Papers by Keyword: Lithium Battery

Abstract: Pure lithium-ion batteries for electric vehicles in the course of the temperature rise, not only directly affect the performance and life of the battery, there is a potential safety hazard. In this paper, a pure electric vehicle with a lithium-ion battery pack with no heatsink, through testing and without thermal simulations with a model feasibility analysis.

Abstract: A hybrid mobile power supply is developed based on air-cooled Proton Exchange Membrane Fuel Cell (PEMFC) and lithium battery. Pure fuel cell provides a rated output of 25W. With the assistance of lithium battery, the system provides instantaneous power of 50W. The system consists of fuel cell and its controller, lithium battery and its management circuit, power switching circuit, system control circuit and DC/DC convert circuit. The system is designed and realized, the measurement results show that the system works steadily below 50W.

Abstract: Based on practical project and application, the design scheme of small capacity of integrated PV and storage grid-connected generation system is presented in this paper. For demonstrative and experimental purpose in this project, it includes several typical PV modules, tracking system and grid-connected inverters. Entire design scheme covers system integration, grid-connected solution, PV array and bracket, monitoring system, energy storage system, and etc. Configuration and application prospect of energy storage system in grid-connected PV system are mainly introduced. The characteristics of lithium battery and vanadium redox flow battery, as well as their application in the field of distributed power generation are researched.

Abstract: To solve the wide range of the output voltage, difficult storage and not unified interface of solar cell, a novel solar charging system was proposed. The system consists of the solar panel, the voltage regulator circuit, the battery charge management circuit, the lithium battery, the booster circuit and the USB output circuit. The voltage regulator circuit can convert the output voltage of solar panel into 5V. By means of the charge management circuit, the energy is stored in the lithium battery, and it can be provided to the load via the booster circuit and USB interface, which can achieve the goal of the conversion, storage and utilization from solar to electrical energy. Under the condition of effective illumination between 10:00 and 16:00, the solar charging system was tested for 7 days. Experimental results show that the output voltage always maintained at 5V during the test. The output voltage of lithium battery reaches to 4.2V after four hours, and the output voltage of USB port always stabilizes at about 5V.

Abstract: There are many kinds of mobile power supply, in this paper, aiming at the existing mobile power cannot be automatically continued charging problem, an automatic charging and discharging circuit design, and put forward the improvement circuit corresponding to the common lithium battery over-voltage and over-current protection, battery monitoring problem. The widespread use of application of STC15W401AS, SX2105, DS2762 chip as the core device, with the corresponding peripheral circuit, provides a reference for the application of charge power supply protection circuit of lithium ion batteries based on SCM system.

Abstract: The establishment of an accurate battery model is crucial to the design and research of battery and battery management system. This paper takes 180Ah LiFePO4 as research object, adopts PNGV model to describe the working characteristics of the battery,establishes PNGV simulation model in MATLAB/Simulink, recognizes the model parameters based on the experiment of HPPC pulse, verifies the accuracy of model in different conditions. The results show that PNGV model can show the dynamic characteristic of battery well.

Abstract: The Thevenin equivalent circuit model is established for single lithium battery,current and voltage data to identify the parameters of the equivalent circuit is obtained by the discharge experiment, and the open circuit voltage and charge state relationship curve was obtained by curve fitting.On this basis, design the extended Kalman filter algorithm and unscented Kalman filter algorithm on the lithium battery state of charge, then use Matlab/Simulik simulation, the results of the state prediction of the two different algorithms are compared. The analysis results show that two kinds of algorithm are effective for single lithium battery state of charge estimation, and no trace of Calman filter algorithm can effectively solve the the problem of accuracy is not high of the extended Calman filter ,which due to the linear approximation.

Abstract: Recently, the battery industry has represented one important and growing sector where the use of non-toxic and non-hazardous substitute materials has not rapidly developed. The environmentally friendly polymer electrolyte is required to decrease the risk of environmental pollution caused by toxic materials of battery components. Therefore, in this study was focused on the preparation of the environmentally friendly polymer electrolyte membrane with low cost for lithium-ion battery applications. The preparation of polymer electrolyte membrane was done by casting of polymer solution. The main materials used to prepare polymer electrolyte membranes are sulfonated polystyrene (SPS) obtained from isolation of Styrofoam, hydrolyzed bacterial poly(R-hydroxybutyrate) (PHB), and lithium perchlorate (LiClO4) as an ionic salt. The isolated polystyrene was reacted with acetyl sulfate to form sulfonated polystyrene (SPS). These three main materials were dissolved in an appropriate solvent and mixture until homogenous. The polymer solution was poured into a petri dish, and then their solvent was evaporated. The results showed that the increase LiClO4 content in the membranes, the conductivity of membrane increases, but their mechanical strength decreases and the surface morphology of membranes becomes less uniform and homogenous.

Abstract: All-solid-state composite polymer electrolyte is a multiphase material that adopted an organic polymer as the main matrix. Performance improvement of electrolyte materials can be achieved by complexation between functional groups from the polymer molecular chain and the ions and, by adjusting the component and proportion of polymer and modified filler. This manuscript presents a new idea for preparation composite polymer electrolyte based on the poly (ethylene oxide). We use scanning electron microscopy (SEM), AC impedance measurements etc. to character the polymer electrolyte and their properties. We observed a very large improvement of ion conductivity by adding appropriate content of dropping fillers.

Abstract: Lithium battery film on-line defect recognition system is realized based on industrial charge-coupled device (CCD) to improve quality. Otsu algorithm is adopted for threshold instead of traditional method. Area of defect is sorted to get the largest defect and geometry and projective is extracted from image. Film defects of lithium battery recognition is realized based on Brightness Judgment and One-against-all support vector machine (OAA-SVM). Experiment results show that these methods are effective and feasible, the accuracy can reach 90%.