發(fā)布時間：2018-05-20 16:54

  本文選題：電動汽車 + 動力電池��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：近幾十年來國內(nèi)汽車產(chǎn)業(yè)有了很大的發(fā)展，，但是汽車電磁兼容性的研究依然滯后。尤其是近些年來國內(nèi)環(huán)境污染問題突出，電動汽車作為緩解環(huán)境問題的有效途徑亟需在技術(shù)上有更大突破。針對目前國內(nèi)汽車電磁兼容的研究現(xiàn)狀，本文對電動汽車主要電磁干擾耦合節(jié)點—動力電池的電磁兼容性進行研究。本文從電動汽車高壓動力電池的電磁兼容特性出發(fā)，重點對動力電池的全頻交流阻抗特性進行建模仿真研究，并實現(xiàn)了其在整車電磁兼容模型中的應(yīng)用。本文的主要研究工作包括以下幾個方面： 1)分析了電動汽車以DC/DC、DC/AC和驅(qū)動電機為干擾源，高壓動力電池為干擾耦合路徑對其它系統(tǒng)的干擾影響。主要分析了DC/DC變換器和DC/AC逆變器中高壓開關(guān)型器件高速通斷過程中產(chǎn)生脈沖電流，該電流通過動力電池以及電纜線傳導(dǎo)進入各個控制器以及其它低壓系統(tǒng)，從而產(chǎn)生電磁干擾。分析了動力電池作為干擾傳播路徑對整車電磁兼容性的影響。 2)分析了傳導(dǎo)EMI影響下的電池阻抗特性。分頻段分析了傳導(dǎo)電磁干擾對電池阻抗的影響。通過分析發(fā)現(xiàn)頻率很低時主要是電池內(nèi)部電解液中離子的擴散效應(yīng)影響電池阻抗，隨著頻率的升高擴散效應(yīng)的影響逐漸減弱而電極極化效應(yīng)對電池阻抗特性的影響逐漸增強，當(dāng)EMI的頻率達到千赫茲級以上時則主要通過集膚效應(yīng)影響電池阻抗。 3)研究了電動汽車工作環(huán)境對動力電池特性的影響。主要分析了電動汽車在正常工況下運行時溫度對電池阻抗特性的影響，電池荷電狀態(tài)對電池阻抗特性的影響以及電池老化對電池阻抗特性的影響。 4)針對傳導(dǎo)干擾，研究了動力電池的高頻模型�；陬l域分析法建立了動力電池單體及串并聯(lián)電池組的高頻數(shù)學(xué)模型；基于時域分析法建立了單體及電池組的高頻電路模型；以及基于矢量匹配法建立了電池高頻電路模型。最后對不同模型進行了對比分析。 5)討論了動力電池阻抗模型在整車電磁兼容仿真中的應(yīng)用。介紹了高壓系統(tǒng)干擾源的提取方法，建立了動力電池耦合干擾的等效模型并將提取的干擾源應(yīng)用于耦合干擾模型，在Saber仿真軟件中進行了仿真。并分別對仿真波形在時域和頻域進行了分析。
[Abstract]:In recent decades, there has been great development in domestic automobile industry, but the research of electromagnetic compatibility of automobile is still lagging behind. Especially in recent years, the problem of domestic environmental pollution is prominent, electric vehicles as an effective way to alleviate environmental problems need to have a greater technical breakthrough. In view of the current research status of EMC in domestic vehicles, this paper studies the EMC of the main EMI coupling node-power battery. Based on the EMC characteristics of high voltage power battery of electric vehicle, this paper focuses on the modeling and simulation of the full frequency AC impedance characteristics of the power battery, and realizes its application in the electromagnetic compatibility model of the whole vehicle. The main research work of this paper includes the following aspects: 1) the interference effects of DC / DC / DC / AC and drive motor as interference source and high voltage power battery as interference coupling path on other systems are analyzed. The pulse current generated by high voltage switching devices in DC/DC converters and DC/AC inverters is analyzed in this paper. The current is transmitted to various controllers and other low voltage systems through power batteries and cable lines, which results in electromagnetic interference (EMI). The influence of power battery as the path of interference propagation on the electromagnetic compatibility of the whole vehicle is analyzed. 2) the impedance characteristics of the battery under the influence of conducting EMI are analyzed. The influence of conductive electromagnetic interference (EMI) on the impedance of the battery is analyzed in different frequency bands. It is found that the diffusion effect of ions in the electrolyte affects the impedance of the battery when the frequency is very low, and the effect of the diffusion effect weakens gradually with the increase of the frequency, and the effect of the polarization effect on the impedance characteristic of the battery increases gradually. When the frequency of EMI reaches KHz level, the cell impedance is mainly affected by skin effect. 3) the influence of the working environment of electric vehicle on the characteristics of power battery is studied. The influence of temperature on the impedance characteristics of the battery under normal operating conditions, the effect of the charging state of the battery on the impedance characteristics of the battery and the influence of the aging of the battery on the impedance characteristics of the battery are mainly analyzed. 4) the high frequency model of power battery is studied for conducting interference. Based on frequency domain analysis, the high frequency mathematical model of power cell and series and parallel battery pack is established; the high frequency circuit model of single cell and battery pack is established based on time domain analysis method; and the high frequency circuit model of power cell is established based on vector matching method. Finally, the different models are compared and analyzed. 5) the application of power battery impedance model in EMC simulation of whole vehicle is discussed. This paper introduces the extraction method of interference source in high voltage system, establishes the equivalent model of the coupling interference of power battery, applies the extracted interference source to the coupled interference model, and simulates it in Saber simulation software. The simulation waveforms are analyzed in time domain and frequency domain respectively.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U469.72;TM912

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