充放電模式對18650鋰電池壽命及溫升之影響

文化大學機構典藏 CCUR > 理工學院 > 工學院 > 機械工程系暨機械工程學系數位機電研究所 > 博碩士論文 > Item 987654321/44197

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題名:	充放電模式對18650鋰電池壽命及溫升之影響 Effects of Charge-discharge Mode on the Life and Temperature Rise of 18650 Lithium Battery
作者:	張謨宇 (Zhang,Mo-Yu)
貢獻者:	機械工程學系數位機電碩士班
關鍵詞:	脈衝充電循環壽命電池溫升 Cycle-life Temperature rise Lithium battery Pulse charge
日期:	2018
上傳時間:	2019-05-17 12:40:11 (UTC+8)
摘要:	隨著全球科技的日益月新，3C產品逐漸變成日常生活所需，因此3C產品內之電池亦越來越常見於日常生活中。電池的開發也朝著更輕薄、更具續航力之方面邁進。鋰離子電池的主要優點為高開環電壓、操作範圍廣、放電壓穩定、能量密度大、具可充電性及對環境污染小等。正當鋰電池快速發展且牽動能源世代的同時，對鋰電池的需求成長促使各界研究人員針對鋰電池循環壽命與安全性進行探討。本研究使用4個不同的充電模式對鋰電池進行充放電的實驗，每個充電模式進行300次充放電循環，主要是探討單顆鋰電池使用不同的充電方法下的充電波形、電池循環壽命與電池暫態溫度變化。實驗結果顯示，在不同充電模式下，電池電量狀態皆會隨著循環次數增加而下降。在充電過程中適當之間歇性休息或負脈衝能提供電池散熱時間及降低電解質濃度極化，故能降低電池溫升及提升200次循環前之電池壽命，但過度頻繁的休息或負脈衝充電可能加速電極結構崩塌或材料老化，導致其內阻上升速率提高、溫升值上升速率加快，也因此高頻脈衝充電及負脈衝充電於200次循環後，會導致電池電量狀態之加速惡化。另外，四種充電法在電池充至SOC 70%的時間皆隨著循環次數而增長，這是因為電池內阻隨循環次數增加而增加，因此第一階段之充電(定電流或脈衝電流)時間縮短、定電壓充電時間拉長所導致。 With the global progress of technology, 3C products become essential in human society. Therefore, the batteries in 3C products become more and more important in our daily life. The development of batteries is moving in the direction of lighter weight and longer durability. The advantages of Li batteries include high open circuit voltage, wide operating range, stable voltage output, high energy density, rechargeability and being eco-friendly. As the development of lithium battery grows fast and impacts this energy generation, the demand for lithium battery urges that researches study the cycle life and safety of the lithium battery. In this work, the charge-discharge of Li batteries was carried out and lasted for 300 cycles with four different charge modes. The major research subject is to study the waveform, cycle-life, and transient temperature rise of a single Li battery cell under different charge modes. The experimental results show that the state of charge of the Li batteries with different charge modes decreases with an increase in the cycle number. During a charge process, proper intermittent rest or negative pulse provides intermittent duration of cooling and reduces the concentration polarization in the electrolyte, leading to a drop of temperature rise of the Li battery and an elevation of battery cycle-life before 200 cycles. However, an over-frequent rest or negative pulse may accelerate the structure collapse or material degradation of the electrode in the Li battery, causing a rising growth rate of internal resistance and an elevated expansion rate of temperature rise. Thus, the highly frequent pulse charge and negative pulse charge may result in an increase in the deterioration level of the battery after 200 cycles. Moreover, the charging time for 70% of the state of charge grows with the cycle number. This is because the internal resistance of the Li battery increases with the cycle number, resulting in shortening the charging time of the first stage charge (constant current charge or pulse charge) and prolonging the charging time of the constant voltage stage.
顯示於類別:	[機械工程系暨機械工程學系數位機電研究所] 博碩士論文

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