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  1. NTU Scholars
  2. 工學院
  3. 應用力學研究所
Please use this identifier to cite or link to this item: https://scholars.lib.ntu.edu.tw/handle/123456789/627599
Title: Precise prediction of open circuit voltage of lithium ion batteries in a short time period
Authors: Zhou, Ming Ying
Zhang, Jian Bang
Ko, Chi Jyun
KUO-CHING CHEN 
Keywords: Equivalent circuit | Lithium-ion battery | Open circuit voltage | Relaxation process
Issue Date: 1-Jan-2023
Journal Volume: 553
Source: Journal of Power Sources
Abstract: 
Measuring the open circuit voltage (OCV) of a battery is quite time-consuming due to the relaxation process after the battery enters the open-circuit state. In this study, without the need of the complete voltage relaxation information, an available on-the-fly computing approach is proposed, by which the OCV at each state of charge (SOC) can be obtained from a simple first-order RC circuit model in a short period. The time constant of the RC model is evaluated by the ratio between the first and second derivatives of the experimental relaxation voltage at the earliest moment as soon as a specified voltage criterion on the real relaxation process is satisfied. With this criterion, the estimated OCV error is found to be extremely small. Experiments under three different temperatures and three types of battery state of health (SOH) are performed to verify the accuracy and robustness of the proposed approach. It is found that comparing to the traditional method of the OCV prediction at each SOC, the proposed approach can reduce the time of measuring the OCV to a few minutes (in most cases less than 6 min) with a reliable accuracy (in most cases less than 3 mV).
URI: https://scholars.lib.ntu.edu.tw/handle/123456789/627599
ISSN: 03787753
DOI: 10.1016/j.jpowsour.2022.232295
Appears in Collections:應用力學研究所

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臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

To permanently archive and promote researcher profiles and scholarly works, Library integrates the services of “NTU Repository” with “Academic Hub” to form NTU Scholars.

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開放取用是從使用者角度提升資訊取用性的社會運動,應用在學術研究上是透過將研究著作公開供使用者自由取閱,以促進學術傳播及因應期刊訂購費用逐年攀升。同時可加速研究發展、提升研究影響力,NTU Scholars即為本校的開放取用典藏(OA Archive)平台。(點選深入了解OA)

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