中文核心期刊
中国科技核心期刊
中国化学与物理电源行业协会会刊
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20 July 2020, Volume 44 Issue 7
    

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  • A low-cost Ti felt anode gas diffusion layer for PEM water electrolysis
    FAN Zhi-xuan, YU Hong-mei, JIANG Guang, CHI Jun, SUN Shu-cheng
    Chinese Journal of Power Sources. 2020, 44(7): 933-936. https://doi.org/10.3969/j.issn.1002-087X.2020.07.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Mixed precious metal oxide coating was prepared on Ti felt by HCl etching and thermal decomposition, and used for anode gas diffusion layer (GDL) in proton exchange membrane (PEM) water electrolysis in this work. The surface of fiber was covered with micrometer scale tiny cracks and holes, and precious metal oxide grains grew on fibers. The electrochemical characterizations showed the Ti felt anode GDL feature in great OER catalytic activity. The usage of precious metal was only 2 mg/cm2 in the anode, and the single cell performance of 1.841 V@2 000 mA/cm2 has been achieved with this Ti felt anode GDL, which was better than contrast sample sintered porous Ti plate anode GDL. This work also explored the optimized thickness of Ti felt and the prepared method of membrane electrode assembly (MEA). The Ti felt anode GDL is featured with great conductivity, mechanical strength, chemical stability and anti-corrosion ability. The Ti felt anode GDL could decrease usage of precious metal and achieve low-cost hydrogen production.
    • Research and design
  • Simulation study on thermal stability of LiNixCoyMnzO2/C cells
    NING Fan-yu, WANG Song-rui, LIU Xing-jiang
    Chinese Journal of Power Sources. 2020, 44(7): 937-941. https://doi.org/10.3969/j.issn.1002-087X.2020.07.002
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    Thermal models of several kinds of LiNixCoyMnzO2/C cell were constructed by characterizing thermal properties of different LiNixCoyMnzO2 (NCM) materials. Comparison study of thermal stability of NCM/C cells was conducted by thermal simulation, which reveals that thermal stability of NCM materials as well as thermal runaway temperature of NCM/C cells decreases with the increase of Ni content. Thermal runaway mechanism was investigated, which shows that thermal runaway of NCM/C cells was triggered by thermal decomposition of NCM cathode. The NCM material with inferior thermal stability would decompose under lower temperature, and it resulted in the decrease of thermal stability of NCM/C cell.
  • Preparation and performance of LiNi0.5Co0.2Mn0.3O2 microspheres with porous interiors as cathode materials
    LI Wei-quan, LIU Geng-hao, WANG Qian, LIN Hong-jia, RUAN Ding-shan
    Chinese Journal of Power Sources. 2020, 44(7): 942-944. https://doi.org/10.3969/j.issn.1002-087X.2020.07.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The Ni0.5Co0.2Mn0.3(OH)2 precursor, which was composed of inner loose layer and outer compact layer, was synthesized by the controlled coprecipitation method. Then, the precursor was mixed with stoichiometric amounts of the LiOH. And then, the mixture was calcined by well-controlled heating rate. Finally, we obtained the LiNi0.5Co0.2Mn0.3O2 cathode materials with inner pores. XRD result shows that the as-prepared materials are well-crystallized. The result of the electrochemical performances shows that the initial discharge capacities of the materials are 175.1 mAh/g at 0.2 C, and the discharge capacity is reached at 157.3 mAh/g at 3 C. Besides, the materials achieve a high capacity retention rate of 96.2% at 2 C after 100 cycles. Based on this work, the present preparation strategy could provide an effective and general approach to improve the cycle stability and rate capability of cathode materials with porous interiors.
  • Research on application of graphene as conductive additive for cathode material of Li-ion battery
    ZHAO Yan-hong, WU Tao, ZHAN Xiang-lian, LIN Shuang, ZHAGN Zhi-peng
    Chinese Journal of Power Sources. 2020, 44(7): 945-947. https://doi.org/10.3969/j.issn.1002-087X.2020.07.004
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    With the addition of graphene in ternary cathode material, the effect of different type grapheme and additive amount on the performance of Li-ion battery was studied. When conductive agent consisted of 20% graphene and 2% Super P, the low temperature and high power discharge performance of the battery was the best. The SEM showed that the graphene dispersed more evenly on the surface and in the gaps of the ternary particles. The discharge capacity was 1 635.2 mAh at -20 ℃, and it could release 76.8% of the nominal capacity, which was 43.5% higher than that of the control group. The discharge capacity was 908.1 mAh at 10 C high rate, and it could release 42.6% of the nominal capacity, which was 76% higher than that of the control group.
