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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal behavior analyses of stacked prismatic LiCoO_2 lithium-ion batteries during oven tests
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Thermal behavior analyses of stacked prismatic LiCoO_2 lithium-ion batteries during oven tests

机译：方形棱柱形LiCoO_2锂离子电池在烤箱测试期间的热行为分析

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摘要

Oven tests of prismatic graphite/LiPF_6/LiCoO_2 batteries with stacked electrode design are numerically studied. Simulation results enable comprehensive analyses to thermal behaviors of the battery. It is found that oven temperature, tab arrangement, and heat release condition interact with each other when determining the thermal behaviors of the battery. Under normal natural convective heat release condition, the oven test of oven temperature higher than around 190 ℃ may trigger strong exothermic reactions, leading to fast heat accumulation inside the battery and rapid temperature rise. For a battery exposed to high temperature ambient, improving heat release condition may facilitate the occurrence of exothermic reactions and thus accelerate heat generation inside the battery. Tab arrangement has effects on heat generation and transport inside the battery and affects the uniformity of temperature distribution. For a cell inside the battery, heat generation rate during oven thermal abuse process shows dependence on the location of the cell. Both the location-dependent heat generation rate itself and the relative magnitude between heat generation rates at different locations change with time and can result in large temperature non-uniformity between cells. These findings are helpful for proper thermal design and thermal management design of practical large capacity batteries.
机译：数值研究了具有堆叠电极设计的方形石墨/ LiPF_6 / LiCoO_2电池的烤箱测试。仿真结果可以对电池的热行为进行全面分析。发现，在确定电池的热行为时，烤箱温度，突舌排列和放热条件会相互影响。在正常的自然对流放热条件下，烤箱温度高于190℃的烤箱测试可能会引发强烈的放热反应，从而导致电池内部快速蓄热并迅速升温。对于暴露于高温环境下的电池，改善散热条件可能会促进放热反应的发生，从而加速电池内部的发热。接片的布置会影响电池内部的热量产生和传输，并影响温度分布的均匀性。对于电池内部的电池，烤箱热滥用过程中的发热速率显示出对电池位置的依赖性。与位置有关的生热速率本身以及在不同位置的生热速率之间的相对大小都随时间变化，并且可能导致电池之间的温度不均匀性很大。这些发现有助于实用的大容量电池的正确热设计和热管理设计。

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