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標題: | 一種簡易且快速估算鋰離子電池開路電壓的方法 A simple and rapid method for estimating the open circuit voltage of lithium-ion batteries |
作者: | Ming-Yan Zhou 周明彥 |
指導教授: | 陳國慶(Kuo-Ching Chen) |
關鍵字: | 鋰離子電池,開路電壓,一階等效電路模型,弛豫電壓,時間常數, Lithium-ion battery,Open circuit voltage,First-order RC model,Relaxation voltage,Time constant, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 近年來隨著電動汽車(EV)的普及化,鋰離子電池的需求量也逐漸增加。其中,開路電壓是鋰離子電池的重要特性之一,該特性被廣泛應用於電池管理系統(BMS)中,例如,用於估計充電狀態(SoC)或健康狀態(SoH)。然而,由於極化效應,測量電池的OCV非常耗費時間,這個問題導致OCV在實際應用上仍然存在很多限制。在本研究中,我們提出了一種增加 OCV 量測效率的方法。基於一階RC模型,我們重新描述了極化電壓的衰減過程。藉由重新描述衰減過程,我們不需要完全擬合弛豫電壓也可獲取OCV值。此外,等效電路模型的時間常數可以通過弛豫電壓的一階和二階導數之比例確定,其他模型參數可以在實驗過程中直接測量,因此,所提出的方法具有在線估計OCV的能力。最後,將電池置於不同溫度下並對不同 SoH 的電池進行測試以驗證所提出方法的準確性和可靠性。結果表明,與傳統方法相比,所提出的方法可以將OCV估計時間縮短到幾分鐘(大多數情況下小於6分鐘),並且具有可靠的準確度(大多數估計誤差小於3mV)。 With the popularity of electric vehicles (EV), the requirement of lithium-ion batteries is also increasing. Open circuit voltage is one of the important characteristics of lithium-ion batteries, and this characteristic is widely used in battery management system (BMS) to estimate state-of-charge (SoC) or state-of-health (SoH). However, it is quite time-consuming to measure OCV because of polarization effect, and this problem caused that OCV still has many limitations in the application. In this study, we propose a method to improve the measurement efficiency of OCV. Based on a first-order RC model, we restate the decay process of the polarization voltage, by restating the decay process, there is no need to fully fit the relaxation voltage. The time constant of the model can be determined by the ratio between first and second derivatives of the relaxation voltage, and other model parameters can be directly measured during the experiment. Therefore, the proposed method has the ability to estimate OCV online. Experiments are developed to verify the accuracy and robustness of the proposed method, conducted on different temperatures and with different SoHs. The results show that comparing to the traditional method, the proposed method can reduce the time to a few minutes (most of cases less than 6 mins) to estimate OCV with a reliable accuracy (most estimation errors are less than 3mV). |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/86410 |
DOI: | 10.6342/NTU202202649 |
全文授權: | 同意授權(全球公開) |
電子全文公開日期: | 2027-08-22 |
顯示於系所單位: | 應用力學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
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U0001-2208202214511400.pdf 此日期後於網路公開 2027-08-22 | 5.55 MB | Adobe PDF |
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