  • Analysis of high temperature cycle attenuation mechanism of energy storage lithium ion battery
    WANG Wei-yuan, ZHU Huan, GAO Zheng-ping, LI Hu, LI Bing-jie
    Chinese Journal of Power Sources. 2020, 44(7): 948-951. https://doi.org/10.3969/j.issn.1002-087X.2020.07.005
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    The cycle performance and capacity decay mechanism of mesocarbon microbeads/graphite//LiNi0.3Co0.3-Mn0.3O2 energy storage lithium ion batteries at high temperature were investigated. The cycle performance test was carried by galvanostatic charge-discharge protocol. The relations between the potential and capacity for electrodes were analyzed with the differential capacity method. The electrochemistry properties of batteries and electrodes after different cycles were studied by EIS. The morphology and crystal structure of electrodes before and after cycles test were characterized by SEM and XRD. The results show that the capacity loss is attributed to the increased polarization resistance of the electrodes, which is related to the decrease of the diffusion kinetics due to the thickening of the negative SEI film and the shrinkage of the lattice during the cycling process. This study provides experimental basis and theoretical support for improving the performance of lithium ion battery.
  • Re-synthesis of LiFePO4/C from recycled cathodes via a phosphorus supplement route
    XIAO Wu-kun, ZHANG Hui, SUN Qi-fang, SONG Ji-shun
    Chinese Journal of Power Sources. 2020, 44(7): 952-956. https://doi.org/10.3969/j.issn.1002-087X.2020.07.006
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    A novel all-solid state route is designed to resynthesize LiFePO4/C materials from spent lithium ion batteries(LIBs). With this full-solid state route, a simple thermal treatment process is employed to purify and homogenize the recycled LiFePO4/C cathode materials. Further, the effect of P (NH4H2PO4) and thermal treatment temperature on the performances of regenerated LiFePO4/C materials is investigated. Among these resynthesized LiFePO4/C materials, the one with 650 ℃ shows relatively good physical and electrochemical performances. A new methodology for the resynthesis of LiFePO4/C materials has been developed.
  • Study of gas generation during storage at high temperature for lithium ion batteries with different voltage
    WANG Nian-ju, MENG Fan-hui, YU Li-wei, ZHOU Jiang, GAO Jin-hui
    Chinese Journal of Power Sources. 2020, 44(7): 957-960. https://doi.org/10.3969/j.issn.1002-087X.2020.07.007
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    Gas generation phenomena during storage at 70 ℃ for lithium ion batteries (LIBs) with different voltages are studied. The results show that with the decrease of the battery voltage, the gas generation on cathode decreases and the gas generation on anode increases, and the gas generation on anode of the low voltage (voltage ≤ 3.3 V) battery is much higher than that on anode of the high voltage (voltage≥3.5 V); the gas generation on cathode of the low voltage (voltage≤3.7 V) battery is less than that on anode. In addition, the XRD of the anode of the batteries with different voltages were analyzed. The results show that the anode below 3.3 V are almost in the state of complete lithium removal. At the same time, the composition of the gas generated by the anode of the battery with different voltage was analyzed by gas chromatography, which indicated that the gas was generated by the reduction reaction between the anode and the electrolyte. Combined with the results of high temperature gas generation measurement, XRD analysis and gas chromatography analysis, it is proved that the gas generation of lithium ion battery is mainly caused by the reaction of anode with the solution after oxidation and decomposition of SEI film under the condition of complete lithium removal, and the change of gas generation is related to the degree of lithium insertion.
  • Test of air self-heating device for power batteries
    WANG Fa-cheng, LI Chun-ming, GUO Qiang, WANG Ji-dong, ZANG Wei-hong
    Chinese Journal of Power Sources. 2020, 44(7): 961-963. https://doi.org/10.3969/j.issn.1002-087X.2020.07.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The performance of the power battery decreases under low temperature, so the battery can be heated quickly to normal temperature by the auxiliary means. Based on the heat transfer theory, a kind of self-heating device for power battery was designed. Through the bench test, a comparative study was made on the device's heating in the blowing mode, the suction mode, and the mixed mode of blowing and suction. The results show that the suction heating mode can achieve large temperature difference heat exchange with the highest heat exchange efficiency and the best heating effect, while the blowing heating mode has the lowest heat exchange efficiency and the worst heating effect. It is suggested that the suction mode is selected preferentially for the self-heating device of the power battery.
