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標題: | 調控分支電流以延緩並聯鋰離子電池組老化的探討 On the lifespan extension for Lithium-ion battery packs by regulating the branch current |
作者: | Yi-Ren Guo 郭逸仁 |
指導教授: | 陳國慶(Kuo-Ching Chen) |
關鍵字: | 鋰離子電池,電池組,分支電流,電池老化,電池內阻, Lithium-ion battery,battery pack,branch current,aging,internal resistance, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 全球石化原料的日益枯竭以及環保意識的抬頭,促使綠能科技的蓬勃發展,目前對於儲能裝置之需求也迅速增加。作為最具發展潛力之離離子電池的相關研究,為目前一項非常熱門且具前瞻性之研究課題。儲能裝置須具備可儲存大量能量之特性,主要將鋰離子電池以串並聯的方式組成電池組,作為儲存能量的裝置,故鋰離子電池組為一個非常重要的研究課題。
但是如同人類社會一般,群體總是比單體更為複雜,群體之中各個個體的些微差異,容易使整體發生不好的效應,此現象亦出現於電池組的使用上。目前已知之研究顯示,並聯電池組會因為電池間存在的製造誤差,發生分支電流分歧的現象,使得並聯電池組老化速度增加,導致其使用壽命降低。為此,並聯電池組之各分支電流分配為目前一項倍受矚目的研究課題。不幸地,雖然已知電池間存在的製造誤差會造成分支電流產生差異,但是關於其中的詳細原因尚未有一個明確且具物理意義之闡述與說明。且不可避免地,對於電池組的發展與研究而言,清楚的了解電池組分支電流分配為一勢在必行的研究課題。 因此,本論文將針對並聯電池組之行為進行解析,揭開並聯電池組中分支電流分配的秘密。並以此解析方式提出一套方法,控制電池組中分支電流的分配情況,使得分支電流間的差異降低,進而達到延緩並聯電池組老化速度的目標。最後發展出一套簡單且準確的模擬方式,得知電池組中分支電流的分配狀況,藉此達到提前預知分支電流大小的可能。 本論文提出的分支電流控制方式,可以有效減緩並聯電池組的老化速度。而最後提出的分支電流分配模擬分析,可以使電池組往使用壽命延長、安全性提升以及增加使用效率的研究方向發展。在日後電池組的研究中,將可以透過了解並聯電池組的行為,進行更深入的探索,並對儲能裝置的蓬勃發展產生極大的貢獻。 Recently, due to the growing depletion of petrochemical materials and the rise of environmental awareness have prompted environmental energy to flourish, and result in the demand for energy storage devices has also rapidly increased. The energy storage devices should have the characteristics that can store a large amount of energy, so we usually use lithium-ion battery in series and parallel as the energy storing device. According to known studies show that parallel battery packs can cause branch current different due to manufacturing errors between the batteries, which increases the aging speed of the parallel battery packs and leads to a decrease in the lifespan of the battery packs. However, the distribution of the branch currents in pack battery are unknown. For the development of the pack battery, the research of the distribution of branch current is unavoidable. Therefore, this paper will analyze the behavior and uncover the distribution of branch current in parallel battery packs. By this way, a method which can control the distribution of branch current in battery pack had been proposed. This method can reduce the differences between the branch currents, and make the goal of delaying the aging speed of battery packs achieved. Finally, a simple simulation method was developed to know the distribution of the branch current in the battery pack, and making the prediction of branch currents in battery pack to be possibility. The branch current control method proposed in this paper can effectively reduce the aging speed of battery packs. This simulation analysis of the branch current has made significant contributions to the three aspects of the battery pack, including extended lifespan, improved safety and efficiency. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79078 |
DOI: | 10.6342/NTU201803018 |
全文授權: | 有償授權 |
顯示於系所單位: | 應用力學研究所 |
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