Thermal hazard assessment for three C rates for a Li-polymer battery by using vent sizing package 2

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• 作者：Yi-Hong Chung ; Wun-Cheng Jhang…
• 关键词：C rate ; Cycles ; Explosion and fire phenomena ; Li ; polymer battery ; Thermal runaway mechanisms ; Thermal stability
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：127
• 期：1
• 页码：809-817
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
• 出版者：Springer Netherlands
• ISSN：1588-2926
• 卷排序：127

文摘

The Li-polymer battery (LPB) offers numerous advantages such as long cycle life and thinner volume. A major challenge is supplying energy to the battery with higher efficiency and superior thermal safety. In this study, LPB samples with different charging rates (1C, 3C, and 5C) were prepared under specific conditions for withstanding 100 cycles of the aging test, and their temperature variation was recorded at different times. Vent sizing package 2 and a customized stainless-steel test cell were used for determining the thermal hazard characteristics, such as apparent exothermic onset temperature (T₀), self-heating rate (dT dt−1), pressure rise rate (dP dt−1), pressure–temperature profiles, maximum temperature (T_max), and maximum pressure (P_max), to reveal the thermal runaway mechanisms. We investigated the relationship between the charge/discharge rate and thermal stability for the LPB samples. In the discharge process, operation at a higher C rate was associated with a higher-temperature rise. The results revealed that the batteries preparation with higher C rate (i.e., 5C) had the most unstable properties. During the runaway reaction, the lowest T₀, T_max, and P_max values were 133.0 °C, 530.0 °C, and 910.1 kPa, respectively. Compared with the batteries exterior, the 5C tests exhibited explosion and fire hazards. These results suggest that the 5C charging rate is unsuitable for batteries, whereas the 1C and 3C rates are appropriate in terms of thermal stability.