  • Study on performance evolution of power battery after crushing mechanical damage
    SUN Zhi-peng, CHEN Li-duo, BU Xiang-jun, LIU Peng, LIU Shi-qiang
    Chinese Journal of Power Sources. 2020, 44(7): 964-966. https://doi.org/10.3969/j.issn.1002-087X.2020.07.009
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    As an important energy storage unit of electric vehicles, power batteries have become the key to the safety of electric vehicles. In this paper, a ternary system of square lithiumion cell is taken as the research object. Through artificial manufacturing of single cell crushing mechanical damage, the scene of single cell damage in vehicle battery system caused by impact, impact and other factors is simulated. The safety performances of overcharge, overdischarge and short circuit before and after damage are compared, and the experimental results of electrical performance in room temperature and high temperature are studied. The performance evolution of the power battery after mechanical damage is studied to provide support for vehicles field. The results can also provide relevant data reference for the residual value evaluation of used car vehicles.
  • Investigations on rare earth alloy in industrial lead-acid battery
    YANG Bao-feng, CAI Xian-yu, LI En-yu, ZHANG Yang, YIN Ge-ping
    Chinese Journal of Power Sources. 2020, 44(7): 967-969. https://doi.org/10.3969/j.issn.1002-087X.2020.07.010
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    The application of rare earth alloy Pb-Ca-Sn-Al-La in the positive grid of lead-acid battery was studied. The effects of microscopic and electrochemical properties of rare earth alloys were investigated by metallographic, cyclic voltammetry, alternating current impedance and constant current corrosion tests. Besides, the effect of rare earth alloy on capacity and life of industrial lead-acid battery was studied. The results show that the addition of lanthanum in the alloy can refine the grain size, and improve the electrical conductivity of the alloy corrosion layer, which can effectively improve the battery capacity and deep cycle performance. However, the corrosion rate of rare earth alloys is accelerated, which promotes the growth and creep of the grid and affects the cycle life of the battery.
  • Experimental study on the degradation of the molten carbonate fuel cell cathode
    LU Cheng-zhuang, CHENG Jian, ZHANG Rui-yun, LI Hao, XU Shi-sen
    Chinese Journal of Power Sources. 2020, 44(7): 970-971. https://doi.org/10.3969/j.issn.1002-087X.2020.07.011
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    Molten carbonate fuel cell (MCFC) is one of clean and high efficiency power generation technology. The life of fuel cell is affected by the cathode dissolution. In this study, the scanning electron microscopy (SEM) was carried out to analyze the nickel oxide (NiO) of MCFC cathode after operation. The results show that cathode nickel oxide (NiO) dissolved with the precipitation of Ni. It was found that there are small pin-sized holes on the surface of porous NiO material. The increase of carbon dioxide concentration leads to the dissolution of cathode NiO and precipitation of Ni, resulting in nickel short circuit and power decrease in the fuel cell. The mechanism of cathode dissolved in molten carbonate fuel cells is also analyzed and discussed.
  • Structure analysis of cathode flow field of micro PEMFC based on COMSOL
    WANG Hong, ZHANG Zhao-yang, ZHU Hao, ZHAO Dou-yan, ZHOU Yun-shen
    Chinese Journal of Power Sources. 2020, 44(7): 972-975. https://doi.org/10.3969/j.issn.1002-087X.2020.07.012
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    A model of serpentine flow field structure of micro high temperature proton exchange membrane fuel cell is established and analyzed by using COMSOL software, which couples the mass conservation equation model, momentum conservation equation and an electrochemical reaction equation. By solving the model, parameters like current density, voltage and power density are obtained to calculate and analyze the effect of the cathode flow field microchannel size parameter on the cell performance. The result shows that a better performance of the battery can be achieved in the effective reaction area of 8 mm×8 mm with a flow channel width of 600 μm, depth of 400 μm and a rib width of 400 μm.
