Beijing Electrical Vehicle Co.

Caihe, China

Beijing Electrical Vehicle Co.

Caihe, China
Time filter
Source Type

Cai S.,Beijing Electrical Vehicle Co.
Journal of Manufacturing Science and Engineering, Transactions of the ASME | Year: 2017

In this work, a research on double-direction pressure distributions (DDPD) induced by vaporizing a single metal foil was conducted. The shock pressure in the up direction revealed the same amplitude as that in the down direction. Based on a comparison of pressure amplitudes between double-direction pressure distributions (DDPD) and single-direction pressure distributions (SDPD), the pressure upward in DDPD was found to be smaller than that in SDPD. In addition, an approach to vary the pressure amplitudes in the up and down directions in DDPD was introduced. Using polyurethane plates in different thicknesses leads to various pressure amplitudes on both sides of the foil specimen. Finally, the application of DDPD in metal forming process was examined. A profile forming part with two bulging zones was successfully manufactured. © 2017 by ASME.

Xue N.,Beijing Jiaotong University | Sun B.,Beijing Jiaotong University | Bai K.,China Electric Power Research Institute | Han Z.,Beijing Electrical Vehicle Co. | Li N.,China Electric Power Research Institute
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2017

In this paper, the different state of charge range cycle degradation mechanism of composite material lithium-ion batteries (LiMn1/3Ni1/3Co1/3O2+LiMn2O4, 35A·h) is presented. According to the distribution of incremental capacity (IC) curve peak, The SOC range was divided falls according to the distribution of incremental capacity (IC) curve peak into four areas, i.e. 0%~20%, 20%~60%, 60%~100%, and 0%~100%. Cycle degradation experiments were carried on batteries in different each SOC ranges. In order to ensure the consistent throughput of each cycle range, 600 experiments on charging and discharging cycles were conducted at 40℃ with 2C on the basis of total range. The incremental capacity analysis (ICA) performance test was performed at room temperature with C/20 from the starting point for 100-cycle interval. Thereafter the degradation mechanisms of batteries in different SOC ranges were analyzed. The results show that the fastest recession is found in the SOC total range during charging or discharging, and low SOC range declines slowly. The performance degradation between low and medium range is mainly caused by active lithium-ion loss, and high SOC range also includes loss of the active materials and kinetic hindrance. The conclusions can provide theoretical basis for improvements of the battery design and selection of the using range of batteries. © 2017, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

Sun Q.,Tianjin Agricultural University | Wang S.,Beijing Electrical Vehicle Co. | Lu H.,Tianjin University | Liang B.,Tianjin University | Wei K.,Tianjin University
Gaodianya Jishu/High Voltage Engineering | Year: 2017

Long power transmission line can lead to voltage pulse wave reflection and exceed electromagnetic compatibility limits for power electronics device and system. For accurate prediction of rectifier's electromagnetic interference, the establishment of a cable model is the key to reflect transmission features. The lumped parameter based S. Kim model can not exactly describe inherent high-frequency characteristics of transmission line, considering the influences of frequency parameter variation and skin effect on conductor's current distribution density. To achieve accurate parameter identification of the wideband parasitic model, the equivalent circuit based on the "N-Branch" theory is employed. Thus accurate prediction model and stable convergence are obtained, and this effective approach provides a theoretical basis for EMC research of power rectifier. Finally, calculation and experimental results of conducted interference with the proposed modeling method are almost the same at low frequencies, and there is only about 5 dB estimation deviation at high frequencies, which verifies its feasibility and correctness. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Meng H.,Beijing Institute of Technology | Ran L.,Beijing Institute of Technology | Chen J.,Beijing Electrical Vehicle Co. | Jiao Z.,Beijing Institute of Technology
Energy Procedia | Year: 2017

Electric vehicles (EVs) play an important role in the automobile market in recent years. And carsharing system is increasingly attracting people's attention. It's a sustainable and innovative solution to solve transportation issues. Ride-sharing is a car (EVs) service which a person can use a third-party software to arrange a ride. Electric vehicles ride-sharing plays a prime role in shared service because of its environment friendly attributes. Especially, EVs ride-sharing systems offer a high level of travel experience because they provide users with fast and convenient service. In addition, users who participate in the EVs ride-sharing system would share rides to save time and money, and reduce environmental impacts. User matching mechanism is one of the important research issues in EVs ride-sharing system. The current user matching mechanism in EVs ride-sharing system is mainly in the perspective of one single subject, such as the government or rental operators. However, in reality, the EVs ride-sharing mechanism needs to be optimized with multi perspective. We will establish a multi-objective dynamic user matching mechanism in the context of the shared service model in Beijing City. In this mechanism, we consider multi objectives and utilize time windows as constraints which represent customers' preference. So as to further improve the EVs ride-sharing services and enhance the operational efficiency of shared services model. © 2017 The Authors.

Jiao Z.,Beijing Institute of Technology | Ran L.,Beijing Institute of Technology | Chen J.,Beijing Electrical Vehicle Co. | Meng H.,Beijing Institute of Technology | Li C.,Beijing Institute of Technology
Energy Procedia | Year: 2017

Electric vehicles (EVs) has been a main component of car sharing market because of their environment friendly attributes. However, imbalance and range anxiety, as frequent problem in traditional one-way EVs sharing system, make a poor operation sometime. For perform a practical one-way car sharing system, considering the special attributes like charging demand, charging modes and range anxiety resulting from limited battery volume about EVs, we propose a mixed integer programming(MIP) model to satisfy the demand generated by customers who change reserved drop-off station. Moreover, we address the location problem with the allocation of two types of charging piles to meet the different types of demand (i.e. the fast charging mode meet the urgent rent demand). Further, we make a numerical study combining practical data collected in Beijing with practical data to decide operation variables above for one-way car sharing system. We find that preference has an influence on the depots location and fleet size of the one-way EVs sharing system. © 2017 The Authors.

