Battery pack electromagnetic interference modeling simulation and test method

Abstract

The invention discloses a battery pack electromagnetic interference modeling simulation and a test method. The method comprises the following steps of firstly determining electromagnetic interferenceelements; then carrying out a battery pack impedance characteristic test, and establishing a high-frequency impedance model of the battery pack; building an equivalent circuit model of the motor driving system based on the high-frequency impedance model of the battery pack; performing joint simulation on the control motor and control system model and the IGBT equivalent circuit model to obtain a simulation result of the common-mode current at the output side of the inverter and the direct-current bus end; carrying out the conduction interference test on the motor driving system, obtaining an experiment result of common-mode current of the output side and the direct-current bus end of the inverter; finally, comparing a simulation result with the experiment result to verify the accuracy of the simulation result. An electromagnetic field in the battery system is simulated through simulation software. The electromagnetic field distribution in the battery system and possible interference conditions during vehicle driving are analyzed. The theoretical support and academic basis are provided for electromagnetic simulation of the battery system and the whole vehicle.

Description

technical field [0001] The present invention relates to the field of battery pack systems, in particular to a battery pack electromagnetic interference modeling simulation and testing method. Background technique [0002] The battery pack is an important high-voltage component of an electric vehicle. Under high frequency conditions, the transient voltage and current generated under complex working conditions will affect the migration of ions in the battery electrolyte, thereby affecting the diffusion effect and polarization effect, resulting in battery impedance and changes in parasitic parameters. At high frequencies, the battery is no longer an ideal equivalent model, and the parasitic parameters of the lithium battery cannot be ignored at this time, which may cause unpredictable electromagnetic interference (EMI) problems. But so far, the battery pack has been regarded as the disturbed object or the propagation path of electromagnetic interference, and has not been studi...

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Problems solved by technology

[0005] The current conduction and radiation tests of components are mainly aimed at vehicle components with power supply voltages of 12V and 24V, while the high-voltage battery packs of electric vehicles are usually above 300V. At present, there are no electromagnetic test standards for high-voltage systems at home and abroad, which makes batteries The electromagnetic characteristics of the package are difficult to prove, so it is necessary to formulate electromagnetic testing standards suitable for high-voltage systems

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