  • Performance analysis of variable cross section straight channel fuel cell
    CAO Ai-hong, ZHAO Bao-hua
    Chinese Journal of Power Sources. 2020, 44(7): 976-979. https://doi.org/10.3969/j.issn.1002-087X.2020.07.013
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    The performance of 10 kinds of proton exchange membrane fuel cells (PEMFC) with different cross sections was simulated and analyzed by CFD software. Under the same operating conditions, the pressure distribution characteristics, water distribution characteristics, gas distribution characteristics and electrochemical characteristics of 10 kinds of channels were compared and analyzed, and the variation of each performance with the cross section structure of the channel was explained in detail. Simulation results show that the V-channel has the best performance in all aspects, which can ensure reasonable pressure drop, effectively discharge the liquid water generated by the reaction, and make the gas more evenly distributed in the diffusion layer, thus ensuring the improvement of the performance of PEMFC. In addition, The maximum power density of V-channel PEMFC is 12.2% higher than that of normal cross section PEMFC. The simulation results have certain guiding significance for the design and optimization of PEMFC channel.
  • Study on the preparation of electrode-bipolar plate for non-separator static zinc-bromide battery
    SHEN Kai-yun, WANG Xue-hua, LU Miao-miao, WANG Hao, WANG Qiang
    Chinese Journal of Power Sources. 2020, 44(7): 980-982. https://doi.org/10.3969/j.issn.1002-087X.2020.07.014
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    A static zinc-bromide battery without separator has been designed by using novel electrode-bipolar plate and evaluated for application in the zinc-bromide battery. It consists of three parts: titanium plate (bipolar plate) with titanium carbide, conductive adhesive layer and graphite felt (electrode). The bipolar plate and the electrode are thermally bonded together to the assembly through a conductive adhesive layer. The applicability of this new type of electrode-bipolar plate in non-separator static zinc-bromide batteries was proved by evaluating the performance of bulk resistivity and others in batteries. Charging and discharging tests of the stack by battery testing system show that the coulomb efficiency of the stack can reach 83% and the cycle performance is good, which further proves the application prospects of the module in zinc-bromide batteries.
  • Fractional order modeling and state-of-charge estimation of lithium batteries
    LI Jing, YANG Yan, QIN Jian-xin, ZHAO Ya-zhou, ZHOU Wan-peng
    Chinese Journal of Power Sources. 2020, 44(7): 983-985. https://doi.org/10.3969/j.issn.1002-087X.2020.07.015
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    Based on the fractional order calculus theory and the fact that the actual capacitance is fractional order in nature, the integer order modeling will lead to algorithm imprecision. Therefore, in order to solve this problem, the fractional order PNGV equivalent circuit model of lithium battery was established and analyzed theoretically, and the parameters of the model were identified through the hybrid pulse power characteristic test (HPPC). The discrete state equation and measurement equation were established for the model. The fractional order Kalman filter (FOKF) algorithm was used to predict the battery state of charge (SOC), and the results were compared with the unscented Kalman filter (UKF) algorithm and the experimental reference values. The results show that the established fractional order model can simulate the polarization effect and charge-discharge characteristics of the battery more realistically, and the constructed FOKF algorithm also has a certain improvement in estimation accuracy and tracking speed.
  • Research on active equalization for series connected battery module used in battery energy storage systems
    YU Liang-hui, WANG Zhi, YANG Dong-mei, JI Yong-chao
    Chinese Journal of Power Sources. 2020, 44(7): 986-990. https://doi.org/10.3969/j.issn.1002-087X.2020.07.016
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Series connected batteries are widely used in many fields such as electric vehicles and energy storage stations. The power and capacity performance of battery pack declines after long-term operation, owing to the differences in manufacturing process and operating environment. Therefore, a bidirectional active equalization system is proposed for the series connected battery module of the energy storage system. The system includes series connected battery module, switch array, active equalization DC/DC converter, battery information acquisition unit, etc. The basic working principle and control process of the equalization circuit are analyzed. The bidirectional equalization experiments are carried out on a battery pack built by 16 batteries. The equalization results show that the maximum SOC difference is reduced from 40% to 1.1% after equalization, which proves the feasibility and effectiveness of the equalization system.
  • Battery SOC estimation based on moving horizon estimation EKF algorithm
    LI Ling-feng, TAO Jin-yi, ZHANG Fu-qiang
    Chinese Journal of Power Sources. 2020, 44(7): 991-994. https://doi.org/10.3969/j.issn.1002-087X.2020.07.017
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    Extended Kalman Filter (EKF) is an effective tool for analyzing battery SOC estimation and has good results for nonlinear systems. However, under actual conditions, the model for measuring noise is no longer a zero-mean white noise, resulting in a large error in the prediction results. In this paper, the Moving Horizon Estimation (MHE) algorithm is combined with the extended Kalman filter algorithm, and the idea of rolling time domain window is used to synthesize the window information of the first N times to estimate the current SOC. By establishing the arrival function and adding the M-estimator to replace the measurement error, the prediction problem is transformed into the optimization problem, and the approximate optimal solution is given according to the idea of EKF. Experimental simulations show that the algorithm can effectively improve the estimation accuracy of SOC.
