Electromagnetic Interference Simulation and Test of Power Battery System Based on Impedance Characteristics

doi:10.11908/j.issn.0253-374x.20184

Home > Archive>Volume 48, Issue 12, 2020 >1797-1809. DOI:10.11908/j.issn.0253-374x.20184

Electromagnetic Interference Simulation and Test of Power Battery System Based on Impedance Characteristics
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                        10.11908/j.issn.0253-374x.20184
                    
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Author:
                        ZHANG JiZHANG Ji
College of Automotive Studies，Tongji University，Shanghai 201804，China
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LÜ XiangjieLÜ Xiangjie
College of Automotive Studies，Tongji University，Shanghai 201804，China
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LÜ YuLÜ Yu
College of Automotive Studies，Tongji University，Shanghai 201804，China
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Affiliation:College of Automotive Studies，Tongji University，Shanghai 201804，China
Clc Number:U270. 11
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Abstract:

By taking the lithium-ion power battery cell as the research object， the impedance characteristics of the battery cell in different frequency bands are measured to characterize the battery characteristics， and the electrical model is used to fit the impedance characteristics of the entire frequency band， and the impedance characteristics of the battery cell and BUSBAR are combined to establish the entire power. The electrical characteristics model of the battery pack. The electric drive system is the main source of electromagnetic interference in automobiles. On the basis of research and analysis of motor characteristics and control strategies， the electromagnetic interference model of the power battery system including the electric drive system is established. The total current change on the DC bus of the power battery system is obtained through simulation and compared with the actual vehicle test results. This paper is of great significance to study the electromagnetic interference and its influence mechanism of the power battery system itself， to find and solve potential electromagnetic interference problems in a timely and correct manner， and to improve the performance of the battery pack system， the vehicle and the reliability of the system.

Key words:cell equivalent circuit model;power battery system;full-band impedance characteristics;torque current ratio control

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Table 1

Fig.1 Electrochemical impedance spectrum measuring equipment

Fig.2 Measurement results of electrochemical impedance spectrum of lithium ion battery

Fig.3 Equivalent circuit model of low frequency for lithium ion battery

Fig.4 Measurement and fitting results of electrochemical impedance spectrum of lithium ion battery

Fig.5 Measurement results of the intermediate frequency impedance characteristics of lithium ion batteries

Fig.6 Fitting results of the mathematical model of the lithium-ion battery’s intermediate frequency impedance characteristics

Fig.7 Equivalent circuit fitting results of lithium-ion battery intermediate frequency impedance characteristics

Fig.8 Measurement results of high-frequency impedance characteristics of lithium-ion batteries

Fig.9 Spectral curves of the parasitic inductance and parasitic capacitance of a lithium battery cell

Fig.10 High-frequency impedance equivalent circuit of lithium-ion battery

Fig.11 Equivalent circuit fitting results of high-frequency impedance characteristics of lithium-ion batteries

Fig.12 Fitting result of equivalent circuit of full-frequency impedance characteristic of lithium ion battery

Fig.13 BUSBAR high frequency impedance characteristic test chart

Fig.14 BUSBAR high-frequency impedance equivalent circuit

Fig.15 BUSBAR high-frequency impedance characteristic equivalent circuit fitting results

Fig.16 Voltage space vector

Fig.18 Generate PWM wave

Fig.19 SVPWM waveform generation module

Fig.20 PMSM maximum torque current ratio control principle

Fig.21 Change of vehicle speed with time under acceleration and deceleration conditions

Fig.22 External characteristic curve of the motor

Fig.23 Motor input torque curve

Fig.24 Motor input speed curve

Fig.25 PMSM maximum torque current ratio control model

Fig.26 Electromagnetic simulation model of power battery system

Fig.27 The output torque and speed of the simulated motor of the electric drive system

Fig.28 General layout of data collection for electric vehicle actual vehicle operating conditions

Fig.29 Comparison of current simulation and test on both sides of the battery pack

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ZHANG Ji, Lü Xiangjie, Lü Yu. Electromagnetic Interference Simulation and Test of Power Battery System Based on Impedance Characteristics[J].同济大学学报(自然科学版),2020,48(12):1797~1809

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Received:August 28,2020
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Online: December 31,2020
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