【摘要】：摘要：本論文結合鋰電池充電基本特性和優(yōu)化充電指標,以單體電池作為研究對象,提出一條基于極化電壓特性的優(yōu)化充電曲線,并考慮了溫度的影響。 首先研究了鋰電池在不同充電倍率、不同充電恒壓點條件下的充電時間、充電容量、恒流恒壓階段比例、內阻等因素。針對恒壓階段充電時間不易計算的問題,研究了不同倍率充電條件下恒壓轉折點的規(guī)律,修正了鋰電池CC-CV充電時間的計算公式。 重點研究了鋰電池的極化電壓特性,包括極化電壓時間常數特性、極化電壓倍率特性、極化電壓SOC區(qū)間特性、極化電壓動態(tài)特性。把時間常數分解為兩數量級與鋰離子反應過程對應；建立極化電壓倍率線性模型,提出極化倍率系數的概念；分析了極化電壓SOC區(qū)間特性的原因；發(fā)現并擬合分析了極化電壓動態(tài)特性包括滯后效應和超調效應。給出了在全SOC區(qū)間的極化電壓模型。 進而基于極化電壓模型,綜合考慮提高充電速度降低充電極化,提出以時間常數作為充電時間長度,以極化電壓作為限制的極化電壓充電曲線。在不同內阻,不同時間常數,不同端電壓因素下做了仿真,并與實驗數據對比驗證。利用充電實驗平臺設計了充電驗證實驗。 最后考慮充電過程中的溫升,對充電曲線做了補充,基于實驗數據和電池質點模型仿真分析了不同充電倍率、不同充電起始SOC的電池溫升變化。以充電溫升作為限制修正補充了充電邊界曲線。 基于極化電壓的邊界充電曲線和考慮溫升的邊界充電曲線,提出了以充電容量和充電時間作為優(yōu)化目標和以充電時間和控制電池溫升為優(yōu)化目標兩種優(yōu)化充電策略,并進行仿真分析和實驗驗證。
[Abstract]:Absrtact: based on the basic characteristics of lithium battery charging and the optimized charging index, this paper presents an optimized charging curve based on polarization voltage characteristics and takes the effect of temperature into account. The factors such as charging time, charging capacity, proportion of constant current and constant voltage, internal resistance of lithium battery under different charging rate and constant voltage point were studied. In order to solve the problem that the charging time in constant voltage stage is not easy to calculate, the rule of constant voltage turning point under different rate charging conditions is studied, and the formula for calculating CC-CV charging time of lithium battery is revised. The characteristics of polarization voltage of lithium battery, including polarization voltage time constant, polarization voltage rate, polarization voltage SOC interval characteristic and polarization voltage dynamic characteristic, are studied in detail. The time constant is decomposed into two orders of magnitude corresponding to the reaction process of lithium ion, the linear model of polarization voltage rate is established, the concept of polarization rate coefficient is put forward, and the reason of the characteristic of polarization voltage SOC region is analyzed. The dynamic characteristics of polarization voltage including hysteresis effect and overshoot effect are found and analyzed. The polarization voltage model in the whole SOC region is given. Based on the polarization voltage model, the charging curve with the time constant as the charging time and the polarization voltage as the limit is proposed, considering comprehensively increasing the charging speed and reducing the charge polarization. The simulation results are compared with the experimental data under different internal resistance, different time constants and different terminal voltage factors. The charging verification experiment is designed by using the charging experiment platform. Finally, considering the temperature rise in the charging process, the charging curve is supplemented. Based on the experimental data and the battery particle model, the temperature rise of the battery with different charging rates and different charging initiation SOC is simulated and analyzed. The charging boundary curve is supplemented by charging temperature rise as a limit correction. Based on the boundary charging curve of polarization voltage and the boundary charging curve considering temperature rise, two optimal charging strategies are proposed, which are the optimal charging capacity and the charging time, and the charging time and controlling the temperature rise of the battery. Simulation analysis and experimental verification are carried out.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM912

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本文編號：2188241