  • Aging estimation for LFP battery using neural network based on dominant region
    SHI Qiong-lin, ZHU Guo-rong, CHEN Ya, KANG Jian-qiang
    Chinese Journal of Power Sources. 2020, 44(7): 995-998. https://doi.org/10.3969/j.issn.1002-087X.2020.07.018
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    The estimation of battery aging is a hot topic in the field of battery research. Neural network used to predict the aging of lithium ion battery has a broad application prospect. However, the establishment of neural network model is often lack of the study on battery aging mechanism, so it cannot be applied online since it not only needs a lot of experimental data, but also needs complete charge and discharge to establish the model. This paper proposes a method for predicting battery aging based on negative dominant region of lithium iron phosphate battery. The negative dominant region of lithium iron phosphate battery contains much aging information. Through the establishment of neural network model in the negative dominant region, combined with short phase step discharge experiment, the online prediction of battery capacity can be realized, and the average error is lower than 2%.
  • Insulation battery pack design based on CFD and finite element analysis
    WANG Kun, JIANG Chun-yang, SUN Qian-qian, YUAN Zhuo-wei, JI Zeng-xiang
    Chinese Journal of Power Sources. 2020, 44(7): 999-1002. https://doi.org/10.3969/j.issn.1002-087X.2020.07.019
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    In order to solve inevitable thermal bridge problem in the process of thermal insulation design in battery pack, the glass fiber 3D fabric was used to completely cover the inside of the battery pack, and the fabric was integrated with the external metal frame through infiltration resin. The test proves that the expected heat preservation effect can be achieved. Based on the theory of heat transfer, combined with CFD simulation analysis, the insulation performance of the battery pack was calculated. The later experiments prove the validity of theoretical calculation and simulation results. The finite element analysis was used to check the strength of the battery pack. This solution can fully meet the requirements of extrusion and mechanical impact.
  • Research on high efficiency equalization method of Li-ion battery based on coupling inductance
    MO Jian-ping, LAN Hai-jiang
    Chinese Journal of Power Sources. 2020, 44(7): 1003-1004. https://doi.org/10.3969/j.issn.1002-087X.2020.07.020
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    A coupling inductor equalization method is proposed to build a more simple, efficient and economical circuit for lithium ion battery pack of electric vehicle. For eight series cell equalization, four inductors and eight N-channel MOSFETs are selected, which are controlled by a pair of complementary signals in the synchronous trigger mode. In this paper, the theoretical derivation of the circuit is given, a complete equalization circuit is established, and the simulation and experimental verification of the equalization process are carried out to verify the effectiveness of the equalization circuit. Because of the use of inductor based equalization method, this scheme is suitable for fast equalization. Compared with the conventional inductor based equalization technology, this topology has the advantages of less components and fast equalization.
  • Research on continuous airworthiness performance test of aviation Ni-Cd battery
    FENG Shuai, REN Ren-liang
    Chinese Journal of Power Sources. 2020, 44(7): 1005-1008. https://doi.org/10.3969/j.issn.1002-087X.2020.07.021
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    Aviation battery is the airborne equipment that transport aircraft must install. Its airworthiness is of great significance to ensure the safety of aircraft emergency power supply. The continuous airworthiness standards of aviation Ni-Cd battery were studied, and a battery performance testing platform was developed. According to the continuous airworthiness standards, the Saft battery 40176-7 and the Marathon battery CA-727-20 were tested. The results show that the capacity of Saft battery was 100% of the rated capacity. The opening pressure of the vent valves were between 27.6 and 41.4 kPa. The temperature sensors work normally, so the battery meets the continued airworthiness standards. The capacity of Marathon battery and the vent valves had not passed the test and need airworthiness maintenance.
  • Research on battery management system control strategy of deep-sea human occupied vehicle
    HE Wei-wei, SONG De-yong, YANG Shen-shen, ZHANG Wei, ZHENG Peng
    Chinese Journal of Power Sources. 2020, 44(7): 1009-1011. https://doi.org/10.3969/j.issn.1002-087X.2020.07.022
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    In order to ensure the safety performance of lithium ion battery, the battery management system must be used for monitoring and managing in the application. In this paper, the control strategy of the battery management system used in deep-sea human occupied vehicle is studied. In this paper, the key technology of control strategy applied to the 4500-meter "deep sea warrior" battery management system is discussed from two aspects of hardware architecture and software strategy. The sea trial shows that the control strategy is reliable and accurate.
