本文選題：鋰電池化成　切入點：溫度場　出處：《東華大學》2014年碩士論文　論文類型：學位論文

【摘要】：鋰離子電池因其比能量高、循環(huán)壽命長、環(huán)境污染小等優(yōu)點正成為新能源汽車的主流動力源。鋰離子動力電池作為汽車的關鍵部件,其充放電性能及可靠性將直接影響整車的成本和性能,而鋰電池化成工藝過程的多次充放電的電化學反應使其產(chǎn)生大量的熱量,為此充放電過程中對電池以及電池周邊工況的散熱好壞成為影響鋰電池化成效果的關鍵因素。本課題以實際鋰電池化成單元為研究對象,從理論和試驗仿真兩個方面對鋰電池的生熱機理、散熱方法進行研究,并由此探索散熱結(jié)構(gòu)的設計方法,對鋰離子電池生產(chǎn)具有重要的實際意義和應用價值。本文的研究內(nèi)容主要如下： (一)充分調(diào)研鋰電池的結(jié)構(gòu)組成,電化學原理,化成工藝,以及鋰電池充放電過程中的生熱機理,為后續(xù)開展理論分析和計算仿真提供了理論基礎； (二)根據(jù)鋰離子電池的傳熱及散熱特性,建立了鋰電池的熱效應模型,計算了鋰電池的熱物性參數(shù)；根據(jù)Bernadi D提出的電池生熱理論建立了鋰電池的生熱速率模型,并計算電池在化成過程中的內(nèi)部生熱量； (三)應用Fluent軟件對電池生熱模型進行流體動力學仿真分析,完成了鋰電池溫度模型的建模、邊界條件設置,計算得到在自然狀態(tài)下鋰電池單體和鋰電池組的生熱溫度場。進一步分析了鋰電池化成充放電單元的溫度場分布情況,探討充放電單元空間設計對鋰電池組溫度場的影響。這些為后續(xù)開展散熱結(jié)構(gòu)設計提供了分析依據(jù)； (四)結(jié)合流體力學的基本理論,開展散熱結(jié)構(gòu)的設計。提出了上吹風、下抽風、近封閉式通風箱以及變截面通風箱等四種散熱設計,并應用Fluent對該四種設計的散熱溫度場進行數(shù)值模擬,完成了對散熱結(jié)構(gòu)中影響散熱效果的因素的定量分析,從而確定合適的結(jié)構(gòu)參數(shù)。 論文提出了鋰電池化成過程的熱場模擬仿真和分析方法,建立了有效的數(shù)學模型,并開展了多種散熱結(jié)構(gòu)的設計和分析,這些將為鋰離子電池化成過程的散熱設計提供有效的設計方法和設計依據(jù),也將為鋰電池化成自動化生產(chǎn)線的關鍵部件的設計提供參考借鑒。
[Abstract]:Lithium ion battery is becoming the mainstream power source of new energy vehicle because of its high specific energy, long cycle life and low environmental pollution. The charge / discharge performance and reliability will directly affect the cost and performance of the whole vehicle, while the electrochemical reaction of multiple charges and discharges in the forming process of lithium battery will produce a lot of heat. Therefore, the heat dissipation of the battery and its peripheral conditions in the process of charging and discharging has become the key factor affecting the formation effect of the lithium battery. In this paper, the actual lithium battery formation unit is taken as the research object. The heat generation mechanism and heat dissipation method of lithium battery are studied from two aspects of theory and experiment simulation, and the design method of heat dissipation structure is explored. It has important practical significance and application value for the production of lithium ion battery. The main contents of this paper are as follows:. (1) the structure, electrochemical principle, forming process and heat generation mechanism of lithium battery during charge and discharge are investigated, which provides a theoretical basis for the subsequent theoretical analysis and simulation; (2) according to the heat transfer and heat dissipation characteristics of the lithium ion battery, the thermal effect model of the lithium battery is established, and the thermal physical parameters of the lithium battery are calculated, and the heat generation rate model of the lithium battery is established according to the theory of heat generation proposed by Bernadi D. The internal heat generation of the battery in the process of formation is calculated. (3) using Fluent software to simulate and analyze the heat generation model of the battery, the modeling of the temperature model of the lithium battery and the setting of the boundary conditions are completed. The heat generation temperature field of lithium cell monomer and battery pack is calculated in natural state. The temperature field distribution of the charge / discharge unit of lithium battery is further analyzed. The effect of charging and discharging unit space design on the temperature field of lithium battery pack is discussed. (4) combined with the basic theory of fluid mechanics, the design of heat dissipation structure is carried out. Four kinds of heat dissipation designs, such as upper blow, lower air, near closed ventilation box and variable section ventilation box, are put forward. The numerical simulation of the four designed heat dissipation temperature fields is carried out by using Fluent, and the quantitative analysis of the factors affecting the heat dissipation effect in the heat dissipation structure is completed, and the appropriate structural parameters are determined. In this paper, the thermal field simulation and analysis method of the formation process of lithium battery is put forward, the effective mathematical model is established, and the design and analysis of various heat dissipation structures are carried out. These will provide an effective design method and design basis for the heat dissipation design of Li-ion battery formation process, and will also provide reference for the design of key components of the Li-ion battery formation automation production line.
【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM912

【參考文獻】

相關期刊論文 前10條

1 龐靜,盧世剛;鋰離子電池高溫反應及其影響因素[J];電池工業(yè);2004年03期

2 齊曉霞,王文,邵力清;混合動力電動車用電源熱管理的技術(shù)現(xiàn)狀[J];電源技術(shù);2005年03期

3 張賓;林成濤;陳全世;;電動汽車用LiFePO_4/C鋰離子蓄電池性能[J];電源技術(shù);2008年02期

4 張遙;白楊;劉興江;;動力用鋰離子電池熱仿真分析[J];電源技術(shù);2008年07期

5 王峰;李茂德;;電池熱效應分析[J];電源技術(shù);2010年03期

6 王松蕊;盧立麗;劉興江;;鋰離子電池放電過程的模擬研究[J];電源技術(shù);2011年06期

7 林成濤,陳全世;燃料電池客車動力系統(tǒng)結(jié)構(gòu)分析[J];公路交通科技;2003年05期

8 姚征,陳康民;CFD通用軟件綜述[J];上海理工大學學報;2002年02期

9 李哲;韓雪冰;盧蘭光;歐陽明高;;動力型磷酸鐵鋰電池的溫度特性[J];機械工程學報;2011年18期

10 陳全世,齊占寧;燃料電池電動汽車的技術(shù)難關和發(fā)展前景[J];汽車工程;2001年06期

，

本文編號：1631152