the charge-discharge characteristics and application feasibility of Li-NiMnCo lithium-ion batteries for vehicles, a series of charge and discharge experiments were carried out with different rates of Li-NiMnCo lithium-ion batteries (the ratio of nickel, cobalt, and manganese was 5 : 2 : 3) in constant-current-constant-voltage mode. Firstly, a set of charge-discharge experiments were performed on different types of single-cell lithium-ion batteries. The results show that, under temperature conditions, the charge and discharge voltage-capacity curves of the four different types of Li-NiMnCo lithium batteries mentioned in the paper are not much different, and the charge-discharge characteristic curves are similar, indicating that different types of batteries with the same material composition have similar charge and discharge characteristics. Subsequently, a series of charge and discharge tests with different rates were conducted on such ternary lithium batteries. The characteristic curves with different charge-discharge rates indicate that this new type of ternary lithium battery has high current charge and discharge capability and is suitable for use in new energy electric vehicles. In addition, by analyzing the voltage-SOC curve under different magnification conditions, it is known that there is an approximate linear relationship between the battery voltage value and the SOC within a certain SOC range. The SOC value can be evaluated by the battery voltage, which should be controlled within a reasonable range to avoid overcharge or overdischarge of battery, thereby, causing permanent damage to the battery.
Highlights
Electric vehicles (EVs) are widely regarded as the most promising vehicles and have been developed rapidly in recent years
It is usually the best choice to use Journal of Energy the lithium-ion battery as storage cell based on comprehensive consideration of its energy and power density and cycle-life for battery electric vehicles (BEVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs)
The characteristics of different Li-NiMnCo lithium batteries are analyzed through a series of charge and discharge experiments
Summary
Electric vehicles (EVs) are widely regarded as the most promising vehicles and have been developed rapidly in recent years. The development of anode materials with high energy density, long life, high safety, and low cost is crucial for the large-scale commercial use of lithium batteries and electric vehicles [8]. In order to provide data support and theoretical support for battery management, the test method is generally used to study the performance of the battery and a large number of experimental data are used to summarize the external characteristics of the battery in practical application Promising applications such as EVs and smart grids have already encouraged many researchers to improve the performance of lithium-ion batteries. (1) A series experiments were designed to determine capacity of Li-NiCoMn lithium-ion battery under different conditions in CC charge (2) Charge and discharge characteristic curves of lithium-ion battery are obtained under different conditions in CC charge (3) The experiments’ results can provide support for searching the proper charge current rate of battery in order to further improve charge performance.
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