  • Double closed-loop control strategy for battery discharge regulator
    LU Wei
    Chinese Journal of Power Sources. 2020, 44(7): 1012-1014. https://doi.org/10.3969/j.issn.1002-087X.2020.07.023
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    To ensure the steady and dynamic performance of the battery discharge regulator (BDR), a double closed-loop control strategy is proposed for the BDR, which based on the topology of the stacked phase-shift full-bridge. According to the BDR working principle, the small-signal mathematic model and transfer function are obtained. Then the control strategy with voltage outer-loop and current inner-loop is proposed. The main-bus voltage regulation stability and fast tracking capability for the dynamic load are ensured. The effectiveness of the proposed control strategy is verified by simulation results.
  • A method to minimize the ripple of linear stabilized power supply
    WANG Zi-hua, ZHANG Tao, CHEN Li-sheng
    Chinese Journal of Power Sources. 2020, 44(7): 1015-1016. https://doi.org/10.3969/j.issn.1002-087X.2020.07.024
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    The ripple is one of the most important parameters of a voltage-stabilized power supply. Here, using a classic linear voltage-stabilized power supply (WZ-12) as an example, we analyze a mechanism of the ripple voltage, which cannot be eliminated by filtering capacitors at the output. The ripple voltage is effectively suppressed after adjustment on the circuit board. For reducing ripple voltage, general guidance on the layout of the circuit board of power supplies and precision electronic instruments is summarized at the end.
  • Design of PV micro-grid monitoring system based on LabVIEW
    ZHANG Wen-ling, YANG Ying, MAO Ya-feng, YANG Yan-jie
    Chinese Journal of Power Sources. 2020, 44(7): 1017-1020. https://doi.org/10.3969/j.issn.1002-087X.2020.07.025
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    A set of remote real-time monitoring system is designed by using LabVIEW, SQL server and Android studio as software development tools and school optical storage micro network experimental device as hardware platform. The system realizes data communication with monitoring host computer network through TCP/IP protocol, data management through SQL serverl database, remote access to data through internal and external networks through web publishing, and mobile data monitoring through Android Studio development of mobile App. Through the man-machine interface of the system, we can monitor the basic parameters of the optical storage microgrid equipment in real time, judge the operation status of the optical storage microgrid equipment effectively, and provide reliable data support for the microgrid research, which has great promotion and practical value.
  • Research on coordinated control strategy of photovoltaic power generation in highly dispersed areas
    LI Ze-wen, ZHAO Wei, ZHAO Xiong, WANG Yang-fan, LI Wen-jiao
    Chinese Journal of Power Sources. 2020, 44(7): 1021-1026. https://doi.org/10.3969/j.issn.1002-087X.2020.07.026
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    With the promotion of national policies, the promotion and use of renewable distributed energy is an important development direction of China's energy development. Residents in highly decentralized areas can reasonably use local geographic conditions to install distributed power generation systems to generate electricity, which can effectively create economic benefits while ensuring their own power quality. In this paper, the current generation technology of distributed photovoltaic power generation systems and the problems of user-side load management are discussed. It is analyzed the impact mechanism of photovoltaic and energy storage access on the power grid, and the electricity consumption patterns of residents in highly decentralized areas. Based on the corresponding mathematical analysis model, the coordinated control of generation-storage-use in highly decentralized areas was achieved and the effective consumption of photovoltaic power was guaranteed.
  • Grounding analysis of photovoltaic power station with DC step-up collection system
    XI Xin-ze, HUANG Wen-tao, ZHANG Er-jia, TAI Neng-ling
    Chinese Journal of Power Sources. 2020, 44(7): 1027-1031. https://doi.org/10.3969/j.issn.1002-087X.2020.07.027
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    With the development of flexible DC transmission technology and DC protection technology, photovoltaic power station with DC step-up collection system has been gradually researched and applied. The photovoltaic power station with DC step-up collection system consists of a high-ratio DC/DC converter, a DC/AC converter, and a DC line. However, the grounding method of the PV DC step-up collection system has not yet formed a unified standard. Based on the DC system with multi-type converters and the topology of the DC step-up collection system, the paper analyzes the characteristics of the high-frequency transformer, the neutral point of the double-ended DC transmission unit, the filter and the grounding of the boost isolation transformer. Then, a method for selecting and determining the grounding mode of the PV DC step-up collection system is proposed, and the grounding schemes are verified by the theoretical analysis and simulations. By analyzing the fault characteristics, it can be seen this method can improve the rationality and reliability of grounding mode selection.
