Papers by Keyword: Battery Pack

Abstract: In this study, reduction of cogging torque and torque ripple for an exterior rotor type brushless dc (BLDC) motor for an automotive cooling device were proposed and a design concept for a fan motor for use in a battery pack mounted in an electric vehicle/hybrid electric vehicle (EV/HEV) was presented. Various pole/slot combinations and permanent magnet (PM) pole arc ratios were compared using finite element analysis (FEA), and the PM overhang ratio necessary to sufficiently increase the magnetic flux that enabled coil linkage was determined through 3D FEA. Based on the analysis results, an actual model was produced, experimentally verified, and used to validate the proposed design model.

Abstract: In order to estimate the state of health (SOH) of each cell in the battery pack, polarization resistance and ohmic resistance were analyzed in the aging process of the battery pack. Accelerating aging test for the battery was done, quantitative relationship between the ohmic resistance and the capacity aging was obtained, a method of relative state of health (RSOH) evaluation was proposed accordingly, Experiments on the LiFePO4 battery pack which is connected in series by 100 cells have been taken, the experimental results show that the evaluation method of RSOH can evaluate the cells SOH accurately and is not limited by the operating conditions.

Abstract: This article presents some research of welding methods according to battery pack working requirements of new energy automotive, for meeting the battery pack processing of new energy automotive in theory , single-sided duplex parallel resistance mass spot welding process is proposed.

Abstract: The present work is concerned with the rolling motion of the battery pack when EV travelling on the road. First McPherson suspension system was regarded as the research object with detailed analysis of its structural features and motion characteristics. Establish the mathematical model which could apply to calculating the rolling motion of the vehicle body. Through MATLAB/Simulink simulation software, we could calculate the rolling angle on passive suspension. On this basis, assume that the battery pack mounted on the vehicle body and make it passive connection and PID connection. When the body rolls, the battery pack will produce a certain angle then. Next establish the mathematical model to summarize the relationship between the two variables. Then we set the parameters and calculate the roll angle of battery pack in both cases for comparison. Simulation results show that road irregularities will make battery rotate an angle and PID controller can effectively reduce the angle, especially angular acceleration. This paper put forward a new idea that battery is connected with body by active control on EV, and proves the superiority in reducing the rolling angle.

Abstract: Effective thermal management of battery pack is essential for electric vehicle to adapt to different kinds of external environment, achieve desired working efficiency and life cycle of the power batteries. In this paper, a novel thermal management system is designed for battery pack in electric vehicle. Visualized simulation analysis of the thermal management system is carried on under different working conditions by CFD, then the structure parameters will be optimized. According to the conclusion, the thermal management system has been indicated to be effective to ensure an appropriate temperature range and the normal work of the power batteries in electric vehicle.

Abstract: The circuit structure and the sampling principle of single battery voltage detecting circuit were introduced. Switching network timing of single voltage sampling was described, and voltage conditioning circuit parameters were calculated. There were some errors in the measurement results. Through the analysis of the main sources of the errors, corresponding correction strategy was given. The test results showed that experimental results after correction were more accurate and stable.

Abstract: Reconditioning is designed to recover the battery on-orbit performance by the most geosynchronous satellites. This paper is to look at post-flight processing of the batteries in spacecraft home and abroad, make comparison and analysis.

Abstract: The development situation of power batteries is described in this paper. After a detailed comparison between lead-acid battery, Ni-MH battery and Li-ion battery, it is concluded that polymer Li-ion battery is the most promising power source for battery electric vehicle (BEV). Although great achievement has been obtained in Li-ion battery development, restrictions still remain on the industrialization of battery electric vehicles. Poor battery packs, patent disputes and the establishment of charging facilities are three key problems in the process of industrializing BEVs. Finally, the generalization of BEVs relies on not only marketing efforts by automotive manufacturers, but also policy support by the government.

Abstract: To solve the problems of online monitoring system for high-voltage battery pack in series, this paper states the design of a practical interface circuit. The circuit consists of PhotoMOS, MCU and electrical switch. The PhotoMOS controlled by MCU could connect the measuring battery to measuring circuit, meanwhile the other batteries are physically isolated from the measuring circuit, and has no influence to the measuring circuit. This method effectively lowers the complexity of circuit, and improves measurement precision.

Abstract: Keeping appropriate temperature of battery pack is crucial for EV/HEV’s safe operation and optimal performance. Existing literatures mainly concerned theoretical analysis on comparison of different cooling/heating methods and distribution of temperature field in a battery pack. This paper reviewes recent research about design, test and optimization of thermal management system, and presents a prediction of development. Further research should focus on coefficient-of-performance (COP) analysis, closed-cycle control of heating/cooling power, optimizing the theoretical designs and testing more battery packs.