本文選題：混合動力公交客車 + 磷酸鐵鋰電池��； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：由于具有良好的充放電性能和安全性能，鋰離子動力電池已在混合動力電動公交客車（Hybrid Electric Bus，HEB）上得到了廣泛地應(yīng)用。針對在廣州市公交行駛工況條件下，HEB鋰離子動力電池出現(xiàn)的工作溫度差異大、電池艙產(chǎn)熱量大和散熱差的難題，以廣州某款HEB的磷酸鐵鋰（LiFePO4/C）動力電池艙為研究對象，以提高電池艙中LiFePO4/C動力電池組的散熱性能為目的，采用實驗和計算流體動力學(xué)（ComputationalFluid Dynamics，CFD）的方法，研究LiFePO4/C動力電池，電池箱及其電池艙的產(chǎn)熱及傳熱特性，提出基于散熱性能的電池箱散熱結(jié)構(gòu)設(shè)計方法。 首先，以LiFePO4/C電池單體為對象，通過電池充放電實驗和電池?zé)嵝?yīng)的理論分析和計算，研究溫度與電池容量，內(nèi)阻，開路電壓與荷電狀態(tài)的關(guān)系，探討LiFePO4/C動力電池充放電時的產(chǎn)熱和傳熱機理，以及對流換熱系數(shù)和空氣來流溫度對電池散熱性能的影響。然后，以HEB的LiFePO4/C電池艙為對象，根據(jù)流體動力學(xué)及傳熱學(xué)理論，研究電池艙內(nèi)空氣的流動與傳熱原理，建立電池艙及其內(nèi)部的LiFePO4/C電池箱和電池組的幾何模型，，網(wǎng)格模型，以及空氣流動與傳熱數(shù)學(xué)模型，結(jié)合電池艙實車測試實驗和電池?zé)崽匦苑治鰜慝@取CFD仿真的邊界條件。在此基礎(chǔ)上，對電池艙內(nèi)空氣流場和LiFePO4/C電池組的溫度場進行CFD仿真計算，并分析冷卻空氣流動和溫度分布與電池組散熱的關(guān)系；以此為向?qū)�，提出風(fēng)道熱阻模型，并以此來探討電池箱內(nèi)電池散熱風(fēng)道的傳熱機理。 其次，進行了HEB實車測試實驗，分析了HEB在實際公交客車行駛工況下，電池組的散熱性能；并通過對HEB電池箱的充放電試驗，驗證了CFD仿真計算的結(jié)果。 最后，在熱特性分析的基礎(chǔ)上，提出了在電池箱中增設(shè)泄風(fēng)口和可交替改變冷卻空氣流動方向的散熱方法，并通過CFD仿真實驗對其散熱效果進行驗證。
[Abstract]:Because of its good charge-discharge performance and safety performance, lithium-ion power battery has been widely used in Hybrid Electric bus HEB. In order to solve the problems of large difference of working temperature, large heat production and heat dissipation of LiFePO _ 4 / C _ (C) battery in Guangzhou, a LiFePO _ 4 / C _ 3 battery tank of HEB was used as the research object, in order to solve the problem of the difference in operating temperature, heat production and heat dissipation of the LiFePO _ 4 / C _ (C) battery in Guangzhou. In order to improve the heat dissipation performance of the LiFePO4/C power battery pack in the battery tank, the heat production and heat transfer characteristics of the LiFePO4/C power cell, the battery box and the battery tank are studied by using the method of experimental and computational fluid dynamics (CFD). The design method of heat dissipation structure of battery box based on heat dissipation performance is proposed. First of all, the relationship between temperature and battery capacity, internal resistance, open circuit voltage and charged state is studied through battery charge and discharge experiments and theoretical analysis and calculation of the thermal effect of LiFePO4/C cells. The mechanism of heat production and heat transfer during charge and discharge of LiFePO4/C power cell and the effects of convection heat transfer coefficient and air temperature on the heat dissipation performance of the cell are discussed. Then, based on the theory of fluid dynamics and heat transfer, the flow and heat transfer principle of air in HEB's LiFePO4/C battery tank is studied, and the geometry model and grid model of LiFePO4/C battery tank and battery pack are established. The mathematical model of air flow and heat transfer and the boundary conditions of CFD simulation are obtained by combining the test experiment of the battery cabin and the analysis of the thermal characteristics of the battery. On this basis, the air flow field and the temperature field of the LiFePO4/C battery pack are simulated by CFD, and the relationship between the cooling air flow and temperature distribution and the heat dissipation of the battery pack is analyzed. The heat transfer mechanism of the air channel in the battery box is discussed. Secondly, the HEB real vehicle test experiment is carried out, and the heat dissipation performance of HEB battery pack under the actual bus driving condition is analyzed, and the results of CFD simulation calculation are verified by charging and discharging test of HEB battery box. Finally, based on the analysis of thermal characteristics, a new method of heat dissipation is proposed, which can alternately change the flow direction of cooling air by adding a vent to the battery box, and the heat dissipation effect is verified by CFD simulation experiment.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U469.7;TM912

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