  • Performance analysis of transparent grid back sheet for photovoltaic module
    ZHANG Yin-huan, LI Yuan-yuan, MIAO Lin, TANG Lan-lan, JIANG Qian
    Chinese Journal of Power Sources. 2020, 44(7): 1032-1034. https://doi.org/10.3969/j.issn.1002-087X.2020.07.028
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    In this paper, transparent grid back sheets of the same structure produced by manufacturers A and B are selected as analysis samples. The main factors as the elongation retention of breakage of the transparent grid back sheet after wet heat, and the yellowing of the back sheet region after exposure to different ultraviolet irradiation amounts, thermal stability, light transmittance, and water vapor transmission rate performance are tested and analyzed.
  • MPPT control algorithm based on power difference variable step-size disturbance observation method
    LIU Qiu-hua, ZHANG Xiu-jin, FAN Chen
    Chinese Journal of Power Sources. 2020, 44(7): 1035-1039. https://doi.org/10.3969/j.issn.1002-087X.2020.07.029
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    Aiming at the problems that the existing variable step-size disturbance observation method has a complex influence on the response speed and the environment adaptation range in the model, a variable step-size disturbance observation method based on the power difference is proposed. Starting from the mathematical model of photovoltaic power generation, a theoretical derivation of the algorithm was performed, which proved the advantages of power control in response speed and adaptation range. Through simulation, the algorithm is compared with fixed step-size, variable step-size, and fuzzy control method to verify the performance of the algorithm. The algorithm proposed in this paper is easy to implement and it can provide a reference for the maximum power control of photovoltaic systems in the future.
  • A high gain DC-DC converter for PV cell power system
    WU Jing-mei, JI Ping, WANG Xiao-ping
    Chinese Journal of Power Sources. 2020, 44(7): 1040-1044. https://doi.org/10.3969/j.issn.1002-087X.2020.07.030
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    According to the characteristics of low input and high output of photovoltaic cell micropower, a new high-gain DC-DC converter based on the conventional staggered Boost converter was investigated. This converter has the advantages of raising the voltage gain,and lowing voltage stress of the switching power device. Moreover, the current ripple was reduced, which was beneficial to the selection of switching devices and reduced the loss of the circuit. The operational principle of the circuit, the mathematical model of the converter and the steady-state analysis were discussed in detail in this paper. Finally, the correctness and feasibility of theoretical analysis were verified by simulink simulation.
  • Parameter design of resonant network for CLLLC bidirectional resonant converter
    XU Guo-kai, LIU Xu
    Chinese Journal of Power Sources. 2020, 44(7): 1045-1049. https://doi.org/10.3969/j.issn.1002-087X.2020.07.031
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The resonant network parameters of CLLLC bidirectional resonant converter played an important role in the performance of the converter. The harmonic approximation analysis method was used to model the converter. The alternating voltage gain, transmission efficiency and zero voltage on condition of the converter were taken as three constraints for the selection of resonance network parameters. A simple and efficient design method of resonance network parameters was derived. An experimental prototype was designed and manufactured to realize the zero voltage switching of switching MOSFET and the zero current switching of the parasitic diode. The maximum efficiency of the bidirectional operational mode can reach to 95%. The experimental results verify the feasibility of the proposed design method.
  • Power switch stress analysis of resonant reset forward circuit
    WU Rong, LI Bin, RONG Yan
    Chinese Journal of Power Sources. 2020, 44(7): 1050-1053. https://doi.org/10.3969/j.issn.1002-087X.2020.07.032
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The characteristic impedance and frequency of the resonant reset circuit affect the reliability of the power supply. This paper describes the working states of the drain-source voltage, working current, field current and reset voltage of the transformer in five working modes of the circuit in details. Saber software is used to analyze the voltage stress and the working state of the switch under different working conditions. The correctness of the analysis is verified by the design and test of an example.
