本文選題：鋰離子動力電池 + 健康狀態(tài)(SOH)�。� 參考：《合肥工業(yè)大學(xué)》2016年碩士論文

【摘要】：受環(huán)境污染和能源危機(jī)的影響,新能源汽車被列為國家重點扶持產(chǎn)業(yè),未來新能源汽車的占有率會逐年遞增,鋰離子電池的性能優(yōu)勢使其成為純電動車和混合動力汽車的動力電池首選。由于鋰離子電池的固有特性導(dǎo)致電池SOC和SOH等狀態(tài)參數(shù)很難直接被測量,所以電池模型和電池狀態(tài)參數(shù)的研究一直是行業(yè)的熱點。電池管理系統(tǒng)作為新能源汽車的重要組成部分是電池安全工作的保障,也是電池狀態(tài)參數(shù)估算的設(shè)備平臺,如何在電池管理系統(tǒng)中對電池狀態(tài)參數(shù)準(zhǔn)確估算目前仍是個技術(shù)難題。本文將在電池管理與測試系統(tǒng)平臺的搭建基礎(chǔ)上對動力電池可用容量和SOH的估算方法進(jìn)行研究。首先研究鋰離子電池的工作原理及電池結(jié)構(gòu)特征,分析電池的電壓特性、電池的溫度特性、電池的內(nèi)阻特性和電池的循環(huán)特性,并研究鋰離子電池在使用過程中導(dǎo)致電池容量衰減的幾種主要因素。其次分析幾種常用等效電路模型的特征及優(yōu)缺點,選擇二階RC等效電路模型模擬鋰離子電池的工作特性,運用遞推RLS算法對電池模型參數(shù)辨識估計,并驗證電池模型實用性,為后期的可用容量估算獲得了參數(shù)估算值。然后研究幾種常用的電池可用容量估算方法,基于所選用的電池模型利用擴(kuò)展卡爾曼濾波法對電池SOC進(jìn)行估算,將獲得的SOC值和庫倫計數(shù)法所得到的SOC值進(jìn)行比對,綜合選取當(dāng)前時刻的SOC值,最后利用SOC值和可用容量的關(guān)系得到電池可用容量和電池SOH值。最后搭建實驗平臺,驗證電池模型的實用性,通過單體電池和成組電池的實驗結(jié)果對所提出的方法進(jìn)行驗證,分析實驗結(jié)果可看出所選的估算方法在精度方面具有很好的實驗效果。
[Abstract]:Under the influence of environmental pollution and energy crisis, new energy vehicles are listed as the key industries supported by the state. In the future, the share of new energy vehicles will increase year by year. The performance advantage of lithium ion battery makes it the first choice of power battery for pure electric vehicle and hybrid vehicle. Due to the inherent characteristics of Li-ion battery, it is difficult to measure the state parameters such as SOC and SOH directly, so the research of battery model and battery state parameters has been a hot spot in the industry. As an important part of new energy vehicle, battery management system is the guarantee of battery safety and the equipment platform for estimating battery state parameters. How to accurately estimate battery state parameters in battery management system is still a technical problem. In this paper, based on the platform of battery management and test system, the available capacity of power battery and the estimation method of SOH are studied. Firstly, the principle and structure of Li-ion battery are studied. The voltage characteristic, temperature characteristic, internal resistance characteristic and cycle characteristic of battery are analyzed. Several main factors that lead to the battery capacity attenuation during the use of lithium ion battery are studied. Secondly, the characteristics, advantages and disadvantages of several commonly used equivalent circuit models are analyzed. The second order RC equivalent circuit model is selected to simulate the working characteristics of lithium ion battery. The recursive RLS algorithm is used to estimate the parameters of the battery model, and the practicability of the battery model is verified. The parameter estimation value is obtained for the later available capacity estimation. Then several commonly used methods for estimating the available capacity of the battery are studied. Based on the selected battery model, the SOC of the battery is estimated by using the extended Kalman filter, and the SOC value obtained by the Coulomb counting method is compared with that obtained by the Coulomb counting method. Finally, the relationship between SOC value and available capacity is used to obtain the available battery capacity and SOH value. Finally, an experimental platform is built to verify the practicability of the battery model, and the proposed method is verified by the experimental results of single cell and group battery. By analyzing the experimental results, we can see that the proposed estimation method has a good experimental effect in terms of accuracy.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U469.72

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本文編號：2108062