Designing a battery management system is vital in precise estimation of the SOC over a broad range of vehicle navigation. So, the SOC of a cell is 100% when it is fully charged and 0% when it is wholly discharged. State of Charge is the amount of remained charge of a cell relative to its nominal capacity.
Lithium ion battery pulse test secods on off driver#
Monitoring the voltage, current and temperature of the battery, estimating the State of Charge (SOC), cell balance and thermal management are the dominant tasks of the BMS, which assures the driver that the battery is operating at the optimum point to achieve maximum performance. In order to reduce environmental pollution, decreasing fuel consumption and improving vehicle efficiency, a well-designed power control and Battery Management System (BMS) are crucial. At the present time lithium-ion batteries are the most reliable option for electric and hybrid vehicles among electrochemical systems due to their high energy and power, long life cycle, and low discharge rate. The development of clean powerful vehicles depends on finding a stable power that can offer excessive navigation distances and rapid acceleration. It seems that there is a brilliant potential for substituting internal combustion engines with electric vehicles.
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CAAI Transactions on Intelligence Technology.The SOC estimation accuracy based on the fractional-order equivalent circuit model of lithium-ion battery is validated.
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The simulation results show that the model has higher accuracy and better robustness against different driving conditions, different SOC ranges and different temperatures than the second-order RC equivalent circuit model. Thirdly, based on the mixed-swarm-based cooperative particle swarm optimization, parameter identification of the fractional-order equivalent circuit model is conducted using the federal city driving schedule experimental data in the time domain. Secondly, a fractional-order equivalent circuit model of lithium-ion battery is established, which can accurately describe the electrochemical processes such as charge transfer reaction, double-layer effect, mass transfer and diffusion of lithium-ion battery. Firstly, this paper analyzes the electrochemical impedance spectrogram of lithium-ion battery, and adopts impedance elements with fractional order characteristics such as constant phase element and Warburg element to improve the second-order RC integer equivalent circuit model based on the fractional calculus theory. So the models can be embedded in microprocessors and provide accurate results in real-time. To effectively use and manage lithium-ion batteries and accurately estimate battery states such as state of charge and state of health, battery models with good robustness, accuracy and low-complexity need to be established.