  • A wireless power transfer system based on secondary side power regulation
    WU Xin-jie, SU Jian-hui, ZHANG Jian
    Chinese Journal of Power Sources. 2020, 44(7): 1054-1057. https://doi.org/10.3969/j.issn.1002-087X.2020.07.033
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Aiming at the power control problem of the wireless power transmission system, a secondary side power control circuit is used, and the characteristics of the circuit are studied. Firstly, the power regulation circuit model based on secondary side active rectifier is established and the working mode of the circuit is described in detail. Then, the relationship between the output power of the system, the secondary side reflection impedance, the primary input impedance and the duty ratio is analyzed. Finally, a prototype was made, and the correctness and feasibility of the scheme were verified by simulation and experiment.
    • Review
  • Research progress of SnO2 as anode materals for lithum ion battery
    GUO Shi-quan, WU Yun-xuan, LI Xin-jie, JI Shi-jun, WANG Xin-yu
    Chinese Journal of Power Sources. 2020, 44(7): 1058-1061. https://doi.org/10.3969/j.issn.1002-087X.2020.07.034
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    SnO2 is considered to be one of the most promising anode materials due to its high theoretical capacity and abundant reserves. However, the poor conductivity and cycle stability of SnO2 limit its application and development. The research mainly focuses on the preparation of nanostructures and composite materials. The research progress from zero-dimensional to three-dimensional nanostructured, SnO2 with carbon materials and metal oxide composites is reviewed, and its application prospects are prospected.
  • Research progress of cathode materials for potassium ion batteries
    HUANG Zhao, ZHANG Ming, DING Shuang-shuang
    Chinese Journal of Power Sources. 2020, 44(7): 1062-1065. https://doi.org/10.3969/j.issn.1002-087X.2020.07.035
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Owing to the abundant resources and low cost of potassium, as well as the similar working principle with lithium ion batteries, potassium ion batteries are expected to be an important alternative in large scale energy storage market. In this paper, the current research status of cathode materials for potassium ion batteries is systematically described, including Prussian blue analogues, layered metal oxides, polyanionic compounds and organic crystals. However, each of them has its own characteristics. In order to avoid the adverse effects on potassium storage performances arisen from inherent defects, rational modification measures should be taken. Some common approaches for the above four cathode materials are summarized in this paper, such as nanocrystallization and pore-creating, carbon coating, doping process and so on.
  • Recent development on the durability influencing factors and life testing methods of proton exchange membrane fuel cell
    HE Feng, NI Jiang-peng, DENG Yu-fei, YANG Han
    Chinese Journal of Power Sources. 2020, 44(7): 1066-1069. https://doi.org/10.3969/j.issn.1002-087X.2020.07.036
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Proton exchange membrane fuel cell(PEMFC) is an efficient and clean new energy technology and is considered to be one of the most important development directions for future energy. However, the short life of fuel cells is one of the important factors hindering the commercialization of fuel cells. In this paper, the recent research progress on the durability of PEMFC were summarized, especially focused on the factors related to the durability of the key components including catalyst layer, gas diffusion layer, and proton exchange membrane. The life test methods such as driving cycle, start/stop switches, cyclic voltammetry, humidity cycle were also deeply elaborated in this paper.
  • Analysis of thermal diffusion test for traction battery
    LIU Lei, LIN Chun-jing, FAN Bin, WANG Fang, YANG Pei-xia
    Chinese Journal of Power Sources. 2020, 44(7): 1070-1072. https://doi.org/10.3969/j.issn.1002-087X.2020.07.037
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    New energy vehicle fire accidents occur frequently with the wide application of new energy vehicles, and many accidents occur during the normal driving or parking. These accidents have great unpredictability and safety risks. The main purpose of the traction battery thermal propagation test for electric vehicles is to verify whether the electric vehicle or the battery system can effectively protect the occupants' safety or safe escape when the battery cell is out of control and thermal runaway is happened. In this paper, the objectives, domestic and international standards and regulations, and research progress of thermal propagation test are analyzed and introduced, and the future research direction based on thermal propagation is proposed.
  • Research progress on high-efficiency perovskite solar cells and industrialization
    YI Wei
    Chinese Journal of Power Sources. 2020, 44(7): 1073-1075. https://doi.org/10.3969/j.issn.1002-087X.2020.07.038
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Perovskite material, as one of the research hot spots in the field of solar cell, has experienced rapid development in the past decade. Due to its advantages of continuous adjustable band gap, light weight, flexibility, simple preparation process and low equipment cost, it has broad application prospects in many fields. In this paper, the main characteristics of perovskite, the latest research progress and the related industrialization progress are summarized systematically, and its specific application prospect and potential application market are prospected.
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