Gao X.,Beihang University | Gao X.,Beijing Electrical Vehicle Co. | Su D.,Beihang University | Li Y.,Beijing Electrical Vehicle Co.
2015 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015 | Year: 2015

Electric Vehicle (EV) is driven by electromotor, whose power comes from vehicle power battery. The advantage of the EV is the mechanical simplicity of the drivetrain, but the electromagnetic interference (EMI) is a difficult problem to solve. This paper first describes the electromagnetic interference (EMI) phenomenon generated by one kind of DC/DC converter, Then analyses the reason of the EMI, and finally puts forward the design optimization direction of EMC from the vehicle. © 2015 IEEE.

Xiang J.,Beijing Institute of Technology | Xiang J.,Beijing Electrical Vehicle Co. | Wu F.,Beijing Institute of Technology | Chen R.,Beijing Institute of Technology | And 2 more authors.
Journal of Power Sources | Year: 2013

Novel binary electrolytes based on ionic liquid (N-butyl-methyl piperidinium bis(trifluoro-methylsulfonyl)imide, PP14-TFSI) and sulfone (tetramethylene sulfone, TMS) have been prepared and examined for use in lithium-ion batteries. The addition of sulfone is expected to improve the lithium salts solvability, ionic conductivity and electrode compatibility of the ionic liquid greatly. More importantly, the addition of sulfone is not expected to deteriorate the peculiar properties of the ionic liquid, such as the wide electrochemical window and non-flammability. Experimental results have shown that the reversible discharge capacities of the Li/LiFePO4 half-cell, which contains a 0.5 M LiTFSI/(60%) PP14-TFSI/(40%) TMS mixed electrolyte at a current density of 0.05 C and 1 C, can reach up to 160 and 150 mAh g-1, respectively, which are much higher than the discharge capacity achieved using the pure ionic liquid electrolyte under the same conditions. Furthermore, lithium difluoro(oxalato)borate (LiDFOB) has been found to have positive effects on the battery performance of the mixed electrolytes. The 0.5 M LiDFOB/(60%) PP14-TFSI/(40%) TMS mixed electrolyte exhibits better compatibility with the Li1.2Ni0.2Mn 0.6O2 cathode than conventional electrolytes, where an initial discharge capacity of 255 mAh g-1 is obtained and a stable capacity of above 230 mAh g-1 is retained after 30 cycles. © 2013 Elsevier B.V. All rights reserved.

Yu H.,Beijing Electrical Vehicle Co. | Sheng J.,Beijing Electrical Vehicle Co. | Wang Y.,Beijing Electrical Vehicle Co.
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

This paper presents a method to optimize the on-board energy system of electric vehicle in the aspect of electro-load characteristics. LiMn2O4 Battery (14.8V 100Ah) is used as low voltage energy system instead of the original lead-acid battery (12V 70Ah). The power battery system is divided into two parts, which are placed under the vehicle chassis and in the car trunk, respectively. The power battery system and low voltage energy system can be charged with the on-board charger. The low voltage battery charging is also optimized by solar cell in order to save energy. © 2014 IEEE.

Sun B.,Beijing Jiaotong University | Jiang J.,Beijing Jiaotong University | Han Z.,Beijing Jiaotong University | Han Z.,Beijing Electrical Vehicle Co. | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

Lithium power battery is usually impacted by low temperature in a particular situation, and its low temperature stress is different with that in initial condition. Taken 35 Ah composite battery as an example, work range of the battery was divided by the transformation curve of the incremental capacity analysis based on different reaction stages of battery charging and discharging process. By aging the batteries at different SOC range, this paper traced the changes of electrochemical properties and analyzed degradation mechanism. Under 0℃ environment, the stress differences under low temperature of batteries which were degraded through different paths, was analyzed using C/3, 1C, 3C/2, 2C and 5C/2 currents to impact the aging cells by charging and discharging respectively. The result showed that the power battery produced obviously different degradation paths when it cycled at different SOC ranges. There is no mapping relation and consistency between low temperature degradation and cycling degradation. The conclusion provides the basis for battery pack lifetime analysis and second battery matching. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

Zhou X.,University of Technology, Sydney | Walker P.,University of Technology, Sydney | Zhang N.,University of Technology, Sydney | Zhu B.,Beijing Electrical Vehicle Co. | Ruan J.,University of Technology, Sydney
SAE Technical Papers | Year: 2014

This paper mainly studies the power losses in a refined two-speed dual clutch transmission which is equipped in a electric vehicle test rig. Both numerical and experimental investigations are carried out. After theoretical analysis of the power losses original sources, the developed model is implemented into simulation code to predict the power losses. In order to validate the effectiveness of the proposed model, results from experimental test are used to compare the difference the simulation and test. The simulation and test result agree well with each other. Results show that the power losses in the two-speed are mainly generated by multi-plate wet clutch drag torque and gear churning loss. Copyright © 2014 SAE International.

Loading Beijing Electrical Vehicle Co. collaborators
Loading Beijing Electrical Vehicle Co. collaborators