動力鋰離子電池?zé)岱治鲅芯?/H1>
發(fā)布時間：2018-04-10 07:37
本文選題：鋰離子電池 切入點：熱安全 出處：《重慶交通大學(xué)》2015年碩士論文
【摘要】：鋰離子電池由于具有高電壓、高放電電流、高能量密度和綠色環(huán)保等優(yōu)勢,被廣泛地應(yīng)用于電動汽車等動力設(shè)備。鋰離子電池在充放電過程中會產(chǎn)生大量的熱,熱量的集聚導(dǎo)致電池溫度急驟升高,如果不能及時的將熱量散開,會導(dǎo)致電池的充放電性能、壽命和安全性能降低。安全性一直是消費者最為關(guān)心的,該性能的好壞與消費者的財產(chǎn)生命安全息息相關(guān)。由此可見在鋰離子電池設(shè)計生產(chǎn)使用過程中,電池組的散熱非常重要。研究單體電池和電池組溫度場分布情況,進一步找出其影響因素,從而提高動力鋰離子電池?zé)岚踩阅?對提高電動汽車等動力設(shè)備的主動安全性具有非常重要的工程價值。本文在廣東省引進創(chuàng)新科研團隊專項資金(2011N071)—先進儲能設(shè)備的開發(fā)項目的支持下,采用實驗和計算流體動力學(xué)技術(shù)(CFD)相結(jié)合,展開對單體軟包電池、動力電池組模塊的產(chǎn)熱與散熱分析,在此基礎(chǔ)上,對某空調(diào)電池箱散熱方案的設(shè)計與優(yōu)化進行深入研究。首先,建立鋰離子單層電極單元的二維模型,計算電池在工作過程中電極上電場分布規(guī)律。計算結(jié)果表明,電流主要集中分布在極耳引出端附近。其次,利用實驗方法,測量軟包電池的部分物性參數(shù),建立軟包電池的產(chǎn)熱模型。進一步采用CFD技術(shù)對單體軟包電池進行數(shù)值模擬,并利用實驗采集軟包電池表面溫度,驗證模型的可靠性。分別以電流為10A和60A對軟包電池進行放電模擬,當電池荷電狀態(tài)(SOC)從1至0的整個放電過程中,10A放電電池表面5個可靠監(jiān)控點表明模型最大誤差不超過0.5℃,60A放電電池表面4個可靠監(jiān)控點表明模型最大誤差不超過2℃。再次,借助于軟包電池的產(chǎn)熱模型,研究電池單體模塊外殼材料、厚度及散熱面等對電池模塊散熱性能的影響。研究表明,材料為鋼厚度在2mm左右的電池外殼散熱性能較好。此外,針對電池模塊后蓋對電池組通風(fēng)散熱性能的影響進行研究,結(jié)果表明,在電池后蓋的設(shè)計過程中,將其與電池底部接觸面去掉有利于提高電池組的散熱性能。最后,以某空調(diào)電池箱通風(fēng)散熱開發(fā)為例,考慮電池箱內(nèi)電池組與空氣流場的耦合模型,初步提出三種電池箱通風(fēng)散熱方案,對電池箱內(nèi)電池組進行放電數(shù)值模擬。對比分析三個方案電池組溫度場,發(fā)現(xiàn)方案三的綜合散熱性能較好。因此,選取方案三進行改進,從而達到控制箱內(nèi)電池組最高溫度和溫度分布均勻性的目的。對改進后的電池箱以200A進行放電,在整個放電過程中,電池組最高溫度為47.38℃,電池間最大溫差略低于5℃。研究結(jié)果表明,優(yōu)化后的方案三在通風(fēng)散熱和電池組溫度均勻性方面均達到要求。
[Abstract]:Li-ion batteries are widely used in electric vehicles and other power equipment due to their advantages of high voltage, high discharge current, high energy density and green environment.A large amount of heat will be produced in the process of charging and discharging of lithium-ion batteries, and the accumulation of heat will lead to a sharp rise in the battery temperature. If the heat is not dispersed in time, the charge-discharge performance, lifetime and safety performance of the battery will be reduced.Safety has always been the most concerned by consumers, and the quality of the performance is closely related to the safety of consumer property.It can be seen that the heat dissipation of the battery pack is very important in the design and production of lithium ion battery.In order to improve the thermal safety performance of Li-ion battery, it is of great engineering value to study the temperature field distribution of single cell and battery pack, and to find out the influencing factors, and to improve the active safety of power equipment such as electric vehicle.In this paper, supported by the development project of advanced energy storage equipment with the special fund of innovative scientific research team introduced by Guangdong Province, this paper combines the experimental and computational fluid dynamics technology (CFDs) to develop the single-cell soft-package battery.On the basis of analysis of heat production and heat dissipation of power battery pack module, the design and optimization of heat dissipation scheme for a certain air conditioning battery box are studied in depth.Firstly, a two-dimensional model of lithium ion monolayer electrode unit is established to calculate the distribution of electric field on the electrode during the operation of the battery.The calculation results show that the current mainly distributes near the polar ear elicitation.Secondly, some physical parameters are measured by the experimental method, and the heat production model of the soft-clad battery is established.Furthermore, the numerical simulation of the single cell was carried out by using CFD technology, and the surface temperature of the cell was collected by experiments to verify the reliability of the model.The current of 10A and 60A was used to simulate the discharge of the soft-clad battery.During the whole discharge process from 1 to 0, the maximum error of the model is less than 0.5 鈩，
本文編號：1730284
本文鏈接：http://sikaile.net/kejilunwen/dianlilw/1730284.html
