本文選題：鋰離子電池　切入點(diǎn)：熱特性　出處：《吉林大學(xué)》2014年碩士論文

【摘要】：隨著資源短缺和環(huán)境污染的日益嚴(yán)重，汽車保有量的不斷提高，新能源汽車的研發(fā)與推廣已經(jīng)成為國(guó)家制定城市發(fā)展戰(zhàn)略的重要手段。由于城市用車具有日行駛里程相對(duì)固定，停車位置比較集中的特點(diǎn)，因此更加有利于純電動(dòng)汽車的推廣。為了滿足純電動(dòng)汽車?yán)m(xù)駛里程，或者為了達(dá)到足夠的驅(qū)動(dòng)要求及制動(dòng)能量回收效能，需要車載電池能夠保證更多的能量供給，也帶來(lái)了電池包熱管理的難題。由于電池包溫度與電池的使用性能與使用壽命息息相關(guān)，同時(shí)也影響著電池組的可靠性與安全性，研究電池包生熱、傳熱、散熱的有關(guān)規(guī)律，設(shè)計(jì)合理的電池包結(jié)構(gòu)，研發(fā)有效的電池?zé)峁芾硐到y(tǒng)變得十分重要。 本文分析和總結(jié)了國(guó)內(nèi)外電池?zé)峁芾淼难芯楷F(xiàn)狀，采用計(jì)算流體力學(xué)的分析方法進(jìn)行了電池選型與結(jié)構(gòu)優(yōu)化，下面介紹論文研究?jī)?nèi)容。 首先對(duì)國(guó)內(nèi)外的研究現(xiàn)狀進(jìn)行分析，從鋰離子電池反應(yīng)及生熱原理入手，，著重研究了電池組一致性對(duì)電池使用性能的影響。通過(guò)分析電池容量、內(nèi)阻與溫度之間的關(guān)系，得到在保證電池一致性前提下所需要進(jìn)行溫度及溫差控制的目標(biāo)范圍。 其次研究了鋰離子電池生熱、傳熱及散熱的基本原理，通過(guò)合理簡(jiǎn)化，利用計(jì)算流體力學(xué)仿真軟件FLUENT得到鋰離子電池的熱模型，通過(guò)Matlab及Advisor以擬合曲線與數(shù)組存儲(chǔ)的方式獲取了恒流充電與循環(huán)工況下的生熱速率，并通過(guò)FLUENT實(shí)時(shí)調(diào)用的方式仿真對(duì)比了兩種鋰離子電池的溫度場(chǎng)分布，最終確定選擇小容量的鋰離子電池并聯(lián)以獲得較低的溫升及較小的溫差 最后對(duì)某電池包進(jìn)行建模，改變其結(jié)構(gòu)參數(shù)進(jìn)行一系列仿真，通過(guò)分析不同結(jié)構(gòu)參數(shù)下電池包的溫度場(chǎng)、壓力場(chǎng)及流線分布，總結(jié)強(qiáng)制風(fēng)冷的冷卻規(guī)律，最終確定楔形通風(fēng)結(jié)構(gòu)各項(xiàng)結(jié)構(gòu)參數(shù)，使其在循環(huán)工況條件下一致性保持在98%以上，在快速充電和恒流充電條件下，一致性保持在95%左右。
[Abstract]:With the increasing shortage of resources and environmental pollution and the continuous improvement of vehicle ownership, the research and development and promotion of new energy vehicles have become an important means for the country to formulate urban development strategy, because urban vehicles have relatively fixed daily mileage. In order to meet the continuous driving mileage of pure electric vehicles, or to achieve sufficient driving requirements and braking energy recovery efficiency, The need for on-board batteries can ensure more energy supply, which also brings the problem of heat management in battery pack. Because the temperature of battery pack is closely related to the performance and service life of battery, it also affects the reliability and safety of battery pack. It is very important to study the rules of heat generation, heat transfer and heat dissipation, to design a reasonable battery package structure and to develop an effective battery heat management system. This paper analyzes and summarizes the current research situation of battery thermal management at home and abroad, adopts the analytical method of computational fluid dynamics to select the battery type and optimize the structure, and introduces the research content of this paper. Firstly, the current research situation at home and abroad is analyzed, and the effect of battery consistency on the battery performance is studied based on the principle of lithium-ion battery reaction and heat generation. The relationship among battery capacity, internal resistance and temperature is analyzed. The target range of temperature and temperature difference control is obtained under the premise of cell consistency. Secondly, the basic principles of heat generation, heat transfer and heat dissipation of lithium ion battery are studied. Through reasonable simplification, the thermal model of lithium ion battery is obtained by using computational fluid dynamics simulation software FLUENT. The heat generation rate under constant current charging and cycle condition was obtained by fitting curve and array storage by Matlab and Advisor. The temperature field distribution of two kinds of lithium ion batteries was simulated and compared by FLUENT real-time call. It was determined that the lithium ion battery with small capacity should be connected in parallel to obtain lower temperature rise and smaller temperature difference. Finally, a battery package is modeled, and its structural parameters are changed to carry out a series of simulations. By analyzing the temperature field, pressure field and streamline distribution of the battery bag under different structural parameters, the cooling law of forced air cooling is summarized. Finally, the structural parameters of the wedge ventilation structure are determined to keep the consistency above 98% under the cyclic condition, and about 95% under the condition of fast charging and constant current charging.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM912;U469.72

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本文編號(hào)：1683860