本文選題：鋰離子電池 切入點：熱安全 出處：《重慶交通大學(xué)》2015年碩士論文
【摘要】：鋰離子電池由于具有高電壓、高放電電流、高能量密度和綠色環(huán)保等優(yōu)勢,被廣泛地應(yīng)用于電動汽車等動力設(shè)備。鋰離子電池在充放電過程中會產(chǎn)生大量的熱,熱量的集聚導(dǎo)致電池溫度急驟升高,如果不能及時的將熱量散開,會導(dǎo)致電池的充放電性能、壽命和安全性能降低。安全性一直是消費者最為關(guān)心的,該性能的好壞與消費者的財產(chǎn)生命安全息息相關(guān)。由此可見在鋰離子電池設(shè)計生產(chǎn)使用過程中,電池組的散熱非常重要。研究單體電池和電池組溫度場分布情況,進一步找出其影響因素,從而提高動力鋰離子電池?zé)岚踩阅?對提高電動汽車等動力設(shè)備的主動安全性具有非常重要的工程價值。本文在廣東省引進創(chuàng)新科研團隊專項資金(2011N071)—先進儲能設(shè)備的開發(fā)項目的支持下,采用實驗和計算流體動力學(xué)技術(shù)(CFD)相結(jié)合,展開對單體軟包電池、動力電池組模塊的產(chǎn)熱與散熱分析,在此基礎(chǔ)上,對某空調(diào)電池箱散熱方案的設(shè)計與優(yōu)化進行深入研究。首先,建立鋰離子單層電極單元的二維模型,計算電池在工作過程中電極上電場分布規(guī)律。計算結(jié)果表明,電流主要集中分布在極耳引出端附近。其次,利用實驗方法,測量軟包電池的部分物性參數(shù),建立軟包電池的產(chǎn)熱模型。進一步采用CFD技術(shù)對單體軟包電池進行數(shù)值模擬,并利用實驗采集軟包電池表面溫度,驗證模型的可靠性。分別以電流為10A和60A對軟包電池進行放電模擬,當電池荷電狀態(tài)(SOC)從1至0的整個放電過程中,10A放電電池表面5個可靠監(jiān)控點表明模型最大誤差不超過0.5℃,60A放電電池表面4個可靠監(jiān)控點表明模型最大誤差不超過2℃。再次,借助于軟包電池的產(chǎn)熱模型,研究電池單體模塊外殼材料、厚度及散熱面等對電池模塊散熱性能的影響。研究表明,材料為鋼厚度在2mm左右的電池外殼散熱性能較好。此外,針對電池模塊后蓋對電池組通風(fēng)散熱性能的影響進行研究,結(jié)果表明,在電池后蓋的設(shè)計過程中,將其與電池底部接觸面去掉有利于提高電池組的散熱性能。最后,以某空調(diào)電池箱通風(fēng)散熱開發(fā)為例,考慮電池箱內(nèi)電池組與空氣流場的耦合模型,初步提出三種電池箱通風(fēng)散熱方案,對電池箱內(nèi)電池組進行放電數(shù)值模擬。對比分析三個方案電池組溫度場,發(fā)現(xiàn)方案三的綜合散熱性能較好。因此,選取方案三進行改進,從而達到控制箱內(nèi)電池組最高溫度和溫度分布均勻性的目的。對改進后的電池箱以200A進行放電,在整個放電過程中,電池組最高溫度為47.38℃,電池間最大溫差略低于5℃。研究結(jié)果表明,優(yōu)化后的方案三在通風(fēng)散熱和電池組溫度均勻性方面均達到要求。
[Abstract]:Li-ion batteries are widely used in electric vehicles and other power equipment due to their advantages of high voltage, high discharge current, high energy density and green environment.A large amount of heat will be produced in the process of charging and discharging of lithium-ion batteries, and the accumulation of heat will lead to a sharp rise in the battery temperature. If the heat is not dispersed in time, the charge-discharge performance, lifetime and safety performance of the battery will be reduced.Safety has always been the most concerned by consumers, and the quality of the performance is closely related to the safety of consumer property.It can be seen that the heat dissipation of the battery pack is very important in the design and production of lithium ion battery.In order to improve the thermal safety performance of Li-ion battery, it is of great engineering value to study the temperature field distribution of single cell and battery pack, and to find out the influencing factors, and to improve the active safety of power equipment such as electric vehicle.In this paper, supported by the development project of advanced energy storage equipment with the special fund of innovative scientific research team introduced by Guangdong Province, this paper combines the experimental and computational fluid dynamics technology (CFDs) to develop the single-cell soft-package battery.On the basis of analysis of heat production and heat dissipation of power battery pack module, the design and optimization of heat dissipation scheme for a certain air conditioning battery box are studied in depth.Firstly, a two-dimensional model of lithium ion monolayer electrode unit is established to calculate the distribution of electric field on the electrode during the operation of the battery.The calculation results show that the current mainly distributes near the polar ear elicitation.Secondly, some physical parameters are measured by the experimental method, and the heat production model of the soft-clad battery is established.Furthermore, the numerical simulation of the single cell was carried out by using CFD technology, and the surface temperature of the cell was collected by experiments to verify the reliability of the model.The current of 10A and 60A was used to simulate the discharge of the soft-clad battery.During the whole discharge process from 1 to 0, the maximum error of the model is less than 0.5 鈩，
本文編號：1730284
本文鏈接：http://sikaile.net/kejilunwen/dianlilw/1730284.html
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